new file mode 100644
--- /dev/null
+++ b/src/quickfix.c
@@ -0,0 +1,2232 @@
+/* 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.
+ */
+
+/*
+ * quickfix.c: functions for quickfix mode, using a file with error messages
+ */
+
+#include "vim.h"
+
+#if defined(FEAT_QUICKFIX) || defined(PROTO)
+
+struct dir_stack_T
+{
+    struct dir_stack_T	*next;
+    char_u		*dirname;
+};
+
+static struct dir_stack_T   *dir_stack = NULL;
+
+/*
+ * for each error the next struct is allocated and linked in a list
+ */
+struct qf_line
+{
+    struct qf_line  *qf_next;	/* pointer to next error in the list */
+    struct qf_line  *qf_prev;	/* pointer to previous error in the list */
+    linenr_T	     qf_lnum;	/* line number where the error occurred */
+    int		     qf_fnum;	/* file number for the line */
+    int		     qf_col;	/* column where the error occurred */
+    int		     qf_nr;	/* error number */
+    char_u	    *qf_text;	/* description of the error */
+    char_u	     qf_virt_col; /* set to TRUE if qf_col is screen column */
+    char_u	     qf_cleared;/* set to TRUE if line has been deleted */
+    char_u	     qf_type;	/* type of the error (mostly 'E'); 1 for
+				   :helpgrep */
+    char_u	     qf_valid;	/* valid error message detected */
+};
+
+/*
+ * There is a stack of error lists.
+ */
+#define LISTCOUNT   10
+
+struct qf_list
+{
+    struct qf_line *qf_start;	/* pointer to the first error */
+    struct qf_line *qf_ptr;	/* pointer to the current error */
+    int  qf_count;		/* number of errors (0 means no error list) */
+    int  qf_index;		/* current index in the error list */
+    int  qf_nonevalid;		/* TRUE if not a single valid entry found */
+} qf_lists[LISTCOUNT];
+
+static int	qf_curlist = 0;	/* current error list */
+static int	qf_listcount = 0;   /* current number of lists */
+
+#define FMT_PATTERNS 9		/* maximum number of % recognized */
+
+/*
+ * Structure used to hold the info of one part of 'errorformat'
+ */
+struct eformat
+{
+    regprog_T	    *prog;	/* pre-formatted part of 'errorformat' */
+    struct eformat  *next;	/* pointer to next (NULL if last) */
+    char_u	    addr[FMT_PATTERNS]; /* indices of used % patterns */
+    char_u	    prefix;	/* prefix of this format line: */
+				/*   'D' enter directory */
+				/*   'X' leave directory */
+				/*   'A' start of multi-line message */
+				/*   'E' error message */
+				/*   'W' warning message */
+				/*   'I' informational message */
+				/*   'C' continuation line */
+				/*   'Z' end of multi-line message */
+				/*   'G' general, unspecific message */
+				/*   'P' push file (partial) message */
+				/*   'Q' pop/quit file (partial) message */
+				/*   'O' overread (partial) message */
+    char_u	    flags;	/* additional flags given in prefix */
+				/*   '-' do not include this line */
+};
+
+static void	qf_new_list __ARGS((void));
+static int	qf_add_entry __ARGS((struct qf_line **prevp, char_u *dir, char_u *fname, char_u *mesg, long lnum, int col, int virt_col, int nr, int type, int valid));
+static void	qf_msg __ARGS((void));
+static void	qf_free __ARGS((int idx));
+static char_u	*qf_types __ARGS((int, int));
+static int	qf_get_fnum __ARGS((char_u *, char_u *));
+static char_u	*qf_push_dir __ARGS((char_u *, struct dir_stack_T **));
+static char_u	*qf_pop_dir __ARGS((struct dir_stack_T **));
+static char_u	*qf_guess_filepath __ARGS((char_u *));
+static void	qf_fmt_text __ARGS((char_u *text, char_u *buf, int bufsize));
+static void	qf_clean_dir_stack __ARGS((struct dir_stack_T **));
+#ifdef FEAT_WINDOWS
+static int	qf_win_pos_update __ARGS((int old_qf_index));
+static buf_T	*qf_find_buf __ARGS((void));
+static void	qf_update_buffer __ARGS((void));
+static void	qf_fill_buffer __ARGS((void));
+#endif
+static char_u	*get_mef_name __ARGS((void));
+
+/*
+ * Read the errorfile into memory, line by line, building the error list.
+ * Return -1 for error, number of errors for success.
+ */
+    int
+qf_init(efile, errorformat, newlist)
+    char_u	    *efile;
+    char_u	    *errorformat;
+    int		    newlist;		/* TRUE: start a new error list */
+{
+    char_u	    *namebuf;
+    char_u	    *errmsg;
+    char_u	    *fmtstr = NULL;
+    int		    col = 0;
+    char_u	    use_virt_col = FALSE;
+    int		    type = 0;
+    int		    valid;
+    long	    lnum = 0L;
+    int		    enr = 0;
+    FILE	    *fd;
+    struct qf_line  *qfprev = NULL;	/* init to make SASC shut up */
+    char_u	    *efmp;
+    struct eformat  *fmt_first = NULL;
+    struct eformat  *fmt_last = NULL;
+    struct eformat  *fmt_ptr;
+    char_u	    *efm;
+    char_u	    *ptr;
+    char_u	    *srcptr;
+    int		    len;
+    int		    i;
+    int		    round;
+    int		    idx = 0;
+    int		    multiline = FALSE;
+    int		    multiignore = FALSE;
+    int		    multiscan = FALSE;
+    int		    retval = -1;	/* default: return error flag */
+    char_u	    *directory = NULL;
+    char_u	    *currfile = NULL;
+    char_u	    *tail = NULL;
+    struct dir_stack_T  *file_stack = NULL;
+    regmatch_T	    regmatch;
+    static struct fmtpattern
+    {
+	char_u	convchar;
+	char	*pattern;
+    }		    fmt_pat[FMT_PATTERNS] =
+		    {
+			{'f', "\\f\\+"},
+			{'n', "\\d\\+"},
+			{'l', "\\d\\+"},
+			{'c', "\\d\\+"},
+			{'t', "."},
+			{'m', ".\\+"},
+			{'r', ".*"},
+			{'p', "[- .]*"},
+			{'v', "\\d\\+"}
+		    };
+
+    if (efile == NULL)
+	return FAIL;
+
+    namebuf = alloc(CMDBUFFSIZE + 1);
+    errmsg = alloc(CMDBUFFSIZE + 1);
+    if (namebuf == NULL || errmsg == NULL)
+	goto qf_init_end;
+
+    if ((fd = mch_fopen((char *)efile, "r")) == NULL)
+    {
+	EMSG2(_(e_openerrf), efile);
+	goto qf_init_end;
+    }
+
+    if (newlist || qf_curlist == qf_listcount)
+	/* make place for a new list */
+	qf_new_list();
+    else if (qf_lists[qf_curlist].qf_count > 0)
+	/* Adding to existing list, find last entry. */
+	for (qfprev = qf_lists[qf_curlist].qf_start;
+			    qfprev->qf_next != qfprev; qfprev = qfprev->qf_next)
+	    ;
+
+/*
+ * Each part of the format string is copied and modified from errorformat to
+ * regex prog.  Only a few % characters are allowed.
+ */
+    /* Use the local value of 'errorformat' if it's set. */
+    if (errorformat == p_efm && *curbuf->b_p_efm != NUL)
+	efm = curbuf->b_p_efm;
+    else
+	efm = errorformat;
+    /*
+     * Get some space to modify the format string into.
+     */
+    i = (FMT_PATTERNS * 3) + ((int)STRLEN(efm) << 2);
+    for (round = FMT_PATTERNS; round > 0; )
+	i += (int)STRLEN(fmt_pat[--round].pattern);
+#ifdef COLON_IN_FILENAME
+    i += 12; /* "%f" can become twelve chars longer */
+#else
+    i += 2; /* "%f" can become two chars longer */
+#endif
+    if ((fmtstr = alloc(i)) == NULL)
+	goto error2;
+
+    while (efm[0])
+    {
+	/*
+	 * Allocate a new eformat structure and put it at the end of the list
+	 */
+	fmt_ptr = (struct eformat *)alloc((unsigned)sizeof(struct eformat));
+	if (fmt_ptr == NULL)
+	    goto error2;
+	if (fmt_first == NULL)	    /* first one */
+	    fmt_first = fmt_ptr;
+	else
+	    fmt_last->next = fmt_ptr;
+	fmt_last = fmt_ptr;
+	fmt_ptr->prefix = NUL;
+	fmt_ptr->flags = NUL;
+	fmt_ptr->next = NULL;
+	fmt_ptr->prog = NULL;
+	for (round = FMT_PATTERNS; round > 0; )
+	    fmt_ptr->addr[--round] = NUL;
+	/* round is 0 now */
+
+	/*
+	 * Isolate one part in the 'errorformat' option
+	 */
+	for (len = 0; efm[len] != NUL && efm[len] != ','; ++len)
+	    if (efm[len] == '\\' && efm[len + 1] != NUL)
+		++len;
+
+	/*
+	 * Build regexp pattern from current 'errorformat' option
+	 */
+	ptr = fmtstr;
+	*ptr++ = '^';
+	for (efmp = efm; efmp < efm + len; ++efmp)
+	{
+	    if (*efmp == '%')
+	    {
+		++efmp;
+		for (idx = 0; idx < FMT_PATTERNS; ++idx)
+		    if (fmt_pat[idx].convchar == *efmp)
+			break;
+		if (idx < FMT_PATTERNS)
+		{
+		    if (fmt_ptr->addr[idx])
+		    {
+			sprintf((char *)errmsg,
+				_("E372: Too many %%%c in format string"), *efmp);
+			EMSG(errmsg);
+			goto error2;
+		    }
+		    if ((idx
+				&& idx < 6
+				&& vim_strchr((char_u *)"DXOPQ",
+						     fmt_ptr->prefix) != NULL)
+			    || (idx == 6
+				&& vim_strchr((char_u *)"OPQ",
+						    fmt_ptr->prefix) == NULL))
+		    {
+			sprintf((char *)errmsg,
+				_("E373: Unexpected %%%c in format string"), *efmp);
+			EMSG(errmsg);
+			goto error2;
+		    }
+		    fmt_ptr->addr[idx] = (char_u)++round;
+		    *ptr++ = '\\';
+		    *ptr++ = '(';
+#ifdef BACKSLASH_IN_FILENAME
+		    if (*efmp == 'f')
+		    {
+			/* Also match "c:" in the file name, even when
+			 * checking for a colon next: "%f:".
+			 * "\%(\a:\)\=" */
+			STRCPY(ptr, "\\%(\\a:\\)\\=");
+			ptr += 10;
+		    }
+#endif
+		    if (*efmp == 'f' && efmp[1] != NUL
+					 && efmp[1] != '\\' && efmp[1] != '%')
+		    {
+			/* A file name may contain spaces, but this isn't in
+			 * "\f".  use "[^x]\+" instead (x is next character) */
+			*ptr++ = '[';
+			*ptr++ = '^';
+			*ptr++ = efmp[1];
+			*ptr++ = ']';
+			*ptr++ = '\\';
+			*ptr++ = '+';
+		    }
+		    else
+		    {
+			srcptr = (char_u *)fmt_pat[idx].pattern;
+			while ((*ptr = *srcptr++) != NUL)
+			    ++ptr;
+		    }
+		    *ptr++ = '\\';
+		    *ptr++ = ')';
+		}
+		else if (*efmp == '*')
+		{
+		    if (*++efmp == '[' || *efmp == '\\')
+		    {
+			if ((*ptr++ = *efmp) == '[')	/* %*[^a-z0-9] etc. */
+			{
+			    if (efmp[1] == '^')
+				*ptr++ = *++efmp;
+			    if (efmp < efm + len)
+			    {
+				*ptr++ = *++efmp;	    /* could be ']' */
+				while (efmp < efm + len
+					&& (*ptr++ = *++efmp) != ']')
+				    /* skip */;
+				if (efmp == efm + len)
+				{
+				    EMSG(_("E374: Missing ] in format string"));
+				    goto error2;
+				}
+			    }
+			}
+			else if (efmp < efm + len)	/* %*\D, %*\s etc. */
+			    *ptr++ = *++efmp;
+			*ptr++ = '\\';
+			*ptr++ = '+';
+		    }
+		    else
+		    {
+			/* TODO: scanf()-like: %*ud, %*3c, %*f, ... ? */
+			sprintf((char *)errmsg,
+				_("E375: Unsupported %%%c in format string"), *efmp);
+			EMSG(errmsg);
+			goto error2;
+		    }
+		}
+		else if (vim_strchr((char_u *)"%\\.^$~[", *efmp) != NULL)
+		    *ptr++ = *efmp;		/* regexp magic characters */
+		else if (*efmp == '#')
+		    *ptr++ = '*';
+		else if (efmp == efm + 1)		/* analyse prefix */
+		{
+		    if (vim_strchr((char_u *)"+-", *efmp) != NULL)
+			fmt_ptr->flags = *efmp++;
+		    if (vim_strchr((char_u *)"DXAEWICZGOPQ", *efmp) != NULL)
+			fmt_ptr->prefix = *efmp;
+		    else
+		    {
+			sprintf((char *)errmsg,
+				_("E376: Invalid %%%c in format string prefix"), *efmp);
+			EMSG(errmsg);
+			goto error2;
+		    }
+		}
+		else
+		{
+		    sprintf((char *)errmsg,
+			    _("E377: Invalid %%%c in format string"), *efmp);
+		    EMSG(errmsg);
+		    goto error2;
+		}
+	    }
+	    else			/* copy normal character */
+	    {
+		if (*efmp == '\\' && efmp + 1 < efm + len)
+		    ++efmp;
+		else if (vim_strchr((char_u *)".*^$~[", *efmp) != NULL)
+		    *ptr++ = '\\';	/* escape regexp atoms */
+		if (*efmp)
+		    *ptr++ = *efmp;
+	    }
+	}
+	*ptr++ = '$';
+	*ptr = NUL;
+	if ((fmt_ptr->prog = vim_regcomp(fmtstr, RE_MAGIC + RE_STRING)) == NULL)
+	    goto error2;
+	/*
+	 * Advance to next part
+	 */
+	efm = skip_to_option_part(efm + len);	/* skip comma and spaces */
+    }
+    if (fmt_first == NULL)	/* nothing found */
+    {
+	EMSG(_("E378: 'errorformat' contains no pattern"));
+	goto error2;
+    }
+
+    /*
+     * got_int is reset here, because it was probably set when killing the
+     * ":make" command, but we still want to read the errorfile then.
+     */
+    got_int = FALSE;
+
+    /* Always ignore case when looking for a matching error. */
+    regmatch.rm_ic = TRUE;
+
+    /*
+     * Read the lines in the error file one by one.
+     * Try to recognize one of the error formats in each line.
+     */
+    while (fgets((char *)IObuff, CMDBUFFSIZE - 2, fd) != NULL && !got_int)
+    {
+	IObuff[CMDBUFFSIZE - 2] = NUL;  /* for very long lines */
+	if ((efmp = vim_strrchr(IObuff, '\n')) != NULL)
+	    *efmp = NUL;
+#ifdef USE_CRNL
+	if ((efmp = vim_strrchr(IObuff, '\r')) != NULL)
+	    *efmp = NUL;
+#endif
+
+	/*
+	 * Try to match each part of 'errorformat' until we find a complete
+	 * match or no match.
+	 */
+	valid = TRUE;
+restofline:
+	for (fmt_ptr = fmt_first; fmt_ptr != NULL; fmt_ptr = fmt_ptr->next)
+	{
+	    idx = fmt_ptr->prefix;
+	    if (multiscan && vim_strchr((char_u *)"OPQ", idx) == NULL)
+		continue;
+	    namebuf[0] = NUL;
+	    if (!multiscan)
+		errmsg[0] = NUL;
+	    lnum = 0;
+	    col = 0;
+	    use_virt_col = FALSE;
+	    enr = -1;
+	    type = 0;
+	    tail = NULL;
+
+	    regmatch.regprog = fmt_ptr->prog;
+	    if (vim_regexec(&regmatch, IObuff, (colnr_T)0))
+	    {
+		if ((idx == 'C' || idx == 'Z') && !multiline)
+		    continue;
+		if (vim_strchr((char_u *)"EWI", idx) != NULL)
+		    type = idx;
+		else
+		    type = 0;
+		/*
+		 * Extract error message data from matched line
+		 */
+		if ((i = (int)fmt_ptr->addr[0]) > 0)		/* %f */
+		{
+		    len = (int)(regmatch.endp[i] - regmatch.startp[i]);
+		    STRNCPY(namebuf, regmatch.startp[i], len);
+		    namebuf[len] = NUL;
+		    if (vim_strchr((char_u *)"OPQ", idx) != NULL
+			    && mch_getperm(namebuf) == -1)
+			continue;
+		}
+		if ((i = (int)fmt_ptr->addr[1]) > 0)		/* %n */
+		    enr = (int)atol((char *)regmatch.startp[i]);
+		if ((i = (int)fmt_ptr->addr[2]) > 0)		/* %l */
+		    lnum = atol((char *)regmatch.startp[i]);
+		if ((i = (int)fmt_ptr->addr[3]) > 0)		/* %c */
+		    col = (int)atol((char *)regmatch.startp[i]);
+		if ((i = (int)fmt_ptr->addr[4]) > 0)		/* %t */
+		    type = *regmatch.startp[i];
+		if (fmt_ptr->flags ==  '+' && !multiscan)	/* %+ */
+		    STRCPY(errmsg, IObuff);
+		else if ((i = (int)fmt_ptr->addr[5]) > 0)	/* %m */
+		{
+		    len = (int)(regmatch.endp[i] - regmatch.startp[i]);
+		    STRNCPY(errmsg, regmatch.startp[i], len);
+		    errmsg[len] = NUL;
+		}
+		if ((i = (int)fmt_ptr->addr[6]) > 0)		/* %r */
+		    tail = regmatch.startp[i];
+		if ((i = (int)fmt_ptr->addr[7]) > 0)		/* %p */
+		{
+		    col = (int)(regmatch.endp[i] - regmatch.startp[i] + 1);
+		    if (*((char_u *)regmatch.startp[i]) != TAB)
+			use_virt_col = TRUE;
+		}
+		if ((i = (int)fmt_ptr->addr[8]) > 0)		/* %v */
+		{
+		    col = (int)atol((char *)regmatch.startp[i]);
+		    use_virt_col = TRUE;
+		}
+		break;
+	    }
+	}
+	multiscan = FALSE;
+	if (!fmt_ptr || idx == 'D' || idx == 'X')
+	{
+	    if (fmt_ptr)
+	    {
+		if (idx == 'D')				/* enter directory */
+		{
+		    if (*namebuf == NUL)
+		    {
+			EMSG(_("E379: Missing or empty directory name"));
+			goto error2;
+		    }
+		    if ((directory = qf_push_dir(namebuf, &dir_stack)) == NULL)
+			goto error2;
+		}
+		else if (idx == 'X')			/* leave directory */
+		    directory = qf_pop_dir(&dir_stack);
+	    }
+	    namebuf[0] = NUL;		/* no match found, remove file name */
+	    lnum = 0;			/* don't jump to this line */
+	    valid = FALSE;
+	    STRCPY(errmsg, IObuff);	/* copy whole line to error message */
+	    if (!fmt_ptr)
+		multiline = multiignore = FALSE;
+	}
+	else if (fmt_ptr)
+	{
+	    if (vim_strchr((char_u *)"AEWI", idx) != NULL)
+		multiline = TRUE;	/* start of a multi-line message */
+	    else if (vim_strchr((char_u *)"CZ", idx) != NULL)
+	    {				/* continuation of multi-line msg */
+		if (qfprev == NULL)
+		    goto error2;
+		if (*errmsg && !multiignore)
+		{
+		    len = (int)STRLEN(qfprev->qf_text);
+		    if ((ptr = alloc((unsigned)(len + STRLEN(errmsg) + 2)))
+								    == NULL)
+			goto error2;
+		    STRCPY(ptr, qfprev->qf_text);
+		    vim_free(qfprev->qf_text);
+		    qfprev->qf_text = ptr;
+		    *(ptr += len) = '\n';
+		    STRCPY(++ptr, errmsg);
+		}
+		if (qfprev->qf_nr == -1)
+		    qfprev->qf_nr = enr;
+		if (vim_isprintc(type) && !qfprev->qf_type)
+		    qfprev->qf_type = type;  /* only printable chars allowed */
+		if (!qfprev->qf_lnum)
+		    qfprev->qf_lnum = lnum;
+		if (!qfprev->qf_col)
+		    qfprev->qf_col = col;
+		qfprev->qf_virt_col = use_virt_col;
+		if (!qfprev->qf_fnum)
+		    qfprev->qf_fnum = qf_get_fnum(directory,
+					*namebuf || directory ? namebuf
+					  : currfile && valid ? currfile : 0);
+		if (idx == 'Z')
+		    multiline = multiignore = FALSE;
+		line_breakcheck();
+		continue;
+	    }
+	    else if (vim_strchr((char_u *)"OPQ", idx) != NULL)
+	    {
+		/* global file names */
+		valid = FALSE;
+		if (*namebuf == NUL || mch_getperm(namebuf) >= 0)
+		{
+		    if (*namebuf && idx == 'P')
+			currfile = qf_push_dir(namebuf, &file_stack);
+		    else if (idx == 'Q')
+			currfile = qf_pop_dir(&file_stack);
+		    *namebuf = NUL;
+		    if (tail && *tail)
+		    {
+			STRCPY(IObuff, skipwhite(tail));
+			multiscan = TRUE;
+			goto restofline;
+		    }
+		}
+	    }
+	    if (fmt_ptr->flags == '-')	/* generally exclude this line */
+	    {
+		if (multiline)
+		    multiignore = TRUE;	/* also exclude continuation lines */
+		continue;
+	    }
+	}
+
+	if (qf_add_entry(&qfprev,
+			directory,
+			*namebuf || directory
+			    ? namebuf
+			    : currfile && valid ? currfile : NULL,
+			errmsg,
+			lnum,
+			col,
+			use_virt_col,
+			enr,
+			type,
+			valid) == FAIL)
+	    goto error2;
+	line_breakcheck();
+    }
+    if (!ferror(fd))
+    {
+	if (qf_lists[qf_curlist].qf_index == 0)	/* no valid entry found */
+	{
+	    qf_lists[qf_curlist].qf_ptr = qf_lists[qf_curlist].qf_start;
+	    qf_lists[qf_curlist].qf_index = 1;
+	    qf_lists[qf_curlist].qf_nonevalid = TRUE;
+	}
+	else
+	{
+	    qf_lists[qf_curlist].qf_nonevalid = FALSE;
+	    if (qf_lists[qf_curlist].qf_ptr == NULL)
+		qf_lists[qf_curlist].qf_ptr = qf_lists[qf_curlist].qf_start;
+	}
+	retval = qf_lists[qf_curlist].qf_count;	/* return number of matches */
+	goto qf_init_ok;
+    }
+    EMSG(_(e_readerrf));
+error2:
+    qf_free(qf_curlist);
+    qf_listcount--;
+    if (qf_curlist > 0)
+	--qf_curlist;
+qf_init_ok:
+    fclose(fd);
+    for (fmt_ptr = fmt_first; fmt_ptr != NULL; fmt_ptr = fmt_first)
+    {
+	fmt_first = fmt_ptr->next;
+	vim_free(fmt_ptr->prog);
+	vim_free(fmt_ptr);
+    }
+    qf_clean_dir_stack(&dir_stack);
+    qf_clean_dir_stack(&file_stack);
+qf_init_end:
+    vim_free(namebuf);
+    vim_free(errmsg);
+    vim_free(fmtstr);
+
+#ifdef FEAT_WINDOWS
+    qf_update_buffer();
+#endif
+
+    return retval;
+}
+
+/*
+ * Prepare for adding a new quickfix list.
+ */
+    static void
+qf_new_list()
+{
+    int		i;
+
+    /*
+     * If the current entry is not the last entry, delete entries below
+     * the current entry.  This makes it possible to browse in a tree-like
+     * way with ":grep'.
+     */
+    while (qf_listcount > qf_curlist + 1)
+	qf_free(--qf_listcount);
+
+    /*
+     * When the stack is full, remove to oldest entry
+     * Otherwise, add a new entry.
+     */
+    if (qf_listcount == LISTCOUNT)
+    {
+	qf_free(0);
+	for (i = 1; i < LISTCOUNT; ++i)
+	    qf_lists[i - 1] = qf_lists[i];
+	qf_curlist = LISTCOUNT - 1;
+    }
+    else
+	qf_curlist = qf_listcount++;
+    qf_lists[qf_curlist].qf_index = 0;
+    qf_lists[qf_curlist].qf_count = 0;
+}
+
+/*
+ * Add an entry to the end of the list of errors.
+ * Returns OK or FAIL.
+ */
+    static int
+qf_add_entry(prevp, dir, fname, mesg, lnum, col, virt_col, nr, type, valid)
+    struct qf_line **prevp;	/* pointer to previously added entry or NULL */
+    char_u	*dir;		/* optional directory name */
+    char_u	*fname;		/* file name or NULL */
+    char_u	*mesg;		/* message */
+    long	lnum;		/* line number */
+    int		col;		/* column */
+    int		virt_col;	/* using virtual column */
+    int		nr;		/* error number */
+    int		type;		/* type character */
+    int		valid;		/* valid entry */
+{
+    struct qf_line *qfp;
+
+    if ((qfp = (struct qf_line *)alloc((unsigned)sizeof(struct qf_line)))
+								      == NULL)
+	return FAIL;
+    qfp->qf_fnum = qf_get_fnum(dir, fname);
+    if ((qfp->qf_text = vim_strsave(mesg)) == NULL)
+    {
+	vim_free(qfp);
+	return FAIL;
+    }
+    qfp->qf_lnum = lnum;
+    qfp->qf_col = col;
+    qfp->qf_virt_col = virt_col;
+    qfp->qf_nr = nr;
+    if (type != 1 && !vim_isprintc(type)) /* only printable chars allowed */
+	type = 0;
+    qfp->qf_type = type;
+    qfp->qf_valid = valid;
+
+    if (qf_lists[qf_curlist].qf_count == 0)	/* first element in the list */
+    {
+	qf_lists[qf_curlist].qf_start = qfp;
+	qfp->qf_prev = qfp;	/* first element points to itself */
+    }
+    else
+    {
+	qfp->qf_prev = *prevp;
+	(*prevp)->qf_next = qfp;
+    }
+    qfp->qf_next = qfp;	/* last element points to itself */
+    qfp->qf_cleared = FALSE;
+    *prevp = qfp;
+    ++qf_lists[qf_curlist].qf_count;
+    if (qf_lists[qf_curlist].qf_index == 0 && qfp->qf_valid)
+					    /* first valid entry */
+    {
+	qf_lists[qf_curlist].qf_index = qf_lists[qf_curlist].qf_count;
+	qf_lists[qf_curlist].qf_ptr = qfp;
+    }
+
+    return OK;
+}
+
+/*
+ * get buffer number for file "dir.name"
+ */
+    static int
+qf_get_fnum(directory, fname)
+    char_u   *directory;
+    char_u   *fname;
+{
+    if (fname == NULL || *fname == NUL)		/* no file name */
+	return 0;
+    {
+#ifdef RISCOS
+	/* Name is reported as `main.c', but file is `c.main' */
+	return ro_buflist_add(fname);
+#else
+	char_u	    *ptr;
+	int	    fnum;
+
+# ifdef VMS
+	vms_remove_version(fname);
+# endif
+# ifdef BACKSLASH_IN_FILENAME
+	if (directory != NULL)
+	    slash_adjust(directory);
+	slash_adjust(fname);
+# endif
+	if (directory != NULL && !vim_isAbsName(fname)
+		&& (ptr = concat_fnames(directory, fname, TRUE)) != NULL)
+	{
+	    /*
+	     * Here we check if the file really exists.
+	     * This should normally be true, but if make works without
+	     * "leaving directory"-messages we might have missed a
+	     * directory change.
+	     */
+	    if (mch_getperm(ptr) < 0)
+	    {
+		vim_free(ptr);
+		directory = qf_guess_filepath(fname);
+		if (directory)
+		    ptr = concat_fnames(directory, fname, TRUE);
+		else
+		    ptr = vim_strsave(fname);
+	    }
+	    /* Use concatenated directory name and file name */
+	    fnum = buflist_add(ptr, 0);
+	    vim_free(ptr);
+	    return fnum;
+	}
+	return buflist_add(fname, 0);
+#endif
+    }
+}
+
+/*
+ * push dirbuf onto the directory stack and return pointer to actual dir or
+ * NULL on error
+ */
+    static char_u *
+qf_push_dir(dirbuf, stackptr)
+    char_u		*dirbuf;
+    struct dir_stack_T	**stackptr;
+{
+    struct dir_stack_T  *ds_new;
+    struct dir_stack_T  *ds_ptr;
+
+    /* allocate new stack element and hook it in */
+    ds_new = (struct dir_stack_T *)alloc((unsigned)sizeof(struct dir_stack_T));
+    if (ds_new == NULL)
+	return NULL;
+
+    ds_new->next = *stackptr;
+    *stackptr = ds_new;
+
+    /* store directory on the stack */
+    if (vim_isAbsName(dirbuf)
+	    || (*stackptr)->next == NULL
+	    || (*stackptr && dir_stack != *stackptr))
+	(*stackptr)->dirname = vim_strsave(dirbuf);
+    else
+    {
+	/* Okay we don't have an absolute path.
+	 * dirbuf must be a subdir of one of the directories on the stack.
+	 * Let's search...
+	 */
+	ds_new = (*stackptr)->next;
+	(*stackptr)->dirname = NULL;
+	while (ds_new)
+	{
+	    vim_free((*stackptr)->dirname);
+	    (*stackptr)->dirname = concat_fnames(ds_new->dirname, dirbuf,
+		    TRUE);
+	    if (mch_isdir((*stackptr)->dirname) == TRUE)
+		break;
+
+	    ds_new = ds_new->next;
+	}
+
+	/* clean up all dirs we already left */
+	while ((*stackptr)->next != ds_new)
+	{
+	    ds_ptr = (*stackptr)->next;
+	    (*stackptr)->next = (*stackptr)->next->next;
+	    vim_free(ds_ptr->dirname);
+	    vim_free(ds_ptr);
+	}
+
+	/* Nothing found -> it must be on top level */
+	if (ds_new == NULL)
+	{
+	    vim_free((*stackptr)->dirname);
+	    (*stackptr)->dirname = vim_strsave(dirbuf);
+	}
+    }
+
+    if ((*stackptr)->dirname != NULL)
+	return (*stackptr)->dirname;
+    else
+    {
+	ds_ptr = *stackptr;
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr);
+	return NULL;
+    }
+}
+
+
+/*
+ * pop dirbuf from the directory stack and return previous directory or NULL if
+ * stack is empty
+ */
+    static char_u *
+qf_pop_dir(stackptr)
+    struct dir_stack_T	**stackptr;
+{
+    struct dir_stack_T  *ds_ptr;
+
+    /* TODO: Should we check if dirbuf is the directory on top of the stack?
+     * What to do if it isn't? */
+
+    /* pop top element and free it */
+    if (*stackptr != NULL)
+    {
+	ds_ptr = *stackptr;
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr->dirname);
+	vim_free(ds_ptr);
+    }
+
+    /* return NEW top element as current dir or NULL if stack is empty*/
+    return *stackptr ? (*stackptr)->dirname : NULL;
+}
+
+/*
+ * clean up directory stack
+ */
+    static void
+qf_clean_dir_stack(stackptr)
+    struct dir_stack_T	**stackptr;
+{
+    struct dir_stack_T  *ds_ptr;
+
+    while ((ds_ptr = *stackptr) != NULL)
+    {
+	*stackptr = (*stackptr)->next;
+	vim_free(ds_ptr->dirname);
+	vim_free(ds_ptr);
+    }
+}
+
+/*
+ * Check in which directory of the directory stack the given file can be
+ * found.
+ * Returns a pointer to the directory name or NULL if not found
+ * Cleans up intermediate directory entries.
+ *
+ * TODO: How to solve the following problem?
+ * If we have the this directory tree:
+ *     ./
+ *     ./aa
+ *     ./aa/bb
+ *     ./bb
+ *     ./bb/x.c
+ * and make says:
+ *     making all in aa
+ *     making all in bb
+ *     x.c:9: Error
+ * Then qf_push_dir thinks we are in ./aa/bb, but we are in ./bb.
+ * qf_guess_filepath will return NULL.
+ */
+    static char_u *
+qf_guess_filepath(filename)
+    char_u *filename;
+{
+    struct dir_stack_T     *ds_ptr;
+    struct dir_stack_T     *ds_tmp;
+    char_u		   *fullname;
+
+    /* no dirs on the stack - there's nothing we can do */
+    if (dir_stack == NULL)
+	return NULL;
+
+    ds_ptr = dir_stack->next;
+    fullname = NULL;
+    while (ds_ptr)
+    {
+	vim_free(fullname);
+	fullname = concat_fnames(ds_ptr->dirname, filename, TRUE);
+
+	/* If concat_fnames failed, just go on. The worst thing that can happen
+	 * is that we delete the entire stack.
+	 */
+	if ((fullname != NULL) && (mch_getperm(fullname) >= 0))
+	    break;
+
+	ds_ptr = ds_ptr->next;
+    }
+
+    vim_free(fullname);
+
+    /* clean up all dirs we already left */
+    while (dir_stack->next != ds_ptr)
+    {
+	ds_tmp = dir_stack->next;
+	dir_stack->next = dir_stack->next->next;
+	vim_free(ds_tmp->dirname);
+	vim_free(ds_tmp);
+    }
+
+    return ds_ptr==NULL? NULL: ds_ptr->dirname;
+
+}
+
+/*
+ * jump to a quickfix line
+ * if dir == FORWARD go "errornr" valid entries forward
+ * if dir == BACKWARD go "errornr" valid entries backward
+ * if dir == FORWARD_FILE go "errornr" valid entries files backward
+ * if dir == BACKWARD_FILE go "errornr" valid entries files backward
+ * else if "errornr" is zero, redisplay the same line
+ * else go to entry "errornr"
+ */
+    void
+qf_jump(dir, errornr, forceit)
+    int		dir;
+    int		errornr;
+    int		forceit;
+{
+    struct qf_line	*qf_ptr;
+    struct qf_line	*old_qf_ptr;
+    int			qf_index;
+    int			old_qf_fnum;
+    int			old_qf_index;
+    int			prev_index;
+    static char_u	*e_no_more_items = (char_u *)N_("E553: No more items");
+    char_u		*err = e_no_more_items;
+    linenr_T		i;
+    buf_T		*old_curbuf;
+    linenr_T		old_lnum;
+    char_u		*old_swb = p_swb;
+    colnr_T		screen_col;
+    colnr_T		char_col;
+    char_u		*line;
+#ifdef FEAT_WINDOWS
+    int			opened_window = FALSE;
+    win_T		*win;
+    win_T		*altwin;
+#endif
+    int			print_message = TRUE;
+    int			len;
+#ifdef FEAT_FOLDING
+    int			old_KeyTyped = KeyTyped; /* getting file may reset it */
+#endif
+
+    if (qf_curlist >= qf_listcount || qf_lists[qf_curlist].qf_count == 0)
+    {
+	EMSG(_(e_quickfix));
+	return;
+    }
+
+    qf_ptr = qf_lists[qf_curlist].qf_ptr;
+    old_qf_ptr = qf_ptr;
+    qf_index = qf_lists[qf_curlist].qf_index;
+    old_qf_index = qf_index;
+    if (dir == FORWARD || dir == FORWARD_FILE)	    /* next valid entry */
+    {
+	while (errornr--)
+	{
+	    old_qf_ptr = qf_ptr;
+	    prev_index = qf_index;
+	    old_qf_fnum = qf_ptr->qf_fnum;
+	    do
+	    {
+		if (qf_index == qf_lists[qf_curlist].qf_count
+						   || qf_ptr->qf_next == NULL)
+		{
+		    qf_ptr = old_qf_ptr;
+		    qf_index = prev_index;
+		    if (err != NULL)
+		    {
+			EMSG(_(err));
+			goto theend;
+		    }
+		    errornr = 0;
+		    break;
+		}
+		++qf_index;
+		qf_ptr = qf_ptr->qf_next;
+	    } while ((!qf_lists[qf_curlist].qf_nonevalid && !qf_ptr->qf_valid)
+		  || (dir == FORWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
+	    err = NULL;
+	}
+    }
+    else if (dir == BACKWARD || dir == BACKWARD_FILE)  /* prev. valid entry */
+    {
+	while (errornr--)
+	{
+	    old_qf_ptr = qf_ptr;
+	    prev_index = qf_index;
+	    old_qf_fnum = qf_ptr->qf_fnum;
+	    do
+	    {
+		if (qf_index == 1 || qf_ptr->qf_prev == NULL)
+		{
+		    qf_ptr = old_qf_ptr;
+		    qf_index = prev_index;
+		    if (err != NULL)
+		    {
+			EMSG(_(err));
+			goto theend;
+		    }
+		    errornr = 0;
+		    break;
+		}
+		--qf_index;
+		qf_ptr = qf_ptr->qf_prev;
+	    } while ((!qf_lists[qf_curlist].qf_nonevalid && !qf_ptr->qf_valid)
+		  || (dir == BACKWARD_FILE && qf_ptr->qf_fnum == old_qf_fnum));
+	    err = NULL;
+	}
+    }
+    else if (errornr != 0)	/* go to specified number */
+    {
+	while (errornr < qf_index && qf_index > 1 && qf_ptr->qf_prev != NULL)
+	{
+	    --qf_index;
+	    qf_ptr = qf_ptr->qf_prev;
+	}
+	while (errornr > qf_index && qf_index < qf_lists[qf_curlist].qf_count
+						   && qf_ptr->qf_next != NULL)
+	{
+	    ++qf_index;
+	    qf_ptr = qf_ptr->qf_next;
+	}
+    }
+
+#ifdef FEAT_WINDOWS
+    qf_lists[qf_curlist].qf_index = qf_index;
+    if (qf_win_pos_update(old_qf_index))
+	/* No need to print the error message if it's visible in the error
+	 * window */
+	print_message = FALSE;
+
+    /*
+     * If currently in the quickfix window, find another window to show the
+     * file in.
+     */
+    if (bt_quickfix(curbuf))
+    {
+	/*
+	 * If there is no file specified, we don't know where to go.
+	 * But do advance, otherwise ":cn" gets stuck.
+	 */
+	if (qf_ptr->qf_fnum == 0)
+	    goto theend;
+
+	/*
+	 * If there is only one window, create a new one above the quickfix
+	 * window.
+	 */
+	if (firstwin == lastwin)
+	{
+	    if (win_split(0, WSP_ABOVE) == FAIL)
+		goto failed;		/* not enough room for window */
+	    opened_window = TRUE;	/* close it when fail */
+	    p_swb = empty_option;	/* don't split again */
+# ifdef FEAT_SCROLLBIND
+	    curwin->w_p_scb = FALSE;
+# endif
+	}
+	else
+	{
+	    /*
+	     * Try to find a window that shows the right buffer.
+	     * Default to the window just above the quickfix buffer.
+	     */
+	    win = curwin;
+	    altwin = NULL;
+	    for (;;)
+	    {
+		if (win->w_buffer->b_fnum == qf_ptr->qf_fnum)
+		    break;
+		if (win->w_prev == NULL)
+		    win = lastwin;	/* wrap around the top */
+		else
+		    win = win->w_prev;	/* go to previous window */
+
+		if (bt_quickfix(win->w_buffer))
+		{
+		    /* Didn't find it, go to the window before the quickfix
+		     * window. */
+		    if (altwin != NULL)
+			win = altwin;
+		    else if (curwin->w_prev != NULL)
+			win = curwin->w_prev;
+		    else
+			win = curwin->w_next;
+		    break;
+		}
+
+		/* Remember a usable window. */
+		if (altwin == NULL && !win->w_p_pvw
+					   && win->w_buffer->b_p_bt[0] == NUL)
+		    altwin = win;
+	    }
+
+	    win_goto(win);
+	}
+    }
+#endif
+
+    /*
+     * If there is a file name,
+     * read the wanted file if needed, and check autowrite etc.
+     */
+    old_curbuf = curbuf;
+    old_lnum = curwin->w_cursor.lnum;
+    if (qf_ptr->qf_fnum == 0 || buflist_getfile(qf_ptr->qf_fnum,
+		    (linenr_T)1, GETF_SETMARK | GETF_SWITCH, forceit) == OK)
+    {
+	/* When not switched to another buffer, still need to set pc mark */
+	if (curbuf == old_curbuf)
+	    setpcmark();
+
+	/*
+	 * Go to line with error, unless qf_lnum is 0.
+	 */
+	i = qf_ptr->qf_lnum;
+	if (i > 0)
+	{
+	    if (i > curbuf->b_ml.ml_line_count)
+		i = curbuf->b_ml.ml_line_count;
+	    curwin->w_cursor.lnum = i;
+	}
+	if (qf_ptr->qf_col > 0)
+	{
+	    curwin->w_cursor.col = qf_ptr->qf_col - 1;
+	    if (qf_ptr->qf_virt_col == TRUE)
+	    {
+		/*
+		 * Check each character from the beginning of the error
+		 * line up to the error column.  For each tab character
+		 * found, reduce the error column value by the length of
+		 * a tab character.
+		 */
+		line = ml_get_curline();
+		screen_col = 0;
+		for (char_col = 0; char_col < curwin->w_cursor.col; ++char_col)
+		{
+		    if (*line == NUL)
+			break;
+		    if (*line++ == '\t')
+		    {
+			curwin->w_cursor.col -= 7 - (screen_col % 8);
+			screen_col += 8 - (screen_col % 8);
+		    }
+		    else
+			++screen_col;
+		}
+	    }
+	    check_cursor();
+	}
+	else
+	    beginline(BL_WHITE | BL_FIX);
+
+#ifdef FEAT_FOLDING
+	if ((fdo_flags & FDO_QUICKFIX) && old_KeyTyped)
+	    foldOpenCursor();
+#endif
+	if (print_message)
+	{
+	    /* Update the screen before showing the message */
+	    update_topline_redraw();
+	    sprintf((char *)IObuff, _("(%d of %d)%s%s: "), qf_index,
+		    qf_lists[qf_curlist].qf_count,
+		    qf_ptr->qf_cleared ? _(" (line deleted)") : "",
+		    (char *)qf_types(qf_ptr->qf_type, qf_ptr->qf_nr));
+	    /* Add the message, skipping leading whitespace and newlines. */
+	    len = (int)STRLEN(IObuff);
+	    qf_fmt_text(skipwhite(qf_ptr->qf_text), IObuff + len, IOSIZE - len);
+
+	    /* Output the message.  Overwrite to avoid scrolling when the 'O'
+	     * flag is present in 'shortmess'; But when not jumping, print the
+	     * whole message. */
+	    i = msg_scroll;
+	    if (curbuf == old_curbuf && curwin->w_cursor.lnum == old_lnum)
+		msg_scroll = TRUE;
+	    else if (!msg_scrolled && shortmess(SHM_OVERALL))
+		msg_scroll = FALSE;
+	    msg_attr_keep(IObuff, 0, TRUE);
+	    msg_scroll = i;
+	}
+    }
+    else
+    {
+#ifdef FEAT_WINDOWS
+	if (opened_window)
+	    win_close(curwin, TRUE);    /* Close opened window */
+#endif
+	if (qf_ptr->qf_fnum != 0)
+	{
+	    /*
+	     * Couldn't open file, so put index back where it was.  This could
+	     * happen if the file was readonly and we changed something.
+	     */
+#ifdef FEAT_WINDOWS
+failed:
+#endif
+	    qf_ptr = old_qf_ptr;
+	    qf_index = old_qf_index;
+	}
+    }
+theend:
+    qf_lists[qf_curlist].qf_ptr = qf_ptr;
+    qf_lists[qf_curlist].qf_index = qf_index;
+#ifdef FEAT_WINDOWS
+    if (p_swb != old_swb && opened_window)
+    {
+	/* Restore old 'switchbuf' value, but not when an autocommand or
+	 * modeline has changed the value. */
+	if (p_swb == empty_option)
+	    p_swb = old_swb;
+	else
+	    free_string_option(old_swb);
+    }
+#endif
+}
+
+/*
+ * ":clist": list all errors
+ */
+    void
+qf_list(eap)
+    exarg_T	*eap;
+{
+    buf_T		*buf;
+    char_u		*fname;
+    struct qf_line	*qfp;
+    int			i;
+    int			idx1 = 1;
+    int			idx2 = -1;
+    int			need_return = TRUE;
+    int			last_printed = 1;
+    char_u		*arg = eap->arg;
+    int			all = eap->forceit;	/* if not :cl!, only show
+						   recognised errors */
+
+    if (qf_curlist >= qf_listcount || qf_lists[qf_curlist].qf_count == 0)
+    {
+	EMSG(_(e_quickfix));
+	return;
+    }
+    if (!get_list_range(&arg, &idx1, &idx2) || *arg != NUL)
+    {
+	EMSG(_(e_trailing));
+	return;
+    }
+    i = qf_lists[qf_curlist].qf_count;
+    if (idx1 < 0)
+	idx1 = (-idx1 > i) ? 0 : idx1 + i + 1;
+    if (idx2 < 0)
+	idx2 = (-idx2 > i) ? 0 : idx2 + i + 1;
+
+    more_back_used = TRUE;
+    if (qf_lists[qf_curlist].qf_nonevalid)
+	all = TRUE;
+    qfp = qf_lists[qf_curlist].qf_start;
+    for (i = 1; !got_int && i <= qf_lists[qf_curlist].qf_count; )
+    {
+	if ((qfp->qf_valid || all) && idx1 <= i && i <= idx2)
+	{
+	    if (need_return)
+	    {
+		msg_putchar('\n');
+		need_return = FALSE;
+	    }
+	    if (more_back == 0)
+	    {
+		fname = NULL;
+		if (qfp->qf_fnum != 0
+			      && (buf = buflist_findnr(qfp->qf_fnum)) != NULL)
+		{
+		    fname = buf->b_fname;
+		    if (qfp->qf_type == 1)	/* :helpgrep */
+			fname = gettail(fname);
+		}
+		if (fname == NULL)
+		    sprintf((char *)IObuff, "%2d", i);
+		else
+		    sprintf((char *)IObuff, "%2d %s", i, (char *)fname);
+		msg_outtrans_attr(IObuff, i == qf_lists[qf_curlist].qf_index
+			? hl_attr(HLF_L) : hl_attr(HLF_D));
+		if (qfp->qf_lnum == 0)
+		    IObuff[0] = NUL;
+		else if (qfp->qf_col == 0)
+		    sprintf((char *)IObuff, ":%ld", qfp->qf_lnum);
+		else
+		    sprintf((char *)IObuff, ":%ld col %d",
+						   qfp->qf_lnum, qfp->qf_col);
+		sprintf((char *)IObuff + STRLEN(IObuff), "%s: ",
+				  (char *)qf_types(qfp->qf_type, qfp->qf_nr));
+		msg_puts_attr(IObuff, hl_attr(HLF_N));
+		/* Remove newlines and leading whitespace from the text.
+		 * For an unrecognized line keep the indent, the compiler may
+		 * mark a word with ^^^^. */
+		qf_fmt_text((fname != NULL || qfp->qf_lnum != 0)
+				     ? skipwhite(qfp->qf_text) : qfp->qf_text,
+							      IObuff, IOSIZE);
+		msg_prt_line(IObuff);
+		out_flush();		/* show one line at a time */
+		need_return = TRUE;
+		last_printed = i;
+	    }
+	}
+	if (more_back)
+	{
+	    /* scrolling backwards from the more-prompt */
+	    /* TODO: compute the number of items from the screen lines */
+	    more_back = more_back * 2 - 1;
+	    while (i > last_printed - more_back && i > idx1)
+	    {
+		do
+		{
+		    qfp = qfp->qf_prev;
+		    --i;
+		}
+		while (i > idx1 && !qfp->qf_valid && !all);
+	    }
+	    more_back = 0;
+	}
+	else
+	{
+	    qfp = qfp->qf_next;
+	    ++i;
+	}
+	ui_breakcheck();
+    }
+    more_back_used = FALSE;
+}
+
+/*
+ * Remove newlines and leading whitespace from an error message.
+ * Put the result in "buf[bufsize]".
+ */
+    static void
+qf_fmt_text(text, buf, bufsize)
+    char_u	*text;
+    char_u	*buf;
+    int		bufsize;
+{
+    int		i;
+    char_u	*p = text;
+
+    for (i = 0; *p != NUL && i < bufsize - 1; ++i)
+    {
+	if (*p == '\n')
+	{
+	    buf[i] = ' ';
+	    while (*++p != NUL)
+		if (!vim_iswhite(*p) && *p != '\n')
+		    break;
+	}
+	else
+	    buf[i] = *p++;
+    }
+    buf[i] = NUL;
+}
+
+/*
+ * ":colder [count]": Up in the quickfix stack.
+ * ":cnewer [count]": Down in the quickfix stack.
+ */
+    void
+qf_age(eap)
+    exarg_T	*eap;
+{
+    int		count;
+
+    if (eap->addr_count != 0)
+	count = eap->line2;
+    else
+	count = 1;
+    while (count--)
+    {
+	if (eap->cmdidx == CMD_colder)
+	{
+	    if (qf_curlist == 0)
+	    {
+		EMSG(_("E380: At bottom of quickfix stack"));
+		return;
+	    }
+	    --qf_curlist;
+	}
+	else
+	{
+	    if (qf_curlist >= qf_listcount - 1)
+	    {
+		EMSG(_("E381: At top of quickfix stack"));
+		return;
+	    }
+	    ++qf_curlist;
+	}
+    }
+    qf_msg();
+}
+
+    static void
+qf_msg()
+{
+    smsg((char_u *)_("error list %d of %d; %d errors"),
+	    qf_curlist + 1, qf_listcount, qf_lists[qf_curlist].qf_count);
+#ifdef FEAT_WINDOWS
+    qf_update_buffer();
+#endif
+}
+
+/*
+ * free the error list
+ */
+    static void
+qf_free(idx)
+    int		idx;
+{
+    struct qf_line *qfp;
+
+    while (qf_lists[idx].qf_count)
+    {
+	qfp = qf_lists[idx].qf_start->qf_next;
+	vim_free(qf_lists[idx].qf_start->qf_text);
+	vim_free(qf_lists[idx].qf_start);
+	qf_lists[idx].qf_start = qfp;
+	--qf_lists[idx].qf_count;
+    }
+}
+
+/*
+ * qf_mark_adjust: adjust marks
+ */
+   void
+qf_mark_adjust(line1, line2, amount, amount_after)
+    linenr_T	line1;
+    linenr_T	line2;
+    long	amount;
+    long	amount_after;
+{
+    int			i;
+    struct qf_line	*qfp;
+    int			idx;
+
+    for (idx = 0; idx < qf_listcount; ++idx)
+	if (qf_lists[idx].qf_count)
+	    for (i = 0, qfp = qf_lists[idx].qf_start;
+		       i < qf_lists[idx].qf_count; ++i, qfp = qfp->qf_next)
+		if (qfp->qf_fnum == curbuf->b_fnum)
+		{
+		    if (qfp->qf_lnum >= line1 && qfp->qf_lnum <= line2)
+		    {
+			if (amount == MAXLNUM)
+			    qfp->qf_cleared = TRUE;
+			else
+			    qfp->qf_lnum += amount;
+		    }
+		    else if (amount_after && qfp->qf_lnum > line2)
+			qfp->qf_lnum += amount_after;
+		}
+}
+
+/*
+ * Make a nice message out of the error character and the error number:
+ *  char    number	message
+ *  e or E    0		" error"
+ *  w or W    0		" warning"
+ *  i or I    0		" info"
+ *  0	      0		""
+ *  other     0		" c"
+ *  e or E    n		" error n"
+ *  w or W    n		" warning n"
+ *  i or I    n		" info n"
+ *  0	      n		" error n"
+ *  other     n		" c n"
+ *  1	      x		""	:helpgrep
+ */
+    static char_u *
+qf_types(c, nr)
+    int c, nr;
+{
+    static char_u	buf[20];
+    static char_u	cc[3];
+    char_u		*p;
+
+    if (c == 'W' || c == 'w')
+	p = (char_u *)" warning";
+    else if (c == 'I' || c == 'i')
+	p = (char_u *)" info";
+    else if (c == 'E' || c == 'e' || (c == 0 && nr > 0))
+	p = (char_u *)" error";
+    else if (c == 0 || c == 1)
+	p = (char_u *)"";
+    else
+    {
+	cc[0] = ' ';
+	cc[1] = c;
+	cc[2] = NUL;
+	p = cc;
+    }
+
+    if (nr <= 0)
+	return p;
+
+    sprintf((char *)buf, "%s %3d", (char *)p, nr);
+    return buf;
+}
+
+#if defined(FEAT_WINDOWS) || defined(PROTO)
+/*
+ * ":cwindow": open the quickfix window if we have errors to display,
+ *	       close it if not.
+ */
+    void
+ex_cwindow(eap)
+    exarg_T	*eap;
+{
+    win_T	*win;
+
+    /*
+     * Look for an existing quickfix window.
+     */
+    for (win = firstwin; win != NULL; win = win->w_next)
+	if (bt_quickfix(win->w_buffer))
+	    break;
+
+    /*
+     * If a quickfix window is open but we have no errors to display,
+     * close the window.  If a quickfix window is not open, then open
+     * it if we have errors; otherwise, leave it closed.
+     */
+    if (qf_lists[qf_curlist].qf_nonevalid || qf_curlist >= qf_listcount)
+    {
+	if (win != NULL)
+	    ex_cclose(eap);
+    }
+    else if (win == NULL)
+	ex_copen(eap);
+}
+
+/*
+ * ":cclose": close the window showing the list of errors.
+ */
+/*ARGSUSED*/
+    void
+ex_cclose(eap)
+    exarg_T	*eap;
+{
+    win_T	*win;
+
+    /*
+     * Find existing quickfix window and close it.
+     */
+    for (win = firstwin; win != NULL; win = win->w_next)
+	if (bt_quickfix(win->w_buffer))
+	    break;
+
+    if (win != NULL)
+	win_close(win, FALSE);
+}
+
+/*
+ * ":copen": open a window that shows the list of errors.
+ */
+    void
+ex_copen(eap)
+    exarg_T	*eap;
+{
+    int		height;
+    buf_T	*buf;
+    win_T	*win;
+
+    if (eap->addr_count != 0)
+	height = eap->line2;
+    else
+	height = QF_WINHEIGHT;
+
+#ifdef FEAT_VISUAL
+    reset_VIsual_and_resel();			/* stop Visual mode */
+#endif
+#ifdef FEAT_GUI
+    need_mouse_correct = TRUE;
+#endif
+
+    /*
+     * Find existing quickfix window, or open a new one.
+     */
+    for (win = firstwin; win != NULL; win = win->w_next)
+	if (bt_quickfix(win->w_buffer))
+	    break;
+    if (win != NULL)
+	win_goto(win);
+    else
+    {
+	/* The current window becomes the previous window afterwards. */
+	win = curwin;
+
+	/* Create the new window at the very bottom. */
+	win_goto(lastwin);
+	if (win_split(height, WSP_BELOW) == FAIL)
+	    return;		/* not enough room for window */
+#ifdef FEAT_SCROLLBIND
+	curwin->w_p_scb = FALSE;
+#endif
+
+	/*
+	 * Find existing quickfix buffer, or create a new one.
+	 */
+	buf = qf_find_buf();
+	if (buf == NULL)
+	{
+	    (void)do_ecmd(0, NULL, NULL, NULL, ECMD_ONE, ECMD_HIDE);
+	    /* switch off 'swapfile' */
+	    set_option_value((char_u *)"swf", 0L, NULL, OPT_LOCAL);
+	    set_option_value((char_u *)"bt", 0L, (char_u *)"quickfix",
+								   OPT_LOCAL);
+	    set_option_value((char_u *)"bh", 0L, (char_u *)"delete", OPT_LOCAL);
+	    set_option_value((char_u *)"diff", 0L, (char_u *)"", OPT_LOCAL);
+	}
+	else if (buf != curbuf)
+	    set_curbuf(buf, DOBUF_GOTO);
+
+	/* Only set the height when there is no window to the side. */
+	if (curwin->w_width == Columns)
+	    win_setheight(height);
+	curwin->w_p_wfh = TRUE;	    /* set 'winfixheight' */
+	if (win_valid(win))
+	    prevwin = win;
+    }
+
+    /*
+     * Fill the buffer with the quickfix list.
+     */
+    qf_fill_buffer();
+
+    curwin->w_cursor.lnum = qf_lists[qf_curlist].qf_index;
+    curwin->w_cursor.col = 0;
+    check_cursor();
+    update_topline();		/* scroll to show the line */
+}
+
+/*
+ * Return the number of the current entry (line number in the quickfix
+ * window).
+ */
+     linenr_T
+qf_current_entry()
+{
+    return qf_lists[qf_curlist].qf_index;
+}
+
+/*
+ * Update the cursor position in the quickfix window to the current error.
+ * Return TRUE if there is a quickfix window.
+ */
+    static int
+qf_win_pos_update(old_qf_index)
+    int		old_qf_index;	/* previous qf_index or zero */
+{
+    win_T	*win;
+    int		qf_index = qf_lists[qf_curlist].qf_index;
+
+    /*
+     * Put the cursor on the current error in the quickfix window, so that
+     * it's viewable.
+     */
+    for (win = firstwin; win != NULL; win = win->w_next)
+	if (bt_quickfix(win->w_buffer))
+	    break;
+    if (win != NULL
+	    && qf_index <= win->w_buffer->b_ml.ml_line_count
+	    && old_qf_index != qf_index)
+    {
+	win_T	*old_curwin = curwin;
+
+	curwin = win;
+	curbuf = win->w_buffer;
+	if (qf_index > old_qf_index)
+	{
+	    curwin->w_redraw_top = old_qf_index;
+	    curwin->w_redraw_bot = qf_index;
+	}
+	else
+	{
+	    curwin->w_redraw_top = qf_index;
+	    curwin->w_redraw_bot = old_qf_index;
+	}
+	curwin->w_cursor.lnum = qf_index;
+	curwin->w_cursor.col = 0;
+	update_topline();		/* scroll to show the line */
+	redraw_later(VALID);
+	curwin->w_redr_status = TRUE;	/* update ruler */
+	curwin = old_curwin;
+	curbuf = curwin->w_buffer;
+    }
+    return win != NULL;
+}
+
+/*
+ * Find quickfix buffer.
+ */
+    static buf_T *
+qf_find_buf()
+{
+    buf_T	*buf;
+
+    for (buf = firstbuf; buf != NULL; buf = buf->b_next)
+	if (bt_quickfix(buf))
+	    break;
+    return buf;
+}
+
+/*
+ * Find the quickfix buffer.  If it exists, update the contents.
+ */
+    static void
+qf_update_buffer()
+{
+    buf_T	*buf;
+#ifdef FEAT_AUTOCMD
+    aco_save_T	aco;
+#else
+    buf_T	*save_curbuf;
+#endif
+
+    /* Check if a buffer for the quickfix list exists.  Update it. */
+    buf = qf_find_buf();
+    if (buf != NULL)
+    {
+#ifdef FEAT_AUTOCMD
+	/* set curwin/curbuf to buf and save a few things */
+	aucmd_prepbuf(&aco, buf);
+#else
+	save_curbuf = curbuf;
+	curbuf = buf;
+#endif
+
+	qf_fill_buffer();
+
+#ifdef FEAT_AUTOCMD
+	/* restore curwin/curbuf and a few other things */
+	aucmd_restbuf(&aco);
+#else
+	curbuf = save_curbuf;
+#endif
+
+	(void)qf_win_pos_update(0);
+    }
+}
+
+/*
+ * Fill current buffer with quickfix errors, replacing any previous contents.
+ * curbuf must be the quickfix buffer!
+ */
+    static void
+qf_fill_buffer()
+{
+    linenr_T		lnum;
+    struct qf_line	*qfp;
+    buf_T		*errbuf;
+    int			len;
+    int			old_KeyTyped = KeyTyped;
+
+    /* delete all existing lines */
+    while ((curbuf->b_ml.ml_flags & ML_EMPTY) == 0)
+	(void)ml_delete((linenr_T)1, FALSE);
+
+    /* Check if there is anything to display */
+    if (qf_curlist < qf_listcount)
+    {
+	/* Add one line for each error */
+	qfp = qf_lists[qf_curlist].qf_start;
+	for (lnum = 0; lnum < qf_lists[qf_curlist].qf_count; ++lnum)
+	{
+	    if (qfp->qf_fnum != 0
+		    && (errbuf = buflist_findnr(qfp->qf_fnum)) != NULL
+		    && errbuf->b_fname != NULL)
+	    {
+		if (qfp->qf_type == 1)	/* :helpgrep */
+		    STRCPY(IObuff, gettail(errbuf->b_fname));
+		else
+		    STRCPY(IObuff, errbuf->b_fname);
+		len = (int)STRLEN(IObuff);
+	    }
+	    else
+		len = 0;
+	    IObuff[len++] = '|';
+
+	    if (qfp->qf_lnum > 0)
+	    {
+		sprintf((char *)IObuff + len, "%ld", qfp->qf_lnum);
+		len += (int)STRLEN(IObuff + len);
+
+		if (qfp->qf_col > 0)
+		{
+		    sprintf((char *)IObuff + len, " col %d", qfp->qf_col);
+		    len += (int)STRLEN(IObuff + len);
+		}
+
+		sprintf((char *)IObuff + len, "%s",
+				  (char *)qf_types(qfp->qf_type, qfp->qf_nr));
+		len += (int)STRLEN(IObuff + len);
+	    }
+	    IObuff[len++] = '|';
+	    IObuff[len++] = ' ';
+
+	    /* Remove newlines and leading whitespace from the text.
+	     * For an unrecognized line keep the indent, the compiler may
+	     * mark a word with ^^^^. */
+	    qf_fmt_text(len > 3 ? skipwhite(qfp->qf_text) : qfp->qf_text,
+						  IObuff + len, IOSIZE - len);
+
+	    if (ml_append(lnum, IObuff, (colnr_T)STRLEN(IObuff) + 1, FALSE)
+								      == FAIL)
+		break;
+	    qfp = qfp->qf_next;
+	}
+	/* Delete the empty line which is now at the end */
+	(void)ml_delete(lnum + 1, FALSE);
+    }
+
+    /* correct cursor position */
+    check_lnums(TRUE);
+
+    /* Set the 'filetype' to "qf" each time after filling the buffer.  This
+     * resembles reading a file into a buffer, it's more logical when using
+     * autocommands. */
+    set_option_value((char_u *)"ft", 0L, (char_u *)"qf", OPT_LOCAL);
+    curbuf->b_p_ma = FALSE;
+
+#ifdef FEAT_AUTOCMD
+    apply_autocmds(EVENT_BUFREADPOST, (char_u *)"quickfix", NULL,
+							       FALSE, curbuf);
+    apply_autocmds(EVENT_BUFWINENTER, (char_u *)"quickfix", NULL,
+							       FALSE, curbuf);
+#endif
+
+    /* make sure it will be redrawn */
+    redraw_curbuf_later(NOT_VALID);
+
+    /* Restore KeyTyped, setting 'filetype' may reset it. */
+    KeyTyped = old_KeyTyped;
+}
+
+#endif /* FEAT_WINDOWS */
+
+/*
+ * Return TRUE if "buf" is the quickfix buffer.
+ */
+    int
+bt_quickfix(buf)
+    buf_T	*buf;
+{
+    return (buf->b_p_bt[0] == 'q');
+}
+
+/*
+ * Return TRUE if "buf" is a "nofile" buffer.
+ */
+    int
+bt_nofile(buf)
+    buf_T	*buf;
+{
+    return (buf->b_p_bt[0] == 'n' && buf->b_p_bt[2] == 'f');
+}
+
+/*
+ * Return TRUE if "buf" is a "nowrite" or "nofile" buffer.
+ */
+    int
+bt_dontwrite(buf)
+    buf_T	*buf;
+{
+    return (buf->b_p_bt[0] == 'n');
+}
+
+    int
+bt_dontwrite_msg(buf)
+    buf_T	*buf;
+{
+    if (bt_dontwrite(buf))
+    {
+	EMSG(_("E382: Cannot write, 'buftype' option is set"));
+	return TRUE;
+    }
+    return FALSE;
+}
+
+/*
+ * Return TRUE if the buffer should be hidden, according to 'hidden', ":hide"
+ * and 'bufhidden'.
+ */
+    int
+buf_hide(buf)
+    buf_T	*buf;
+{
+    /* 'bufhidden' overrules 'hidden' and ":hide", check it first */
+    switch (buf->b_p_bh[0])
+    {
+	case 'u':		    /* "unload" */
+	case 'w':		    /* "wipe" */
+	case 'd': return FALSE;	    /* "delete" */
+	case 'h': return TRUE;	    /* "hide" */
+    }
+    return (p_hid || cmdmod.hide);
+}
+
+/*
+ * Used for ":make", ":grep" and ":grepadd".
+ */
+    void
+ex_make(eap)
+    exarg_T	*eap;
+{
+    char_u	*name;
+    char_u	*cmd;
+    unsigned	len;
+
+    autowrite_all();
+    name = get_mef_name();
+    if (name == NULL)
+	return;
+    mch_remove(name);	    /* in case it's not unique */
+
+    /*
+     * If 'shellpipe' empty: don't redirect to 'errorfile'.
+     */
+    len = (unsigned)STRLEN(p_shq) * 2 + (unsigned)STRLEN(eap->arg) + 1;
+    if (*p_sp != NUL)
+	len += (unsigned)STRLEN(p_sp) + (unsigned)STRLEN(name) + 3;
+    cmd = alloc(len);
+    if (cmd == NULL)
+	return;
+    sprintf((char *)cmd, "%s%s%s", (char *)p_shq, (char *)eap->arg,
+							       (char *)p_shq);
+    if (*p_sp != NUL)
+	append_redir(cmd, p_sp, name);
+    /*
+     * Output a newline if there's something else than the :make command that
+     * was typed (in which case the cursor is in column 0).
+     */
+    if (msg_col == 0)
+	msg_didout = FALSE;
+    msg_start();
+    MSG_PUTS(":!");
+    msg_outtrans(cmd);		/* show what we are doing */
+
+    /* let the shell know if we are redirecting output or not */
+    do_shell(cmd, *p_sp != NUL ? SHELL_DOOUT : 0);
+
+#ifdef AMIGA
+    out_flush();
+		/* read window status report and redraw before message */
+    (void)char_avail();
+#endif
+
+    if (qf_init(name, eap->cmdidx != CMD_make ? p_gefm : p_efm,
+					      eap->cmdidx != CMD_grepadd) > 0
+	    && !eap->forceit)
+	qf_jump(0, 0, FALSE);		/* display first error */
+
+    mch_remove(name);
+    vim_free(name);
+    vim_free(cmd);
+}
+
+/*
+ * Return the name for the errorfile, in allocated memory.
+ * Find a new unique name when 'makeef' contains "##".
+ * Returns NULL for error.
+ */
+    static char_u *
+get_mef_name()
+{
+    char_u	*p;
+    char_u	*name;
+    static int	start = -1;
+    static int	off = 0;
+#ifdef HAVE_LSTAT
+    struct stat	sb;
+#endif
+
+    if (*p_mef == NUL)
+    {
+	name = vim_tempname('e');
+	if (name == NULL)
+	    EMSG(_(e_notmp));
+	return name;
+    }
+
+    for (p = p_mef; *p; ++p)
+	if (p[0] == '#' && p[1] == '#')
+	    break;
+
+    if (*p == NUL)
+	return vim_strsave(p_mef);
+
+    /* Keep trying until the name doesn't exist yet. */
+    for (;;)
+    {
+	if (start == -1)
+	    start = mch_get_pid();
+	else
+	    off += 19;
+
+	name = alloc((unsigned)STRLEN(p_mef) + 30);
+	if (name == NULL)
+	    break;
+	STRCPY(name, p_mef);
+	sprintf((char *)name + (p - p_mef), "%d%d", start, off);
+	STRCAT(name, p + 2);
+	if (mch_getperm(name) < 0
+#ifdef HAVE_LSTAT
+		    /* Don't accept a symbolic link, its a security risk. */
+		    && mch_lstat((char *)name, &sb) < 0
+#endif
+		)
+	    break;
+	vim_free(name);
+    }
+    return name;
+}
+
+/*
+ * ":cc", ":crewind", ":cfirst" and ":clast".
+ */
+    void
+ex_cc(eap)
+    exarg_T	*eap;
+{
+    qf_jump(0,
+	    eap->addr_count > 0
+	    ? (int)eap->line2
+	    : eap->cmdidx == CMD_cc
+		? 0
+		: (eap->cmdidx == CMD_crewind || eap->cmdidx == CMD_cfirst)
+		    ? 1
+		    : 32767,
+	    eap->forceit);
+}
+
+/*
+ * ":cnext", ":cnfile", ":cNext" and ":cprevious".
+ */
+    void
+ex_cnext(eap)
+    exarg_T	*eap;
+{
+    qf_jump(eap->cmdidx == CMD_cnext
+	    ? FORWARD
+	    : eap->cmdidx == CMD_cnfile
+		? FORWARD_FILE
+		: (eap->cmdidx == CMD_cpfile || eap->cmdidx == CMD_cNfile)
+		    ? BACKWARD_FILE
+		    : BACKWARD,
+	    eap->addr_count > 0 ? (int)eap->line2 : 1, eap->forceit);
+}
+
+/*
+ * ":cfile" command.
+ */
+    void
+ex_cfile(eap)
+    exarg_T	*eap;
+{
+    if (*eap->arg != NUL)
+	set_string_option_direct((char_u *)"ef", -1, eap->arg, OPT_FREE);
+    if (qf_init(p_ef, p_efm, TRUE) > 0 && eap->cmdidx == CMD_cfile)
+	qf_jump(0, 0, eap->forceit);		/* display first error */
+}
+
+/*
+ * ":helpgrep {pattern}"
+ */
+    void
+ex_helpgrep(eap)
+    exarg_T	*eap;
+{
+    regmatch_T	regmatch;
+    char_u	*save_cpo;
+    char_u	*p;
+    int		fcount;
+    char_u	**fnames;
+    FILE	*fd;
+    int		fi;
+    struct qf_line *prevp = NULL;
+    long	lnum;
+
+    /* Make 'cpoptions' empty, the 'l' flag should not be used here. */
+    save_cpo = p_cpo;
+    p_cpo = (char_u *)"";
+
+    regmatch.regprog = vim_regcomp(eap->arg, RE_MAGIC + RE_STRING);
+    regmatch.rm_ic = FALSE;
+    if (regmatch.regprog != NULL)
+    {
+	/* create a new quickfix list */
+	qf_new_list();
+
+	/* Go through all directories in 'runtimepath' */
+	p = p_rtp;
+	while (*p != NUL && !got_int)
+	{
+	    copy_option_part(&p, NameBuff, MAXPATHL, ",");
+
+	    /* Find all "*.txt" and "*.??x" files in the "doc" directory. */
+	    add_pathsep(NameBuff);
+	    STRCAT(NameBuff, "doc/*.\\(txt\\|??x\\)");
+	    if (gen_expand_wildcards(1, &NameBuff, &fcount,
+					     &fnames, EW_FILE|EW_SILENT) == OK
+		    && fcount > 0)
+	    {
+		for (fi = 0; fi < fcount && !got_int; ++fi)
+		{
+		    fd = fopen((char *)fnames[fi], "r");
+		    if (fd != NULL)
+		    {
+			lnum = 1;
+			while (!vim_fgets(IObuff, IOSIZE, fd) && !got_int)
+			{
+			    if (vim_regexec(&regmatch, IObuff, (colnr_T)0))
+			    {
+				int	l = STRLEN(IObuff);
+
+				/* remove trailing CR, LF, spaces, etc. */
+				while (l > 0 && IObuff[l - 1] <= ' ')
+				     IObuff[--l] = NUL;
+
+				if (qf_add_entry(&prevp,
+					    NULL,	/* dir */
+					    fnames[fi],
+					    IObuff,
+					    lnum,
+					    0,		/* col */
+					    FALSE,	/* virt_col */
+					    0,		/* nr */
+					    1,		/* type */
+					    TRUE	/* valid */
+					    ) == FAIL)
+				{
+				    got_int = TRUE;
+				    break;
+				}
+			    }
+			    ++lnum;
+			    line_breakcheck();
+			}
+			fclose(fd);
+		    }
+		}
+		FreeWild(fcount, fnames);
+	    }
+	}
+	vim_free(regmatch.regprog);
+
+	qf_lists[qf_curlist].qf_nonevalid = FALSE;
+	qf_lists[qf_curlist].qf_ptr = qf_lists[qf_curlist].qf_start;
+	qf_lists[qf_curlist].qf_index = 1;
+    }
+
+    p_cpo = save_cpo;
+
+#ifdef FEAT_WINDOWS
+    qf_update_buffer();
+#endif
+
+    /* Jump to first match. */
+    if (qf_lists[qf_curlist].qf_count > 0)
+	qf_jump(0, 0, FALSE);
+}
+
+#endif /* FEAT_QUICKFIX */