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>
52 #include "fts-compat.h"
53 #include "un-namespace.h"
55 #include "gen-private.h"
57 FTSENT *__fts_children_44bsd(FTS *, int);
58 int __fts_close_44bsd(FTS *);
59 void *__fts_get_clientptr_44bsd(FTS *);
60 FTS *__fts_get_stream_44bsd(FTSENT *);
61 FTS *__fts_open_44bsd(char * const *, int,
62 int (*)(const FTSENT * const *, const FTSENT * const *));
63 FTSENT *__fts_read_44bsd(FTS *);
64 int __fts_set_44bsd(FTS *, FTSENT *, int);
65 void __fts_set_clientptr_44bsd(FTS *, void *);
67 static FTSENT *fts_alloc(FTS *, char *, int);
68 static FTSENT *fts_build(FTS *, int);
69 static void fts_lfree(FTSENT *);
70 static void fts_load(FTS *, FTSENT *);
71 static size_t fts_maxarglen(char * const *);
72 static void fts_padjust(FTS *, FTSENT *);
73 static int fts_palloc(FTS *, size_t);
74 static FTSENT *fts_sort(FTS *, FTSENT *, int);
75 static u_short fts_stat(FTS *, FTSENT *, int);
76 static int fts_safe_changedir(FTS *, FTSENT *, int, char *);
77 static int fts_ufslinks(FTS *, const FTSENT *);
79 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2])))
81 #define CLR(opt) (sp->fts_options &= ~(opt))
82 #define ISSET(opt) (sp->fts_options & (opt))
83 #define SET(opt) (sp->fts_options |= (opt))
85 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd))
88 #define BCHILD 1 /* fts_children */
89 #define BNAMES 2 /* fts_children, names only */
90 #define BREAD 3 /* fts_read */
93 * Internal representation of an FTS, including extra implementation
94 * details. The FTS returned from fts_open points to this structure's
95 * ftsp_fts member (and can be cast to an _fts_private as required)
99 struct statfs ftsp_statfs;
101 int ftsp_linksreliable;
105 * The "FTS_NOSTAT" option can avoid a lot of calls to stat(2) if it
106 * knows that a directory could not possibly have subdirectories. This
107 * is decided by looking at the link count: a subdirectory would
108 * increment its parent's link count by virtue of its own ".." entry.
109 * This assumption only holds for UFS-like filesystems that implement
110 * links and directories this way, so we must punt for others.
113 static const char *ufslike_filesystems[] = {
123 __fts_open_44bsd(char * const *argv, int options,
124 int (*compar)(const FTSENT * const *, const FTSENT * const *))
126 struct _fts_private *priv;
130 FTSENT *parent, *tmp;
134 if (options & ~FTS_OPTIONMASK) {
139 /* Allocate/initialize the stream. */
140 if ((priv = calloc(1, sizeof(*priv))) == NULL)
142 sp = &priv->ftsp_fts;
143 sp->fts_compar = compar;
144 sp->fts_options = options;
149 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */
150 if (ISSET(FTS_LOGICAL))
154 * Start out with 1K of path space, and enough, in any case,
155 * to hold the user's paths.
157 if (fts_palloc(sp, MAX(fts_maxarglen(argv), MAXPATHLEN)))
160 /* Allocate/initialize root's parent. */
161 if ((parent = fts_alloc(sp, "", 0)) == NULL)
163 parent->fts_level = FTS_ROOTPARENTLEVEL;
165 /* Allocate/initialize root(s). */
166 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) {
167 /* Don't allow zero-length paths. */
168 if ((len = strlen(*argv)) == 0) {
173 p = fts_alloc(sp, *argv, len);
174 p->fts_level = FTS_ROOTLEVEL;
175 p->fts_parent = parent;
176 p->fts_accpath = p->fts_name;
177 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW));
179 /* Command-line "." and ".." are real directories. */
180 if (p->fts_info == FTS_DOT)
184 * If comparison routine supplied, traverse in sorted
185 * order; otherwise traverse in the order specified.
200 if (compar && nitems > 1)
201 root = fts_sort(sp, root, nitems);
204 * Allocate a dummy pointer and make fts_read think that we've just
205 * finished the node before the root(s); set p->fts_info to FTS_INIT
206 * so that everything about the "current" node is ignored.
208 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL)
210 sp->fts_cur->fts_link = root;
211 sp->fts_cur->fts_info = FTS_INIT;
214 * If using chdir(2), grab a file descriptor pointing to dot to ensure
215 * that we can get back here; this could be avoided for some paths,
216 * but almost certainly not worth the effort. Slashes, symbolic links,
217 * and ".." are all fairly nasty problems. Note, if we can't get the
218 * descriptor we run anyway, just more slowly.
220 if (!ISSET(FTS_NOCHDIR) &&
221 (sp->fts_rfd = _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
226 mem3: fts_lfree(root);
228 mem2: free(sp->fts_path);
234 fts_load(FTS *sp, FTSENT *p)
240 * Load the stream structure for the next traversal. Since we don't
241 * actually enter the directory until after the preorder visit, set
242 * the fts_accpath field specially so the chdir gets done to the right
243 * place and the user can access the first node. From fts_open it's
244 * known that the path will fit.
246 len = p->fts_pathlen = p->fts_namelen;
247 memmove(sp->fts_path, p->fts_name, len + 1);
248 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) {
250 memmove(p->fts_name, cp, len + 1);
251 p->fts_namelen = len;
253 p->fts_accpath = p->fts_path = sp->fts_path;
254 sp->fts_dev = p->fts_dev;
258 __fts_close_44bsd(FTS *sp)
264 * This still works if we haven't read anything -- the dummy structure
265 * points to the root list, so we step through to the end of the root
266 * list which has a valid parent pointer.
269 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) {
271 p = p->fts_link != NULL ? p->fts_link : p->fts_parent;
277 /* Free up child linked list, sort array, path buffer. */
279 fts_lfree(sp->fts_child);
284 /* Return to original directory, save errno if necessary. */
285 if (!ISSET(FTS_NOCHDIR)) {
286 saved_errno = fchdir(sp->fts_rfd) ? errno : 0;
287 (void)_close(sp->fts_rfd);
289 /* Set errno and return. */
290 if (saved_errno != 0) {
291 /* Free up the stream pointer. */
298 /* Free up the stream pointer. */
304 * Special case of "/" at the end of the path so that slashes aren't
305 * appended which would cause paths to be written as "....//foo".
308 (p->fts_path[p->fts_pathlen - 1] == '/' \
309 ? p->fts_pathlen - 1 : p->fts_pathlen)
312 __fts_read_44bsd(FTS *sp)
319 /* If finished or unrecoverable error, return NULL. */
320 if (sp->fts_cur == NULL || ISSET(FTS_STOP))
323 /* Set current node pointer. */
326 /* Save and zero out user instructions. */
327 instr = p->fts_instr;
328 p->fts_instr = FTS_NOINSTR;
330 /* Any type of file may be re-visited; re-stat and re-turn. */
331 if (instr == FTS_AGAIN) {
332 p->fts_info = fts_stat(sp, p, 0);
337 * Following a symlink -- SLNONE test allows application to see
338 * SLNONE and recover. If indirecting through a symlink, have
339 * keep a pointer to current location. If unable to get that
340 * pointer, follow fails.
342 if (instr == FTS_FOLLOW &&
343 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) {
344 p->fts_info = fts_stat(sp, p, 1);
345 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
346 if ((p->fts_symfd = _open(".", O_RDONLY | O_CLOEXEC,
348 p->fts_errno = errno;
349 p->fts_info = FTS_ERR;
351 p->fts_flags |= FTS_SYMFOLLOW;
356 /* Directory in pre-order. */
357 if (p->fts_info == FTS_D) {
358 /* If skipped or crossed mount point, do post-order visit. */
359 if (instr == FTS_SKIP ||
360 (ISSET(FTS_XDEV) && p->fts_dev != sp->fts_dev)) {
361 if (p->fts_flags & FTS_SYMFOLLOW)
362 (void)_close(p->fts_symfd);
364 fts_lfree(sp->fts_child);
365 sp->fts_child = NULL;
367 p->fts_info = FTS_DP;
371 /* Rebuild if only read the names and now traversing. */
372 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) {
374 fts_lfree(sp->fts_child);
375 sp->fts_child = NULL;
379 * Cd to the subdirectory.
381 * If have already read and now fail to chdir, whack the list
382 * to make the names come out right, and set the parent errno
383 * so the application will eventually get an error condition.
384 * Set the FTS_DONTCHDIR flag so that when we logically change
385 * directories back to the parent we don't do a chdir.
387 * If haven't read do so. If the read fails, fts_build sets
388 * FTS_STOP or the fts_info field of the node.
390 if (sp->fts_child != NULL) {
391 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) {
392 p->fts_errno = errno;
393 p->fts_flags |= FTS_DONTCHDIR;
394 for (p = sp->fts_child; p != NULL;
397 p->fts_parent->fts_accpath;
399 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) {
405 sp->fts_child = NULL;
409 /* Move to the next node on this level. */
411 if ((p = p->fts_link) != NULL) {
415 * If reached the top, return to the original directory (or
416 * the root of the tree), and load the paths for the next root.
418 if (p->fts_level == FTS_ROOTLEVEL) {
419 if (FCHDIR(sp, sp->fts_rfd)) {
424 return (sp->fts_cur = p);
428 * User may have called fts_set on the node. If skipped,
429 * ignore. If followed, get a file descriptor so we can
430 * get back if necessary.
432 if (p->fts_instr == FTS_SKIP)
434 if (p->fts_instr == FTS_FOLLOW) {
435 p->fts_info = fts_stat(sp, p, 1);
436 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) {
438 _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0) {
439 p->fts_errno = errno;
440 p->fts_info = FTS_ERR;
442 p->fts_flags |= FTS_SYMFOLLOW;
444 p->fts_instr = FTS_NOINSTR;
447 name: t = sp->fts_path + NAPPEND(p->fts_parent);
449 memmove(t, p->fts_name, p->fts_namelen + 1);
450 return (sp->fts_cur = p);
453 /* Move up to the parent node. */
457 if (p->fts_level == FTS_ROOTPARENTLEVEL) {
459 * Done; free everything up and set errno to 0 so the user
460 * can distinguish between error and EOF.
464 return (sp->fts_cur = NULL);
467 /* NUL terminate the pathname. */
468 sp->fts_path[p->fts_pathlen] = '\0';
471 * Return to the parent directory. If at a root node or came through
472 * a symlink, go back through the file descriptor. Otherwise, cd up
475 if (p->fts_level == FTS_ROOTLEVEL) {
476 if (FCHDIR(sp, sp->fts_rfd)) {
480 } else if (p->fts_flags & FTS_SYMFOLLOW) {
481 if (FCHDIR(sp, p->fts_symfd)) {
483 (void)_close(p->fts_symfd);
488 (void)_close(p->fts_symfd);
489 } else if (!(p->fts_flags & FTS_DONTCHDIR) &&
490 fts_safe_changedir(sp, p->fts_parent, -1, "..")) {
494 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP;
495 return (sp->fts_cur = p);
499 * Fts_set takes the stream as an argument although it's not used in this
500 * implementation; it would be necessary if anyone wanted to add global
501 * semantics to fts using fts_set. An error return is allowed for similar
506 __fts_set_44bsd(FTS *sp, FTSENT *p, int instr)
508 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW &&
509 instr != FTS_NOINSTR && instr != FTS_SKIP) {
513 p->fts_instr = instr;
518 __fts_children_44bsd(FTS *sp, int instr)
523 if (instr != 0 && instr != FTS_NAMEONLY) {
528 /* Set current node pointer. */
532 * Errno set to 0 so user can distinguish empty directory from
537 /* Fatal errors stop here. */
541 /* Return logical hierarchy of user's arguments. */
542 if (p->fts_info == FTS_INIT)
543 return (p->fts_link);
546 * If not a directory being visited in pre-order, stop here. Could
547 * allow FTS_DNR, assuming the user has fixed the problem, but the
548 * same effect is available with FTS_AGAIN.
550 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */)
553 /* Free up any previous child list. */
554 if (sp->fts_child != NULL)
555 fts_lfree(sp->fts_child);
557 if (instr == FTS_NAMEONLY) {
564 * If using chdir on a relative path and called BEFORE fts_read does
565 * its chdir to the root of a traversal, we can lose -- we need to
566 * chdir into the subdirectory, and we don't know where the current
567 * directory is, so we can't get back so that the upcoming chdir by
568 * fts_read will work.
570 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' ||
572 return (sp->fts_child = fts_build(sp, instr));
574 if ((fd = _open(".", O_RDONLY | O_CLOEXEC, 0)) < 0)
576 sp->fts_child = fts_build(sp, instr);
580 return (sp->fts_child);
583 #ifndef fts_get_clientptr
584 #error "fts_get_clientptr not defined"
588 (__fts_get_clientptr_44bsd)(FTS *sp)
591 return (fts_get_clientptr(sp));
594 #ifndef fts_get_stream
595 #error "fts_get_stream not defined"
599 (__fts_get_stream_44bsd)(FTSENT *p)
601 return (fts_get_stream(p));
605 __fts_set_clientptr_44bsd(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)
635 int cderrno, descend, len, level, maxlen, nlinks, oflag, saved_errno,
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, (int)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 if (len + dnamlen >= USHRT_MAX) {
776 * In an FTSENT, fts_pathlen is a u_short so it is
777 * possible to wraparound here. If we do, free up
778 * the current structure and the structures already
779 * allocated, then error out with ENAMETOOLONG.
783 (void)closedir(dirp);
784 cur->fts_info = FTS_ERR;
786 errno = ENAMETOOLONG;
789 p->fts_level = level;
790 p->fts_parent = sp->fts_cur;
791 p->fts_pathlen = len + dnamlen;
794 if (dp->d_type == DT_WHT)
795 p->fts_flags |= FTS_ISW;
800 p->fts_info = FTS_NS;
801 p->fts_errno = cderrno;
803 p->fts_info = FTS_NSOK;
804 p->fts_accpath = cur->fts_accpath;
805 } else if (nlinks == 0
808 dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN)
812 ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name;
813 p->fts_info = FTS_NSOK;
815 /* Build a file name for fts_stat to stat. */
816 if (ISSET(FTS_NOCHDIR)) {
817 p->fts_accpath = p->fts_path;
818 memmove(cp, p->fts_name, p->fts_namelen + 1);
820 p->fts_accpath = p->fts_name;
822 p->fts_info = fts_stat(sp, p, 0);
824 /* Decrement link count if applicable. */
825 if (nlinks > 0 && (p->fts_info == FTS_D ||
826 p->fts_info == FTS_DC || p->fts_info == FTS_DOT))
830 /* We walk in directory order so "ls -f" doesn't get upset. */
841 (void)closedir(dirp);
844 * If realloc() changed the address of the path, adjust the
845 * addresses for the rest of the tree and the dir list.
848 fts_padjust(sp, head);
851 * If not changing directories, reset the path back to original
854 if (ISSET(FTS_NOCHDIR)) {
855 if (len == sp->fts_pathlen || nitems == 0)
861 * If descended after called from fts_children or after called from
862 * fts_read and nothing found, get back. At the root level we use
863 * the saved fd; if one of fts_open()'s arguments is a relative path
864 * to an empty directory, we wind up here with no other way back. If
865 * can't get back, we're done.
867 if (descend && (type == BCHILD || !nitems) &&
868 (cur->fts_level == FTS_ROOTLEVEL ?
869 FCHDIR(sp, sp->fts_rfd) :
870 fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) {
871 cur->fts_info = FTS_ERR;
876 /* If didn't find anything, return NULL. */
879 cur->fts_info = FTS_DP;
883 /* Sort the entries. */
884 if (sp->fts_compar && nitems > 1)
885 head = fts_sort(sp, head, nitems);
890 fts_stat(FTS *sp, FTSENT *p, int follow)
895 struct stat *sbp, sb;
898 /* If user needs stat info, stat buffer already allocated. */
899 sbp = ISSET(FTS_NOSTAT) ? &sb : p->fts_statp;
902 /* Check for whiteout. */
903 if (p->fts_flags & FTS_ISW) {
905 memset(sbp, '\0', sizeof(*sbp));
906 sbp->st_mode = S_IFWHT;
913 * If doing a logical walk, or application requested FTS_FOLLOW, do
914 * a stat(2). If that fails, check for a non-existent symlink. If
915 * fail, set the errno from the stat call.
917 if (ISSET(FTS_LOGICAL) || follow) {
918 if (stat(p->fts_accpath, sbp)) {
920 if (!lstat(p->fts_accpath, sbp)) {
924 p->fts_errno = saved_errno;
927 } else if (lstat(p->fts_accpath, sbp)) {
928 p->fts_errno = errno;
929 err: memset(sbp, 0, sizeof(struct stat));
933 if (S_ISDIR(sbp->st_mode)) {
935 * Set the device/inode. Used to find cycles and check for
936 * crossing mount points. Also remember the link count, used
937 * in fts_build to limit the number of stat calls. It is
938 * understood that these fields are only referenced if fts_info
941 dev = p->fts_dev = sbp->st_dev;
942 ino = p->fts_ino = sbp->st_ino;
943 p->fts_nlink = sbp->st_nlink;
945 if (ISDOT(p->fts_name))
949 * Cycle detection is done by brute force when the directory
950 * is first encountered. If the tree gets deep enough or the
951 * number of symbolic links to directories is high enough,
952 * something faster might be worthwhile.
954 for (t = p->fts_parent;
955 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent)
956 if (ino == t->fts_ino && dev == t->fts_dev) {
962 if (S_ISLNK(sbp->st_mode))
964 if (S_ISREG(sbp->st_mode))
966 return (FTS_DEFAULT);
970 * The comparison function takes pointers to pointers to FTSENT structures.
971 * Qsort wants a comparison function that takes pointers to void.
972 * (Both with appropriate levels of const-poisoning, of course!)
973 * Use a trampoline function to deal with the difference.
976 fts_compar(const void *a, const void *b)
980 parent = (*(const FTSENT * const *)a)->fts_fts;
981 return (*parent->fts_compar)(a, b);
985 fts_sort(FTS *sp, FTSENT *head, int nitems)
990 * Construct an array of pointers to the structures and call qsort(3).
991 * Reassemble the array in the order returned by qsort. If unable to
992 * sort for memory reasons, return the directory entries in their
993 * current order. Allocate enough space for the current needs plus
994 * 40 so don't realloc one entry at a time.
996 if (nitems > sp->fts_nitems) {
997 sp->fts_nitems = nitems + 40;
998 if ((sp->fts_array = reallocf(sp->fts_array,
999 sp->fts_nitems * sizeof(FTSENT *))) == NULL) {
1004 for (ap = sp->fts_array, p = head; p; p = p->fts_link)
1006 qsort(sp->fts_array, nitems, sizeof(FTSENT *), fts_compar);
1007 for (head = *(ap = sp->fts_array); --nitems; ++ap)
1008 ap[0]->fts_link = ap[1];
1009 ap[0]->fts_link = NULL;
1014 fts_alloc(FTS *sp, char *name, int namelen)
1019 struct ftsent_withstat {
1021 struct stat statbuf;
1025 * The file name is a variable length array and no stat structure is
1026 * necessary if the user has set the nostat bit. Allocate the FTSENT
1027 * structure, the file name and the stat structure in one chunk, but
1028 * be careful that the stat structure is reasonably aligned.
1030 if (ISSET(FTS_NOSTAT))
1031 len = sizeof(FTSENT) + namelen + 1;
1033 len = sizeof(struct ftsent_withstat) + namelen + 1;
1035 if ((p = malloc(len)) == NULL)
1038 if (ISSET(FTS_NOSTAT)) {
1039 p->fts_name = (char *)(p + 1);
1040 p->fts_statp = NULL;
1042 p->fts_name = (char *)((struct ftsent_withstat *)p + 1);
1043 p->fts_statp = &((struct ftsent_withstat *)p)->statbuf;
1046 /* Copy the name and guarantee NUL termination. */
1047 memcpy(p->fts_name, name, namelen);
1048 p->fts_name[namelen] = '\0';
1049 p->fts_namelen = namelen;
1050 p->fts_path = sp->fts_path;
1053 p->fts_instr = FTS_NOINSTR;
1055 p->fts_pointer = NULL;
1061 fts_lfree(FTSENT *head)
1065 /* Free a linked list of structures. */
1066 while ((p = head)) {
1067 head = head->fts_link;
1073 * Allow essentially unlimited paths; find, rm, ls should all work on any tree.
1074 * Most systems will allow creation of paths much longer than MAXPATHLEN, even
1075 * though the kernel won't resolve them. Add the size (not just what's needed)
1076 * plus 256 bytes so don't realloc the path 2 bytes at a time.
1079 fts_palloc(FTS *sp, size_t more)
1082 sp->fts_pathlen += more + 256;
1084 * Check for possible wraparound. In an FTS, fts_pathlen is
1085 * a signed int but in an FTSENT it is an unsigned short.
1086 * We limit fts_pathlen to USHRT_MAX to be safe in both cases.
1088 if (sp->fts_pathlen < 0 || sp->fts_pathlen >= USHRT_MAX) {
1091 sp->fts_path = NULL;
1092 errno = ENAMETOOLONG;
1095 sp->fts_path = reallocf(sp->fts_path, sp->fts_pathlen);
1096 return (sp->fts_path == NULL);
1100 * When the path is realloc'd, have to fix all of the pointers in structures
1104 fts_padjust(FTS *sp, FTSENT *head)
1107 char *addr = sp->fts_path;
1109 #define ADJUST(p) do { \
1110 if ((p)->fts_accpath != (p)->fts_name) { \
1111 (p)->fts_accpath = \
1112 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \
1114 (p)->fts_path = addr; \
1116 /* Adjust the current set of children. */
1117 for (p = sp->fts_child; p; p = p->fts_link)
1120 /* Adjust the rest of the tree, including the current level. */
1121 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) {
1123 p = p->fts_link ? p->fts_link : p->fts_parent;
1128 fts_maxarglen(char * const *argv)
1132 for (max = 0; *argv; ++argv)
1133 if ((len = strlen(*argv)) > max)
1139 * Change to dir specified by fd or p->fts_accpath without getting
1140 * tricked by someone changing the world out from underneath us.
1141 * Assumes p->fts_dev and p->fts_ino are filled in.
1144 fts_safe_changedir(FTS *sp, FTSENT *p, int fd, char *path)
1146 int ret, oerrno, newfd;
1150 if (ISSET(FTS_NOCHDIR))
1152 if (fd < 0 && (newfd = _open(path, O_RDONLY | O_CLOEXEC, 0)) < 0)
1154 if (_fstat(newfd, &sb)) {
1158 if (p->fts_dev != sb.st_dev || p->fts_ino != sb.st_ino) {
1159 errno = ENOENT; /* disinformation */
1163 ret = fchdir(newfd);
1167 (void)_close(newfd);
1173 * Check if the filesystem for "ent" has UFS-style links.
1176 fts_ufslinks(FTS *sp, const FTSENT *ent)
1178 struct _fts_private *priv;
1181 priv = (struct _fts_private *)sp;
1183 * If this node's device is different from the previous, grab
1184 * the filesystem information, and decide on the reliability
1185 * of the link information from this filesystem for stat(2)
1188 if (priv->ftsp_dev != ent->fts_dev) {
1189 if (statfs(ent->fts_path, &priv->ftsp_statfs) != -1) {
1190 priv->ftsp_dev = ent->fts_dev;
1191 priv->ftsp_linksreliable = 0;
1192 for (cpp = ufslike_filesystems; *cpp; cpp++) {
1193 if (strcmp(priv->ftsp_statfs.f_fstypename,
1195 priv->ftsp_linksreliable = 1;
1200 priv->ftsp_linksreliable = 0;
1203 return (priv->ftsp_linksreliable);
1206 __sym_compat(fts_open, __fts_open_44bsd, FBSD_1.0);
1207 __sym_compat(fts_close, __fts_close_44bsd, FBSD_1.0);
1208 __sym_compat(fts_read, __fts_read_44bsd, FBSD_1.0);
1209 __sym_compat(fts_set, __fts_set_44bsd, FBSD_1.0);
1210 __sym_compat(fts_children, __fts_children_44bsd, FBSD_1.0);
1211 __sym_compat(fts_get_clientptr, __fts_get_clientptr_44bsd, FBSD_1.0);
1212 __sym_compat(fts_get_stream, __fts_get_stream_44bsd, FBSD_1.0);
1213 __sym_compat(fts_set_clientptr, __fts_set_clientptr_44bsd, FBSD_1.0);