Mercurial > gnulib
annotate lib/fts.c @ 7151:43e3888c56c4
Update from coreutils.
* lib/__fpending.h: Add copyright notice.
* lib/fprintftime.h: Likewise.
* lib/savedir.c: Use (C) in copyright notice.
* lib/savedir.h: Likewise.
2006-08-15 Jim Meyering <jim@meyering.net>
* lib/at-func.c: New file, with the logic of all emulated at-functions.
* lib/openat-priv.h: Include <errno.h> and define ENOSYS,
in support of the EXPECTED_ERRNO macro.
* lib/openat.c (fstatat, unlinkat, fchownat): Remove function definitions.
Instead, define the appropriate symbols and include "at-func.c".
* lib/mkdirat.c (mkdirat): Likewise.
* lib/fchmodat.c (fchmodat): Likewise.
(ENOSYS): Remove definition.
* lib/openat.c: Don't include <errno.h>, now that "openat-priv.h" does it.
Don't include "unistd--.h" -- it wasn't ever used.
2006-01-17 Jim Meyering <jim@meyering.net>
Rewrite fts.c not to change the current working directory,
by using openat, fstatat, fdopendir, etc..
* lib/fts.c [! _LIBC]: Include "openat.h" and "unistd--.h".
(HAVE_OPENAT_SUPPORT): Define.
[_LIBC] (fchdir): Don't undef or define; no longer used.
(FCHDIR): Define in terms of cwd_advance_fd rather than fchdir.
Now, this `function' always succeeds, and consumes its file descriptor
parameter -- so callers must not close such FDs. Update callers.
(diropen_fd, opendirat, cwd_advance_fd): New functions.
(diropen): Add parameter, SP. Adjust all callers.
Implement using diropen_fd, rather than open.
(fts_open): Initialize new member, fts_cwd_fd.
Remove fts_rft-setting code.
(fts_close): Close fts_cwd_fd, if necessary.
(__opendir2): Define in terms of opendir or opendirat,
depending on whether the FST_NOCHDIR flag is set.
(fts_build): Since fts_safe_changedir consumes its FD, and since
this code must do `closedir(dirp)', dup the dirfd(dirp) argument,
and close the dup'd file descriptor upon failure.
(fts_stat): Use fstatat(...AT_SYMLINK_NOFOLLOW) in place of lstat.
(fts_safe_changedir): Tweak semantics to reflect that this function
now calls cwd_advance_fd and hence consumes its FD argument.
* lib/fts_.h [struct FTS] (fts_cwd_fd): New member.
[struct FTS] (fts_rft): Remove now-unused member.
[struct FTS] (fts_cycle.state): Improve comment.
* lib/openat.c (openat_needs_fchdir): New function.
* lib/openat.h (openat_needs_fchdir): Declare it.
2006-08-15 Jim Meyering <jim@meyering.net>
* m4/openat.m4 (gl_FUNC_OPENAT): Add at-func.c via AC_LIBSOURCES.
2006-01-17 Jim Meyering <jim@meyering.net>
* m4/fts.m4 (gl_FUNC_FTS_CORE): Depend on gl_FUNC_OPENAT.
2006-01-11 Jim Meyering <jim@meyering.net>
* m4/openat.m4 (gl_FUNC_OPENAT): Require and compile fchmodat.c.
Check for the lchmod function.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Thu, 17 Aug 2006 20:34:21 +0000 |
parents | 96af1224c6fa |
children | 3307ae6ea2e5 |
rev | line source |
---|---|
5858 | 1 /* Traverse a file hierarchy. |
2 | |
6527 | 3 Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. |
5858 | 4 |
5 This program is free software; you can redistribute it and/or modify | |
6 it under the terms of the GNU General Public License as published by | |
7 the Free Software Foundation; either version 2, or (at your option) | |
8 any later version. | |
9 | |
10 This program is distributed in the hope that it will be useful, | |
11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
13 GNU General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU General Public License | |
16 along with this program; if not, write to the Free Software Foundation, | |
17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
18 | |
19 /*- | |
20 * Copyright (c) 1990, 1993, 1994 | |
21 * The Regents of the University of California. All rights reserved. | |
22 * | |
23 * Redistribution and use in source and binary forms, with or without | |
24 * modification, are permitted provided that the following conditions | |
25 * are met: | |
26 * 1. Redistributions of source code must retain the above copyright | |
27 * notice, this list of conditions and the following disclaimer. | |
28 * 2. Redistributions in binary form must reproduce the above copyright | |
29 * notice, this list of conditions and the following disclaimer in the | |
30 * documentation and/or other materials provided with the distribution. | |
31 * 4. Neither the name of the University nor the names of its contributors | |
32 * may be used to endorse or promote products derived from this software | |
33 * without specific prior written permission. | |
34 * | |
35 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
38 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
45 * SUCH DAMAGE. | |
46 */ | |
47 | |
48 #ifdef HAVE_CONFIG_H | |
49 # include <config.h> | |
50 #endif | |
51 | |
52 #if defined(LIBC_SCCS) && !defined(lint) | |
53 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; | |
54 #endif /* LIBC_SCCS and not lint */ | |
55 | |
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* fts.c: Include fts_.h first, to check interface.
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56 #include "fts_.h" |
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57 |
5858 | 58 #if HAVE_SYS_PARAM_H || defined _LIBC |
59 # include <sys/param.h> | |
60 #endif | |
61 #ifdef _LIBC | |
62 # include <include/sys/stat.h> | |
63 #else | |
64 # include <sys/stat.h> | |
65 #endif | |
66 #include <fcntl.h> | |
67 #include <errno.h> | |
68 #include "dirfd.h" | |
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69 #include <stdbool.h> |
5858 | 70 #include <stdlib.h> |
71 #include <string.h> | |
72 #include <unistd.h> | |
73 | |
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74 #if ! _LIBC |
7151 | 75 # include "fcntl--.h" |
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76 # include "lstat.h" |
7151 | 77 # include "openat.h" |
78 # include "unistd--.h" | |
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79 #endif |
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80 |
6949
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81 #include <dirent.h> |
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82 #ifndef _D_EXACT_NAMLEN |
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83 # define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name) |
5858 | 84 #endif |
85 | |
86 #ifdef _LIBC | |
87 # undef close | |
88 # define close __close | |
89 # undef closedir | |
90 # define closedir __closedir | |
91 # undef fchdir | |
92 # define fchdir __fchdir | |
93 # undef open | |
94 # define open __open | |
95 # undef opendir | |
96 # define opendir __opendir | |
97 # undef readdir | |
98 # define readdir __readdir | |
99 #else | |
100 # undef internal_function | |
101 # define internal_function /* empty */ | |
102 #endif | |
103 | |
104 #ifndef __set_errno | |
105 # define __set_errno(Val) errno = (Val) | |
106 #endif | |
107 | |
108 #ifndef __attribute__ | |
109 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ | |
110 # define __attribute__(x) /* empty */ | |
111 # endif | |
112 #endif | |
113 | |
114 #ifndef ATTRIBUTE_UNUSED | |
115 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
116 #endif | |
117 | |
7151 | 118 #if !defined O_NOFOLLOW |
119 # define O_NOFOLLOW 0 | |
120 #endif | |
121 | |
122 /* If this host provides the openat function, then we can avoid | |
123 attempting to open "." in some initialization code below. */ | |
124 #ifdef HAVE_OPENAT | |
125 # define HAVE_OPENAT_SUPPORT 1 | |
126 #else | |
127 # define HAVE_OPENAT_SUPPORT 0 | |
128 #endif | |
5858 | 129 |
130 static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; | |
131 static FTSENT *fts_build (FTS *, int) internal_function; | |
132 static void fts_lfree (FTSENT *) internal_function; | |
133 static void fts_load (FTS *, FTSENT *) internal_function; | |
134 static size_t fts_maxarglen (char * const *) internal_function; | |
135 static void fts_padjust (FTS *, FTSENT *) internal_function; | |
136 static bool fts_palloc (FTS *, size_t) internal_function; | |
137 static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; | |
138 static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; | |
139 static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) | |
140 internal_function; | |
141 | |
5872 | 142 #if _LGPL_PACKAGE |
143 static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } | |
144 static void leave_dir (FTS *fts, FTSENT *ent) {} | |
145 static bool setup_dir (FTS *fts) { return true; } | |
146 static void free_dir (FTS *fts) {} | |
147 #else | |
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148 # include "fcntl--.h" |
5872 | 149 # include "fts-cycle.c" |
150 #endif | |
151 | |
5858 | 152 #ifndef MAX |
153 # define MAX(a,b) ((a) > (b) ? (a) : (b)) | |
154 #endif | |
155 | |
156 #ifndef SIZE_MAX | |
157 # define SIZE_MAX ((size_t) -1) | |
158 #endif | |
159 | |
160 #ifndef O_DIRECTORY | |
161 # define O_DIRECTORY 0 | |
162 #endif | |
163 | |
164 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2]))) | |
7151 | 165 #define STREQ(a, b) (strcmp ((a), (b)) == 0) |
5858 | 166 |
167 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
168 #define ISSET(opt) (sp->fts_options & (opt)) | |
169 #define SET(opt) (sp->fts_options |= (opt)) | |
170 | |
7151 | 171 #define RESTORE_INITIAL_CWD(sp) FCHDIR (sp, (ISSET (FTS_CWDFD) \ |
172 ? AT_FDCWD \ | |
173 : sp->fts_rfd)) | |
174 | |
175 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) \ | |
176 && (ISSET(FTS_CWDFD) \ | |
177 ? (cwd_advance_fd (sp, fd), 0) \ | |
178 : fchdir(fd))) | |
179 | |
5858 | 180 |
181 /* fts_build flags */ | |
182 #define BCHILD 1 /* fts_children */ | |
183 #define BNAMES 2 /* fts_children, names only */ | |
184 #define BREAD 3 /* fts_read */ | |
185 | |
186 #if FTS_DEBUG | |
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187 # include <inttypes.h> |
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188 # include <stdint.h> |
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189 # include <stdio.h> |
5858 | 190 bool fts_debug = false; |
191 # define Dprintf(x) do { if (fts_debug) printf x; } while (0) | |
192 #else | |
193 # define Dprintf(x) | |
194 #endif | |
195 | |
196 #define LEAVE_DIR(Fts, Ent, Tag) \ | |
5872 | 197 do \ |
198 { \ | |
5858 | 199 Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ |
5872 | 200 leave_dir (Fts, Ent); \ |
201 } \ | |
202 while (false) | |
5858 | 203 |
7151 | 204 /* file-descriptor-relative opendir. */ |
205 /* FIXME: if others need this function, move it into lib/openat.c */ | |
206 static inline DIR * | |
207 internal_function | |
208 opendirat (int fd, char const *dir) | |
209 { | |
210 int new_fd = openat (fd, dir, O_RDONLY); | |
211 DIR *dirp; | |
212 | |
213 if (new_fd < 0) | |
214 return NULL; | |
215 dirp = fdopendir (new_fd); | |
216 if (dirp == NULL) | |
217 { | |
218 int saved_errno = errno; | |
219 close (new_fd); | |
220 errno = saved_errno; | |
221 } | |
222 return dirp; | |
223 } | |
224 | |
225 /* Virtual fchdir. Advance SP's working directory | |
226 file descriptor, SP->fts_cwd_fd, to FD, and close | |
227 the previous one, ignoring any error. */ | |
228 static void | |
229 internal_function | |
230 cwd_advance_fd (FTS *sp, int fd) | |
231 { | |
232 int old = sp->fts_cwd_fd; | |
233 if (old == fd && old != AT_FDCWD) | |
234 abort (); | |
235 sp->fts_cwd_fd = fd; | |
236 if (0 <= old) | |
237 close (old); /* ignore any close failure */ | |
238 } | |
239 | |
5858 | 240 /* Open the directory DIR if possible, and return a file |
241 descriptor. Return -1 and set errno on failure. It doesn't matter | |
242 whether the file descriptor has read or write access. */ | |
243 | |
7151 | 244 static inline int |
5858 | 245 internal_function |
7151 | 246 diropen (FTS const *sp, char const *dir) |
5858 | 247 { |
7151 | 248 int open_flags = (O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK |
249 | (ISSET (FTS_PHYSICAL) ? O_NOFOLLOW : 0)); | |
250 | |
251 return (ISSET (FTS_CWDFD) | |
252 ? openat (sp->fts_cwd_fd, dir, open_flags) | |
253 : open (dir, open_flags)); | |
5858 | 254 } |
255 | |
256 FTS * | |
257 fts_open (char * const *argv, | |
258 register int options, | |
259 int (*compar) (FTSENT const **, FTSENT const **)) | |
260 { | |
261 register FTS *sp; | |
262 register FTSENT *p, *root; | |
263 register size_t nitems; | |
7151 | 264 FTSENT *parent = NULL; |
265 FTSENT *tmp = NULL; /* pacify gcc */ | |
5858 | 266 size_t len; |
267 | |
268 /* Options check. */ | |
269 if (options & ~FTS_OPTIONMASK) { | |
270 __set_errno (EINVAL); | |
271 return (NULL); | |
272 } | |
7151 | 273 if ((options & FTS_NOCHDIR) && (options & FTS_CWDFD)) { |
274 __set_errno (EINVAL); | |
275 return (NULL); | |
276 } | |
277 if ( ! (options & (FTS_LOGICAL | FTS_PHYSICAL))) { | |
278 __set_errno (EINVAL); | |
279 return (NULL); | |
280 } | |
5858 | 281 |
282 /* Allocate/initialize the stream */ | |
283 if ((sp = malloc(sizeof(FTS))) == NULL) | |
284 return (NULL); | |
285 memset(sp, 0, sizeof(FTS)); | |
286 sp->fts_compar = compar; | |
287 sp->fts_options = options; | |
288 | |
289 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
7151 | 290 if (ISSET(FTS_LOGICAL)) { |
5858 | 291 SET(FTS_NOCHDIR); |
7151 | 292 CLR(FTS_CWDFD); |
293 } | |
294 | |
295 /* Initialize fts_cwd_fd. */ | |
296 sp->fts_cwd_fd = AT_FDCWD; | |
297 if ( ISSET(FTS_CWDFD) && ! HAVE_OPENAT_SUPPORT) | |
298 { | |
299 /* While it isn't technically necessary to open "." this | |
300 early, doing it here saves us the trouble of ensuring | |
301 later (where it'd be messier) that "." can in fact | |
302 be opened. If not, revert to FTS_NOCHDIR mode. */ | |
303 int fd = open (".", O_RDONLY); | |
304 if (fd < 0) | |
305 { | |
306 /* Even if `.' is unreadable, don't revert to FTS_NOCHDIR mode | |
307 on systems like Linux+PROC_FS, where our openat emulation | |
308 is good enough. Note: on a system that emulates | |
309 openat via /proc, this technique can still fail, but | |
310 only in extreme conditions, e.g., when the working | |
311 directory cannot be saved (i.e. save_cwd fails) -- | |
312 and that happens only on Linux only when "." is unreadable | |
313 and the CWD would be longer than PATH_MAX. | |
314 FIXME: once Linux kernel openat support is well established, | |
315 replace the above open call and this entire if/else block | |
316 with the body of the if-block below. */ | |
317 if ( openat_needs_fchdir ()) | |
318 { | |
319 SET(FTS_NOCHDIR); | |
320 CLR(FTS_CWDFD); | |
321 } | |
322 } | |
323 else | |
324 { | |
325 close (fd); | |
326 } | |
327 } | |
5858 | 328 |
329 /* | |
5907 | 330 * Start out with 1K of file name space, and enough, in any case, |
331 * to hold the user's file names. | |
5858 | 332 */ |
333 #ifndef MAXPATHLEN | |
334 # define MAXPATHLEN 1024 | |
335 #endif | |
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336 { |
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337 size_t maxarglen = fts_maxarglen(argv); |
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338 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
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339 goto mem1; |
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340 } |
5858 | 341 |
342 /* Allocate/initialize root's parent. */ | |
7151 | 343 if (*argv != NULL) { |
344 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
345 goto mem2; | |
346 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
347 } | |
5858 | 348 |
349 /* Allocate/initialize root(s). */ | |
350 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
5907 | 351 /* Don't allow zero-length file names. */ |
5858 | 352 if ((len = strlen(*argv)) == 0) { |
353 __set_errno (ENOENT); | |
354 goto mem3; | |
355 } | |
356 | |
357 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
358 goto mem3; | |
359 p->fts_level = FTS_ROOTLEVEL; | |
360 p->fts_parent = parent; | |
361 p->fts_accpath = p->fts_name; | |
362 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW) != 0); | |
363 | |
364 /* Command-line "." and ".." are real directories. */ | |
365 if (p->fts_info == FTS_DOT) | |
366 p->fts_info = FTS_D; | |
367 | |
368 /* | |
369 * If comparison routine supplied, traverse in sorted | |
370 * order; otherwise traverse in the order specified. | |
371 */ | |
372 if (compar) { | |
373 p->fts_link = root; | |
374 root = p; | |
375 } else { | |
376 p->fts_link = NULL; | |
377 if (root == NULL) | |
378 tmp = root = p; | |
379 else { | |
380 tmp->fts_link = p; | |
381 tmp = p; | |
382 } | |
383 } | |
384 } | |
385 if (compar && nitems > 1) | |
386 root = fts_sort(sp, root, nitems); | |
387 | |
388 /* | |
389 * Allocate a dummy pointer and make fts_read think that we've just | |
390 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
391 * so that everything about the "current" node is ignored. | |
392 */ | |
393 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
394 goto mem3; | |
395 sp->fts_cur->fts_link = root; | |
396 sp->fts_cur->fts_info = FTS_INIT; | |
5872 | 397 if (! setup_dir (sp)) |
398 goto mem3; | |
5858 | 399 |
400 /* | |
401 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
5907 | 402 * that we can get back here; this could be avoided for some file names, |
5858 | 403 * but almost certainly not worth the effort. Slashes, symbolic links, |
404 * and ".." are all fairly nasty problems. Note, if we can't get the | |
405 * descriptor we run anyway, just more slowly. | |
406 */ | |
7151 | 407 if (!ISSET(FTS_NOCHDIR) && !ISSET(FTS_CWDFD) |
408 && (sp->fts_rfd = diropen (sp, ".")) < 0) | |
5858 | 409 SET(FTS_NOCHDIR); |
410 | |
411 return (sp); | |
412 | |
413 mem3: fts_lfree(root); | |
414 free(parent); | |
415 mem2: free(sp->fts_path); | |
416 mem1: free(sp); | |
417 return (NULL); | |
418 } | |
419 | |
420 static void | |
421 internal_function | |
422 fts_load (FTS *sp, register FTSENT *p) | |
423 { | |
424 register size_t len; | |
425 register char *cp; | |
426 | |
427 /* | |
428 * Load the stream structure for the next traversal. Since we don't | |
429 * actually enter the directory until after the preorder visit, set | |
430 * the fts_accpath field specially so the chdir gets done to the right | |
431 * place and the user can access the first node. From fts_open it's | |
5907 | 432 * known that the file name will fit. |
5858 | 433 */ |
434 len = p->fts_pathlen = p->fts_namelen; | |
435 memmove(sp->fts_path, p->fts_name, len + 1); | |
436 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
437 len = strlen(++cp); | |
438 memmove(p->fts_name, cp, len + 1); | |
439 p->fts_namelen = len; | |
440 } | |
441 p->fts_accpath = p->fts_path = sp->fts_path; | |
442 sp->fts_dev = p->fts_statp->st_dev; | |
443 } | |
444 | |
445 int | |
446 fts_close (FTS *sp) | |
447 { | |
448 register FTSENT *freep, *p; | |
449 int saved_errno = 0; | |
450 | |
451 /* | |
452 * This still works if we haven't read anything -- the dummy structure | |
453 * points to the root list, so we step through to the end of the root | |
454 * list which has a valid parent pointer. | |
455 */ | |
456 if (sp->fts_cur) { | |
457 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
458 freep = p; | |
459 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
460 free(freep); | |
461 } | |
462 free(p); | |
463 } | |
464 | |
5907 | 465 /* Free up child linked list, sort array, file name buffer. */ |
5858 | 466 if (sp->fts_child) |
467 fts_lfree(sp->fts_child); | |
468 if (sp->fts_array) | |
469 free(sp->fts_array); | |
470 free(sp->fts_path); | |
471 | |
7151 | 472 if (ISSET(FTS_CWDFD)) |
473 { | |
474 if (0 <= sp->fts_cwd_fd) | |
475 close (sp->fts_cwd_fd); | |
476 } | |
477 else if (!ISSET(FTS_NOCHDIR)) | |
478 { | |
479 /* Return to original directory, save errno if necessary. */ | |
480 if (fchdir(sp->fts_rfd)) | |
481 saved_errno = errno; | |
482 close(sp->fts_rfd); | |
483 } | |
5858 | 484 |
5872 | 485 free_dir (sp); |
5858 | 486 |
487 /* Free up the stream pointer. */ | |
488 free(sp); | |
489 | |
490 /* Set errno and return. */ | |
491 if (saved_errno) { | |
492 __set_errno (saved_errno); | |
493 return (-1); | |
494 } | |
495 | |
496 return (0); | |
497 } | |
498 | |
499 /* | |
5907 | 500 * Special case of "/" at the end of the file name so that slashes aren't |
501 * appended which would cause file names to be written as "....//foo". | |
5858 | 502 */ |
503 #define NAPPEND(p) \ | |
504 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
505 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
506 | |
507 FTSENT * | |
508 fts_read (register FTS *sp) | |
509 { | |
510 register FTSENT *p, *tmp; | |
511 register unsigned short int instr; | |
512 register char *t; | |
513 | |
514 /* If finished or unrecoverable error, return NULL. */ | |
515 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
516 return (NULL); | |
517 | |
518 /* Set current node pointer. */ | |
519 p = sp->fts_cur; | |
520 | |
521 /* Save and zero out user instructions. */ | |
522 instr = p->fts_instr; | |
523 p->fts_instr = FTS_NOINSTR; | |
524 | |
525 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
526 if (instr == FTS_AGAIN) { | |
527 p->fts_info = fts_stat(sp, p, false); | |
528 return (p); | |
529 } | |
530 Dprintf (("fts_read: p=%s\n", | |
531 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
532 | |
533 /* | |
534 * Following a symlink -- SLNONE test allows application to see | |
535 * SLNONE and recover. If indirecting through a symlink, have | |
536 * keep a pointer to current location. If unable to get that | |
537 * pointer, follow fails. | |
538 */ | |
539 if (instr == FTS_FOLLOW && | |
540 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
541 p->fts_info = fts_stat(sp, p, true); | |
542 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
7151 | 543 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
5858 | 544 p->fts_errno = errno; |
545 p->fts_info = FTS_ERR; | |
546 } else | |
547 p->fts_flags |= FTS_SYMFOLLOW; | |
548 } | |
5872 | 549 goto check_for_dir; |
5858 | 550 } |
551 | |
552 /* Directory in pre-order. */ | |
553 if (p->fts_info == FTS_D) { | |
554 /* If skipped or crossed mount point, do post-order visit. */ | |
555 if (instr == FTS_SKIP || | |
556 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
557 if (p->fts_flags & FTS_SYMFOLLOW) | |
558 (void)close(p->fts_symfd); | |
559 if (sp->fts_child) { | |
560 fts_lfree(sp->fts_child); | |
561 sp->fts_child = NULL; | |
562 } | |
563 p->fts_info = FTS_DP; | |
564 LEAVE_DIR (sp, p, "1"); | |
565 return (p); | |
566 } | |
567 | |
568 /* Rebuild if only read the names and now traversing. */ | |
569 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
570 CLR(FTS_NAMEONLY); | |
571 fts_lfree(sp->fts_child); | |
572 sp->fts_child = NULL; | |
573 } | |
574 | |
575 /* | |
576 * Cd to the subdirectory. | |
577 * | |
578 * If have already read and now fail to chdir, whack the list | |
579 * to make the names come out right, and set the parent errno | |
580 * so the application will eventually get an error condition. | |
581 * Set the FTS_DONTCHDIR flag so that when we logically change | |
582 * directories back to the parent we don't do a chdir. | |
583 * | |
584 * If haven't read do so. If the read fails, fts_build sets | |
585 * FTS_STOP or the fts_info field of the node. | |
586 */ | |
587 if (sp->fts_child != NULL) { | |
588 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
589 p->fts_errno = errno; | |
590 p->fts_flags |= FTS_DONTCHDIR; | |
591 for (p = sp->fts_child; p != NULL; | |
592 p = p->fts_link) | |
593 p->fts_accpath = | |
594 p->fts_parent->fts_accpath; | |
595 } | |
596 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
597 if (ISSET(FTS_STOP)) | |
598 return (NULL); | |
599 /* If fts_build's call to fts_safe_changedir failed | |
600 because it was not able to fchdir into a | |
601 subdirectory, tell the caller. */ | |
602 if (p->fts_errno) | |
603 p->fts_info = FTS_ERR; | |
604 LEAVE_DIR (sp, p, "2"); | |
605 return (p); | |
606 } | |
607 p = sp->fts_child; | |
608 sp->fts_child = NULL; | |
609 goto name; | |
610 } | |
611 | |
612 /* Move to the next node on this level. */ | |
613 next: tmp = p; | |
614 if ((p = p->fts_link) != NULL) { | |
615 free(tmp); | |
616 | |
617 /* | |
618 * If reached the top, return to the original directory (or | |
5907 | 619 * the root of the tree), and load the file names for the next |
620 * root. | |
5858 | 621 */ |
622 if (p->fts_level == FTS_ROOTLEVEL) { | |
7151 | 623 if (RESTORE_INITIAL_CWD(sp)) { |
5858 | 624 SET(FTS_STOP); |
6540 | 625 sp->fts_cur = p; |
5858 | 626 return (NULL); |
627 } | |
628 fts_load(sp, p); | |
5872 | 629 goto check_for_dir; |
5858 | 630 } |
631 | |
632 /* | |
633 * User may have called fts_set on the node. If skipped, | |
634 * ignore. If followed, get a file descriptor so we can | |
635 * get back if necessary. | |
636 */ | |
637 if (p->fts_instr == FTS_SKIP) | |
638 goto next; | |
639 if (p->fts_instr == FTS_FOLLOW) { | |
640 p->fts_info = fts_stat(sp, p, true); | |
641 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
7151 | 642 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
5858 | 643 p->fts_errno = errno; |
644 p->fts_info = FTS_ERR; | |
645 } else | |
646 p->fts_flags |= FTS_SYMFOLLOW; | |
647 } | |
648 p->fts_instr = FTS_NOINSTR; | |
649 } | |
650 | |
651 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
652 *t++ = '/'; | |
653 memmove(t, p->fts_name, p->fts_namelen + 1); | |
5872 | 654 check_for_dir: |
655 sp->fts_cur = p; | |
5858 | 656 if (p->fts_info == FTS_D) |
5872 | 657 { |
658 Dprintf ((" %s-entering: %s\n", sp, p->fts_path)); | |
659 if (! enter_dir (sp, p)) | |
660 { | |
661 __set_errno (ENOMEM); | |
662 return NULL; | |
663 } | |
664 } | |
665 return p; | |
5858 | 666 } |
667 | |
668 /* Move up to the parent node. */ | |
669 p = tmp->fts_parent; | |
670 free(tmp); | |
671 | |
672 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
673 /* | |
674 * Done; free everything up and set errno to 0 so the user | |
675 * can distinguish between error and EOF. | |
676 */ | |
677 free(p); | |
678 __set_errno (0); | |
679 return (sp->fts_cur = NULL); | |
680 } | |
681 | |
5907 | 682 /* NUL terminate the file name. */ |
5858 | 683 sp->fts_path[p->fts_pathlen] = '\0'; |
684 | |
685 /* | |
7151 | 686 * Return to the parent directory. If at a root node, restore |
687 * the initial working directory. If we came through a symlink, | |
688 * go back through the file descriptor. Otherwise, move up | |
689 * one level, via "..". | |
5858 | 690 */ |
691 if (p->fts_level == FTS_ROOTLEVEL) { | |
7151 | 692 if (RESTORE_INITIAL_CWD(sp)) { |
5858 | 693 p->fts_errno = errno; |
694 SET(FTS_STOP); | |
695 } | |
696 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
697 if (FCHDIR(sp, p->fts_symfd)) { | |
7151 | 698 int saved_errno = errno; |
5858 | 699 (void)close(p->fts_symfd); |
700 __set_errno (saved_errno); | |
701 p->fts_errno = errno; | |
702 SET(FTS_STOP); | |
703 } | |
704 (void)close(p->fts_symfd); | |
705 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
706 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
707 p->fts_errno = errno; | |
708 SET(FTS_STOP); | |
709 } | |
710 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
711 if (p->fts_errno == 0) | |
712 LEAVE_DIR (sp, p, "3"); | |
713 sp->fts_cur = p; | |
714 return ISSET(FTS_STOP) ? NULL : p; | |
715 } | |
716 | |
717 /* | |
718 * Fts_set takes the stream as an argument although it's not used in this | |
719 * implementation; it would be necessary if anyone wanted to add global | |
720 * semantics to fts using fts_set. An error return is allowed for similar | |
721 * reasons. | |
722 */ | |
723 /* ARGSUSED */ | |
724 int | |
725 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
726 { | |
727 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
728 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
729 __set_errno (EINVAL); | |
730 return (1); | |
731 } | |
732 p->fts_instr = instr; | |
733 return (0); | |
734 } | |
735 | |
736 FTSENT * | |
737 fts_children (register FTS *sp, int instr) | |
738 { | |
739 register FTSENT *p; | |
740 int fd; | |
741 | |
742 if (instr != 0 && instr != FTS_NAMEONLY) { | |
743 __set_errno (EINVAL); | |
744 return (NULL); | |
745 } | |
746 | |
747 /* Set current node pointer. */ | |
748 p = sp->fts_cur; | |
749 | |
750 /* | |
751 * Errno set to 0 so user can distinguish empty directory from | |
752 * an error. | |
753 */ | |
754 __set_errno (0); | |
755 | |
756 /* Fatal errors stop here. */ | |
757 if (ISSET(FTS_STOP)) | |
758 return (NULL); | |
759 | |
760 /* Return logical hierarchy of user's arguments. */ | |
761 if (p->fts_info == FTS_INIT) | |
762 return (p->fts_link); | |
763 | |
764 /* | |
765 * If not a directory being visited in pre-order, stop here. Could | |
766 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
767 * same effect is available with FTS_AGAIN. | |
768 */ | |
769 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
770 return (NULL); | |
771 | |
772 /* Free up any previous child list. */ | |
773 if (sp->fts_child != NULL) | |
774 fts_lfree(sp->fts_child); | |
775 | |
776 if (instr == FTS_NAMEONLY) { | |
777 SET(FTS_NAMEONLY); | |
778 instr = BNAMES; | |
779 } else | |
780 instr = BCHILD; | |
781 | |
782 /* | |
5907 | 783 * If using chdir on a relative file name and called BEFORE fts_read |
784 * does its chdir to the root of a traversal, we can lose -- we need to | |
5858 | 785 * chdir into the subdirectory, and we don't know where the current |
786 * directory is, so we can't get back so that the upcoming chdir by | |
787 * fts_read will work. | |
788 */ | |
789 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
790 ISSET(FTS_NOCHDIR)) | |
791 return (sp->fts_child = fts_build(sp, instr)); | |
792 | |
7151 | 793 if ((fd = diropen (sp, ".")) < 0) |
5858 | 794 return (sp->fts_child = NULL); |
795 sp->fts_child = fts_build(sp, instr); | |
7151 | 796 if (ISSET(FTS_CWDFD)) |
797 { | |
798 cwd_advance_fd (sp, fd); | |
799 } | |
800 else | |
801 { | |
802 if (fchdir(fd)) | |
803 { | |
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
804 int saved_errno = errno; |
7151 | 805 close (fd); |
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
806 __set_errno (saved_errno); |
7151 | 807 return NULL; |
808 } | |
809 close (fd); | |
810 } | |
5858 | 811 return (sp->fts_child); |
812 } | |
813 | |
814 /* | |
815 * This is the tricky part -- do not casually change *anything* in here. The | |
816 * idea is to build the linked list of entries that are used by fts_children | |
817 * and fts_read. There are lots of special cases. | |
818 * | |
819 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
820 * set and it's a physical walk (so that symbolic links can't be directories), | |
821 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
822 * of the file is in the directory entry. Otherwise, we assume that the number | |
823 * of subdirectories in a node is equal to the number of links to the parent. | |
824 * The former skips all stat calls. The latter skips stat calls in any leaf | |
825 * directories and for any files after the subdirectories in the directory have | |
826 * been found, cutting the stat calls by about 2/3. | |
827 */ | |
828 static FTSENT * | |
829 internal_function | |
830 fts_build (register FTS *sp, int type) | |
831 { | |
832 register struct dirent *dp; | |
833 register FTSENT *p, *head; | |
834 register size_t nitems; | |
835 FTSENT *cur, *tail; | |
836 DIR *dirp; | |
837 void *oldaddr; | |
838 int saved_errno; | |
839 bool descend; | |
840 bool doadjust; | |
841 ptrdiff_t level; | |
842 nlink_t nlinks; | |
843 bool nostat; | |
844 size_t len, maxlen, new_len; | |
845 char *cp; | |
846 | |
847 /* Set current node pointer. */ | |
848 cur = sp->fts_cur; | |
849 | |
850 /* | |
851 * Open the directory for reading. If this fails, we're done. | |
852 * If being called from fts_read, set the fts_info field. | |
853 */ | |
854 #if defined FTS_WHITEOUT && 0 | |
855 if (ISSET(FTS_WHITEOUT)) | |
856 oflag = DTF_NODUP|DTF_REWIND; | |
857 else | |
858 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
859 #else | |
7151 | 860 # define __opendir2(file, flag) \ |
861 ( ! ISSET(FTS_NOCHDIR) && ISSET(FTS_CWDFD) \ | |
862 ? opendirat(sp->fts_cwd_fd, file) \ | |
863 : opendir(file)) | |
5858 | 864 #endif |
865 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
866 if (type == BREAD) { | |
867 cur->fts_info = FTS_DNR; | |
868 cur->fts_errno = errno; | |
869 } | |
870 return (NULL); | |
871 } | |
872 | |
873 /* | |
874 * Nlinks is the number of possible entries of type directory in the | |
875 * directory if we're cheating on stat calls, 0 if we're not doing | |
876 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
877 */ | |
878 if (type == BNAMES) { | |
879 nlinks = 0; | |
880 /* Be quiet about nostat, GCC. */ | |
881 nostat = false; | |
882 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
883 nlinks = (cur->fts_statp->st_nlink | |
884 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
885 nostat = true; | |
886 } else { | |
887 nlinks = -1; | |
888 nostat = false; | |
889 } | |
890 | |
891 /* | |
892 * If we're going to need to stat anything or we want to descend | |
893 * and stay in the directory, chdir. If this fails we keep going, | |
894 * but set a flag so we don't chdir after the post-order visit. | |
895 * We won't be able to stat anything, but we can still return the | |
896 * names themselves. Note, that since fts_read won't be able to | |
5907 | 897 * chdir into the directory, it will have to return different file |
5858 | 898 * names than before, i.e. "a/b" instead of "b". Since the node |
899 * has already been visited in pre-order, have to wait until the | |
900 * post-order visit to return the error. There is a special case | |
901 * here, if there was nothing to stat then it's not an error to | |
902 * not be able to stat. This is all fairly nasty. If a program | |
903 * needed sorted entries or stat information, they had better be | |
904 * checking FTS_NS on the returned nodes. | |
905 */ | |
906 if (nlinks || type == BREAD) { | |
7151 | 907 int dir_fd = dirfd(dirp); |
908 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) | |
909 dir_fd = dup (dir_fd); | |
910 if (dir_fd < 0 || fts_safe_changedir(sp, cur, dir_fd, NULL)) { | |
5858 | 911 if (nlinks && type == BREAD) |
912 cur->fts_errno = errno; | |
913 cur->fts_flags |= FTS_DONTCHDIR; | |
914 descend = false; | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
915 closedir(dirp); |
7151 | 916 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) |
917 close (dir_fd); | |
5858 | 918 dirp = NULL; |
919 } else | |
920 descend = true; | |
921 } else | |
922 descend = false; | |
923 | |
924 /* | |
925 * Figure out the max file name length that can be stored in the | |
5907 | 926 * current buffer -- the inner loop allocates more space as necessary. |
5858 | 927 * We really wouldn't have to do the maxlen calculations here, we |
5907 | 928 * could do them in fts_read before returning the name, but it's a |
5858 | 929 * lot easier here since the length is part of the dirent structure. |
930 * | |
931 * If not changing directories set a pointer so that can just append | |
5907 | 932 * each new component into the file name. |
5858 | 933 */ |
934 len = NAPPEND(cur); | |
935 if (ISSET(FTS_NOCHDIR)) { | |
936 cp = sp->fts_path + len; | |
937 *cp++ = '/'; | |
938 } else { | |
939 /* GCC, you're too verbose. */ | |
940 cp = NULL; | |
941 } | |
942 len++; | |
943 maxlen = sp->fts_pathlen - len; | |
944 | |
945 level = cur->fts_level + 1; | |
946 | |
947 /* Read the directory, attaching each entry to the `link' pointer. */ | |
948 doadjust = false; | |
949 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
950 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) | |
951 continue; | |
952 | |
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
953 if ((p = fts_alloc (sp, dp->d_name, |
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
954 _D_EXACT_NAMLEN (dp))) == NULL) |
5858 | 955 goto mem1; |
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
956 if (_D_EXACT_NAMLEN (dp) >= maxlen) { |
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
957 /* include space for NUL */ |
5858 | 958 oldaddr = sp->fts_path; |
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
959 if (! fts_palloc(sp, _D_EXACT_NAMLEN (dp) + len + 1)) { |
5858 | 960 /* |
5907 | 961 * No more memory. Save |
5858 | 962 * errno, free up the current structure and the |
963 * structures already allocated. | |
964 */ | |
965 mem1: saved_errno = errno; | |
966 if (p) | |
967 free(p); | |
968 fts_lfree(head); | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
969 closedir(dirp); |
5858 | 970 cur->fts_info = FTS_ERR; |
971 SET(FTS_STOP); | |
972 __set_errno (saved_errno); | |
973 return (NULL); | |
974 } | |
975 /* Did realloc() change the pointer? */ | |
976 if (oldaddr != sp->fts_path) { | |
977 doadjust = true; | |
978 if (ISSET(FTS_NOCHDIR)) | |
979 cp = sp->fts_path + len; | |
980 } | |
981 maxlen = sp->fts_pathlen - len; | |
982 } | |
983 | |
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
984 new_len = len + _D_EXACT_NAMLEN (dp); |
5858 | 985 if (new_len < len) { |
986 /* | |
987 * In the unlikely even that we would end up | |
5907 | 988 * with a file name longer than SIZE_MAX, free up |
5858 | 989 * the current structure and the structures already |
990 * allocated, then error out with ENAMETOOLONG. | |
991 */ | |
992 free(p); | |
993 fts_lfree(head); | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
994 closedir(dirp); |
5858 | 995 cur->fts_info = FTS_ERR; |
996 SET(FTS_STOP); | |
997 __set_errno (ENAMETOOLONG); | |
998 return (NULL); | |
999 } | |
1000 p->fts_level = level; | |
1001 p->fts_parent = sp->fts_cur; | |
1002 p->fts_pathlen = new_len; | |
1003 | |
1004 #if defined FTS_WHITEOUT && 0 | |
1005 if (dp->d_type == DT_WHT) | |
1006 p->fts_flags |= FTS_ISW; | |
1007 #endif | |
1008 | |
7151 | 1009 /* Build a file name for fts_stat to stat. */ |
1010 if (ISSET(FTS_NOCHDIR)) { | |
1011 p->fts_accpath = p->fts_path; | |
1012 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
1013 } else | |
1014 p->fts_accpath = p->fts_name; | |
1015 /* Stat it. */ | |
1016 p->fts_info = fts_stat(sp, p, false); | |
5858 | 1017 |
7151 | 1018 /* Decrement link count if applicable. */ |
1019 if (nlinks > 0 && (p->fts_info == FTS_D || | |
1020 p->fts_info == FTS_DC || p->fts_info == FTS_DOT)) | |
1021 nlinks -= nostat; | |
5858 | 1022 |
1023 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
1024 p->fts_link = NULL; | |
1025 if (head == NULL) | |
1026 head = tail = p; | |
1027 else { | |
1028 tail->fts_link = p; | |
1029 tail = p; | |
1030 } | |
1031 ++nitems; | |
1032 } | |
1033 if (dirp) | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1034 closedir(dirp); |
5858 | 1035 |
1036 /* | |
5907 | 1037 * If realloc() changed the address of the file name, adjust the |
5858 | 1038 * addresses for the rest of the tree and the dir list. |
1039 */ | |
1040 if (doadjust) | |
1041 fts_padjust(sp, head); | |
1042 | |
1043 /* | |
5907 | 1044 * If not changing directories, reset the file name back to original |
5858 | 1045 * state. |
1046 */ | |
1047 if (ISSET(FTS_NOCHDIR)) { | |
1048 if (len == sp->fts_pathlen || nitems == 0) | |
1049 --cp; | |
1050 *cp = '\0'; | |
1051 } | |
1052 | |
1053 /* | |
1054 * If descended after called from fts_children or after called from | |
1055 * fts_read and nothing found, get back. At the root level we use | |
5907 | 1056 * the saved fd; if one of fts_open()'s arguments is a relative name |
5858 | 1057 * to an empty directory, we wind up here with no other way back. If |
1058 * can't get back, we're done. | |
1059 */ | |
1060 if (descend && (type == BCHILD || !nitems) && | |
7151 | 1061 (cur->fts_level == FTS_ROOTLEVEL |
1062 ? RESTORE_INITIAL_CWD(sp) | |
1063 : fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
5858 | 1064 cur->fts_info = FTS_ERR; |
1065 SET(FTS_STOP); | |
7151 | 1066 fts_lfree(head); |
5858 | 1067 return (NULL); |
1068 } | |
1069 | |
1070 /* If didn't find anything, return NULL. */ | |
1071 if (!nitems) { | |
1072 if (type == BREAD) | |
1073 cur->fts_info = FTS_DP; | |
7151 | 1074 fts_lfree(head); |
5858 | 1075 return (NULL); |
1076 } | |
1077 | |
1078 /* Sort the entries. */ | |
1079 if (sp->fts_compar && nitems > 1) | |
1080 head = fts_sort(sp, head, nitems); | |
1081 return (head); | |
1082 } | |
1083 | |
1084 #if FTS_DEBUG | |
1085 | |
1086 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
1087 current hierarchy. There should be a directory with dev/inode | |
1088 matching those of AD. If not, print a lot of diagnostics. */ | |
1089 static void | |
1090 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
1091 { | |
1092 FTSENT const *ent; | |
1093 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
1094 { | |
1095 if (ad->ino == ent->fts_statp->st_ino | |
1096 && ad->dev == ent->fts_statp->st_dev) | |
1097 return; | |
1098 } | |
1099 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
1100 printf ("active dirs:\n"); | |
1101 for (ent = e_curr; | |
1102 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
1103 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
1104 ad->fts_ent->fts_accpath, | |
1105 (uintmax_t) ad->dev, | |
1106 (uintmax_t) ad->ino, | |
1107 ent->fts_accpath, | |
1108 (uintmax_t) ent->fts_statp->st_dev, | |
1109 (uintmax_t) ent->fts_statp->st_ino); | |
1110 } | |
1111 | |
1112 void | |
1113 fts_cross_check (FTS const *sp) | |
1114 { | |
1115 FTSENT const *ent = sp->fts_cur; | |
1116 FTSENT const *t; | |
1117 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
1118 return; | |
1119 | |
1120 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
1121 /* Make sure every parent dir is in the tree. */ | |
1122 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
1123 { | |
1124 struct Active_dir ad; | |
1125 ad.ino = t->fts_statp->st_ino; | |
1126 ad.dev = t->fts_statp->st_dev; | |
6034
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1127 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
5858 | 1128 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
1129 } | |
1130 | |
1131 /* Make sure every dir in the tree is an active dir. | |
1132 But ENT is not necessarily a directory. If so, just skip this part. */ | |
1133 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
1134 && (ent->fts_info == FTS_DP | |
1135 || ent->fts_info == FTS_D)) | |
1136 { | |
1137 struct Active_dir *ad; | |
6034
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1138 for (ad = hash_get_first (sp->fts_cycle.ht); ad != NULL; |
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1139 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
5858 | 1140 { |
1141 find_matching_ancestor (ent, ad); | |
1142 } | |
1143 } | |
1144 } | |
1145 #endif | |
1146 | |
1147 static unsigned short int | |
1148 internal_function | |
1149 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
1150 { | |
1151 struct stat *sbp = p->fts_statp; | |
1152 int saved_errno; | |
1153 | |
1154 #if defined FTS_WHITEOUT && 0 | |
1155 /* check for whiteout */ | |
1156 if (p->fts_flags & FTS_ISW) { | |
1157 memset(sbp, '\0', sizeof (*sbp)); | |
1158 sbp->st_mode = S_IFWHT; | |
1159 return (FTS_W); | |
1160 } | |
1161 #endif | |
1162 | |
1163 /* | |
1164 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
1165 * a stat(2). If that fails, check for a non-existent symlink. If | |
1166 * fail, set the errno from the stat call. | |
1167 */ | |
1168 if (ISSET(FTS_LOGICAL) || follow) { | |
1169 if (stat(p->fts_accpath, sbp)) { | |
1170 saved_errno = errno; | |
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1171 if (errno == ENOENT |
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1172 && lstat(p->fts_accpath, sbp) == 0) { |
5858 | 1173 __set_errno (0); |
1174 return (FTS_SLNONE); | |
1175 } | |
1176 p->fts_errno = saved_errno; | |
1177 goto err; | |
1178 } | |
7151 | 1179 } else if (fstatat(sp->fts_cwd_fd, p->fts_accpath, sbp, |
1180 AT_SYMLINK_NOFOLLOW)) { | |
5858 | 1181 p->fts_errno = errno; |
1182 err: memset(sbp, 0, sizeof(struct stat)); | |
1183 return (FTS_NS); | |
1184 } | |
1185 | |
1186 if (S_ISDIR(sbp->st_mode)) { | |
1187 if (ISDOT(p->fts_name)) | |
1188 return (FTS_DOT); | |
5872 | 1189 |
1190 #if _LGPL_PACKAGE | |
1191 { | |
1192 /* | |
1193 * Cycle detection is done by brute force when the directory | |
1194 * is first encountered. If the tree gets deep enough or the | |
1195 * number of symbolic links to directories is high enough, | |
1196 * something faster might be worthwhile. | |
1197 */ | |
1198 FTSENT *t; | |
1199 | |
1200 for (t = p->fts_parent; | |
1201 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
1202 if (sbp->st_ino == t->fts_statp->st_ino | |
1203 && sbp->st_dev == t->fts_statp->st_dev) | |
1204 { | |
1205 p->fts_cycle = t; | |
1206 return (FTS_DC); | |
1207 } | |
1208 } | |
1209 #endif | |
1210 | |
5858 | 1211 return (FTS_D); |
1212 } | |
1213 if (S_ISLNK(sbp->st_mode)) | |
1214 return (FTS_SL); | |
1215 if (S_ISREG(sbp->st_mode)) | |
1216 return (FTS_F); | |
1217 return (FTS_DEFAULT); | |
1218 } | |
1219 | |
1220 static int | |
1221 fts_compar (void const *a, void const *b) | |
1222 { | |
1223 /* Convert A and B to the correct types, to pacify the compiler, and | |
1224 for portability to bizarre hosts where "void const *" and "FTSENT | |
1225 const **" differ in runtime representation. The comparison | |
1226 function cannot modify *a and *b, but there is no compile-time | |
1227 check for this. */ | |
1228 FTSENT const **pa = (FTSENT const **) a; | |
1229 FTSENT const **pb = (FTSENT const **) b; | |
1230 return pa[0]->fts_fts->fts_compar (pa, pb); | |
1231 } | |
1232 | |
1233 static FTSENT * | |
1234 internal_function | |
1235 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
1236 { | |
1237 register FTSENT **ap, *p; | |
1238 | |
1239 /* On most modern hosts, void * and FTSENT ** have the same | |
1240 run-time representation, and one can convert sp->fts_compar to | |
1241 the type qsort expects without problem. Use the heuristic that | |
1242 this is OK if the two pointer types are the same size, and if | |
1243 converting FTSENT ** to long int is the same as converting | |
1244 FTSENT ** to void * and then to long int. This heuristic isn't | |
1245 valid in general but we don't know of any counterexamples. */ | |
1246 FTSENT *dummy; | |
1247 int (*compare) (void const *, void const *) = | |
1248 ((sizeof &dummy == sizeof (void *) | |
1249 && (long int) &dummy == (long int) (void *) &dummy) | |
1250 ? (int (*) (void const *, void const *)) sp->fts_compar | |
1251 : fts_compar); | |
1252 | |
1253 /* | |
1254 * Construct an array of pointers to the structures and call qsort(3). | |
1255 * Reassemble the array in the order returned by qsort. If unable to | |
1256 * sort for memory reasons, return the directory entries in their | |
1257 * current order. Allocate enough space for the current needs plus | |
1258 * 40 so don't realloc one entry at a time. | |
1259 */ | |
1260 if (nitems > sp->fts_nitems) { | |
1261 struct _ftsent **a; | |
1262 | |
1263 sp->fts_nitems = nitems + 40; | |
1264 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
1265 || ! (a = realloc (sp->fts_array, | |
1266 sp->fts_nitems * sizeof *a))) { | |
1267 free(sp->fts_array); | |
1268 sp->fts_array = NULL; | |
1269 sp->fts_nitems = 0; | |
1270 return (head); | |
1271 } | |
1272 sp->fts_array = a; | |
1273 } | |
1274 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
1275 *ap++ = p; | |
1276 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
1277 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
1278 ap[0]->fts_link = ap[1]; | |
1279 ap[0]->fts_link = NULL; | |
1280 return (head); | |
1281 } | |
1282 | |
1283 static FTSENT * | |
1284 internal_function | |
1285 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
1286 { | |
1287 register FTSENT *p; | |
1288 size_t len; | |
1289 | |
1290 /* | |
1291 * The file name is a variable length array. Allocate the FTSENT | |
1292 * structure and the file name in one chunk. | |
1293 */ | |
1294 len = sizeof(FTSENT) + namelen; | |
1295 if ((p = malloc(len)) == NULL) | |
1296 return (NULL); | |
1297 | |
1298 /* Copy the name and guarantee NUL termination. */ | |
1299 memmove(p->fts_name, name, namelen); | |
1300 p->fts_name[namelen] = '\0'; | |
1301 | |
1302 p->fts_namelen = namelen; | |
1303 p->fts_fts = sp; | |
1304 p->fts_path = sp->fts_path; | |
1305 p->fts_errno = 0; | |
1306 p->fts_flags = 0; | |
1307 p->fts_instr = FTS_NOINSTR; | |
1308 p->fts_number = 0; | |
1309 p->fts_pointer = NULL; | |
1310 return (p); | |
1311 } | |
1312 | |
1313 static void | |
1314 internal_function | |
1315 fts_lfree (register FTSENT *head) | |
1316 { | |
1317 register FTSENT *p; | |
1318 | |
1319 /* Free a linked list of structures. */ | |
1320 while ((p = head)) { | |
1321 head = head->fts_link; | |
1322 free(p); | |
1323 } | |
1324 } | |
1325 | |
1326 /* | |
5907 | 1327 * Allow essentially unlimited file name lengths; find, rm, ls should |
1328 * all work on any tree. Most systems will allow creation of file | |
1329 * names much longer than MAXPATHLEN, even though the kernel won't | |
1330 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
1331 * so don't realloc the file name 2 bytes at a time. | |
5858 | 1332 */ |
1333 static bool | |
1334 internal_function | |
1335 fts_palloc (FTS *sp, size_t more) | |
1336 { | |
1337 char *p; | |
1338 size_t new_len = sp->fts_pathlen + more + 256; | |
1339 | |
1340 /* | |
1341 * See if fts_pathlen would overflow. | |
1342 */ | |
1343 if (new_len < sp->fts_pathlen) { | |
1344 if (sp->fts_path) { | |
1345 free(sp->fts_path); | |
1346 sp->fts_path = NULL; | |
1347 } | |
1348 sp->fts_path = NULL; | |
1349 __set_errno (ENAMETOOLONG); | |
1350 return false; | |
1351 } | |
1352 sp->fts_pathlen = new_len; | |
1353 p = realloc(sp->fts_path, sp->fts_pathlen); | |
1354 if (p == NULL) { | |
1355 free(sp->fts_path); | |
1356 sp->fts_path = NULL; | |
1357 return false; | |
1358 } | |
1359 sp->fts_path = p; | |
1360 return true; | |
1361 } | |
1362 | |
1363 /* | |
5907 | 1364 * When the file name is realloc'd, have to fix all of the pointers in |
1365 * structures already returned. | |
5858 | 1366 */ |
1367 static void | |
1368 internal_function | |
1369 fts_padjust (FTS *sp, FTSENT *head) | |
1370 { | |
1371 FTSENT *p; | |
1372 char *addr = sp->fts_path; | |
1373 | |
1374 #define ADJUST(p) do { \ | |
1375 if ((p)->fts_accpath != (p)->fts_name) { \ | |
1376 (p)->fts_accpath = \ | |
1377 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
1378 } \ | |
1379 (p)->fts_path = addr; \ | |
1380 } while (0) | |
1381 /* Adjust the current set of children. */ | |
1382 for (p = sp->fts_child; p; p = p->fts_link) | |
1383 ADJUST(p); | |
1384 | |
1385 /* Adjust the rest of the tree, including the current level. */ | |
1386 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
1387 ADJUST(p); | |
1388 p = p->fts_link ? p->fts_link : p->fts_parent; | |
1389 } | |
1390 } | |
1391 | |
1392 static size_t | |
1393 internal_function | |
1394 fts_maxarglen (char * const *argv) | |
1395 { | |
1396 size_t len, max; | |
1397 | |
1398 for (max = 0; *argv; ++argv) | |
1399 if ((len = strlen(*argv)) > max) | |
1400 max = len; | |
1401 return (max + 1); | |
1402 } | |
1403 | |
1404 /* | |
5907 | 1405 * Change to dir specified by fd or file name without getting |
5858 | 1406 * tricked by someone changing the world out from underneath us. |
1407 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
7151 | 1408 * If FD is non-negative, expect it to be used after this function returns, |
1409 * and to be closed eventually. So don't pass e.g., `dirfd(dirp)' and then | |
1410 * do closedir(dirp), because that would invalidate the saved FD. | |
1411 * Upon failure, close FD immediately and return nonzero. | |
5858 | 1412 */ |
1413 static int | |
1414 internal_function | |
5907 | 1415 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
5858 | 1416 { |
7151 | 1417 int ret; |
1418 | |
1419 int newfd = fd; | |
1420 if (ISSET(FTS_NOCHDIR)) { | |
1421 if (ISSET(FTS_CWDFD) && 0 <= fd) | |
1422 close (fd); | |
1423 return (0); | |
1424 } | |
1425 if (fd < 0 && (newfd = diropen (sp, dir)) < 0) | |
1426 return (-1); | |
5858 | 1427 |
7151 | 1428 /* The following dev/inode check is necessary if we're doing |
1429 a `logical' traversal (through symlinks, a la chown -L), | |
1430 if the system lacks O_NOFOLLOW support, or if we're changing | |
1431 to "..". In the latter case, O_NOFOLLOW can't help. In | |
1432 general (when the target is not ".."), diropen's use of | |
1433 O_NOFOLLOW ensures we don't mistakenly follow a symlink, | |
1434 so we can avoid the expense of this fstat. */ | |
1435 if (ISSET(FTS_LOGICAL) || O_NOFOLLOW == 0 | |
1436 || (dir && STREQ (dir, ".."))) | |
1437 { | |
1438 struct stat sb; | |
1439 if (fstat(newfd, &sb)) | |
1440 { | |
5858 | 1441 ret = -1; |
1442 goto bail; | |
7151 | 1443 } |
1444 if (p->fts_statp->st_dev != sb.st_dev | |
1445 || p->fts_statp->st_ino != sb.st_ino) | |
1446 { | |
5858 | 1447 __set_errno (ENOENT); /* disinformation */ |
1448 ret = -1; | |
1449 goto bail; | |
7151 | 1450 } |
1451 } | |
1452 | |
1453 if (ISSET(FTS_CWDFD)) | |
1454 { | |
1455 cwd_advance_fd (sp, newfd); | |
1456 return 0; | |
1457 } | |
1458 | |
5858 | 1459 ret = fchdir(newfd); |
1460 bail: | |
1461 if (fd < 0) | |
7151 | 1462 { |
1463 int oerrno = errno; | |
1464 (void)close(newfd); | |
1465 __set_errno (oerrno); | |
1466 } | |
5858 | 1467 return (ret); |
1468 } |