File: [local] / src / usr.bin / vim / Attic / fileio.c (download)
Revision 1.2, Sat Sep 21 06:22:58 1996 UTC (27 years, 8 months ago) by downsj
Branch: MAIN
CVS Tags: OPENBSD_2_0_BASE, OPENBSD_2_0
Changes since 1.1: +206 -43 lines
update to vim 4.4beta
|
/* $OpenBSD: fileio.c,v 1.2 1996/09/21 06:22:58 downsj Exp $ */
/* vi:set ts=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.
*/
/*
* fileio.c: read from and write to a file
*/
#if defined MSDOS || defined WIN32
# include <io.h> /* for lseek(), must be before vim.h */
#endif
#include "vim.h"
#include "globals.h"
#include "proto.h"
#include "option.h"
#ifdef HAVE_FCNTL_H
# include <fcntl.h>
#endif
#ifdef LATTICE
# include <proto/dos.h> /* for Lock() and UnLock() */
#endif
#define BUFSIZE 8192 /* size of normal write buffer */
#define SBUFSIZE 256 /* size of emergency write buffer */
#ifdef VIMINFO
static void check_marks_read __ARGS((void));
#endif
static void msg_add_fname __ARGS((BUF *, char_u *));
static int msg_add_textmode __ARGS((int));
static void msg_add_lines __ARGS((int, long, long));
static void msg_add_eol __ARGS((void));
static int write_buf __ARGS((int, char_u *, int));
static linenr_t write_no_eol_lnum = 0; /* non-zero lnum when last line of
next binary write should not have
an end-of-line */
void
filemess(buf, name, s)
BUF *buf;
char_u *name;
char_u *s;
{
msg_add_fname(buf, name); /* put file name in IObuff with quotes */
STRCAT(IObuff, s);
/*
* For the first message may have to start a new line.
* For further ones overwrite the previous one, reset msg_scroll before
* calling filemess().
*/
msg_start();
msg_outtrans(IObuff);
stop_highlight();
msg_clr_eos();
flushbuf();
}
/*
* Read lines from file 'fname' into the buffer after line 'from'.
*
* 1. We allocate blocks with lalloc, as big as possible.
* 2. Each block is filled with characters from the file with a single read().
* 3. The lines are inserted in the buffer with ml_append().
*
* (caller must check that fname != NULL)
*
* lines_to_skip is the number of lines that must be skipped
* lines_to_read is the number of lines that are appended
* When not recovering lines_to_skip is 0 and lines_to_read MAXLNUM.
*
* return FAIL for failure, OK otherwise
*/
int
readfile(fname, sfname, from, newfile, lines_to_skip, lines_to_read, filtering)
char_u *fname;
char_u *sfname;
linenr_t from;
int newfile;
linenr_t lines_to_skip;
linenr_t lines_to_read;
int filtering;
{
int fd;
register char_u c;
register linenr_t lnum = from;
register char_u *ptr = NULL; /* pointer into read buffer */
register char_u *buffer = NULL; /* read buffer */
char_u *new_buffer = NULL; /* init to shut up gcc */
char_u *line_start = NULL; /* init to shut up gcc */
colnr_t len;
register long size;
register char_u *p;
long filesize = 0;
int split = 0; /* number of split lines */
#define UNKNOWN 0x0fffffff /* file size is unknown */
linenr_t linecnt;
int error = FALSE; /* errors encountered */
int tx_error = FALSE; /* textmode, but no CR */
long linerest = 0; /* remaining chars in line */
int firstpart = TRUE; /* reading first part */
#ifdef UNIX
int perm;
#endif
int textmode; /* accept CR-LF linebreak */
struct stat st;
int file_readonly;
linenr_t skip_count = lines_to_skip;
linenr_t read_count = lines_to_read;
int msg_save = msg_scroll;
linenr_t read_no_eol_lnum = 0; /* non-zero lnum when last
line of last read was
missing the eol */
#ifdef AUTOCMD
write_no_eol_lnum = 0; /* in case it was set by the previous read */
#endif
/*
* If there is no file name yet, use the one for the read file.
* b_notedited is set to reflect this.
* Don't do this for a read from a filter.
* Only do this when 'cpoptions' contains the 'f' flag.
*/
if (curbuf->b_filename == NULL && !filtering &&
vim_strchr(p_cpo, CPO_FNAMER) != NULL)
{
if (setfname(fname, sfname, FALSE) == OK)
curbuf->b_notedited = TRUE;
}
if (shortmess(SHM_OVER) || curbuf->b_help)
msg_scroll = FALSE; /* overwrite previous file message */
else
msg_scroll = TRUE; /* don't overwrite previous file message */
if (sfname == NULL)
sfname = fname;
/*
* For Unix: Use the short filename 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.
*/
#if defined(UNIX) || defined(__EMX__)
if (!did_cd)
fname = sfname;
#endif
#ifdef UNIX
/*
* On Unix it is possible to read a directory, so we have to
* check for it before the open().
*/
perm = getperm(fname);
# ifdef _POSIX_SOURCE
if (perm >= 0 && !S_ISREG(perm) /* not a regular file ... */
# ifdef S_ISFIFO
&& !S_ISFIFO(perm) /* ... or fifo or socket */
# endif
)
# else
if (perm >= 0 && (perm & S_IFMT) != S_IFREG /* not a regular file ... */
# ifdef S_IFIFO
&& (perm & S_IFMT) != S_IFIFO /* ... or fifo ... */
# endif
# ifdef S_IFSOCK
&& (perm & S_IFMT) != S_IFSOCK /* ... or socket */
# endif
)
# endif
{
# ifdef _POSIX_SOURCE
if (S_ISDIR(perm))
# else
if ((perm & S_IFMT) == S_IFDIR)
# endif
filemess(curbuf, fname, (char_u *)"is a directory");
else
filemess(curbuf, fname, (char_u *)"is not a file");
msg_scroll = msg_save;
return FAIL;
}
#endif
/*
* When opening a new file we take the readonly flag from the file.
* Default is r/w, can be set to r/o below.
* Don't reset it when in readonly mode
*/
if (newfile && !readonlymode) /* default: set file not readonly */
curbuf->b_p_ro = FALSE;
if (newfile)
{
if (stat((char *)fname, &st) >= 0) /* remember time of file */
{
curbuf->b_mtime = st.st_mtime;
curbuf->b_mtime_read = st.st_mtime;
#ifdef UNIX
/*
* Set the protection bits of the swap file equal to the original
* file. This makes it possible for others to read the name of the
* original file from the swapfile.
*/
if (curbuf->b_ml.ml_mfp->mf_fname != NULL)
(void)setperm(curbuf->b_ml.ml_mfp->mf_fname,
(st.st_mode & 0777) | 0600);
#endif
}
else
{
curbuf->b_mtime = 0;
curbuf->b_mtime_read = 0;
}
}
/*
* for UNIX: check readonly with perm and access()
* for MSDOS and Amiga: check readonly by trying to open the file for writing
*/
file_readonly = FALSE;
#if defined(UNIX) || defined(DJGPP) || defined(__EMX__)
if (
# ifdef UNIX
!(perm & 0222) ||
# endif
access((char *)fname, W_OK))
file_readonly = TRUE;
fd = open((char *)fname, O_RDONLY | O_EXTRA);
#else
if (!newfile || readonlymode || (fd =
open((char *)fname, O_RDWR | O_EXTRA)) < 0)
{
file_readonly = TRUE;
fd = open((char *)fname, O_RDONLY | O_EXTRA); /* try to open ro */
}
#endif
if (fd < 0) /* cannot open at all */
{
#ifndef UNIX
int isdir_f;
#endif
msg_scroll = msg_save;
#ifndef UNIX
/*
* On MSDOS and Amiga we can't open a directory, check here.
*/
isdir_f = (mch_isdir(fname));
/* replace with short name now, for the messages */
if (!did_cd)
fname = sfname;
if (isdir_f)
filemess(curbuf, fname, (char_u *)"is a directory");
else
#endif
if (newfile)
{
#ifdef UNIX
if (perm < 0)
#endif
{
filemess(curbuf, fname, (char_u *)"[New File]");
#ifdef AUTOCMD
apply_autocmds(EVENT_BUFNEWFILE, fname, fname);
#endif
return OK; /* a new file is not an error */
}
#ifdef UNIX
else
filemess(curbuf, fname, (char_u *)"[Permission Denied]");
#endif
}
return FAIL;
}
/*
* Only set the 'ro' flag for readonly files the first time they are
* loaded.
* Help files always get readonly mode
*/
if ((newfile && file_readonly) || curbuf->b_help)
curbuf->b_p_ro = TRUE;
if (newfile)
curbuf->b_p_eol = TRUE;
#ifndef UNIX
/* replace with short name now, for the messages */
if (!did_cd)
fname = sfname;
#endif
++no_wait_return; /* don't wait for return yet */
/*
* Set '[ mark to the line above where the lines go (line 1 if zero).
*/
curbuf->b_op_start.lnum = ((from == 0) ? 1 : from);
curbuf->b_op_start.col = 0;
#ifdef AUTOCMD
{
int m = msg_scroll;
int n = msg_scrolled;
BUF *old_curbuf = curbuf;
/*
* The file must be closed again, the autocommands may want to change
* the file before reading it.
*/
close(fd); /* ignore errors */
/*
* The output from the autocommands should not overwrite anything and
* should not be overwritten: Set msg_scroll, restore its value if no
* output was done.
*/
msg_scroll = TRUE;
if (filtering)
apply_autocmds(EVENT_FILTERREADPRE, NULL, fname);
else if (newfile)
apply_autocmds(EVENT_BUFREADPRE, NULL, fname);
else
apply_autocmds(EVENT_FILEREADPRE, fname, fname);
if (msg_scrolled == n)
msg_scroll = m;
/*
* Don't allow the autocommands to change the current buffer.
* Try to re-open the file.
*/
if (curbuf != old_curbuf ||
(fd = open((char *)fname, O_RDONLY | O_EXTRA)) < 0)
{
--no_wait_return;
msg_scroll = msg_save;
if (fd < 0)
EMSG("*ReadPre autocommands made the file unreadable");
else
EMSG("*ReadPre autocommands must not change current buffer");
return FAIL;
}
}
#endif
if (!recoverymode && !filtering)
filemess(curbuf, fname, (char_u *)""); /* show that we are busy */
msg_scroll = FALSE; /* overwrite the file message */
/*
* Set textmode and linecnt now, before the "retry" caused by 'textauto'
* and after the autocommands, which may change them.
*/
textmode = curbuf->b_p_tx;
linecnt = curbuf->b_ml.ml_line_count;
retry:
while (!error && !got_int)
{
/*
* We allocate as much space for the file as we can get, plus
* space for the old line plus room for one terminating NUL.
* The amount is limited by the fact that read() only can read
* upto max_unsigned characters (and other things).
*/
#if SIZEOF_INT <= 2
if (linerest >= 0x7ff0)
{
++split;
*ptr = NL; /* split line by inserting a NL */
size = 1;
}
else
#endif
{
#if SIZEOF_INT > 2
size = 0x10000L; /* use buffer >= 64K */
#else
size = 0x7ff0L - linerest; /* limit buffer to 32K */
#endif
for ( ; size >= 10; size >>= 1)
{
if ((new_buffer = lalloc((long_u)(size + linerest + 1), FALSE)) != NULL)
break;
}
if (new_buffer == NULL)
{
do_outofmem_msg();
error = TRUE;
break;
}
if (linerest) /* copy characters from the previous buffer */
vim_memmove(new_buffer, ptr - linerest, (size_t)linerest);
vim_free(buffer);
buffer = new_buffer;
ptr = buffer + linerest;
line_start = buffer;
if ((size = read(fd, (char *)ptr, (size_t)size)) <= 0)
{
if (size < 0) /* read error */
error = TRUE;
break;
}
filesize += size; /* count the number of characters */
/*
* when reading the first part of a file: guess EOL type
*/
if (firstpart && p_ta)
{
for (p = ptr; p < ptr + size; ++p)
if (*p == NL)
{
if (p > ptr && p[-1] == CR) /* found CR-NL */
textmode = TRUE;
else /* found a single NL */
textmode = FALSE;
/* if editing a new file: may set p_tx */
if (newfile)
curbuf->b_p_tx = textmode;
break;
}
}
}
firstpart = FALSE;
/*
* This loop is executed once for every character read.
* Keep it fast!
*/
--ptr;
while (++ptr, --size >= 0)
{
if ((c = *ptr) != NUL && c != NL) /* catch most common case */
continue;
if (c == NUL)
*ptr = NL; /* NULs are replaced by newlines! */
else
{
if (skip_count == 0)
{
*ptr = NUL; /* end of line */
len = ptr - line_start + 1;
if (textmode)
{
if (ptr[-1] == CR) /* remove CR */
{
ptr[-1] = NUL;
--len;
}
/*
* Reading in textmode, but no CR-LF found!
* When 'textauto' set, delete all the lines read so
* far and start all over again.
* Otherwise give an error message later.
*/
else if (!tx_error)
{
if (p_ta && lseek(fd, 0L, SEEK_SET) == 0)
{
while (lnum > from)
ml_delete(lnum--, FALSE);
textmode = FALSE;
if (newfile)
curbuf->b_p_tx = FALSE;
linerest = 0;
filesize = 0;
skip_count = lines_to_skip;
read_count = lines_to_read;
goto retry;
}
else
tx_error = TRUE;
}
}
if (ml_append(lnum, line_start, len, newfile) == FAIL)
{
error = TRUE;
break;
}
++lnum;
if (--read_count == 0)
{
error = TRUE; /* break loop */
line_start = ptr; /* nothing left to write */
break;
}
}
else
--skip_count;
line_start = ptr + 1;
}
}
linerest = ptr - line_start;
mch_breakcheck();
}
/* not an error, max. number of lines reached */
if (error && read_count == 0)
error = FALSE;
/*
* If we get EOF in the middle of a line, note the fact and
* complete the line ourselves.
* In textmode ignore a trailing CTRL-Z, unless 'binary' set.
*/
if (!error && !got_int && linerest != 0 &&
!(!curbuf->b_p_bin && textmode &&
*line_start == Ctrl('Z') && ptr == line_start + 1))
{
if (newfile) /* remember for when writing */
curbuf->b_p_eol = FALSE;
*ptr = NUL;
if (ml_append(lnum, line_start,
(colnr_t)(ptr - line_start + 1), newfile) == FAIL)
error = TRUE;
else
read_no_eol_lnum = ++lnum;
}
if (lnum != from && !newfile) /* added at least one line */
CHANGED;
close(fd); /* errors are ignored */
vim_free(buffer);
--no_wait_return; /* may wait for return now */
/* in recovery mode everything but autocommands are skipped */
if (!recoverymode)
{
/* need to delete the last line, which comes from the empty buffer */
if (newfile && !(curbuf->b_ml.ml_flags & ML_EMPTY))
{
ml_delete(curbuf->b_ml.ml_line_count, FALSE);
--linecnt;
}
linecnt = curbuf->b_ml.ml_line_count - linecnt;
if (filesize == 0)
linecnt = 0;
if (!newfile)
mark_adjust(from + 1, MAXLNUM, (long)linecnt, 0L);
if (got_int)
{
filemess(curbuf, fname, e_interr);
msg_scroll = msg_save;
#ifdef VIMINFO
check_marks_read();
#endif /* VIMINFO */
return OK; /* an interrupt isn't really an error */
}
if (!filtering)
{
msg_add_fname(curbuf, fname); /* fname in IObuff with quotes */
c = FALSE;
#ifdef UNIX
# ifdef S_ISFIFO
if (S_ISFIFO(perm)) /* fifo or socket */
{
STRCAT(IObuff, "[fifo/socket]");
c = TRUE;
}
# else
# ifdef S_IFIFO
if ((perm & S_IFMT) == S_IFIFO) /* fifo */
{
STRCAT(IObuff, "[fifo]");
c = TRUE;
}
# endif
# ifdef S_IFSOCK
if ((perm & S_IFMT) == S_IFSOCK) /* or socket */
{
STRCAT(IObuff, "[socket]");
c = TRUE;
}
# endif
# endif
#endif
if (curbuf->b_p_ro)
{
STRCAT(IObuff, shortmess(SHM_RO) ? "[RO]" : "[readonly]");
c = TRUE;
}
if (read_no_eol_lnum)
{
msg_add_eol();
c = TRUE;
}
if (tx_error)
{
STRCAT(IObuff, "[CR missing]");
c = TRUE;
}
if (split)
{
STRCAT(IObuff, "[long lines split]");
c = TRUE;
}
if (error)
{
STRCAT(IObuff, "[READ ERRORS]");
c = TRUE;
}
if (msg_add_textmode(textmode))
c = TRUE;
msg_add_lines(c, (long)linecnt, filesize);
msg_trunc(IObuff);
}
if (error && newfile) /* with errors we should not write the file */
curbuf->b_p_ro = TRUE;
u_clearline(); /* cannot use "U" command after adding lines */
if (from < curbuf->b_ml.ml_line_count)
{
curwin->w_cursor.lnum = from + 1; /* cursor at first new line */
beginline(TRUE); /* on first non-blank */
}
/*
* Set '[ and '] marks to the newly read lines.
*/
curbuf->b_op_start.lnum = from + 1;
curbuf->b_op_start.col = 0;
curbuf->b_op_end.lnum = from + linecnt;
curbuf->b_op_end.col = 0;
}
msg_scroll = msg_save;
#ifdef AUTOCMD
{
int m = msg_scroll;
int n = msg_scrolled;
/*
* Trick: We remember if the last line of the read didn't have
* an eol for when writing it again. This is required for
* ":autocmd FileReadPost *.gz set bin|'[,']!gunzip" to work.
*/
write_no_eol_lnum = read_no_eol_lnum;
/*
* The output from the autocommands should not overwrite anything and
* should not be overwritten: Set msg_scroll, restore its value if no
* output was done.
*/
msg_scroll = TRUE;
if (filtering)
apply_autocmds(EVENT_FILTERREADPOST, NULL, fname);
else if (newfile)
apply_autocmds(EVENT_BUFREADPOST, NULL, fname);
else
apply_autocmds(EVENT_FILEREADPOST, fname, fname);
if (msg_scrolled == n)
msg_scroll = m;
}
#endif
#ifdef VIMINFO
check_marks_read();
#endif /* VIMINFO */
if (recoverymode && error)
return FAIL;
return OK;
}
#ifdef VIMINFO
static void
check_marks_read()
{
if (!curbuf->b_marks_read && get_viminfo_parameter('\'') > 0)
{
read_viminfo(NULL, FALSE, TRUE, FALSE);
curbuf->b_marks_read = TRUE;
}
}
#endif /* VIMINFO */
/*
* 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 (jw).
* In case of an error everything possible is done to restore the original file.
* But when forceit is TRUE, we risk loosing it.
* When reset_changed is TRUE 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, fname, sfname, start, end, append, forceit,
reset_changed, filtering)
BUF *buf;
char_u *fname;
char_u *sfname;
linenr_t start, end;
int append;
int forceit;
int reset_changed;
int filtering;
{
int fd;
char_u *backup = NULL;
char_u *ffname;
#ifdef AUTOCMD
BUF *save_buf;
#endif
register char_u *s;
register char_u *ptr;
register char_u c;
register int len;
register linenr_t lnum;
long nchars;
char_u *errmsg = NULL;
char_u *buffer;
char_u smallbuf[SBUFSIZE];
char_u *backup_ext;
int bufsize;
long perm = -1; /* 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 */
#if defined(UNIX) || defined(__EMX__XX) /*XXX fix me sometime? */
struct stat st_old;
int made_writable = FALSE; /* 'w' bit has been set */
#endif
#ifdef AMIGA
BPTR flock;
#endif
/* writing everything */
int whole = (start == 1 && end == buf->b_ml.ml_line_count);
#ifdef AUTOCMD
linenr_t old_line_count = buf->b_ml.ml_line_count;
#endif
if (fname == NULL || *fname == NUL) /* safety check */
return FAIL;
/*
* If there is no file name yet, use the one for the written file.
* b_notedited is set to reflect this (in case the write fails).
* Don't do this when the write is for a filter command.
* Only do this when 'cpoptions' contains the 'f' flag.
*/
if (reset_changed && whole && buf == curbuf &&
curbuf->b_filename == NULL && !filtering &&
vim_strchr(p_cpo, CPO_FNAMEW) != NULL)
{
if (setfname(fname, sfname, FALSE) == OK)
curbuf->b_notedited = TRUE;
}
if (sfname == NULL)
sfname = fname;
/*
* For Unix: Use the short filename 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
if (!did_cd)
fname = sfname;
#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 (buf->b_filename != NULL && fnamecmp(ffname, buf->b_filename) == 0)
overwriting = TRUE;
else
overwriting = FALSE;
/*
* Disallow writing from .exrc and .vimrc in current directory for
* security reasons.
*/
if (secure)
{
secure = 2;
emsg(e_curdir);
return FAIL;
}
if (exiting)
settmode(0); /* when exiting allow typahead 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;
#ifdef AUTOCMD
/*
* Apply PRE aucocommands.
* Set curbuf to the buffer to be written.
* Careful: The autocommands may call buf_write() recursively!
*/
save_buf = curbuf;
curbuf = buf;
curwin->w_buffer = buf;
if (append)
apply_autocmds(EVENT_FILEAPPENDPRE, fname, fname);
else if (filtering)
apply_autocmds(EVENT_FILTERWRITEPRE, NULL, fname);
else if (reset_changed && whole)
apply_autocmds(EVENT_BUFWRITEPRE, fname, fname);
else
apply_autocmds(EVENT_FILEWRITEPRE, fname, fname);
/*
* If the autocommands deleted or unloaded the buffer, give an error
* message.
*/
if (!buf_valid(buf) || buf->b_ml.ml_mfp == NULL)
{
--no_wait_return;
msg_scroll = msg_save;
EMSG("Autocommands deleted or unloaded buffer to be written");
return FAIL;
}
/*
* If the autocommands didn't change the current buffer, go back to the
* original current buffer, if it still exists.
*/
if (curbuf == buf && buf_valid(save_buf))
{
curbuf = save_buf;
curwin->w_buffer = save_buf;
}
/*
* 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) /* writing 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("Autocommand changed number of lines in unexpected way");
return FAIL;
}
}
}
#endif
if (shortmess(SHM_OVER))
msg_scroll = FALSE; /* overwrite previous file message */
else
msg_scroll = TRUE; /* don't overwrite previous file message */
if (!filtering)
filemess(buf,
#ifndef UNIX
did_cd ? fname : sfname,
#else
fname,
#endif
(char_u *)""); /* 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 = SBUFSIZE;
}
else
bufsize = BUFSIZE;
#if defined(UNIX) && !defined(ARCHIE)
/* get information about original file (if there is one) */
st_old.st_dev = st_old.st_ino = 0;
if (stat((char *)fname, &st_old))
newfile = TRUE;
else
{
#ifdef _POSIX_SOURCE
if (!S_ISREG(st_old.st_mode)) /* not a file */
#else
if ((st_old.st_mode & S_IFMT) != S_IFREG) /* not a file */
#endif
{
#ifdef _POSIX_SOURCE
if (S_ISDIR(st_old.st_mode))
#else
if ((st_old.st_mode & S_IFMT) == S_IFDIR)
#endif
errmsg = (char_u *)"is a directory";
else
errmsg = (char_u *)"is not a file";
goto fail;
}
if (buf->b_mtime_read != 0 &&
buf->b_mtime_read != st_old.st_mtime && overwriting)
{
msg_scroll = TRUE; /* don't overwrite messages here */
(void)set_highlight('e'); /* set highlight for error messages */
msg_highlight = TRUE;
/* don't use emsg() here, don't want to flush the buffers */
MSG("WARNING: The file has been changed since reading it!!!");
if (ask_yesno((char_u *)"Do you really want to write to it",
TRUE) == 'n')
{
retval = FAIL;
goto fail;
}
msg_scroll = FALSE; /* always overwrite the file message now */
}
perm = st_old.st_mode;
}
/*
* If we are not appending, the file exists, and the 'writebackup', 'backup'
* or 'patchmode' option is set, try to make a backup copy of the file.
*/
if (!append && perm >= 0 && (p_wb || p_bk || *p_pm != NUL) &&
(fd = open((char *)fname, O_RDONLY | O_EXTRA)) >= 0)
{
int bfd, buflen;
char_u copybuf[BUFSIZE + 1], *wp;
int some_error = FALSE;
struct stat st_new;
char_u *dirp;
char_u *rootname;
#ifndef SHORT_FNAME
int did_set_shortname;
#endif
/*
* 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)
{
st_new.st_dev = st_new.st_ino = 0;
st_new.st_gid = 0;
/*
* Isolate one directory name, using an entry in 'bdir'.
*/
(void)copy_option_part(&dirp, copybuf, BUFSIZE, ",");
rootname = get_file_in_dir(fname, copybuf);
if (rootname == NULL)
{
some_error = TRUE; /* out of memory */
goto nobackup;
}
#ifndef SHORT_FNAME
did_set_shortname = FALSE;
#endif
/*
* May try twice if 'shortname' not set.
*/
for (;;)
{
/*
* Make backup file name.
*/
backup = buf_modname(buf, rootname, backup_ext);
if (backup == NULL)
{
some_error = TRUE; /* out of memory */
vim_free(rootname);
goto nobackup;
}
/*
* Check if backup file already exists.
*/
if (!stat((char *)backup, &st_new))
{
/*
* Check if backup file is same as original file.
* May happen when modname gave the same file back.
* E.g. silly link, or filename-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_free(backup);
backup = NULL; /* there is no backup file to delete */
#ifndef SHORT_FNAME
/*
* 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;
#endif
break;
}
/*
* 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' && !stat((char *)backup, &st_new))
--*wp;
/* They all exist??? Must be something wrong. */
if (*wp == 'a')
{
vim_free(backup);
backup = NULL;
}
}
}
break;
}
vim_free(rootname);
/*
* Try to create the backup file
*/
if (backup != NULL)
{
/* remove old backup, if present */
vim_remove(backup);
bfd = open((char *)backup, O_WRONLY | O_CREAT | O_EXTRA, 0666);
if (bfd < 0)
{
vim_free(backup);
backup = NULL;
}
else
{
/* set file protection same as original file, but strip
* s-bit */
(void)setperm(backup, perm & 0777);
/*
* 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, -1, st_old.st_gid) != 0)
#else
chown(backup, -1, st_old.st_gid) != 0)
#endif
setperm(backup, (perm & 0707) | ((perm & 07) << 3));
/* copy the file. */
while ((buflen = read(fd, (char *)copybuf, BUFSIZE)) > 0)
{
if (write_buf(bfd, copybuf, buflen) == FAIL)
{
errmsg = (char_u *)"Can't write to backup file (use ! to override)";
break;
}
}
if (close(bfd) < 0 && errmsg == NULL)
errmsg = (char_u *)"Close error for backup file (use ! to override)";
if (buflen < 0)
errmsg = (char_u *)"Can't read file for backup (use ! to override)";
break;
}
}
}
nobackup:
close(fd); /* ignore errors for closing read file */
if (backup == NULL && errmsg == NULL)
errmsg = (char_u *)"Cannot create backup file (use ! to override)";
/* ignore errors when forceit is TRUE */
if ((some_error || errmsg) && !forceit)
{
retval = FAIL;
goto fail;
}
errmsg = NULL;
}
/* When using ":w!" and the file was read-only: make it writable */
if (forceit && (st_old.st_uid == getuid()) && perm >= 0 && !(perm & 0200))
{
perm |= 0200;
(void)setperm(fname, perm);
made_writable = TRUE;
}
#else /* end of UNIX, start of the rest */
/*
* If we are not appending, the file exists, and the 'writebackup' or
* 'backup' option is set, make a backup.
* Do not make any backup, if "writebackup" and "backup" are
* both switched off. This helps when editing large files on
* almost-full disks. (jw)
*/
perm = getperm(fname);
if (perm < 0)
newfile = TRUE;
else if (mch_isdir(fname))
{
errmsg = (char_u *)"is a directory";
goto fail;
}
if (!append && perm >= 0 && (p_wb || p_bk || *p_pm != NUL))
{
char_u *dirp;
char_u *p;
char_u *rootname;
/*
* 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, ",");
rootname = get_file_in_dir(fname, IObuff);
if (rootname == NULL)
backup = NULL;
else
{
backup = buf_modname(buf, rootname, backup_ext);
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 && getperm(backup) >= 0)
{
p = backup + STRLEN(backup) - 1 - STRLEN(backup_ext);
if (p < backup) /* empty file name ??? */
p = backup;
*p = 'z';
while (*p > 'a' && getperm(backup) >= 0)
--*p;
/* They all exist??? Must be something wrong! */
if (*p == 'a')
{
vim_free(backup);
backup = NULL;
}
}
}
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.
*/
#ifdef AMIGA
/*
* With MSDOS-compatible filesystems (crossdos, messydos) it is
* possible that the name of the backup file is the same as the
* original file. To avoid the chance of accidently deleting the
* original file (horror!) we lock it during the remove.
* This should not happen with ":w", because startscript()
* should detect this problem and set buf->b_shortname,
* causing modname to return a correct ".bak" filename. This
* problem does exist with ":w filename", but then the
* original file will be somewhere else so the backup isn't
* really important. If autoscripting is off the rename may
* fail.
*/
flock = Lock((UBYTE *)fname, (long)ACCESS_READ);
#endif
vim_remove(backup);
#ifdef AMIGA
if (flock)
UnLock(flock);
#endif
/*
* If the renaming of the original file to the backup file
* works, quit here.
*/
if (vim_rename(fname, backup) == 0)
break;
vim_free(backup); /* don't do the rename below */
backup = NULL;
}
}
if (backup == NULL && !forceit)
{
errmsg = (char_u *)"Can't make backup file (use ! to override)";
goto fail;
}
}
#endif /* UNIX */
/* When using ":w!" and writing to the current file, readonly makes no
* sense, reset it */
if (forceit && overwriting)
buf->b_p_ro = FALSE;
/*
* 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 && !otherfile(ffname) &&
!(exiting && backup != NULL))
ml_preserve(buf, FALSE);
/*
* 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 = open((char *)fname, O_WRONLY | O_EXTRA | (append ?
(forceit ? (O_APPEND | O_CREAT) : O_APPEND) :
(O_CREAT | O_TRUNC)), 0666)) < 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 vim_remove() will fail.
*/
if (!errmsg)
{
errmsg = (char_u *)"Can't open file for writing";
if (forceit)
{
#ifdef UNIX
/* we write to the file, thus it should be marked
writable after all */
perm |= 0200;
made_writable = TRUE;
if (st_old.st_uid != getuid() || st_old.st_gid != getgid())
perm &= 0777;
#endif /* UNIX */
if (!append) /* don't remove when appending */
vim_remove(fname);
continue;
}
}
/*
* 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)
{
#ifdef UNIX
struct stat st;
/*
* 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.
*/
/* file does not exist */
if (stat((char *)fname, &st) < 0)
/* put the copy in its place */
vim_rename(backup, fname);
/* original file does exist */
if (stat((char *)fname, &st) >= 0)
vim_remove(backup); /* throw away the copy */
#else
/* try to put the original file back */
vim_rename(backup, fname);
#endif
}
goto fail;
}
errmsg = NULL;
if (end > buf->b_ml.ml_line_count)
end = buf->b_ml.ml_line_count;
len = 0;
s = buffer;
nchars = 0;
if (buf->b_ml.ml_flags & ML_EMPTY)
start = end + 1;
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;
while ((c = *++ptr) != NUL)
{
if (c == NL)
*s = NUL; /* replace newlines with NULs */
else
*s = c;
++s;
if (++len != bufsize)
continue;
if (write_buf(fd, buffer, bufsize) == FAIL)
{
end = 0; /* write error: break loop */
break;
}
nchars += bufsize;
s = buffer;
len = 0;
}
/* write failed or last line has no EOL: stop here */
if (end == 0 || (lnum == end && buf->b_p_bin &&
(lnum == write_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 (buf->b_p_tx) /* write CR-NL */
{
*s = CR;
++s;
if (++len == bufsize)
{
if (write_buf(fd, buffer, bufsize) == FAIL)
{
end = 0; /* write error: break loop */
break;
}
nchars += bufsize;
s = buffer;
len = 0;
}
}
*s = NL;
++s;
if (++len == bufsize && end)
{
if (write_buf(fd, buffer, bufsize) == FAIL)
{
end = 0; /* write error: break loop */
break;
}
nchars += bufsize;
s = buffer;
len = 0;
}
}
if (len && end)
{
if (write_buf(fd, buffer, len) == FAIL)
end = 0; /* write error */
nchars += len;
}
if (close(fd) != 0)
{
errmsg = (char_u *)"Close failed";
goto fail;
}
#ifdef UNIX
if (made_writable)
perm &= ~0200; /* reset 'w' bit for security reasons */
#endif
if (perm >= 0)
(void)setperm(fname, perm); /* set permissions of new file same as old file */
if (end == 0)
{
errmsg = (char_u *)"write error (file system full?)";
/*
* If we have a backup file, try to put it in place of the new file,
* because it is probably corrupt. This avoids loosing the original
* file when trying to make a backup when writing the file a second
* time.
* For unix this means copying the backup over the new file.
* For others this means renaming the backup file.
* If this is OK, don't give the extra warning message.
*/
if (backup != NULL)
{
#ifdef UNIX
char_u copybuf[BUFSIZE + 1];
int bfd, buflen;
if ((bfd = open((char *)backup, O_RDONLY | O_EXTRA)) >= 0)
{
if ((fd = open((char *)fname,
O_WRONLY | O_CREAT | O_TRUNC | O_EXTRA, 0666)) >= 0)
{
/* copy the file. */
while ((buflen = read(bfd, (char *)copybuf, BUFSIZE)) > 0)
if (write_buf(fd, copybuf, buflen) == FAIL)
break;
if (close(fd) >= 0 && buflen == 0) /* success */
end = 1;
}
close(bfd); /* ignore errors for closing read file */
}
#else
if (vim_rename(backup, fname) == 0)
end = 1;
#endif
}
goto fail;
}
lnum -= start; /* compute number of written lines */
--no_wait_return; /* may wait for return now */
#ifndef UNIX
/* use shortname now, for the messages */
if (!did_cd)
fname = sfname;
#endif
if (!filtering)
{
msg_add_fname(buf, fname); /* put fname in IObuff with quotes */
c = FALSE;
if (newfile)
{
STRCAT(IObuff, shortmess(SHM_NEW) ? "[New]" : "[New File]");
c = TRUE;
}
if (no_eol)
{
msg_add_eol();
c = TRUE;
}
if (msg_add_textmode(buf->b_p_tx)) /* may add [textmode] */
c = TRUE;
msg_add_lines(c, (long)lnum, nchars); /* add line/char count */
if (!shortmess(SHM_WRITE))
STRCAT(IObuff, shortmess(SHM_WRI) ? " [w]" : " written");
msg_trunc(IObuff);
}
if (reset_changed && whole) /* when written everything */
{
UNCHANGED(buf);
u_unchanged(buf);
}
/*
* If written to the current file, update the timestamp of the swap file
* and reset the 'notedited' flag. Also sets buf->b_mtime.
*/
if (!exiting && overwriting)
{
ml_timestamp(buf);
buf->b_notedited = FALSE;
}
/*
* 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)
{
char *org = (char *)buf_modname(buf, fname, p_pm);
if (backup != NULL)
{
struct stat st;
/*
* If the original file does not exist yet
* the current backup file becomes the original file
*/
if (org == NULL)
EMSG("patchmode: can't save original file");
else if (stat(org, &st) < 0)
{
vim_rename(backup, (char_u *)org);
vim_free(backup); /* don't delete the file */
backup = NULL;
}
}
/*
* If there is no backup file, remember that a (new) file was
* created.
*/
else
{
int empty_fd;
if (org == NULL || (empty_fd =
open(org, O_CREAT | O_EXTRA, 0666)) < 0)
EMSG("patchmode: can't touch empty original file");
else
close(empty_fd);
}
if (org != NULL)
{
setperm((char_u *)org, getperm(fname) & 0777);
vim_free(org);
}
}
/*
* Remove the backup unless 'backup' option is set
*/
if (!p_bk && backup != NULL && vim_remove(backup) != 0)
EMSG("Can't delete backup file");
goto nofail;
fail:
--no_wait_return; /* may wait for return now */
nofail:
vim_free(backup);
if (buffer != smallbuf)
vim_free(buffer);
if (errmsg != NULL)
{
/* can't use emsg() here, do something alike */
if (p_eb)
beep_flush(); /* also includes flush_buffers() */
else
flush_buffers(FALSE); /* flush internal buffers */
(void)set_highlight('e'); /* set highlight mode for error messages */
start_highlight();
filemess(buf,
#ifndef UNIX
did_cd ? fname : sfname,
#else
fname,
#endif
errmsg);
retval = FAIL;
if (end == 0)
{
MSG_OUTSTR("\nWARNING: Original file may be lost or damaged\n");
MSG_OUTSTR("don't quit the editor until the file is successfully written!");
}
}
msg_scroll = msg_save;
#ifdef AUTOCMD
write_no_eol_lnum = 0; /* in case it was set by the previous read */
/*
* Apply POST autocommands.
* Careful: The autocommands may call buf_write() recursively!
*/
save_buf = curbuf;
curbuf = buf;
curwin->w_buffer = buf;
if (append)
apply_autocmds(EVENT_FILEAPPENDPOST, fname, fname);
else if (filtering)
apply_autocmds(EVENT_FILTERWRITEPOST, NULL, fname);
else if (reset_changed && whole)
apply_autocmds(EVENT_BUFWRITEPOST, fname, fname);
else
apply_autocmds(EVENT_FILEWRITEPOST, fname, fname);
/*
* If the autocommands didn't change the current buffer, go back to the
* original current buffer, if it still exists.
*/
if (curbuf == buf && buf_valid(save_buf))
{
curbuf = save_buf;
curwin->w_buffer = save_buf;
}
#endif
return retval;
}
/*
* Put file name into IObuff with quotes.
*/
static void
msg_add_fname(buf, fname)
BUF *buf;
char_u *fname;
{
/* careful: home_replace calls vim_getenv(), which also uses IObuff! */
home_replace(buf, fname, IObuff + 1, IOSIZE - 1);
IObuff[0] = '"';
STRCAT(IObuff, "\" ");
}
/*
* Append message for text mode to IObuff.
* Return TRUE if something appended.
*/
static int
msg_add_textmode(textmode)
int textmode;
{
#ifdef USE_CRNL
if (!textmode)
{
STRCAT(IObuff, shortmess(SHM_TEXT) ? "[notx]" : "[notextmode]");
return TRUE;
}
#else
if (textmode)
{
STRCAT(IObuff, shortmess(SHM_TEXT) ? "[tx]" : "[textmode]");
return TRUE;
}
#endif
return FALSE;
}
/*
* Append line and character count to IObuff.
*/
static void
msg_add_lines(insert_space, lnum, nchars)
int insert_space;
long lnum;
long nchars;
{
char_u *p;
p = IObuff + STRLEN(IObuff);
if (insert_space)
*p++ = ' ';
if (shortmess(SHM_LINES))
sprintf((char *)p, "%ldL, %ldC", lnum, nchars);
else
sprintf((char *)p, "%ld line%s, %ld character%s",
lnum, plural(lnum),
nchars, plural(nchars));
}
/*
* Append message for missing line separator to IObuff.
*/
static void
msg_add_eol()
{
STRCAT(IObuff, shortmess(SHM_LAST) ? "[noeol]" : "[Incomplete last line]");
}
/*
* write_buf: call write() to write a buffer
*
* return FAIL for failure, OK otherwise
*/
static int
write_buf(fd, buf, len)
int fd;
char_u *buf;
int len;
{
int wlen;
while (len)
{
wlen = write(fd, (char *)buf, (size_t)len);
if (wlen <= 0) /* error! */
return FAIL;
len -= wlen;
buf += wlen;
}
return OK;
}
/*
* add extention to filename - change path/fo.o.h to path/fo.o.h.ext or
* fo_o_h.ext for MSDOS or when shortname option set.
*
* Assumed that fname is a valid name found in the filesystem we assure that
* the return value is a different name and ends in 'ext'.
* "ext" MUST be at most 4 characters long if it starts with a dot, 3
* characters otherwise.
* Space for the returned name is allocated, must be freed later.
*/
char_u *
modname(fname, ext)
char_u *fname, *ext;
{
return buf_modname(curbuf, fname, ext);
}
char_u *
buf_modname(buf, fname, ext)
BUF *buf;
char_u *fname, *ext;
{
char_u *retval;
register char_u *s;
register char_u *e;
register char_u *ptr;
register int fnamelen, extlen;
extlen = STRLEN(ext);
/*
* if there is no filename we must get the name of the current directory
* (we need the full path in case :cd is used)
*/
if (fname == NULL || *fname == NUL)
{
retval = alloc((unsigned)(MAXPATHL + extlen + 3));
if (retval == NULL)
return NULL;
if (mch_dirname(retval, MAXPATHL) == FAIL ||
(fnamelen = STRLEN(retval)) == 0)
{
vim_free(retval);
return NULL;
}
if (!ispathsep(retval[fnamelen - 1]))
{
retval[fnamelen++] = PATHSEP;
retval[fnamelen] = NUL;
}
}
else
{
fnamelen = STRLEN(fname);
retval = alloc((unsigned)(fnamelen + extlen + 2));
if (retval == NULL)
return NULL;
STRCPY(retval, fname);
}
/*
* search backwards until we hit a '/', '\' or ':' replacing all '.'
* by '_' for MSDOS or when shortname option set and ext starts with a dot.
* Then truncate what is after the '/', '\' or ':' to 8 characters for
* MSDOS and 26 characters for AMIGA, a lot more for UNIX.
*/
for (ptr = retval + fnamelen; ptr >= retval; ptr--)
{
if (*ext == '.'
#ifdef USE_LONG_FNAME
&& (!USE_LONG_FNAME || buf->b_p_sn || buf->b_shortname)
#else
# ifndef SHORT_FNAME
&& (buf->b_p_sn || buf->b_shortname)
# endif
#endif
)
if (*ptr == '.') /* replace '.' by '_' */
*ptr = '_';
if (ispathsep(*ptr))
break;
}
ptr++;
/* the filename has at most BASENAMELEN characters. */
#ifndef SHORT_FNAME
if (STRLEN(ptr) > (unsigned)BASENAMELEN)
ptr[BASENAMELEN] = '\0';
#endif
s = ptr + STRLEN(ptr);
/*
* For 8.3 filenames we may have to reduce the length.
*/
#ifdef USE_LONG_FNAME
if (!USE_LONG_FNAME || buf->b_p_sn || buf->b_shortname)
#else
# ifndef SHORT_FNAME
if (buf->b_p_sn || buf->b_shortname)
# endif
#endif
{
/*
* If there is no file name, and the extension starts with '.', put a
* '_' before the dot, because just ".ext" is invalid.
*/
if (fname == NULL || *fname == NUL)
{
if (*ext == '.')
*s++ = '_';
}
/*
* If the extension starts with '.', truncate the base name at 8
* characters
*/
else if (*ext == '.')
{
if (s - ptr > (size_t)8)
{
s = ptr + 8;
*s = '\0';
}
}
/*
* If the extension doesn't start with '.', and the file name
* doesn't have an extension yet, append a '.'
*/
else if ((e = vim_strchr(ptr, '.')) == NULL)
*s++ = '.';
/*
* If If the extension doesn't start with '.', and there already is an
* extension, it may need to be tructated
*/
else if ((int)STRLEN(e) + extlen > 4)
s = e + 4 - extlen;
}
#ifdef OS2
/*
* If there is no file name, and the extension starts with '.', put a
* '_' before the dot, because just ".ext" may be invalid if it's on a
* FAT partition, and on HPFS it doesn't matter.
*/
else if ((fname == NULL || *fname == NUL) && *ext == '.')
*s++ = '_';
#endif
/*
* Append the extention.
* ext can start with '.' and cannot exceed 3 more characters.
*/
STRCPY(s, ext);
/*
* Check that, after appending the extension, the file name is really
* different.
*/
if (fname != NULL && STRCMP(fname, retval) == 0)
{
/* we search for a character that can be replaced by '_' */
while (--s >= ptr)
{
if (*s != '_')
{
*s = '_';
break;
}
}
if (s < ptr) /* fname was "________.<ext>" how tricky! */
*ptr = 'v';
}
return retval;
}
/* vim_fgets();
*
* Like fgets(), but if the file line is too long, it is truncated and the
* rest of the line is thrown away. Returns TRUE for end-of-file.
* Note: do not pass IObuff as the buffer since this is used to read and
* discard the extra part of any long lines.
*/
int
vim_fgets(buf, size, fp)
char_u *buf;
int size;
FILE *fp;
{
char *eof;
buf[size - 2] = NUL;
eof = fgets((char *)buf, size, fp);
if (buf[size - 2] != NUL && buf[size - 2] != '\n')
{
buf[size - 1] = NUL; /* Truncate the line */
/* Now throw away the rest of the line: */
do
{
IObuff[IOSIZE - 2] = NUL;
fgets((char *)IObuff, IOSIZE, fp);
} while (IObuff[IOSIZE - 2] != NUL && IObuff[IOSIZE - 2] != '\n');
}
return (eof == NULL);
}
/*
* rename() only works if both files are on the same file system, this
* function will (attempts to?) copy the file across if rename fails -- webb
* Return -1 for failure, 0 for success.
*/
int
vim_rename(from, to)
char_u *from;
char_u *to;
{
int fd_in;
int fd_out;
int n;
char *errmsg = NULL;
/*
* First delete the "to" file, this is required on some systems to make
* the rename() work, on other systems it makes sure that we don't have
* two files when the rename() fails.
*/
vim_remove(to);
/*
* First try a normal rename, return if it works.
*/
if (rename((char *)from, (char *)to) == 0)
return 0;
/*
* Rename() failed, try copying the file.
*/
fd_in = open((char *)from, O_RDONLY | O_EXTRA);
if (fd_in == -1)
return -1;
fd_out = open((char *)to, O_CREAT | O_TRUNC | O_WRONLY | O_EXTRA, 0666);
if (fd_out == -1)
{
close(fd_in);
return -1;
}
while ((n = read(fd_in, (char *)IObuff, (size_t)IOSIZE)) > 0)
if (write(fd_out, (char *)IObuff, (size_t)n) != n)
{
errmsg = "writing to";
break;
}
close(fd_in);
if (close(fd_out) < 0)
errmsg = "closing";
if (n < 0)
{
errmsg = "reading";
to = from;
}
if (errmsg != NULL)
{
sprintf((char *)IObuff, "Error %s '%s'", errmsg, to);
emsg(IObuff);
return -1;
}
vim_remove(from);
return 0;
}
/*
* Check if any not hidden buffer has been changed.
* Postpone the check if there are characters in the stuff buffer, a global
* command is being executed, a mapping is being executed or an autocommand is
* busy.
*/
void
check_timestamps()
{
BUF *buf;
if (!stuff_empty() || global_busy || !typebuf_typed()
#ifdef AUTOCMD
|| autocmd_busy
#endif
)
need_check_timestamps = TRUE; /* check later */
else
{
++no_wait_return;
for (buf = firstbuf; buf != NULL; buf = buf->b_next)
buf_check_timestamp(buf);
--no_wait_return;
need_check_timestamps = FALSE;
}
}
/*
* Check if buffer "buf" has been changed.
*/
void
buf_check_timestamp(buf)
BUF *buf;
{
struct stat st;
char_u *path;
if ( buf->b_filename != NULL &&
buf->b_ml.ml_mfp != NULL &&
!buf->b_notedited &&
buf->b_mtime != 0 &&
stat((char *)buf->b_filename, &st) >= 0 &&
buf->b_mtime != st.st_mtime)
{
path = home_replace_save(buf, buf->b_xfilename);
if (path != NULL)
{
EMSG2("Warning: File \"%s\" has changed since editing started",
path);
buf->b_mtime = st.st_mtime;
vim_free(path);
}
}
}
/*
* Adjust the line with missing eol, used for the next write.
* Used for do_filter(), when the input lines for the filter are deleted.
*/
void
write_lnum_adjust(offset)
linenr_t offset;
{
if (write_no_eol_lnum) /* only if there is a missing eol */
write_no_eol_lnum += offset;
}
#ifdef USE_TMPNAM
extern char *tmpnam __ARGS((char *));
#else
extern char *mktemp __ARGS((char *));
#endif
/*
* vim_tempname(): Return a unique name that can be used for a temp file.
*
* The temp file is NOT created.
*
* The returned pointer is to allocated memory.
* The returned pointer is NULL if no valid name was found.
*/
char_u *
vim_tempname(extra_char)
int extra_char; /* character to use in the name instead of '?' */
{
#ifdef USE_TMPNAM
char_u itmp[L_tmpnam]; /* use tmpnam() */
#else
char_u itmp[TEMPNAMELEN];
#endif
char_u *p;
#if defined(TEMPDIRNAMES)
static char *(tempdirs[]) = {TEMPDIRNAMES};
static int first_dir = 0;
int first_try = TRUE;
int i;
/*
* Try a few places to put the temp file.
* To avoid waisting time with non-existing environment variables and
* directories, they are skipped next time.
*/
for (i = first_dir; i < sizeof(tempdirs) / sizeof(char *); ++i)
{
/* expand $TMP, leave room for '/', "v?XXXXXX" and NUL */
expand_env((char_u *)tempdirs[i], itmp, TEMPNAMELEN - 10);
if (mch_isdir(itmp)) /* directory exists */
{
if (first_try)
first_dir = i; /* start here next time */
first_try = FALSE;
#ifdef BACKSLASH_IN_FILENAME
/*
* really want a backslash here, because the filename will
* probably be used in a command line
*/
STRCAT(itmp, "\\");
#else
STRCAT(itmp, PATHSEPSTR);
#endif
STRCAT(itmp, TEMPNAME);
if ((p = vim_strchr(itmp, '?')) != NULL)
*p = extra_char;
if (*mktemp((char *)itmp) == NUL)
continue;
return strsave(itmp);
}
}
return NULL;
#else
# ifndef USE_TMPNAM /* tmpnam() will make its own name */
STRCPY(itmp, TEMPNAME);
# endif
if ((p = vim_strchr(itmp, '?')) != NULL)
*p = extra_char;
# ifdef USE_TMPNAM
if (*tmpnam((char *)itmp) == NUL)
# else
if (*mktemp((char *)itmp) == NUL)
# endif
return NULL;
return strsave(itmp);
#endif
}
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