2 * Copyright (c) 1992, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
4 * Copyright (c) 1992, 1993, 1994, 1995, 1996
5 * Keith Bostic. All rights reserved.
7 * See the LICENSE file for redistribution information.
13 static const char sccsid
[] = "$Id: exf.c,v 10.64 2015/04/05 15:21:55 zy Exp $";
16 #include <sys/types.h>
17 #include <sys/queue.h>
22 * We include <sys/file.h>, because the flock(2) and open(2) #defines
23 * were found there on historical systems. We also include <fcntl.h>
24 * because the open(2) #defines are found there on newer systems.
28 #include <bitstring.h>
40 static int file_backup(SCR
*, char *, char *);
41 static void file_cinit(SCR
*);
42 static void file_encinit(SCR
*);
43 static void file_comment(SCR
*);
44 static int file_spath(SCR
*, FREF
*, struct stat
*, int *);
48 * Insert a file name into the FREF list, if it doesn't already
52 * The "if it doesn't already appear" changes vi's semantics slightly. If
53 * you do a "vi foo bar", and then execute "next bar baz", the edit of bar
54 * will reflect the line/column of the previous edit session. Historic nvi
55 * did not do this. The change is a logical extension of the change where
56 * vi now remembers the last location in any file that it has ever edited,
57 * not just the previously edited file.
59 * PUBLIC: FREF *file_add(SCR *, char *);
70 * Return it if it already exists. Note that we test against the
71 * user's name, whatever that happens to be, including if it's a
74 * If the user added a file but was unable to initialize it, there
75 * can be file list entries where the name field is NULL. Discard
76 * them the next time we see them.
80 TAILQ_FOREACH_MUTABLE(frp
, gp
->frefq
, q
, tfrp
) {
81 if (frp
->name
== NULL
) {
82 TAILQ_REMOVE(gp
->frefq
, frp
, q
);
83 if (frp
->name
!= NULL
)
88 if (!strcmp(frp
->name
, name
))
92 /* Allocate and initialize the FREF structure. */
93 CALLOC(sp
, frp
, FREF
*, 1, sizeof(FREF
));
98 * If no file name specified, or if the file name is a request
99 * for something temporary, file_init() will allocate the file
100 * name. Temporary files are always ignored.
102 if (name
!= NULL
&& strcmp(name
, TEMPORARY_FILE_STRING
) &&
103 (frp
->name
= strdup(name
)) == NULL
) {
105 msgq(sp
, M_SYSERR
, NULL
);
109 /* Append into the chain of file names. */
110 TAILQ_INSERT_TAIL(gp
->frefq
, frp
, q
);
117 * Start editing a file, based on the FREF structure. If successsful,
118 * let go of any previous file. Don't release the previous file until
119 * absolutely sure we have the new one.
121 * PUBLIC: int file_init(SCR *, FREF *, char *, int);
131 RECNOINFO oinfo
= { 0 };
134 int fd
, exists
, open_err
, readonly
;
137 open_err
= readonly
= 0;
140 * If the file is a recovery file, let the recovery code handle it.
141 * Clear the FR_RECOVER flag first -- the recovery code does set up,
142 * and then calls us! If the recovery call fails, it's probably
143 * because the named file doesn't exist. So, move boldly forward,
144 * presuming that there's an error message the user will get to see.
146 if (F_ISSET(frp
, FR_RECOVER
)) {
147 F_CLR(frp
, FR_RECOVER
);
148 return (rcv_read(sp
, frp
));
152 * Required FRP initialization; the only flag we keep is the
153 * cursor information.
155 F_CLR(frp
, ~FR_CURSORSET
);
158 * Required EXF initialization:
159 * Flush the line caches.
160 * Default recover mail file fd to -1.
161 * Set initial EXF flag bits.
163 CALLOC_RET(sp
, ep
, EXF
*, 1, sizeof(EXF
));
164 ep
->c_lno
= ep
->c_nlines
= OOBLNO
;
166 F_SET(ep
, F_FIRSTMODIFY
);
169 * Scan the user's path to find the file that we're going to
172 if (file_spath(sp
, frp
, &sb
, &exists
))
176 * If no name or backing file, for whatever reason, create a backing
177 * temporary file, saving the temp file name so we can later unlink
178 * it. If the user never named this file, copy the temporary file name
179 * to the real name (we display that until the user renames it).
182 if (LF_ISSET(FS_OPENERR
) || oname
== NULL
|| !exists
) {
185 if (opts_empty(sp
, O_TMPDIR
, 0))
188 join(O_STR(sp
, O_TMPDIR
), "vi.XXXXXXXXXX")) == NULL
) {
189 msgq(sp
, M_SYSERR
, NULL
);
192 if ((fd
= mkstemp(tname
)) == -1 || fstat(fd
, &sb
)) {
195 "237|Unable to create temporary file");
201 if (frp
->name
== NULL
) {
202 F_SET(frp
, FR_TMPFILE
);
203 if ((frp
->name
= strdup(tname
)) == NULL
) {
204 msgq(sp
, M_SYSERR
, NULL
);
210 if (!LF_ISSET(FS_OPENERR
))
211 F_SET(frp
, FR_NEWFILE
);
213 ep
->mtim
= sb
.st_mtimespec
;
217 * A seat of the pants calculation: try to keep the file in
218 * 15 pages or less. Don't use a page size larger than 16K
219 * (vi should have good locality) or smaller than 1K.
221 psize
= ((sb
.st_size
/ 15) + 1023) / 1024;
226 psize
= p2roundup(psize
) << 10;
229 ep
->mdev
= sb
.st_dev
;
230 ep
->minode
= sb
.st_ino
;
232 ep
->mtim
= sb
.st_mtimespec
;
234 if (!S_ISREG(sb
.st_mode
))
235 msgq_str(sp
, M_ERR
, oname
,
236 "238|Warning: %s is not a regular file");
239 /* Set up recovery. */
240 oinfo
.bval
= '\n'; /* Always set. */
242 oinfo
.flags
= F_ISSET(sp
->gp
, G_SNAPSHOT
) ? R_SNAPSHOT
: 0;
243 if (rcv_name
== NULL
) {
244 if (!rcv_tmp(sp
, ep
, frp
->name
))
245 oinfo
.bfname
= ep
->rcv_path
;
247 if ((ep
->rcv_path
= strdup(rcv_name
)) == NULL
) {
248 msgq(sp
, M_SYSERR
, NULL
);
251 oinfo
.bfname
= ep
->rcv_path
;
252 F_SET(ep
, F_MODIFIED
);
255 /* Open a db structure. */
256 if ((ep
->db
= dbopen(rcv_name
== NULL
? oname
: NULL
,
257 O_NONBLOCK
| O_RDONLY
,
258 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
,
259 DB_RECNO
, &oinfo
)) == NULL
) {
261 M_SYSERR
, rcv_name
== NULL
? oname
: rcv_name
, "%s");
262 if (F_ISSET(frp
, FR_NEWFILE
))
266 * Historically, vi permitted users to edit files that couldn't
267 * be read. This isn't useful for single files from a command
268 * line, but it's quite useful for "vi *.c", since you can skip
269 * past files that you can't read.
276 * Do the remaining things that can cause failure of the new file,
277 * mark and logging initialization.
279 if (mark_init(sp
, ep
) || log_init(sp
, ep
))
283 * Set the alternate file name to be the file we're discarding.
286 * Temporary files can't become alternate files, so there's no file
287 * name. This matches historical practice, although it could only
288 * happen in historical vi as the result of the initial command, i.e.
289 * if vi was executed without a file name.
291 if (LF_ISSET(FS_SETALT
))
292 set_alt_name(sp
, sp
->frp
== NULL
||
293 F_ISSET(sp
->frp
, FR_TMPFILE
) ? NULL
: sp
->frp
->name
);
296 * Close the previous file; if that fails, close the new one and run
300 * There's a nasty special case. If the user edits a temporary file,
301 * and then does an ":e! %", we need to re-initialize the backing
302 * file, but we can't change the name. (It's worse -- we're dealing
303 * with *names* here, we can't even detect that it happened.) Set a
304 * flag so that the file_end routine ignores the backing information
305 * of the old file if it happens to be the same as the new one.
308 * Side-effect: after the call to file_end(), sp->frp may be NULL.
310 if (sp
->ep
!= NULL
) {
311 F_SET(frp
, FR_DONTDELETE
);
312 if (file_end(sp
, NULL
, LF_ISSET(FS_FORCE
))) {
313 (void)file_end(sp
, ep
, 1);
316 F_CLR(frp
, FR_DONTDELETE
);
320 * Lock the file; if it's a recovery file, it should already be
321 * locked. Note, we acquire the lock after the previous file
322 * has been ended, so that we don't get an "already locked" error
326 * While the user can't interrupt us between the open and here,
327 * there's a race between the dbopen() and the lock. Not much
328 * we can do about it.
331 * We don't make a big deal of not being able to lock the file. As
332 * locking rarely works over NFS, and often fails if the file was
333 * mmap(2)'d, it's far too common to do anything like print an error
334 * message, let alone make the file readonly. At some future time,
335 * when locking is a little more reliable, this should change to be
338 if (rcv_name
== NULL
)
339 switch (file_lock(sp
, oname
, ep
->db
->fd(ep
->db
), 0)) {
341 F_SET(frp
, FR_UNLOCKED
);
345 if (F_ISSET(sp
, SC_READONLY
))
347 msgq_str(sp
, M_INFO
, oname
,
348 "239|%s already locked, session is read-only");
355 * Historically, the readonly edit option was set per edit buffer in
356 * vi, unless the -R command-line option was specified or the program
357 * was executed as "view". (Well, to be truthful, if the letter 'w'
358 * occurred anywhere in the program name, but let's not get into that.)
359 * So, the persistant readonly state has to be stored in the screen
360 * structure, and the edit option value toggles with the contents of
361 * the edit buffer. If the persistant readonly flag is set, set the
362 * readonly edit option.
364 * Otherwise, try and figure out if a file is readonly. This is a
365 * dangerous thing to do. The kernel is the only arbiter of whether
366 * or not a file is writeable, and the best that a user program can
367 * do is guess. Obvious loopholes are files that are on a file system
368 * mounted readonly (access catches this one on a few systems), or
369 * alternate protection mechanisms, ACL's for example, that we can't
370 * portably check. Lots of fun, and only here because users whined.
373 * Historic vi displayed the readonly message if none of the file
374 * write bits were set, or if an an access(2) call on the path
375 * failed. This seems reasonable. If the file is mode 444, root
376 * users may want to know that the owner of the file did not expect
379 * Historic vi set the readonly bit if no write bits were set for
380 * a file, even if the access call would have succeeded. This makes
381 * the superuser force the write even when vi expects that it will
382 * succeed. I'm less supportive of this semantic, but it's historic
383 * practice and the conservative approach to vi'ing files as root.
385 * It would be nice if there was some way to update this when the user
386 * does a "^Z; chmod ...". The problem is that we'd first have to
387 * distinguish between readonly bits set because of file permissions
388 * and those set for other reasons. That's not too hard, but deciding
389 * when to reevaluate the permissions is trickier. An alternative
390 * might be to turn off the readonly bit if the user forces a write
394 * Access(2) doesn't consider the effective uid/gid values. This
395 * probably isn't a problem for vi when it's running standalone.
397 if (readonly
|| F_ISSET(sp
, SC_READONLY
) ||
398 (!F_ISSET(frp
, FR_NEWFILE
) &&
399 (!(sb
.st_mode
& (S_IWUSR
| S_IWGRP
| S_IWOTH
)) ||
400 access(frp
->name
, W_OK
))))
401 O_SET(sp
, O_READONLY
);
403 O_CLR(sp
, O_READONLY
);
410 /* Detect and set the file encoding */
413 /* Set the initial cursor position, queue initial command. */
416 /* Redraw the screen from scratch, schedule a welcome message. */
417 F_SET(sp
, SC_SCR_REFORMAT
| SC_STATUS
);
421 err
: if (frp
->name
!= NULL
) {
425 if (frp
->tname
!= NULL
) {
426 (void)unlink(frp
->tname
);
431 oerr
: if (F_ISSET(ep
, F_RCV_ON
))
432 (void)unlink(ep
->rcv_path
);
433 if (ep
->rcv_path
!= NULL
) {
438 (void)ep
->db
->close(ep
->db
);
442 file_init(sp
, frp
, rcv_name
, flags
| FS_OPENERR
) : 1);
447 * Scan the user's path to find the file that we're going to
460 char *name
, *p
, *t
, *path
;
463 * If the name is NULL or an explicit reference (i.e., the first
464 * component is . or ..) ignore the O_PATH option.
471 if (name
[0] == '/' || (name
[0] == '.' &&
472 (name
[1] == '/' || (name
[1] == '.' && name
[2] == '/')))) {
473 *existsp
= !stat(name
, sbp
);
478 if (!stat(name
, sbp
)) {
483 /* Try the O_PATH option values. */
484 for (found
= 0, p
= t
= O_STR(sp
, O_PATH
);; ++p
)
485 if (*p
== ':' || *p
== '\0') {
487 * Ignore the empty strings and ".", since we've already
488 * tried the current directory.
490 if (t
< p
&& (p
- t
!= 1 || *t
!= '.')) {
493 if ((path
= join(t
, name
)) == NULL
) {
494 msgq(sp
, M_SYSERR
, NULL
);
499 if (!stat(path
, sbp
)) {
510 /* If we found it, build a new pathname and discard the old one. */
521 * Set up the initial cursor position.
533 /* Set some basic defaults. */
538 * Historically, initial commands (the -c option) weren't executed
539 * until a file was loaded, e.g. "vi +10 nofile", followed by an
540 * :edit or :tag command, would execute the +10 on the file loaded
541 * by the subsequent command, (assuming that it existed). This
542 * applied as well to files loaded using the tag commands, and we
543 * follow that historic practice. Also, all initial commands were
544 * ex commands and were always executed on the last line of the file.
546 * Otherwise, if no initial command for this file:
547 * If in ex mode, move to the last line, first nonblank character.
548 * If the file has previously been edited, move to the last known
549 * position, and check it for validity.
550 * Otherwise, move to the first line, first nonblank.
552 * This gets called by the file init code, because we may be in a
553 * file of ex commands and we want to execute them from the right
554 * location in the file.
558 if (gp
->c_option
!= NULL
&& !F_ISSET(sp
->frp
, FR_NEWFILE
)) {
559 if (db_last(sp
, &sp
->lno
))
565 CHAR2INT(sp
, gp
->c_option
, strlen(gp
->c_option
) + 1,
567 if (ex_run_str(sp
, "-c option", wp
, wlen
- 1, 1, 1))
570 } else if (F_ISSET(sp
, SC_EX
)) {
571 if (db_last(sp
, &sp
->lno
))
580 if (F_ISSET(sp
->frp
, FR_CURSORSET
)) {
581 sp
->lno
= sp
->frp
->lno
;
582 sp
->cno
= sp
->frp
->cno
;
584 /* If returning to a file in vi, center the line. */
585 F_SET(sp
, SC_SCR_CENTER
);
587 if (O_ISSET(sp
, O_COMMENT
))
593 if (db_get(sp
, sp
->lno
, 0, NULL
, &len
)) {
598 if (!nb
&& sp
->cno
> len
)
603 (void)nonblank(sp
, sp
->lno
, &sp
->cno
);
608 * The initial column is also the most attractive column.
614 * Historically, vi initialized the absolute mark, but ex did not.
615 * Which meant, that if the first command in ex mode was "visual",
616 * or if an ex command was executed first (e.g. vi +10 file) vi was
617 * entered without the mark being initialized. For consistency, if
618 * the file isn't empty, we initialize it for everyone, believing
619 * that it can't hurt, and is generally useful. Not initializing it
620 * if the file is empty is historic practice, although it has always
621 * been possible to set (and use) marks in empty vi files.
625 (void)mark_set(sp
, ABSMARK1
, &m
, 0);
630 * Stop editing a file.
632 * PUBLIC: int file_end(SCR *, EXF *, int);
644 * ep MAY NOT BE THE SAME AS sp->ep, DON'T USE THE LATTER.
645 * (If argument ep is NULL, use sp->ep.)
647 * If multiply referenced, just decrement the count and return.
651 if (--ep
->refcnt
!= 0)
656 * Clean up the FREF structure.
658 * Save the cursor location.
661 * It would be cleaner to do this somewhere else, but by the time
662 * ex or vi knows that we're changing files it's already happened.
667 F_SET(frp
, FR_CURSORSET
);
670 * We may no longer need the temporary backing file, so clean it
671 * up. We don't need the FREF structure either, if the file was
672 * never named, so lose it.
675 * Re: FR_DONTDELETE, see the comment above in file_init().
677 if (!F_ISSET(frp
, FR_DONTDELETE
) && frp
->tname
!= NULL
) {
678 if (unlink(frp
->tname
))
679 msgq_str(sp
, M_SYSERR
, frp
->tname
, "240|%s: remove");
682 if (F_ISSET(frp
, FR_TMPFILE
)) {
683 TAILQ_REMOVE(sp
->gp
->frefq
, frp
, q
);
684 if (frp
->name
!= NULL
)
692 * Clean up the EXF structure.
694 * Close the db structure.
696 if (ep
->db
->close
!= NULL
&& ep
->db
->close(ep
->db
) && !force
) {
697 msgq_str(sp
, M_SYSERR
, frp
->name
, "241|%s: close");
702 /* COMMITTED TO THE CLOSE. THERE'S NO GOING BACK... */
705 (void)log_end(sp
, ep
);
707 /* Free up any marks. */
708 (void)mark_end(sp
, ep
);
711 * Delete recovery files, close the open descriptor, free recovery
712 * memory. See recover.c for a description of the protocol.
715 * Unlink backup file first, we can detect that the recovery file
716 * doesn't reference anything when the user tries to recover it.
717 * There's a race, here, obviously, but it's fairly small.
719 if (!F_ISSET(ep
, F_RCV_NORM
)) {
720 if (ep
->rcv_path
!= NULL
&& unlink(ep
->rcv_path
))
721 msgq_str(sp
, M_SYSERR
, ep
->rcv_path
, "242|%s: remove");
722 if (ep
->rcv_mpath
!= NULL
&& unlink(ep
->rcv_mpath
))
723 msgq_str(sp
, M_SYSERR
, ep
->rcv_mpath
, "243|%s: remove");
725 if (ep
->rcv_fd
!= -1)
726 (void)close(ep
->rcv_fd
);
727 if (ep
->rcv_path
!= NULL
)
729 if (ep
->rcv_mpath
!= NULL
)
740 * Write the file to disk. Historic vi had fairly convoluted
741 * semantics for whether or not writes would happen. That's
744 * PUBLIC: int file_write(SCR *, MARK *, MARK *, char *, int);
754 enum { NEWFILE
, OLDFILE
} mtype
;
762 int fd
, nf
, noname
, oflags
, rval
;
763 char *p
, *s
, *t
, buf
[1024];
770 * Writing '%', or naming the current file explicitly, has the
771 * same semantics as writing without a name.
773 if (name
== NULL
|| !strcmp(name
, frp
->name
)) {
779 /* Can't write files marked read-only, unless forced. */
780 if (!LF_ISSET(FS_FORCE
) && noname
&& O_ISSET(sp
, O_READONLY
)) {
781 msgq(sp
, M_ERR
, LF_ISSET(FS_POSSIBLE
) ?
782 "244|Read-only file, not written; use ! to override" :
783 "245|Read-only file, not written");
787 /* If not forced, not appending, and "writeany" not set ... */
788 if (!LF_ISSET(FS_FORCE
| FS_APPEND
) && !O_ISSET(sp
, O_WRITEANY
)) {
789 /* Don't overwrite anything but the original file. */
790 if ((!noname
|| F_ISSET(frp
, FR_NAMECHANGE
)) &&
792 msgq_str(sp
, M_ERR
, name
,
793 LF_ISSET(FS_POSSIBLE
) ?
794 "246|%s exists, not written; use ! to override" :
795 "247|%s exists, not written");
800 * Don't write part of any existing file. Only test for the
801 * original file, the previous test catches anything else.
803 if (!LF_ISSET(FS_ALL
) && noname
&& !stat(name
, &sb
)) {
804 msgq(sp
, M_ERR
, LF_ISSET(FS_POSSIBLE
) ?
805 "248|Partial file, not written; use ! to override" :
806 "249|Partial file, not written");
812 * Figure out if the file already exists -- if it doesn't, we display
813 * the "new file" message. The stat might not be necessary, but we
814 * just repeat it because it's easier than hacking the previous tests.
815 * The information is only used for the user message and modification
816 * time test, so we can ignore the obvious race condition.
818 * One final test. If we're not forcing or appending the current file,
819 * and we have a saved modification time, object if the file changed
820 * since we last edited or wrote it, and make them force it.
825 if (noname
&& !LF_ISSET(FS_FORCE
| FS_APPEND
) &&
826 ((F_ISSET(ep
, F_DEVSET
) &&
827 (sb
.st_dev
!= ep
->mdev
|| sb
.st_ino
!= ep
->minode
)) ||
828 timespeccmp(&sb
.st_mtimespec
, &ep
->mtim
, !=))) {
829 msgq_str(sp
, M_ERR
, name
, LF_ISSET(FS_POSSIBLE
) ?
830 "250|%s: file modified more recently than this copy; use ! to override" :
831 "251|%s: file modified more recently than this copy");
838 /* Set flags to create, write, and either append or truncate. */
839 oflags
= O_CREAT
| O_WRONLY
|
840 (LF_ISSET(FS_APPEND
) ? O_APPEND
: O_TRUNC
);
842 /* Backup the file if requested. */
843 if (!opts_empty(sp
, O_BACKUP
, 1) &&
844 file_backup(sp
, name
, O_STR(sp
, O_BACKUP
)) && !LF_ISSET(FS_FORCE
))
848 if ((fd
= open(name
, oflags
,
849 S_IRUSR
| S_IWUSR
| S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
)) < 0) {
850 if (errno
== EACCES
&& LF_ISSET(FS_FORCE
)) {
852 * If the user owns the file but does not
853 * have write permission on it, grant it
854 * automatically for the duration of the
855 * opening of the file, if possible.
860 if (stat(name
, &sb
) != 0)
863 if (!(sb
.st_mode
& S_IWUSR
) && sb
.st_uid
== getuid())
867 if (chmod(name
, fmode
) != 0)
869 fd
= open(name
, oflags
, S_IRUSR
| S_IWUSR
|
870 S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
);
873 (void)fchmod(fd
, sb
.st_mode
);
878 msgq_str(sp
, M_SYSERR
, name
, "%s");
883 /* Try and get a lock. */
884 if (!noname
&& file_lock(sp
, NULL
, fd
, 0) == LOCK_UNAVAIL
)
885 msgq_str(sp
, M_ERR
, name
,
886 "252|%s: write lock was unavailable");
889 * Use stdio for buffering.
892 * SVR4.2 requires the fdopen mode exactly match the original open
893 * mode, i.e. you have to open with "a" if appending.
895 if ((fp
= fdopen(fd
, LF_ISSET(FS_APPEND
) ? "a" : "w")) == NULL
) {
896 msgq_str(sp
, M_SYSERR
, name
, "%s");
901 /* Build fake addresses, if necessary. */
906 if (db_last(sp
, &to
.lno
))
912 rval
= ex_writefp(sp
, name
, fp
, fm
, tm
, &nlno
, &nch
, 0);
915 * Save the new last modification time -- even if the write fails
916 * we re-init the time. That way the user can clean up the disk
917 * and rewrite without having to force it.
921 timepoint_system(&ep
->mtim
);
924 ep
->mdev
= sb
.st_dev
;
925 ep
->minode
= sb
.st_ino
;
927 ep
->mtim
= sb
.st_mtimespec
;
931 * If the write failed, complain loudly. ex_writefp() has already
932 * complained about the actual error, reinforce it if data was lost.
935 if (!LF_ISSET(FS_APPEND
))
936 msgq_str(sp
, M_ERR
, name
,
937 "254|%s: WARNING: FILE TRUNCATED");
942 * Once we've actually written the file, it doesn't matter that the
943 * file name was changed -- if it was, we've already whacked it.
945 F_CLR(frp
, FR_NAMECHANGE
);
948 * If wrote the entire file, and it wasn't by appending it to a file,
949 * clear the modified bit. If the file was written to the original
950 * file name and the file is a temporary, set the "no exit" bit. This
951 * permits the user to write the file and use it in the context of the
952 * filesystem, but still keeps them from discarding their changes by
955 if (LF_ISSET(FS_ALL
) && !LF_ISSET(FS_APPEND
)) {
956 F_CLR(ep
, F_MODIFIED
);
957 if (F_ISSET(frp
, FR_TMPFILE
))
959 F_SET(frp
, FR_TMPEXIT
);
961 F_CLR(frp
, FR_TMPEXIT
);
964 p
= msg_print(sp
, name
, &nf
);
968 "256|%s: new file: %lu lines, %lu characters", NULL
);
969 len
= snprintf(buf
, sizeof(buf
), msgstr
, p
, nlno
, nch
);
972 msgstr
= msg_cat(sp
, LF_ISSET(FS_APPEND
) ?
973 "315|%s: appended: %lu lines, %lu characters" :
974 "257|%s: %lu lines, %lu characters", NULL
);
975 len
= snprintf(buf
, sizeof(buf
), msgstr
, p
, nlno
, nch
);
982 * There's a nasty problem with long path names. Cscope and tags files
983 * can result in long paths and vi will request a continuation key from
984 * the user. Unfortunately, the user has typed ahead, and chaos will
985 * result. If we assume that the characters in the filenames only take
986 * a single screen column each, we can trim the filename.
989 if (len
>= sp
->cols
) {
990 for (s
= buf
, t
= buf
+ strlen(p
); s
< t
&&
991 (*s
!= '/' || len
>= sp
->cols
- 3); ++s
, --len
);
995 *--s
= '.'; /* Leading ellipses. */
1000 msgq(sp
, M_INFO
, "%s", s
);
1002 FREE_SPACE(sp
, p
, 0);
1008 * Backup the about-to-be-written file.
1011 * We do the backup by copying the entire file. It would be nice to do
1012 * a rename instead, but: (1) both files may not fit and we want to fail
1013 * before doing the rename; (2) the backup file may not be on the same
1014 * disk partition as the file being written; (3) there may be optional
1015 * file information (MACs, DACs, whatever) that we won't get right if we
1016 * recreate the file. So, let's not risk it.
1030 int flags
, maxnum
, nr
, num
, nw
, rfd
, wfd
, version
;
1031 char *bp
, *estr
, *p
, *pct
, *slash
, *t
, *wfname
, buf
[8192];
1038 bp
= estr
= wfname
= NULL
;
1041 * Open the current file for reading. Do this first, so that
1042 * we don't exec a shell before the most likely failure point.
1043 * If it doesn't exist, it's okay, there's just nothing to back
1047 if ((rfd
= open(name
, O_RDONLY
, 0)) < 0) {
1048 if (errno
== ENOENT
)
1055 * If the name starts with an 'N' character, add a version number
1056 * to the name. Strip the leading N from the string passed to the
1057 * expansion routines, for no particular reason. It would be nice
1058 * to permit users to put the version number anywhere in the backup
1059 * name, but there isn't a special character that we can use in the
1060 * name, and giving a new character a special meaning leads to ugly
1061 * hacks both here and in the supporting ex routines.
1063 * Shell and file name expand the option's value.
1065 ex_cinit(sp
, &cmd
, 0, 0, 0, 0, 0);
1066 if (bname
[0] == 'N') {
1071 CHAR2INT(sp
, bname
, strlen(bname
), wp
, wlen
);
1072 if ((wp
= v_wstrdup(sp
, wp
, wlen
)) == NULL
)
1074 if (argv_exp2(sp
, &cmd
, wp
, wlen
)) {
1081 * 0 args: impossible.
1083 * >1 args: object, too many args.
1085 if (cmd
.argc
!= 1) {
1086 msgq_str(sp
, M_ERR
, bname
,
1087 "258|%s expanded into too many file names");
1093 * If appending a version number, read through the directory, looking
1094 * for file names that match the name followed by a number. Make all
1095 * of the other % characters in name literal, so the user doesn't get
1096 * surprised and sscanf doesn't drop core indirecting through pointers
1097 * that don't exist. If any such files are found, increment its number
1101 GET_SPACE_GOTOC(sp
, bp
, blen
, cmd
.argv
[0]->len
* 2 + 50);
1102 INT2CHAR(sp
, cmd
.argv
[0]->bp
, cmd
.argv
[0]->len
+ 1,
1106 for (t
= bp
, slash
= NULL
;
1107 p
[0] != '\0'; *t
++ = *p
++)
1111 } else if (p
[0] == '/')
1118 if (slash
== NULL
) {
1119 dirp
= opendir(".");
1128 INT2CHAR(sp
, cmd
.argv
[0]->bp
, cmd
.argv
[0]->len
+ 1,
1133 for (maxnum
= 0; (dp
= readdir(dirp
)) != NULL
;)
1134 if (sscanf(dp
->d_name
, p
, &num
) == 1 && num
> maxnum
)
1136 (void)closedir(dirp
);
1138 /* Format the backup file name. */
1139 (void)snprintf(pct
, blen
- (pct
- bp
), "%d", maxnum
+ 1);
1143 INT2CHAR(sp
, cmd
.argv
[0]->bp
, cmd
.argv
[0]->len
+ 1,
1147 /* Open the backup file, avoiding lurkers. */
1148 if (stat(wfname
, &sb
) == 0) {
1149 if (!S_ISREG(sb
.st_mode
)) {
1150 msgq_str(sp
, M_ERR
, bname
,
1151 "259|%s: not a regular file");
1154 if (sb
.st_uid
!= getuid()) {
1155 msgq_str(sp
, M_ERR
, bname
, "260|%s: not owned by you");
1158 if (sb
.st_mode
& (S_IRGRP
| S_IWGRP
| S_IROTH
| S_IWOTH
)) {
1159 msgq_str(sp
, M_ERR
, bname
,
1160 "261|%s: accessible by a user other than the owner");
1165 flags
= O_CREAT
| O_EXCL
;
1166 if ((wfd
= open(wfname
, flags
| O_WRONLY
, S_IRUSR
| S_IWUSR
)) < 0) {
1171 /* Copy the file's current contents to its backup value. */
1172 while ((nr
= read(rfd
, buf
, sizeof(buf
))) > 0)
1173 for (off
= 0; nr
!= 0; nr
-= nw
, off
+= nw
)
1174 if ((nw
= write(wfd
, buf
+ off
, nr
)) < 0) {
1192 FREE_SPACE(sp
, bp
, blen
);
1199 (void)unlink(wfname
);
1203 msgq_str(sp
, M_SYSERR
, estr
, "%s");
1207 FREE_SPACE(sp
, bp
, blen
);
1213 * Read the first line and set the O_FILEENCODING.
1216 file_encinit(SCR
*sp
)
1218 #if defined(USE_WIDECHAR) && defined(USE_ICONV)
1222 char buf
[4096]; /* not need to be '\0'-terminated */
1228 while (!db_rget(sp
, ln
++, &p
, &len
)) {
1229 if (blen
+ len
> sizeof(buf
))
1230 len
= sizeof(buf
) - blen
;
1231 memcpy(buf
+ blen
, p
, len
);
1233 if (blen
== sizeof(buf
))
1240 * Detect UTF-8 and fallback to the locale/preset encoding.
1243 * A manually set O_FILEENCODING indicates the "fallback
1244 * encoding", but UTF-8, which can be safely detected, is not
1245 * inherited from the old screen.
1247 if (looks_utf8(buf
, blen
) > 1)
1248 o_set(sp
, O_FILEENCODING
, OS_STRDUP
, "utf-8", 0);
1249 else if (!O_ISSET(sp
, O_FILEENCODING
) ||
1250 !strcasecmp(O_STR(sp
, O_FILEENCODING
), "utf-8"))
1251 o_set(sp
, O_FILEENCODING
, OS_STRDUP
, codeset(), 0);
1253 conv_enc(sp
, O_FILEENCODING
, 0);
1259 * Skip the first comment.
1262 file_comment(SCR
*sp
)
1268 for (lno
= 1; !db_get(sp
, lno
, 0, &p
, &len
) && len
== 0; ++lno
);
1272 F_SET(sp
, SC_SCR_TOP
);
1273 while (!db_get(sp
, ++lno
, 0, &p
, &len
))
1274 if (len
< 1 || p
[0] != '#') {
1278 } else if (len
> 1 && p
[0] == '/' && p
[1] == '*') {
1279 F_SET(sp
, SC_SCR_TOP
);
1281 for (; len
> 1; --len
, ++p
)
1282 if (p
[0] == '*' && p
[1] == '/') {
1286 } while (!db_get(sp
, ++lno
, 0, &p
, &len
));
1287 } else if (len
> 1 && p
[0] == '/' && p
[1] == '/') {
1288 F_SET(sp
, SC_SCR_TOP
);
1292 for (; len
> 1; --len
, ++p
)
1293 if (p
[0] == '/' && p
[1] == '/') {
1297 } while (!db_get(sp
, ++lno
, 0, &p
, &len
));
1303 * First modification check routine. The :next, :prev, :rewind, :tag,
1304 * :tagpush, :tagpop, ^^ modifications check.
1306 * PUBLIC: int file_m1(SCR *, int, int);
1318 /* If no file loaded, return no modifications. */
1323 * If the file has been modified, we'll want to write it back or
1324 * fail. If autowrite is set, we'll write it back automatically,
1325 * unless force is also set. Otherwise, we fail unless forced or
1326 * there's another open screen on this file.
1328 if (F_ISSET(ep
, F_MODIFIED
))
1329 if (O_ISSET(sp
, O_AUTOWRITE
)) {
1330 if (!force
&& file_aw(sp
, flags
))
1332 } else if (ep
->refcnt
<= 1 && !force
) {
1333 msgq(sp
, M_ERR
, LF_ISSET(FS_POSSIBLE
) ?
1334 "262|File modified since last complete write; write or use ! to override" :
1335 "263|File modified since last complete write; write or use :edit! to override");
1339 return (file_m3(sp
, force
));
1344 * Second modification check routine. The :edit, :quit, :recover
1345 * modifications check.
1347 * PUBLIC: int file_m2(SCR *, int);
1358 /* If no file loaded, return no modifications. */
1363 * If the file has been modified, we'll want to fail, unless forced
1364 * or there's another open screen on this file.
1366 if (F_ISSET(ep
, F_MODIFIED
) && ep
->refcnt
<= 1 && !force
) {
1368 "264|File modified since last complete write; write or use ! to override");
1372 return (file_m3(sp
, force
));
1377 * Third modification check routine.
1379 * PUBLIC: int file_m3(SCR *, int);
1390 /* If no file loaded, return no modifications. */
1395 * Don't exit while in a temporary files if the file was ever modified.
1396 * The problem is that if the user does a ":wq", we write and quit,
1397 * unlinking the temporary file. Not what the user had in mind at all.
1398 * We permit writing to temporary files, so that user maps using file
1399 * system names work with temporary files.
1401 if (F_ISSET(sp
->frp
, FR_TMPEXIT
) && ep
->refcnt
<= 1 && !force
) {
1403 "265|File is a temporary; exit will discard modifications");
1411 * Autowrite routine. If modified, autowrite is set and the readonly bit
1412 * is not set, write the file. A routine so there's a place to put the
1415 * PUBLIC: int file_aw(SCR *, int);
1422 if (!F_ISSET(sp
->ep
, F_MODIFIED
))
1424 if (!O_ISSET(sp
, O_AUTOWRITE
))
1429 * Historic 4BSD vi attempted to write the file if autowrite was set,
1430 * regardless of the writeability of the file (as defined by the file
1431 * readonly flag). System V changed this as some point, not attempting
1432 * autowrite if the file was readonly. This feels like a bug fix to
1433 * me (e.g. the principle of least surprise is violated if readonly is
1434 * set and vi writes the file), so I'm compatible with System V.
1436 if (O_ISSET(sp
, O_READONLY
)) {
1438 "266|File readonly, modifications not auto-written");
1441 return (file_write(sp
, NULL
, NULL
, NULL
, flags
));
1446 * Set the alternate pathname.
1448 * Set the alternate pathname. It's a routine because I wanted some place
1449 * to hang this comment. The alternate pathname (normally referenced using
1450 * the special character '#' during file expansion and in the vi ^^ command)
1451 * is set by almost all ex commands that take file names as arguments. The
1452 * rules go something like this:
1454 * 1: If any ex command takes a file name as an argument (except for the
1455 * :next command), the alternate pathname is set to that file name.
1456 * This excludes the command ":e" and ":w !command" as no file name
1457 * was specified. Note, historically, the :source command did not set
1458 * the alternate pathname. It does in nvi, for consistency.
1460 * 2: However, if any ex command sets the current pathname, e.g. the
1461 * ":e file" or ":rew" commands succeed, then the alternate pathname
1462 * is set to the previous file's current pathname, if it had one.
1463 * This includes the ":file" command and excludes the ":e" command.
1464 * So, by rule #1 and rule #2, if ":edit foo" fails, the alternate
1465 * pathname will be "foo", if it succeeds, the alternate pathname will
1466 * be the previous current pathname. The ":e" command will not set
1467 * the alternate or current pathnames regardless.
1469 * 3: However, if it's a read or write command with a file argument and
1470 * the current pathname has not yet been set, the file name becomes
1471 * the current pathname, and the alternate pathname is unchanged.
1473 * If the user edits a temporary file, there may be times when there is no
1474 * alternative file name. A name argument of NULL turns it off.
1476 * PUBLIC: void set_alt_name(SCR *, char *);
1483 if (sp
->alt_name
!= NULL
)
1486 sp
->alt_name
= NULL
;
1487 else if ((sp
->alt_name
= strdup(name
)) == NULL
)
1488 msgq(sp
, M_SYSERR
, NULL
);
1493 * Get an exclusive lock on a file.
1495 * PUBLIC: lockr_t file_lock(SCR *, char *, int, int);
1504 if (!O_ISSET(sp
, O_LOCKFILES
))
1505 return (LOCK_SUCCESS
);
1509 * We need to distinguish a lock not being available for the file
1510 * from the file system not supporting locking. Flock is documented
1511 * as returning EWOULDBLOCK; add EAGAIN for good measure, and assume
1512 * they are the former. There's no portable way to do this.
1515 if (!flock(fd
, LOCK_EX
| LOCK_NB
)) {
1516 fcntl(fd
, F_SETFD
, 1);
1517 return (LOCK_SUCCESS
);
1519 return (errno
== EAGAIN
1521 || errno
== EWOULDBLOCK
1523 ? LOCK_UNAVAIL
: LOCK_FAILED
);