2 * Copyright (c) 1990, 1993, 1994
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * $OpenBSD: fts.c,v 1.22 1999/10/03 19:22:22 millert Exp $
33 #if defined(LIBC_SCCS) && !defined(lint)
34 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94";
35 #endif /* LIBC_SCCS and not lint */
38 #include <sys/cdefs.h>
39 __FBSDID("$FreeBSD$");
41 #include "namespace.h"
42 #include <sys/param.h>
43 #include <sys/mount.h>
53 #include "un-namespace.h"
55 #include "gen-private.h"
57 static FTSENT *fts_alloc(FTS *, char *, size_t);
58 static FTSENT *fts_build(FTS *, int);
59 static void fts_lfree(FTSENT *);
60 static void fts_load(FTS *, FTSENT *);
61 static size_t fts_maxarglen(char * const *);
62 static void fts_padjust(FTS *, FTSENT *);
63 static int fts_palloc(FTS *, size_t);
64 static FTSENT *fts_sort(FTS *, FTSENT *, size_t);
65 static int fts_stat(FTS *, FTSENT *, int, int);
66 static int fts_safe_changedir(FTS *, FTSENT *, int, char *);
67 static int fts_ufslinks(FTS *, const FTSENT *);
69 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
71 #define CLR(opt) (sp->fts_options &= ~(opt))
72 #define ISSET(opt) (sp->fts_options & (opt))
73 #define SET(opt) (sp->fts_options |= (opt))
75 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd))
78 #define BCHILD 1 /* fts_children */
79 #define BNAMES 2 /* fts_children, names only */
80 #define BREAD 3 /* fts_read */
83 * Internal representation of an FTS, including extra implementation
84 * details. The FTS returned from fts_open points to this structure's
85 * ftsp_fts member (and can be cast to an _fts_private as required)
89 struct statfs ftsp_statfs;
91 int ftsp_linksreliable;
95 * The "FTS_NOSTAT" option can avoid a lot of calls to stat(2) if it
96 * knows that a directory could not possibly have subdirectories. This
97 * is decided by looking at the link count: a subdirectory would
98 * increment its parent's link count by virtue of its own ".." entry.
99 * This assumption only holds for UFS-like filesystems that implement
100 * links and directories this way, so we must punt for others.
103 static const char *ufslike_filesystems[] = {
113 fts_open(char * const *argv, int options,
114 int (*compar)(const FTSENT * const *, const FTSENT * const *))
116 struct _fts_private *priv;
119 FTSENT *parent, *tmp;
123 if (options & ~FTS_OPTIONMASK) {
128 /* fts_open() requires at least one path */
134 /* Allocate/initialize the stream. */
135 if ((priv = calloc(1, sizeof(*priv))) == NULL)
137 sp = &priv->ftsp_fts;
138 sp->fts_compar = compar;
139 sp->fts_options = options;
144 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */
145 if (ISSET(FTS_LOGICAL))
149 * Start out with 1K of path space, and enough, in any case,
150 * to hold the user's paths.
152 if (fts_palloc(sp, MAX(fts_maxarglen(argv), MAXPATHLEN)))
155 /* Allocate/initialize root's parent. */
156 if ((parent = fts_alloc(sp, "", 0)) == NULL)
158 parent->fts_level = FTS_ROOTPARENTLEVEL;
160 /* Allocate/initialize root(s). */
161 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) {
164 p = fts_alloc(sp, *argv, len);
165 p->fts_level = FTS_ROOTLEVEL;
166 p->fts_parent = parent;
167 p->fts_accpath = p->fts_name;
168 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW), -1);
170 /* Command-line "." and ".." are real directories. */
171 if (p->fts_info == FTS_DOT)
175 * If comparison routine supplied, traverse in sorted
176 * order; otherwise traverse in the order specified.
191 if (compar && nitems > 1)
192 root = fts_sort(sp, root, nitems);
195 * Allocate a dummy pointer and make fts_read think that we've just
196 * finished the node before the root(s); set p->fts_info to FTS_INIT
197 * so that everything about the "current" node is ignored.
199 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
201 sp->fts_cur->fts_link = root;
202 sp->fts_cur->fts_info = FTS_INIT;
205 * If using chdir(2), grab a file descriptor pointing to dot to ensure
206 * that we can get back here; this could be avoided for some paths,
207 * but almost certainly not worth the effort. Slashes, symbolic links,
208 * and ".." are all fairly nasty problems. Note, if we can't get the
209 * descriptor we run anyway, just more slowly.
211 if (!ISSET(FTS_NOCHDIR) &&
212 (sp->fts_rfd = _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
217 mem3: fts_lfree(root);
219 mem2: free(sp->fts_path);
225 fts_load(FTS *sp, FTSENT *p)
231 * Load the stream structure for the next traversal. Since we don't
232 * actually enter the directory until after the preorder visit, set
233 * the fts_accpath field specially so the chdir gets done to the right
234 * place and the user can access the first node. From fts_open it's
235 * known that the path will fit.
237 len = p->fts_pathlen = p->fts_namelen;
238 memmove(sp->fts_path, p->fts_name, len + 1);
239 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) {
241 memmove(p->fts_name, cp, len + 1);
242 p->fts_namelen = len;
244 p->fts_accpath = p->fts_path = sp->fts_path;
245 sp->fts_dev = p->fts_dev;
255 * This still works if we haven't read anything -- the dummy structure
256 * points to the root list, so we step through to the end of the root
257 * list which has a valid parent pointer.
260 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) {
262 p = p->fts_link != NULL ? p->fts_link : p->fts_parent;
268 /* Free up child linked list, sort array, path buffer. */
270 fts_lfree(sp->fts_child);
275 /* Return to original directory, save errno if necessary. */
276 if (!ISSET(FTS_NOCHDIR)) {
277 saved_errno = fchdir(sp->fts_rfd) ? errno : 0;
278 (void)_close(sp->fts_rfd);
280 /* Set errno and return. */
281 if (saved_errno != 0) {
282 /* Free up the stream pointer. */
289 /* Free up the stream pointer. */
295 * Special case of "/" at the end of the path so that slashes aren't
296 * appended which would cause paths to be written as "....//foo".
299 (p->fts_path[p->fts_pathlen - 1] == '/' \
300 ? p->fts_pathlen - 1 : p->fts_pathlen)
310 /* If finished or unrecoverable error, return NULL. */
311 if (sp->fts_cur == NULL || ISSET(FTS_STOP))
314 /* Set current node pointer. */
317 /* Save and zero out user instructions. */
318 instr = p->fts_instr;
319 p->fts_instr = FTS_NOINSTR;
321 /* Any type of file may be re-visited; re-stat and re-turn. */
322 if (instr == FTS_AGAIN) {
323 p->fts_info = fts_stat(sp, p, 0, -1);
328 * Following a symlink -- SLNONE test allows application to see
329 * SLNONE and recover. If indirecting through a symlink, have
330 * keep a pointer to current location. If unable to get that
331 * pointer, follow fails.
333 if (instr == FTS_FOLLOW &&
334 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
335 p->fts_info = fts_stat(sp, p, 1, -1);
336 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
337 if ((p->fts_symfd = _open(".", O_RDONLY | O_CLOEXEC,
339 p->fts_errno = errno;
340 p->fts_info = FTS_ERR;
342 p->fts_flags |= FTS_SYMFOLLOW;
347 /* Directory in pre-order. */
348 if (p->fts_info == FTS_D) {
349 /* If skipped or crossed mount point, do post-order visit. */
350 if (instr == FTS_SKIP ||
351 (ISSET(FTS_XDEV) && p->fts_dev != sp->fts_dev)) {
352 if (p->fts_flags & FTS_SYMFOLLOW)
353 (void)_close(p->fts_symfd);
355 fts_lfree(sp->fts_child);
356 sp->fts_child = NULL;
358 p->fts_info = FTS_DP;
362 /* Rebuild if only read the names and now traversing. */
363 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) {
365 fts_lfree(sp->fts_child);
366 sp->fts_child = NULL;
370 * Cd to the subdirectory.
372 * If have already read and now fail to chdir, whack the list
373 * to make the names come out right, and set the parent errno
374 * so the application will eventually get an error condition.
375 * Set the FTS_DONTCHDIR flag so that when we logically change
376 * directories back to the parent we don't do a chdir.
378 * If haven't read do so. If the read fails, fts_build sets
379 * FTS_STOP or the fts_info field of the node.
381 if (sp->fts_child != NULL) {
382 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) {
383 p->fts_errno = errno;
384 p->fts_flags |= FTS_DONTCHDIR;
385 for (p = sp->fts_child; p != NULL;
388 p->fts_parent->fts_accpath;
390 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) {
396 sp->fts_child = NULL;
400 /* Move to the next node on this level. */
402 if ((p = p->fts_link) != NULL) {
404 * If reached the top, return to the original directory (or
405 * the root of the tree), and load the paths for the next root.
407 if (p->fts_level == FTS_ROOTLEVEL) {
408 if (FCHDIR(sp, sp->fts_rfd)) {
414 return (sp->fts_cur = p);
418 * User may have called fts_set on the node. If skipped,
419 * ignore. If followed, get a file descriptor so we can
420 * get back if necessary.
422 if (p->fts_instr == FTS_SKIP) {
426 if (p->fts_instr == FTS_FOLLOW) {
427 p->fts_info = fts_stat(sp, p, 1, -1);
428 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
430 _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0) {
431 p->fts_errno = errno;
432 p->fts_info = FTS_ERR;
434 p->fts_flags |= FTS_SYMFOLLOW;
436 p->fts_instr = FTS_NOINSTR;
441 name: t = sp->fts_path + NAPPEND(p->fts_parent);
443 memmove(t, p->fts_name, p->fts_namelen + 1);
444 return (sp->fts_cur = p);
447 /* Move up to the parent node. */
450 if (p->fts_level == FTS_ROOTPARENTLEVEL) {
452 * Done; free everything up and set errno to 0 so the user
453 * can distinguish between error and EOF.
458 return (sp->fts_cur = NULL);
461 /* NUL terminate the pathname. */
462 sp->fts_path[p->fts_pathlen] = '\0';
465 * Return to the parent directory. If at a root node or came through
466 * a symlink, go back through the file descriptor. Otherwise, cd up
469 if (p->fts_level == FTS_ROOTLEVEL) {
470 if (FCHDIR(sp, sp->fts_rfd)) {
474 } else if (p->fts_flags & FTS_SYMFOLLOW) {
475 if (FCHDIR(sp, p->fts_symfd)) {
477 (void)_close(p->fts_symfd);
482 (void)_close(p->fts_symfd);
483 } else if (!(p->fts_flags & FTS_DONTCHDIR) &&
484 fts_safe_changedir(sp, p->fts_parent, -1, "..")) {
489 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP;
490 return (sp->fts_cur = p);
494 * Fts_set takes the stream as an argument although it's not used in this
495 * implementation; it would be necessary if anyone wanted to add global
496 * semantics to fts using fts_set. An error return is allowed for similar
501 fts_set(FTS *sp, FTSENT *p, int instr)
503 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW &&
504 instr != FTS_NOINSTR && instr != FTS_SKIP) {
508 p->fts_instr = instr;
513 fts_children(FTS *sp, int instr)
518 if (instr != 0 && instr != FTS_NAMEONLY) {
523 /* Set current node pointer. */
527 * Errno set to 0 so user can distinguish empty directory from
532 /* Fatal errors stop here. */
536 /* Return logical hierarchy of user's arguments. */
537 if (p->fts_info == FTS_INIT)
538 return (p->fts_link);
541 * If not a directory being visited in pre-order, stop here. Could
542 * allow FTS_DNR, assuming the user has fixed the problem, but the
543 * same effect is available with FTS_AGAIN.
545 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */)
548 /* Free up any previous child list. */
549 if (sp->fts_child != NULL)
550 fts_lfree(sp->fts_child);
552 if (instr == FTS_NAMEONLY) {
559 * If using chdir on a relative path and called BEFORE fts_read does
560 * its chdir to the root of a traversal, we can lose -- we need to
561 * chdir into the subdirectory, and we don't know where the current
562 * directory is, so we can't get back so that the upcoming chdir by
563 * fts_read will work.
565 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' ||
567 return (sp->fts_child = fts_build(sp, instr));
569 if ((fd = _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
571 sp->fts_child = fts_build(sp, instr);
572 serrno = (sp->fts_child == NULL) ? errno : 0;
574 if (rc < 0 && serrno == 0)
580 return (sp->fts_child);
583 #ifndef fts_get_clientptr
584 #error "fts_get_clientptr not defined"
588 (fts_get_clientptr)(FTS *sp)
591 return (fts_get_clientptr(sp));
594 #ifndef fts_get_stream
595 #error "fts_get_stream not defined"
599 (fts_get_stream)(FTSENT *p)
601 return (fts_get_stream(p));
605 fts_set_clientptr(FTS *sp, void *clientptr)
608 sp->fts_clientptr = clientptr;
612 * This is the tricky part -- do not casually change *anything* in here. The
613 * idea is to build the linked list of entries that are used by fts_children
614 * and fts_read. There are lots of special cases.
616 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is
617 * set and it's a physical walk (so that symbolic links can't be directories),
618 * we can do things quickly. First, if it's a 4.4BSD file system, the type
619 * of the file is in the directory entry. Otherwise, we assume that the number
620 * of subdirectories in a node is equal to the number of links to the parent.
621 * The former skips all stat calls. The latter skips stat calls in any leaf
622 * directories and for any files after the subdirectories in the directory have
623 * been found, cutting the stat calls by about 2/3.
626 fts_build(FTS *sp, int type)
634 int cderrno, descend, oflag, saved_errno, nostat, doadjust;
636 long nlinks; /* has to be signed because -1 is a magic value */
637 size_t dnamlen, len, maxlen, nitems;
639 /* Set current node pointer. */
643 * Open the directory for reading. If this fails, we're done.
644 * If being called from fts_read, set the fts_info field.
647 if (ISSET(FTS_WHITEOUT))
648 oflag = DTF_NODUP | DTF_REWIND;
650 oflag = DTF_HIDEW | DTF_NODUP | DTF_REWIND;
652 #define __opendir2(path, flag) opendir(path)
654 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) {
656 cur->fts_info = FTS_DNR;
657 cur->fts_errno = errno;
663 * Nlinks is the number of possible entries of type directory in the
664 * directory if we're cheating on stat calls, 0 if we're not doing
665 * any stat calls at all, -1 if we're doing stats on everything.
667 if (type == BNAMES) {
669 /* Be quiet about nostat, GCC. */
671 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) {
672 if (fts_ufslinks(sp, cur))
673 nlinks = cur->fts_nlink - (ISSET(FTS_SEEDOT) ? 0 : 2);
683 (void)printf("nlinks == %d (cur: %d)\n", nlinks, cur->fts_nlink);
684 (void)printf("NOSTAT %d PHYSICAL %d SEEDOT %d\n",
685 ISSET(FTS_NOSTAT), ISSET(FTS_PHYSICAL), ISSET(FTS_SEEDOT));
688 * If we're going to need to stat anything or we want to descend
689 * and stay in the directory, chdir. If this fails we keep going,
690 * but set a flag so we don't chdir after the post-order visit.
691 * We won't be able to stat anything, but we can still return the
692 * names themselves. Note, that since fts_read won't be able to
693 * chdir into the directory, it will have to return different path
694 * names than before, i.e. "a/b" instead of "b". Since the node
695 * has already been visited in pre-order, have to wait until the
696 * post-order visit to return the error. There is a special case
697 * here, if there was nothing to stat then it's not an error to
698 * not be able to stat. This is all fairly nasty. If a program
699 * needed sorted entries or stat information, they had better be
700 * checking FTS_NS on the returned nodes.
703 if (nlinks || type == BREAD) {
704 if (fts_safe_changedir(sp, cur, _dirfd(dirp), NULL)) {
705 if (nlinks && type == BREAD)
706 cur->fts_errno = errno;
707 cur->fts_flags |= FTS_DONTCHDIR;
716 * Figure out the max file name length that can be stored in the
717 * current path -- the inner loop allocates more path as necessary.
718 * We really wouldn't have to do the maxlen calculations here, we
719 * could do them in fts_read before returning the path, but it's a
720 * lot easier here since the length is part of the dirent structure.
722 * If not changing directories set a pointer so that can just append
723 * each new name into the path.
726 if (ISSET(FTS_NOCHDIR)) {
727 cp = sp->fts_path + len;
730 /* GCC, you're too verbose. */
734 maxlen = sp->fts_pathlen - len;
736 level = cur->fts_level + 1;
738 /* Read the directory, attaching each entry to the `link' pointer. */
740 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) {
741 dnamlen = dp->d_namlen;
742 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name))
745 if ((p = fts_alloc(sp, dp->d_name, dnamlen)) == NULL)
747 if (dnamlen >= maxlen) { /* include space for NUL */
748 oldaddr = sp->fts_path;
749 if (fts_palloc(sp, dnamlen + len + 1)) {
751 * No more memory for path or structures. Save
752 * errno, free up the current structure and the
753 * structures already allocated.
755 mem1: saved_errno = errno;
759 (void)closedir(dirp);
760 cur->fts_info = FTS_ERR;
765 /* Did realloc() change the pointer? */
766 if (oldaddr != sp->fts_path) {
768 if (ISSET(FTS_NOCHDIR))
769 cp = sp->fts_path + len;
771 maxlen = sp->fts_pathlen - len;
774 p->fts_level = level;
775 p->fts_parent = sp->fts_cur;
776 p->fts_pathlen = len + dnamlen;
779 if (dp->d_type == DT_WHT)
780 p->fts_flags |= FTS_ISW;
785 p->fts_info = FTS_NS;
786 p->fts_errno = cderrno;
788 p->fts_info = FTS_NSOK;
789 p->fts_accpath = cur->fts_accpath;
790 } else if (nlinks == 0
793 dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN)
797 ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name;
798 p->fts_info = FTS_NSOK;
800 /* Build a file name for fts_stat to stat. */
801 if (ISSET(FTS_NOCHDIR)) {
802 p->fts_accpath = p->fts_path;
803 memmove(cp, p->fts_name, p->fts_namelen + 1);
804 p->fts_info = fts_stat(sp, p, 0, _dirfd(dirp));
806 p->fts_accpath = p->fts_name;
807 p->fts_info = fts_stat(sp, p, 0, -1);
810 /* Decrement link count if applicable. */
811 if (nlinks > 0 && (p->fts_info == FTS_D ||
812 p->fts_info == FTS_DC || p->fts_info == FTS_DOT))
816 /* We walk in directory order so "ls -f" doesn't get upset. */
827 (void)closedir(dirp);
830 * If realloc() changed the address of the path, adjust the
831 * addresses for the rest of the tree and the dir list.
834 fts_padjust(sp, head);
837 * If not changing directories, reset the path back to original
840 if (ISSET(FTS_NOCHDIR))
841 sp->fts_path[cur->fts_pathlen] = '\0';
844 * If descended after called from fts_children or after called from
845 * fts_read and nothing found, get back. At the root level we use
846 * the saved fd; if one of fts_open()'s arguments is a relative path
847 * to an empty directory, we wind up here with no other way back. If
848 * can't get back, we're done.
850 if (descend && (type == BCHILD || !nitems) &&
851 (cur->fts_level == FTS_ROOTLEVEL ?
852 FCHDIR(sp, sp->fts_rfd) :
853 fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) {
854 cur->fts_info = FTS_ERR;
859 /* If didn't find anything, return NULL. */
862 cur->fts_info = FTS_DP;
866 /* Sort the entries. */
867 if (sp->fts_compar && nitems > 1)
868 head = fts_sort(sp, head, nitems);
873 fts_stat(FTS *sp, FTSENT *p, int follow, int dfd)
878 struct stat *sbp, sb;
883 path = p->fts_accpath, dfd = AT_FDCWD;
887 /* If user needs stat info, stat buffer already allocated. */
888 sbp = ISSET(FTS_NOSTAT) ? &sb : p->fts_statp;
891 /* Check for whiteout. */
892 if (p->fts_flags & FTS_ISW) {
894 memset(sbp, '\0', sizeof(*sbp));
895 sbp->st_mode = S_IFWHT;
902 * If doing a logical walk, or application requested FTS_FOLLOW, do
903 * a stat(2). If that fails, check for a non-existent symlink. If
904 * fail, set the errno from the stat call.
906 if (ISSET(FTS_LOGICAL) || follow) {
907 if (fstatat(dfd, path, sbp, 0)) {
909 if (fstatat(dfd, path, sbp, AT_SYMLINK_NOFOLLOW)) {
910 p->fts_errno = saved_errno;
914 if (S_ISLNK(sbp->st_mode))
917 } else if (fstatat(dfd, path, sbp, AT_SYMLINK_NOFOLLOW)) {
918 p->fts_errno = errno;
919 err: memset(sbp, 0, sizeof(struct stat));
923 if (S_ISDIR(sbp->st_mode)) {
925 * Set the device/inode. Used to find cycles and check for
926 * crossing mount points. Also remember the link count, used
927 * in fts_build to limit the number of stat calls. It is
928 * understood that these fields are only referenced if fts_info
931 dev = p->fts_dev = sbp->st_dev;
932 ino = p->fts_ino = sbp->st_ino;
933 p->fts_nlink = sbp->st_nlink;
935 if (ISDOT(p->fts_name))
939 * Cycle detection is done by brute force when the directory
940 * is first encountered. If the tree gets deep enough or the
941 * number of symbolic links to directories is high enough,
942 * something faster might be worthwhile.
944 for (t = p->fts_parent;
945 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent)
946 if (ino == t->fts_ino && dev == t->fts_dev) {
952 if (S_ISLNK(sbp->st_mode))
954 if (S_ISREG(sbp->st_mode))
956 return (FTS_DEFAULT);
960 * The comparison function takes pointers to pointers to FTSENT structures.
961 * Qsort wants a comparison function that takes pointers to void.
962 * (Both with appropriate levels of const-poisoning, of course!)
963 * Use a trampoline function to deal with the difference.
966 fts_compar(const void *a, const void *b)
970 parent = (*(const FTSENT * const *)a)->fts_fts;
971 return (*parent->fts_compar)(a, b);
975 fts_sort(FTS *sp, FTSENT *head, size_t nitems)
980 * Construct an array of pointers to the structures and call qsort(3).
981 * Reassemble the array in the order returned by qsort. If unable to
982 * sort for memory reasons, return the directory entries in their
983 * current order. Allocate enough space for the current needs plus
984 * 40 so don't realloc one entry at a time.
986 if (nitems > sp->fts_nitems) {
987 sp->fts_nitems = nitems + 40;
988 if ((sp->fts_array = reallocf(sp->fts_array,
989 sp->fts_nitems * sizeof(FTSENT *))) == NULL) {
994 for (ap = sp->fts_array, p = head; p; p = p->fts_link)
996 qsort(sp->fts_array, nitems, sizeof(FTSENT *), fts_compar);
997 for (head = *(ap = sp->fts_array); --nitems; ++ap)
998 ap[0]->fts_link = ap[1];
999 ap[0]->fts_link = NULL;
1004 fts_alloc(FTS *sp, char *name, size_t namelen)
1009 struct ftsent_withstat {
1011 struct stat statbuf;
1015 * The file name is a variable length array and no stat structure is
1016 * necessary if the user has set the nostat bit. Allocate the FTSENT
1017 * structure, the file name and the stat structure in one chunk, but
1018 * be careful that the stat structure is reasonably aligned.
1020 if (ISSET(FTS_NOSTAT))
1021 len = sizeof(FTSENT) + namelen + 1;
1023 len = sizeof(struct ftsent_withstat) + namelen + 1;
1025 if ((p = malloc(len)) == NULL)
1028 if (ISSET(FTS_NOSTAT)) {
1029 p->fts_name = (char *)(p + 1);
1030 p->fts_statp = NULL;
1032 p->fts_name = (char *)((struct ftsent_withstat *)p + 1);
1033 p->fts_statp = &((struct ftsent_withstat *)p)->statbuf;
1036 /* Copy the name and guarantee NUL termination. */
1037 memcpy(p->fts_name, name, namelen);
1038 p->fts_name[namelen] = '\0';
1039 p->fts_namelen = namelen;
1040 p->fts_path = sp->fts_path;
1043 p->fts_instr = FTS_NOINSTR;
1045 p->fts_pointer = NULL;
1051 fts_lfree(FTSENT *head)
1055 /* Free a linked list of structures. */
1056 while ((p = head)) {
1057 head = head->fts_link;
1063 * Allow essentially unlimited paths; find, rm, ls should all work on any tree.
1064 * Most systems will allow creation of paths much longer than MAXPATHLEN, even
1065 * though the kernel won't resolve them. Add the size (not just what's needed)
1066 * plus 256 bytes so don't realloc the path 2 bytes at a time.
1069 fts_palloc(FTS *sp, size_t more)
1072 sp->fts_pathlen += more + 256;
1073 sp->fts_path = reallocf(sp->fts_path, sp->fts_pathlen);
1074 return (sp->fts_path == NULL);
1078 * When the path is realloc'd, have to fix all of the pointers in structures
1082 fts_padjust(FTS *sp, FTSENT *head)
1085 char *addr = sp->fts_path;
1087 #define ADJUST(p) do { \
1088 if ((p)->fts_accpath != (p)->fts_name) { \
1089 (p)->fts_accpath = \
1090 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \
1092 (p)->fts_path = addr; \
1094 /* Adjust the current set of children. */
1095 for (p = sp->fts_child; p; p = p->fts_link)
1098 /* Adjust the rest of the tree, including the current level. */
1099 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) {
1101 p = p->fts_link ? p->fts_link : p->fts_parent;
1106 fts_maxarglen(char * const *argv)
1110 for (max = 0; *argv; ++argv)
1111 if ((len = strlen(*argv)) > max)
1117 * Change to dir specified by fd or p->fts_accpath without getting
1118 * tricked by someone changing the world out from underneath us.
1119 * Assumes p->fts_dev and p->fts_ino are filled in.
1122 fts_safe_changedir(FTS *sp, FTSENT *p, int fd, char *path)
1124 int ret, oerrno, newfd;
1128 if (ISSET(FTS_NOCHDIR))
1130 if (fd < 0 && (newfd = _open(path, O_RDONLY | O_DIRECTORY |
1133 if (_fstat(newfd, &sb)) {
1137 if (p->fts_dev != sb.st_dev || p->fts_ino != sb.st_ino) {
1138 errno = ENOENT; /* disinformation */
1142 ret = fchdir(newfd);
1146 (void)_close(newfd);
1152 * Check if the filesystem for "ent" has UFS-style links.
1155 fts_ufslinks(FTS *sp, const FTSENT *ent)
1157 struct _fts_private *priv;
1160 priv = (struct _fts_private *)sp;
1162 * If this node's device is different from the previous, grab
1163 * the filesystem information, and decide on the reliability
1164 * of the link information from this filesystem for stat(2)
1167 if (priv->ftsp_dev != ent->fts_dev) {
1168 if (statfs(ent->fts_path, &priv->ftsp_statfs) != -1) {
1169 priv->ftsp_dev = ent->fts_dev;
1170 priv->ftsp_linksreliable = 0;
1171 for (cpp = ufslike_filesystems; *cpp; cpp++) {
1172 if (strcmp(priv->ftsp_statfs.f_fstypename,
1174 priv->ftsp_linksreliable = 1;
1179 priv->ftsp_linksreliable = 0;
1182 return (priv->ftsp_linksreliable);