vim: src/fileio.c comparison

comparison src/fileio.c @ 18199:e2be5a6485f5 v8.1.2094

patch 8.1.2094: the fileio.c file is too big Commit: https://github.com/vim/vim/commit/473952e85286eb9c6098801f1819981ba61ad153 Author: Bram Moolenaar <Bram@vim.org> Date: Sat Sep 28 16:30:04 2019 +0200 patch 8.1.2094: the fileio.c file is too big Problem: The fileio.c file is too big. Solution: Move buf_write() to bufwrite.c. (Yegappan Lakshmanan, closes #4990)

author	Bram Moolenaar <Bram@vim.org>
date	Sat, 28 Sep 2019 16:45:04 +0200
parents	59bc3cd42cf5
children	788d76db02ac

comparison

equal deleted inserted replaced

-:3ebea66ebaff
+:e2be5a6485f5
 #if defined(__TANDEM) || defined(__MINT__)
 # include <limits.h>		/* for SSIZE_MAX */
 #endif
-#if defined(HAVE_UTIME) && defined(HAVE_UTIME_H)
-# include <utime.h>		/* for struct utimbuf */
-#endif
-#define BUFSIZE		8192	/* size of normal write buffer */
-#define SMBUFSIZE	256	/* size of emergency write buffer */
 /* Is there any system that doesn't have access()? */
 #define USE_MCH_ACCESS
 static char_u *next_fenc(char_u **pp, int *alloced);
 #ifdef FEAT_EVAL
 static char_u *readfile_charconvert(char_u *fname, char_u *fenc, int *fdp);
 #endif
 #ifdef FEAT_CRYPT
 static char_u *check_for_cryptkey(char_u *cryptkey, char_u *ptr, long *sizep, off_T *filesizep, int newfile, char_u *fname, int *did_ask);
 #endif
-static int set_rw_fname(char_u *fname, char_u *sfname);
-static int msg_add_fileformat(int eol_type);
-static void msg_add_eol(void);
-static int check_mtime(buf_T *buf, stat_T *s);
-static int time_differs(long t1, long t2);
-#define HAS_BW_FLAGS
-#define FIO_LATIN1	0x01	/* convert Latin1 */
-#define FIO_UTF8	0x02	/* convert UTF-8 */
-#define FIO_UCS2	0x04	/* convert UCS-2 */
-#define FIO_UCS4	0x08	/* convert UCS-4 */
-#define FIO_UTF16	0x10	/* convert UTF-16 */
-#ifdef MSWIN
-# define FIO_CODEPAGE	0x20	/* convert MS-Windows codepage */
-# define FIO_PUT_CP(x) (((x) & 0xffff) << 16)	/* put codepage in top word */
-# define FIO_GET_CP(x)	(((x)>>16) & 0xffff)	/* get codepage from top word */
-#endif
-#ifdef MACOS_CONVERT
-# define FIO_MACROMAN	0x20	/* convert MacRoman */
-#endif
-#define FIO_ENDIAN_L	0x80	/* little endian */
-#define FIO_ENCRYPTED	0x1000	/* encrypt written bytes */
-#define FIO_NOCONVERT	0x2000	/* skip encoding conversion */
-#define FIO_UCSBOM	0x4000	/* check for BOM at start of file */
-#define FIO_ALL	-1	/* allow all formats */
-/* When converting, a read() or write() may leave some bytes to be converted
-* for the next call.  The value is guessed... */
-#define CONV_RESTLEN 30
-/* We have to guess how much a sequence of bytes may expand when converting
-* with iconv() to be able to allocate a buffer. */
-#define ICONV_MULT 8
-/*
-* Structure to pass arguments from buf_write() to buf_write_bytes().
-*/
-struct bw_info
-{
-int		bw_fd;		/* file descriptor */
-char_u	*bw_buf;	/* buffer with data to be written */
-int		bw_len;		/* length of data */
-#ifdef HAS_BW_FLAGS
-int		bw_flags;	/* FIO_ flags */
-#endif
-#ifdef FEAT_CRYPT
-buf_T	*bw_buffer;	/* buffer being written */
-#endif
-char_u	bw_rest[CONV_RESTLEN]; /* not converted bytes */
-int		bw_restlen;	/* nr of bytes in bw_rest[] */
-int		bw_first;	/* first write call */
-char_u	*bw_conv_buf;	/* buffer for writing converted chars */
-size_t	bw_conv_buflen; /* size of bw_conv_buf */
-int		bw_conv_error;	/* set for conversion error */
-linenr_T	bw_conv_error_lnum;  /* first line with error or zero */
-linenr_T	bw_start_lnum;  /* line number at start of buffer */
-#ifdef USE_ICONV
-iconv_t	bw_iconv_fd;	/* descriptor for iconv() or -1 */
-#endif
-};
-static int  buf_write_bytes(struct bw_info *ip);
 static linenr_T readfile_linenr(linenr_T linecnt, char_u *p, char_u *endp);
-static int ucs2bytes(unsigned c, char_u **pp, int flags);
-static int need_conversion(char_u *fenc);
-static int get_fio_flags(char_u *ptr);
 static char_u *check_for_bom(char_u *p, long size, int *lenp, int flags);
-static int make_bom(char_u *buf, char_u *name);
-#ifdef MSWIN
-static int get_win_fio_flags(char_u *ptr);
-#endif
-#ifdef MACOS_CONVERT
-static int get_mac_fio_flags(char_u *ptr);
-#endif
 static char *e_auchangedbuf = N_("E812: Autocommands changed buffer or buffer name");
-static void
+void
 filemess(
 buf_T	*buf,
 char_u	*name,
 char_u	*s,
 int		attr)
 {
 int		msg_scroll_save;
+int		prev_msg_col = msg_col;
 if (msg_silent != 0)
 	return;
 msg_add_fname(buf, name);	    /* put file name in IObuff with quotes */
 /* If it's extremely long, truncate it. */
 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();
+if (prev_msg_col != 0 && msg_col == 0)
+	msg_putchar('\r');  // overwrite any previous message.
 msg_scroll = msg_scroll_save;
 msg_scrolled_ign = TRUE;
 /* may truncate the message to avoid a hit-return prompt */
 msg_outtrans_attr(msg_may_trunc(FALSE, IObuff), attr);
 msg_clr_eos();
 	     * message box (which might be shown when exiting!) */
 	    if (read_stdin || read_buffer)
 		p = msg_may_trunc(FALSE, IObuff);
 	    else
 #endif
+	    {
+		if (msg_col > 0)
+		    msg_putchar('\r');  // overwrite previous message
 		p = (char_u *)msg_trunc_attr((char *)IObuff, FALSE, 0);
+	    }
 	    if (read_stdin || read_buffer || restart_edit != 0
 		    || (msg_scrolled != 0 && !need_wait_return))
 		/* Need to repeat the message after redrawing when:
 		 * - When reading from stdin (the screen will be cleared next).
 		 * - When restart_edit is set (otherwise there will be a delay
 return cryptkey;
 }
 #endif  /* FEAT_CRYPT */
-#ifdef UNIX
-static void
-set_file_time(
-char_u  *fname,
-time_t  atime,	    /* access time */
-time_t  mtime)	    /* modification time */
-{
-# if defined(HAVE_UTIME) && defined(HAVE_UTIME_H)
-struct utimbuf  buf;
-buf.actime	= atime;
-buf.modtime	= mtime;
-(void)utime((char *)fname, &buf);
-# else
-#  if defined(HAVE_UTIMES)
-struct timeval  tvp[2];
-tvp[0].tv_sec   = atime;
-tvp[0].tv_usec  = 0;
-tvp[1].tv_sec   = mtime;
-tvp[1].tv_usec  = 0;
-#   ifdef NeXT
-(void)utimes((char *)fname, tvp);
-#   else
-(void)utimes((char *)fname, (const struct timeval *)&tvp);
-#   endif
-#  endif
-# endif
-}
-#endif /* UNIX */
 #if defined(VMS) && !defined(MIN)
 /* Older DECC compiler for VAX doesn't define MIN() */
 # define MIN(a, b) ((a) < (b) ? (a) : (b))
 #endif
 					? TRUE : (close(fd), FALSE)
 #endif
 	);
 }
-/*
-* buf_write() - write to file "fname" lines "start" through "end"
-*
-* We do our own buffering here because fwrite() is so slow.
-*
-* If "forceit" is true, we don't care for errors when attempting backups.
-* In case of an error everything possible is done to restore the original
-* file.  But when "forceit" is TRUE, we risk losing it.
-*
-* When "reset_changed" is TRUE and "append" == FALSE and "start" == 1 and
-* "end" == curbuf->b_ml.ml_line_count, reset curbuf->b_changed.
-*
-* This function must NOT use NameBuff (because it's called by autowrite()).
-*
-* return FAIL for failure, OK otherwise
-*/
-int
-buf_write(
-buf_T	    *buf,
-char_u	    *fname,
-char_u	    *sfname,
-linenr_T	    start,
-linenr_T	    end,
-exarg_T	    *eap,		/* for forced 'ff' and 'fenc', can be
-					   NULL! */
-int		    append,		/* append to the file */
-int		    forceit,
-int		    reset_changed,
-int		    filtering)
-{
-int		    fd;
-char_u	    *backup = NULL;
-int		    backup_copy = FALSE; /* copy the original file? */
-int		    dobackup;
-char_u	    *ffname;
-char_u	    *wfname = NULL;	/* name of file to write to */
-char_u	    *s;
-char_u	    *ptr;
-char_u	    c;
-int		    len;
-linenr_T	    lnum;
-long	    nchars;
-char_u	    *errmsg = NULL;
-int		    errmsg_allocated = FALSE;
-char_u	    *errnum = NULL;
-char_u	    *buffer;
-char_u	    smallbuf[SMBUFSIZE];
-char_u	    *backup_ext;
-int		    bufsize;
-long	    perm;		    /* file permissions */
-int		    retval = OK;
-int		    newfile = FALSE;	    /* TRUE if file doesn't exist yet */
-int		    msg_save = msg_scroll;
-int		    overwriting;	    /* TRUE if writing over original */
-int		    no_eol = FALSE;	    /* no end-of-line written */
-int		    device = FALSE;	    /* writing to a device */
-stat_T	    st_old;
-int		    prev_got_int = got_int;
-int		    checking_conversion;
-int		    file_readonly = FALSE;  /* overwritten file is read-only */
-static char	    *err_readonly = "is read-only (cannot override: \"W\" in 'cpoptions')";
-#if defined(UNIX)			    /*XXX fix me sometime? */
-int		    made_writable = FALSE;  /* 'w' bit has been set */
-#endif
-					/* writing everything */
-int		    whole = (start == 1 && end == buf->b_ml.ml_line_count);
-linenr_T	    old_line_count = buf->b_ml.ml_line_count;
-int		    attr;
-int		    fileformat;
-int		    write_bin;
-struct bw_info  write_info;		/* info for buf_write_bytes() */
-int		    converted = FALSE;
-int		    notconverted = FALSE;
-char_u	    *fenc;		/* effective 'fileencoding' */
-char_u	    *fenc_tofree = NULL; /* allocated "fenc" */
-#ifdef HAS_BW_FLAGS
-int		    wb_flags = 0;
-#endif
-#ifdef HAVE_ACL
-vim_acl_T	    acl = NULL;		/* ACL copied from original file to
-					   backup or new file */
-#endif
-#ifdef FEAT_PERSISTENT_UNDO
-int		    write_undo_file = FALSE;
-context_sha256_T sha_ctx;
-#endif
-unsigned int    bkc = get_bkc_value(buf);
-if (fname == NULL || *fname == NUL)	/* safety check */
-	return FAIL;
-if (buf->b_ml.ml_mfp == NULL)
-{
-	/* This can happen during startup when there is a stray "w" in the
-	 * vimrc file. */
-	emsg(_(e_emptybuf));
-	return FAIL;
-}
-/*
-* Disallow writing from .exrc and .vimrc in current directory for
-* security reasons.
-*/
-if (check_secure())
-	return FAIL;
-/* Avoid a crash for a long name. */
-if (STRLEN(fname) >= MAXPATHL)
-{
-	emsg(_(e_longname));
-	return FAIL;
-}
-/* must init bw_conv_buf and bw_iconv_fd before jumping to "fail" */
-write_info.bw_conv_buf = NULL;
-write_info.bw_conv_error = FALSE;
-write_info.bw_conv_error_lnum = 0;
-write_info.bw_restlen = 0;
-#ifdef USE_ICONV
-write_info.bw_iconv_fd = (iconv_t)-1;
-#endif
-#ifdef FEAT_CRYPT
-write_info.bw_buffer = buf;
-#endif
-/* After writing a file changedtick changes but we don't want to display
-* the line. */
-ex_no_reprint = TRUE;
-/*
-* If there is no file name yet, use the one for the written file.
-* BF_NOTEDITED is set to reflect this (in case the write fails).
-* Don't do this when the write is for a filter command.
-* Don't do this when appending.
-* Only do this when 'cpoptions' contains the 'F' flag.
-*/
-if (buf->b_ffname == NULL
-	    && reset_changed
-	    && whole
-	    && buf == curbuf
-#ifdef FEAT_QUICKFIX
-	    && !bt_nofilename(buf)
-#endif
-	    && !filtering
-	    && (!append || vim_strchr(p_cpo, CPO_FNAMEAPP) != NULL)
-	    && vim_strchr(p_cpo, CPO_FNAMEW) != NULL)
-{
-	if (set_rw_fname(fname, sfname) == FAIL)
-	    return FAIL;
-	buf = curbuf;	    /* just in case autocmds made "buf" invalid */
-}
-if (sfname == NULL)
-	sfname = fname;
-/*
-* For Unix: Use the short file name whenever possible.
-* Avoids problems with networks and when directory names are changed.
-* Don't do this for MS-DOS, a "cd" in a sub-shell may have moved us to
-* another directory, which we don't detect
-*/
-ffname = fname;			    /* remember full fname */
-#ifdef UNIX
-fname = sfname;
-#endif
-if (buf->b_ffname != NULL && fnamecmp(ffname, buf->b_ffname) == 0)
-	overwriting = TRUE;
-else
-	overwriting = FALSE;
-if (exiting)
-	settmode(TMODE_COOK);	    /* when exiting allow typeahead now */
-++no_wait_return;		    /* don't wait for return yet */
-/*
-* Set '[ and '] marks to the lines to be written.
-*/
-buf->b_op_start.lnum = start;
-buf->b_op_start.col = 0;
-buf->b_op_end.lnum = end;
-buf->b_op_end.col = 0;
-{
-	aco_save_T	aco;
-	int		buf_ffname = FALSE;
-	int		buf_sfname = FALSE;
-	int		buf_fname_f = FALSE;
-	int		buf_fname_s = FALSE;
-	int		did_cmd = FALSE;
-	int		nofile_err = FALSE;
-	int		empty_memline = (buf->b_ml.ml_mfp == NULL);
-	bufref_T	bufref;
-	/*
-	 * Apply PRE autocommands.
-	 * Set curbuf to the buffer to be written.
-	 * Careful: The autocommands may call buf_write() recursively!
-	 */
-	if (ffname == buf->b_ffname)
-	    buf_ffname = TRUE;
-	if (sfname == buf->b_sfname)
-	    buf_sfname = TRUE;
-	if (fname == buf->b_ffname)
-	    buf_fname_f = TRUE;
-	if (fname == buf->b_sfname)
-	    buf_fname_s = TRUE;
-	/* set curwin/curbuf to buf and save a few things */
-	aucmd_prepbuf(&aco, buf);
-	set_bufref(&bufref, buf);
-	if (append)
-	{
-	    if (!(did_cmd = apply_autocmds_exarg(EVENT_FILEAPPENDCMD,
-					 sfname, sfname, FALSE, curbuf, eap)))
-	    {
-#ifdef FEAT_QUICKFIX
-		if (overwriting && bt_nofilename(curbuf))
-		    nofile_err = TRUE;
-		else
-#endif
-		    apply_autocmds_exarg(EVENT_FILEAPPENDPRE,
-					  sfname, sfname, FALSE, curbuf, eap);
-	    }
-	}
-	else if (filtering)
-	{
-	    apply_autocmds_exarg(EVENT_FILTERWRITEPRE,
-					    NULL, sfname, FALSE, curbuf, eap);
-	}
-	else if (reset_changed && whole)
-	{
-	    int was_changed = curbufIsChanged();
-	    did_cmd = apply_autocmds_exarg(EVENT_BUFWRITECMD,
-					  sfname, sfname, FALSE, curbuf, eap);
-	    if (did_cmd)
-	    {
-		if (was_changed && !curbufIsChanged())
-		{
-		    /* Written everything correctly and BufWriteCmd has reset
-		     * 'modified': Correct the undo information so that an
-		     * undo now sets 'modified'. */
-		    u_unchanged(curbuf);
-		    u_update_save_nr(curbuf);
-		}
-	    }
-	    else
-	    {
-#ifdef FEAT_QUICKFIX
-		if (overwriting && bt_nofilename(curbuf))
-		    nofile_err = TRUE;
-		else
-#endif
-		    apply_autocmds_exarg(EVENT_BUFWRITEPRE,
-					  sfname, sfname, FALSE, curbuf, eap);
-	    }
-	}
-	else
-	{
-	    if (!(did_cmd = apply_autocmds_exarg(EVENT_FILEWRITECMD,
-					 sfname, sfname, FALSE, curbuf, eap)))
-	    {
-#ifdef FEAT_QUICKFIX
-		if (overwriting && bt_nofilename(curbuf))
-		    nofile_err = TRUE;
-		else
-#endif
-		    apply_autocmds_exarg(EVENT_FILEWRITEPRE,
-					  sfname, sfname, FALSE, curbuf, eap);
-	    }
-	}
-	/* restore curwin/curbuf and a few other things */
-	aucmd_restbuf(&aco);
-	/*
-	 * In three situations we return here and don't write the file:
-	 * 1. the autocommands deleted or unloaded the buffer.
-	 * 2. The autocommands abort script processing.
-	 * 3. If one of the "Cmd" autocommands was executed.
-	 */
-	if (!bufref_valid(&bufref))
-	    buf = NULL;
-	if (buf == NULL || (buf->b_ml.ml_mfp == NULL && !empty_memline)
-				       || did_cmd || nofile_err
-#ifdef FEAT_EVAL
-				       || aborting()
-#endif
-				       )
-	{
-	    --no_wait_return;
-	    msg_scroll = msg_save;
-	    if (nofile_err)
-		emsg(_("E676: No matching autocommands for acwrite buffer"));
-	    if (nofile_err
-#ifdef FEAT_EVAL
-		    || aborting()
-#endif
-		    )
-		/* An aborting error, interrupt or exception in the
-		 * autocommands. */
-		return FAIL;
-	    if (did_cmd)
-	    {
-		if (buf == NULL)
-		    /* The buffer was deleted.  We assume it was written
-		     * (can't retry anyway). */
-		    return OK;
-		if (overwriting)
-		{
-		    /* Assume the buffer was written, update the timestamp. */
-		    ml_timestamp(buf);
-		    if (append)
-			buf->b_flags &= ~BF_NEW;
-		    else
-			buf->b_flags &= ~BF_WRITE_MASK;
-		}
-		if (reset_changed && buf->b_changed && !append
-			&& (overwriting || vim_strchr(p_cpo, CPO_PLUS) != NULL))
-		    /* Buffer still changed, the autocommands didn't work
-		     * properly. */
-		    return FAIL;
-		return OK;
-	    }
-#ifdef FEAT_EVAL
-	    if (!aborting())
-#endif
-		emsg(_("E203: Autocommands deleted or unloaded buffer to be written"));
-	    return FAIL;
-	}
-	/*
-	 * The autocommands may have changed the number of lines in the file.
-	 * When writing the whole file, adjust the end.
-	 * When writing part of the file, assume that the autocommands only
-	 * changed the number of lines that are to be written (tricky!).
-	 */
-	if (buf->b_ml.ml_line_count != old_line_count)
-	{
-	    if (whole)						/* write all */
-		end = buf->b_ml.ml_line_count;
-	    else if (buf->b_ml.ml_line_count > old_line_count)	/* more lines */
-		end += buf->b_ml.ml_line_count - old_line_count;
-	    else						/* less lines */
-	    {
-		end -= old_line_count - buf->b_ml.ml_line_count;
-		if (end < start)
-		{
-		    --no_wait_return;
-		    msg_scroll = msg_save;
-		    emsg(_("E204: Autocommand changed number of lines in unexpected way"));
-		    return FAIL;
-		}
-	    }
-	}
-	/*
-	 * The autocommands may have changed the name of the buffer, which may
-	 * be kept in fname, ffname and sfname.
-	 */
-	if (buf_ffname)
-	    ffname = buf->b_ffname;
-	if (buf_sfname)
-	    sfname = buf->b_sfname;
-	if (buf_fname_f)
-	    fname = buf->b_ffname;
-	if (buf_fname_s)
-	    fname = buf->b_sfname;
-}
-#ifdef FEAT_NETBEANS_INTG
-if (netbeans_active() && isNetbeansBuffer(buf))
-{
-	if (whole)
-	{
-	    /*
-	     * b_changed can be 0 after an undo, but we still need to write
-	     * the buffer to NetBeans.
-	     */
-	    if (buf->b_changed || isNetbeansModified(buf))
-	    {
-		--no_wait_return;		/* may wait for return now */
-		msg_scroll = msg_save;
-		netbeans_save_buffer(buf);	/* no error checking... */
-		return retval;
-	    }
-	    else
-	    {
-		errnum = (char_u *)"E656: ";
-		errmsg = (char_u *)_("NetBeans disallows writes of unmodified buffers");
-		buffer = NULL;
-		goto fail;
-	    }
-	}
-	else
-	{
-	    errnum = (char_u *)"E657: ";
-	    errmsg = (char_u *)_("Partial writes disallowed for NetBeans buffers");
-	    buffer = NULL;
-	    goto fail;
-	}
-}
-#endif
-if (shortmess(SHM_OVER) && !exiting)
-	msg_scroll = FALSE;	    /* overwrite previous file message */
-else
-	msg_scroll = TRUE;	    /* don't overwrite previous file message */
-if (!filtering)
-	filemess(buf,
-#ifndef UNIX
-		sfname,
-#else
-		fname,
-#endif
-		    (char_u *)"", 0);	/* show that we are busy */
-msg_scroll = FALSE;		    /* always overwrite the file message now */
-buffer = alloc(BUFSIZE);
-if (buffer == NULL)		    /* can't allocate big buffer, use small
-				     * one (to be able to write when out of
-				     * memory) */
-{
-	buffer = smallbuf;
-	bufsize = SMBUFSIZE;
-}
-else
-	bufsize = BUFSIZE;
-/*
-* Get information about original file (if there is one).
-*/
-#if defined(UNIX)
-st_old.st_dev = 0;
-st_old.st_ino = 0;
-perm = -1;
-if (mch_stat((char *)fname, &st_old) < 0)
-	newfile = TRUE;
-else
-{
-	perm = st_old.st_mode;
-	if (!S_ISREG(st_old.st_mode))		/* not a file */
-	{
-	    if (S_ISDIR(st_old.st_mode))
-	    {
-		errnum = (char_u *)"E502: ";
-		errmsg = (char_u *)_("is a directory");
-		goto fail;
-	    }
-	    if (mch_nodetype(fname) != NODE_WRITABLE)
-	    {
-		errnum = (char_u *)"E503: ";
-		errmsg = (char_u *)_("is not a file or writable device");
-		goto fail;
-	    }
-	    /* It's a device of some kind (or a fifo) which we can write to
-	     * but for which we can't make a backup. */
-	    device = TRUE;
-	    newfile = TRUE;
-	    perm = -1;
-	}
-}
-#else /* !UNIX */
-/*
-* Check for a writable device name.
-*/
-c = mch_nodetype(fname);
-if (c == NODE_OTHER)
-{
-	errnum = (char_u *)"E503: ";
-	errmsg = (char_u *)_("is not a file or writable device");
-	goto fail;
-}
-if (c == NODE_WRITABLE)
-{
-# if defined(MSWIN)
-	/* MS-Windows allows opening a device, but we will probably get stuck
-	 * trying to write to it.  */
-	if (!p_odev)
-	{
-	    errnum = (char_u *)"E796: ";
-	    errmsg = (char_u *)_("writing to device disabled with 'opendevice' option");
-	    goto fail;
-	}
-# endif
-	device = TRUE;
-	newfile = TRUE;
-	perm = -1;
-}
-else
-{
-	perm = mch_getperm(fname);
-	if (perm < 0)
-	    newfile = TRUE;
-	else if (mch_isdir(fname))
-	{
-	    errnum = (char_u *)"E502: ";
-	    errmsg = (char_u *)_("is a directory");
-	    goto fail;
-	}
-	if (overwriting)
-	    (void)mch_stat((char *)fname, &st_old);
-}
-#endif /* !UNIX */
-if (!device && !newfile)
-{
-	/*
-	 * Check if the file is really writable (when renaming the file to
-	 * make a backup we won't discover it later).
-	 */
-	file_readonly = check_file_readonly(fname, (int)perm);
-	if (!forceit && file_readonly)
-	{
-	    if (vim_strchr(p_cpo, CPO_FWRITE) != NULL)
-	    {
-		errnum = (char_u *)"E504: ";
-		errmsg = (char_u *)_(err_readonly);
-	    }
-	    else
-	    {
-		errnum = (char_u *)"E505: ";
-		errmsg = (char_u *)_("is read-only (add ! to override)");
-	    }
-	    goto fail;
-	}
-	/*
-	 * Check if the timestamp hasn't changed since reading the file.
-	 */
-	if (overwriting)
-	{
-	    retval = check_mtime(buf, &st_old);
-	    if (retval == FAIL)
-		goto fail;
-	}
-}
-#ifdef HAVE_ACL
-/*
-* For systems that support ACL: get the ACL from the original file.
-*/
-if (!newfile)
-	acl = mch_get_acl(fname);
-#endif
-/*
-* If 'backupskip' is not empty, don't make a backup for some files.
-*/
-dobackup = (p_wb || p_bk || *p_pm != NUL);
-#ifdef FEAT_WILDIGN
-if (dobackup && *p_bsk != NUL && match_file_list(p_bsk, sfname, ffname))
-	dobackup = FALSE;
-#endif
-/*
-* Save the value of got_int and reset it.  We don't want a previous
-* interruption cancel writing, only hitting CTRL-C while writing should
-* abort it.
-*/
-prev_got_int = got_int;
-got_int = FALSE;
-/* Mark the buffer as 'being saved' to prevent changed buffer warnings */
-buf->b_saving = TRUE;
-/*
-* If we are not appending or filtering, the file exists, and the
-* 'writebackup', 'backup' or 'patchmode' option is set, need a backup.
-* When 'patchmode' is set also make a backup when appending.
-*
-* Do not make any backup, if 'writebackup' and 'backup' are both switched
-* off.  This helps when editing large files on almost-full disks.
-*/
-if (!(append && *p_pm == NUL) && !filtering && perm >= 0 && dobackup)
-{
-#if defined(UNIX) || defined(MSWIN)
-	stat_T	    st;
-#endif
-	if ((bkc & BKC_YES) || append)	/* "yes" */
-	    backup_copy = TRUE;
-#if defined(UNIX) || defined(MSWIN)
-	else if ((bkc & BKC_AUTO))	/* "auto" */
-	{
-	    int		i;
-# ifdef UNIX
-	    /*
-	     * Don't rename the file when:
-	     * - it's a hard link
-	     * - it's a symbolic link
-	     * - we don't have write permission in the directory
-	     * - we can't set the owner/group of the new file
-	     */
-	    if (st_old.st_nlink > 1
-		    || mch_lstat((char *)fname, &st) < 0
-		    || st.st_dev != st_old.st_dev
-		    || st.st_ino != st_old.st_ino
-#  ifndef HAVE_FCHOWN
-		    || st.st_uid != st_old.st_uid
-		    || st.st_gid != st_old.st_gid
-#  endif
-		    )
-		backup_copy = TRUE;
-	    else
-# else
-#  ifdef MSWIN
-	    /* On NTFS file systems hard links are possible. */
-	    if (mch_is_linked(fname))
-		backup_copy = TRUE;
-	    else
-#  endif
-# endif
-	    {
-		/*
-		 * Check if we can create a file and set the owner/group to
-		 * the ones from the original file.
-		 * First find a file name that doesn't exist yet (use some
-		 * arbitrary numbers).
-		 */
-		STRCPY(IObuff, fname);
-		for (i = 4913; ; i += 123)
-		{
-		    sprintf((char *)gettail(IObuff), "%d", i);
-		    if (mch_lstat((char *)IObuff, &st) < 0)
-			break;
-		}
-		fd = mch_open((char *)IObuff,
-				    O_CREAT|O_WRONLY|O_EXCL|O_NOFOLLOW, perm);
-		if (fd < 0)	/* can't write in directory */
-		    backup_copy = TRUE;
-		else
-		{
-# ifdef UNIX
-#  ifdef HAVE_FCHOWN
-		    vim_ignored = fchown(fd, st_old.st_uid, st_old.st_gid);
-#  endif
-		    if (mch_stat((char *)IObuff, &st) < 0
-			    || st.st_uid != st_old.st_uid
-			    || st.st_gid != st_old.st_gid
-			    || (long)st.st_mode != perm)
-			backup_copy = TRUE;
-# endif
-		    /* Close the file before removing it, on MS-Windows we
-		     * can't delete an open file. */
-		    close(fd);
-		    mch_remove(IObuff);
-# ifdef MSWIN
-		    /* MS-Windows may trigger a virus scanner to open the
-		     * file, we can't delete it then.  Keep trying for half a
-		     * second. */
-		    {
-			int try;
-			for (try = 0; try < 10; ++try)
-			{
-			    if (mch_lstat((char *)IObuff, &st) < 0)
-				break;
-			    ui_delay(50L, TRUE);  /* wait 50 msec */
-			    mch_remove(IObuff);
-			}
-		    }
-# endif
-		}
-	    }
-	}
-	/*
-	 * Break symlinks and/or hardlinks if we've been asked to.
-	 */
-	if ((bkc & BKC_BREAKSYMLINK) || (bkc & BKC_BREAKHARDLINK))
-	{
-# ifdef UNIX
-	    int	lstat_res;
-	    lstat_res = mch_lstat((char *)fname, &st);
-	    /* Symlinks. */
-	    if ((bkc & BKC_BREAKSYMLINK)
-		    && lstat_res == 0
-		    && st.st_ino != st_old.st_ino)
-		backup_copy = FALSE;
-	    /* Hardlinks. */
-	    if ((bkc & BKC_BREAKHARDLINK)
-		    && st_old.st_nlink > 1
-		    && (lstat_res != 0 || st.st_ino == st_old.st_ino))
-		backup_copy = FALSE;
-# else
-#  if defined(MSWIN)
-	    /* Symlinks. */
-	    if ((bkc & BKC_BREAKSYMLINK) && mch_is_symbolic_link(fname))
-		backup_copy = FALSE;
-	    /* Hardlinks. */
-	    if ((bkc & BKC_BREAKHARDLINK) && mch_is_hard_link(fname))
-		backup_copy = FALSE;
-#  endif
-# endif
-	}
-#endif
-	/* make sure we have a valid backup extension to use */
-	if (*p_bex == NUL)
-	    backup_ext = (char_u *)".bak";
-	else
-	    backup_ext = p_bex;
-	if (backup_copy
-		&& (fd = mch_open((char *)fname, O_RDONLY | O_EXTRA, 0)) >= 0)
-	{
-	    int		bfd;
-	    char_u	*copybuf, *wp;
-	    int		some_error = FALSE;
-	    stat_T	st_new;
-	    char_u	*dirp;
-	    char_u	*rootname;
-#if defined(UNIX) || defined(MSWIN)
-	    char_u      *p;
-#endif
-#if defined(UNIX)
-	    int		did_set_shortname;
-	    mode_t	umask_save;
-#endif
-	    copybuf = alloc(BUFSIZE + 1);
-	    if (copybuf == NULL)
-	    {
-		some_error = TRUE;	    /* out of memory */
-		goto nobackup;
-	    }
-	    /*
-	     * Try to make the backup in each directory in the 'bdir' option.
-	     *
-	     * Unix semantics has it, that we may have a writable file,
-	     * that cannot be recreated with a simple open(..., O_CREAT, ) e.g:
-	     *  - the directory is not writable,
-	     *  - the file may be a symbolic link,
-	     *  - the file may belong to another user/group, etc.
-	     *
-	     * For these reasons, the existing writable file must be truncated
-	     * and reused. Creation of a backup COPY will be attempted.
-	     */
-	    dirp = p_bdir;
-	    while (*dirp)
-	    {
-#ifdef UNIX
-		st_new.st_ino = 0;
-		st_new.st_dev = 0;
-		st_new.st_gid = 0;
-#endif
-		/*
-		 * Isolate one directory name, using an entry in 'bdir'.
-		 */
-		(void)copy_option_part(&dirp, copybuf, BUFSIZE, ",");
-#if defined(UNIX) || defined(MSWIN)
-		p = copybuf + STRLEN(copybuf);
-		if (after_pathsep(copybuf, p) && p[-1] == p[-2])
-		    // Ends with '//', use full path
-		    if ((p = make_percent_swname(copybuf, fname)) != NULL)
-		    {
-			backup = modname(p, backup_ext, FALSE);
-			vim_free(p);
-		    }
-#endif
-		rootname = get_file_in_dir(fname, copybuf);
-		if (rootname == NULL)
-		{
-		    some_error = TRUE;	    /* out of memory */
-		    goto nobackup;
-		}
-#if defined(UNIX)
-		did_set_shortname = FALSE;
-#endif
-		/*
-		 * May try twice if 'shortname' not set.
-		 */
-		for (;;)
-		{
-		    /*
-		     * Make the backup file name.
-		     */
-		    if (backup == NULL)
-			backup = buf_modname((buf->b_p_sn || buf->b_shortname),
-						 rootname, backup_ext, FALSE);
-		    if (backup == NULL)
-		    {
-			vim_free(rootname);
-			some_error = TRUE;		/* out of memory */
-			goto nobackup;
-		    }
-		    /*
-		     * Check if backup file already exists.
-		     */
-		    if (mch_stat((char *)backup, &st_new) >= 0)
-		    {
-#ifdef UNIX
-			/*
-			 * Check if backup file is same as original file.
-			 * May happen when modname() gave the same file back.
-			 * E.g. silly link, or file name-length reached.
-			 * If we don't check here, we either ruin the file
-			 * when copying or erase it after writing. jw.
-			 */
-			if (st_new.st_dev == st_old.st_dev
-					    && st_new.st_ino == st_old.st_ino)
-			{
-			    VIM_CLEAR(backup);	/* no backup file to delete */
-			    /*
-			     * may try again with 'shortname' set
-			     */
-			    if (!(buf->b_shortname || buf->b_p_sn))
-			    {
-				buf->b_shortname = TRUE;
-				did_set_shortname = TRUE;
-				continue;
-			    }
-				/* setting shortname didn't help */
-			    if (did_set_shortname)
-				buf->b_shortname = FALSE;
-			    break;
-			}
-#endif
-			/*
-			 * If we are not going to keep the backup file, don't
-			 * delete an existing one, try to use another name.
-			 * Change one character, just before the extension.
-			 */
-			if (!p_bk)
-			{
-			    wp = backup + STRLEN(backup) - 1
-							 - STRLEN(backup_ext);
-			    if (wp < backup)	/* empty file name ??? */
-				wp = backup;
-			    *wp = 'z';
-			    while (*wp > 'a'
-				    && mch_stat((char *)backup, &st_new) >= 0)
-				--*wp;
-			    /* They all exist??? Must be something wrong. */
-			    if (*wp == 'a')
-				VIM_CLEAR(backup);
-			}
-		    }
-		    break;
-		}
-		vim_free(rootname);
-		/*
-		 * Try to create the backup file
-		 */
-		if (backup != NULL)
-		{
-		    /* remove old backup, if present */
-		    mch_remove(backup);
-		    /* Open with O_EXCL to avoid the file being created while
-		     * we were sleeping (symlink hacker attack?). Reset umask
-		     * if possible to avoid mch_setperm() below. */
-#ifdef UNIX
-		    umask_save = umask(0);
-#endif
-		    bfd = mch_open((char *)backup,
-				O_WRONLY|O_CREAT|O_EXTRA|O_EXCL|O_NOFOLLOW,
-								 perm & 0777);
-#ifdef UNIX
-		    (void)umask(umask_save);
-#endif
-		    if (bfd < 0)
-			VIM_CLEAR(backup);
-		    else
-		    {
-			/* Set file protection same as original file, but
-			 * strip s-bit.  Only needed if umask() wasn't used
-			 * above. */
-#ifndef UNIX
-			(void)mch_setperm(backup, perm & 0777);
-#else
-			/*
-			 * Try to set the group of the backup same as the
-			 * original file. If this fails, set the protection
-			 * bits for the group same as the protection bits for
-			 * others.
-			 */
-			if (st_new.st_gid != st_old.st_gid
-# ifdef HAVE_FCHOWN  /* sequent-ptx lacks fchown() */
-				&& fchown(bfd, (uid_t)-1, st_old.st_gid) != 0
-# endif
-						)
-			    mch_setperm(backup,
-					  (perm & 0707) | ((perm & 07) << 3));
-# if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
-			mch_copy_sec(fname, backup);
-# endif
-#endif
-			/*
-			 * copy the file.
-			 */
-			write_info.bw_fd = bfd;
-			write_info.bw_buf = copybuf;
-#ifdef HAS_BW_FLAGS
-			write_info.bw_flags = FIO_NOCONVERT;
-#endif
-			while ((write_info.bw_len = read_eintr(fd, copybuf,
-								BUFSIZE)) > 0)
-			{
-			    if (buf_write_bytes(&write_info) == FAIL)
-			    {
-				errmsg = (char_u *)_("E506: Can't write to backup file (add ! to override)");
-				break;
-			    }
-			    ui_breakcheck();
-			    if (got_int)
-			    {
-				errmsg = (char_u *)_(e_interr);
-				break;
-			    }
-			}
-			if (close(bfd) < 0 && errmsg == NULL)
-			    errmsg = (char_u *)_("E507: Close error for backup file (add ! to override)");
-			if (write_info.bw_len < 0)
-			    errmsg = (char_u *)_("E508: Can't read file for backup (add ! to override)");
-#ifdef UNIX
-			set_file_time(backup, st_old.st_atime, st_old.st_mtime);
-#endif
-#ifdef HAVE_ACL
-			mch_set_acl(backup, acl);
-#endif
-#if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
-			mch_copy_sec(fname, backup);
-#endif
-			break;
-		    }
-		}
-	    }
-nobackup:
-	    close(fd);		/* ignore errors for closing read file */
-	    vim_free(copybuf);
-	    if (backup == NULL && errmsg == NULL)
-		errmsg = (char_u *)_("E509: Cannot create backup file (add ! to override)");
-	    /* ignore errors when forceit is TRUE */
-	    if ((some_error || errmsg != NULL) && !forceit)
-	    {
-		retval = FAIL;
-		goto fail;
-	    }
-	    errmsg = NULL;
-	}
-	else
-	{
-	    char_u	*dirp;
-	    char_u	*p;
-	    char_u	*rootname;
-	    /*
-	     * Make a backup by renaming the original file.
-	     */
-	    /*
-	     * If 'cpoptions' includes the "W" flag, we don't want to
-	     * overwrite a read-only file.  But rename may be possible
-	     * anyway, thus we need an extra check here.
-	     */
-	    if (file_readonly && vim_strchr(p_cpo, CPO_FWRITE) != NULL)
-	    {
-		errnum = (char_u *)"E504: ";
-		errmsg = (char_u *)_(err_readonly);
-		goto fail;
-	    }
-	    /*
-	     *
-	     * Form the backup file name - change path/fo.o.h to
-	     * path/fo.o.h.bak Try all directories in 'backupdir', first one
-	     * that works is used.
-	     */
-	    dirp = p_bdir;
-	    while (*dirp)
-	    {
-		/*
-		 * Isolate one directory name and make the backup file name.
-		 */
-		(void)copy_option_part(&dirp, IObuff, IOSIZE, ",");
-#if defined(UNIX) || defined(MSWIN)
-		p = IObuff + STRLEN(IObuff);
-		if (after_pathsep(IObuff, p) && p[-1] == p[-2])
-		    // path ends with '//', use full path
-		    if ((p = make_percent_swname(IObuff, fname)) != NULL)
-		    {
-			backup = modname(p, backup_ext, FALSE);
-			vim_free(p);
-		    }
-#endif
-		if (backup == NULL)
-		{
-		    rootname = get_file_in_dir(fname, IObuff);
-		    if (rootname == NULL)
-			backup = NULL;
-		    else
-		    {
-			backup = buf_modname(
-				(buf->b_p_sn || buf->b_shortname),
-						rootname, backup_ext, FALSE);
-			vim_free(rootname);
-		    }
-		}
-		if (backup != NULL)
-		{
-		    /*
-		     * If we are not going to keep the backup file, don't
-		     * delete an existing one, try to use another name.
-		     * Change one character, just before the extension.
-		     */
-		    if (!p_bk && mch_getperm(backup) >= 0)
-		    {
-			p = backup + STRLEN(backup) - 1 - STRLEN(backup_ext);
-			if (p < backup)	/* empty file name ??? */
-			    p = backup;
-			*p = 'z';
-			while (*p > 'a' && mch_getperm(backup) >= 0)
-			    --*p;
-			/* They all exist??? Must be something wrong! */
-			if (*p == 'a')
-			    VIM_CLEAR(backup);
-		    }
-		}
-		if (backup != NULL)
-		{
-		    /*
-		     * Delete any existing backup and move the current version
-		     * to the backup.	For safety, we don't remove the backup
-		     * until the write has finished successfully. And if the
-		     * 'backup' option is set, leave it around.
-		     */
-		    /*
-		     * If the renaming of the original file to the backup file
-		     * works, quit here.
-		     */
-		    if (vim_rename(fname, backup) == 0)
-			break;
-		    VIM_CLEAR(backup);   /* don't do the rename below */
-		}
-	    }
-	    if (backup == NULL && !forceit)
-	    {
-		errmsg = (char_u *)_("E510: Can't make backup file (add ! to override)");
-		goto fail;
-	    }
-	}
-}
-#if defined(UNIX)
-/* When using ":w!" and the file was read-only: make it writable */
-if (forceit && perm >= 0 && !(perm & 0200) && st_old.st_uid == getuid()
-				     && vim_strchr(p_cpo, CPO_FWRITE) == NULL)
-{
-	perm |= 0200;
-	(void)mch_setperm(fname, perm);
-	made_writable = TRUE;
-}
-#endif
-/* When using ":w!" and writing to the current file, 'readonly' makes no
-* sense, reset it, unless 'Z' appears in 'cpoptions'.  */
-if (forceit && overwriting && vim_strchr(p_cpo, CPO_KEEPRO) == NULL)
-{
-	buf->b_p_ro = FALSE;
-#ifdef FEAT_TITLE
-	need_maketitle = TRUE;	    /* set window title later */
-#endif
-	status_redraw_all();	    /* redraw status lines later */
-}
-if (end > buf->b_ml.ml_line_count)
-	end = buf->b_ml.ml_line_count;
-if (buf->b_ml.ml_flags & ML_EMPTY)
-	start = end + 1;
-/*
-* If the original file is being overwritten, there is a small chance that
-* we crash in the middle of writing. Therefore the file is preserved now.
-* This makes all block numbers positive so that recovery does not need
-* the original file.
-* Don't do this if there is a backup file and we are exiting.
-*/
-if (reset_changed && !newfile && overwriting
-					      && !(exiting && backup != NULL))
-{
-	ml_preserve(buf, FALSE);
-	if (got_int)
-	{
-	    errmsg = (char_u *)_(e_interr);
-	    goto restore_backup;
-	}
-}
-#ifdef VMS
-vms_remove_version(fname); /* remove version */
-#endif
-/* Default: write the file directly.  May write to a temp file for
-* multi-byte conversion. */
-wfname = fname;
-/* Check for forced 'fileencoding' from "++opt=val" argument. */
-if (eap != NULL && eap->force_enc != 0)
-{
-	fenc = eap->cmd + eap->force_enc;
-	fenc = enc_canonize(fenc);
-	fenc_tofree = fenc;
-}
-else
-	fenc = buf->b_p_fenc;
-/*
-* Check if the file needs to be converted.
-*/
-converted = need_conversion(fenc);
-/*
-* Check if UTF-8 to UCS-2/4 or Latin1 conversion needs to be done.  Or
-* Latin1 to Unicode conversion.  This is handled in buf_write_bytes().
-* Prepare the flags for it and allocate bw_conv_buf when needed.
-*/
-if (converted && (enc_utf8 || STRCMP(p_enc, "latin1") == 0))
-{
-	wb_flags = get_fio_flags(fenc);
-	if (wb_flags & (FIO_UCS2 | FIO_UCS4 | FIO_UTF16 | FIO_UTF8))
-	{
-	    /* Need to allocate a buffer to translate into. */
-	    if (wb_flags & (FIO_UCS2 | FIO_UTF16 | FIO_UTF8))
-		write_info.bw_conv_buflen = bufsize * 2;
-	    else /* FIO_UCS4 */
-		write_info.bw_conv_buflen = bufsize * 4;
-	    write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
-	    if (write_info.bw_conv_buf == NULL)
-		end = 0;
-	}
-}
-#ifdef MSWIN
-if (converted && wb_flags == 0 && (wb_flags = get_win_fio_flags(fenc)) != 0)
-{
-	/* Convert UTF-8 -> UCS-2 and UCS-2 -> DBCS.  Worst-case * 4: */
-	write_info.bw_conv_buflen = bufsize * 4;
-	write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
-	if (write_info.bw_conv_buf == NULL)
-	    end = 0;
-}
-#endif
-#ifdef MACOS_CONVERT
-if (converted && wb_flags == 0 && (wb_flags = get_mac_fio_flags(fenc)) != 0)
-{
-	write_info.bw_conv_buflen = bufsize * 3;
-	write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
-	if (write_info.bw_conv_buf == NULL)
-	    end = 0;
-}
-#endif
-#if defined(FEAT_EVAL) || defined(USE_ICONV)
-if (converted && wb_flags == 0)
-{
-# ifdef USE_ICONV
-	/*
-	 * Use iconv() conversion when conversion is needed and it's not done
-	 * internally.
-	 */
-	write_info.bw_iconv_fd = (iconv_t)my_iconv_open(fenc,
-					enc_utf8 ? (char_u *)"utf-8" : p_enc);
-	if (write_info.bw_iconv_fd != (iconv_t)-1)
-	{
-	    /* We're going to use iconv(), allocate a buffer to convert in. */
-	    write_info.bw_conv_buflen = bufsize * ICONV_MULT;
-	    write_info.bw_conv_buf = alloc(write_info.bw_conv_buflen);
-	    if (write_info.bw_conv_buf == NULL)
-		end = 0;
-	    write_info.bw_first = TRUE;
-	}
-#  ifdef FEAT_EVAL
-	else
-#  endif
-# endif
-# ifdef FEAT_EVAL
-	    /*
-	     * When the file needs to be converted with 'charconvert' after
-	     * writing, write to a temp file instead and let the conversion
-	     * overwrite the original file.
-	     */
-	    if (*p_ccv != NUL)
-	    {
-		wfname = vim_tempname('w', FALSE);
-		if (wfname == NULL)	/* Can't write without a tempfile! */
-		{
-		    errmsg = (char_u *)_("E214: Can't find temp file for writing");
-		    goto restore_backup;
-		}
-	    }
-# endif
-}
-#endif
-if (converted && wb_flags == 0
-#ifdef USE_ICONV
-	    && write_info.bw_iconv_fd == (iconv_t)-1
-# endif
-# ifdef FEAT_EVAL
-	    && wfname == fname
-# endif
-	    )
-{
-	if (!forceit)
-	{
-	    errmsg = (char_u *)_("E213: Cannot convert (add ! to write without conversion)");
-	    goto restore_backup;
-	}
-	notconverted = TRUE;
-}
-/*
-* If conversion is taking place, we may first pretend to write and check
-* for conversion errors.  Then loop again to write for real.
-* When not doing conversion this writes for real right away.
-*/
-for (checking_conversion = TRUE; ; checking_conversion = FALSE)
-{
-	/*
-	 * There is no need to check conversion when:
-	 * - there is no conversion
-	 * - we make a backup file, that can be restored in case of conversion
-	 *   failure.
-	 */
-	if (!converted || dobackup)
-	    checking_conversion = FALSE;
-	if (checking_conversion)
-	{
-	    /* Make sure we don't write anything. */
-	    fd = -1;
-	    write_info.bw_fd = fd;
-	}
-	else
-	{
-#ifdef HAVE_FTRUNCATE
-# define TRUNC_ON_OPEN 0
-#else
-# define TRUNC_ON_OPEN O_TRUNC
-#endif
-	    /*
-	     * Open the file "wfname" for writing.
-	     * We may try to open the file twice: If we can't write to the file
-	     * and forceit is TRUE we delete the existing file and try to
-	     * create a new one. If this still fails we may have lost the
-	     * original file!  (this may happen when the user reached his
-	     * quotum for number of files).
-	     * Appending will fail if the file does not exist and forceit is
-	     * FALSE.
-	     */
-	    while ((fd = mch_open((char *)wfname, O_WRONLY | O_EXTRA | (append
-				? (forceit ? (O_APPEND | O_CREAT) : O_APPEND)
-				: (O_CREAT | TRUNC_ON_OPEN))
-				, perm < 0 ? 0666 : (perm & 0777))) < 0)
-	    {
-		/*
-		 * A forced write will try to create a new file if the old one
-		 * is still readonly. This may also happen when the directory
-		 * is read-only. In that case the mch_remove() will fail.
-		 */
-		if (errmsg == NULL)
-		{
-#ifdef UNIX
-		    stat_T	st;
-		    /* Don't delete the file when it's a hard or symbolic link.
-		     */
-		    if ((!newfile && st_old.st_nlink > 1)
-			    || (mch_lstat((char *)fname, &st) == 0
-				&& (st.st_dev != st_old.st_dev
-				    || st.st_ino != st_old.st_ino)))
-			errmsg = (char_u *)_("E166: Can't open linked file for writing");
-		    else
-#endif
-		    {
-			errmsg = (char_u *)_("E212: Can't open file for writing");
-			if (forceit && vim_strchr(p_cpo, CPO_FWRITE) == NULL
-								  && perm >= 0)
-			{
-#ifdef UNIX
-			    /* we write to the file, thus it should be marked
-			       writable after all */
-			    if (!(perm & 0200))
-				made_writable = TRUE;
-			    perm |= 0200;
-			    if (st_old.st_uid != getuid()
-						  || st_old.st_gid != getgid())
-				perm &= 0777;
-#endif
-			    if (!append)  /* don't remove when appending */
-				mch_remove(wfname);
-			    continue;
-			}
-		    }
-		}
-restore_backup:
-		{
-		    stat_T	st;
-		    /*
-		     * If we failed to open the file, we don't need a backup.
-		     * Throw it away.  If we moved or removed the original file
-		     * try to put the backup in its place.
-		     */
-		    if (backup != NULL && wfname == fname)
-		    {
-			if (backup_copy)
-			{
-			    /*
-			     * There is a small chance that we removed the
-			     * original, try to move the copy in its place.
-			     * This may not work if the vim_rename() fails.
-			     * In that case we leave the copy around.
-			     */
-			    /* If file does not exist, put the copy in its
-			     * place */
-			    if (mch_stat((char *)fname, &st) < 0)
-				vim_rename(backup, fname);
-			    /* if original file does exist throw away the copy
-			     */
-			    if (mch_stat((char *)fname, &st) >= 0)
-				mch_remove(backup);
-			}
-			else
-			{
-			    /* try to put the original file back */
-			    vim_rename(backup, fname);
-			}
-		    }
-		    /* if original file no longer exists give an extra warning
-		     */
-		    if (!newfile && mch_stat((char *)fname, &st) < 0)
-			end = 0;
-		}
-		if (wfname != fname)
-		    vim_free(wfname);
-		goto fail;
-	    }
-	    write_info.bw_fd = fd;
-#if defined(UNIX)
-	    {
-		stat_T	st;
-		/* Double check we are writing the intended file before making
-		 * any changes. */
-		if (overwriting
-			&& (!dobackup || backup_copy)
-			&& fname == wfname
-			&& perm >= 0
-			&& mch_fstat(fd, &st) == 0
-			&& st.st_ino != st_old.st_ino)
-		{
-		    close(fd);
-		    errmsg = (char_u *)_("E949: File changed while writing");
-		    goto fail;
-		}
-	    }
-#endif
-#ifdef HAVE_FTRUNCATE
-	    if (!append)
-		vim_ignored = ftruncate(fd, (off_t)0);
-#endif
-#if defined(MSWIN)
-	    if (backup != NULL && overwriting && !append)
-	    {
-		if (backup_copy)
-		    (void)mch_copy_file_attribute(wfname, backup);
-		else
-		    (void)mch_copy_file_attribute(backup, wfname);
-	    }
-	    if (!overwriting && !append)
-	    {
-		if (buf->b_ffname != NULL)
-		    (void)mch_copy_file_attribute(buf->b_ffname, wfname);
-		/* Should copy resource fork */
-	    }
-#endif
-#ifdef FEAT_CRYPT
-	    if (*buf->b_p_key != NUL && !filtering)
-	    {
-		char_u		*header;
-		int		header_len;
-		buf->b_cryptstate = crypt_create_for_writing(
-						      crypt_get_method_nr(buf),
-					   buf->b_p_key, &header, &header_len);
-		if (buf->b_cryptstate == NULL || header == NULL)
-		    end = 0;
-		else
-		{
-		    /* Write magic number, so that Vim knows how this file is
-		     * encrypted when reading it back. */
-		    write_info.bw_buf = header;
-		    write_info.bw_len = header_len;
-		    write_info.bw_flags = FIO_NOCONVERT;
-		    if (buf_write_bytes(&write_info) == FAIL)
-			end = 0;
-		    wb_flags |= FIO_ENCRYPTED;
-		    vim_free(header);
-		}
-	    }
-#endif
-	}
-	errmsg = NULL;
-	write_info.bw_buf = buffer;
-	nchars = 0;
-	/* use "++bin", "++nobin" or 'binary' */
-	if (eap != NULL && eap->force_bin != 0)
-	    write_bin = (eap->force_bin == FORCE_BIN);
-	else
-	    write_bin = buf->b_p_bin;
-	/*
-	 * The BOM is written just after the encryption magic number.
-	 * Skip it when appending and the file already existed, the BOM only
-	 * makes sense at the start of the file.
-	 */
-	if (buf->b_p_bomb && !write_bin && (!append || perm < 0))
-	{
-	    write_info.bw_len = make_bom(buffer, fenc);
-	    if (write_info.bw_len > 0)
-	    {
-		/* don't convert, do encryption */
-		write_info.bw_flags = FIO_NOCONVERT | wb_flags;
-		if (buf_write_bytes(&write_info) == FAIL)
-		    end = 0;
-		else
-		    nchars += write_info.bw_len;
-	    }
-	}
-	write_info.bw_start_lnum = start;
-#ifdef FEAT_PERSISTENT_UNDO
-	write_undo_file = (buf->b_p_udf
-			    && overwriting
-			    && !append
-			    && !filtering
-			    && reset_changed
-			    && !checking_conversion);
-	if (write_undo_file)
-	    /* Prepare for computing the hash value of the text. */
-	    sha256_start(&sha_ctx);
-#endif
-	write_info.bw_len = bufsize;
-#ifdef HAS_BW_FLAGS
-	write_info.bw_flags = wb_flags;
-#endif
-	fileformat = get_fileformat_force(buf, eap);
-	s = buffer;
-	len = 0;
-	for (lnum = start; lnum <= end; ++lnum)
-	{
-	    /*
-	     * The next while loop is done once for each character written.
-	     * Keep it fast!
-	     */
-	    ptr = ml_get_buf(buf, lnum, FALSE) - 1;
-#ifdef FEAT_PERSISTENT_UNDO
-	    if (write_undo_file)
-		sha256_update(&sha_ctx, ptr + 1,
-					      (UINT32_T)(STRLEN(ptr + 1) + 1));
-#endif
-	    while ((c = *++ptr) != NUL)
-	    {
-		if (c == NL)
-		    *s = NUL;		/* replace newlines with NULs */
-		else if (c == CAR && fileformat == EOL_MAC)
-		    *s = NL;		/* Mac: replace CRs with NLs */
-		else
-		    *s = c;
-		++s;
-		if (++len != bufsize)
-		    continue;
-		if (buf_write_bytes(&write_info) == FAIL)
-		{
-		    end = 0;		/* write error: break loop */
-		    break;
-		}
-		nchars += bufsize;
-		s = buffer;
-		len = 0;
-		write_info.bw_start_lnum = lnum;
-	    }
-	    /* write failed or last line has no EOL: stop here */
-	    if (end == 0
-		    || (lnum == end
-			&& (write_bin || !buf->b_p_fixeol)
-			&& (lnum == buf->b_no_eol_lnum
-			    || (lnum == buf->b_ml.ml_line_count
-							   && !buf->b_p_eol))))
-	    {
-		++lnum;			/* written the line, count it */
-		no_eol = TRUE;
-		break;
-	    }
-	    if (fileformat == EOL_UNIX)
-		*s++ = NL;
-	    else
-	    {
-		*s++ = CAR;		    /* EOL_MAC or EOL_DOS: write CR */
-		if (fileformat == EOL_DOS)  /* write CR-NL */
-		{
-		    if (++len == bufsize)
-		    {
-			if (buf_write_bytes(&write_info) == FAIL)
-			{
-			    end = 0;	/* write error: break loop */
-			    break;
-			}
-			nchars += bufsize;
-			s = buffer;
-			len = 0;
-		    }
-		    *s++ = NL;
-		}
-	    }
-	    if (++len == bufsize && end)
-	    {
-		if (buf_write_bytes(&write_info) == FAIL)
-		{
-		    end = 0;		/* write error: break loop */
-		    break;
-		}
-		nchars += bufsize;
-		s = buffer;
-		len = 0;
-		ui_breakcheck();
-		if (got_int)
-		{
-		    end = 0;		/* Interrupted, break loop */
-		    break;
-		}
-	    }
-#ifdef VMS
-	    /*
-	     * On VMS there is a problem: newlines get added when writing
-	     * blocks at a time. Fix it by writing a line at a time.
-	     * This is much slower!
-	     * Explanation: VAX/DECC RTL insists that records in some RMS
-	     * structures end with a newline (carriage return) character, and
-	     * if they don't it adds one.
-	     * With other RMS structures it works perfect without this fix.
-	     */
-	    if (buf->b_fab_rfm == FAB$C_VFC
-		    || ((buf->b_fab_rat & (FAB$M_FTN | FAB$M_CR)) != 0))
-	    {
-		int b2write;
-		buf->b_fab_mrs = (buf->b_fab_mrs == 0
-			? MIN(4096, bufsize)
-			: MIN(buf->b_fab_mrs, bufsize));
-		b2write = len;
-		while (b2write > 0)
-		{
-		    write_info.bw_len = MIN(b2write, buf->b_fab_mrs);
-		    if (buf_write_bytes(&write_info) == FAIL)
-		    {
-			end = 0;
-			break;
-		    }
-		    b2write -= MIN(b2write, buf->b_fab_mrs);
-		}
-		write_info.bw_len = bufsize;
-		nchars += len;
-		s = buffer;
-		len = 0;
-	    }
-#endif
-	}
-	if (len > 0 && end > 0)
-	{
-	    write_info.bw_len = len;
-	    if (buf_write_bytes(&write_info) == FAIL)
-		end = 0;		    /* write error */
-	    nchars += len;
-	}
-	/* Stop when writing done or an error was encountered. */
-	if (!checking_conversion || end == 0)
-	    break;
-	/* If no error happened until now, writing should be ok, so loop to
-	 * really write the buffer. */
-}
-/* If we started writing, finish writing. Also when an error was
-* encountered. */
-if (!checking_conversion)
-{
-#if defined(UNIX) && defined(HAVE_FSYNC)
-	/*
-	 * On many journalling file systems there is a bug that causes both the
-	 * original and the backup file to be lost when halting the system
-	 * right after writing the file.  That's because only the meta-data is
-	 * journalled.  Syncing the file slows down the system, but assures it
-	 * has been written to disk and we don't lose it.
-	 * For a device do try the fsync() but don't complain if it does not
-	 * work (could be a pipe).
-	 * If the 'fsync' option is FALSE, don't fsync().  Useful for laptops.
-	 */
-	if (p_fs && vim_fsync(fd) != 0 && !device)
-	{
-	    errmsg = (char_u *)_(e_fsync);
-	    end = 0;
-	}
-#endif
-#if defined(HAVE_SELINUX) || defined(HAVE_SMACK)
-	/* Probably need to set the security context. */
-	if (!backup_copy)
-	    mch_copy_sec(backup, wfname);
-#endif
-#ifdef UNIX
-	/* When creating a new file, set its owner/group to that of the
-	 * original file.  Get the new device and inode number. */
-	if (backup != NULL && !backup_copy)
-	{
-# ifdef HAVE_FCHOWN
-	    stat_T	st;
-	    /* Don't change the owner when it's already OK, some systems remove
-	     * permission or ACL stuff. */
-	    if (mch_stat((char *)wfname, &st) < 0
-		    || st.st_uid != st_old.st_uid
-		    || st.st_gid != st_old.st_gid)
-	    {
-		/* changing owner might not be possible */
-		vim_ignored = fchown(fd, st_old.st_uid, -1);
-		/* if changing group fails clear the group permissions */
-		if (fchown(fd, -1, st_old.st_gid) == -1 && perm > 0)
-		    perm &= ~070;
-	    }
-# endif
-	    buf_setino(buf);
-	}
-	else if (!buf->b_dev_valid)
-	    /* Set the inode when creating a new file. */
-	    buf_setino(buf);
-#endif
-#ifdef UNIX
-	if (made_writable)
-	    perm &= ~0200;	/* reset 'w' bit for security reasons */
-#endif
-#ifdef HAVE_FCHMOD
-	/* set permission of new file same as old file */
-	if (perm >= 0)
-	    (void)mch_fsetperm(fd, perm);
-#endif
-	if (close(fd) != 0)
-	{
-	    errmsg = (char_u *)_("E512: Close failed");
-	    end = 0;
-	}
-#ifndef HAVE_FCHMOD
-	/* set permission of new file same as old file */
-	if (perm >= 0)
-	    (void)mch_setperm(wfname, perm);
-#endif
-#ifdef HAVE_ACL
-	/*
-	 * Probably need to set the ACL before changing the user (can't set the
-	 * ACL on a file the user doesn't own).
-	 * On Solaris, with ZFS and the aclmode property set to "discard" (the
-	 * default), chmod() discards all part of a file's ACL that don't
-	 * represent the mode of the file.  It's non-trivial for us to discover
-	 * whether we're in that situation, so we simply always re-set the ACL.
-	 */
-# ifndef HAVE_SOLARIS_ZFS_ACL
-	if (!backup_copy)
-# endif
-	    mch_set_acl(wfname, acl);
-#endif
-#ifdef FEAT_CRYPT
-	if (buf->b_cryptstate != NULL)
-	{
-	    crypt_free_state(buf->b_cryptstate);
-	    buf->b_cryptstate = NULL;
-	}
-#endif
-#if defined(FEAT_EVAL)
-	if (wfname != fname)
-	{
-	    /*
-	     * The file was written to a temp file, now it needs to be
-	     * converted with 'charconvert' to (overwrite) the output file.
-	     */
-	    if (end != 0)
-	    {
-		if (eval_charconvert(enc_utf8 ? (char_u *)"utf-8" : p_enc,
-						  fenc, wfname, fname) == FAIL)
-		{
-		    write_info.bw_conv_error = TRUE;
-		    end = 0;
-		}
-	    }
-	    mch_remove(wfname);
-	    vim_free(wfname);
-	}
-#endif
-}
-if (end == 0)
-{
-	/*
-	 * Error encountered.
-	 */
-	if (errmsg == NULL)
-	{
-	    if (write_info.bw_conv_error)
-	    {
-		if (write_info.bw_conv_error_lnum == 0)
-		    errmsg = (char_u *)_("E513: write error, conversion failed (make 'fenc' empty to override)");
-		else
-		{
-		    errmsg_allocated = TRUE;
-		    errmsg = alloc(300);
-		    vim_snprintf((char *)errmsg, 300, _("E513: write error, conversion failed in line %ld (make 'fenc' empty to override)"),
-					 (long)write_info.bw_conv_error_lnum);
-		}
-	    }
-	    else if (got_int)
-		errmsg = (char_u *)_(e_interr);
-	    else
-		errmsg = (char_u *)_("E514: write error (file system full?)");
-	}
-	/*
-	 * If we have a backup file, try to put it in place of the new file,
-	 * because the new file is probably corrupt.  This avoids losing the
-	 * original file when trying to make a backup when writing the file a
-	 * second time.
-	 * When "backup_copy" is set we need to copy the backup over the new
-	 * file.  Otherwise rename the backup file.
-	 * If this is OK, don't give the extra warning message.
-	 */
-	if (backup != NULL)
-	{
-	    if (backup_copy)
-	    {
-		/* This may take a while, if we were interrupted let the user
-		 * know we got the message. */
-		if (got_int)
-		{
-		    msg(_(e_interr));
-		    out_flush();
-		}
-		if ((fd = mch_open((char *)backup, O_RDONLY | O_EXTRA, 0)) >= 0)
-		{
-		    if ((write_info.bw_fd = mch_open((char *)fname,
-				    O_WRONLY | O_CREAT | O_TRUNC | O_EXTRA,
-							   perm & 0777)) >= 0)
-		    {
-			/* copy the file. */
-			write_info.bw_buf = smallbuf;
-#ifdef HAS_BW_FLAGS
-			write_info.bw_flags = FIO_NOCONVERT;
-#endif
-			while ((write_info.bw_len = read_eintr(fd, smallbuf,
-						      SMBUFSIZE)) > 0)
-			    if (buf_write_bytes(&write_info) == FAIL)
-				break;
-			if (close(write_info.bw_fd) >= 0
-						   && write_info.bw_len == 0)
-			    end = 1;		/* success */
-		    }
-		    close(fd);	/* ignore errors for closing read file */
-		}
-	    }
-	    else
-	    {
-		if (vim_rename(backup, fname) == 0)
-		    end = 1;
-	    }
-	}
-	goto fail;
-}
-lnum -= start;	    /* compute number of written lines */
---no_wait_return;	    /* may wait for return now */
-#if !(defined(UNIX) || defined(VMS))
-fname = sfname;	    /* use shortname now, for the messages */
-#endif
-if (!filtering)
-{
-	msg_add_fname(buf, fname);	/* put fname in IObuff with quotes */
-	c = FALSE;
-	if (write_info.bw_conv_error)
-	{
-	    STRCAT(IObuff, _(" CONVERSION ERROR"));
-	    c = TRUE;
-	    if (write_info.bw_conv_error_lnum != 0)
-		vim_snprintf_add((char *)IObuff, IOSIZE, _(" in line %ld;"),
-			(long)write_info.bw_conv_error_lnum);
-	}
-	else if (notconverted)
-	{
-	    STRCAT(IObuff, _("[NOT converted]"));
-	    c = TRUE;
-	}
-	else if (converted)
-	{
-	    STRCAT(IObuff, _("[converted]"));
-	    c = TRUE;
-	}
-	if (device)
-	{
-	    STRCAT(IObuff, _("[Device]"));
-	    c = TRUE;
-	}
-	else if (newfile)
-	{
-	    STRCAT(IObuff, shortmess(SHM_NEW) ? _("[New]") : _("[New File]"));
-	    c = TRUE;
-	}
-	if (no_eol)
-	{
-	    msg_add_eol();
-	    c = TRUE;
-	}
-	/* may add [unix/dos/mac] */
-	if (msg_add_fileformat(fileformat))
-	    c = TRUE;
-#ifdef FEAT_CRYPT
-	if (wb_flags & FIO_ENCRYPTED)
-	{
-	    crypt_append_msg(buf);
-	    c = TRUE;
-	}
-#endif
-	msg_add_lines(c, (long)lnum, nchars);	/* add line/char count */
-	if (!shortmess(SHM_WRITE))
-	{
-	    if (append)
-		STRCAT(IObuff, shortmess(SHM_WRI) ? _(" [a]") : _(" appended"));
-	    else
-		STRCAT(IObuff, shortmess(SHM_WRI) ? _(" [w]") : _(" written"));
-	}
-	set_keep_msg((char_u *)msg_trunc_attr((char *)IObuff, FALSE, 0), 0);
-}
-/* When written everything correctly: reset 'modified'.  Unless not
-* writing to the original file and '+' is not in 'cpoptions'. */
-if (reset_changed && whole && !append
-	    && !write_info.bw_conv_error
-	    && (overwriting || vim_strchr(p_cpo, CPO_PLUS) != NULL))
-{
-	unchanged(buf, TRUE, FALSE);
-	/* b:changedtick is may be incremented in unchanged() but that
-	 * should not trigger a TextChanged event. */
-	if (buf->b_last_changedtick + 1 == CHANGEDTICK(buf))
-	    buf->b_last_changedtick = CHANGEDTICK(buf);
-	u_unchanged(buf);
-	u_update_save_nr(buf);
-}
-/*
-* If written to the current file, update the timestamp of the swap file
-* and reset the BF_WRITE_MASK flags. Also sets buf->b_mtime.
-*/
-if (overwriting)
-{
-	ml_timestamp(buf);
-	if (append)
-	    buf->b_flags &= ~BF_NEW;
-	else
-	    buf->b_flags &= ~BF_WRITE_MASK;
-}
-/*
-* If we kept a backup until now, and we are in patch mode, then we make
-* the backup file our 'original' file.
-*/
-if (*p_pm && dobackup)
-{
-	char *org = (char *)buf_modname((buf->b_p_sn || buf->b_shortname),
-							  fname, p_pm, FALSE);
-	if (backup != NULL)
-	{
-	    stat_T	st;
-	    /*
-	     * If the original file does not exist yet
-	     * the current backup file becomes the original file
-	     */
-	    if (org == NULL)
-		emsg(_("E205: Patchmode: can't save original file"));
-	    else if (mch_stat(org, &st) < 0)
-	    {
-		vim_rename(backup, (char_u *)org);
-		VIM_CLEAR(backup);	    /* don't delete the file */
-#ifdef UNIX
-		set_file_time((char_u *)org, st_old.st_atime, st_old.st_mtime);
-#endif
-	    }
-	}
-	/*
-	 * If there is no backup file, remember that a (new) file was
-	 * created.
-	 */
-	else
-	{
-	    int empty_fd;
-	    if (org == NULL
-		    || (empty_fd = mch_open(org,
-				      O_CREAT | O_EXTRA | O_EXCL | O_NOFOLLOW,
-					perm < 0 ? 0666 : (perm & 0777))) < 0)
-	      emsg(_("E206: patchmode: can't touch empty original file"));
-	    else
-	      close(empty_fd);
-	}
-	if (org != NULL)
-	{
-	    mch_setperm((char_u *)org, mch_getperm(fname) & 0777);
-	    vim_free(org);
-	}
-}
-// Remove the backup unless 'backup' option is set or there was a
-// conversion error.
-if (!p_bk && backup != NULL && !write_info.bw_conv_error
-	    && mch_remove(backup) != 0)
-	emsg(_("E207: Can't delete backup file"));
-goto nofail;
-/*
-* Finish up.  We get here either after failure or success.
-*/
-fail:
---no_wait_return;		/* may wait for return now */
-nofail:
-/* Done saving, we accept changed buffer warnings again */
-buf->b_saving = FALSE;
-vim_free(backup);
-if (buffer != smallbuf)
-	vim_free(buffer);
-vim_free(fenc_tofree);
-vim_free(write_info.bw_conv_buf);
-#ifdef USE_ICONV
-if (write_info.bw_iconv_fd != (iconv_t)-1)
-{
-	iconv_close(write_info.bw_iconv_fd);
-	write_info.bw_iconv_fd = (iconv_t)-1;
-}
-#endif
-#ifdef HAVE_ACL
-mch_free_acl(acl);
-#endif
-if (errmsg != NULL)
-{
-	int numlen = errnum != NULL ? (int)STRLEN(errnum) : 0;
-	attr = HL_ATTR(HLF_E);	/* set highlight for error messages */
-	msg_add_fname(buf,
-#ifndef UNIX
-		sfname
-#else
-		fname
-#endif
-		     );		/* put file name in IObuff with quotes */
-	if (STRLEN(IObuff) + STRLEN(errmsg) + numlen >= IOSIZE)
-	    IObuff[IOSIZE - STRLEN(errmsg) - numlen - 1] = NUL;
-	/* If the error message has the form "is ...", put the error number in
-	 * front of the file name. */
-	if (errnum != NULL)
-	{
-	    STRMOVE(IObuff + numlen, IObuff);
-	    mch_memmove(IObuff, errnum, (size_t)numlen);
-	}
-	STRCAT(IObuff, errmsg);
-	emsg((char *)IObuff);
-	if (errmsg_allocated)
-	    vim_free(errmsg);
-	retval = FAIL;
-	if (end == 0)
-	{
-	    msg_puts_attr(_("\nWARNING: Original file may be lost or damaged\n"),
-		    attr | MSG_HIST);
-	    msg_puts_attr(_("don't quit the editor until the file is successfully written!"),
-		    attr | MSG_HIST);
-	    /* Update the timestamp to avoid an "overwrite changed file"
-	     * prompt when writing again. */
-	    if (mch_stat((char *)fname, &st_old) >= 0)
-	    {
-		buf_store_time(buf, &st_old, fname);
-		buf->b_mtime_read = buf->b_mtime;
-	    }
-	}
-}
-msg_scroll = msg_save;
-#ifdef FEAT_PERSISTENT_UNDO
-/*
-* When writing the whole file and 'undofile' is set, also write the undo
-* file.
-*/
-if (retval == OK && write_undo_file)
-{
-	char_u	    hash[UNDO_HASH_SIZE];
-	sha256_finish(&sha_ctx, hash);
-	u_write_undo(NULL, FALSE, buf, hash);
-}
-#endif
-#ifdef FEAT_EVAL
-if (!should_abort(retval))
-#else
-if (!got_int)
-#endif
-{
-	aco_save_T	aco;
-	curbuf->b_no_eol_lnum = 0;  /* in case it was set by the previous read */
-	/*
-	 * Apply POST autocommands.
-	 * Careful: The autocommands may call buf_write() recursively!
-	 */
-	aucmd_prepbuf(&aco, buf);
-	if (append)
-	    apply_autocmds_exarg(EVENT_FILEAPPENDPOST, fname, fname,
-							  FALSE, curbuf, eap);
-	else if (filtering)
-	    apply_autocmds_exarg(EVENT_FILTERWRITEPOST, NULL, fname,
-							  FALSE, curbuf, eap);
-	else if (reset_changed && whole)
-	    apply_autocmds_exarg(EVENT_BUFWRITEPOST, fname, fname,
-							  FALSE, curbuf, eap);
-	else
-	    apply_autocmds_exarg(EVENT_FILEWRITEPOST, fname, fname,
-							  FALSE, curbuf, eap);
-	/* restore curwin/curbuf and a few other things */
-	aucmd_restbuf(&aco);
-#ifdef FEAT_EVAL
-	if (aborting())	    /* autocmds may abort script processing */
-	    retval = FALSE;
-#endif
-}
-got_int |= prev_got_int;
-return retval;
-}
 #if defined(HAVE_FSYNC) || defined(PROTO)
 /*
 * Call fsync() with Mac-specific exception.
 * Return fsync() result: zero for success.
 */
 /*
 * Set the name of the current buffer.  Use when the buffer doesn't have a
 * name and a ":r" or ":w" command with a file name is used.
 */
-static int
+int
 set_rw_fname(char_u *fname, char_u *sfname)
 {
 buf_T	*buf = curbuf;
 /* It's like the unnamed buffer is deleted.... */
 /*
 * Append message for text mode to IObuff.
 * Return TRUE if something appended.
 */
-static int
+int
 msg_add_fileformat(int eol_type)
 {
 #ifndef USE_CRNL
 if (eol_type == EOL_DOS)
 {
 }
 /*
 * Append message for missing line separator to IObuff.
 */
-static void
+void
 msg_add_eol(void)
 {
 STRCAT(IObuff, shortmess(SHM_LAST) ? _("[noeol]") : _("[Incomplete last line]"));
 }
-/*
+int
-* Check modification time of file, before writing to it.
-* The size isn't checked, because using a tool like "gzip" takes care of
-* using the same timestamp but can't set the size.
-*/
-static int
-check_mtime(buf_T *buf, stat_T *st)
-{
-if (buf->b_mtime_read != 0
-	    && time_differs((long)st->st_mtime, buf->b_mtime_read))
-{
-	msg_scroll = TRUE;	    /* don't overwrite messages here */
-	msg_silent = 0;		    /* must give this prompt */
-	/* don't use emsg() here, don't want to flush the buffers */
-	msg_attr(_("WARNING: The file has been changed since reading it!!!"),
-						       HL_ATTR(HLF_E));
-	if (ask_yesno((char_u *)_("Do you really want to write to it"),
-								 TRUE) == 'n')
-	    return FAIL;
-	msg_scroll = FALSE;	    /* always overwrite the file message now */
-}
-return OK;
-}
-static int
 time_differs(long t1, long t2)
 {
 #if defined(__linux__) || defined(MSWIN)
 /* On a FAT filesystem, esp. under Linux, there are only 5 bits to store
 * the seconds.  Since the roundoff is done when flushing the inode, the
 return (t1 != t2);
 #endif
 }
 /*
-* Call write() to write a number of bytes to the file.
-* Handles encryption and 'encoding' conversion.
-*
-* Return FAIL for failure, OK otherwise.
-*/
-static int
-buf_write_bytes(struct bw_info *ip)
-{
-int		wlen;
-char_u	*buf = ip->bw_buf;	/* data to write */
-int		len = ip->bw_len;	/* length of data */
-#ifdef HAS_BW_FLAGS
-int		flags = ip->bw_flags;	/* extra flags */
-#endif
-/*
-* Skip conversion when writing the crypt magic number or the BOM.
-*/
-if (!(flags & FIO_NOCONVERT))
-{
-	char_u		*p;
-	unsigned	c;
-	int		n;
-	if (flags & FIO_UTF8)
-	{
-	    /*
-	     * Convert latin1 in the buffer to UTF-8 in the file.
-	     */
-	    p = ip->bw_conv_buf;	/* translate to buffer */
-	    for (wlen = 0; wlen < len; ++wlen)
-		p += utf_char2bytes(buf[wlen], p);
-	    buf = ip->bw_conv_buf;
-	    len = (int)(p - ip->bw_conv_buf);
-	}
-	else if (flags & (FIO_UCS4 | FIO_UTF16 | FIO_UCS2 | FIO_LATIN1))
-	{
-	    /*
-	     * Convert UTF-8 bytes in the buffer to UCS-2, UCS-4, UTF-16 or
-	     * Latin1 chars in the file.
-	     */
-	    if (flags & FIO_LATIN1)
-		p = buf;	/* translate in-place (can only get shorter) */
-	    else
-		p = ip->bw_conv_buf;	/* translate to buffer */
-	    for (wlen = 0; wlen < len; wlen += n)
-	    {
-		if (wlen == 0 && ip->bw_restlen != 0)
-		{
-		    int		l;
-		    /* Use remainder of previous call.  Append the start of
-		     * buf[] to get a full sequence.  Might still be too
-		     * short! */
-		    l = CONV_RESTLEN - ip->bw_restlen;
-		    if (l > len)
-			l = len;
-		    mch_memmove(ip->bw_rest + ip->bw_restlen, buf, (size_t)l);
-		    n = utf_ptr2len_len(ip->bw_rest, ip->bw_restlen + l);
-		    if (n > ip->bw_restlen + len)
-		    {
-			/* We have an incomplete byte sequence at the end to
-			 * be written.  We can't convert it without the
-			 * remaining bytes.  Keep them for the next call. */
-			if (ip->bw_restlen + len > CONV_RESTLEN)
-			    return FAIL;
-			ip->bw_restlen += len;
-			break;
-		    }
-		    if (n > 1)
-			c = utf_ptr2char(ip->bw_rest);
-		    else
-			c = ip->bw_rest[0];
-		    if (n >= ip->bw_restlen)
-		    {
-			n -= ip->bw_restlen;
-			ip->bw_restlen = 0;
-		    }
-		    else
-		    {
-			ip->bw_restlen -= n;
-			mch_memmove(ip->bw_rest, ip->bw_rest + n,
-						      (size_t)ip->bw_restlen);
-			n = 0;
-		    }
-		}
-		else
-		{
-		    n = utf_ptr2len_len(buf + wlen, len - wlen);
-		    if (n > len - wlen)
-		    {
-			/* We have an incomplete byte sequence at the end to
-			 * be written.  We can't convert it without the
-			 * remaining bytes.  Keep them for the next call. */
-			if (len - wlen > CONV_RESTLEN)
-			    return FAIL;
-			ip->bw_restlen = len - wlen;
-			mch_memmove(ip->bw_rest, buf + wlen,
-						      (size_t)ip->bw_restlen);
-			break;
-		    }
-		    if (n > 1)
-			c = utf_ptr2char(buf + wlen);
-		    else
-			c = buf[wlen];
-		}
-		if (ucs2bytes(c, &p, flags) && !ip->bw_conv_error)
-		{
-		    ip->bw_conv_error = TRUE;
-		    ip->bw_conv_error_lnum = ip->bw_start_lnum;
-		}
-		if (c == NL)
-		    ++ip->bw_start_lnum;
-	    }
-	    if (flags & FIO_LATIN1)
-		len = (int)(p - buf);
-	    else
-	    {
-		buf = ip->bw_conv_buf;
-		len = (int)(p - ip->bw_conv_buf);
-	    }
-	}
-#ifdef MSWIN
-	else if (flags & FIO_CODEPAGE)
-	{
-	    /*
-	     * Convert UTF-8 or codepage to UCS-2 and then to MS-Windows
-	     * codepage.
-	     */
-	    char_u	*from;
-	    size_t	fromlen;
-	    char_u	*to;
-	    int		u8c;
-	    BOOL	bad = FALSE;
-	    int		needed;
-	    if (ip->bw_restlen > 0)
-	    {
-		/* Need to concatenate the remainder of the previous call and
-		 * the bytes of the current call.  Use the end of the
-		 * conversion buffer for this. */
-		fromlen = len + ip->bw_restlen;
-		from = ip->bw_conv_buf + ip->bw_conv_buflen - fromlen;
-		mch_memmove(from, ip->bw_rest, (size_t)ip->bw_restlen);
-		mch_memmove(from + ip->bw_restlen, buf, (size_t)len);
-	    }
-	    else
-	    {
-		from = buf;
-		fromlen = len;
-	    }
-	    to = ip->bw_conv_buf;
-	    if (enc_utf8)
-	    {
-		/* Convert from UTF-8 to UCS-2, to the start of the buffer.
-		 * The buffer has been allocated to be big enough. */
-		while (fromlen > 0)
-		{
-		    n = (int)utf_ptr2len_len(from, (int)fromlen);
-		    if (n > (int)fromlen)	/* incomplete byte sequence */
-			break;
-		    u8c = utf_ptr2char(from);
-		    *to++ = (u8c & 0xff);
-		    *to++ = (u8c >> 8);
-		    fromlen -= n;
-		    from += n;
-		}
-		/* Copy remainder to ip->bw_rest[] to be used for the next
-		 * call. */
-		if (fromlen > CONV_RESTLEN)
-		{
-		    /* weird overlong sequence */
-		    ip->bw_conv_error = TRUE;
-		    return FAIL;
-		}
-		mch_memmove(ip->bw_rest, from, fromlen);
-		ip->bw_restlen = (int)fromlen;
-	    }
-	    else
-	    {
-		/* Convert from enc_codepage to UCS-2, to the start of the
-		 * buffer.  The buffer has been allocated to be big enough. */
-		ip->bw_restlen = 0;
-		needed = MultiByteToWideChar(enc_codepage,
-			     MB_ERR_INVALID_CHARS, (LPCSTR)from, (int)fromlen,
-								     NULL, 0);
-		if (needed == 0)
-		{
-		    /* When conversion fails there may be a trailing byte. */
-		    needed = MultiByteToWideChar(enc_codepage,
-			 MB_ERR_INVALID_CHARS, (LPCSTR)from, (int)fromlen - 1,
-								     NULL, 0);
-		    if (needed == 0)
-		    {
-			/* Conversion doesn't work. */
-			ip->bw_conv_error = TRUE;
-			return FAIL;
-		    }
-		    /* Save the trailing byte for the next call. */
-		    ip->bw_rest[0] = from[fromlen - 1];
-		    ip->bw_restlen = 1;
-		}
-		needed = MultiByteToWideChar(enc_codepage, MB_ERR_INVALID_CHARS,
-				(LPCSTR)from, (int)(fromlen - ip->bw_restlen),
-							  (LPWSTR)to, needed);
-		if (needed == 0)
-		{
-		    /* Safety check: Conversion doesn't work. */
-		    ip->bw_conv_error = TRUE;
-		    return FAIL;
-		}
-		to += needed * 2;
-	    }
-	    fromlen = to - ip->bw_conv_buf;
-	    buf = to;
-# ifdef CP_UTF8	/* VC 4.1 doesn't define CP_UTF8 */
-	    if (FIO_GET_CP(flags) == CP_UTF8)
-	    {
-		/* Convert from UCS-2 to UTF-8, using the remainder of the
-		 * conversion buffer.  Fails when out of space. */
-		for (from = ip->bw_conv_buf; fromlen > 1; fromlen -= 2)
-		{
-		    u8c = *from++;
-		    u8c += (*from++ << 8);
-		    to += utf_char2bytes(u8c, to);
-		    if (to + 6 >= ip->bw_conv_buf + ip->bw_conv_buflen)
-		    {
-			ip->bw_conv_error = TRUE;
-			return FAIL;
-		    }
-		}
-		len = (int)(to - buf);
-	    }
-	    else
-# endif
-	    {
-		/* Convert from UCS-2 to the codepage, using the remainder of
-		 * the conversion buffer.  If the conversion uses the default
-		 * character "0", the data doesn't fit in this encoding, so
-		 * fail. */
-		len = WideCharToMultiByte(FIO_GET_CP(flags), 0,
-			(LPCWSTR)ip->bw_conv_buf, (int)fromlen / sizeof(WCHAR),
-			(LPSTR)to, (int)(ip->bw_conv_buflen - fromlen), 0,
-									&bad);
-		if (bad)
-		{
-		    ip->bw_conv_error = TRUE;
-		    return FAIL;
-		}
-	    }
-	}
-#endif
-#ifdef MACOS_CONVERT
-	else if (flags & FIO_MACROMAN)
-	{
-	    /*
-	     * Convert UTF-8 or latin1 to Apple MacRoman.
-	     */
-	    char_u	*from;
-	    size_t	fromlen;
-	    if (ip->bw_restlen > 0)
-	    {
-		/* Need to concatenate the remainder of the previous call and
-		 * the bytes of the current call.  Use the end of the
-		 * conversion buffer for this. */
-		fromlen = len + ip->bw_restlen;
-		from = ip->bw_conv_buf + ip->bw_conv_buflen - fromlen;
-		mch_memmove(from, ip->bw_rest, (size_t)ip->bw_restlen);
-		mch_memmove(from + ip->bw_restlen, buf, (size_t)len);
-	    }
-	    else
-	    {
-		from = buf;
-		fromlen = len;
-	    }
-	    if (enc2macroman(from, fromlen,
-			ip->bw_conv_buf, &len, ip->bw_conv_buflen,
-			ip->bw_rest, &ip->bw_restlen) == FAIL)
-	    {
-		ip->bw_conv_error = TRUE;
-		return FAIL;
-	    }
-	    buf = ip->bw_conv_buf;
-	}
-#endif
-#ifdef USE_ICONV
-	if (ip->bw_iconv_fd != (iconv_t)-1)
-	{
-	    const char	*from;
-	    size_t	fromlen;
-	    char	*to;
-	    size_t	tolen;
-	    /* Convert with iconv(). */
-	    if (ip->bw_restlen > 0)
-	    {
-		char *fp;
-		/* Need to concatenate the remainder of the previous call and
-		 * the bytes of the current call.  Use the end of the
-		 * conversion buffer for this. */
-		fromlen = len + ip->bw_restlen;
-		fp = (char *)ip->bw_conv_buf + ip->bw_conv_buflen - fromlen;
-		mch_memmove(fp, ip->bw_rest, (size_t)ip->bw_restlen);
-		mch_memmove(fp + ip->bw_restlen, buf, (size_t)len);
-		from = fp;
-		tolen = ip->bw_conv_buflen - fromlen;
-	    }
-	    else
-	    {
-		from = (const char *)buf;
-		fromlen = len;
-		tolen = ip->bw_conv_buflen;
-	    }
-	    to = (char *)ip->bw_conv_buf;
-	    if (ip->bw_first)
-	    {
-		size_t	save_len = tolen;
-		/* output the initial shift state sequence */
-		(void)iconv(ip->bw_iconv_fd, NULL, NULL, &to, &tolen);
-		/* There is a bug in iconv() on Linux (which appears to be
-		 * wide-spread) which sets "to" to NULL and messes up "tolen".
-		 */
-		if (to == NULL)
-		{
-		    to = (char *)ip->bw_conv_buf;
-		    tolen = save_len;
-		}
-		ip->bw_first = FALSE;
-	    }
-	    /*
-	     * If iconv() has an error or there is not enough room, fail.
-	     */
-	    if ((iconv(ip->bw_iconv_fd, (void *)&from, &fromlen, &to, &tolen)
-			== (size_t)-1 && ICONV_ERRNO != ICONV_EINVAL)
-						    || fromlen > CONV_RESTLEN)
-	    {
-		ip->bw_conv_error = TRUE;
-		return FAIL;
-	    }
-	    /* copy remainder to ip->bw_rest[] to be used for the next call. */
-	    if (fromlen > 0)
-		mch_memmove(ip->bw_rest, (void *)from, fromlen);
-	    ip->bw_restlen = (int)fromlen;
-	    buf = ip->bw_conv_buf;
-	    len = (int)((char_u *)to - ip->bw_conv_buf);
-	}
-#endif
-}
-if (ip->bw_fd < 0)
-	/* Only checking conversion, which is OK if we get here. */
-	return OK;
-#ifdef FEAT_CRYPT
-if (flags & FIO_ENCRYPTED)
-{
-	/* Encrypt the data. Do it in-place if possible, otherwise use an
-	 * allocated buffer. */
-# ifdef CRYPT_NOT_INPLACE
-	if (crypt_works_inplace(ip->bw_buffer->b_cryptstate))
-	{
-# endif
-	    crypt_encode_inplace(ip->bw_buffer->b_cryptstate, buf, len);
-# ifdef CRYPT_NOT_INPLACE
-	}
-	else
-	{
-	    char_u *outbuf;
-	    len = crypt_encode_alloc(curbuf->b_cryptstate, buf, len, &outbuf);
-	    if (len == 0)
-		return OK;  /* Crypt layer is buffering, will flush later. */
-	    wlen = write_eintr(ip->bw_fd, outbuf, len);
-	    vim_free(outbuf);
-	    return (wlen < len) ? FAIL : OK;
-	}
-# endif
-}
-#endif
-wlen = write_eintr(ip->bw_fd, buf, len);
-return (wlen < len) ? FAIL : OK;
-}
-/*
-* Convert a Unicode character to bytes.
-* Return TRUE for an error, FALSE when it's OK.
-*/
-static int
-ucs2bytes(
-unsigned	c,		/* in: character */
-char_u	**pp,		/* in/out: pointer to result */
-int		flags)		/* FIO_ flags */
-{
-char_u	*p = *pp;
-int		error = FALSE;
-int		cc;
-if (flags & FIO_UCS4)
-{
-	if (flags & FIO_ENDIAN_L)
-	{
-	    *p++ = c;
-	    *p++ = (c >> 8);
-	    *p++ = (c >> 16);
-	    *p++ = (c >> 24);
-	}
-	else
-	{
-	    *p++ = (c >> 24);
-	    *p++ = (c >> 16);
-	    *p++ = (c >> 8);
-	    *p++ = c;
-	}
-}
-else if (flags & (FIO_UCS2 | FIO_UTF16))
-{
-	if (c >= 0x10000)
-	{
-	    if (flags & FIO_UTF16)
-	    {
-		/* Make two words, ten bits of the character in each.  First
-		 * word is 0xd800 - 0xdbff, second one 0xdc00 - 0xdfff */
-		c -= 0x10000;
-		if (c >= 0x100000)
-		    error = TRUE;
-		cc = ((c >> 10) & 0x3ff) + 0xd800;
-		if (flags & FIO_ENDIAN_L)
-		{
-		    *p++ = cc;
-		    *p++ = ((unsigned)cc >> 8);
-		}
-		else
-		{
-		    *p++ = ((unsigned)cc >> 8);
-		    *p++ = cc;
-		}
-		c = (c & 0x3ff) + 0xdc00;
-	    }
-	    else
-		error = TRUE;
-	}
-	if (flags & FIO_ENDIAN_L)
-	{
-	    *p++ = c;
-	    *p++ = (c >> 8);
-	}
-	else
-	{
-	    *p++ = (c >> 8);
-	    *p++ = c;
-	}
-}
-else    /* Latin1 */
-{
-	if (c >= 0x100)
-	{
-	    error = TRUE;
-	    *p++ = 0xBF;
-	}
-	else
-	    *p++ = c;
-}
-*pp = p;
-return error;
-}
-/*
 * Return TRUE if file encoding "fenc" requires conversion from or to
 * 'encoding'.
 */
-static int
+int
 need_conversion(char_u *fenc)
 {
 int		same_encoding;
 int		enc_flags;
 int		fenc_flags;
 /*
 * Check "ptr" for a unicode encoding and return the FIO_ flags needed for the
 * internal conversion.
 * if "ptr" is an empty string, use 'encoding'.
 */
-static int
+int
 get_fio_flags(char_u *ptr)
 {
 int		prop;
 if (*ptr == NUL)
 	return FIO_LATIN1;
 /* must be ENC_DBCS, requires iconv() */
 return 0;
 }
-#ifdef MSWIN
+#if defined(MSWIN) || defined(PROTO)
 /*
 * Check "ptr" for a MS-Windows codepage name and return the FIO_ flags needed
 * for the conversion MS-Windows can do for us.  Also accept "utf-8".
 * Used for conversion between 'encoding' and 'fileencoding'.
 */
-static int
+int
 get_win_fio_flags(char_u *ptr)
 {
 int		cp;
 /* Cannot do this when 'encoding' is not utf-8 and not a codepage. */
 }
 return FIO_PUT_CP(cp) | FIO_CODEPAGE;
 }
 #endif
-#ifdef MACOS_CONVERT
+#if defined(MACOS_CONVERT) || defined(PROTO)
 /*
 * Check "ptr" for a Carbon supported encoding and return the FIO_ flags
 * needed for the internal conversion to/from utf-8 or latin1.
 */
-static int
+int
 get_mac_fio_flags(char_u *ptr)
 {
 if ((enc_utf8 || STRCMP(p_enc, "latin1") == 0)
 				     && (enc_canon_props(ptr) & ENC_MACROMAN))
 	return FIO_MACROMAN;
 	len = 4;
 }
 *lenp = len;
 return (char_u *)name;
-}
-/*
-* Generate a BOM in "buf[4]" for encoding "name".
-* Return the length of the BOM (zero when no BOM).
-*/
-static int
-make_bom(char_u *buf, char_u *name)
-{
-int		flags;
-char_u	*p;
-flags = get_fio_flags(name);
-/* Can't put a BOM in a non-Unicode file. */
-if (flags == FIO_LATIN1 || flags == 0)
-	return 0;
-if (flags == FIO_UTF8)	/* UTF-8 */
-{
-	buf[0] = 0xef;
-	buf[1] = 0xbb;
-	buf[2] = 0xbf;
-	return 3;
-}
-p = buf;
-(void)ucs2bytes(0xfeff, &p, flags);
-return (int)(p - buf);
 }
 /*
 * Try to find a shortname by comparing the fullname with the current
 * directory.
 	mch_free_acl(acl);
 #endif
 	return -1;
 }
-buffer = alloc(BUFSIZE);
+buffer = alloc(WRITEBUFSIZE);
 if (buffer == NULL)
 {
 	close(fd_out);
 	close(fd_in);
 #ifdef HAVE_ACL
 	mch_free_acl(acl);
 #endif
 	return -1;
 }
-while ((n = read_eintr(fd_in, buffer, BUFSIZE)) > 0)
+while ((n = read_eintr(fd_in, buffer, WRITEBUFSIZE)) > 0)
 	if (write_eintr(fd_out, buffer, n) != n)
 	{
 	    errmsg = _("E208: Error writing to \"%s\"");
 	    break;
 	}

Mercurial > vim

comparison src/fileio.c @ 18199:e2be5a6485f5 v8.1.2094