view src/ex_cmds.c @ 2894:fe9c7da98b5e v7.3.220

updated for version 7.3.220 Problem: Python 3: vim.error is a 'str' instead of an 'Exception' object, so 'except' or 'raise' it causes a 'SystemError' exception. Buffer objects do not support slice assignment. When exchanging text between Vim and Python, multibyte texts become gabage or cause Unicode Expceptions, etc. 'py3file' tries to read in the file as Unicode, sometimes causes UnicodeDecodeException Solution: Fix the problems. (lilydjwg)
author Bram Moolenaar <bram@vim.org>
date Sun, 19 Jun 2011 00:27:51 +0200
parents d84a564f28c9
children bf283e37792b
line wrap: on
line source

/* vi:set ts=8 sts=4 sw=4:
 *
 * VIM - Vi IMproved	by Bram Moolenaar
 *
 * Do ":help uganda"  in Vim to read copying and usage conditions.
 * Do ":help credits" in Vim to see a list of people who contributed.
 * See README.txt for an overview of the Vim source code.
 */

/*
 * ex_cmds.c: some functions for command line commands
 */

#include "vim.h"
#include "version.h"

#ifdef FEAT_EX_EXTRA
static int linelen __ARGS((int *has_tab));
#endif
static void do_filter __ARGS((linenr_T line1, linenr_T line2, exarg_T *eap, char_u *cmd, int do_in, int do_out));
#ifdef FEAT_VIMINFO
static char_u *viminfo_filename __ARGS((char_u	*));
static void do_viminfo __ARGS((FILE *fp_in, FILE *fp_out, int flags));
static int viminfo_encoding __ARGS((vir_T *virp));
static int read_viminfo_up_to_marks __ARGS((vir_T *virp, int forceit, int writing));
#endif

static int check_overwrite __ARGS((exarg_T *eap, buf_T *buf, char_u *fname, char_u *ffname, int other));
static int check_readonly __ARGS((int *forceit, buf_T *buf));
#ifdef FEAT_AUTOCMD
static void delbuf_msg __ARGS((char_u *name));
#endif
static int
#ifdef __BORLANDC__
    _RTLENTRYF
#endif
	help_compare __ARGS((const void *s1, const void *s2));

/*
 * ":ascii" and "ga".
 */
    void
do_ascii(eap)
    exarg_T	*eap UNUSED;
{
    int		c;
    int		cval;
    char	buf1[20];
    char	buf2[20];
    char_u	buf3[7];
#ifdef FEAT_MBYTE
    int		cc[MAX_MCO];
    int		ci = 0;
    int		len;

    if (enc_utf8)
	c = utfc_ptr2char(ml_get_cursor(), cc);
    else
#endif
	c = gchar_cursor();
    if (c == NUL)
    {
	MSG("NUL");
	return;
    }

#ifdef FEAT_MBYTE
    IObuff[0] = NUL;
    if (!has_mbyte || (enc_dbcs != 0 && c < 0x100) || c < 0x80)
#endif
    {
	if (c == NL)	    /* NUL is stored as NL */
	    c = NUL;
	if (c == CAR && get_fileformat(curbuf) == EOL_MAC)
	    cval = NL;	    /* NL is stored as CR */
	else
	    cval = c;
	if (vim_isprintc_strict(c) && (c < ' '
#ifndef EBCDIC
		    || c > '~'
#endif
			       ))
	{
	    transchar_nonprint(buf3, c);
	    vim_snprintf(buf1, sizeof(buf1), "  <%s>", (char *)buf3);
	}
	else
	    buf1[0] = NUL;
#ifndef EBCDIC
	if (c >= 0x80)
	    vim_snprintf(buf2, sizeof(buf2), "  <M-%s>",
						 (char *)transchar(c & 0x7f));
	else
#endif
	    buf2[0] = NUL;
	vim_snprintf((char *)IObuff, IOSIZE,
		_("<%s>%s%s  %d,  Hex %02x,  Octal %03o"),
				  transchar(c), buf1, buf2, cval, cval, cval);
#ifdef FEAT_MBYTE
	if (enc_utf8)
	    c = cc[ci++];
	else
	    c = 0;
#endif
    }

#ifdef FEAT_MBYTE
    /* Repeat for combining characters. */
    while (has_mbyte && (c >= 0x100 || (enc_utf8 && c >= 0x80)))
    {
	len = (int)STRLEN(IObuff);
	/* This assumes every multi-byte char is printable... */
	if (len > 0)
	    IObuff[len++] = ' ';
	IObuff[len++] = '<';
	if (enc_utf8 && utf_iscomposing(c)
# ifdef USE_GUI
		&& !gui.in_use
# endif
		)
	    IObuff[len++] = ' '; /* draw composing char on top of a space */
	len += (*mb_char2bytes)(c, IObuff + len);
	vim_snprintf((char *)IObuff + len, IOSIZE - len,
			c < 0x10000 ? _("> %d, Hex %04x, Octal %o")
				    : _("> %d, Hex %08x, Octal %o"), c, c, c);
	if (ci == MAX_MCO)
	    break;
	if (enc_utf8)
	    c = cc[ci++];
	else
	    c = 0;
    }
#endif

    msg(IObuff);
}

#if defined(FEAT_EX_EXTRA) || defined(PROTO)
/*
 * ":left", ":center" and ":right": align text.
 */
    void
ex_align(eap)
    exarg_T	*eap;
{
    pos_T	save_curpos;
    int		len;
    int		indent = 0;
    int		new_indent;
    int		has_tab;
    int		width;

#ifdef FEAT_RIGHTLEFT
    if (curwin->w_p_rl)
    {
	/* switch left and right aligning */
	if (eap->cmdidx == CMD_right)
	    eap->cmdidx = CMD_left;
	else if (eap->cmdidx == CMD_left)
	    eap->cmdidx = CMD_right;
    }
#endif

    width = atoi((char *)eap->arg);
    save_curpos = curwin->w_cursor;
    if (eap->cmdidx == CMD_left)    /* width is used for new indent */
    {
	if (width >= 0)
	    indent = width;
    }
    else
    {
	/*
	 * if 'textwidth' set, use it
	 * else if 'wrapmargin' set, use it
	 * if invalid value, use 80
	 */
	if (width <= 0)
	    width = curbuf->b_p_tw;
	if (width == 0 && curbuf->b_p_wm > 0)
	    width = W_WIDTH(curwin) - curbuf->b_p_wm;
	if (width <= 0)
	    width = 80;
    }

    if (u_save((linenr_T)(eap->line1 - 1), (linenr_T)(eap->line2 + 1)) == FAIL)
	return;

    for (curwin->w_cursor.lnum = eap->line1;
		 curwin->w_cursor.lnum <= eap->line2; ++curwin->w_cursor.lnum)
    {
	if (eap->cmdidx == CMD_left)		/* left align */
	    new_indent = indent;
	else
	{
	    has_tab = FALSE;	/* avoid uninit warnings */
	    len = linelen(eap->cmdidx == CMD_right ? &has_tab
						   : NULL) - get_indent();

	    if (len <= 0)			/* skip blank lines */
		continue;

	    if (eap->cmdidx == CMD_center)
		new_indent = (width - len) / 2;
	    else
	    {
		new_indent = width - len;	/* right align */

		/*
		 * Make sure that embedded TABs don't make the text go too far
		 * to the right.
		 */
		if (has_tab)
		    while (new_indent > 0)
		    {
			(void)set_indent(new_indent, 0);
			if (linelen(NULL) <= width)
			{
			    /*
			     * Now try to move the line as much as possible to
			     * the right.  Stop when it moves too far.
			     */
			    do
				(void)set_indent(++new_indent, 0);
			    while (linelen(NULL) <= width);
			    --new_indent;
			    break;
			}
			--new_indent;
		    }
	    }
	}
	if (new_indent < 0)
	    new_indent = 0;
	(void)set_indent(new_indent, 0);		/* set indent */
    }
    changed_lines(eap->line1, 0, eap->line2 + 1, 0L);
    curwin->w_cursor = save_curpos;
    beginline(BL_WHITE | BL_FIX);
}

/*
 * Get the length of the current line, excluding trailing white space.
 */
    static int
linelen(has_tab)
    int	    *has_tab;
{
    char_u  *line;
    char_u  *first;
    char_u  *last;
    int	    save;
    int	    len;

    /* find the first non-blank character */
    line = ml_get_curline();
    first = skipwhite(line);

    /* find the character after the last non-blank character */
    for (last = first + STRLEN(first);
				last > first && vim_iswhite(last[-1]); --last)
	;
    save = *last;
    *last = NUL;
    len = linetabsize(line);		/* get line length */
    if (has_tab != NULL)		/* check for embedded TAB */
	*has_tab = (vim_strrchr(first, TAB) != NULL);
    *last = save;

    return len;
}

/* Buffer for two lines used during sorting.  They are allocated to
 * contain the longest line being sorted. */
static char_u	*sortbuf1;
static char_u	*sortbuf2;

static int	sort_ic;		/* ignore case */
static int	sort_nr;		/* sort on number */
static int	sort_rx;		/* sort on regex instead of skipping it */

static int	sort_abort;		/* flag to indicate if sorting has been interrupted */

/* Struct to store info to be sorted. */
typedef struct
{
    linenr_T	lnum;			/* line number */
    long	start_col_nr;		/* starting column number or number */
    long	end_col_nr;		/* ending column number */
} sorti_T;

static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
sort_compare __ARGS((const void *s1, const void *s2));

    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
sort_compare(s1, s2)
    const void	*s1;
    const void	*s2;
{
    sorti_T	l1 = *(sorti_T *)s1;
    sorti_T	l2 = *(sorti_T *)s2;
    int		result = 0;

    /* If the user interrupts, there's no way to stop qsort() immediately, but
     * if we return 0 every time, qsort will assume it's done sorting and
     * exit. */
    if (sort_abort)
	return 0;
    fast_breakcheck();
    if (got_int)
	sort_abort = TRUE;

    /* When sorting numbers "start_col_nr" is the number, not the column
     * number. */
    if (sort_nr)
	result = l1.start_col_nr == l2.start_col_nr ? 0
				 : l1.start_col_nr > l2.start_col_nr ? 1 : -1;
    else
    {
	/* We need to copy one line into "sortbuf1", because there is no
	 * guarantee that the first pointer becomes invalid when obtaining the
	 * second one. */
	STRNCPY(sortbuf1, ml_get(l1.lnum) + l1.start_col_nr,
					 l1.end_col_nr - l1.start_col_nr + 1);
	sortbuf1[l1.end_col_nr - l1.start_col_nr] = 0;
	STRNCPY(sortbuf2, ml_get(l2.lnum) + l2.start_col_nr,
					 l2.end_col_nr - l2.start_col_nr + 1);
	sortbuf2[l2.end_col_nr - l2.start_col_nr] = 0;

	result = sort_ic ? STRICMP(sortbuf1, sortbuf2)
						 : STRCMP(sortbuf1, sortbuf2);
    }

    /* If two lines have the same value, preserve the original line order. */
    if (result == 0)
	return (int)(l1.lnum - l2.lnum);
    return result;
}

/*
 * ":sort".
 */
    void
ex_sort(eap)
    exarg_T	*eap;
{
    regmatch_T	regmatch;
    int		len;
    linenr_T	lnum;
    long	maxlen = 0;
    sorti_T	*nrs;
    size_t	count = (size_t)(eap->line2 - eap->line1 + 1);
    size_t	i;
    char_u	*p;
    char_u	*s;
    char_u	*s2;
    char_u	c;			/* temporary character storage */
    int		unique = FALSE;
    long	deleted;
    colnr_T	start_col;
    colnr_T	end_col;
    int		sort_oct;		/* sort on octal number */
    int		sort_hex;		/* sort on hex number */

    /* Sorting one line is really quick! */
    if (count <= 1)
	return;

    if (u_save((linenr_T)(eap->line1 - 1), (linenr_T)(eap->line2 + 1)) == FAIL)
	return;
    sortbuf1 = NULL;
    sortbuf2 = NULL;
    regmatch.regprog = NULL;
    nrs = (sorti_T *)lalloc((long_u)(count * sizeof(sorti_T)), TRUE);
    if (nrs == NULL)
	goto sortend;

    sort_abort = sort_ic = sort_rx = sort_nr = sort_oct = sort_hex = 0;

    for (p = eap->arg; *p != NUL; ++p)
    {
	if (vim_iswhite(*p))
	    ;
	else if (*p == 'i')
	    sort_ic = TRUE;
	else if (*p == 'r')
	    sort_rx = TRUE;
	else if (*p == 'n')
	    sort_nr = 2;
	else if (*p == 'o')
	    sort_oct = 2;
	else if (*p == 'x')
	    sort_hex = 2;
	else if (*p == 'u')
	    unique = TRUE;
	else if (*p == '"')	/* comment start */
	    break;
	else if (check_nextcmd(p) != NULL)
	{
	    eap->nextcmd = check_nextcmd(p);
	    break;
	}
	else if (!ASCII_ISALPHA(*p) && regmatch.regprog == NULL)
	{
	    s = skip_regexp(p + 1, *p, TRUE, NULL);
	    if (*s != *p)
	    {
		EMSG(_(e_invalpat));
		goto sortend;
	    }
	    *s = NUL;
	    /* Use last search pattern if sort pattern is empty. */
	    if (s == p + 1 && last_search_pat() != NULL)
		regmatch.regprog = vim_regcomp(last_search_pat(), RE_MAGIC);
	    else
		regmatch.regprog = vim_regcomp(p + 1, RE_MAGIC);
	    if (regmatch.regprog == NULL)
		goto sortend;
	    p = s;		/* continue after the regexp */
	    regmatch.rm_ic = p_ic;
	}
	else
	{
	    EMSG2(_(e_invarg2), p);
	    goto sortend;
	}
    }

    /* Can only have one of 'n', 'o' and 'x'. */
    if (sort_nr + sort_oct + sort_hex > 2)
    {
	EMSG(_(e_invarg));
	goto sortend;
    }

    /* From here on "sort_nr" is used as a flag for any number sorting. */
    sort_nr += sort_oct + sort_hex;

    /*
     * Make an array with all line numbers.  This avoids having to copy all
     * the lines into allocated memory.
     * When sorting on strings "start_col_nr" is the offset in the line, for
     * numbers sorting it's the number to sort on.  This means the pattern
     * matching and number conversion only has to be done once per line.
     * Also get the longest line length for allocating "sortbuf".
     */
    for (lnum = eap->line1; lnum <= eap->line2; ++lnum)
    {
	s = ml_get(lnum);
	len = (int)STRLEN(s);
	if (maxlen < len)
	    maxlen = len;

	start_col = 0;
	end_col = len;
	if (regmatch.regprog != NULL && vim_regexec(&regmatch, s, 0))
	{
	    if (sort_rx)
	    {
		start_col = (colnr_T)(regmatch.startp[0] - s);
		end_col = (colnr_T)(regmatch.endp[0] - s);
	    }
	    else
		start_col = (colnr_T)(regmatch.endp[0] - s);
	}
	else
	    if (regmatch.regprog != NULL)
		end_col = 0;

	if (sort_nr)
	{
	    /* Make sure vim_str2nr doesn't read any digits past the end
	     * of the match, by temporarily terminating the string there */
	    s2 = s + end_col;
	    c = *s2;
	    *s2 = NUL;
	    /* Sorting on number: Store the number itself. */
	    p = s + start_col;
	    if (sort_hex)
		s = skiptohex(p);
	    else
		s = skiptodigit(p);
	    if (s > p && s[-1] == '-')
		--s;  /* include preceding negative sign */
	    if (*s == NUL)
		/* empty line should sort before any number */
		nrs[lnum - eap->line1].start_col_nr = -MAXLNUM;
	    else
		vim_str2nr(s, NULL, NULL, sort_oct, sort_hex,
				  &nrs[lnum - eap->line1].start_col_nr, NULL);
	    *s2 = c;
	}
	else
	{
	    /* Store the column to sort at. */
	    nrs[lnum - eap->line1].start_col_nr = start_col;
	    nrs[lnum - eap->line1].end_col_nr = end_col;
	}

	nrs[lnum - eap->line1].lnum = lnum;

	if (regmatch.regprog != NULL)
	    fast_breakcheck();
	if (got_int)
	    goto sortend;
    }

    /* Allocate a buffer that can hold the longest line. */
    sortbuf1 = alloc((unsigned)maxlen + 1);
    if (sortbuf1 == NULL)
	goto sortend;
    sortbuf2 = alloc((unsigned)maxlen + 1);
    if (sortbuf2 == NULL)
	goto sortend;

    /* Sort the array of line numbers.  Note: can't be interrupted! */
    qsort((void *)nrs, count, sizeof(sorti_T), sort_compare);

    if (sort_abort)
	goto sortend;

    /* Insert the lines in the sorted order below the last one. */
    lnum = eap->line2;
    for (i = 0; i < count; ++i)
    {
	s = ml_get(nrs[eap->forceit ? count - i - 1 : i].lnum);
	if (!unique || i == 0
		|| (sort_ic ? STRICMP(s, sortbuf1) : STRCMP(s, sortbuf1)) != 0)
	{
	    if (ml_append(lnum++, s, (colnr_T)0, FALSE) == FAIL)
		break;
	    if (unique)
		STRCPY(sortbuf1, s);
	}
	fast_breakcheck();
	if (got_int)
	    goto sortend;
    }

    /* delete the original lines if appending worked */
    if (i == count)
	for (i = 0; i < count; ++i)
	    ml_delete(eap->line1, FALSE);
    else
	count = 0;

    /* Adjust marks for deleted (or added) lines and prepare for displaying. */
    deleted = (long)(count - (lnum - eap->line2));
    if (deleted > 0)
	mark_adjust(eap->line2 - deleted, eap->line2, (long)MAXLNUM, -deleted);
    else if (deleted < 0)
	mark_adjust(eap->line2, MAXLNUM, -deleted, 0L);
    changed_lines(eap->line1, 0, eap->line2 + 1, -deleted);

    curwin->w_cursor.lnum = eap->line1;
    beginline(BL_WHITE | BL_FIX);

sortend:
    vim_free(nrs);
    vim_free(sortbuf1);
    vim_free(sortbuf2);
    vim_free(regmatch.regprog);
    if (got_int)
	EMSG(_(e_interr));
}

/*
 * ":retab".
 */
    void
ex_retab(eap)
    exarg_T	*eap;
{
    linenr_T	lnum;
    int		got_tab = FALSE;
    long	num_spaces = 0;
    long	num_tabs;
    long	len;
    long	col;
    long	vcol;
    long	start_col = 0;		/* For start of white-space string */
    long	start_vcol = 0;		/* For start of white-space string */
    int		temp;
    long	old_len;
    char_u	*ptr;
    char_u	*new_line = (char_u *)1;    /* init to non-NULL */
    int		did_undo;		/* called u_save for current line */
    int		new_ts;
    int		save_list;
    linenr_T	first_line = 0;		/* first changed line */
    linenr_T	last_line = 0;		/* last changed line */

    save_list = curwin->w_p_list;
    curwin->w_p_list = 0;	    /* don't want list mode here */

    new_ts = getdigits(&(eap->arg));
    if (new_ts < 0)
    {
	EMSG(_(e_positive));
	return;
    }
    if (new_ts == 0)
	new_ts = curbuf->b_p_ts;
    for (lnum = eap->line1; !got_int && lnum <= eap->line2; ++lnum)
    {
	ptr = ml_get(lnum);
	col = 0;
	vcol = 0;
	did_undo = FALSE;
	for (;;)
	{
	    if (vim_iswhite(ptr[col]))
	    {
		if (!got_tab && num_spaces == 0)
		{
		    /* First consecutive white-space */
		    start_vcol = vcol;
		    start_col = col;
		}
		if (ptr[col] == ' ')
		    num_spaces++;
		else
		    got_tab = TRUE;
	    }
	    else
	    {
		if (got_tab || (eap->forceit && num_spaces > 1))
		{
		    /* Retabulate this string of white-space */

		    /* len is virtual length of white string */
		    len = num_spaces = vcol - start_vcol;
		    num_tabs = 0;
		    if (!curbuf->b_p_et)
		    {
			temp = new_ts - (start_vcol % new_ts);
			if (num_spaces >= temp)
			{
			    num_spaces -= temp;
			    num_tabs++;
			}
			num_tabs += num_spaces / new_ts;
			num_spaces -= (num_spaces / new_ts) * new_ts;
		    }
		    if (curbuf->b_p_et || got_tab ||
					(num_spaces + num_tabs < len))
		    {
			if (did_undo == FALSE)
			{
			    did_undo = TRUE;
			    if (u_save((linenr_T)(lnum - 1),
						(linenr_T)(lnum + 1)) == FAIL)
			    {
				new_line = NULL;	/* flag out-of-memory */
				break;
			    }
			}

			/* len is actual number of white characters used */
			len = num_spaces + num_tabs;
			old_len = (long)STRLEN(ptr);
			new_line = lalloc(old_len - col + start_col + len + 1,
									TRUE);
			if (new_line == NULL)
			    break;
			if (start_col > 0)
			    mch_memmove(new_line, ptr, (size_t)start_col);
			mch_memmove(new_line + start_col + len,
				      ptr + col, (size_t)(old_len - col + 1));
			ptr = new_line + start_col;
			for (col = 0; col < len; col++)
			    ptr[col] = (col < num_tabs) ? '\t' : ' ';
			ml_replace(lnum, new_line, FALSE);
			if (first_line == 0)
			    first_line = lnum;
			last_line = lnum;
			ptr = new_line;
			col = start_col + len;
		    }
		}
		got_tab = FALSE;
		num_spaces = 0;
	    }
	    if (ptr[col] == NUL)
		break;
	    vcol += chartabsize(ptr + col, (colnr_T)vcol);
#ifdef FEAT_MBYTE
	    if (has_mbyte)
		col += (*mb_ptr2len)(ptr + col);
	    else
#endif
		++col;
	}
	if (new_line == NULL)		    /* out of memory */
	    break;
	line_breakcheck();
    }
    if (got_int)
	EMSG(_(e_interr));

    if (curbuf->b_p_ts != new_ts)
	redraw_curbuf_later(NOT_VALID);
    if (first_line != 0)
	changed_lines(first_line, 0, last_line + 1, 0L);

    curwin->w_p_list = save_list;	/* restore 'list' */

    curbuf->b_p_ts = new_ts;
    coladvance(curwin->w_curswant);

    u_clearline();
}
#endif

/*
 * :move command - move lines line1-line2 to line dest
 *
 * return FAIL for failure, OK otherwise
 */
    int
do_move(line1, line2, dest)
    linenr_T	line1;
    linenr_T	line2;
    linenr_T	dest;
{
    char_u	*str;
    linenr_T	l;
    linenr_T	extra;	    /* Num lines added before line1 */
    linenr_T	num_lines;  /* Num lines moved */
    linenr_T	last_line;  /* Last line in file after adding new text */

    if (dest >= line1 && dest < line2)
    {
	EMSG(_("E134: Move lines into themselves"));
	return FAIL;
    }

    num_lines = line2 - line1 + 1;

    /*
     * First we copy the old text to its new location -- webb
     * Also copy the flag that ":global" command uses.
     */
    if (u_save(dest, dest + 1) == FAIL)
	return FAIL;
    for (extra = 0, l = line1; l <= line2; l++)
    {
	str = vim_strsave(ml_get(l + extra));
	if (str != NULL)
	{
	    ml_append(dest + l - line1, str, (colnr_T)0, FALSE);
	    vim_free(str);
	    if (dest < line1)
		extra++;
	}
    }

    /*
     * Now we must be careful adjusting our marks so that we don't overlap our
     * mark_adjust() calls.
     *
     * We adjust the marks within the old text so that they refer to the
     * last lines of the file (temporarily), because we know no other marks
     * will be set there since these line numbers did not exist until we added
     * our new lines.
     *
     * Then we adjust the marks on lines between the old and new text positions
     * (either forwards or backwards).
     *
     * And Finally we adjust the marks we put at the end of the file back to
     * their final destination at the new text position -- webb
     */
    last_line = curbuf->b_ml.ml_line_count;
    mark_adjust(line1, line2, last_line - line2, 0L);
    if (dest >= line2)
    {
	mark_adjust(line2 + 1, dest, -num_lines, 0L);
	curbuf->b_op_start.lnum = dest - num_lines + 1;
	curbuf->b_op_end.lnum = dest;
    }
    else
    {
	mark_adjust(dest + 1, line1 - 1, num_lines, 0L);
	curbuf->b_op_start.lnum = dest + 1;
	curbuf->b_op_end.lnum = dest + num_lines;
    }
    curbuf->b_op_start.col = curbuf->b_op_end.col = 0;
    mark_adjust(last_line - num_lines + 1, last_line,
					     -(last_line - dest - extra), 0L);

    /*
     * Now we delete the original text -- webb
     */
    if (u_save(line1 + extra - 1, line2 + extra + 1) == FAIL)
	return FAIL;

    for (l = line1; l <= line2; l++)
	ml_delete(line1 + extra, TRUE);

    if (!global_busy && num_lines > p_report)
    {
	if (num_lines == 1)
	    MSG(_("1 line moved"));
	else
	    smsg((char_u *)_("%ld lines moved"), num_lines);
    }

    /*
     * Leave the cursor on the last of the moved lines.
     */
    if (dest >= line1)
	curwin->w_cursor.lnum = dest;
    else
	curwin->w_cursor.lnum = dest + (line2 - line1) + 1;

    if (line1 < dest)
	changed_lines(line1, 0, dest + num_lines + 1, 0L);
    else
	changed_lines(dest + 1, 0, line1 + num_lines, 0L);

    return OK;
}

/*
 * ":copy"
 */
    void
ex_copy(line1, line2, n)
    linenr_T	line1;
    linenr_T	line2;
    linenr_T	n;
{
    linenr_T	count;
    char_u	*p;

    count = line2 - line1 + 1;
    curbuf->b_op_start.lnum = n + 1;
    curbuf->b_op_end.lnum = n + count;
    curbuf->b_op_start.col = curbuf->b_op_end.col = 0;

    /*
     * there are three situations:
     * 1. destination is above line1
     * 2. destination is between line1 and line2
     * 3. destination is below line2
     *
     * n = destination (when starting)
     * curwin->w_cursor.lnum = destination (while copying)
     * line1 = start of source (while copying)
     * line2 = end of source (while copying)
     */
    if (u_save(n, n + 1) == FAIL)
	return;

    curwin->w_cursor.lnum = n;
    while (line1 <= line2)
    {
	/* need to use vim_strsave() because the line will be unlocked within
	 * ml_append() */
	p = vim_strsave(ml_get(line1));
	if (p != NULL)
	{
	    ml_append(curwin->w_cursor.lnum, p, (colnr_T)0, FALSE);
	    vim_free(p);
	}
	/* situation 2: skip already copied lines */
	if (line1 == n)
	    line1 = curwin->w_cursor.lnum;
	++line1;
	if (curwin->w_cursor.lnum < line1)
	    ++line1;
	if (curwin->w_cursor.lnum < line2)
	    ++line2;
	++curwin->w_cursor.lnum;
    }

    appended_lines_mark(n, count);

    msgmore((long)count);
}

static char_u	*prevcmd = NULL;	/* the previous command */

#if defined(EXITFREE) || defined(PROTO)
    void
free_prev_shellcmd()
{
    vim_free(prevcmd);
}
#endif

/*
 * Handle the ":!cmd" command.	Also for ":r !cmd" and ":w !cmd"
 * Bangs in the argument are replaced with the previously entered command.
 * Remember the argument.
 */
    void
do_bang(addr_count, eap, forceit, do_in, do_out)
    int		addr_count;
    exarg_T	*eap;
    int		forceit;
    int		do_in, do_out;
{
    char_u		*arg = eap->arg;	/* command */
    linenr_T		line1 = eap->line1;	/* start of range */
    linenr_T		line2 = eap->line2;	/* end of range */
    char_u		*newcmd = NULL;		/* the new command */
    int			free_newcmd = FALSE;    /* need to free() newcmd */
    int			ins_prevcmd;
    char_u		*t;
    char_u		*p;
    char_u		*trailarg;
    int			len;
    int			scroll_save = msg_scroll;

    /*
     * Disallow shell commands for "rvim".
     * Disallow shell commands from .exrc and .vimrc in current directory for
     * security reasons.
     */
    if (check_restricted() || check_secure())
	return;

    if (addr_count == 0)		/* :! */
    {
	msg_scroll = FALSE;	    /* don't scroll here */
	autowrite_all();
	msg_scroll = scroll_save;
    }

    /*
     * Try to find an embedded bang, like in :!<cmd> ! [args]
     * (:!! is indicated by the 'forceit' variable)
     */
    ins_prevcmd = forceit;
    trailarg = arg;
    do
    {
	len = (int)STRLEN(trailarg) + 1;
	if (newcmd != NULL)
	    len += (int)STRLEN(newcmd);
	if (ins_prevcmd)
	{
	    if (prevcmd == NULL)
	    {
		EMSG(_(e_noprev));
		vim_free(newcmd);
		return;
	    }
	    len += (int)STRLEN(prevcmd);
	}
	if ((t = alloc((unsigned)len)) == NULL)
	{
	    vim_free(newcmd);
	    return;
	}
	*t = NUL;
	if (newcmd != NULL)
	    STRCAT(t, newcmd);
	if (ins_prevcmd)
	    STRCAT(t, prevcmd);
	p = t + STRLEN(t);
	STRCAT(t, trailarg);
	vim_free(newcmd);
	newcmd = t;

	/*
	 * Scan the rest of the argument for '!', which is replaced by the
	 * previous command.  "\!" is replaced by "!" (this is vi compatible).
	 */
	trailarg = NULL;
	while (*p)
	{
	    if (*p == '!')
	    {
		if (p > newcmd && p[-1] == '\\')
		    STRMOVE(p - 1, p);
		else
		{
		    trailarg = p;
		    *trailarg++ = NUL;
		    ins_prevcmd = TRUE;
		    break;
		}
	    }
	    ++p;
	}
    } while (trailarg != NULL);

    vim_free(prevcmd);
    prevcmd = newcmd;

    if (bangredo)	    /* put cmd in redo buffer for ! command */
    {
	AppendToRedobuffLit(prevcmd, -1);
	AppendToRedobuff((char_u *)"\n");
	bangredo = FALSE;
    }
    /*
     * Add quotes around the command, for shells that need them.
     */
    if (*p_shq != NUL)
    {
	newcmd = alloc((unsigned)(STRLEN(prevcmd) + 2 * STRLEN(p_shq) + 1));
	if (newcmd == NULL)
	    return;
	STRCPY(newcmd, p_shq);
	STRCAT(newcmd, prevcmd);
	STRCAT(newcmd, p_shq);
	free_newcmd = TRUE;
    }
    if (addr_count == 0)		/* :! */
    {
	/* echo the command */
	msg_start();
	msg_putchar(':');
	msg_putchar('!');
	msg_outtrans(newcmd);
	msg_clr_eos();
	windgoto(msg_row, msg_col);

	do_shell(newcmd, 0);
    }
    else				/* :range! */
    {
	/* Careful: This may recursively call do_bang() again! (because of
	 * autocommands) */
	do_filter(line1, line2, eap, newcmd, do_in, do_out);
#ifdef FEAT_AUTOCMD
	apply_autocmds(EVENT_SHELLFILTERPOST, NULL, NULL, FALSE, curbuf);
#endif
    }
    if (free_newcmd)
	vim_free(newcmd);
}

/*
 * do_filter: filter lines through a command given by the user
 *
 * We mostly use temp files and the call_shell() routine here. This would
 * normally be done using pipes on a UNIX machine, but this is more portable
 * to non-unix machines. The call_shell() routine needs to be able
 * to deal with redirection somehow, and should handle things like looking
 * at the PATH env. variable, and adding reasonable extensions to the
 * command name given by the user. All reasonable versions of call_shell()
 * do this.
 * Alternatively, if on Unix and redirecting input or output, but not both,
 * and the 'shelltemp' option isn't set, use pipes.
 * We use input redirection if do_in is TRUE.
 * We use output redirection if do_out is TRUE.
 */
    static void
do_filter(line1, line2, eap, cmd, do_in, do_out)
    linenr_T	line1, line2;
    exarg_T	*eap;		/* for forced 'ff' and 'fenc' */
    char_u	*cmd;
    int		do_in, do_out;
{
    char_u	*itmp = NULL;
    char_u	*otmp = NULL;
    linenr_T	linecount;
    linenr_T	read_linecount;
    pos_T	cursor_save;
    char_u	*cmd_buf;
#ifdef FEAT_AUTOCMD
    buf_T	*old_curbuf = curbuf;
#endif
    int		shell_flags = 0;

    if (*cmd == NUL)	    /* no filter command */
	return;

#ifdef WIN3264
    /*
     * Check if external commands are allowed now.
     */
    if (can_end_termcap_mode(TRUE) == FALSE)
	return;
#endif

    cursor_save = curwin->w_cursor;
    linecount = line2 - line1 + 1;
    curwin->w_cursor.lnum = line1;
    curwin->w_cursor.col = 0;
    changed_line_abv_curs();
    invalidate_botline();

    /*
     * When using temp files:
     * 1. * Form temp file names
     * 2. * Write the lines to a temp file
     * 3.   Run the filter command on the temp file
     * 4. * Read the output of the command into the buffer
     * 5. * Delete the original lines to be filtered
     * 6. * Remove the temp files
     *
     * When writing the input with a pipe or when catching the output with a
     * pipe only need to do 3.
     */

    if (do_out)
	shell_flags |= SHELL_DOOUT;

#if !defined(USE_SYSTEM) && defined(UNIX)
    if (!do_in && do_out && !p_stmp)
    {
	/* Use a pipe to fetch stdout of the command, do not use a temp file. */
	shell_flags |= SHELL_READ;
	curwin->w_cursor.lnum = line2;
    }
    else if (do_in && !do_out && !p_stmp)
    {
	/* Use a pipe to write stdin of the command, do not use a temp file. */
	shell_flags |= SHELL_WRITE;
	curbuf->b_op_start.lnum = line1;
	curbuf->b_op_end.lnum = line2;
    }
    else if (do_in && do_out && !p_stmp)
    {
	/* Use a pipe to write stdin and fetch stdout of the command, do not
	 * use a temp file. */
	shell_flags |= SHELL_READ|SHELL_WRITE;
	curbuf->b_op_start.lnum = line1;
	curbuf->b_op_end.lnum = line2;
	curwin->w_cursor.lnum = line2;
    }
    else
#endif
	if ((do_in && (itmp = vim_tempname('i')) == NULL)
		|| (do_out && (otmp = vim_tempname('o')) == NULL))
	{
	    EMSG(_(e_notmp));
	    goto filterend;
	}

/*
 * The writing and reading of temp files will not be shown.
 * Vi also doesn't do this and the messages are not very informative.
 */
    ++no_wait_return;		/* don't call wait_return() while busy */
    if (itmp != NULL && buf_write(curbuf, itmp, NULL, line1, line2, eap,
					   FALSE, FALSE, FALSE, TRUE) == FAIL)
    {
	msg_putchar('\n');		/* keep message from buf_write() */
	--no_wait_return;
#if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
	if (!aborting())
#endif
	    (void)EMSG2(_(e_notcreate), itmp);	/* will call wait_return */
	goto filterend;
    }
#ifdef FEAT_AUTOCMD
    if (curbuf != old_curbuf)
	goto filterend;
#endif

    if (!do_out)
	msg_putchar('\n');

    /* Create the shell command in allocated memory. */
    cmd_buf = make_filter_cmd(cmd, itmp, otmp);
    if (cmd_buf == NULL)
	goto filterend;

    windgoto((int)Rows - 1, 0);
    cursor_on();

    /*
     * When not redirecting the output the command can write anything to the
     * screen. If 'shellredir' is equal to ">", screen may be messed up by
     * stderr output of external command. Clear the screen later.
     * If do_in is FALSE, this could be something like ":r !cat", which may
     * also mess up the screen, clear it later.
     */
    if (!do_out || STRCMP(p_srr, ">") == 0 || !do_in)
	redraw_later_clear();

    if (do_out)
    {
	if (u_save((linenr_T)(line2), (linenr_T)(line2 + 1)) == FAIL)
	{
	    vim_free(cmd_buf);
	    goto error;
	}
	redraw_curbuf_later(VALID);
    }
    read_linecount = curbuf->b_ml.ml_line_count;

    /*
     * When call_shell() fails wait_return() is called to give the user a
     * chance to read the error messages. Otherwise errors are ignored, so you
     * can see the error messages from the command that appear on stdout; use
     * 'u' to fix the text
     * Switch to cooked mode when not redirecting stdin, avoids that something
     * like ":r !cat" hangs.
     * Pass on the SHELL_DOOUT flag when the output is being redirected.
     */
    if (call_shell(cmd_buf, SHELL_FILTER | SHELL_COOKED | shell_flags))
    {
	redraw_later_clear();
	wait_return(FALSE);
    }
    vim_free(cmd_buf);

    did_check_timestamps = FALSE;
    need_check_timestamps = TRUE;

    /* When interrupting the shell command, it may still have produced some
     * useful output.  Reset got_int here, so that readfile() won't cancel
     * reading. */
    ui_breakcheck();
    got_int = FALSE;

    if (do_out)
    {
	if (otmp != NULL)
	{
	    if (readfile(otmp, NULL, line2, (linenr_T)0, (linenr_T)MAXLNUM,
						    eap, READ_FILTER) == FAIL)
	    {
#if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
		if (!aborting())
#endif
		{
		    msg_putchar('\n');
		    EMSG2(_(e_notread), otmp);
		}
		goto error;
	    }
#ifdef FEAT_AUTOCMD
	    if (curbuf != old_curbuf)
		goto filterend;
#endif
	}

	read_linecount = curbuf->b_ml.ml_line_count - read_linecount;

	if (shell_flags & SHELL_READ)
	{
	    curbuf->b_op_start.lnum = line2 + 1;
	    curbuf->b_op_end.lnum = curwin->w_cursor.lnum;
	    appended_lines_mark(line2, read_linecount);
	}

	if (do_in)
	{
	    if (cmdmod.keepmarks || vim_strchr(p_cpo, CPO_REMMARK) == NULL)
	    {
		if (read_linecount >= linecount)
		    /* move all marks from old lines to new lines */
		    mark_adjust(line1, line2, linecount, 0L);
		else
		{
		    /* move marks from old lines to new lines, delete marks
		     * that are in deleted lines */
		    mark_adjust(line1, line1 + read_linecount - 1,
								linecount, 0L);
		    mark_adjust(line1 + read_linecount, line2, MAXLNUM, 0L);
		}
	    }

	    /*
	     * Put cursor on first filtered line for ":range!cmd".
	     * Adjust '[ and '] (set by buf_write()).
	     */
	    curwin->w_cursor.lnum = line1;
	    del_lines(linecount, TRUE);
	    curbuf->b_op_start.lnum -= linecount;	/* adjust '[ */
	    curbuf->b_op_end.lnum -= linecount;		/* adjust '] */
	    write_lnum_adjust(-linecount);		/* adjust last line
							   for next write */
#ifdef FEAT_FOLDING
	    foldUpdate(curwin, curbuf->b_op_start.lnum, curbuf->b_op_end.lnum);
#endif
	}
	else
	{
	    /*
	     * Put cursor on last new line for ":r !cmd".
	     */
	    linecount = curbuf->b_op_end.lnum - curbuf->b_op_start.lnum + 1;
	    curwin->w_cursor.lnum = curbuf->b_op_end.lnum;
	}

	beginline(BL_WHITE | BL_FIX);	    /* cursor on first non-blank */
	--no_wait_return;

	if (linecount > p_report)
	{
	    if (do_in)
	    {
		vim_snprintf((char *)msg_buf, sizeof(msg_buf),
				    _("%ld lines filtered"), (long)linecount);
		if (msg(msg_buf) && !msg_scroll)
		    /* save message to display it after redraw */
		    set_keep_msg(msg_buf, 0);
	    }
	    else
		msgmore((long)linecount);
	}
    }
    else
    {
error:
	/* put cursor back in same position for ":w !cmd" */
	curwin->w_cursor = cursor_save;
	--no_wait_return;
	wait_return(FALSE);
    }

filterend:

#ifdef FEAT_AUTOCMD
    if (curbuf != old_curbuf)
    {
	--no_wait_return;
	EMSG(_("E135: *Filter* Autocommands must not change current buffer"));
    }
#endif
    if (itmp != NULL)
	mch_remove(itmp);
    if (otmp != NULL)
	mch_remove(otmp);
    vim_free(itmp);
    vim_free(otmp);
}

/*
 * Call a shell to execute a command.
 * When "cmd" is NULL start an interactive shell.
 */
    void
do_shell(cmd, flags)
    char_u	*cmd;
    int		flags;	/* may be SHELL_DOOUT when output is redirected */
{
    buf_T	*buf;
#ifndef FEAT_GUI_MSWIN
    int		save_nwr;
#endif
#ifdef MSWIN
    int		winstart = FALSE;
#endif

    /*
     * Disallow shell commands for "rvim".
     * Disallow shell commands from .exrc and .vimrc in current directory for
     * security reasons.
     */
    if (check_restricted() || check_secure())
    {
	msg_end();
	return;
    }

#ifdef MSWIN
    /*
     * Check if external commands are allowed now.
     */
    if (can_end_termcap_mode(TRUE) == FALSE)
	return;

    /*
     * Check if ":!start" is used.
     */
    if (cmd != NULL)
	winstart = (STRNICMP(cmd, "start ", 6) == 0);
#endif

    /*
     * For autocommands we want to get the output on the current screen, to
     * avoid having to type return below.
     */
    msg_putchar('\r');			/* put cursor at start of line */
#ifdef FEAT_AUTOCMD
    if (!autocmd_busy)
#endif
    {
#ifdef MSWIN
	if (!winstart)
#endif
	    stoptermcap();
    }
#ifdef MSWIN
    if (!winstart)
#endif
	msg_putchar('\n');		/* may shift screen one line up */

    /* warning message before calling the shell */
    if (p_warn
#ifdef FEAT_AUTOCMD
		&& !autocmd_busy
#endif
		&& msg_silent == 0)
	for (buf = firstbuf; buf; buf = buf->b_next)
	    if (bufIsChanged(buf))
	    {
#ifdef FEAT_GUI_MSWIN
		if (!winstart)
		    starttermcap();	/* don't want a message box here */
#endif
		MSG_PUTS(_("[No write since last change]\n"));
#ifdef FEAT_GUI_MSWIN
		if (!winstart)
		    stoptermcap();
#endif
		break;
	    }

    /* This windgoto is required for when the '\n' resulted in a "delete line
     * 1" command to the terminal. */
    if (!swapping_screen())
	windgoto(msg_row, msg_col);
    cursor_on();
    (void)call_shell(cmd, SHELL_COOKED | flags);
    did_check_timestamps = FALSE;
    need_check_timestamps = TRUE;

    /*
     * put the message cursor at the end of the screen, avoids wait_return()
     * to overwrite the text that the external command showed
     */
    if (!swapping_screen())
    {
	msg_row = Rows - 1;
	msg_col = 0;
    }

#ifdef FEAT_AUTOCMD
    if (autocmd_busy)
    {
	if (msg_silent == 0)
	    redraw_later_clear();
    }
    else
#endif
    {
	/*
	 * For ":sh" there is no need to call wait_return(), just redraw.
	 * Also for the Win32 GUI (the output is in a console window).
	 * Otherwise there is probably text on the screen that the user wants
	 * to read before redrawing, so call wait_return().
	 */
#ifndef FEAT_GUI_MSWIN
	if (cmd == NULL
# ifdef WIN3264
		|| (winstart && !need_wait_return)
# endif
	   )
	{
	    if (msg_silent == 0)
		redraw_later_clear();
	    need_wait_return = FALSE;
	}
	else
	{
	    /*
	     * If we switch screens when starttermcap() is called, we really
	     * want to wait for "hit return to continue".
	     */
	    save_nwr = no_wait_return;
	    if (swapping_screen())
		no_wait_return = FALSE;
# ifdef AMIGA
	    wait_return(term_console ? -1 : msg_silent == 0);	/* see below */
# else
	    wait_return(msg_silent == 0);
# endif
	    no_wait_return = save_nwr;
	}
#endif /* FEAT_GUI_W32 */

#ifdef MSWIN
	if (!winstart) /* if winstart==TRUE, never stopped termcap! */
#endif
	    starttermcap();	/* start termcap if not done by wait_return() */

	/*
	 * In an Amiga window redrawing is caused by asking the window size.
	 * If we got an interrupt this will not work. The chance that the
	 * window size is wrong is very small, but we need to redraw the
	 * screen.  Don't do this if ':' hit in wait_return().	THIS IS UGLY
	 * but it saves an extra redraw.
	 */
#ifdef AMIGA
	if (skip_redraw)		/* ':' hit in wait_return() */
	{
	    if (msg_silent == 0)
		redraw_later_clear();
	}
	else if (term_console)
	{
	    OUT_STR(IF_EB("\033[0 q", ESC_STR "[0 q"));	/* get window size */
	    if (got_int && msg_silent == 0)
		redraw_later_clear();	/* if got_int is TRUE, redraw needed */
	    else
		must_redraw = 0;	/* no extra redraw needed */
	}
#endif
    }

    /* display any error messages now */
    display_errors();

#ifdef FEAT_AUTOCMD
    apply_autocmds(EVENT_SHELLCMDPOST, NULL, NULL, FALSE, curbuf);
#endif
}

/*
 * Create a shell command from a command string, input redirection file and
 * output redirection file.
 * Returns an allocated string with the shell command, or NULL for failure.
 */
    char_u *
make_filter_cmd(cmd, itmp, otmp)
    char_u	*cmd;		/* command */
    char_u	*itmp;		/* NULL or name of input file */
    char_u	*otmp;		/* NULL or name of output file */
{
    char_u	*buf;
    long_u	len;

    len = (long_u)STRLEN(cmd) + 3;			/* "()" + NUL */
    if (itmp != NULL)
	len += (long_u)STRLEN(itmp) + 9;		/* " { < " + " } " */
    if (otmp != NULL)
	len += (long_u)STRLEN(otmp) + (long_u)STRLEN(p_srr) + 2; /* "  " */
    buf = lalloc(len, TRUE);
    if (buf == NULL)
	return NULL;

#if (defined(UNIX) && !defined(ARCHIE)) || defined(OS2)
    /*
     * Put braces around the command (for concatenated commands) when
     * redirecting input and/or output.
     */
    if (itmp != NULL || otmp != NULL)
	vim_snprintf((char *)buf, len, "(%s)", (char *)cmd);
    else
	STRCPY(buf, cmd);
    if (itmp != NULL)
    {
	STRCAT(buf, " < ");
	STRCAT(buf, itmp);
    }
#else
    /*
     * for shells that don't understand braces around commands, at least allow
     * the use of commands in a pipe.
     */
    STRCPY(buf, cmd);
    if (itmp != NULL)
    {
	char_u	*p;

	/*
	 * If there is a pipe, we have to put the '<' in front of it.
	 * Don't do this when 'shellquote' is not empty, otherwise the
	 * redirection would be inside the quotes.
	 */
	if (*p_shq == NUL)
	{
	    p = vim_strchr(buf, '|');
	    if (p != NULL)
		*p = NUL;
	}
	STRCAT(buf, " <");	/* " < " causes problems on Amiga */
	STRCAT(buf, itmp);
	if (*p_shq == NUL)
	{
	    p = vim_strchr(cmd, '|');
	    if (p != NULL)
	    {
		STRCAT(buf, " ");   /* insert a space before the '|' for DOS */
		STRCAT(buf, p);
	    }
	}
    }
#endif
    if (otmp != NULL)
	append_redir(buf, (int)len, p_srr, otmp);

    return buf;
}

/*
 * Append output redirection for file "fname" to the end of string buffer
 * "buf[buflen]"
 * Works with the 'shellredir' and 'shellpipe' options.
 * The caller should make sure that there is enough room:
 *	STRLEN(opt) + STRLEN(fname) + 3
 */
    void
append_redir(buf, buflen, opt, fname)
    char_u	*buf;
    int		buflen;
    char_u	*opt;
    char_u	*fname;
{
    char_u	*p;
    char_u	*end;

    end = buf + STRLEN(buf);
    /* find "%s", skipping "%%" */
    for (p = opt; (p = vim_strchr(p, '%')) != NULL; ++p)
	if (p[1] == 's')
	    break;
    if (p != NULL)
    {
	*end = ' '; /* not really needed? Not with sh, ksh or bash */
	vim_snprintf((char *)end + 1, (size_t)(buflen - (end + 1 - buf)),
						  (char *)opt, (char *)fname);
    }
    else
	vim_snprintf((char *)end, (size_t)(buflen - (end - buf)),
#ifdef FEAT_QUICKFIX
		" %s %s",
#else
		" %s%s",	/* " > %s" causes problems on Amiga */
#endif
		(char *)opt, (char *)fname);
}

#ifdef FEAT_VIMINFO

static int no_viminfo __ARGS((void));
static int  viminfo_errcnt;

    static int
no_viminfo()
{
    /* "vim -i NONE" does not read or write a viminfo file */
    return (use_viminfo != NULL && STRCMP(use_viminfo, "NONE") == 0);
}

/*
 * Report an error for reading a viminfo file.
 * Count the number of errors.	When there are more than 10, return TRUE.
 */
    int
viminfo_error(errnum, message, line)
    char    *errnum;
    char    *message;
    char_u  *line;
{
    vim_snprintf((char *)IObuff, IOSIZE, _("%sviminfo: %s in line: "),
							     errnum, message);
    STRNCAT(IObuff, line, IOSIZE - STRLEN(IObuff) - 1);
    if (IObuff[STRLEN(IObuff) - 1] == '\n')
	IObuff[STRLEN(IObuff) - 1] = NUL;
    emsg(IObuff);
    if (++viminfo_errcnt >= 10)
    {
	EMSG(_("E136: viminfo: Too many errors, skipping rest of file"));
	return TRUE;
    }
    return FALSE;
}

/*
 * read_viminfo() -- Read the viminfo file.  Registers etc. which are already
 * set are not over-written unless "flags" includes VIF_FORCEIT. -- webb
 */
    int
read_viminfo(file, flags)
    char_u	*file;	    /* file name or NULL to use default name */
    int		flags;	    /* VIF_WANT_INFO et al. */
{
    FILE	*fp;
    char_u	*fname;

    if (no_viminfo())
	return FAIL;

    fname = viminfo_filename(file);	/* get file name in allocated buffer */
    if (fname == NULL)
	return FAIL;
    fp = mch_fopen((char *)fname, READBIN);

    if (p_verbose > 0)
    {
	verbose_enter();
	smsg((char_u *)_("Reading viminfo file \"%s\"%s%s%s"),
		fname,
		(flags & VIF_WANT_INFO) ? _(" info") : "",
		(flags & VIF_WANT_MARKS) ? _(" marks") : "",
		(flags & VIF_GET_OLDFILES) ? _(" oldfiles") : "",
		fp == NULL ? _(" FAILED") : "");
	verbose_leave();
    }

    vim_free(fname);
    if (fp == NULL)
	return FAIL;

    viminfo_errcnt = 0;
    do_viminfo(fp, NULL, flags);

    fclose(fp);
    return OK;
}

/*
 * write_viminfo() -- Write the viminfo file.  The old one is read in first so
 * that effectively a merge of current info and old info is done.  This allows
 * multiple vims to run simultaneously, without losing any marks etc.  If
 * forceit is TRUE, then the old file is not read in, and only internal info is
 * written to the file. -- webb
 */
    void
write_viminfo(file, forceit)
    char_u	*file;
    int		forceit;
{
    char_u	*fname;
    FILE	*fp_in = NULL;	/* input viminfo file, if any */
    FILE	*fp_out = NULL;	/* output viminfo file */
    char_u	*tempname = NULL;	/* name of temp viminfo file */
    struct stat	st_new;		/* mch_stat() of potential new file */
    char_u	*wp;
#if defined(UNIX) || defined(VMS)
    mode_t	umask_save;
#endif
#ifdef UNIX
    int		shortname = FALSE;	/* use 8.3 file name */
    struct stat	st_old;		/* mch_stat() of existing viminfo file */
#endif
#ifdef WIN3264
    long	perm = -1;
#endif

    if (no_viminfo())
	return;

    fname = viminfo_filename(file);	/* may set to default if NULL */
    if (fname == NULL)
	return;

    fp_in = mch_fopen((char *)fname, READBIN);
    if (fp_in == NULL)
    {
	/* if it does exist, but we can't read it, don't try writing */
	if (mch_stat((char *)fname, &st_new) == 0)
	    goto end;
#if defined(UNIX) || defined(VMS)
	/*
	 * For Unix we create the .viminfo non-accessible for others,
	 * because it may contain text from non-accessible documents.
	 */
	umask_save = umask(077);
#endif
	fp_out = mch_fopen((char *)fname, WRITEBIN);
#if defined(UNIX) || defined(VMS)
	(void)umask(umask_save);
#endif
    }
    else
    {
	/*
	 * There is an existing viminfo file.  Create a temporary file to
	 * write the new viminfo into, in the same directory as the
	 * existing viminfo file, which will be renamed later.
	 */
#ifdef UNIX
	/*
	 * For Unix we check the owner of the file.  It's not very nice to
	 * overwrite a user's viminfo file after a "su root", with a
	 * viminfo file that the user can't read.
	 */
	st_old.st_dev = (dev_t)0;
	st_old.st_ino = 0;
	st_old.st_mode = 0600;
	if (mch_stat((char *)fname, &st_old) == 0
		&& getuid() != ROOT_UID
		&& !(st_old.st_uid == getuid()
			? (st_old.st_mode & 0200)
			: (st_old.st_gid == getgid()
				? (st_old.st_mode & 0020)
				: (st_old.st_mode & 0002))))
	{
	    int	tt = msg_didany;

	    /* avoid a wait_return for this message, it's annoying */
	    EMSG2(_("E137: Viminfo file is not writable: %s"), fname);
	    msg_didany = tt;
	    fclose(fp_in);
	    goto end;
	}
#endif
#ifdef WIN3264
	/* Get the file attributes of the existing viminfo file. */
	perm = mch_getperm(fname);
#endif

	/*
	 * Make tempname.
	 * May try twice: Once normal and once with shortname set, just in
	 * case somebody puts his viminfo file in an 8.3 filesystem.
	 */
	for (;;)
	{
	    tempname = buf_modname(
#ifdef UNIX
				    shortname,
#else
# ifdef SHORT_FNAME
				    TRUE,
# else
#  ifdef FEAT_GUI_W32
				    gui_is_win32s(),
#  else
				    FALSE,
#  endif
# endif
#endif
				    fname,
#ifdef VMS
				    (char_u *)"-tmp",
#else
				    (char_u *)".tmp",
#endif
				    FALSE);
	    if (tempname == NULL)		/* out of memory */
		break;

	    /*
	     * Check if tempfile already exists.  Never overwrite an
	     * existing file!
	     */
	    if (mch_stat((char *)tempname, &st_new) == 0)
	    {
#ifdef UNIX
		/*
		 * Check if tempfile is same as original file.  May happen
		 * when modname() gave the same file back.  E.g.  silly
		 * link, or file name-length reached.  Try again with
		 * shortname set.
		 */
		if (!shortname && st_new.st_dev == st_old.st_dev
					    && st_new.st_ino == st_old.st_ino)
		{
		    vim_free(tempname);
		    tempname = NULL;
		    shortname = TRUE;
		    continue;
		}
#endif
		/*
		 * Try another name.  Change one character, just before
		 * the extension.  This should also work for an 8.3
		 * file name, when after adding the extension it still is
		 * the same file as the original.
		 */
		wp = tempname + STRLEN(tempname) - 5;
		if (wp < gettail(tempname))	    /* empty file name? */
		    wp = gettail(tempname);
		for (*wp = 'z'; mch_stat((char *)tempname, &st_new) == 0;
								    --*wp)
		{
		    /*
		     * They all exist?  Must be something wrong! Don't
		     * write the viminfo file then.
		     */
		    if (*wp == 'a')
		    {
			vim_free(tempname);
			tempname = NULL;
			break;
		    }
		}
	    }
	    break;
	}

	if (tempname != NULL)
	{
#ifdef VMS
	    /* fdopen() fails for some reason */
	    umask_save = umask(077);
	    fp_out = mch_fopen((char *)tempname, WRITEBIN);
	    (void)umask(umask_save);
#else
	    int	fd;

	    /* Use mch_open() to be able to use O_NOFOLLOW and set file
	     * protection:
	     * Unix: same as original file, but strip s-bit.  Reset umask to
	     * avoid it getting in the way.
	     * Others: r&w for user only. */
# ifdef UNIX
	    umask_save = umask(0);
	    fd = mch_open((char *)tempname,
		    O_CREAT|O_EXTRA|O_EXCL|O_WRONLY|O_NOFOLLOW,
				       (int)((st_old.st_mode & 0777) | 0600));
	    (void)umask(umask_save);
# else
	    fd = mch_open((char *)tempname,
			    O_CREAT|O_EXTRA|O_EXCL|O_WRONLY|O_NOFOLLOW, 0600);
# endif
	    if (fd < 0)
		fp_out = NULL;
	    else
		fp_out = fdopen(fd, WRITEBIN);
#endif /* VMS */

	    /*
	     * If we can't create in the same directory, try creating a
	     * "normal" temp file.
	     */
	    if (fp_out == NULL)
	    {
		vim_free(tempname);
		if ((tempname = vim_tempname('o')) != NULL)
		    fp_out = mch_fopen((char *)tempname, WRITEBIN);
	    }

#if defined(UNIX) && defined(HAVE_FCHOWN)
	    /*
	     * Make sure the owner can read/write it.  This only works for
	     * root.
	     */
	    if (fp_out != NULL)
		ignored = fchown(fileno(fp_out), st_old.st_uid, st_old.st_gid);
#endif
	}
    }

    /*
     * Check if the new viminfo file can be written to.
     */
    if (fp_out == NULL)
    {
	EMSG2(_("E138: Can't write viminfo file %s!"),
		       (fp_in == NULL || tempname == NULL) ? fname : tempname);
	if (fp_in != NULL)
	    fclose(fp_in);
	goto end;
    }

    if (p_verbose > 0)
    {
	verbose_enter();
	smsg((char_u *)_("Writing viminfo file \"%s\""), fname);
	verbose_leave();
    }

    viminfo_errcnt = 0;
    do_viminfo(fp_in, fp_out, forceit ? 0 : (VIF_WANT_INFO | VIF_WANT_MARKS));

    fclose(fp_out);	    /* errors are ignored !? */
    if (fp_in != NULL)
    {
	fclose(fp_in);

	/*
	 * In case of an error keep the original viminfo file.
	 * Otherwise rename the newly written file.
	 */
	if (viminfo_errcnt || vim_rename(tempname, fname) == -1)
	    mch_remove(tempname);

#ifdef WIN3264
	/* If the viminfo file was hidden then also hide the new file. */
	if (perm > 0 && (perm & FILE_ATTRIBUTE_HIDDEN))
	    mch_hide(fname);
#endif
    }

end:
    vim_free(fname);
    vim_free(tempname);
}

/*
 * Get the viminfo file name to use.
 * If "file" is given and not empty, use it (has already been expanded by
 * cmdline functions).
 * Otherwise use "-i file_name", value from 'viminfo' or the default, and
 * expand environment variables.
 * Returns an allocated string.  NULL when out of memory.
 */
    static char_u *
viminfo_filename(file)
    char_u	*file;
{
    if (file == NULL || *file == NUL)
    {
	if (use_viminfo != NULL)
	    file = use_viminfo;
	else if ((file = find_viminfo_parameter('n')) == NULL || *file == NUL)
	{
#ifdef VIMINFO_FILE2
	    /* don't use $HOME when not defined (turned into "c:/"!). */
# ifdef VMS
	    if (mch_getenv((char_u *)"SYS$LOGIN") == NULL)
# else
	    if (mch_getenv((char_u *)"HOME") == NULL)
# endif
	    {
		/* don't use $VIM when not available. */
		expand_env((char_u *)"$VIM", NameBuff, MAXPATHL);
		if (STRCMP("$VIM", NameBuff) != 0)  /* $VIM was expanded */
		    file = (char_u *)VIMINFO_FILE2;
		else
		    file = (char_u *)VIMINFO_FILE;
	    }
	    else
#endif
		file = (char_u *)VIMINFO_FILE;
	}
	expand_env(file, NameBuff, MAXPATHL);
	file = NameBuff;
    }
    return vim_strsave(file);
}

/*
 * do_viminfo() -- Should only be called from read_viminfo() & write_viminfo().
 */
    static void
do_viminfo(fp_in, fp_out, flags)
    FILE	*fp_in;
    FILE	*fp_out;
    int		flags;
{
    int		count = 0;
    int		eof = FALSE;
    vir_T	vir;

    if ((vir.vir_line = alloc(LSIZE)) == NULL)
	return;
    vir.vir_fd = fp_in;
#ifdef FEAT_MBYTE
    vir.vir_conv.vc_type = CONV_NONE;
#endif

    if (fp_in != NULL)
    {
	if (flags & VIF_WANT_INFO)
	    eof = read_viminfo_up_to_marks(&vir,
					 flags & VIF_FORCEIT, fp_out != NULL);
	else
	    /* Skip info, find start of marks */
	    while (!(eof = viminfo_readline(&vir))
		    && vir.vir_line[0] != '>')
		;
    }
    if (fp_out != NULL)
    {
	/* Write the info: */
	fprintf(fp_out, _("# This viminfo file was generated by Vim %s.\n"),
							  VIM_VERSION_MEDIUM);
	fputs(_("# You may edit it if you're careful!\n\n"), fp_out);
#ifdef FEAT_MBYTE
	fputs(_("# Value of 'encoding' when this file was written\n"), fp_out);
	fprintf(fp_out, "*encoding=%s\n\n", p_enc);
#endif
	write_viminfo_search_pattern(fp_out);
	write_viminfo_sub_string(fp_out);
#ifdef FEAT_CMDHIST
	write_viminfo_history(fp_out);
#endif
	write_viminfo_registers(fp_out);
#ifdef FEAT_EVAL
	write_viminfo_varlist(fp_out);
#endif
	write_viminfo_filemarks(fp_out);
	write_viminfo_bufferlist(fp_out);
	count = write_viminfo_marks(fp_out);
    }
    if (fp_in != NULL
	    && (flags & (VIF_WANT_MARKS | VIF_GET_OLDFILES | VIF_FORCEIT)))
	copy_viminfo_marks(&vir, fp_out, count, eof, flags);

    vim_free(vir.vir_line);
#ifdef FEAT_MBYTE
    if (vir.vir_conv.vc_type != CONV_NONE)
	convert_setup(&vir.vir_conv, NULL, NULL);
#endif
}

/*
 * read_viminfo_up_to_marks() -- Only called from do_viminfo().  Reads in the
 * first part of the viminfo file which contains everything but the marks that
 * are local to a file.  Returns TRUE when end-of-file is reached. -- webb
 */
    static int
read_viminfo_up_to_marks(virp, forceit, writing)
    vir_T	*virp;
    int		forceit;
    int		writing;
{
    int		eof;
    buf_T	*buf;

#ifdef FEAT_CMDHIST
    prepare_viminfo_history(forceit ? 9999 : 0);
#endif
    eof = viminfo_readline(virp);
    while (!eof && virp->vir_line[0] != '>')
    {
	switch (virp->vir_line[0])
	{
		/* Characters reserved for future expansion, ignored now */
	    case '+': /* "+40 /path/dir file", for running vim without args */
	    case '|': /* to be defined */
	    case '^': /* to be defined */
	    case '<': /* long line - ignored */
		/* A comment or empty line. */
	    case NUL:
	    case '\r':
	    case '\n':
	    case '#':
		eof = viminfo_readline(virp);
		break;
	    case '*': /* "*encoding=value" */
		eof = viminfo_encoding(virp);
		break;
	    case '!': /* global variable */
#ifdef FEAT_EVAL
		eof = read_viminfo_varlist(virp, writing);
#else
		eof = viminfo_readline(virp);
#endif
		break;
	    case '%': /* entry for buffer list */
		eof = read_viminfo_bufferlist(virp, writing);
		break;
	    case '"':
		eof = read_viminfo_register(virp, forceit);
		break;
	    case '/':	    /* Search string */
	    case '&':	    /* Substitute search string */
	    case '~':	    /* Last search string, followed by '/' or '&' */
		eof = read_viminfo_search_pattern(virp, forceit);
		break;
	    case '$':
		eof = read_viminfo_sub_string(virp, forceit);
		break;
	    case ':':
	    case '?':
	    case '=':
	    case '@':
#ifdef FEAT_CMDHIST
		eof = read_viminfo_history(virp);
#else
		eof = viminfo_readline(virp);
#endif
		break;
	    case '-':
	    case '\'':
		eof = read_viminfo_filemark(virp, forceit);
		break;
	    default:
		if (viminfo_error("E575: ", _("Illegal starting char"),
			    virp->vir_line))
		    eof = TRUE;
		else
		    eof = viminfo_readline(virp);
		break;
	}
    }

#ifdef FEAT_CMDHIST
    /* Finish reading history items. */
    finish_viminfo_history();
#endif

    /* Change file names to buffer numbers for fmarks. */
    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
	fmarks_check_names(buf);

    return eof;
}

/*
 * Compare the 'encoding' value in the viminfo file with the current value of
 * 'encoding'.  If different and the 'c' flag is in 'viminfo', setup for
 * conversion of text with iconv() in viminfo_readstring().
 */
    static int
viminfo_encoding(virp)
    vir_T	*virp;
{
#ifdef FEAT_MBYTE
    char_u	*p;
    int		i;

    if (get_viminfo_parameter('c') != 0)
    {
	p = vim_strchr(virp->vir_line, '=');
	if (p != NULL)
	{
	    /* remove trailing newline */
	    ++p;
	    for (i = 0; vim_isprintc(p[i]); ++i)
		;
	    p[i] = NUL;

	    convert_setup(&virp->vir_conv, p, p_enc);
	}
    }
#endif
    return viminfo_readline(virp);
}

/*
 * Read a line from the viminfo file.
 * Returns TRUE for end-of-file;
 */
    int
viminfo_readline(virp)
    vir_T	*virp;
{
    return vim_fgets(virp->vir_line, LSIZE, virp->vir_fd);
}

/*
 * check string read from viminfo file
 * remove '\n' at the end of the line
 * - replace CTRL-V CTRL-V with CTRL-V
 * - replace CTRL-V 'n'    with '\n'
 *
 * Check for a long line as written by viminfo_writestring().
 *
 * Return the string in allocated memory (NULL when out of memory).
 */
    char_u *
viminfo_readstring(virp, off, convert)
    vir_T	*virp;
    int		off;		    /* offset for virp->vir_line */
    int		convert UNUSED;	    /* convert the string */
{
    char_u	*retval;
    char_u	*s, *d;
    long	len;

    if (virp->vir_line[off] == Ctrl_V && vim_isdigit(virp->vir_line[off + 1]))
    {
	len = atol((char *)virp->vir_line + off + 1);
	retval = lalloc(len, TRUE);
	if (retval == NULL)
	{
	    /* Line too long?  File messed up?  Skip next line. */
	    (void)vim_fgets(virp->vir_line, 10, virp->vir_fd);
	    return NULL;
	}
	(void)vim_fgets(retval, (int)len, virp->vir_fd);
	s = retval + 1;	    /* Skip the leading '<' */
    }
    else
    {
	retval = vim_strsave(virp->vir_line + off);
	if (retval == NULL)
	    return NULL;
	s = retval;
    }

    /* Change CTRL-V CTRL-V to CTRL-V and CTRL-V n to \n in-place. */
    d = retval;
    while (*s != NUL && *s != '\n')
    {
	if (s[0] == Ctrl_V && s[1] != NUL)
	{
	    if (s[1] == 'n')
		*d++ = '\n';
	    else
		*d++ = Ctrl_V;
	    s += 2;
	}
	else
	    *d++ = *s++;
    }
    *d = NUL;

#ifdef FEAT_MBYTE
    if (convert && virp->vir_conv.vc_type != CONV_NONE && *retval != NUL)
    {
	d = string_convert(&virp->vir_conv, retval, NULL);
	if (d != NULL)
	{
	    vim_free(retval);
	    retval = d;
	}
    }
#endif

    return retval;
}

/*
 * write string to viminfo file
 * - replace CTRL-V with CTRL-V CTRL-V
 * - replace '\n'   with CTRL-V 'n'
 * - add a '\n' at the end
 *
 * For a long line:
 * - write " CTRL-V <length> \n " in first line
 * - write " < <string> \n "	  in second line
 */
    void
viminfo_writestring(fd, p)
    FILE	*fd;
    char_u	*p;
{
    int		c;
    char_u	*s;
    int		len = 0;

    for (s = p; *s != NUL; ++s)
    {
	if (*s == Ctrl_V || *s == '\n')
	    ++len;
	++len;
    }

    /* If the string will be too long, write its length and put it in the next
     * line.  Take into account that some room is needed for what comes before
     * the string (e.g., variable name).  Add something to the length for the
     * '<', NL and trailing NUL. */
    if (len > LSIZE / 2)
	fprintf(fd, IF_EB("\026%d\n<", CTRL_V_STR "%d\n<"), len + 3);

    while ((c = *p++) != NUL)
    {
	if (c == Ctrl_V || c == '\n')
	{
	    putc(Ctrl_V, fd);
	    if (c == '\n')
		c = 'n';
	}
	putc(c, fd);
    }
    putc('\n', fd);
}
#endif /* FEAT_VIMINFO */

/*
 * Implementation of ":fixdel", also used by get_stty().
 *  <BS>    resulting <Del>
 *   ^?		^H
 * not ^?	^?
 */
    void
do_fixdel(eap)
    exarg_T	*eap UNUSED;
{
    char_u  *p;

    p = find_termcode((char_u *)"kb");
    add_termcode((char_u *)"kD", p != NULL
	    && *p == DEL ? (char_u *)CTRL_H_STR : DEL_STR, FALSE);
}

    void
print_line_no_prefix(lnum, use_number, list)
    linenr_T	lnum;
    int		use_number;
    int		list;
{
    char_u	numbuf[30];

    if (curwin->w_p_nu || use_number)
    {
	vim_snprintf((char *)numbuf, sizeof(numbuf),
				   "%*ld ", number_width(curwin), (long)lnum);
	msg_puts_attr(numbuf, hl_attr(HLF_N));	/* Highlight line nrs */
    }
    msg_prt_line(ml_get(lnum), list);
}

/*
 * Print a text line.  Also in silent mode ("ex -s").
 */
    void
print_line(lnum, use_number, list)
    linenr_T	lnum;
    int		use_number;
    int		list;
{
    int		save_silent = silent_mode;

    msg_start();
    silent_mode = FALSE;
    info_message = TRUE;	/* use mch_msg(), not mch_errmsg() */
    print_line_no_prefix(lnum, use_number, list);
    if (save_silent)
    {
	msg_putchar('\n');
	cursor_on();		/* msg_start() switches it off */
	out_flush();
	silent_mode = save_silent;
    }
    info_message = FALSE;
}

/*
 * ":file[!] [fname]".
 */
    void
ex_file(eap)
    exarg_T	*eap;
{
    char_u	*fname, *sfname, *xfname;
    buf_T	*buf;

    /* ":0file" removes the file name.  Check for illegal uses ":3file",
     * "0file name", etc. */
    if (eap->addr_count > 0
	    && (*eap->arg != NUL
		|| eap->line2 > 0
		|| eap->addr_count > 1))
    {
	EMSG(_(e_invarg));
	return;
    }

    if (*eap->arg != NUL || eap->addr_count == 1)
    {
#ifdef FEAT_AUTOCMD
	buf = curbuf;
	apply_autocmds(EVENT_BUFFILEPRE, NULL, NULL, FALSE, curbuf);
	/* buffer changed, don't change name now */
	if (buf != curbuf)
	    return;
# ifdef FEAT_EVAL
	if (aborting())	    /* autocmds may abort script processing */
	    return;
# endif
#endif
	/*
	 * The name of the current buffer will be changed.
	 * A new (unlisted) buffer entry needs to be made to hold the old file
	 * name, which will become the alternate file name.
	 * But don't set the alternate file name if the buffer didn't have a
	 * name.
	 */
	fname = curbuf->b_ffname;
	sfname = curbuf->b_sfname;
	xfname = curbuf->b_fname;
	curbuf->b_ffname = NULL;
	curbuf->b_sfname = NULL;
	if (setfname(curbuf, eap->arg, NULL, TRUE) == FAIL)
	{
	    curbuf->b_ffname = fname;
	    curbuf->b_sfname = sfname;
	    return;
	}
	curbuf->b_flags |= BF_NOTEDITED;
	if (xfname != NULL && *xfname != NUL)
	{
	    buf = buflist_new(fname, xfname, curwin->w_cursor.lnum, 0);
	    if (buf != NULL && !cmdmod.keepalt)
		curwin->w_alt_fnum = buf->b_fnum;
	}
	vim_free(fname);
	vim_free(sfname);
#ifdef FEAT_AUTOCMD
	apply_autocmds(EVENT_BUFFILEPOST, NULL, NULL, FALSE, curbuf);
#endif
	/* Change directories when the 'acd' option is set. */
	DO_AUTOCHDIR
    }
    /* print full file name if :cd used */
    fileinfo(FALSE, FALSE, eap->forceit);
}

/*
 * ":update".
 */
    void
ex_update(eap)
    exarg_T	*eap;
{
    if (curbufIsChanged())
	(void)do_write(eap);
}

/*
 * ":write" and ":saveas".
 */
    void
ex_write(eap)
    exarg_T	*eap;
{
    if (eap->usefilter)		/* input lines to shell command */
	do_bang(1, eap, FALSE, TRUE, FALSE);
    else
	(void)do_write(eap);
}

/*
 * write current buffer to file 'eap->arg'
 * if 'eap->append' is TRUE, append to the file
 *
 * if *eap->arg == NUL write to current file
 *
 * return FAIL for failure, OK otherwise
 */
    int
do_write(eap)
    exarg_T	*eap;
{
    int		other;
    char_u	*fname = NULL;		/* init to shut up gcc */
    char_u	*ffname;
    int		retval = FAIL;
    char_u	*free_fname = NULL;
#ifdef FEAT_BROWSE
    char_u	*browse_file = NULL;
#endif
    buf_T	*alt_buf = NULL;

    if (not_writing())		/* check 'write' option */
	return FAIL;

    ffname = eap->arg;
#ifdef FEAT_BROWSE
    if (cmdmod.browse)
    {
	browse_file = do_browse(BROWSE_SAVE, (char_u *)_("Save As"), ffname,
						    NULL, NULL, NULL, curbuf);
	if (browse_file == NULL)
	    goto theend;
	ffname = browse_file;
    }
#endif
    if (*ffname == NUL)
    {
	if (eap->cmdidx == CMD_saveas)
	{
	    EMSG(_(e_argreq));
	    goto theend;
	}
	other = FALSE;
    }
    else
    {
	fname = ffname;
	free_fname = fix_fname(ffname);
	/*
	 * When out-of-memory, keep unexpanded file name, because we MUST be
	 * able to write the file in this situation.
	 */
	if (free_fname != NULL)
	    ffname = free_fname;
	other = otherfile(ffname);
    }

    /*
     * If we have a new file, put its name in the list of alternate file names.
     */
    if (other)
    {
	if (vim_strchr(p_cpo, CPO_ALTWRITE) != NULL
						 || eap->cmdidx == CMD_saveas)
	    alt_buf = setaltfname(ffname, fname, (linenr_T)1);
	else
	    alt_buf = buflist_findname(ffname);
	if (alt_buf != NULL && alt_buf->b_ml.ml_mfp != NULL)
	{
	    /* Overwriting a file that is loaded in another buffer is not a
	     * good idea. */
	    EMSG(_(e_bufloaded));
	    goto theend;
	}
    }

    /*
     * Writing to the current file is not allowed in readonly mode
     * and a file name is required.
     * "nofile" and "nowrite" buffers cannot be written implicitly either.
     */
    if (!other && (
#ifdef FEAT_QUICKFIX
		bt_dontwrite_msg(curbuf) ||
#endif
		check_fname() == FAIL || check_readonly(&eap->forceit, curbuf)))
	goto theend;

    if (!other)
    {
	ffname = curbuf->b_ffname;
	fname = curbuf->b_fname;
	/*
	 * Not writing the whole file is only allowed with '!'.
	 */
	if (	   (eap->line1 != 1
		    || eap->line2 != curbuf->b_ml.ml_line_count)
		&& !eap->forceit
		&& !eap->append
		&& !p_wa)
	{
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
	    if (p_confirm || cmdmod.confirm)
	    {
		if (vim_dialog_yesno(VIM_QUESTION, NULL,
			       (char_u *)_("Write partial file?"), 2) != VIM_YES)
		    goto theend;
		eap->forceit = TRUE;
	    }
	    else
#endif
	    {
		EMSG(_("E140: Use ! to write partial buffer"));
		goto theend;
	    }
	}
    }

    if (check_overwrite(eap, curbuf, fname, ffname, other) == OK)
    {
	if (eap->cmdidx == CMD_saveas && alt_buf != NULL)
	{
#ifdef FEAT_AUTOCMD
	    buf_T	*was_curbuf = curbuf;

	    apply_autocmds(EVENT_BUFFILEPRE, NULL, NULL, FALSE, curbuf);
	    apply_autocmds(EVENT_BUFFILEPRE, NULL, NULL, FALSE, alt_buf);
# ifdef FEAT_EVAL
	    if (curbuf != was_curbuf || aborting())
# else
	    if (curbuf != was_curbuf)
# endif
	    {
		/* buffer changed, don't change name now */
		retval = FAIL;
		goto theend;
	    }
#endif
	    /* Exchange the file names for the current and the alternate
	     * buffer.  This makes it look like we are now editing the buffer
	     * under the new name.  Must be done before buf_write(), because
	     * if there is no file name and 'cpo' contains 'F', it will set
	     * the file name. */
	    fname = alt_buf->b_fname;
	    alt_buf->b_fname = curbuf->b_fname;
	    curbuf->b_fname = fname;
	    fname = alt_buf->b_ffname;
	    alt_buf->b_ffname = curbuf->b_ffname;
	    curbuf->b_ffname = fname;
	    fname = alt_buf->b_sfname;
	    alt_buf->b_sfname = curbuf->b_sfname;
	    curbuf->b_sfname = fname;
	    buf_name_changed(curbuf);
#ifdef FEAT_AUTOCMD
	    apply_autocmds(EVENT_BUFFILEPOST, NULL, NULL, FALSE, curbuf);
	    apply_autocmds(EVENT_BUFFILEPOST, NULL, NULL, FALSE, alt_buf);
	    if (!alt_buf->b_p_bl)
	    {
		alt_buf->b_p_bl = TRUE;
		apply_autocmds(EVENT_BUFADD, NULL, NULL, FALSE, alt_buf);
	    }
# ifdef FEAT_EVAL
	    if (curbuf != was_curbuf || aborting())
# else
	    if (curbuf != was_curbuf)
# endif
	    {
		/* buffer changed, don't write the file */
		retval = FAIL;
		goto theend;
	    }

	    /* If 'filetype' was empty try detecting it now. */
	    if (*curbuf->b_p_ft == NUL)
	    {
		if (au_has_group((char_u *)"filetypedetect"))
		    (void)do_doautocmd((char_u *)"filetypedetect BufRead",
									TRUE);
		do_modelines(0);
	    }

	    /* Autocommands may have changed buffer names, esp. when
	     * 'autochdir' is set. */
	    fname = curbuf->b_sfname;
#endif
	}

	retval = buf_write(curbuf, ffname, fname, eap->line1, eap->line2,
				 eap, eap->append, eap->forceit, TRUE, FALSE);

	/* After ":saveas fname" reset 'readonly'. */
	if (eap->cmdidx == CMD_saveas)
	{
	    if (retval == OK)
	    {
		curbuf->b_p_ro = FALSE;
#ifdef FEAT_WINDOWS
		redraw_tabline = TRUE;
#endif
	    }
	    /* Change directories when the 'acd' option is set. */
	    DO_AUTOCHDIR
	}
    }

theend:
#ifdef FEAT_BROWSE
    vim_free(browse_file);
#endif
    vim_free(free_fname);
    return retval;
}

/*
 * Check if it is allowed to overwrite a file.  If b_flags has BF_NOTEDITED,
 * BF_NEW or BF_READERR, check for overwriting current file.
 * May set eap->forceit if a dialog says it's OK to overwrite.
 * Return OK if it's OK, FAIL if it is not.
 */
    static int
check_overwrite(eap, buf, fname, ffname, other)
    exarg_T	*eap;
    buf_T	*buf;
    char_u	*fname;	    /* file name to be used (can differ from
			       buf->ffname) */
    char_u	*ffname;    /* full path version of fname */
    int		other;	    /* writing under other name */
{
    /*
     * write to other file or b_flags set or not writing the whole file:
     * overwriting only allowed with '!'
     */
    if (       (other
		|| (buf->b_flags & BF_NOTEDITED)
		|| ((buf->b_flags & BF_NEW)
		    && vim_strchr(p_cpo, CPO_OVERNEW) == NULL)
		|| (buf->b_flags & BF_READERR))
	    && !p_wa
#ifdef FEAT_QUICKFIX
	    && !bt_nofile(buf)
#endif
	    && vim_fexists(ffname))
    {
	if (!eap->forceit && !eap->append)
	{
#ifdef UNIX
	    /* with UNIX it is possible to open a directory */
	    if (mch_isdir(ffname))
	    {
		EMSG2(_(e_isadir2), ffname);
		return FAIL;
	    }
#endif
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
	    if (p_confirm || cmdmod.confirm)
	    {
		char_u	buff[DIALOG_MSG_SIZE];

		dialog_msg(buff, _("Overwrite existing file \"%s\"?"), fname);
		if (vim_dialog_yesno(VIM_QUESTION, NULL, buff, 2) != VIM_YES)
		    return FAIL;
		eap->forceit = TRUE;
	    }
	    else
#endif
	    {
		EMSG(_(e_exists));
		return FAIL;
	    }
	}

	/* For ":w! filename" check that no swap file exists for "filename". */
	if (other && !emsg_silent)
	{
	    char_u	*dir;
	    char_u	*p;
	    int		r;
	    char_u	*swapname;

	    /* We only try the first entry in 'directory', without checking if
	     * it's writable.  If the "." directory is not writable the write
	     * will probably fail anyway.
	     * Use 'shortname' of the current buffer, since there is no buffer
	     * for the written file. */
	    if (*p_dir == NUL)
	    {
		dir = alloc(5);
		if (dir == NULL)
		    return FAIL;
		STRCPY(dir, ".");
	    }
	    else
	    {
		dir = alloc(MAXPATHL);
		if (dir == NULL)
		    return FAIL;
		p = p_dir;
		copy_option_part(&p, dir, MAXPATHL, ",");
	    }
	    swapname = makeswapname(fname, ffname, curbuf, dir);
	    vim_free(dir);
	    r = vim_fexists(swapname);
	    if (r)
	    {
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
		if (p_confirm || cmdmod.confirm)
		{
		    char_u	buff[DIALOG_MSG_SIZE];

		    dialog_msg(buff,
			    _("Swap file \"%s\" exists, overwrite anyway?"),
								    swapname);
		    if (vim_dialog_yesno(VIM_QUESTION, NULL, buff, 2)
								   != VIM_YES)
		    {
			vim_free(swapname);
			return FAIL;
		    }
		    eap->forceit = TRUE;
		}
		else
#endif
		{
		    EMSG2(_("E768: Swap file exists: %s (:silent! overrides)"),
								    swapname);
		    vim_free(swapname);
		    return FAIL;
		}
	    }
	    vim_free(swapname);
	}
    }
    return OK;
}

/*
 * Handle ":wnext", ":wNext" and ":wprevious" commands.
 */
    void
ex_wnext(eap)
    exarg_T	*eap;
{
    int		i;

    if (eap->cmd[1] == 'n')
	i = curwin->w_arg_idx + (int)eap->line2;
    else
	i = curwin->w_arg_idx - (int)eap->line2;
    eap->line1 = 1;
    eap->line2 = curbuf->b_ml.ml_line_count;
    if (do_write(eap) != FAIL)
	do_argfile(eap, i);
}

/*
 * ":wall", ":wqall" and ":xall": Write all changed files (and exit).
 */
    void
do_wqall(eap)
    exarg_T	*eap;
{
    buf_T	*buf;
    int		error = 0;
    int		save_forceit = eap->forceit;

    if (eap->cmdidx == CMD_xall || eap->cmdidx == CMD_wqall)
	exiting = TRUE;

    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
    {
	if (bufIsChanged(buf))
	{
	    /*
	     * Check if there is a reason the buffer cannot be written:
	     * 1. if the 'write' option is set
	     * 2. if there is no file name (even after browsing)
	     * 3. if the 'readonly' is set (even after a dialog)
	     * 4. if overwriting is allowed (even after a dialog)
	     */
	    if (not_writing())
	    {
		++error;
		break;
	    }
#ifdef FEAT_BROWSE
	    /* ":browse wall": ask for file name if there isn't one */
	    if (buf->b_ffname == NULL && cmdmod.browse)
		browse_save_fname(buf);
#endif
	    if (buf->b_ffname == NULL)
	    {
		EMSGN(_("E141: No file name for buffer %ld"), (long)buf->b_fnum);
		++error;
	    }
	    else if (check_readonly(&eap->forceit, buf)
		    || check_overwrite(eap, buf, buf->b_fname, buf->b_ffname,
							       FALSE) == FAIL)
	    {
		++error;
	    }
	    else
	    {
		if (buf_write_all(buf, eap->forceit) == FAIL)
		    ++error;
#ifdef FEAT_AUTOCMD
		/* an autocommand may have deleted the buffer */
		if (!buf_valid(buf))
		    buf = firstbuf;
#endif
	    }
	    eap->forceit = save_forceit;    /* check_overwrite() may set it */
	}
    }
    if (exiting)
    {
	if (!error)
	    getout(0);		/* exit Vim */
	not_exiting();
    }
}

/*
 * Check the 'write' option.
 * Return TRUE and give a message when it's not st.
 */
    int
not_writing()
{
    if (p_write)
	return FALSE;
    EMSG(_("E142: File not written: Writing is disabled by 'write' option"));
    return TRUE;
}

/*
 * Check if a buffer is read-only (either 'readonly' option is set or file is
 * read-only). Ask for overruling in a dialog. Return TRUE and give an error
 * message when the buffer is readonly.
 */
    static int
check_readonly(forceit, buf)
    int		*forceit;
    buf_T	*buf;
{
    struct stat	st;

    /* Handle a file being readonly when the 'readonly' option is set or when
     * the file exists and permissions are read-only.
     * We will send 0777 to check_file_readonly(), as the "perm" variable is
     * important for device checks but not here. */
    if (!*forceit && (buf->b_p_ro
		|| (mch_stat((char *)buf->b_ffname, &st) >= 0
		    && check_file_readonly(buf->b_ffname, 0777))))
    {
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
	if ((p_confirm || cmdmod.confirm) && buf->b_fname != NULL)
	{
	    char_u	buff[DIALOG_MSG_SIZE];

	    if (buf->b_p_ro)
		dialog_msg(buff, _("'readonly' option is set for \"%s\".\nDo you wish to write anyway?"),
		    buf->b_fname);
	    else
		dialog_msg(buff, _("File permissions of \"%s\" are read-only.\nIt may still be possible to write it.\nDo you wish to try?"),
		    buf->b_fname);

	    if (vim_dialog_yesno(VIM_QUESTION, NULL, buff, 2) == VIM_YES)
	    {
		/* Set forceit, to force the writing of a readonly file */
		*forceit = TRUE;
		return FALSE;
	    }
	    else
		return TRUE;
	}
	else
#endif
	if (buf->b_p_ro)
	    EMSG(_(e_readonly));
	else
	    EMSG2(_("E505: \"%s\" is read-only (add ! to override)"),
		    buf->b_fname);
	return TRUE;
    }

    return FALSE;
}

/*
 * Try to abandon current file and edit a new or existing file.
 * 'fnum' is the number of the file, if zero use ffname/sfname.
 *
 * Return 1 for "normal" error, 2 for "not written" error, 0 for success
 * -1 for successfully opening another file.
 * 'lnum' is the line number for the cursor in the new file (if non-zero).
 */
    int
getfile(fnum, ffname, sfname, setpm, lnum, forceit)
    int		fnum;
    char_u	*ffname;
    char_u	*sfname;
    int		setpm;
    linenr_T	lnum;
    int		forceit;
{
    int		other;
    int		retval;
    char_u	*free_me = NULL;

    if (text_locked())
	return 1;
#ifdef FEAT_AUTOCMD
    if (curbuf_locked())
	return 1;
#endif

    if (fnum == 0)
    {
					/* make ffname full path, set sfname */
	fname_expand(curbuf, &ffname, &sfname);
	other = otherfile(ffname);
	free_me = ffname;		/* has been allocated, free() later */
    }
    else
	other = (fnum != curbuf->b_fnum);

    if (other)
	++no_wait_return;	    /* don't wait for autowrite message */
    if (other && !forceit && curbuf->b_nwindows == 1 && !P_HID(curbuf)
		   && curbufIsChanged() && autowrite(curbuf, forceit) == FAIL)
    {
#if defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
	if (p_confirm && p_write)
	    dialog_changed(curbuf, FALSE);
	if (curbufIsChanged())
#endif
	{
	    if (other)
		--no_wait_return;
	    EMSG(_(e_nowrtmsg));
	    retval = 2;	/* file has been changed */
	    goto theend;
	}
    }
    if (other)
	--no_wait_return;
    if (setpm)
	setpcmark();
    if (!other)
    {
	if (lnum != 0)
	    curwin->w_cursor.lnum = lnum;
	check_cursor_lnum();
	beginline(BL_SOL | BL_FIX);
	retval = 0;	/* it's in the same file */
    }
    else if (do_ecmd(fnum, ffname, sfname, NULL, lnum,
		(P_HID(curbuf) ? ECMD_HIDE : 0) + (forceit ? ECMD_FORCEIT : 0),
		curwin) == OK)
	retval = -1;	/* opened another file */
    else
	retval = 1;	/* error encountered */

theend:
    vim_free(free_me);
    return retval;
}

/*
 * start editing a new file
 *
 *     fnum: file number; if zero use ffname/sfname
 *   ffname: the file name
 *		- full path if sfname used,
 *		- any file name if sfname is NULL
 *		- empty string to re-edit with the same file name (but may be
 *		    in a different directory)
 *		- NULL to start an empty buffer
 *   sfname: the short file name (or NULL)
 *	eap: contains the command to be executed after loading the file and
 *	     forced 'ff' and 'fenc'
 *  newlnum: if > 0: put cursor on this line number (if possible)
 *	     if ECMD_LASTL: use last position in loaded file
 *	     if ECMD_LAST: use last position in all files
 *	     if ECMD_ONE: use first line
 *    flags:
 *	   ECMD_HIDE: if TRUE don't free the current buffer
 *     ECMD_SET_HELP: set b_help flag of (new) buffer before opening file
 *	 ECMD_OLDBUF: use existing buffer if it exists
 *	ECMD_FORCEIT: ! used for Ex command
 *	 ECMD_ADDBUF: don't edit, just add to buffer list
 *   oldwin: Should be "curwin" when editing a new buffer in the current
 *	     window, NULL when splitting the window first.  When not NULL info
 *	     of the previous buffer for "oldwin" is stored.
 *
 * return FAIL for failure, OK otherwise
 */
    int
do_ecmd(fnum, ffname, sfname, eap, newlnum, flags, oldwin)
    int		fnum;
    char_u	*ffname;
    char_u	*sfname;
    exarg_T	*eap;			/* can be NULL! */
    linenr_T	newlnum;
    int		flags;
    win_T	*oldwin;
{
    int		other_file;		/* TRUE if editing another file */
    int		oldbuf;			/* TRUE if using existing buffer */
#ifdef FEAT_AUTOCMD
    int		auto_buf = FALSE;	/* TRUE if autocommands brought us
					   into the buffer unexpectedly */
    char_u	*new_name = NULL;
    int		did_set_swapcommand = FALSE;
#endif
    buf_T	*buf;
#if defined(FEAT_AUTOCMD) || defined(FEAT_GUI_DIALOG) || defined(FEAT_CON_DIALOG)
    buf_T	*old_curbuf = curbuf;
#endif
    char_u	*free_fname = NULL;
#ifdef FEAT_BROWSE
    char_u	*browse_file = NULL;
#endif
    int		retval = FAIL;
    long	n;
    linenr_T	lnum;
    linenr_T	topline = 0;
    int		newcol = -1;
    int		solcol = -1;
    pos_T	*pos;
#ifdef FEAT_SUN_WORKSHOP
    char_u	*cp;
#endif
    char_u	*command = NULL;
#ifdef FEAT_SPELL
    int		did_get_winopts = FALSE;
#endif
    int		readfile_flags = 0;

    if (eap != NULL)
	command = eap->do_ecmd_cmd;

    if (fnum != 0)
    {
	if (fnum == curbuf->b_fnum)	/* file is already being edited */
	    return OK;			/* nothing to do */
	other_file = TRUE;
    }
    else
    {
#ifdef FEAT_BROWSE
	if (cmdmod.browse)
	{
# ifdef FEAT_AUTOCMD
	    if (
#  ifdef FEAT_GUI
		!gui.in_use &&
#  endif
		    au_has_group((char_u *)"FileExplorer"))
	    {
		/* No browsing supported but we do have the file explorer:
		 * Edit the directory. */
		if (ffname == NULL || !mch_isdir(ffname))
		    ffname = (char_u *)".";
	    }
	    else
# endif
	    {
		browse_file = do_browse(0, (char_u *)_("Edit File"), ffname,
						    NULL, NULL, NULL, curbuf);
		if (browse_file == NULL)
		    goto theend;
		ffname = browse_file;
	    }
	}
#endif
	/* if no short name given, use ffname for short name */
	if (sfname == NULL)
	    sfname = ffname;
#ifdef USE_FNAME_CASE
# ifdef USE_LONG_FNAME
	if (USE_LONG_FNAME)
# endif
	    if (sfname != NULL)
		fname_case(sfname, 0);   /* set correct case for sfname */
#endif

#ifdef FEAT_LISTCMDS
	if ((flags & ECMD_ADDBUF) && (ffname == NULL || *ffname == NUL))
	    goto theend;
#endif

	if (ffname == NULL)
	    other_file = TRUE;
					    /* there is no file name */
	else if (*ffname == NUL && curbuf->b_ffname == NULL)
	    other_file = FALSE;
	else
	{
	    if (*ffname == NUL)		    /* re-edit with same file name */
	    {
		ffname = curbuf->b_ffname;
		sfname = curbuf->b_fname;
	    }
	    free_fname = fix_fname(ffname); /* may expand to full path name */
	    if (free_fname != NULL)
		ffname = free_fname;
	    other_file = otherfile(ffname);
#ifdef FEAT_SUN_WORKSHOP
	    if (usingSunWorkShop && p_acd
				   && (cp = vim_strrchr(sfname, '/')) != NULL)
		sfname = ++cp;
#endif
	}
    }

    /*
     * if the file was changed we may not be allowed to abandon it
     * - if we are going to re-edit the same file
     * - or if we are the only window on this file and if ECMD_HIDE is FALSE
     */
    if (  ((!other_file && !(flags & ECMD_OLDBUF))
	    || (curbuf->b_nwindows == 1
		&& !(flags & (ECMD_HIDE | ECMD_ADDBUF))))
	&& check_changed(curbuf, p_awa, !other_file,
					(flags & ECMD_FORCEIT), FALSE))
    {
	if (fnum == 0 && other_file && ffname != NULL)
	    (void)setaltfname(ffname, sfname, newlnum < 0 ? 0 : newlnum);
	goto theend;
    }

#ifdef FEAT_VISUAL
    /*
     * End Visual mode before switching to another buffer, so the text can be
     * copied into the GUI selection buffer.
     */
    reset_VIsual();
#endif

#ifdef FEAT_AUTOCMD
    if ((command != NULL || newlnum > (linenr_T)0)
	    && *get_vim_var_str(VV_SWAPCOMMAND) == NUL)
    {
	int	len;
	char_u	*p;

	/* Set v:swapcommand for the SwapExists autocommands. */
	if (command != NULL)
	    len = (int)STRLEN(command) + 3;
	else
	    len = 30;
	p = alloc((unsigned)len);
	if (p != NULL)
	{
	    if (command != NULL)
		vim_snprintf((char *)p, len, ":%s\r", command);
	    else
		vim_snprintf((char *)p, len, "%ldG", (long)newlnum);
	    set_vim_var_string(VV_SWAPCOMMAND, p, -1);
	    did_set_swapcommand = TRUE;
	    vim_free(p);
	}
    }
#endif

    /*
     * If we are starting to edit another file, open a (new) buffer.
     * Otherwise we re-use the current buffer.
     */
    if (other_file)
    {
#ifdef FEAT_LISTCMDS
	if (!(flags & ECMD_ADDBUF))
#endif
	{
	    if (!cmdmod.keepalt)
		curwin->w_alt_fnum = curbuf->b_fnum;
	    if (oldwin != NULL)
		buflist_altfpos(oldwin);
	}

	if (fnum)
	    buf = buflist_findnr(fnum);
	else
	{
#ifdef FEAT_LISTCMDS
	    if (flags & ECMD_ADDBUF)
	    {
		linenr_T	tlnum = 1L;

		if (command != NULL)
		{
		    tlnum = atol((char *)command);
		    if (tlnum <= 0)
			tlnum = 1L;
		}
		(void)buflist_new(ffname, sfname, tlnum, BLN_LISTED);
		goto theend;
	    }
#endif
	    buf = buflist_new(ffname, sfname, 0L,
		    BLN_CURBUF | ((flags & ECMD_SET_HELP) ? 0 : BLN_LISTED));
	}
	if (buf == NULL)
	    goto theend;
	if (buf->b_ml.ml_mfp == NULL)		/* no memfile yet */
	{
	    oldbuf = FALSE;
	    buf->b_nwindows = 0;
	}
	else					/* existing memfile */
	{
	    oldbuf = TRUE;
	    (void)buf_check_timestamp(buf, FALSE);
	    /* Check if autocommands made buffer invalid or changed the current
	     * buffer. */
	    if (!buf_valid(buf)
#ifdef FEAT_AUTOCMD
		    || curbuf != old_curbuf
#endif
		    )
		goto theend;
#ifdef FEAT_EVAL
	    if (aborting())	    /* autocmds may abort script processing */
		goto theend;
#endif
	}

	/* May jump to last used line number for a loaded buffer or when asked
	 * for explicitly */
	if ((oldbuf && newlnum == ECMD_LASTL) || newlnum == ECMD_LAST)
	{
	    pos = buflist_findfpos(buf);
	    newlnum = pos->lnum;
	    solcol = pos->col;
	}

	/*
	 * Make the (new) buffer the one used by the current window.
	 * If the old buffer becomes unused, free it if ECMD_HIDE is FALSE.
	 * If the current buffer was empty and has no file name, curbuf
	 * is returned by buflist_new().
	 */
	if (buf != curbuf)
	{
#ifdef FEAT_AUTOCMD
	    /*
	     * Be careful: The autocommands may delete any buffer and change
	     * the current buffer.
	     * - If the buffer we are going to edit is deleted, give up.
	     * - If the current buffer is deleted, prefer to load the new
	     *   buffer when loading a buffer is required.  This avoids
	     *   loading another buffer which then must be closed again.
	     * - If we ended up in the new buffer already, need to skip a few
	     *	 things, set auto_buf.
	     */
	    if (buf->b_fname != NULL)
		new_name = vim_strsave(buf->b_fname);
	    au_new_curbuf = buf;
	    apply_autocmds(EVENT_BUFLEAVE, NULL, NULL, FALSE, curbuf);
	    if (!buf_valid(buf))	/* new buffer has been deleted */
	    {
		delbuf_msg(new_name);	/* frees new_name */
		goto theend;
	    }
# ifdef FEAT_EVAL
	    if (aborting())	    /* autocmds may abort script processing */
	    {
		vim_free(new_name);
		goto theend;
	    }
# endif
	    if (buf == curbuf)		/* already in new buffer */
		auto_buf = TRUE;
	    else
	    {
		if (curbuf == old_curbuf)
#endif
		    buf_copy_options(buf, BCO_ENTER);

		/* close the link to the current buffer */
		u_sync(FALSE);
		close_buffer(oldwin, curbuf,
				      (flags & ECMD_HIDE) ? 0 : DOBUF_UNLOAD);

#ifdef FEAT_AUTOCMD
# ifdef FEAT_EVAL
		if (aborting())	    /* autocmds may abort script processing */
		{
		    vim_free(new_name);
		    goto theend;
		}
# endif
		/* Be careful again, like above. */
		if (!buf_valid(buf))	/* new buffer has been deleted */
		{
		    delbuf_msg(new_name);	/* frees new_name */
		    goto theend;
		}
		if (buf == curbuf)		/* already in new buffer */
		    auto_buf = TRUE;
		else
#endif
		{
#ifdef FEAT_SYN_HL
		    /*
		     * <VN> We could instead free the synblock
		     * and re-attach to buffer, perhaps.
		     */
		    if (curwin->w_s == &(curwin->w_buffer->b_s))
			    curwin->w_s = &(buf->b_s);
#endif
		    curwin->w_buffer = buf;
		    curbuf = buf;
		    ++curbuf->b_nwindows;
		    /* set 'fileformat' */
		    if (*p_ffs && !oldbuf)
			set_fileformat(default_fileformat(), OPT_LOCAL);
		}

		/* May get the window options from the last time this buffer
		 * was in this window (or another window).  If not used
		 * before, reset the local window options to the global
		 * values.  Also restores old folding stuff. */
		get_winopts(curbuf);
#ifdef FEAT_SPELL
		did_get_winopts = TRUE;
#endif

#ifdef FEAT_AUTOCMD
	    }
	    vim_free(new_name);
	    au_new_curbuf = NULL;
#endif
	}
	else
	    ++curbuf->b_nwindows;

	curwin->w_pcmark.lnum = 1;
	curwin->w_pcmark.col = 0;
    }
    else /* !other_file */
    {
	if (
#ifdef FEAT_LISTCMDS
		(flags & ECMD_ADDBUF) ||
#endif
		check_fname() == FAIL)
	    goto theend;
	oldbuf = (flags & ECMD_OLDBUF);
    }

    if ((flags & ECMD_SET_HELP) || keep_help_flag)
    {
	char_u	*p;

	curbuf->b_help = TRUE;
#ifdef FEAT_QUICKFIX
	set_string_option_direct((char_u *)"buftype", -1,
				     (char_u *)"help", OPT_FREE|OPT_LOCAL, 0);
#endif

	/*
	 * Always set these options after jumping to a help tag, because the
	 * user may have an autocommand that gets in the way.
	 * Accept all ASCII chars for keywords, except ' ', '*', '"', '|', and
	 * latin1 word characters (for translated help files).
	 * Only set it when needed, buf_init_chartab() is some work.
	 */
	p =
#ifdef EBCDIC
		(char_u *)"65-255,^*,^|,^\"";
#else
		(char_u *)"!-~,^*,^|,^\",192-255";
#endif
	if (STRCMP(curbuf->b_p_isk, p) != 0)
	{
	    set_string_option_direct((char_u *)"isk", -1, p,
						       OPT_FREE|OPT_LOCAL, 0);
	    check_buf_options(curbuf);
	    (void)buf_init_chartab(curbuf, FALSE);
	}

	curbuf->b_p_ts = 8;		/* 'tabstop' is 8 */
	curwin->w_p_list = FALSE;	/* no list mode */

	curbuf->b_p_ma = FALSE;		/* not modifiable */
	curbuf->b_p_bin = FALSE;	/* reset 'bin' before reading file */
	curwin->w_p_nu = 0;		/* no line numbers */
	curwin->w_p_rnu = 0;		/* no relative line numbers */
	RESET_BINDING(curwin);		/* no scroll or cursor binding */
#ifdef FEAT_ARABIC
	curwin->w_p_arab = FALSE;	/* no arabic mode */
#endif
#ifdef FEAT_RIGHTLEFT
	curwin->w_p_rl  = FALSE;	/* help window is left-to-right */
#endif
#ifdef FEAT_FOLDING
	curwin->w_p_fen = FALSE;	/* No folding in the help window */
#endif
#ifdef FEAT_DIFF
	curwin->w_p_diff = FALSE;	/* No 'diff' */
#endif
#ifdef FEAT_SPELL
	curwin->w_p_spell = FALSE;	/* No spell checking */
#endif

#ifdef FEAT_AUTOCMD
	buf = curbuf;
#endif
	set_buflisted(FALSE);
    }
    else
    {
#ifdef FEAT_AUTOCMD
	buf = curbuf;
#endif
	/* Don't make a buffer listed if it's a help buffer.  Useful when
	 * using CTRL-O to go back to a help file. */
	if (!curbuf->b_help)
	    set_buflisted(TRUE);
    }

#ifdef FEAT_AUTOCMD
    /* If autocommands change buffers under our fingers, forget about
     * editing the file. */
    if (buf != curbuf)
	goto theend;
# ifdef FEAT_EVAL
    if (aborting())	    /* autocmds may abort script processing */
	goto theend;
# endif

    /* Since we are starting to edit a file, consider the filetype to be
     * unset.  Helps for when an autocommand changes files and expects syntax
     * highlighting to work in the other file. */
    did_filetype = FALSE;
#endif

/*
 * other_file	oldbuf
 *  FALSE	FALSE	    re-edit same file, buffer is re-used
 *  FALSE	TRUE	    re-edit same file, nothing changes
 *  TRUE	FALSE	    start editing new file, new buffer
 *  TRUE	TRUE	    start editing in existing buffer (nothing to do)
 */
    if (!other_file && !oldbuf)		/* re-use the buffer */
    {
	set_last_cursor(curwin);	/* may set b_last_cursor */
	if (newlnum == ECMD_LAST || newlnum == ECMD_LASTL)
	{
	    newlnum = curwin->w_cursor.lnum;
	    solcol = curwin->w_cursor.col;
	}
#ifdef FEAT_AUTOCMD
	buf = curbuf;
	if (buf->b_fname != NULL)
	    new_name = vim_strsave(buf->b_fname);
	else
	    new_name = NULL;
#endif
	if (p_ur < 0 || curbuf->b_ml.ml_line_count <= p_ur)
	{
	    /* Save all the text, so that the reload can be undone.
	     * Sync first so that this is a separate undo-able action. */
	    u_sync(FALSE);
	    if (u_savecommon(0, curbuf->b_ml.ml_line_count + 1, 0, TRUE)
								     == FAIL)
		goto theend;
	    u_unchanged(curbuf);
	    buf_freeall(curbuf, BFA_KEEP_UNDO);

	    /* tell readfile() not to clear or reload undo info */
	    readfile_flags = READ_KEEP_UNDO;
	}
	else
	    buf_freeall(curbuf, 0);   /* free all things for buffer */
#ifdef FEAT_AUTOCMD
	/* If autocommands deleted the buffer we were going to re-edit, give
	 * up and jump to the end. */
	if (!buf_valid(buf))
	{
	    delbuf_msg(new_name);	/* frees new_name */
	    goto theend;
	}
	vim_free(new_name);

	/* If autocommands change buffers under our fingers, forget about
	 * re-editing the file.  Should do the buf_clear_file(), but perhaps
	 * the autocommands changed the buffer... */
	if (buf != curbuf)
	    goto theend;
# ifdef FEAT_EVAL
	if (aborting())	    /* autocmds may abort script processing */
	    goto theend;
# endif
#endif
	buf_clear_file(curbuf);
	curbuf->b_op_start.lnum = 0;	/* clear '[ and '] marks */
	curbuf->b_op_end.lnum = 0;
    }

/*
 * If we get here we are sure to start editing
 */
    /* don't redraw until the cursor is in the right line */
    ++RedrawingDisabled;

    /* Assume success now */
    retval = OK;

    /*
     * Reset cursor position, could be used by autocommands.
     */
    check_cursor();

    /*
     * Check if we are editing the w_arg_idx file in the argument list.
     */
    check_arg_idx(curwin);

#ifdef FEAT_SYN_HL
    reset_synblock(curwin);	    /* remove any ownsyntax */
#endif

#ifdef FEAT_AUTOCMD
    if (!auto_buf)
#endif
    {
	/*
	 * Set cursor and init window before reading the file and executing
	 * autocommands.  This allows for the autocommands to position the
	 * cursor.
	 */
	curwin_init();

#ifdef FEAT_FOLDING
	/* It's possible that all lines in the buffer changed.  Need to update
	 * automatic folding for all windows where it's used. */
# ifdef FEAT_WINDOWS
	{
	    win_T	    *win;
	    tabpage_T	    *tp;

	    FOR_ALL_TAB_WINDOWS(tp, win)
		if (win->w_buffer == curbuf)
		    foldUpdateAll(win);
	}
# else
	foldUpdateAll(curwin);
# endif
#endif

	/* Change directories when the 'acd' option is set. */
	DO_AUTOCHDIR

	/*
	 * Careful: open_buffer() and apply_autocmds() may change the current
	 * buffer and window.
	 */
	lnum = curwin->w_cursor.lnum;
	topline = curwin->w_topline;
	if (!oldbuf)			    /* need to read the file */
	{
#if defined(HAS_SWAP_EXISTS_ACTION)
	    swap_exists_action = SEA_DIALOG;
#endif
	    curbuf->b_flags |= BF_CHECK_RO; /* set/reset 'ro' flag */

	    /*
	     * Open the buffer and read the file.
	     */
#if defined(FEAT_AUTOCMD) && defined(FEAT_EVAL)
	    if (should_abort(open_buffer(FALSE, eap, readfile_flags)))
		retval = FAIL;
#else
	    (void)open_buffer(FALSE, eap, readfile_flags);
#endif

#if defined(HAS_SWAP_EXISTS_ACTION)
	    if (swap_exists_action == SEA_QUIT)
		retval = FAIL;
	    handle_swap_exists(old_curbuf);
#endif
	}
#ifdef FEAT_AUTOCMD
	else
	{
	    /* Read the modelines, but only to set window-local options.  Any
	     * buffer-local options have already been set and may have been
	     * changed by the user. */
	    do_modelines(OPT_WINONLY);

	    apply_autocmds_retval(EVENT_BUFENTER, NULL, NULL, FALSE, curbuf,
								    &retval);
	    apply_autocmds_retval(EVENT_BUFWINENTER, NULL, NULL, FALSE, curbuf,
								    &retval);
	}
	check_arg_idx(curwin);
#endif

	/*
	 * If autocommands change the cursor position or topline, we should
	 * keep it.
	 */
	if (curwin->w_cursor.lnum != lnum)
	{
	    newlnum = curwin->w_cursor.lnum;
	    newcol = curwin->w_cursor.col;
	}
	if (curwin->w_topline == topline)
	    topline = 0;

	/* Even when cursor didn't move we need to recompute topline. */
	changed_line_abv_curs();

#ifdef FEAT_TITLE
	maketitle();
#endif
    }

#ifdef FEAT_DIFF
    /* Tell the diff stuff that this buffer is new and/or needs updating.
     * Also needed when re-editing the same buffer, because unloading will
     * have removed it as a diff buffer. */
    if (curwin->w_p_diff)
    {
	diff_buf_add(curbuf);
	diff_invalidate(curbuf);
    }
#endif

#ifdef FEAT_SPELL
    /* If the window options were changed may need to set the spell language.
     * Can only do this after the buffer has been properly setup. */
    if (did_get_winopts && curwin->w_p_spell && *curwin->w_s->b_p_spl != NUL)
	(void)did_set_spelllang(curwin);
#endif

    if (command == NULL)
    {
	if (newcol >= 0)	/* position set by autocommands */
	{
	    curwin->w_cursor.lnum = newlnum;
	    curwin->w_cursor.col = newcol;
	    check_cursor();
	}
	else if (newlnum > 0)	/* line number from caller or old position */
	{
	    curwin->w_cursor.lnum = newlnum;
	    check_cursor_lnum();
	    if (solcol >= 0 && !p_sol)
	    {
		/* 'sol' is off: Use last known column. */
		curwin->w_cursor.col = solcol;
		check_cursor_col();
#ifdef FEAT_VIRTUALEDIT
		curwin->w_cursor.coladd = 0;
#endif
		curwin->w_set_curswant = TRUE;
	    }
	    else
		beginline(BL_SOL | BL_FIX);
	}
	else			/* no line number, go to last line in Ex mode */
	{
	    if (exmode_active)
		curwin->w_cursor.lnum = curbuf->b_ml.ml_line_count;
	    beginline(BL_WHITE | BL_FIX);
	}
    }

#ifdef FEAT_WINDOWS
    /* Check if cursors in other windows on the same buffer are still valid */
    check_lnums(FALSE);
#endif

    /*
     * Did not read the file, need to show some info about the file.
     * Do this after setting the cursor.
     */
    if (oldbuf
#ifdef FEAT_AUTOCMD
		&& !auto_buf
#endif
			    )
    {
	int	msg_scroll_save = msg_scroll;

	/* Obey the 'O' flag in 'cpoptions': overwrite any previous file
	 * message. */
	if (shortmess(SHM_OVERALL) && !exiting && p_verbose == 0)
	    msg_scroll = FALSE;
	if (!msg_scroll)	/* wait a bit when overwriting an error msg */
	    check_for_delay(FALSE);
	msg_start();
	msg_scroll = msg_scroll_save;
	msg_scrolled_ign = TRUE;

	fileinfo(FALSE, TRUE, FALSE);

	msg_scrolled_ign = FALSE;
    }

    if (command != NULL)
	do_cmdline(command, NULL, NULL, DOCMD_VERBOSE);

#ifdef FEAT_KEYMAP
    if (curbuf->b_kmap_state & KEYMAP_INIT)
	(void)keymap_init();
#endif

    --RedrawingDisabled;
    if (!skip_redraw)
    {
	n = p_so;
	if (topline == 0 && command == NULL)
	    p_so = 999;			/* force cursor halfway the window */
	update_topline();
#ifdef FEAT_SCROLLBIND
	curwin->w_scbind_pos = curwin->w_topline;
#endif
	p_so = n;
	redraw_curbuf_later(NOT_VALID);	/* redraw this buffer later */
    }

    if (p_im)
	need_start_insertmode = TRUE;

    /* Change directories when the 'acd' option is set. */
    DO_AUTOCHDIR

#if defined(FEAT_SUN_WORKSHOP) || defined(FEAT_NETBEANS_INTG)
    if (curbuf->b_ffname != NULL)
    {
# ifdef FEAT_SUN_WORKSHOP
	if (gui.in_use && usingSunWorkShop)
	    workshop_file_opened((char *)curbuf->b_ffname, curbuf->b_p_ro);
# endif
# ifdef FEAT_NETBEANS_INTG
	if ((flags & ECMD_SET_HELP) != ECMD_SET_HELP)
	    netbeans_file_opened(curbuf);
# endif
    }
#endif

theend:
#ifdef FEAT_AUTOCMD
    if (did_set_swapcommand)
	set_vim_var_string(VV_SWAPCOMMAND, NULL, -1);
#endif
#ifdef FEAT_BROWSE
    vim_free(browse_file);
#endif
    vim_free(free_fname);
    return retval;
}

#ifdef FEAT_AUTOCMD
    static void
delbuf_msg(name)
    char_u	*name;
{
    EMSG2(_("E143: Autocommands unexpectedly deleted new buffer %s"),
	    name == NULL ? (char_u *)"" : name);
    vim_free(name);
    au_new_curbuf = NULL;
}
#endif

static int append_indent = 0;	    /* autoindent for first line */

/*
 * ":insert" and ":append", also used by ":change"
 */
    void
ex_append(eap)
    exarg_T	*eap;
{
    char_u	*theline;
    int		did_undo = FALSE;
    linenr_T	lnum = eap->line2;
    int		indent = 0;
    char_u	*p;
    int		vcol;
    int		empty = (curbuf->b_ml.ml_flags & ML_EMPTY);

    /* the ! flag toggles autoindent */
    if (eap->forceit)
	curbuf->b_p_ai = !curbuf->b_p_ai;

    /* First autoindent comes from the line we start on */
    if (eap->cmdidx != CMD_change && curbuf->b_p_ai && lnum > 0)
	append_indent = get_indent_lnum(lnum);

    if (eap->cmdidx != CMD_append)
	--lnum;

    /* when the buffer is empty append to line 0 and delete the dummy line */
    if (empty && lnum == 1)
	lnum = 0;

    State = INSERT;		    /* behave like in Insert mode */
    if (curbuf->b_p_iminsert == B_IMODE_LMAP)
	State |= LANGMAP;

    for (;;)
    {
	msg_scroll = TRUE;
	need_wait_return = FALSE;
	if (curbuf->b_p_ai)
	{
	    if (append_indent >= 0)
	    {
		indent = append_indent;
		append_indent = -1;
	    }
	    else if (lnum > 0)
		indent = get_indent_lnum(lnum);
	}
	ex_keep_indent = FALSE;
	if (eap->getline == NULL)
	{
	    /* No getline() function, use the lines that follow. This ends
	     * when there is no more. */
	    if (eap->nextcmd == NULL || *eap->nextcmd == NUL)
		break;
	    p = vim_strchr(eap->nextcmd, NL);
	    if (p == NULL)
		p = eap->nextcmd + STRLEN(eap->nextcmd);
	    theline = vim_strnsave(eap->nextcmd, (int)(p - eap->nextcmd));
	    if (*p != NUL)
		++p;
	    eap->nextcmd = p;
	}
	else
	    theline = eap->getline(
#ifdef FEAT_EVAL
		    eap->cstack->cs_looplevel > 0 ? -1 :
#endif
		    NUL, eap->cookie, indent);
	lines_left = Rows - 1;
	if (theline == NULL)
	    break;

	/* Using ^ CTRL-D in getexmodeline() makes us repeat the indent. */
	if (ex_keep_indent)
	    append_indent = indent;

	/* Look for the "." after automatic indent. */
	vcol = 0;
	for (p = theline; indent > vcol; ++p)
	{
	    if (*p == ' ')
		++vcol;
	    else if (*p == TAB)
		vcol += 8 - vcol % 8;
	    else
		break;
	}
	if ((p[0] == '.' && p[1] == NUL)
		|| (!did_undo && u_save(lnum, lnum + 1 + (empty ? 1 : 0))
								     == FAIL))
	{
	    vim_free(theline);
	    break;
	}

	/* don't use autoindent if nothing was typed. */
	if (p[0] == NUL)
	    theline[0] = NUL;

	did_undo = TRUE;
	ml_append(lnum, theline, (colnr_T)0, FALSE);
	appended_lines_mark(lnum, 1L);

	vim_free(theline);
	++lnum;

	if (empty)
	{
	    ml_delete(2L, FALSE);
	    empty = FALSE;
	}
    }
    State = NORMAL;

    if (eap->forceit)
	curbuf->b_p_ai = !curbuf->b_p_ai;

    /* "start" is set to eap->line2+1 unless that position is invalid (when
     * eap->line2 pointed to the end of the buffer and nothing was appended)
     * "end" is set to lnum when something has been appended, otherwise
     * it is the same than "start"  -- Acevedo */
    curbuf->b_op_start.lnum = (eap->line2 < curbuf->b_ml.ml_line_count) ?
	eap->line2 + 1 : curbuf->b_ml.ml_line_count;
    if (eap->cmdidx != CMD_append)
	--curbuf->b_op_start.lnum;
    curbuf->b_op_end.lnum = (eap->line2 < lnum)
					     ? lnum : curbuf->b_op_start.lnum;
    curbuf->b_op_start.col = curbuf->b_op_end.col = 0;
    curwin->w_cursor.lnum = lnum;
    check_cursor_lnum();
    beginline(BL_SOL | BL_FIX);

    need_wait_return = FALSE;	/* don't use wait_return() now */
    ex_no_reprint = TRUE;
}

/*
 * ":change"
 */
    void
ex_change(eap)
    exarg_T	*eap;
{
    linenr_T	lnum;

    if (eap->line2 >= eap->line1
	    && u_save(eap->line1 - 1, eap->line2 + 1) == FAIL)
	return;

    /* the ! flag toggles autoindent */
    if (eap->forceit ? !curbuf->b_p_ai : curbuf->b_p_ai)
	append_indent = get_indent_lnum(eap->line1);

    for (lnum = eap->line2; lnum >= eap->line1; --lnum)
    {
	if (curbuf->b_ml.ml_flags & ML_EMPTY)	    /* nothing to delete */
	    break;
	ml_delete(eap->line1, FALSE);
    }

    /* make sure the cursor is not beyond the end of the file now */
    check_cursor_lnum();
    deleted_lines_mark(eap->line1, (long)(eap->line2 - lnum));

    /* ":append" on the line above the deleted lines. */
    eap->line2 = eap->line1;
    ex_append(eap);
}

    void
ex_z(eap)
    exarg_T	*eap;
{
    char_u	*x;
    int		bigness;
    char_u	*kind;
    int		minus = 0;
    linenr_T	start, end, curs, i;
    int		j;
    linenr_T	lnum = eap->line2;

    /* Vi compatible: ":z!" uses display height, without a count uses
     * 'scroll' */
    if (eap->forceit)
	bigness = curwin->w_height;
    else if (firstwin == lastwin)
	bigness = curwin->w_p_scr * 2;
#ifdef FEAT_WINDOWS
    else
	bigness = curwin->w_height - 3;
#endif
    if (bigness < 1)
	bigness = 1;

    x = eap->arg;
    kind = x;
    if (*kind == '-' || *kind == '+' || *kind == '='
					      || *kind == '^' || *kind == '.')
	++x;
    while (*x == '-' || *x == '+')
	++x;

    if (*x != 0)
    {
	if (!VIM_ISDIGIT(*x))
	{
	    EMSG(_("E144: non-numeric argument to :z"));
	    return;
	}
	else
	{
	    bigness = atoi((char *)x);
	    p_window = bigness;
	    if (*kind == '=')
		bigness += 2;
	}
    }

    /* the number of '-' and '+' multiplies the distance */
    if (*kind == '-' || *kind == '+')
	for (x = kind + 1; *x == *kind; ++x)
	    ;

    switch (*kind)
    {
	case '-':
	    start = lnum - bigness * (linenr_T)(x - kind) + 1;
	    end = start + bigness - 1;
	    curs = end;
	    break;

	case '=':
	    start = lnum - (bigness + 1) / 2 + 1;
	    end = lnum + (bigness + 1) / 2 - 1;
	    curs = lnum;
	    minus = 1;
	    break;

	case '^':
	    start = lnum - bigness * 2;
	    end = lnum - bigness;
	    curs = lnum - bigness;
	    break;

	case '.':
	    start = lnum - (bigness + 1) / 2 + 1;
	    end = lnum + (bigness + 1) / 2 - 1;
	    curs = end;
	    break;

	default:  /* '+' */
	    start = lnum;
	    if (*kind == '+')
		start += bigness * (linenr_T)(x - kind - 1) + 1;
	    else if (eap->addr_count == 0)
		++start;
	    end = start + bigness - 1;
	    curs = end;
	    break;
    }

    if (start < 1)
	start = 1;

    if (end > curbuf->b_ml.ml_line_count)
	end = curbuf->b_ml.ml_line_count;

    if (curs > curbuf->b_ml.ml_line_count)
	curs = curbuf->b_ml.ml_line_count;

    for (i = start; i <= end; i++)
    {
	if (minus && i == lnum)
	{
	    msg_putchar('\n');

	    for (j = 1; j < Columns; j++)
		msg_putchar('-');
	}

	print_line(i, eap->flags & EXFLAG_NR, eap->flags & EXFLAG_LIST);

	if (minus && i == lnum)
	{
	    msg_putchar('\n');

	    for (j = 1; j < Columns; j++)
		msg_putchar('-');
	}
    }

    curwin->w_cursor.lnum = curs;
    ex_no_reprint = TRUE;
}

/*
 * Check if the restricted flag is set.
 * If so, give an error message and return TRUE.
 * Otherwise, return FALSE.
 */
    int
check_restricted()
{
    if (restricted)
    {
	EMSG(_("E145: Shell commands not allowed in rvim"));
	return TRUE;
    }
    return FALSE;
}

/*
 * Check if the secure flag is set (.exrc or .vimrc in current directory).
 * If so, give an error message and return TRUE.
 * Otherwise, return FALSE.
 */
    int
check_secure()
{
    if (secure)
    {
	secure = 2;
	EMSG(_(e_curdir));
	return TRUE;
    }
#ifdef HAVE_SANDBOX
    /*
     * In the sandbox more things are not allowed, including the things
     * disallowed in secure mode.
     */
    if (sandbox != 0)
    {
	EMSG(_(e_sandbox));
	return TRUE;
    }
#endif
    return FALSE;
}

static char_u	*old_sub = NULL;	/* previous substitute pattern */
static int	global_need_beginline;	/* call beginline() after ":g" */

/* do_sub()
 *
 * Perform a substitution from line eap->line1 to line eap->line2 using the
 * command pointed to by eap->arg which should be of the form:
 *
 * /pattern/substitution/{flags}
 *
 * The usual escapes are supported as described in the regexp docs.
 */
    void
do_sub(eap)
    exarg_T	*eap;
{
    linenr_T	lnum;
    long	i = 0;
    regmmatch_T regmatch;
    static int	do_all = FALSE;		/* do multiple substitutions per line */
    static int	do_ask = FALSE;		/* ask for confirmation */
    static int	do_count = FALSE;	/* count only */
    static int	do_error = TRUE;	/* if false, ignore errors */
    static int	do_print = FALSE;	/* print last line with subs. */
    static int	do_list = FALSE;	/* list last line with subs. */
    static int	do_number = FALSE;	/* list last line with line nr*/
    static int	do_ic = 0;		/* ignore case flag */
    char_u	*pat = NULL, *sub = NULL;	/* init for GCC */
    int		delimiter;
    int		sublen;
    int		got_quit = FALSE;
    int		got_match = FALSE;
    int		temp;
    int		which_pat;
    char_u	*cmd;
    int		save_State;
    linenr_T	first_line = 0;		/* first changed line */
    linenr_T	last_line= 0;		/* below last changed line AFTER the
					 * change */
    linenr_T	old_line_count = curbuf->b_ml.ml_line_count;
    linenr_T	line2;
    long	nmatch;			/* number of lines in match */
    char_u	*sub_firstline;		/* allocated copy of first sub line */
    int		endcolumn = FALSE;	/* cursor in last column when done */
    pos_T	old_cursor = curwin->w_cursor;
    int		start_nsubs;

    cmd = eap->arg;
    if (!global_busy)
    {
	sub_nsubs = 0;
	sub_nlines = 0;
    }
    start_nsubs = sub_nsubs;

    if (eap->cmdidx == CMD_tilde)
	which_pat = RE_LAST;	/* use last used regexp */
    else
	which_pat = RE_SUBST;	/* use last substitute regexp */

				/* new pattern and substitution */
    if (eap->cmd[0] == 's' && *cmd != NUL && !vim_iswhite(*cmd)
		&& vim_strchr((char_u *)"0123456789cegriIp|\"", *cmd) == NULL)
    {
				/* don't accept alphanumeric for separator */
	if (isalpha(*cmd))
	{
	    EMSG(_("E146: Regular expressions can't be delimited by letters"));
	    return;
	}
	/*
	 * undocumented vi feature:
	 *  "\/sub/" and "\?sub?" use last used search pattern (almost like
	 *  //sub/r).  "\&sub&" use last substitute pattern (like //sub/).
	 */
	if (*cmd == '\\')
	{
	    ++cmd;
	    if (vim_strchr((char_u *)"/?&", *cmd) == NULL)
	    {
		EMSG(_(e_backslash));
		return;
	    }
	    if (*cmd != '&')
		which_pat = RE_SEARCH;	    /* use last '/' pattern */
	    pat = (char_u *)"";		    /* empty search pattern */
	    delimiter = *cmd++;		    /* remember delimiter character */
	}
	else		/* find the end of the regexp */
	{
#ifdef FEAT_FKMAP	/* reverse the flow of the Farsi characters */
	    if (p_altkeymap && curwin->w_p_rl)
		lrF_sub(cmd);
#endif
	    which_pat = RE_LAST;	    /* use last used regexp */
	    delimiter = *cmd++;		    /* remember delimiter character */
	    pat = cmd;			    /* remember start of search pat */
	    cmd = skip_regexp(cmd, delimiter, p_magic, &eap->arg);
	    if (cmd[0] == delimiter)	    /* end delimiter found */
		*cmd++ = NUL;		    /* replace it with a NUL */
	}

	/*
	 * Small incompatibility: vi sees '\n' as end of the command, but in
	 * Vim we want to use '\n' to find/substitute a NUL.
	 */
	sub = cmd;	    /* remember the start of the substitution */

	while (cmd[0])
	{
	    if (cmd[0] == delimiter)		/* end delimiter found */
	    {
		*cmd++ = NUL;			/* replace it with a NUL */
		break;
	    }
	    if (cmd[0] == '\\' && cmd[1] != 0)	/* skip escaped characters */
		++cmd;
	    mb_ptr_adv(cmd);
	}

	if (!eap->skip)
	{
	    /* In POSIX vi ":s/pat/%/" uses the previous subst. string. */
	    if (STRCMP(sub, "%") == 0
				 && vim_strchr(p_cpo, CPO_SUBPERCENT) != NULL)
	    {
		if (old_sub == NULL)	/* there is no previous command */
		{
		    EMSG(_(e_nopresub));
		    return;
		}
		sub = old_sub;
	    }
	    else
	    {
		vim_free(old_sub);
		old_sub = vim_strsave(sub);
	    }
	}
    }
    else if (!eap->skip)	/* use previous pattern and substitution */
    {
	if (old_sub == NULL)	/* there is no previous command */
	{
	    EMSG(_(e_nopresub));
	    return;
	}
	pat = NULL;		/* search_regcomp() will use previous pattern */
	sub = old_sub;

	/* Vi compatibility quirk: repeating with ":s" keeps the cursor in the
	 * last column after using "$". */
	endcolumn = (curwin->w_curswant == MAXCOL);
    }

    /*
     * Find trailing options.  When '&' is used, keep old options.
     */
    if (*cmd == '&')
	++cmd;
    else
    {
	if (!p_ed)
	{
	    if (p_gd)		/* default is global on */
		do_all = TRUE;
	    else
		do_all = FALSE;
	    do_ask = FALSE;
	}
	do_error = TRUE;
	do_print = FALSE;
	do_count = FALSE;
	do_number = FALSE;
	do_ic = 0;
    }
    while (*cmd)
    {
	/*
	 * Note that 'g' and 'c' are always inverted, also when p_ed is off.
	 * 'r' is never inverted.
	 */
	if (*cmd == 'g')
	    do_all = !do_all;
	else if (*cmd == 'c')
	    do_ask = !do_ask;
	else if (*cmd == 'n')
	    do_count = TRUE;
	else if (*cmd == 'e')
	    do_error = !do_error;
	else if (*cmd == 'r')	    /* use last used regexp */
	    which_pat = RE_LAST;
	else if (*cmd == 'p')
	    do_print = TRUE;
	else if (*cmd == '#')
	{
	    do_print = TRUE;
	    do_number = TRUE;
	}
	else if (*cmd == 'l')
	{
	    do_print = TRUE;
	    do_list = TRUE;
	}
	else if (*cmd == 'i')	    /* ignore case */
	    do_ic = 'i';
	else if (*cmd == 'I')	    /* don't ignore case */
	    do_ic = 'I';
	else
	    break;
	++cmd;
    }
    if (do_count)
	do_ask = FALSE;

    /*
     * check for a trailing count
     */
    cmd = skipwhite(cmd);
    if (VIM_ISDIGIT(*cmd))
    {
	i = getdigits(&cmd);
	if (i <= 0 && !eap->skip && do_error)
	{
	    EMSG(_(e_zerocount));
	    return;
	}
	eap->line1 = eap->line2;
	eap->line2 += i - 1;
	if (eap->line2 > curbuf->b_ml.ml_line_count)
	    eap->line2 = curbuf->b_ml.ml_line_count;
    }

    /*
     * check for trailing command or garbage
     */
    cmd = skipwhite(cmd);
    if (*cmd && *cmd != '"')	    /* if not end-of-line or comment */
    {
	eap->nextcmd = check_nextcmd(cmd);
	if (eap->nextcmd == NULL)
	{
	    EMSG(_(e_trailing));
	    return;
	}
    }

    if (eap->skip)	    /* not executing commands, only parsing */
	return;

    if (!do_count && !curbuf->b_p_ma)
    {
	/* Substitution is not allowed in non-'modifiable' buffer */
	EMSG(_(e_modifiable));
	return;
    }

    if (search_regcomp(pat, RE_SUBST, which_pat, SEARCH_HIS, &regmatch) == FAIL)
    {
	if (do_error)
	    EMSG(_(e_invcmd));
	return;
    }

    /* the 'i' or 'I' flag overrules 'ignorecase' and 'smartcase' */
    if (do_ic == 'i')
	regmatch.rmm_ic = TRUE;
    else if (do_ic == 'I')
	regmatch.rmm_ic = FALSE;

    sub_firstline = NULL;

    /*
     * ~ in the substitute pattern is replaced with the old pattern.
     * We do it here once to avoid it to be replaced over and over again.
     * But don't do it when it starts with "\=", then it's an expression.
     */
    if (!(sub[0] == '\\' && sub[1] == '='))
	sub = regtilde(sub, p_magic);

    /*
     * Check for a match on each line.
     */
    line2 = eap->line2;
    for (lnum = eap->line1; lnum <= line2 && !(got_quit
#if defined(FEAT_EVAL) && defined(FEAT_AUTOCMD)
		|| aborting()
#endif
		); ++lnum)
    {
	nmatch = vim_regexec_multi(&regmatch, curwin, curbuf, lnum,
							    (colnr_T)0, NULL);
	if (nmatch)
	{
	    colnr_T	copycol;
	    colnr_T	matchcol;
	    colnr_T	prev_matchcol = MAXCOL;
	    char_u	*new_end, *new_start = NULL;
	    unsigned	new_start_len = 0;
	    char_u	*p1;
	    int		did_sub = FALSE;
	    int		lastone;
	    int		len, copy_len, needed_len;
	    long	nmatch_tl = 0;	/* nr of lines matched below lnum */
	    int		do_again;	/* do it again after joining lines */
	    int		skip_match = FALSE;
	    linenr_T	sub_firstlnum;	/* nr of first sub line */

	    /*
	     * The new text is build up step by step, to avoid too much
	     * copying.  There are these pieces:
	     * sub_firstline	The old text, unmodified.
	     * copycol		Column in the old text where we started
	     *			looking for a match; from here old text still
	     *			needs to be copied to the new text.
	     * matchcol		Column number of the old text where to look
	     *			for the next match.  It's just after the
	     *			previous match or one further.
	     * prev_matchcol	Column just after the previous match (if any).
	     *			Mostly equal to matchcol, except for the first
	     *			match and after skipping an empty match.
	     * regmatch.*pos	Where the pattern matched in the old text.
	     * new_start	The new text, all that has been produced so
	     *			far.
	     * new_end		The new text, where to append new text.
	     *
	     * lnum		The line number where we found the start of
	     *			the match.  Can be below the line we searched
	     *			when there is a \n before a \zs in the
	     *			pattern.
	     * sub_firstlnum	The line number in the buffer where to look
	     *			for a match.  Can be different from "lnum"
	     *			when the pattern or substitute string contains
	     *			line breaks.
	     *
	     * Special situations:
	     * - When the substitute string contains a line break, the part up
	     *   to the line break is inserted in the text, but the copy of
	     *   the original line is kept.  "sub_firstlnum" is adjusted for
	     *   the inserted lines.
	     * - When the matched pattern contains a line break, the old line
	     *   is taken from the line at the end of the pattern.  The lines
	     *   in the match are deleted later, "sub_firstlnum" is adjusted
	     *   accordingly.
	     *
	     * The new text is built up in new_start[].  It has some extra
	     * room to avoid using alloc()/free() too often.  new_start_len is
	     * the length of the allocated memory at new_start.
	     *
	     * Make a copy of the old line, so it won't be taken away when
	     * updating the screen or handling a multi-line match.  The "old_"
	     * pointers point into this copy.
	     */
	    sub_firstlnum = lnum;
	    copycol = 0;
	    matchcol = 0;

	    /* At first match, remember current cursor position. */
	    if (!got_match)
	    {
		setpcmark();
		got_match = TRUE;
	    }

	    /*
	     * Loop until nothing more to replace in this line.
	     * 1. Handle match with empty string.
	     * 2. If do_ask is set, ask for confirmation.
	     * 3. substitute the string.
	     * 4. if do_all is set, find next match
	     * 5. break if there isn't another match in this line
	     */
	    for (;;)
	    {
		/* Advance "lnum" to the line where the match starts.  The
		 * match does not start in the first line when there is a line
		 * break before \zs. */
		if (regmatch.startpos[0].lnum > 0)
		{
		    lnum += regmatch.startpos[0].lnum;
		    sub_firstlnum += regmatch.startpos[0].lnum;
		    nmatch -= regmatch.startpos[0].lnum;
		    vim_free(sub_firstline);
		    sub_firstline = NULL;
		}

		if (sub_firstline == NULL)
		{
		    sub_firstline = vim_strsave(ml_get(sub_firstlnum));
		    if (sub_firstline == NULL)
		    {
			vim_free(new_start);
			goto outofmem;
		    }
		}

		/* Save the line number of the last change for the final
		 * cursor position (just like Vi). */
		curwin->w_cursor.lnum = lnum;
		do_again = FALSE;

		/*
		 * 1. Match empty string does not count, except for first
		 * match.  This reproduces the strange vi behaviour.
		 * This also catches endless loops.
		 */
		if (matchcol == prev_matchcol
			&& regmatch.endpos[0].lnum == 0
			&& matchcol == regmatch.endpos[0].col)
		{
		    if (sub_firstline[matchcol] == NUL)
			/* We already were at the end of the line.  Don't look
			 * for a match in this line again. */
			skip_match = TRUE;
		    else
		    {
			 /* search for a match at next column */
#ifdef FEAT_MBYTE
			if (has_mbyte)
			    matchcol += mb_ptr2len(sub_firstline + matchcol);
			else
#endif
			    ++matchcol;
		    }
		    goto skip;
		}

		/* Normally we continue searching for a match just after the
		 * previous match. */
		matchcol = regmatch.endpos[0].col;
		prev_matchcol = matchcol;

		/*
		 * 2. If do_count is set only increase the counter.
		 *    If do_ask is set, ask for confirmation.
		 */
		if (do_count)
		{
		    /* For a multi-line match, put matchcol at the NUL at
		     * the end of the line and set nmatch to one, so that
		     * we continue looking for a match on the next line.
		     * Avoids that ":s/\nB\@=//gc" get stuck. */
		    if (nmatch > 1)
		    {
			matchcol = (colnr_T)STRLEN(sub_firstline);
			nmatch = 1;
			skip_match = TRUE;
		    }
		    sub_nsubs++;
		    did_sub = TRUE;
		    goto skip;
		}

		if (do_ask)
		{
		    int typed = 0;

		    /* change State to CONFIRM, so that the mouse works
		     * properly */
		    save_State = State;
		    State = CONFIRM;
#ifdef FEAT_MOUSE
		    setmouse();		/* disable mouse in xterm */
#endif
		    curwin->w_cursor.col = regmatch.startpos[0].col;

		    /* When 'cpoptions' contains "u" don't sync undo when
		     * asking for confirmation. */
		    if (vim_strchr(p_cpo, CPO_UNDO) != NULL)
			++no_u_sync;

		    /*
		     * Loop until 'y', 'n', 'q', CTRL-E or CTRL-Y typed.
		     */
		    while (do_ask)
		    {
			if (exmode_active)
			{
			    char_u	*resp;
			    colnr_T	sc, ec;

			    print_line_no_prefix(lnum, FALSE, FALSE);

			    getvcol(curwin, &curwin->w_cursor, &sc, NULL, NULL);
			    curwin->w_cursor.col = regmatch.endpos[0].col - 1;
			    getvcol(curwin, &curwin->w_cursor, NULL, NULL, &ec);
			    msg_start();
			    for (i = 0; i < (long)sc; ++i)
				msg_putchar(' ');
			    for ( ; i <= (long)ec; ++i)
				msg_putchar('^');

			    resp = getexmodeline('?', NULL, 0);
			    if (resp != NULL)
			    {
				typed = *resp;
				vim_free(resp);
			    }
			}
			else
			{
#ifdef FEAT_FOLDING
			    int save_p_fen = curwin->w_p_fen;

			    curwin->w_p_fen = FALSE;
#endif
			    /* Invert the matched string.
			     * Remove the inversion afterwards. */
			    temp = RedrawingDisabled;
			    RedrawingDisabled = 0;

			    search_match_lines = regmatch.endpos[0].lnum
						  - regmatch.startpos[0].lnum;
			    search_match_endcol = regmatch.endpos[0].col;
			    highlight_match = TRUE;

			    update_topline();
			    validate_cursor();
			    update_screen(SOME_VALID);
			    highlight_match = FALSE;
			    redraw_later(SOME_VALID);

#ifdef FEAT_FOLDING
			    curwin->w_p_fen = save_p_fen;
#endif
			    if (msg_row == Rows - 1)
				msg_didout = FALSE;	/* avoid a scroll-up */
			    msg_starthere();
			    i = msg_scroll;
			    msg_scroll = 0;		/* truncate msg when
							   needed */
			    msg_no_more = TRUE;
			    /* write message same highlighting as for
			     * wait_return */
			    smsg_attr(hl_attr(HLF_R),
				    (char_u *)_("replace with %s (y/n/a/q/l/^E/^Y)?"), sub);
			    msg_no_more = FALSE;
			    msg_scroll = i;
			    showruler(TRUE);
			    windgoto(msg_row, msg_col);
			    RedrawingDisabled = temp;

#ifdef USE_ON_FLY_SCROLL
			    dont_scroll = FALSE; /* allow scrolling here */
#endif
			    ++no_mapping;	/* don't map this key */
			    ++allow_keys;	/* allow special keys */
			    typed = plain_vgetc();
			    --allow_keys;
			    --no_mapping;

			    /* clear the question */
			    msg_didout = FALSE;	/* don't scroll up */
			    msg_col = 0;
			    gotocmdline(TRUE);
			}

			need_wait_return = FALSE; /* no hit-return prompt */
			if (typed == 'q' || typed == ESC || typed == Ctrl_C
#ifdef UNIX
				|| typed == intr_char
#endif
				)
			{
			    got_quit = TRUE;
			    break;
			}
			if (typed == 'n')
			    break;
			if (typed == 'y')
			    break;
			if (typed == 'l')
			{
			    /* last: replace and then stop */
			    do_all = FALSE;
			    line2 = lnum;
			    break;
			}
			if (typed == 'a')
			{
			    do_ask = FALSE;
			    break;
			}
#ifdef FEAT_INS_EXPAND
			if (typed == Ctrl_E)
			    scrollup_clamp();
			else if (typed == Ctrl_Y)
			    scrolldown_clamp();
#endif
		    }
		    State = save_State;
#ifdef FEAT_MOUSE
		    setmouse();
#endif
		    if (vim_strchr(p_cpo, CPO_UNDO) != NULL)
			--no_u_sync;

		    if (typed == 'n')
		    {
			/* For a multi-line match, put matchcol at the NUL at
			 * the end of the line and set nmatch to one, so that
			 * we continue looking for a match on the next line.
			 * Avoids that ":%s/\nB\@=//gc" and ":%s/\n/,\r/gc"
			 * get stuck when pressing 'n'. */
			if (nmatch > 1)
			{
			    matchcol = (colnr_T)STRLEN(sub_firstline);
			    skip_match = TRUE;
			}
			goto skip;
		    }
		    if (got_quit)
			break;
		}

		/* Move the cursor to the start of the match, so that we can
		 * use "\=col("."). */
		curwin->w_cursor.col = regmatch.startpos[0].col;

		/*
		 * 3. substitute the string.
		 */
		/* get length of substitution part */
		sublen = vim_regsub_multi(&regmatch,
				    sub_firstlnum - regmatch.startpos[0].lnum,
				    sub, sub_firstline, FALSE, p_magic, TRUE);

		/* When the match included the "$" of the last line it may
		 * go beyond the last line of the buffer. */
		if (nmatch > curbuf->b_ml.ml_line_count - sub_firstlnum + 1)
		{
		    nmatch = curbuf->b_ml.ml_line_count - sub_firstlnum + 1;
		    skip_match = TRUE;
		}

		/* Need room for:
		 * - result so far in new_start (not for first sub in line)
		 * - original text up to match
		 * - length of substituted part
		 * - original text after match
		 */
		if (nmatch == 1)
		    p1 = sub_firstline;
		else
		{
		    p1 = ml_get(sub_firstlnum + nmatch - 1);
		    nmatch_tl += nmatch - 1;
		}
		copy_len = regmatch.startpos[0].col - copycol;
		needed_len = copy_len + ((unsigned)STRLEN(p1)
				       - regmatch.endpos[0].col) + sublen + 1;
		if (new_start == NULL)
		{
		    /*
		     * Get some space for a temporary buffer to do the
		     * substitution into (and some extra space to avoid
		     * too many calls to alloc()/free()).
		     */
		    new_start_len = needed_len + 50;
		    if ((new_start = alloc_check(new_start_len)) == NULL)
			goto outofmem;
		    *new_start = NUL;
		    new_end = new_start;
		}
		else
		{
		    /*
		     * Check if the temporary buffer is long enough to do the
		     * substitution into.  If not, make it larger (with a bit
		     * extra to avoid too many calls to alloc()/free()).
		     */
		    len = (unsigned)STRLEN(new_start);
		    needed_len += len;
		    if (needed_len > (int)new_start_len)
		    {
			new_start_len = needed_len + 50;
			if ((p1 = alloc_check(new_start_len)) == NULL)
			{
			    vim_free(new_start);
			    goto outofmem;
			}
			mch_memmove(p1, new_start, (size_t)(len + 1));
			vim_free(new_start);
			new_start = p1;
		    }
		    new_end = new_start + len;
		}

		/*
		 * copy the text up to the part that matched
		 */
		mch_memmove(new_end, sub_firstline + copycol, (size_t)copy_len);
		new_end += copy_len;

		(void)vim_regsub_multi(&regmatch,
				    sub_firstlnum - regmatch.startpos[0].lnum,
					   sub, new_end, TRUE, p_magic, TRUE);
		sub_nsubs++;
		did_sub = TRUE;

		/* Move the cursor to the start of the line, to avoid that it
		 * is beyond the end of the line after the substitution. */
		curwin->w_cursor.col = 0;

		/* For a multi-line match, make a copy of the last matched
		 * line and continue in that one. */
		if (nmatch > 1)
		{
		    sub_firstlnum += nmatch - 1;
		    vim_free(sub_firstline);
		    sub_firstline = vim_strsave(ml_get(sub_firstlnum));
		    /* When going beyond the last line, stop substituting. */
		    if (sub_firstlnum <= line2)
			do_again = TRUE;
		    else
			do_all = FALSE;
		}

		/* Remember next character to be copied. */
		copycol = regmatch.endpos[0].col;

		if (skip_match)
		{
		    /* Already hit end of the buffer, sub_firstlnum is one
		     * less than what it ought to be. */
		    vim_free(sub_firstline);
		    sub_firstline = vim_strsave((char_u *)"");
		    copycol = 0;
		}

		/*
		 * Now the trick is to replace CTRL-M chars with a real line
		 * break.  This would make it impossible to insert a CTRL-M in
		 * the text.  The line break can be avoided by preceding the
		 * CTRL-M with a backslash.  To be able to insert a backslash,
		 * they must be doubled in the string and are halved here.
		 * That is Vi compatible.
		 */
		for (p1 = new_end; *p1; ++p1)
		{
		    if (p1[0] == '\\' && p1[1] != NUL)  /* remove backslash */
			STRMOVE(p1, p1 + 1);
		    else if (*p1 == CAR)
		    {
			if (u_inssub(lnum) == OK)   /* prepare for undo */
			{
			    *p1 = NUL;		    /* truncate up to the CR */
			    ml_append(lnum - 1, new_start,
					(colnr_T)(p1 - new_start + 1), FALSE);
			    mark_adjust(lnum + 1, (linenr_T)MAXLNUM, 1L, 0L);
			    if (do_ask)
				appended_lines(lnum - 1, 1L);
			    else
			    {
				if (first_line == 0)
				    first_line = lnum;
				last_line = lnum + 1;
			    }
			    /* All line numbers increase. */
			    ++sub_firstlnum;
			    ++lnum;
			    ++line2;
			    /* move the cursor to the new line, like Vi */
			    ++curwin->w_cursor.lnum;
			    /* copy the rest */
			    STRMOVE(new_start, p1 + 1);
			    p1 = new_start - 1;
			}
		    }
#ifdef FEAT_MBYTE
		    else if (has_mbyte)
			p1 += (*mb_ptr2len)(p1) - 1;
#endif
		}

		/*
		 * 4. If do_all is set, find next match.
		 * Prevent endless loop with patterns that match empty
		 * strings, e.g. :s/$/pat/g or :s/[a-z]* /(&)/g.
		 * But ":s/\n/#/" is OK.
		 */
skip:
		/* We already know that we did the last subst when we are at
		 * the end of the line, except that a pattern like
		 * "bar\|\nfoo" may match at the NUL.  "lnum" can be below
		 * "line2" when there is a \zs in the pattern after a line
		 * break. */
		lastone = (skip_match
			|| got_int
			|| got_quit
			|| lnum > line2
			|| !(do_all || do_again)
			|| (sub_firstline[matchcol] == NUL && nmatch <= 1
					 && !re_multiline(regmatch.regprog)));
		nmatch = -1;

		/*
		 * Replace the line in the buffer when needed.  This is
		 * skipped when there are more matches.
		 * The check for nmatch_tl is needed for when multi-line
		 * matching must replace the lines before trying to do another
		 * match, otherwise "\@<=" won't work.
		 * When asking the user we like to show the already replaced
		 * text, but don't do it when "\<@=" or "\<@!" is used, it
		 * changes what matches.
		 * When the match starts below where we start searching also
		 * need to replace the line first (using \zs after \n).
		 */
		if (lastone
			|| (do_ask && !re_lookbehind(regmatch.regprog))
			|| nmatch_tl > 0
			|| (nmatch = vim_regexec_multi(&regmatch, curwin,
							curbuf, sub_firstlnum,
							 matchcol, NULL)) == 0
			|| regmatch.startpos[0].lnum > 0)
		{
		    if (new_start != NULL)
		    {
			/*
			 * Copy the rest of the line, that didn't match.
			 * "matchcol" has to be adjusted, we use the end of
			 * the line as reference, because the substitute may
			 * have changed the number of characters.  Same for
			 * "prev_matchcol".
			 */
			STRCAT(new_start, sub_firstline + copycol);
			matchcol = (colnr_T)STRLEN(sub_firstline) - matchcol;
			prev_matchcol = (colnr_T)STRLEN(sub_firstline)
							      - prev_matchcol;

			if (u_savesub(lnum) != OK)
			    break;
			ml_replace(lnum, new_start, TRUE);

			if (nmatch_tl > 0)
			{
			    /*
			     * Matched lines have now been substituted and are
			     * useless, delete them.  The part after the match
			     * has been appended to new_start, we don't need
			     * it in the buffer.
			     */
			    ++lnum;
			    if (u_savedel(lnum, nmatch_tl) != OK)
				break;
			    for (i = 0; i < nmatch_tl; ++i)
				ml_delete(lnum, (int)FALSE);
			    mark_adjust(lnum, lnum + nmatch_tl - 1,
						   (long)MAXLNUM, -nmatch_tl);
			    if (do_ask)
				deleted_lines(lnum, nmatch_tl);
			    --lnum;
			    line2 -= nmatch_tl; /* nr of lines decreases */
			    nmatch_tl = 0;
			}

			/* When asking, undo is saved each time, must also set
			 * changed flag each time. */
			if (do_ask)
			    changed_bytes(lnum, 0);
			else
			{
			    if (first_line == 0)
				first_line = lnum;
			    last_line = lnum + 1;
			}

			sub_firstlnum = lnum;
			vim_free(sub_firstline);    /* free the temp buffer */
			sub_firstline = new_start;
			new_start = NULL;
			matchcol = (colnr_T)STRLEN(sub_firstline) - matchcol;
			prev_matchcol = (colnr_T)STRLEN(sub_firstline)
							      - prev_matchcol;
			copycol = 0;
		    }
		    if (nmatch == -1 && !lastone)
			nmatch = vim_regexec_multi(&regmatch, curwin, curbuf,
					       sub_firstlnum, matchcol, NULL);

		    /*
		     * 5. break if there isn't another match in this line
		     */
		    if (nmatch <= 0)
		    {
			/* If the match found didn't start where we were
			 * searching, do the next search in the line where we
			 * found the match. */
			if (nmatch == -1)
			    lnum -= regmatch.startpos[0].lnum;
			break;
		    }
		}

		line_breakcheck();
	    }

	    if (did_sub)
		++sub_nlines;
	    vim_free(new_start);	/* for when substitute was cancelled */
	    vim_free(sub_firstline);	/* free the copy of the original line */
	    sub_firstline = NULL;
	}

	line_breakcheck();
    }

    if (first_line != 0)
    {
	/* Need to subtract the number of added lines from "last_line" to get
	 * the line number before the change (same as adding the number of
	 * deleted lines). */
	i = curbuf->b_ml.ml_line_count - old_line_count;
	changed_lines(first_line, 0, last_line - i, i);
    }

outofmem:
    vim_free(sub_firstline); /* may have to free allocated copy of the line */

    /* ":s/pat//n" doesn't move the cursor */
    if (do_count)
	curwin->w_cursor = old_cursor;

    if (sub_nsubs > start_nsubs)
    {
	/* Set the '[ and '] marks. */
	curbuf->b_op_start.lnum = eap->line1;
	curbuf->b_op_end.lnum = line2;
	curbuf->b_op_start.col = curbuf->b_op_end.col = 0;

	if (!global_busy)
	{
	    if (endcolumn)
		coladvance((colnr_T)MAXCOL);
	    else
		beginline(BL_WHITE | BL_FIX);
	    if (!do_sub_msg(do_count) && do_ask)
		MSG("");
	}
	else
	    global_need_beginline = TRUE;
	if (do_print)
	    print_line(curwin->w_cursor.lnum, do_number, do_list);
    }
    else if (!global_busy)
    {
	if (got_int)		/* interrupted */
	    EMSG(_(e_interr));
	else if (got_match)	/* did find something but nothing substituted */
	    MSG("");
	else if (do_error)	/* nothing found */
	    EMSG2(_(e_patnotf2), get_search_pat());
    }

    vim_free(regmatch.regprog);
}

/*
 * Give message for number of substitutions.
 * Can also be used after a ":global" command.
 * Return TRUE if a message was given.
 */
    int
do_sub_msg(count_only)
    int	    count_only;		/* used 'n' flag for ":s" */
{
    /*
     * Only report substitutions when:
     * - more than 'report' substitutions
     * - command was typed by user, or number of changed lines > 'report'
     * - giving messages is not disabled by 'lazyredraw'
     */
    if (((sub_nsubs > p_report && (KeyTyped || sub_nlines > 1 || p_report < 1))
		|| count_only)
	    && messaging())
    {
	if (got_int)
	    STRCPY(msg_buf, _("(Interrupted) "));
	else
	    *msg_buf = NUL;
	if (sub_nsubs == 1)
	    vim_snprintf_add((char *)msg_buf, sizeof(msg_buf),
		    "%s", count_only ? _("1 match") : _("1 substitution"));
	else
	    vim_snprintf_add((char *)msg_buf, sizeof(msg_buf),
		    count_only ? _("%ld matches") : _("%ld substitutions"),
								   sub_nsubs);
	if (sub_nlines == 1)
	    vim_snprintf_add((char *)msg_buf, sizeof(msg_buf),
		    "%s", _(" on 1 line"));
	else
	    vim_snprintf_add((char *)msg_buf, sizeof(msg_buf),
		    _(" on %ld lines"), (long)sub_nlines);
	if (msg(msg_buf))
	    /* save message to display it after redraw */
	    set_keep_msg(msg_buf, 0);
	return TRUE;
    }
    if (got_int)
    {
	EMSG(_(e_interr));
	return TRUE;
    }
    return FALSE;
}

/*
 * Execute a global command of the form:
 *
 * g/pattern/X : execute X on all lines where pattern matches
 * v/pattern/X : execute X on all lines where pattern does not match
 *
 * where 'X' is an EX command
 *
 * The command character (as well as the trailing slash) is optional, and
 * is assumed to be 'p' if missing.
 *
 * This is implemented in two passes: first we scan the file for the pattern and
 * set a mark for each line that (not) matches. secondly we execute the command
 * for each line that has a mark. This is required because after deleting
 * lines we do not know where to search for the next match.
 */
    void
ex_global(eap)
    exarg_T	*eap;
{
    linenr_T	lnum;		/* line number according to old situation */
    int		ndone = 0;
    int		type;		/* first char of cmd: 'v' or 'g' */
    char_u	*cmd;		/* command argument */

    char_u	delim;		/* delimiter, normally '/' */
    char_u	*pat;
    regmmatch_T	regmatch;
    int		match;
    int		which_pat;

    if (global_busy)
    {
	EMSG(_("E147: Cannot do :global recursive"));	/* will increment global_busy */
	return;
    }

    if (eap->forceit)		    /* ":global!" is like ":vglobal" */
	type = 'v';
    else
	type = *eap->cmd;
    cmd = eap->arg;
    which_pat = RE_LAST;	    /* default: use last used regexp */

    /*
     * undocumented vi feature:
     *	"\/" and "\?": use previous search pattern.
     *		 "\&": use previous substitute pattern.
     */
    if (*cmd == '\\')
    {
	++cmd;
	if (vim_strchr((char_u *)"/?&", *cmd) == NULL)
	{
	    EMSG(_(e_backslash));
	    return;
	}
	if (*cmd == '&')
	    which_pat = RE_SUBST;	/* use previous substitute pattern */
	else
	    which_pat = RE_SEARCH;	/* use previous search pattern */
	++cmd;
	pat = (char_u *)"";
    }
    else if (*cmd == NUL)
    {
	EMSG(_("E148: Regular expression missing from global"));
	return;
    }
    else
    {
	delim = *cmd;		/* get the delimiter */
	if (delim)
	    ++cmd;		/* skip delimiter if there is one */
	pat = cmd;		/* remember start of pattern */
	cmd = skip_regexp(cmd, delim, p_magic, &eap->arg);
	if (cmd[0] == delim)		    /* end delimiter found */
	    *cmd++ = NUL;		    /* replace it with a NUL */
    }

#ifdef FEAT_FKMAP	/* when in Farsi mode, reverse the character flow */
    if (p_altkeymap && curwin->w_p_rl)
	lrFswap(pat,0);
#endif

    if (search_regcomp(pat, RE_BOTH, which_pat, SEARCH_HIS, &regmatch) == FAIL)
    {
	EMSG(_(e_invcmd));
	return;
    }

    /*
     * pass 1: set marks for each (not) matching line
     */
    for (lnum = eap->line1; lnum <= eap->line2 && !got_int; ++lnum)
    {
	/* a match on this line? */
	match = vim_regexec_multi(&regmatch, curwin, curbuf, lnum,
							    (colnr_T)0, NULL);
	if ((type == 'g' && match) || (type == 'v' && !match))
	{
	    ml_setmarked(lnum);
	    ndone++;
	}
	line_breakcheck();
    }

    /*
     * pass 2: execute the command for each line that has been marked
     */
    if (got_int)
	MSG(_(e_interr));
    else if (ndone == 0)
    {
	if (type == 'v')
	    smsg((char_u *)_("Pattern found in every line: %s"), pat);
	else
	    smsg((char_u *)_(e_patnotf2), pat);
    }
    else
	global_exe(cmd);

    ml_clearmarked();	   /* clear rest of the marks */
    vim_free(regmatch.regprog);
}

/*
 * Execute "cmd" on lines marked with ml_setmarked().
 */
    void
global_exe(cmd)
    char_u	*cmd;
{
    linenr_T old_lcount;	/* b_ml.ml_line_count before the command */
    buf_T    *old_buf = curbuf;	/* remember what buffer we started in */
    linenr_T lnum;		/* line number according to old situation */

    /*
     * Set current position only once for a global command.
     * If global_busy is set, setpcmark() will not do anything.
     * If there is an error, global_busy will be incremented.
     */
    setpcmark();

    /* When the command writes a message, don't overwrite the command. */
    msg_didout = TRUE;

    sub_nsubs = 0;
    sub_nlines = 0;
    global_need_beginline = FALSE;
    global_busy = 1;
    old_lcount = curbuf->b_ml.ml_line_count;
    while (!got_int && (lnum = ml_firstmarked()) != 0 && global_busy == 1)
    {
	curwin->w_cursor.lnum = lnum;
	curwin->w_cursor.col = 0;
	if (*cmd == NUL || *cmd == '\n')
	    do_cmdline((char_u *)"p", NULL, NULL, DOCMD_NOWAIT);
	else
	    do_cmdline(cmd, NULL, NULL, DOCMD_NOWAIT);
	ui_breakcheck();
    }

    global_busy = 0;
    if (global_need_beginline)
	beginline(BL_WHITE | BL_FIX);
    else
	check_cursor();	/* cursor may be beyond the end of the line */

    /* the cursor may not have moved in the text but a change in a previous
     * line may move it on the screen */
    changed_line_abv_curs();

    /* If it looks like no message was written, allow overwriting the
     * command with the report for number of changes. */
    if (msg_col == 0 && msg_scrolled == 0)
	msg_didout = FALSE;

    /* If substitutes done, report number of substitutes, otherwise report
     * number of extra or deleted lines.
     * Don't report extra or deleted lines in the edge case where the buffer
     * we are in after execution is different from the buffer we started in. */
    if (!do_sub_msg(FALSE) && curbuf == old_buf)
	msgmore(curbuf->b_ml.ml_line_count - old_lcount);
}

#ifdef FEAT_VIMINFO
    int
read_viminfo_sub_string(virp, force)
    vir_T	*virp;
    int		force;
{
    if (force)
	vim_free(old_sub);
    if (force || old_sub == NULL)
	old_sub = viminfo_readstring(virp, 1, TRUE);
    return viminfo_readline(virp);
}

    void
write_viminfo_sub_string(fp)
    FILE    *fp;
{
    if (get_viminfo_parameter('/') != 0 && old_sub != NULL)
    {
	fputs(_("\n# Last Substitute String:\n$"), fp);
	viminfo_writestring(fp, old_sub);
    }
}
#endif /* FEAT_VIMINFO */

#if defined(EXITFREE) || defined(PROTO)
    void
free_old_sub()
{
    vim_free(old_sub);
}
#endif

#if (defined(FEAT_WINDOWS) && defined(FEAT_QUICKFIX)) || defined(PROTO)
/*
 * Set up for a tagpreview.
 * Return TRUE when it was created.
 */
    int
prepare_tagpreview(undo_sync)
    int		undo_sync;	/* sync undo when leaving the window */
{
    win_T	*wp;

# ifdef FEAT_GUI
    need_mouse_correct = TRUE;
# endif

    /*
     * If there is already a preview window open, use that one.
     */
    if (!curwin->w_p_pvw)
    {
	for (wp = firstwin; wp != NULL; wp = wp->w_next)
	    if (wp->w_p_pvw)
		break;
	if (wp != NULL)
	    win_enter(wp, undo_sync);
	else
	{
	    /*
	     * There is no preview window open yet.  Create one.
	     */
	    if (win_split(g_do_tagpreview > 0 ? g_do_tagpreview : 0, 0)
								      == FAIL)
		return FALSE;
	    curwin->w_p_pvw = TRUE;
	    curwin->w_p_wfh = TRUE;
	    RESET_BINDING(curwin);	    /* don't take over 'scrollbind'
					       and 'cursorbind' */
# ifdef FEAT_DIFF
	    curwin->w_p_diff = FALSE;	    /* no 'diff' */
# endif
# ifdef FEAT_FOLDING
	    curwin->w_p_fdc = 0;	    /* no 'foldcolumn' */
# endif
	    return TRUE;
	}
    }
    return FALSE;
}

#endif


/*
 * ":help": open a read-only window on a help file
 */
    void
ex_help(eap)
    exarg_T	*eap;
{
    char_u	*arg;
    char_u	*tag;
    FILE	*helpfd;	/* file descriptor of help file */
    int		n;
    int		i;
#ifdef FEAT_WINDOWS
    win_T	*wp;
#endif
    int		num_matches;
    char_u	**matches;
    char_u	*p;
    int		empty_fnum = 0;
    int		alt_fnum = 0;
    buf_T	*buf;
#ifdef FEAT_MULTI_LANG
    int		len;
    char_u	*lang;
#endif

    if (eap != NULL)
    {
	/*
	 * A ":help" command ends at the first LF, or at a '|' that is
	 * followed by some text.  Set nextcmd to the following command.
	 */
	for (arg = eap->arg; *arg; ++arg)
	{
	    if (*arg == '\n' || *arg == '\r'
		    || (*arg == '|' && arg[1] != NUL && arg[1] != '|'))
	    {
		*arg++ = NUL;
		eap->nextcmd = arg;
		break;
	    }
	}
	arg = eap->arg;

	if (eap->forceit && *arg == NUL)
	{
	    EMSG(_("E478: Don't panic!"));
	    return;
	}

	if (eap->skip)	    /* not executing commands */
	    return;
    }
    else
	arg = (char_u *)"";

    /* remove trailing blanks */
    p = arg + STRLEN(arg) - 1;
    while (p > arg && vim_iswhite(*p) && p[-1] != '\\')
	*p-- = NUL;

#ifdef FEAT_MULTI_LANG
    /* Check for a specified language */
    lang = check_help_lang(arg);
#endif

    /* When no argument given go to the index. */
    if (*arg == NUL)
	arg = (char_u *)"help.txt";

    /*
     * Check if there is a match for the argument.
     */
    n = find_help_tags(arg, &num_matches, &matches,
						 eap != NULL && eap->forceit);

    i = 0;
#ifdef FEAT_MULTI_LANG
    if (n != FAIL && lang != NULL)
	/* Find first item with the requested language. */
	for (i = 0; i < num_matches; ++i)
	{
	    len = (int)STRLEN(matches[i]);
	    if (len > 3 && matches[i][len - 3] == '@'
				  && STRICMP(matches[i] + len - 2, lang) == 0)
		break;
	}
#endif
    if (i >= num_matches || n == FAIL)
    {
#ifdef FEAT_MULTI_LANG
	if (lang != NULL)
	    EMSG3(_("E661: Sorry, no '%s' help for %s"), lang, arg);
	else
#endif
	    EMSG2(_("E149: Sorry, no help for %s"), arg);
	if (n != FAIL)
	    FreeWild(num_matches, matches);
	return;
    }

    /* The first match (in the requested language) is the best match. */
    tag = vim_strsave(matches[i]);
    FreeWild(num_matches, matches);

#ifdef FEAT_GUI
    need_mouse_correct = TRUE;
#endif

    /*
     * Re-use an existing help window or open a new one.
     * Always open a new one for ":tab help".
     */
    if (!curwin->w_buffer->b_help
#ifdef FEAT_WINDOWS
	    || cmdmod.tab != 0
#endif
	    )
    {
#ifdef FEAT_WINDOWS
	if (cmdmod.tab != 0)
	    wp = NULL;
	else
	    for (wp = firstwin; wp != NULL; wp = wp->w_next)
		if (wp->w_buffer != NULL && wp->w_buffer->b_help)
		    break;
	if (wp != NULL && wp->w_buffer->b_nwindows > 0)
	    win_enter(wp, TRUE);
	else
#endif
	{
	    /*
	     * There is no help window yet.
	     * Try to open the file specified by the "helpfile" option.
	     */
	    if ((helpfd = mch_fopen((char *)p_hf, READBIN)) == NULL)
	    {
		smsg((char_u *)_("Sorry, help file \"%s\" not found"), p_hf);
		goto erret;
	    }
	    fclose(helpfd);

#ifdef FEAT_WINDOWS
	    /* Split off help window; put it at far top if no position
	     * specified, the current window is vertically split and
	     * narrow. */
	    n = WSP_HELP;
# ifdef FEAT_VERTSPLIT
	    if (cmdmod.split == 0 && curwin->w_width != Columns
						  && curwin->w_width < 80)
		n |= WSP_TOP;
# endif
	    if (win_split(0, n) == FAIL)
		goto erret;
#else
	    /* use current window */
	    if (!can_abandon(curbuf, FALSE))
		goto erret;
#endif

#ifdef FEAT_WINDOWS
	    if (curwin->w_height < p_hh)
		win_setheight((int)p_hh);
#endif

	    /*
	     * Open help file (do_ecmd() will set b_help flag, readfile() will
	     * set b_p_ro flag).
	     * Set the alternate file to the previously edited file.
	     */
	    alt_fnum = curbuf->b_fnum;
	    (void)do_ecmd(0, NULL, NULL, NULL, ECMD_LASTL,
			  ECMD_HIDE + ECMD_SET_HELP,
#ifdef FEAT_WINDOWS
			  NULL  /* buffer is still open, don't store info */
#else
			  curwin
#endif
		    );
	    if (!cmdmod.keepalt)
		curwin->w_alt_fnum = alt_fnum;
	    empty_fnum = curbuf->b_fnum;
	}
    }

    if (!p_im)
	restart_edit = 0;	    /* don't want insert mode in help file */

    if (tag != NULL)
	do_tag(tag, DT_HELP, 1, FALSE, TRUE);

    /* Delete the empty buffer if we're not using it.  Careful: autocommands
     * may have jumped to another window, check that the buffer is not in a
     * window. */
    if (empty_fnum != 0 && curbuf->b_fnum != empty_fnum)
    {
	buf = buflist_findnr(empty_fnum);
	if (buf != NULL && buf->b_nwindows == 0)
	    wipe_buffer(buf, TRUE);
    }

    /* keep the previous alternate file */
    if (alt_fnum != 0 && curwin->w_alt_fnum == empty_fnum && !cmdmod.keepalt)
	curwin->w_alt_fnum = alt_fnum;

erret:
    vim_free(tag);
}


#if defined(FEAT_MULTI_LANG) || defined(PROTO)
/*
 * In an argument search for a language specifiers in the form "@xx".
 * Changes the "@" to NUL if found, and returns a pointer to "xx".
 * Returns NULL if not found.
 */
    char_u *
check_help_lang(arg)
    char_u *arg;
{
    int len = (int)STRLEN(arg);

    if (len >= 3 && arg[len - 3] == '@' && ASCII_ISALPHA(arg[len - 2])
					       && ASCII_ISALPHA(arg[len - 1]))
    {
	arg[len - 3] = NUL;		/* remove the '@' */
	return arg + len - 2;
    }
    return NULL;
}
#endif

/*
 * Return a heuristic indicating how well the given string matches.  The
 * smaller the number, the better the match.  This is the order of priorities,
 * from best match to worst match:
 *	- Match with least alpha-numeric characters is better.
 *	- Match with least total characters is better.
 *	- Match towards the start is better.
 *	- Match starting with "+" is worse (feature instead of command)
 * Assumption is made that the matched_string passed has already been found to
 * match some string for which help is requested.  webb.
 */
    int
help_heuristic(matched_string, offset, wrong_case)
    char_u	*matched_string;
    int		offset;			/* offset for match */
    int		wrong_case;		/* no matching case */
{
    int		num_letters;
    char_u	*p;

    num_letters = 0;
    for (p = matched_string; *p; p++)
	if (ASCII_ISALNUM(*p))
	    num_letters++;

    /*
     * Multiply the number of letters by 100 to give it a much bigger
     * weighting than the number of characters.
     * If there only is a match while ignoring case, add 5000.
     * If the match starts in the middle of a word, add 10000 to put it
     * somewhere in the last half.
     * If the match is more than 2 chars from the start, multiply by 200 to
     * put it after matches at the start.
     */
    if (ASCII_ISALNUM(matched_string[offset]) && offset > 0
				 && ASCII_ISALNUM(matched_string[offset - 1]))
	offset += 10000;
    else if (offset > 2)
	offset *= 200;
    if (wrong_case)
	offset += 5000;
    /* Features are less interesting than the subjects themselves, but "+"
     * alone is not a feature. */
    if (matched_string[0] == '+' && matched_string[1] != NUL)
	offset += 100;
    return (int)(100 * num_letters + STRLEN(matched_string) + offset);
}

/*
 * Compare functions for qsort() below, that checks the help heuristics number
 * that has been put after the tagname by find_tags().
 */
    static int
#ifdef __BORLANDC__
_RTLENTRYF
#endif
help_compare(s1, s2)
    const void	*s1;
    const void	*s2;
{
    char    *p1;
    char    *p2;

    p1 = *(char **)s1 + strlen(*(char **)s1) + 1;
    p2 = *(char **)s2 + strlen(*(char **)s2) + 1;
    return strcmp(p1, p2);
}

/*
 * Find all help tags matching "arg", sort them and return in matches[], with
 * the number of matches in num_matches.
 * The matches will be sorted with a "best" match algorithm.
 * When "keep_lang" is TRUE try keeping the language of the current buffer.
 */
    int
find_help_tags(arg, num_matches, matches, keep_lang)
    char_u	*arg;
    int		*num_matches;
    char_u	***matches;
    int		keep_lang;
{
    char_u	*s, *d;
    int		i;
    static char *(mtable[]) = {"*", "g*", "[*", "]*", ":*",
			       "/*", "/\\*", "\"*", "**",
			       "/\\(\\)",
			       "?", ":?", "?<CR>", "g?", "g?g?", "g??", "z?",
			       "/\\?", "/\\z(\\)", "\\=", ":s\\=",
			       "[count]", "[quotex]", "[range]",
			       "[pattern]", "\\|", "\\%$"};
    static char *(rtable[]) = {"star", "gstar", "[star", "]star", ":star",
			       "/star", "/\\\\star", "quotestar", "starstar",
			       "/\\\\(\\\\)",
			       "?", ":?", "?<CR>", "g?", "g?g?", "g??", "z?",
			       "/\\\\?", "/\\\\z(\\\\)", "\\\\=", ":s\\\\=",
			       "\\[count]", "\\[quotex]", "\\[range]",
			       "\\[pattern]", "\\\\bar", "/\\\\%\\$"};
    int flags;

    d = IObuff;		    /* assume IObuff is long enough! */

    /*
     * Recognize a few exceptions to the rule.	Some strings that contain '*'
     * with "star".  Otherwise '*' is recognized as a wildcard.
     */
    for (i = (int)(sizeof(mtable) / sizeof(char *)); --i >= 0; )
	if (STRCMP(arg, mtable[i]) == 0)
	{
	    STRCPY(d, rtable[i]);
	    break;
	}

    if (i < 0)	/* no match in table */
    {
	/* Replace "\S" with "/\\S", etc.  Otherwise every tag is matched.
	 * Also replace "\%^" and "\%(", they match every tag too.
	 * Also "\zs", "\z1", etc.
	 * Also "\@<", "\@=", "\@<=", etc.
	 * And also "\_$" and "\_^". */
	if (arg[0] == '\\'
		&& ((arg[1] != NUL && arg[2] == NUL)
		    || (vim_strchr((char_u *)"%_z@", arg[1]) != NULL
							   && arg[2] != NUL)))
	{
	    STRCPY(d, "/\\\\");
	    STRCPY(d + 3, arg + 1);
	    /* Check for "/\\_$", should be "/\\_\$" */
	    if (d[3] == '_' && d[4] == '$')
		STRCPY(d + 4, "\\$");
	}
	else
	{
	  /* replace "[:...:]" with "\[:...:]"; "[+...]" with "\[++...]" */
	    if (arg[0] == '[' && (arg[1] == ':'
					 || (arg[1] == '+' && arg[2] == '+')))
	      *d++ = '\\';

	  for (s = arg; *s; ++s)
	  {
	    /*
	     * Replace "|" with "bar" and '"' with "quote" to match the name of
	     * the tags for these commands.
	     * Replace "*" with ".*" and "?" with "." to match command line
	     * completion.
	     * Insert a backslash before '~', '$' and '.' to avoid their
	     * special meaning.
	     */
	    if (d - IObuff > IOSIZE - 10)	/* getting too long!? */
		break;
	    switch (*s)
	    {
		case '|':   STRCPY(d, "bar");
			    d += 3;
			    continue;
		case '"':   STRCPY(d, "quote");
			    d += 5;
			    continue;
		case '*':   *d++ = '.';
			    break;
		case '?':   *d++ = '.';
			    continue;
		case '$':
		case '.':
		case '~':   *d++ = '\\';
			    break;
	    }

	    /*
	     * Replace "^x" by "CTRL-X". Don't do this for "^_" to make
	     * ":help i_^_CTRL-D" work.
	     * Insert '-' before and after "CTRL-X" when applicable.
	     */
	    if (*s < ' ' || (*s == '^' && s[1] && (ASCII_ISALPHA(s[1])
			   || vim_strchr((char_u *)"?@[\\]^", s[1]) != NULL)))
	    {
		if (d > IObuff && d[-1] != '_')
		    *d++ = '_';		/* prepend a '_' */
		STRCPY(d, "CTRL-");
		d += 5;
		if (*s < ' ')
		{
#ifdef EBCDIC
		    *d++ = CtrlChar(*s);
#else
		    *d++ = *s + '@';
#endif
		    if (d[-1] == '\\')
			*d++ = '\\';	/* double a backslash */
		}
		else
		    *d++ = *++s;
		if (s[1] != NUL && s[1] != '_')
		    *d++ = '_';		/* append a '_' */
		continue;
	    }
	    else if (*s == '^')		/* "^" or "CTRL-^" or "^_" */
		*d++ = '\\';

	    /*
	     * Insert a backslash before a backslash after a slash, for search
	     * pattern tags: "/\|" --> "/\\|".
	     */
	    else if (s[0] == '\\' && s[1] != '\\'
					       && *arg == '/' && s == arg + 1)
		*d++ = '\\';

	    /* "CTRL-\_" -> "CTRL-\\_" to avoid the special meaning of "\_" in
	     * "CTRL-\_CTRL-N" */
	    if (STRNICMP(s, "CTRL-\\_", 7) == 0)
	    {
		STRCPY(d, "CTRL-\\\\");
		d += 7;
		s += 6;
	    }

	    *d++ = *s;

	    /*
	     * If tag starts with ', toss everything after a second '. Fixes
	     * CTRL-] on 'option'. (would include the trailing '.').
	     */
	    if (*s == '\'' && s > arg && *arg == '\'')
		break;
	  }
	  *d = NUL;
	}
    }

    *matches = (char_u **)"";
    *num_matches = 0;
    flags = TAG_HELP | TAG_REGEXP | TAG_NAMES | TAG_VERBOSE;
    if (keep_lang)
	flags |= TAG_KEEP_LANG;
    if (find_tags(IObuff, num_matches, matches, flags, (int)MAXCOL, NULL) == OK
	    && *num_matches > 0)
    {
	/* Sort the matches found on the heuristic number that is after the
	 * tag name. */
	qsort((void *)*matches, (size_t)*num_matches,
					      sizeof(char_u *), help_compare);
	/* Delete more than TAG_MANY to reduce the size of the listing. */
	while (*num_matches > TAG_MANY)
	    vim_free((*matches)[--*num_matches]);
    }
    return OK;
}

/*
 * After reading a help file: May cleanup a help buffer when syntax
 * highlighting is not used.
 */
    void
fix_help_buffer()
{
    linenr_T	lnum;
    char_u	*line;
    int		in_example = FALSE;
    int		len;
    char_u	*p;
    char_u	*rt;
    int		mustfree;

    /* set filetype to "help". */
    set_option_value((char_u *)"ft", 0L, (char_u *)"help", OPT_LOCAL);

#ifdef FEAT_SYN_HL
    if (!syntax_present(curwin))
#endif
    {
	for (lnum = 1; lnum <= curbuf->b_ml.ml_line_count; ++lnum)
	{
	    line = ml_get_buf(curbuf, lnum, FALSE);
	    len = (int)STRLEN(line);
	    if (in_example && len > 0 && !vim_iswhite(line[0]))
	    {
		/* End of example: non-white or '<' in first column. */
		if (line[0] == '<')
		{
		    /* blank-out a '<' in the first column */
		    line = ml_get_buf(curbuf, lnum, TRUE);
		    line[0] = ' ';
		}
		in_example = FALSE;
	    }
	    if (!in_example && len > 0)
	    {
		if (line[len - 1] == '>' && (len == 1 || line[len - 2] == ' '))
		{
		    /* blank-out a '>' in the last column (start of example) */
		    line = ml_get_buf(curbuf, lnum, TRUE);
		    line[len - 1] = ' ';
		    in_example = TRUE;
		}
		else if (line[len - 1] == '~')
		{
		    /* blank-out a '~' at the end of line (header marker) */
		    line = ml_get_buf(curbuf, lnum, TRUE);
		    line[len - 1] = ' ';
		}
	    }
	}
    }

    /*
     * In the "help.txt" file, add the locally added help files.
     * This uses the very first line in the help file.
     */
    if (fnamecmp(gettail(curbuf->b_fname), "help.txt") == 0)
    {
	for (lnum = 1; lnum < curbuf->b_ml.ml_line_count; ++lnum)
	{
	    line = ml_get_buf(curbuf, lnum, FALSE);
	    if (strstr((char *)line, "*local-additions*") != NULL)
	    {
		/* Go through all directories in 'runtimepath', skipping
		 * $VIMRUNTIME. */
		p = p_rtp;
		while (*p != NUL)
		{
		    copy_option_part(&p, NameBuff, MAXPATHL, ",");
		    mustfree = FALSE;
		    rt = vim_getenv((char_u *)"VIMRUNTIME", &mustfree);
		    if (fullpathcmp(rt, NameBuff, FALSE) != FPC_SAME)
		    {
			int	fcount;
			char_u	**fnames;
			FILE	*fd;
			char_u	*s;
			int	fi;
#ifdef FEAT_MBYTE
			vimconv_T	vc;
			char_u		*cp;
#endif

			/* Find all "doc/ *.txt" files in this directory. */
			add_pathsep(NameBuff);
			STRCAT(NameBuff, "doc/*.txt");
			if (gen_expand_wildcards(1, &NameBuff, &fcount,
					     &fnames, EW_FILE|EW_SILENT) == OK
				&& fcount > 0)
			{
			    for (fi = 0; fi < fcount; ++fi)
			    {
				fd = mch_fopen((char *)fnames[fi], "r");
				if (fd != NULL)
				{
				    vim_fgets(IObuff, IOSIZE, fd);
				    if (IObuff[0] == '*'
					    && (s = vim_strchr(IObuff + 1, '*'))
								      != NULL)
				    {
#ifdef FEAT_MBYTE
					int	this_utf = MAYBE;
#endif
					/* Change tag definition to a
					 * reference and remove <CR>/<NL>. */
					IObuff[0] = '|';
					*s = '|';
					while (*s != NUL)
					{
					    if (*s == '\r' || *s == '\n')
						*s = NUL;
#ifdef FEAT_MBYTE
					    /* The text is utf-8 when a byte
					     * above 127 is found and no
					     * illegal byte sequence is found.
					     */
					    if (*s >= 0x80 && this_utf != FALSE)
					    {
						int	l;

						this_utf = TRUE;
						l = utf_ptr2len(s);
						if (l == 1)
						    this_utf = FALSE;
						s += l - 1;
					    }
#endif
					    ++s;
					}
#ifdef FEAT_MBYTE
					/* The help file is latin1 or utf-8;
					 * conversion to the current
					 * 'encoding' may be required. */
					vc.vc_type = CONV_NONE;
					convert_setup(&vc, (char_u *)(
						    this_utf == TRUE ? "utf-8"
							  : "latin1"), p_enc);
					if (vc.vc_type == CONV_NONE)
					    /* No conversion needed. */
					    cp = IObuff;
					else
					{
					    /* Do the conversion.  If it fails
					     * use the unconverted text. */
					    cp = string_convert(&vc, IObuff,
									NULL);
					    if (cp == NULL)
						cp = IObuff;
					}
					convert_setup(&vc, NULL, NULL);

					ml_append(lnum, cp, (colnr_T)0, FALSE);
					if (cp != IObuff)
					    vim_free(cp);
#else
					ml_append(lnum, IObuff, (colnr_T)0,
								       FALSE);
#endif
					++lnum;
				    }
				    fclose(fd);
				}
			    }
			    FreeWild(fcount, fnames);
			}
		    }
		    if (mustfree)
			vim_free(rt);
		}
		break;
	    }
	}
    }
}

/*
 * ":exusage"
 */
    void
ex_exusage(eap)
    exarg_T	*eap UNUSED;
{
    do_cmdline_cmd((char_u *)"help ex-cmd-index");
}

/*
 * ":viusage"
 */
    void
ex_viusage(eap)
    exarg_T	*eap UNUSED;
{
    do_cmdline_cmd((char_u *)"help normal-index");
}

#if defined(FEAT_EX_EXTRA) || defined(PROTO)
static void helptags_one __ARGS((char_u *dir, char_u *ext, char_u *lang, int add_help_tags));

/*
 * ":helptags"
 */
    void
ex_helptags(eap)
    exarg_T	*eap;
{
    garray_T	ga;
    int		i, j;
    int		len;
#ifdef FEAT_MULTI_LANG
    char_u	lang[2];
#endif
    expand_T	xpc;
    char_u	*dirname;
    char_u	ext[5];
    char_u	fname[8];
    int		filecount;
    char_u	**files;
    int		add_help_tags = FALSE;

    /* Check for ":helptags ++t {dir}". */
    if (STRNCMP(eap->arg, "++t", 3) == 0 && vim_iswhite(eap->arg[3]))
    {
	add_help_tags = TRUE;
	eap->arg = skipwhite(eap->arg + 3);
    }

    ExpandInit(&xpc);
    xpc.xp_context = EXPAND_DIRECTORIES;
    dirname = ExpandOne(&xpc, eap->arg, NULL,
			    WILD_LIST_NOTFOUND|WILD_SILENT, WILD_EXPAND_FREE);
    if (dirname == NULL || !mch_isdir(dirname))
    {
	EMSG2(_("E150: Not a directory: %s"), eap->arg);
	return;
    }

#ifdef FEAT_MULTI_LANG
    /* Get a list of all files in the directory. */
    STRCPY(NameBuff, dirname);
    add_pathsep(NameBuff);
    STRCAT(NameBuff, "*");
    if (gen_expand_wildcards(1, &NameBuff, &filecount, &files,
						    EW_FILE|EW_SILENT) == FAIL
	    || filecount == 0)
    {
	EMSG2("E151: No match: %s", NameBuff);
	vim_free(dirname);
	return;
    }

    /* Go over all files in the directory to find out what languages are
     * present. */
    ga_init2(&ga, 1, 10);
    for (i = 0; i < filecount; ++i)
    {
	len = (int)STRLEN(files[i]);
	if (len > 4)
	{
	    if (STRICMP(files[i] + len - 4, ".txt") == 0)
	    {
		/* ".txt" -> language "en" */
		lang[0] = 'e';
		lang[1] = 'n';
	    }
	    else if (files[i][len - 4] == '.'
		    && ASCII_ISALPHA(files[i][len - 3])
		    && ASCII_ISALPHA(files[i][len - 2])
		    && TOLOWER_ASC(files[i][len - 1]) == 'x')
	    {
		/* ".abx" -> language "ab" */
		lang[0] = TOLOWER_ASC(files[i][len - 3]);
		lang[1] = TOLOWER_ASC(files[i][len - 2]);
	    }
	    else
		continue;

	    /* Did we find this language already? */
	    for (j = 0; j < ga.ga_len; j += 2)
		if (STRNCMP(lang, ((char_u *)ga.ga_data) + j, 2) == 0)
		    break;
	    if (j == ga.ga_len)
	    {
		/* New language, add it. */
		if (ga_grow(&ga, 2) == FAIL)
		    break;
		((char_u *)ga.ga_data)[ga.ga_len++] = lang[0];
		((char_u *)ga.ga_data)[ga.ga_len++] = lang[1];
	    }
	}
    }

    /*
     * Loop over the found languages to generate a tags file for each one.
     */
    for (j = 0; j < ga.ga_len; j += 2)
    {
	STRCPY(fname, "tags-xx");
	fname[5] = ((char_u *)ga.ga_data)[j];
	fname[6] = ((char_u *)ga.ga_data)[j + 1];
	if (fname[5] == 'e' && fname[6] == 'n')
	{
	    /* English is an exception: use ".txt" and "tags". */
	    fname[4] = NUL;
	    STRCPY(ext, ".txt");
	}
	else
	{
	    /* Language "ab" uses ".abx" and "tags-ab". */
	    STRCPY(ext, ".xxx");
	    ext[1] = fname[5];
	    ext[2] = fname[6];
	}
	helptags_one(dirname, ext, fname, add_help_tags);
    }

    ga_clear(&ga);
    FreeWild(filecount, files);

#else
    /* No language support, just use "*.txt" and "tags". */
    helptags_one(dirname, (char_u *)".txt", (char_u *)"tags", add_help_tags);
#endif
    vim_free(dirname);
}

    static void
helptags_one(dir, ext, tagfname, add_help_tags)
    char_u	*dir;		/* doc directory */
    char_u	*ext;		/* suffix, ".txt", ".itx", ".frx", etc. */
    char_u	*tagfname;      /* "tags" for English, "tags-fr" for French. */
    int		add_help_tags;  /* add "help-tags" tag */
{
    FILE	*fd_tags;
    FILE	*fd;
    garray_T	ga;
    int		filecount;
    char_u	**files;
    char_u	*p1, *p2;
    int		fi;
    char_u	*s;
    int		i;
    char_u	*fname;
# ifdef FEAT_MBYTE
    int		utf8 = MAYBE;
    int		this_utf8;
    int		firstline;
    int		mix = FALSE;	/* detected mixed encodings */
# endif

    /*
     * Find all *.txt files.
     */
    STRCPY(NameBuff, dir);
    add_pathsep(NameBuff);
    STRCAT(NameBuff, "*");
    STRCAT(NameBuff, ext);
    if (gen_expand_wildcards(1, &NameBuff, &filecount, &files,
						    EW_FILE|EW_SILENT) == FAIL
	    || filecount == 0)
    {
	if (!got_int)
	    EMSG2("E151: No match: %s", NameBuff);
	return;
    }

    /*
     * Open the tags file for writing.
     * Do this before scanning through all the files.
     */
    STRCPY(NameBuff, dir);
    add_pathsep(NameBuff);
    STRCAT(NameBuff, tagfname);
    fd_tags = mch_fopen((char *)NameBuff, "w");
    if (fd_tags == NULL)
    {
	EMSG2(_("E152: Cannot open %s for writing"), NameBuff);
	FreeWild(filecount, files);
	return;
    }

    /*
     * If using the "++t" argument or generating tags for "$VIMRUNTIME/doc"
     * add the "help-tags" tag.
     */
    ga_init2(&ga, (int)sizeof(char_u *), 100);
    if (add_help_tags || fullpathcmp((char_u *)"$VIMRUNTIME/doc",
						      dir, FALSE) == FPC_SAME)
    {
	if (ga_grow(&ga, 1) == FAIL)
	    got_int = TRUE;
	else
	{
	    s = alloc(18 + (unsigned)STRLEN(tagfname));
	    if (s == NULL)
		got_int = TRUE;
	    else
	    {
		sprintf((char *)s, "help-tags\t%s\t1\n", tagfname);
		((char_u **)ga.ga_data)[ga.ga_len] = s;
		++ga.ga_len;
	    }
	}
    }

    /*
     * Go over all the files and extract the tags.
     */
    for (fi = 0; fi < filecount && !got_int; ++fi)
    {
	fd = mch_fopen((char *)files[fi], "r");
	if (fd == NULL)
	{
	    EMSG2(_("E153: Unable to open %s for reading"), files[fi]);
	    continue;
	}
	fname = gettail(files[fi]);

# ifdef FEAT_MBYTE
	firstline = TRUE;
# endif
	while (!vim_fgets(IObuff, IOSIZE, fd) && !got_int)
	{
# ifdef FEAT_MBYTE
	    if (firstline)
	    {
		/* Detect utf-8 file by a non-ASCII char in the first line. */
		this_utf8 = MAYBE;
		for (s = IObuff; *s != NUL; ++s)
		    if (*s >= 0x80)
		    {
			int l;

			this_utf8 = TRUE;
			l = utf_ptr2len(s);
			if (l == 1)
			{
			    /* Illegal UTF-8 byte sequence. */
			    this_utf8 = FALSE;
			    break;
			}
			s += l - 1;
		    }
		if (this_utf8 == MAYBE)	    /* only ASCII characters found */
		    this_utf8 = FALSE;
		if (utf8 == MAYBE)	    /* first file */
		    utf8 = this_utf8;
		else if (utf8 != this_utf8)
		{
		    EMSG2(_("E670: Mix of help file encodings within a language: %s"), files[fi]);
		    mix = !got_int;
		    got_int = TRUE;
		}
		firstline = FALSE;
	    }
# endif
	    p1 = vim_strchr(IObuff, '*');	/* find first '*' */
	    while (p1 != NULL)
	    {
		p2 = vim_strchr(p1 + 1, '*');	/* find second '*' */
		if (p2 != NULL && p2 > p1 + 1)	/* skip "*" and "**" */
		{
		    for (s = p1 + 1; s < p2; ++s)
			if (*s == ' ' || *s == '\t' || *s == '|')
			    break;

		    /*
		     * Only accept a *tag* when it consists of valid
		     * characters, there is white space before it and is
		     * followed by a white character or end-of-line.
		     */
		    if (s == p2
			    && (p1 == IObuff || p1[-1] == ' ' || p1[-1] == '\t')
			    && (vim_strchr((char_u *)" \t\n\r", s[1]) != NULL
				|| s[1] == '\0'))
		    {
			*p2 = '\0';
			++p1;
			if (ga_grow(&ga, 1) == FAIL)
			{
			    got_int = TRUE;
			    break;
			}
			s = alloc((unsigned)(p2 - p1 + STRLEN(fname) + 2));
			if (s == NULL)
			{
			    got_int = TRUE;
			    break;
			}
			((char_u **)ga.ga_data)[ga.ga_len] = s;
			++ga.ga_len;
			sprintf((char *)s, "%s\t%s", p1, fname);

			/* find next '*' */
			p2 = vim_strchr(p2 + 1, '*');
		    }
		}
		p1 = p2;
	    }
	    line_breakcheck();
	}

	fclose(fd);
    }

    FreeWild(filecount, files);

    if (!got_int)
    {
	/*
	 * Sort the tags.
	 */
	sort_strings((char_u **)ga.ga_data, ga.ga_len);

	/*
	 * Check for duplicates.
	 */
	for (i = 1; i < ga.ga_len; ++i)
	{
	    p1 = ((char_u **)ga.ga_data)[i - 1];
	    p2 = ((char_u **)ga.ga_data)[i];
	    while (*p1 == *p2)
	    {
		if (*p2 == '\t')
		{
		    *p2 = NUL;
		    vim_snprintf((char *)NameBuff, MAXPATHL,
			    _("E154: Duplicate tag \"%s\" in file %s/%s"),
				     ((char_u **)ga.ga_data)[i], dir, p2 + 1);
		    EMSG(NameBuff);
		    *p2 = '\t';
		    break;
		}
		++p1;
		++p2;
	    }
	}

# ifdef FEAT_MBYTE
	if (utf8 == TRUE)
	    fprintf(fd_tags, "!_TAG_FILE_ENCODING\tutf-8\t//\n");
# endif

	/*
	 * Write the tags into the file.
	 */
	for (i = 0; i < ga.ga_len; ++i)
	{
	    s = ((char_u **)ga.ga_data)[i];
	    if (STRNCMP(s, "help-tags\t", 10) == 0)
		/* help-tags entry was added in formatted form */
		fputs((char *)s, fd_tags);
	    else
	    {
		fprintf(fd_tags, "%s\t/*", s);
		for (p1 = s; *p1 != '\t'; ++p1)
		{
		    /* insert backslash before '\\' and '/' */
		    if (*p1 == '\\' || *p1 == '/')
			putc('\\', fd_tags);
		    putc(*p1, fd_tags);
		}
		fprintf(fd_tags, "*\n");
	    }
	}
    }
#ifdef FEAT_MBYTE
    if (mix)
	got_int = FALSE;    /* continue with other languages */
#endif

    for (i = 0; i < ga.ga_len; ++i)
	vim_free(((char_u **)ga.ga_data)[i]);
    ga_clear(&ga);
    fclose(fd_tags);	    /* there is no check for an error... */
}
#endif

#if defined(FEAT_SIGNS) || defined(PROTO)

/*
 * Struct to hold the sign properties.
 */
typedef struct sign sign_T;

struct sign
{
    sign_T	*sn_next;	/* next sign in list */
    int		sn_typenr;	/* type number of sign */
    char_u	*sn_name;	/* name of sign */
    char_u	*sn_icon;	/* name of pixmap */
#ifdef FEAT_SIGN_ICONS
    void	*sn_image;	/* icon image */
#endif
    char_u	*sn_text;	/* text used instead of pixmap */
    int		sn_line_hl;	/* highlight ID for line */
    int		sn_text_hl;	/* highlight ID for text */
};

static sign_T	*first_sign = NULL;
static int	next_sign_typenr = 1;

static int sign_cmd_idx __ARGS((char_u *begin_cmd, char_u *end_cmd));
static void sign_list_defined __ARGS((sign_T *sp));
static void sign_undefine __ARGS((sign_T *sp, sign_T *sp_prev));

static char *cmds[] = {
			"define",
#define SIGNCMD_DEFINE	0
			"undefine",
#define SIGNCMD_UNDEFINE 1
			"list",
#define SIGNCMD_LIST	2
			"place",
#define SIGNCMD_PLACE	3
			"unplace",
#define SIGNCMD_UNPLACE	4
			"jump",
#define SIGNCMD_JUMP	5
			NULL
#define SIGNCMD_LAST	6
};

/*
 * Find index of a ":sign" subcmd from its name.
 * "*end_cmd" must be writable.
 */
    static int
sign_cmd_idx(begin_cmd, end_cmd)
    char_u	*begin_cmd;	/* begin of sign subcmd */
    char_u	*end_cmd;	/* just after sign subcmd */
{
    int		idx;
    char	save = *end_cmd;

    *end_cmd = NUL;
    for (idx = 0; ; ++idx)
	if (cmds[idx] == NULL || STRCMP(begin_cmd, cmds[idx]) == 0)
	    break;
    *end_cmd = save;
    return idx;
}

/*
 * ":sign" command
 */
    void
ex_sign(eap)
    exarg_T	*eap;
{
    char_u	*arg = eap->arg;
    char_u	*p;
    int		idx;
    sign_T	*sp;
    sign_T	*sp_prev;
    buf_T	*buf;

    /* Parse the subcommand. */
    p = skiptowhite(arg);
    idx = sign_cmd_idx(arg, p);
    if (idx == SIGNCMD_LAST)
    {
	EMSG2(_("E160: Unknown sign command: %s"), arg);
	return;
    }
    arg = skipwhite(p);

    if (idx <= SIGNCMD_LIST)
    {
	/*
	 * Define, undefine or list signs.
	 */
	if (idx == SIGNCMD_LIST && *arg == NUL)
	{
	    /* ":sign list": list all defined signs */
	    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
		sign_list_defined(sp);
	}
	else if (*arg == NUL)
	    EMSG(_("E156: Missing sign name"));
	else
	{
	    /* Isolate the sign name.  If it's a number skip leading zeroes,
	     * so that "099" and "99" are the same sign.  But keep "0". */
	    p = skiptowhite(arg);
	    if (*p != NUL)
		*p++ = NUL;
	    while (arg[0] == '0' && arg[1] != NUL)
		++arg;

	    sp_prev = NULL;
	    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	    {
		if (STRCMP(sp->sn_name, arg) == 0)
		    break;
		sp_prev = sp;
	    }
	    if (idx == SIGNCMD_DEFINE)
	    {
		/* ":sign define {name} ...": define a sign */
		if (sp == NULL)
		{
		    sign_T	*lp;
		    int		start = next_sign_typenr;

		    /* Allocate a new sign. */
		    sp = (sign_T *)alloc_clear((unsigned)sizeof(sign_T));
		    if (sp == NULL)
			return;

		    /* Check that next_sign_typenr is not already being used.
		     * This only happens after wrapping around.  Hopefully
		     * another one got deleted and we can use its number. */
		    for (lp = first_sign; lp != NULL; )
		    {
			if (lp->sn_typenr == next_sign_typenr)
			{
			    ++next_sign_typenr;
			    if (next_sign_typenr == MAX_TYPENR)
				next_sign_typenr = 1;
			    if (next_sign_typenr == start)
			    {
				vim_free(sp);
				EMSG(_("E612: Too many signs defined"));
				return;
			    }
			    lp = first_sign;  /* start all over */
			    continue;
			}
			lp = lp->sn_next;
		    }

		    sp->sn_typenr = next_sign_typenr;
		    if (++next_sign_typenr == MAX_TYPENR)
			next_sign_typenr = 1; /* wrap around */

		    sp->sn_name = vim_strsave(arg);
		    if (sp->sn_name == NULL)  /* out of memory */
		    {
			vim_free(sp);
			return;
		    }

		    /* add the new sign to the list of signs */
		    if (sp_prev == NULL)
			first_sign = sp;
		    else
			sp_prev->sn_next = sp;
		}

		/* set values for a defined sign. */
		for (;;)
		{
		    arg = skipwhite(p);
		    if (*arg == NUL)
			break;
		    p = skiptowhite_esc(arg);
		    if (STRNCMP(arg, "icon=", 5) == 0)
		    {
			arg += 5;
			vim_free(sp->sn_icon);
			sp->sn_icon = vim_strnsave(arg, (int)(p - arg));
			backslash_halve(sp->sn_icon);
#ifdef FEAT_SIGN_ICONS
			if (gui.in_use)
			{
			    out_flush();
			    if (sp->sn_image != NULL)
				gui_mch_destroy_sign(sp->sn_image);
			    sp->sn_image = gui_mch_register_sign(sp->sn_icon);
			}
#endif
		    }
		    else if (STRNCMP(arg, "text=", 5) == 0)
		    {
			char_u	*s;
			int	cells;
			int	len;

			arg += 5;
#ifdef FEAT_MBYTE
			/* Count cells and check for non-printable chars */
			if (has_mbyte)
			{
			    cells = 0;
			    for (s = arg; s < p; s += (*mb_ptr2len)(s))
			    {
				if (!vim_isprintc((*mb_ptr2char)(s)))
				    break;
				cells += (*mb_ptr2cells)(s);
			    }
			}
			else
#endif
			{
			    for (s = arg; s < p; ++s)
				if (!vim_isprintc(*s))
				    break;
			    cells = (int)(s - arg);
			}
			/* Currently must be one or two display cells */
			if (s != p || cells < 1 || cells > 2)
			{
			    *p = NUL;
			    EMSG2(_("E239: Invalid sign text: %s"), arg);
			    return;
			}

			vim_free(sp->sn_text);
			/* Allocate one byte more if we need to pad up
			 * with a space. */
			len = (int)(p - arg + ((cells == 1) ? 1 : 0));
			sp->sn_text = vim_strnsave(arg, len);

			if (sp->sn_text != NULL && cells == 1)
			    STRCPY(sp->sn_text + len - 1, " ");
		    }
		    else if (STRNCMP(arg, "linehl=", 7) == 0)
		    {
			arg += 7;
			sp->sn_line_hl = syn_check_group(arg, (int)(p - arg));
		    }
		    else if (STRNCMP(arg, "texthl=", 7) == 0)
		    {
			arg += 7;
			sp->sn_text_hl = syn_check_group(arg, (int)(p - arg));
		    }
		    else
		    {
			EMSG2(_(e_invarg2), arg);
			return;
		    }
		}
	    }
	    else if (sp == NULL)
		EMSG2(_("E155: Unknown sign: %s"), arg);
	    else if (idx == SIGNCMD_LIST)
		/* ":sign list {name}" */
		sign_list_defined(sp);
	    else
		/* ":sign undefine {name}" */
		sign_undefine(sp, sp_prev);
	}
    }
    else
    {
	int		id = -1;
	linenr_T	lnum = -1;
	char_u		*sign_name = NULL;
	char_u		*arg1;

	if (*arg == NUL)
	{
	    if (idx == SIGNCMD_PLACE)
	    {
		/* ":sign place": list placed signs in all buffers */
		sign_list_placed(NULL);
	    }
	    else if (idx == SIGNCMD_UNPLACE)
	    {
		/* ":sign unplace": remove placed sign at cursor */
		id = buf_findsign_id(curwin->w_buffer, curwin->w_cursor.lnum);
		if (id > 0)
		{
		    buf_delsign(curwin->w_buffer, id);
		    update_debug_sign(curwin->w_buffer, curwin->w_cursor.lnum);
		}
		else
		    EMSG(_("E159: Missing sign number"));
	    }
	    else
		EMSG(_(e_argreq));
	    return;
	}

	if (idx == SIGNCMD_UNPLACE && arg[0] == '*' && arg[1] == NUL)
	{
	    /* ":sign unplace *": remove all placed signs */
	    buf_delete_all_signs();
	    return;
	}

	/* first arg could be placed sign id */
	arg1 = arg;
	if (VIM_ISDIGIT(*arg))
	{
	    id = getdigits(&arg);
	    if (!vim_iswhite(*arg) && *arg != NUL)
	    {
		id = -1;
		arg = arg1;
	    }
	    else
	    {
		arg = skipwhite(arg);
		if (idx == SIGNCMD_UNPLACE && *arg == NUL)
		{
		    /* ":sign unplace {id}": remove placed sign by number */
		    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
			if ((lnum = buf_delsign(buf, id)) != 0)
			    update_debug_sign(buf, lnum);
		    return;
		}
	    }
	}

	/*
	 * Check for line={lnum} name={name} and file={fname} or buffer={nr}.
	 * Leave "arg" pointing to {fname}.
	 */
	for (;;)
	{
	    if (STRNCMP(arg, "line=", 5) == 0)
	    {
		arg += 5;
		lnum = atoi((char *)arg);
		arg = skiptowhite(arg);
	    }
	    else if (STRNCMP(arg, "name=", 5) == 0)
	    {
		arg += 5;
		sign_name = arg;
		arg = skiptowhite(arg);
		if (*arg != NUL)
		    *arg++ = NUL;
		while (sign_name[0] == '0' && sign_name[1] != NUL)
		    ++sign_name;
	    }
	    else if (STRNCMP(arg, "file=", 5) == 0)
	    {
		arg += 5;
		buf = buflist_findname(arg);
		break;
	    }
	    else if (STRNCMP(arg, "buffer=", 7) == 0)
	    {
		arg += 7;
		buf = buflist_findnr((int)getdigits(&arg));
		if (*skipwhite(arg) != NUL)
		    EMSG(_(e_trailing));
		break;
	    }
	    else
	    {
		EMSG(_(e_invarg));
		return;
	    }
	    arg = skipwhite(arg);
	}

	if (buf == NULL)
	{
	    EMSG2(_("E158: Invalid buffer name: %s"), arg);
	}
	else if (id <= 0)
	{
	    if (lnum >= 0 || sign_name != NULL)
		EMSG(_(e_invarg));
	    else
		/* ":sign place file={fname}": list placed signs in one file */
		sign_list_placed(buf);
	}
	else if (idx == SIGNCMD_JUMP)
	{
	    /* ":sign jump {id} file={fname}" */
	    if (lnum >= 0 || sign_name != NULL)
		EMSG(_(e_invarg));
	    else if ((lnum = buf_findsign(buf, id)) > 0)
	    {				/* goto a sign ... */
		if (buf_jump_open_win(buf) != NULL)
		{			/* ... in a current window */
		    curwin->w_cursor.lnum = lnum;
		    check_cursor_lnum();
		    beginline(BL_WHITE);
		}
		else
		{			/* ... not currently in a window */
		    char_u	*cmd;

		    cmd = alloc((unsigned)STRLEN(buf->b_fname) + 25);
		    if (cmd == NULL)
			return;
		    sprintf((char *)cmd, "e +%ld %s", (long)lnum, buf->b_fname);
		    do_cmdline_cmd(cmd);
		    vim_free(cmd);
		}
#ifdef FEAT_FOLDING
		foldOpenCursor();
#endif
	    }
	    else
		EMSGN(_("E157: Invalid sign ID: %ld"), id);
	}
	else if (idx == SIGNCMD_UNPLACE)
	{
	    /* ":sign unplace {id} file={fname}" */
	    if (lnum >= 0 || sign_name != NULL)
		EMSG(_(e_invarg));
	    else
	    {
		lnum = buf_delsign(buf, id);
		update_debug_sign(buf, lnum);
	    }
	}
	    /* idx == SIGNCMD_PLACE */
	else if (sign_name != NULL)
	{
	    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
		if (STRCMP(sp->sn_name, sign_name) == 0)
		    break;
	    if (sp == NULL)
	    {
		EMSG2(_("E155: Unknown sign: %s"), sign_name);
		return;
	    }
	    if (lnum > 0)
		/* ":sign place {id} line={lnum} name={name} file={fname}":
		 * place a sign */
		buf_addsign(buf, id, lnum, sp->sn_typenr);
	    else
		/* ":sign place {id} file={fname}": change sign type */
		lnum = buf_change_sign_type(buf, id, sp->sn_typenr);
	    update_debug_sign(buf, lnum);
	}
	else
	    EMSG(_(e_invarg));
    }
}

#if defined(FEAT_SIGN_ICONS) || defined(PROTO)
/*
 * Allocate the icons.  Called when the GUI has started.  Allows defining
 * signs before it starts.
 */
    void
sign_gui_started()
{
    sign_T	*sp;

    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	if (sp->sn_icon != NULL)
	    sp->sn_image = gui_mch_register_sign(sp->sn_icon);
}
#endif

/*
 * List one sign.
 */
    static void
sign_list_defined(sp)
    sign_T	*sp;
{
    char_u	*p;

    smsg((char_u *)"sign %s", sp->sn_name);
    if (sp->sn_icon != NULL)
    {
	MSG_PUTS(" icon=");
	msg_outtrans(sp->sn_icon);
#ifdef FEAT_SIGN_ICONS
	if (sp->sn_image == NULL)
	    MSG_PUTS(_(" (NOT FOUND)"));
#else
	MSG_PUTS(_(" (not supported)"));
#endif
    }
    if (sp->sn_text != NULL)
    {
	MSG_PUTS(" text=");
	msg_outtrans(sp->sn_text);
    }
    if (sp->sn_line_hl > 0)
    {
	MSG_PUTS(" linehl=");
	p = get_highlight_name(NULL, sp->sn_line_hl - 1);
	if (p == NULL)
	    MSG_PUTS("NONE");
	else
	    msg_puts(p);
    }
    if (sp->sn_text_hl > 0)
    {
	MSG_PUTS(" texthl=");
	p = get_highlight_name(NULL, sp->sn_text_hl - 1);
	if (p == NULL)
	    MSG_PUTS("NONE");
	else
	    msg_puts(p);
    }
}

/*
 * Undefine a sign and free its memory.
 */
    static void
sign_undefine(sp, sp_prev)
    sign_T	*sp;
    sign_T	*sp_prev;
{
    vim_free(sp->sn_name);
    vim_free(sp->sn_icon);
#ifdef FEAT_SIGN_ICONS
    if (sp->sn_image != NULL)
    {
	out_flush();
	gui_mch_destroy_sign(sp->sn_image);
    }
#endif
    vim_free(sp->sn_text);
    if (sp_prev == NULL)
	first_sign = sp->sn_next;
    else
	sp_prev->sn_next = sp->sn_next;
    vim_free(sp);
}

/*
 * Get highlighting attribute for sign "typenr".
 * If "line" is TRUE: line highl, if FALSE: text highl.
 */
    int
sign_get_attr(typenr, line)
    int		typenr;
    int		line;
{
    sign_T	*sp;

    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	if (sp->sn_typenr == typenr)
	{
	    if (line)
	    {
		if (sp->sn_line_hl > 0)
		    return syn_id2attr(sp->sn_line_hl);
	    }
	    else
	    {
		if (sp->sn_text_hl > 0)
		    return syn_id2attr(sp->sn_text_hl);
	    }
	    break;
	}
    return 0;
}

/*
 * Get text mark for sign "typenr".
 * Returns NULL if there isn't one.
 */
    char_u *
sign_get_text(typenr)
    int		typenr;
{
    sign_T	*sp;

    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	if (sp->sn_typenr == typenr)
	    return sp->sn_text;
    return NULL;
}

#if defined(FEAT_SIGN_ICONS) || defined(PROTO)
    void *
sign_get_image(typenr)
    int		typenr;		/* the attribute which may have a sign */
{
    sign_T	*sp;

    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	if (sp->sn_typenr == typenr)
	    return sp->sn_image;
    return NULL;
}
#endif

/*
 * Get the name of a sign by its typenr.
 */
    char_u *
sign_typenr2name(typenr)
    int		typenr;
{
    sign_T	*sp;

    for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	if (sp->sn_typenr == typenr)
	    return sp->sn_name;
    return (char_u *)_("[Deleted]");
}

#if defined(EXITFREE) || defined(PROTO)
/*
 * Undefine/free all signs.
 */
    void
free_signs()
{
    while (first_sign != NULL)
	sign_undefine(first_sign, NULL);
}
#endif

#if defined(FEAT_CMDL_COMPL) || defined(PROTO)
static enum
{
    EXP_SUBCMD,		/* expand :sign sub-commands */
    EXP_DEFINE,		/* expand :sign define {name} args */
    EXP_PLACE,		/* expand :sign place {id} args */
    EXP_UNPLACE,	/* expand :sign unplace" */
    EXP_SIGN_NAMES	/* expand with name of placed signs */
} expand_what;

/*
 * Function given to ExpandGeneric() to obtain the sign command
 * expansion.
 */
    char_u *
get_sign_name(xp, idx)
    expand_T	*xp UNUSED;
    int		idx;
{
    sign_T	*sp;
    int		current_idx;

    switch (expand_what)
    {
    case EXP_SUBCMD:
	return (char_u *)cmds[idx];
    case EXP_DEFINE:
	{
	    char *define_arg[] =
	    {
		"icon=", "linehl=", "text=", "texthl=", NULL
	    };
	    return (char_u *)define_arg[idx];
	}
    case EXP_PLACE:
	{
	    char *place_arg[] =
	    {
		"line=", "name=", "file=", "buffer=", NULL
	    };
	    return (char_u *)place_arg[idx];
	}
    case EXP_UNPLACE:
	{
	    char *unplace_arg[] = { "file=", "buffer=", NULL };
	    return (char_u *)unplace_arg[idx];
	}
    case EXP_SIGN_NAMES:
	/* Complete with name of signs already defined */
	current_idx = 0;
	for (sp = first_sign; sp != NULL; sp = sp->sn_next)
	    if (current_idx++ == idx)
		return sp->sn_name;
	return NULL;
    default:
	return NULL;
    }
}

/*
 * Handle command line completion for :sign command.
 */
    void
set_context_in_sign_cmd(xp, arg)
    expand_T	*xp;
    char_u	*arg;
{
    char_u	*p;
    char_u	*end_subcmd;
    char_u	*last;
    int		cmd_idx;
    char_u	*begin_subcmd_args;

    /* Default: expand subcommands. */
    xp->xp_context = EXPAND_SIGN;
    expand_what = EXP_SUBCMD;
    xp->xp_pattern = arg;

    end_subcmd = skiptowhite(arg);
    if (*end_subcmd == NUL)
	/* expand subcmd name
	 * :sign {subcmd}<CTRL-D>*/
	return;

    cmd_idx = sign_cmd_idx(arg, end_subcmd);

    /* :sign {subcmd} {subcmd_args}
     *		      |
     *		      begin_subcmd_args */
    begin_subcmd_args = skipwhite(end_subcmd);
    p = skiptowhite(begin_subcmd_args);
    if (*p == NUL)
    {
	/*
	 * Expand first argument of subcmd when possible.
	 * For ":jump {id}" and ":unplace {id}", we could
	 * possibly expand the ids of all signs already placed.
	 */
	xp->xp_pattern = begin_subcmd_args;
	switch (cmd_idx)
	{
	    case SIGNCMD_LIST:
	    case SIGNCMD_UNDEFINE:
		/* :sign list <CTRL-D>
		 * :sign undefine <CTRL-D> */
		expand_what = EXP_SIGN_NAMES;
		break;
	    default:
		xp->xp_context = EXPAND_NOTHING;
	}
	return;
    }

    /* expand last argument of subcmd */

    /* :sign define {name} {args}...
     *		    |
     *		    p */

    /* Loop until reaching last argument. */
    do
    {
	p = skipwhite(p);
	last = p;
	p = skiptowhite(p);
    } while (*p != NUL);

    p = vim_strchr(last, '=');

    /* :sign define {name} {args}... {last}=
     *				     |	   |
     *				  last	   p */
    if (p == NUL)
    {
	/* Expand last argument name (before equal sign). */
	xp->xp_pattern = last;
	switch (cmd_idx)
	{
	    case SIGNCMD_DEFINE:
		expand_what = EXP_DEFINE;
		break;
	    case SIGNCMD_PLACE:
		expand_what = EXP_PLACE;
		break;
	    case SIGNCMD_JUMP:
	    case SIGNCMD_UNPLACE:
		expand_what = EXP_UNPLACE;
		break;
	    default:
		xp->xp_context = EXPAND_NOTHING;
	}
    }
    else
    {
	/* Expand last argument value (after equal sign). */
	xp->xp_pattern = p + 1;
	switch (cmd_idx)
	{
	    case SIGNCMD_DEFINE:
		if (STRNCMP(last, "texthl", p - last) == 0 ||
		    STRNCMP(last, "linehl", p - last) == 0)
		    xp->xp_context = EXPAND_HIGHLIGHT;
		else if (STRNCMP(last, "icon", p - last) == 0)
		    xp->xp_context = EXPAND_FILES;
		else
		    xp->xp_context = EXPAND_NOTHING;
		break;
	    case SIGNCMD_PLACE:
		if (STRNCMP(last, "name", p - last) == 0)
		    expand_what = EXP_SIGN_NAMES;
		else
		    xp->xp_context = EXPAND_NOTHING;
		break;
	    default:
		xp->xp_context = EXPAND_NOTHING;
	}
    }
}
#endif
#endif

#if defined(FEAT_GUI) || defined(FEAT_CLIENTSERVER) || defined(PROTO)
/*
 * ":drop"
 * Opens the first argument in a window.  When there are two or more arguments
 * the argument list is redefined.
 */
    void
ex_drop(eap)
    exarg_T	*eap;
{
    int		split = FALSE;
    win_T	*wp;
    buf_T	*buf;
# ifdef FEAT_WINDOWS
    tabpage_T	*tp;
# endif

    /*
     * Check if the first argument is already being edited in a window.  If
     * so, jump to that window.
     * We would actually need to check all arguments, but that's complicated
     * and mostly only one file is dropped.
     * This also ignores wildcards, since it is very unlikely the user is
     * editing a file name with a wildcard character.
     */
    set_arglist(eap->arg);

    /*
     * Expanding wildcards may result in an empty argument list.  E.g. when
     * editing "foo.pyc" and ".pyc" is in 'wildignore'.  Assume that we
     * already did an error message for this.
     */
    if (ARGCOUNT == 0)
	return;

# ifdef FEAT_WINDOWS
    if (cmdmod.tab)
    {
	/* ":tab drop file ...": open a tab for each argument that isn't
	 * edited in a window yet.  It's like ":tab all" but without closing
	 * windows or tabs. */
	ex_all(eap);
    }
    else
# endif
    {
	/* ":drop file ...": Edit the first argument.  Jump to an existing
	 * window if possible, edit in current window if the current buffer
	 * can be abandoned, otherwise open a new window. */
	buf = buflist_findnr(ARGLIST[0].ae_fnum);

	FOR_ALL_TAB_WINDOWS(tp, wp)
	{
	    if (wp->w_buffer == buf)
	    {
# ifdef FEAT_WINDOWS
		goto_tabpage_win(tp, wp);
# endif
		curwin->w_arg_idx = 0;
		return;
	    }
	}

	/*
	 * Check whether the current buffer is changed. If so, we will need
	 * to split the current window or data could be lost.
	 * Skip the check if the 'hidden' option is set, as in this case the
	 * buffer won't be lost.
	 */
	if (!P_HID(curbuf))
	{
# ifdef FEAT_WINDOWS
	    ++emsg_off;
# endif
	    split = check_changed(curbuf, TRUE, FALSE, FALSE, FALSE);
# ifdef FEAT_WINDOWS
	    --emsg_off;
# else
	    if (split)
		return;
# endif
	}

	/* Fake a ":sfirst" or ":first" command edit the first argument. */
	if (split)
	{
	    eap->cmdidx = CMD_sfirst;
	    eap->cmd[0] = 's';
	}
	else
	    eap->cmdidx = CMD_first;
	ex_rewind(eap);
    }
}
#endif