Mercurial > gnulib
annotate lib/fts.c @ 6934:d68ff786c180
* lib/getloadavg.c: Use __VMS, not VMS.
* lib/getopt.c: Likewise.
* lib/getpagesize.h: Likewise.
* lib/glob.c: Remove most VMS cruft; it hasn't been tested for a while and
probably does not work.
* lib/backupfile.c [HAVE_DIRENT_H && ! HAVE_NDIR_H]:
Don't worry about this obsolete case any more.
(HAVE_DIR): Remove. All uses removed; we now assume you can read
directories.
* lib/dirfd.h [HAVE_DIRENT_H && ! HAVE_NDIR_H]: Don't
worry about this obsolete case any more.
* lib/fts.c: Likewise.
* lib/getcwd.c: Likewise.
* lib/glob.h: Likewise.
* lib/savedir.c: Likewise.
* m4/backupfile.m4 (gl_BACKUPFILE): Check for dirent.h, instead
of invoking obsolescent AC_HEADER_DIRENT macro.
* m4/d-ino.m4 (gl_CHECK_TYPE_STRUCT_DIRENT_D_INO): Likewise.
* m4/d-type.m4 (gl_CHECK_TYPE_STRUCT_DIRENT_D_TYPE): Likewise.
* m4/dirfd.m4 (gl_FUNC_DIRFD): Likewise.
* m4/fts.m4 (gl_FUNC_FTS_CORE): Likewise.
* m4/getcwd.m4 (gl_PREREQ_GETCWD): Likewise.
* m4/glob.m4 (gl_PREREQ_GLOB): Likewise.
* m4/savedir.m4 (gl_SAVEDIR): Likewise.
* m4/readdir.m4: Remove; no longer needed.
author | Paul Eggert <eggert@cs.ucla.edu> |
---|---|
date | Thu, 06 Jul 2006 23:29:27 +0000 |
parents | 6f335711be5e |
children | 96af1224c6fa |
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 | |
5867
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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" | |
5867
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* fts.c: Include fts_.h first, to check interface.
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69 #include <stdbool.h> |
5858 | 70 #include <stdlib.h> |
71 #include <string.h> | |
72 #include <unistd.h> | |
73 | |
6034
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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74 #if ! _LIBC |
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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75 # include "lstat.h" |
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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76 #endif |
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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77 |
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* lib/getloadavg.c: Use __VMS, not VMS.
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78 #if HAVE_DIRENT_H || _LIBC |
5858 | 79 # include <dirent.h> |
6934
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* lib/getloadavg.c: Use __VMS, not VMS.
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80 # ifdef _D_EXACT_NAMLEN |
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* lib/getloadavg.c: Use __VMS, not VMS.
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81 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent) |
5858 | 82 # else |
6934
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83 # define NAMLEN(dirent) strlen ((dirent)->d_name) |
5858 | 84 # endif |
6934
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85 #else |
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86 # define dirent direct |
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87 # define NAMLEN(dirent) (dirent)->d_namlen |
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88 # include <ndir.h> |
5858 | 89 #endif |
90 | |
91 #ifdef _LIBC | |
92 # undef close | |
93 # define close __close | |
94 # undef closedir | |
95 # define closedir __closedir | |
96 # undef fchdir | |
97 # define fchdir __fchdir | |
98 # undef open | |
99 # define open __open | |
100 # undef opendir | |
101 # define opendir __opendir | |
102 # undef readdir | |
103 # define readdir __readdir | |
104 #else | |
105 # undef internal_function | |
106 # define internal_function /* empty */ | |
107 #endif | |
108 | |
109 #ifndef __set_errno | |
110 # define __set_errno(Val) errno = (Val) | |
111 #endif | |
112 | |
113 #ifndef __attribute__ | |
114 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ | |
115 # define __attribute__(x) /* empty */ | |
116 # endif | |
117 #endif | |
118 | |
119 #ifndef ATTRIBUTE_UNUSED | |
120 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
121 #endif | |
122 | |
123 | |
124 static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; | |
125 static FTSENT *fts_build (FTS *, int) internal_function; | |
126 static void fts_lfree (FTSENT *) internal_function; | |
127 static void fts_load (FTS *, FTSENT *) internal_function; | |
128 static size_t fts_maxarglen (char * const *) internal_function; | |
129 static void fts_padjust (FTS *, FTSENT *) internal_function; | |
130 static bool fts_palloc (FTS *, size_t) internal_function; | |
131 static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; | |
132 static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; | |
133 static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) | |
134 internal_function; | |
135 | |
5872 | 136 #if _LGPL_PACKAGE |
137 static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } | |
138 static void leave_dir (FTS *fts, FTSENT *ent) {} | |
139 static bool setup_dir (FTS *fts) { return true; } | |
140 static void free_dir (FTS *fts) {} | |
141 #else | |
6034
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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142 # include "fcntl--.h" |
5872 | 143 # include "fts-cycle.c" |
144 #endif | |
145 | |
5858 | 146 #ifndef MAX |
147 # define MAX(a,b) ((a) > (b) ? (a) : (b)) | |
148 #endif | |
149 | |
150 #ifndef SIZE_MAX | |
151 # define SIZE_MAX ((size_t) -1) | |
152 #endif | |
153 | |
154 #ifndef O_DIRECTORY | |
155 # define O_DIRECTORY 0 | |
156 #endif | |
157 | |
158 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2]))) | |
159 | |
160 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
161 #define ISSET(opt) (sp->fts_options & (opt)) | |
162 #define SET(opt) (sp->fts_options |= (opt)) | |
163 | |
164 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd)) | |
165 | |
166 /* fts_build flags */ | |
167 #define BCHILD 1 /* fts_children */ | |
168 #define BNAMES 2 /* fts_children, names only */ | |
169 #define BREAD 3 /* fts_read */ | |
170 | |
171 #if FTS_DEBUG | |
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* modules/fts (Files): Remove m4/inttypes-pri.m4.
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172 # include <inttypes.h> |
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173 # include <stdint.h> |
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174 # include <stdio.h> |
5858 | 175 bool fts_debug = false; |
176 # define Dprintf(x) do { if (fts_debug) printf x; } while (0) | |
177 #else | |
178 # define Dprintf(x) | |
179 #endif | |
180 | |
181 #define LEAVE_DIR(Fts, Ent, Tag) \ | |
5872 | 182 do \ |
183 { \ | |
5858 | 184 Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ |
5872 | 185 leave_dir (Fts, Ent); \ |
186 } \ | |
187 while (false) | |
5858 | 188 |
189 /* Open the directory DIR if possible, and return a file | |
190 descriptor. Return -1 and set errno on failure. It doesn't matter | |
191 whether the file descriptor has read or write access. */ | |
192 | |
193 static int | |
194 internal_function | |
195 diropen (char const *dir) | |
196 { | |
6618
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* fts.c (diropen): Open with O_NOCTTY | O_NONBLOCK too. Don't
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197 return open (dir, O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK); |
5858 | 198 } |
199 | |
200 FTS * | |
201 fts_open (char * const *argv, | |
202 register int options, | |
203 int (*compar) (FTSENT const **, FTSENT const **)) | |
204 { | |
205 register FTS *sp; | |
206 register FTSENT *p, *root; | |
207 register size_t nitems; | |
208 FTSENT *parent, *tmp = NULL; /* pacify gcc */ | |
209 size_t len; | |
210 | |
211 /* Options check. */ | |
212 if (options & ~FTS_OPTIONMASK) { | |
213 __set_errno (EINVAL); | |
214 return (NULL); | |
215 } | |
216 | |
217 /* Allocate/initialize the stream */ | |
218 if ((sp = malloc(sizeof(FTS))) == NULL) | |
219 return (NULL); | |
220 memset(sp, 0, sizeof(FTS)); | |
221 sp->fts_compar = compar; | |
222 sp->fts_options = options; | |
223 | |
224 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
225 if (ISSET(FTS_LOGICAL)) | |
226 SET(FTS_NOCHDIR); | |
227 | |
228 /* | |
5907 | 229 * Start out with 1K of file name space, and enough, in any case, |
230 * to hold the user's file names. | |
5858 | 231 */ |
232 #ifndef MAXPATHLEN | |
233 # define MAXPATHLEN 1024 | |
234 #endif | |
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235 { |
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236 size_t maxarglen = fts_maxarglen(argv); |
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237 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
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238 goto mem1; |
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239 } |
5858 | 240 |
241 /* Allocate/initialize root's parent. */ | |
242 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
243 goto mem2; | |
244 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
245 | |
246 /* Allocate/initialize root(s). */ | |
247 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
5907 | 248 /* Don't allow zero-length file names. */ |
5858 | 249 if ((len = strlen(*argv)) == 0) { |
250 __set_errno (ENOENT); | |
251 goto mem3; | |
252 } | |
253 | |
254 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
255 goto mem3; | |
256 p->fts_level = FTS_ROOTLEVEL; | |
257 p->fts_parent = parent; | |
258 p->fts_accpath = p->fts_name; | |
259 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW) != 0); | |
260 | |
261 /* Command-line "." and ".." are real directories. */ | |
262 if (p->fts_info == FTS_DOT) | |
263 p->fts_info = FTS_D; | |
264 | |
265 /* | |
266 * If comparison routine supplied, traverse in sorted | |
267 * order; otherwise traverse in the order specified. | |
268 */ | |
269 if (compar) { | |
270 p->fts_link = root; | |
271 root = p; | |
272 } else { | |
273 p->fts_link = NULL; | |
274 if (root == NULL) | |
275 tmp = root = p; | |
276 else { | |
277 tmp->fts_link = p; | |
278 tmp = p; | |
279 } | |
280 } | |
281 } | |
282 if (compar && nitems > 1) | |
283 root = fts_sort(sp, root, nitems); | |
284 | |
285 /* | |
286 * Allocate a dummy pointer and make fts_read think that we've just | |
287 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
288 * so that everything about the "current" node is ignored. | |
289 */ | |
290 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
291 goto mem3; | |
292 sp->fts_cur->fts_link = root; | |
293 sp->fts_cur->fts_info = FTS_INIT; | |
5872 | 294 if (! setup_dir (sp)) |
295 goto mem3; | |
5858 | 296 |
297 /* | |
298 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
5907 | 299 * that we can get back here; this could be avoided for some file names, |
5858 | 300 * but almost certainly not worth the effort. Slashes, symbolic links, |
301 * and ".." are all fairly nasty problems. Note, if we can't get the | |
302 * descriptor we run anyway, just more slowly. | |
303 */ | |
304 if (!ISSET(FTS_NOCHDIR) | |
305 && (sp->fts_rfd = diropen (".")) < 0) | |
306 SET(FTS_NOCHDIR); | |
307 | |
308 return (sp); | |
309 | |
310 mem3: fts_lfree(root); | |
311 free(parent); | |
312 mem2: free(sp->fts_path); | |
313 mem1: free(sp); | |
314 return (NULL); | |
315 } | |
316 | |
317 static void | |
318 internal_function | |
319 fts_load (FTS *sp, register FTSENT *p) | |
320 { | |
321 register size_t len; | |
322 register char *cp; | |
323 | |
324 /* | |
325 * Load the stream structure for the next traversal. Since we don't | |
326 * actually enter the directory until after the preorder visit, set | |
327 * the fts_accpath field specially so the chdir gets done to the right | |
328 * place and the user can access the first node. From fts_open it's | |
5907 | 329 * known that the file name will fit. |
5858 | 330 */ |
331 len = p->fts_pathlen = p->fts_namelen; | |
332 memmove(sp->fts_path, p->fts_name, len + 1); | |
333 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
334 len = strlen(++cp); | |
335 memmove(p->fts_name, cp, len + 1); | |
336 p->fts_namelen = len; | |
337 } | |
338 p->fts_accpath = p->fts_path = sp->fts_path; | |
339 sp->fts_dev = p->fts_statp->st_dev; | |
340 } | |
341 | |
342 int | |
343 fts_close (FTS *sp) | |
344 { | |
345 register FTSENT *freep, *p; | |
346 int saved_errno = 0; | |
347 | |
348 /* | |
349 * This still works if we haven't read anything -- the dummy structure | |
350 * points to the root list, so we step through to the end of the root | |
351 * list which has a valid parent pointer. | |
352 */ | |
353 if (sp->fts_cur) { | |
354 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
355 freep = p; | |
356 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
357 free(freep); | |
358 } | |
359 free(p); | |
360 } | |
361 | |
5907 | 362 /* Free up child linked list, sort array, file name buffer. */ |
5858 | 363 if (sp->fts_child) |
364 fts_lfree(sp->fts_child); | |
365 if (sp->fts_array) | |
366 free(sp->fts_array); | |
367 free(sp->fts_path); | |
368 | |
369 /* Return to original directory, save errno if necessary. */ | |
370 if (!ISSET(FTS_NOCHDIR)) { | |
371 if (fchdir(sp->fts_rfd)) | |
372 saved_errno = errno; | |
373 (void)close(sp->fts_rfd); | |
374 } | |
375 | |
5872 | 376 free_dir (sp); |
5858 | 377 |
378 /* Free up the stream pointer. */ | |
379 free(sp); | |
380 | |
381 /* Set errno and return. */ | |
382 if (saved_errno) { | |
383 __set_errno (saved_errno); | |
384 return (-1); | |
385 } | |
386 | |
387 return (0); | |
388 } | |
389 | |
390 /* | |
5907 | 391 * Special case of "/" at the end of the file name so that slashes aren't |
392 * appended which would cause file names to be written as "....//foo". | |
5858 | 393 */ |
394 #define NAPPEND(p) \ | |
395 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
396 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
397 | |
398 FTSENT * | |
399 fts_read (register FTS *sp) | |
400 { | |
401 register FTSENT *p, *tmp; | |
402 register unsigned short int instr; | |
403 register char *t; | |
404 int saved_errno; | |
405 | |
406 /* If finished or unrecoverable error, return NULL. */ | |
407 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
408 return (NULL); | |
409 | |
410 /* Set current node pointer. */ | |
411 p = sp->fts_cur; | |
412 | |
413 /* Save and zero out user instructions. */ | |
414 instr = p->fts_instr; | |
415 p->fts_instr = FTS_NOINSTR; | |
416 | |
417 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
418 if (instr == FTS_AGAIN) { | |
419 p->fts_info = fts_stat(sp, p, false); | |
420 return (p); | |
421 } | |
422 Dprintf (("fts_read: p=%s\n", | |
423 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
424 | |
425 /* | |
426 * Following a symlink -- SLNONE test allows application to see | |
427 * SLNONE and recover. If indirecting through a symlink, have | |
428 * keep a pointer to current location. If unable to get that | |
429 * pointer, follow fails. | |
430 */ | |
431 if (instr == FTS_FOLLOW && | |
432 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
433 p->fts_info = fts_stat(sp, p, true); | |
434 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
435 if ((p->fts_symfd = diropen (".")) < 0) { | |
436 p->fts_errno = errno; | |
437 p->fts_info = FTS_ERR; | |
438 } else | |
439 p->fts_flags |= FTS_SYMFOLLOW; | |
440 } | |
5872 | 441 goto check_for_dir; |
5858 | 442 } |
443 | |
444 /* Directory in pre-order. */ | |
445 if (p->fts_info == FTS_D) { | |
446 /* If skipped or crossed mount point, do post-order visit. */ | |
447 if (instr == FTS_SKIP || | |
448 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
449 if (p->fts_flags & FTS_SYMFOLLOW) | |
450 (void)close(p->fts_symfd); | |
451 if (sp->fts_child) { | |
452 fts_lfree(sp->fts_child); | |
453 sp->fts_child = NULL; | |
454 } | |
455 p->fts_info = FTS_DP; | |
456 LEAVE_DIR (sp, p, "1"); | |
457 return (p); | |
458 } | |
459 | |
460 /* Rebuild if only read the names and now traversing. */ | |
461 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
462 CLR(FTS_NAMEONLY); | |
463 fts_lfree(sp->fts_child); | |
464 sp->fts_child = NULL; | |
465 } | |
466 | |
467 /* | |
468 * Cd to the subdirectory. | |
469 * | |
470 * If have already read and now fail to chdir, whack the list | |
471 * to make the names come out right, and set the parent errno | |
472 * so the application will eventually get an error condition. | |
473 * Set the FTS_DONTCHDIR flag so that when we logically change | |
474 * directories back to the parent we don't do a chdir. | |
475 * | |
476 * If haven't read do so. If the read fails, fts_build sets | |
477 * FTS_STOP or the fts_info field of the node. | |
478 */ | |
479 if (sp->fts_child != NULL) { | |
480 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
481 p->fts_errno = errno; | |
482 p->fts_flags |= FTS_DONTCHDIR; | |
483 for (p = sp->fts_child; p != NULL; | |
484 p = p->fts_link) | |
485 p->fts_accpath = | |
486 p->fts_parent->fts_accpath; | |
487 } | |
488 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
489 if (ISSET(FTS_STOP)) | |
490 return (NULL); | |
491 /* If fts_build's call to fts_safe_changedir failed | |
492 because it was not able to fchdir into a | |
493 subdirectory, tell the caller. */ | |
494 if (p->fts_errno) | |
495 p->fts_info = FTS_ERR; | |
496 /* FIXME: see if this should be in an else block */ | |
497 LEAVE_DIR (sp, p, "2"); | |
498 return (p); | |
499 } | |
500 p = sp->fts_child; | |
501 sp->fts_child = NULL; | |
502 goto name; | |
503 } | |
504 | |
505 /* Move to the next node on this level. */ | |
506 next: tmp = p; | |
507 if ((p = p->fts_link) != NULL) { | |
508 free(tmp); | |
509 | |
510 /* | |
511 * If reached the top, return to the original directory (or | |
5907 | 512 * the root of the tree), and load the file names for the next |
513 * root. | |
5858 | 514 */ |
515 if (p->fts_level == FTS_ROOTLEVEL) { | |
516 if (FCHDIR(sp, sp->fts_rfd)) { | |
517 SET(FTS_STOP); | |
6540 | 518 sp->fts_cur = p; |
5858 | 519 return (NULL); |
520 } | |
521 fts_load(sp, p); | |
5872 | 522 goto check_for_dir; |
5858 | 523 } |
524 | |
525 /* | |
526 * User may have called fts_set on the node. If skipped, | |
527 * ignore. If followed, get a file descriptor so we can | |
528 * get back if necessary. | |
529 */ | |
530 if (p->fts_instr == FTS_SKIP) | |
531 goto next; | |
532 if (p->fts_instr == FTS_FOLLOW) { | |
533 p->fts_info = fts_stat(sp, p, true); | |
534 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
535 if ((p->fts_symfd = diropen (".")) < 0) { | |
536 p->fts_errno = errno; | |
537 p->fts_info = FTS_ERR; | |
538 } else | |
539 p->fts_flags |= FTS_SYMFOLLOW; | |
540 } | |
541 p->fts_instr = FTS_NOINSTR; | |
542 } | |
543 | |
544 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
545 *t++ = '/'; | |
546 memmove(t, p->fts_name, p->fts_namelen + 1); | |
5872 | 547 check_for_dir: |
548 sp->fts_cur = p; | |
5858 | 549 if (p->fts_info == FTS_D) |
5872 | 550 { |
551 Dprintf ((" %s-entering: %s\n", sp, p->fts_path)); | |
552 if (! enter_dir (sp, p)) | |
553 { | |
554 __set_errno (ENOMEM); | |
555 return NULL; | |
556 } | |
557 } | |
558 return p; | |
5858 | 559 } |
560 | |
561 /* Move up to the parent node. */ | |
562 p = tmp->fts_parent; | |
563 free(tmp); | |
564 | |
565 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
566 /* | |
567 * Done; free everything up and set errno to 0 so the user | |
568 * can distinguish between error and EOF. | |
569 */ | |
570 free(p); | |
571 __set_errno (0); | |
572 return (sp->fts_cur = NULL); | |
573 } | |
574 | |
5907 | 575 /* NUL terminate the file name. */ |
5858 | 576 sp->fts_path[p->fts_pathlen] = '\0'; |
577 | |
578 /* | |
579 * Return to the parent directory. If at a root node or came through | |
580 * a symlink, go back through the file descriptor. Otherwise, cd up | |
581 * one directory. | |
582 */ | |
583 if (p->fts_level == FTS_ROOTLEVEL) { | |
584 if (FCHDIR(sp, sp->fts_rfd)) { | |
585 p->fts_errno = errno; | |
586 SET(FTS_STOP); | |
587 } | |
588 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
589 if (FCHDIR(sp, p->fts_symfd)) { | |
590 saved_errno = errno; | |
591 (void)close(p->fts_symfd); | |
592 __set_errno (saved_errno); | |
593 p->fts_errno = errno; | |
594 SET(FTS_STOP); | |
595 } | |
596 (void)close(p->fts_symfd); | |
597 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
598 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
599 p->fts_errno = errno; | |
600 SET(FTS_STOP); | |
601 } | |
602 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
603 if (p->fts_errno == 0) | |
604 LEAVE_DIR (sp, p, "3"); | |
605 sp->fts_cur = p; | |
606 return ISSET(FTS_STOP) ? NULL : p; | |
607 } | |
608 | |
609 /* | |
610 * Fts_set takes the stream as an argument although it's not used in this | |
611 * implementation; it would be necessary if anyone wanted to add global | |
612 * semantics to fts using fts_set. An error return is allowed for similar | |
613 * reasons. | |
614 */ | |
615 /* ARGSUSED */ | |
616 int | |
617 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
618 { | |
619 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
620 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
621 __set_errno (EINVAL); | |
622 return (1); | |
623 } | |
624 p->fts_instr = instr; | |
625 return (0); | |
626 } | |
627 | |
628 FTSENT * | |
629 fts_children (register FTS *sp, int instr) | |
630 { | |
631 register FTSENT *p; | |
632 int fd; | |
633 | |
634 if (instr != 0 && instr != FTS_NAMEONLY) { | |
635 __set_errno (EINVAL); | |
636 return (NULL); | |
637 } | |
638 | |
639 /* Set current node pointer. */ | |
640 p = sp->fts_cur; | |
641 | |
642 /* | |
643 * Errno set to 0 so user can distinguish empty directory from | |
644 * an error. | |
645 */ | |
646 __set_errno (0); | |
647 | |
648 /* Fatal errors stop here. */ | |
649 if (ISSET(FTS_STOP)) | |
650 return (NULL); | |
651 | |
652 /* Return logical hierarchy of user's arguments. */ | |
653 if (p->fts_info == FTS_INIT) | |
654 return (p->fts_link); | |
655 | |
656 /* | |
657 * If not a directory being visited in pre-order, stop here. Could | |
658 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
659 * same effect is available with FTS_AGAIN. | |
660 */ | |
661 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
662 return (NULL); | |
663 | |
664 /* Free up any previous child list. */ | |
665 if (sp->fts_child != NULL) | |
666 fts_lfree(sp->fts_child); | |
667 | |
668 if (instr == FTS_NAMEONLY) { | |
669 SET(FTS_NAMEONLY); | |
670 instr = BNAMES; | |
671 } else | |
672 instr = BCHILD; | |
673 | |
674 /* | |
5907 | 675 * If using chdir on a relative file name and called BEFORE fts_read |
676 * does its chdir to the root of a traversal, we can lose -- we need to | |
5858 | 677 * chdir into the subdirectory, and we don't know where the current |
678 * directory is, so we can't get back so that the upcoming chdir by | |
679 * fts_read will work. | |
680 */ | |
681 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
682 ISSET(FTS_NOCHDIR)) | |
683 return (sp->fts_child = fts_build(sp, instr)); | |
684 | |
685 if ((fd = diropen (".")) < 0) | |
686 return (sp->fts_child = NULL); | |
687 sp->fts_child = fts_build(sp, instr); | |
688 if (fchdir(fd)) { | |
6611
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Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
689 int saved_errno = errno; |
5858 | 690 (void)close(fd); |
6611
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Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
691 __set_errno (saved_errno); |
5858 | 692 return (NULL); |
693 } | |
694 (void)close(fd); | |
695 return (sp->fts_child); | |
696 } | |
697 | |
698 /* | |
699 * This is the tricky part -- do not casually change *anything* in here. The | |
700 * idea is to build the linked list of entries that are used by fts_children | |
701 * and fts_read. There are lots of special cases. | |
702 * | |
703 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
704 * set and it's a physical walk (so that symbolic links can't be directories), | |
705 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
706 * of the file is in the directory entry. Otherwise, we assume that the number | |
707 * of subdirectories in a node is equal to the number of links to the parent. | |
708 * The former skips all stat calls. The latter skips stat calls in any leaf | |
709 * directories and for any files after the subdirectories in the directory have | |
710 * been found, cutting the stat calls by about 2/3. | |
711 */ | |
712 static FTSENT * | |
713 internal_function | |
714 fts_build (register FTS *sp, int type) | |
715 { | |
716 register struct dirent *dp; | |
717 register FTSENT *p, *head; | |
718 register size_t nitems; | |
719 FTSENT *cur, *tail; | |
720 DIR *dirp; | |
721 void *oldaddr; | |
722 int cderrno; | |
723 int saved_errno; | |
724 bool descend; | |
725 bool doadjust; | |
726 ptrdiff_t level; | |
727 nlink_t nlinks; | |
728 bool nostat; | |
729 size_t len, maxlen, new_len; | |
730 char *cp; | |
731 | |
732 /* Set current node pointer. */ | |
733 cur = sp->fts_cur; | |
734 | |
735 /* | |
736 * Open the directory for reading. If this fails, we're done. | |
737 * If being called from fts_read, set the fts_info field. | |
738 */ | |
739 #if defined FTS_WHITEOUT && 0 | |
740 if (ISSET(FTS_WHITEOUT)) | |
741 oflag = DTF_NODUP|DTF_REWIND; | |
742 else | |
743 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
744 #else | |
5907 | 745 # define __opendir2(file, flag) opendir(file) |
5858 | 746 #endif |
747 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
748 if (type == BREAD) { | |
749 cur->fts_info = FTS_DNR; | |
750 cur->fts_errno = errno; | |
751 } | |
752 return (NULL); | |
753 } | |
754 | |
755 /* | |
756 * Nlinks is the number of possible entries of type directory in the | |
757 * directory if we're cheating on stat calls, 0 if we're not doing | |
758 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
759 */ | |
760 if (type == BNAMES) { | |
761 nlinks = 0; | |
762 /* Be quiet about nostat, GCC. */ | |
763 nostat = false; | |
764 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
765 nlinks = (cur->fts_statp->st_nlink | |
766 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
767 nostat = true; | |
768 } else { | |
769 nlinks = -1; | |
770 nostat = false; | |
771 } | |
772 | |
773 /* | |
774 * If we're going to need to stat anything or we want to descend | |
775 * and stay in the directory, chdir. If this fails we keep going, | |
776 * but set a flag so we don't chdir after the post-order visit. | |
777 * We won't be able to stat anything, but we can still return the | |
778 * names themselves. Note, that since fts_read won't be able to | |
5907 | 779 * chdir into the directory, it will have to return different file |
5858 | 780 * names than before, i.e. "a/b" instead of "b". Since the node |
781 * has already been visited in pre-order, have to wait until the | |
782 * post-order visit to return the error. There is a special case | |
783 * here, if there was nothing to stat then it's not an error to | |
784 * not be able to stat. This is all fairly nasty. If a program | |
785 * needed sorted entries or stat information, they had better be | |
786 * checking FTS_NS on the returned nodes. | |
787 */ | |
788 cderrno = 0; | |
789 if (nlinks || type == BREAD) { | |
790 if (fts_safe_changedir(sp, cur, dirfd(dirp), NULL)) { | |
791 if (nlinks && type == BREAD) | |
792 cur->fts_errno = errno; | |
793 cur->fts_flags |= FTS_DONTCHDIR; | |
794 descend = false; | |
795 cderrno = errno; | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
796 closedir(dirp); |
5858 | 797 dirp = NULL; |
798 } else | |
799 descend = true; | |
800 } else | |
801 descend = false; | |
802 | |
803 /* | |
804 * Figure out the max file name length that can be stored in the | |
5907 | 805 * current buffer -- the inner loop allocates more space as necessary. |
5858 | 806 * We really wouldn't have to do the maxlen calculations here, we |
5907 | 807 * could do them in fts_read before returning the name, but it's a |
5858 | 808 * lot easier here since the length is part of the dirent structure. |
809 * | |
810 * If not changing directories set a pointer so that can just append | |
5907 | 811 * each new component into the file name. |
5858 | 812 */ |
813 len = NAPPEND(cur); | |
814 if (ISSET(FTS_NOCHDIR)) { | |
815 cp = sp->fts_path + len; | |
816 *cp++ = '/'; | |
817 } else { | |
818 /* GCC, you're too verbose. */ | |
819 cp = NULL; | |
820 } | |
821 len++; | |
822 maxlen = sp->fts_pathlen - len; | |
823 | |
824 level = cur->fts_level + 1; | |
825 | |
826 /* Read the directory, attaching each entry to the `link' pointer. */ | |
827 doadjust = false; | |
828 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
829 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) | |
830 continue; | |
831 | |
832 if ((p = fts_alloc(sp, dp->d_name, NAMLEN (dp))) == NULL) | |
833 goto mem1; | |
834 if (NAMLEN (dp) >= maxlen) {/* include space for NUL */ | |
835 oldaddr = sp->fts_path; | |
836 if (! fts_palloc(sp, NAMLEN (dp) + len + 1)) { | |
837 /* | |
5907 | 838 * No more memory. Save |
5858 | 839 * errno, free up the current structure and the |
840 * structures already allocated. | |
841 */ | |
842 mem1: saved_errno = errno; | |
843 if (p) | |
844 free(p); | |
845 fts_lfree(head); | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
846 closedir(dirp); |
5858 | 847 cur->fts_info = FTS_ERR; |
848 SET(FTS_STOP); | |
849 __set_errno (saved_errno); | |
850 return (NULL); | |
851 } | |
852 /* Did realloc() change the pointer? */ | |
853 if (oldaddr != sp->fts_path) { | |
854 doadjust = true; | |
855 if (ISSET(FTS_NOCHDIR)) | |
856 cp = sp->fts_path + len; | |
857 } | |
858 maxlen = sp->fts_pathlen - len; | |
859 } | |
860 | |
861 new_len = len + NAMLEN (dp); | |
862 if (new_len < len) { | |
863 /* | |
864 * In the unlikely even that we would end up | |
5907 | 865 * with a file name longer than SIZE_MAX, free up |
5858 | 866 * the current structure and the structures already |
867 * allocated, then error out with ENAMETOOLONG. | |
868 */ | |
869 free(p); | |
870 fts_lfree(head); | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
871 closedir(dirp); |
5858 | 872 cur->fts_info = FTS_ERR; |
873 SET(FTS_STOP); | |
874 __set_errno (ENAMETOOLONG); | |
875 return (NULL); | |
876 } | |
877 p->fts_level = level; | |
878 p->fts_parent = sp->fts_cur; | |
879 p->fts_pathlen = new_len; | |
880 | |
881 #if defined FTS_WHITEOUT && 0 | |
882 if (dp->d_type == DT_WHT) | |
883 p->fts_flags |= FTS_ISW; | |
884 #endif | |
885 | |
886 if (cderrno) { | |
887 if (nlinks) { | |
888 p->fts_info = FTS_NS; | |
889 p->fts_errno = cderrno; | |
890 } else | |
891 p->fts_info = FTS_NSOK; | |
892 p->fts_accpath = cur->fts_accpath; | |
893 } else if (nlinks == 0 | |
894 #if HAVE_STRUCT_DIRENT_D_TYPE | |
895 || (nostat && | |
896 dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN) | |
897 #endif | |
898 ) { | |
899 p->fts_accpath = | |
900 ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name; | |
901 p->fts_info = FTS_NSOK; | |
902 } else { | |
903 /* Build a file name for fts_stat to stat. */ | |
904 if (ISSET(FTS_NOCHDIR)) { | |
905 p->fts_accpath = p->fts_path; | |
906 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
907 } else | |
908 p->fts_accpath = p->fts_name; | |
909 /* Stat it. */ | |
910 p->fts_info = fts_stat(sp, p, false); | |
911 | |
912 /* Decrement link count if applicable. */ | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
913 if (nlinks > 0 && (p->fts_info == FTS_D || |
5858 | 914 p->fts_info == FTS_DC || p->fts_info == FTS_DOT)) |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
915 nlinks -= nostat; |
5858 | 916 } |
917 | |
918 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
919 p->fts_link = NULL; | |
920 if (head == NULL) | |
921 head = tail = p; | |
922 else { | |
923 tail->fts_link = p; | |
924 tail = p; | |
925 } | |
926 ++nitems; | |
927 } | |
928 if (dirp) | |
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
929 closedir(dirp); |
5858 | 930 |
931 /* | |
5907 | 932 * If realloc() changed the address of the file name, adjust the |
5858 | 933 * addresses for the rest of the tree and the dir list. |
934 */ | |
935 if (doadjust) | |
936 fts_padjust(sp, head); | |
937 | |
938 /* | |
5907 | 939 * If not changing directories, reset the file name back to original |
5858 | 940 * state. |
941 */ | |
942 if (ISSET(FTS_NOCHDIR)) { | |
943 if (len == sp->fts_pathlen || nitems == 0) | |
944 --cp; | |
945 *cp = '\0'; | |
946 } | |
947 | |
948 /* | |
949 * If descended after called from fts_children or after called from | |
950 * fts_read and nothing found, get back. At the root level we use | |
5907 | 951 * the saved fd; if one of fts_open()'s arguments is a relative name |
5858 | 952 * to an empty directory, we wind up here with no other way back. If |
953 * can't get back, we're done. | |
954 */ | |
955 if (descend && (type == BCHILD || !nitems) && | |
956 (cur->fts_level == FTS_ROOTLEVEL ? | |
957 FCHDIR(sp, sp->fts_rfd) : | |
958 fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
959 cur->fts_info = FTS_ERR; | |
960 SET(FTS_STOP); | |
961 return (NULL); | |
962 } | |
963 | |
964 /* If didn't find anything, return NULL. */ | |
965 if (!nitems) { | |
966 if (type == BREAD) | |
967 cur->fts_info = FTS_DP; | |
968 return (NULL); | |
969 } | |
970 | |
971 /* Sort the entries. */ | |
972 if (sp->fts_compar && nitems > 1) | |
973 head = fts_sort(sp, head, nitems); | |
974 return (head); | |
975 } | |
976 | |
977 #if FTS_DEBUG | |
978 | |
979 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
980 current hierarchy. There should be a directory with dev/inode | |
981 matching those of AD. If not, print a lot of diagnostics. */ | |
982 static void | |
983 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
984 { | |
985 FTSENT const *ent; | |
986 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
987 { | |
988 if (ad->ino == ent->fts_statp->st_ino | |
989 && ad->dev == ent->fts_statp->st_dev) | |
990 return; | |
991 } | |
992 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
993 printf ("active dirs:\n"); | |
994 for (ent = e_curr; | |
995 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
996 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
997 ad->fts_ent->fts_accpath, | |
998 (uintmax_t) ad->dev, | |
999 (uintmax_t) ad->ino, | |
1000 ent->fts_accpath, | |
1001 (uintmax_t) ent->fts_statp->st_dev, | |
1002 (uintmax_t) ent->fts_statp->st_ino); | |
1003 } | |
1004 | |
1005 void | |
1006 fts_cross_check (FTS const *sp) | |
1007 { | |
1008 FTSENT const *ent = sp->fts_cur; | |
1009 FTSENT const *t; | |
1010 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
1011 return; | |
1012 | |
1013 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
1014 /* Make sure every parent dir is in the tree. */ | |
1015 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
1016 { | |
1017 struct Active_dir ad; | |
1018 ad.ino = t->fts_statp->st_ino; | |
1019 ad.dev = t->fts_statp->st_dev; | |
6034
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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parents:
5907
diff
changeset
|
1020 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
5858 | 1021 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
1022 } | |
1023 | |
1024 /* Make sure every dir in the tree is an active dir. | |
1025 But ENT is not necessarily a directory. If so, just skip this part. */ | |
1026 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
1027 && (ent->fts_info == FTS_DP | |
1028 || ent->fts_info == FTS_D)) | |
1029 { | |
1030 struct Active_dir *ad; | |
6034
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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parents:
5907
diff
changeset
|
1031 for (ad = hash_get_first (sp->fts_cycle.ht); ad != NULL; |
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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parents:
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diff
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|
1032 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
5858 | 1033 { |
1034 find_matching_ancestor (ent, ad); | |
1035 } | |
1036 } | |
1037 } | |
1038 #endif | |
1039 | |
1040 static unsigned short int | |
1041 internal_function | |
1042 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
1043 { | |
1044 struct stat *sbp = p->fts_statp; | |
1045 int saved_errno; | |
1046 | |
1047 #if defined FTS_WHITEOUT && 0 | |
1048 /* check for whiteout */ | |
1049 if (p->fts_flags & FTS_ISW) { | |
1050 memset(sbp, '\0', sizeof (*sbp)); | |
1051 sbp->st_mode = S_IFWHT; | |
1052 return (FTS_W); | |
1053 } | |
1054 #endif | |
1055 | |
1056 /* | |
1057 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
1058 * a stat(2). If that fails, check for a non-existent symlink. If | |
1059 * fail, set the errno from the stat call. | |
1060 */ | |
1061 if (ISSET(FTS_LOGICAL) || follow) { | |
1062 if (stat(p->fts_accpath, sbp)) { | |
1063 saved_errno = errno; | |
6611
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6540
diff
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1064 if (errno == ENOENT |
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diff
changeset
|
1065 && lstat(p->fts_accpath, sbp) == 0) { |
5858 | 1066 __set_errno (0); |
1067 return (FTS_SLNONE); | |
1068 } | |
1069 p->fts_errno = saved_errno; | |
1070 goto err; | |
1071 } | |
1072 } else if (lstat(p->fts_accpath, sbp)) { | |
1073 p->fts_errno = errno; | |
1074 err: memset(sbp, 0, sizeof(struct stat)); | |
1075 return (FTS_NS); | |
1076 } | |
1077 | |
1078 if (S_ISDIR(sbp->st_mode)) { | |
1079 if (ISDOT(p->fts_name)) | |
1080 return (FTS_DOT); | |
5872 | 1081 |
1082 #if _LGPL_PACKAGE | |
1083 { | |
1084 /* | |
1085 * Cycle detection is done by brute force when the directory | |
1086 * is first encountered. If the tree gets deep enough or the | |
1087 * number of symbolic links to directories is high enough, | |
1088 * something faster might be worthwhile. | |
1089 */ | |
1090 FTSENT *t; | |
1091 | |
1092 for (t = p->fts_parent; | |
1093 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
1094 if (sbp->st_ino == t->fts_statp->st_ino | |
1095 && sbp->st_dev == t->fts_statp->st_dev) | |
1096 { | |
1097 p->fts_cycle = t; | |
1098 return (FTS_DC); | |
1099 } | |
1100 } | |
1101 #endif | |
1102 | |
5858 | 1103 return (FTS_D); |
1104 } | |
1105 if (S_ISLNK(sbp->st_mode)) | |
1106 return (FTS_SL); | |
1107 if (S_ISREG(sbp->st_mode)) | |
1108 return (FTS_F); | |
1109 return (FTS_DEFAULT); | |
1110 } | |
1111 | |
1112 static int | |
1113 fts_compar (void const *a, void const *b) | |
1114 { | |
1115 /* Convert A and B to the correct types, to pacify the compiler, and | |
1116 for portability to bizarre hosts where "void const *" and "FTSENT | |
1117 const **" differ in runtime representation. The comparison | |
1118 function cannot modify *a and *b, but there is no compile-time | |
1119 check for this. */ | |
1120 FTSENT const **pa = (FTSENT const **) a; | |
1121 FTSENT const **pb = (FTSENT const **) b; | |
1122 return pa[0]->fts_fts->fts_compar (pa, pb); | |
1123 } | |
1124 | |
1125 static FTSENT * | |
1126 internal_function | |
1127 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
1128 { | |
1129 register FTSENT **ap, *p; | |
1130 | |
1131 /* On most modern hosts, void * and FTSENT ** have the same | |
1132 run-time representation, and one can convert sp->fts_compar to | |
1133 the type qsort expects without problem. Use the heuristic that | |
1134 this is OK if the two pointer types are the same size, and if | |
1135 converting FTSENT ** to long int is the same as converting | |
1136 FTSENT ** to void * and then to long int. This heuristic isn't | |
1137 valid in general but we don't know of any counterexamples. */ | |
1138 FTSENT *dummy; | |
1139 int (*compare) (void const *, void const *) = | |
1140 ((sizeof &dummy == sizeof (void *) | |
1141 && (long int) &dummy == (long int) (void *) &dummy) | |
1142 ? (int (*) (void const *, void const *)) sp->fts_compar | |
1143 : fts_compar); | |
1144 | |
1145 /* | |
1146 * Construct an array of pointers to the structures and call qsort(3). | |
1147 * Reassemble the array in the order returned by qsort. If unable to | |
1148 * sort for memory reasons, return the directory entries in their | |
1149 * current order. Allocate enough space for the current needs plus | |
1150 * 40 so don't realloc one entry at a time. | |
1151 */ | |
1152 if (nitems > sp->fts_nitems) { | |
1153 struct _ftsent **a; | |
1154 | |
1155 sp->fts_nitems = nitems + 40; | |
1156 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
1157 || ! (a = realloc (sp->fts_array, | |
1158 sp->fts_nitems * sizeof *a))) { | |
1159 free(sp->fts_array); | |
1160 sp->fts_array = NULL; | |
1161 sp->fts_nitems = 0; | |
1162 return (head); | |
1163 } | |
1164 sp->fts_array = a; | |
1165 } | |
1166 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
1167 *ap++ = p; | |
1168 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
1169 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
1170 ap[0]->fts_link = ap[1]; | |
1171 ap[0]->fts_link = NULL; | |
1172 return (head); | |
1173 } | |
1174 | |
1175 static FTSENT * | |
1176 internal_function | |
1177 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
1178 { | |
1179 register FTSENT *p; | |
1180 size_t len; | |
1181 | |
1182 /* | |
1183 * The file name is a variable length array. Allocate the FTSENT | |
1184 * structure and the file name in one chunk. | |
1185 */ | |
1186 len = sizeof(FTSENT) + namelen; | |
1187 if ((p = malloc(len)) == NULL) | |
1188 return (NULL); | |
1189 | |
1190 /* Copy the name and guarantee NUL termination. */ | |
1191 memmove(p->fts_name, name, namelen); | |
1192 p->fts_name[namelen] = '\0'; | |
1193 | |
1194 p->fts_namelen = namelen; | |
1195 p->fts_fts = sp; | |
1196 p->fts_path = sp->fts_path; | |
1197 p->fts_errno = 0; | |
1198 p->fts_flags = 0; | |
1199 p->fts_instr = FTS_NOINSTR; | |
1200 p->fts_number = 0; | |
1201 p->fts_pointer = NULL; | |
1202 return (p); | |
1203 } | |
1204 | |
1205 static void | |
1206 internal_function | |
1207 fts_lfree (register FTSENT *head) | |
1208 { | |
1209 register FTSENT *p; | |
1210 | |
1211 /* Free a linked list of structures. */ | |
1212 while ((p = head)) { | |
1213 head = head->fts_link; | |
1214 free(p); | |
1215 } | |
1216 } | |
1217 | |
1218 /* | |
5907 | 1219 * Allow essentially unlimited file name lengths; find, rm, ls should |
1220 * all work on any tree. Most systems will allow creation of file | |
1221 * names much longer than MAXPATHLEN, even though the kernel won't | |
1222 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
1223 * so don't realloc the file name 2 bytes at a time. | |
5858 | 1224 */ |
1225 static bool | |
1226 internal_function | |
1227 fts_palloc (FTS *sp, size_t more) | |
1228 { | |
1229 char *p; | |
1230 size_t new_len = sp->fts_pathlen + more + 256; | |
1231 | |
1232 /* | |
1233 * See if fts_pathlen would overflow. | |
1234 */ | |
1235 if (new_len < sp->fts_pathlen) { | |
1236 if (sp->fts_path) { | |
1237 free(sp->fts_path); | |
1238 sp->fts_path = NULL; | |
1239 } | |
1240 sp->fts_path = NULL; | |
1241 __set_errno (ENAMETOOLONG); | |
1242 return false; | |
1243 } | |
1244 sp->fts_pathlen = new_len; | |
1245 p = realloc(sp->fts_path, sp->fts_pathlen); | |
1246 if (p == NULL) { | |
1247 free(sp->fts_path); | |
1248 sp->fts_path = NULL; | |
1249 return false; | |
1250 } | |
1251 sp->fts_path = p; | |
1252 return true; | |
1253 } | |
1254 | |
1255 /* | |
5907 | 1256 * When the file name is realloc'd, have to fix all of the pointers in |
1257 * structures already returned. | |
5858 | 1258 */ |
1259 static void | |
1260 internal_function | |
1261 fts_padjust (FTS *sp, FTSENT *head) | |
1262 { | |
1263 FTSENT *p; | |
1264 char *addr = sp->fts_path; | |
1265 | |
1266 #define ADJUST(p) do { \ | |
1267 if ((p)->fts_accpath != (p)->fts_name) { \ | |
1268 (p)->fts_accpath = \ | |
1269 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
1270 } \ | |
1271 (p)->fts_path = addr; \ | |
1272 } while (0) | |
1273 /* Adjust the current set of children. */ | |
1274 for (p = sp->fts_child; p; p = p->fts_link) | |
1275 ADJUST(p); | |
1276 | |
1277 /* Adjust the rest of the tree, including the current level. */ | |
1278 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
1279 ADJUST(p); | |
1280 p = p->fts_link ? p->fts_link : p->fts_parent; | |
1281 } | |
1282 } | |
1283 | |
1284 static size_t | |
1285 internal_function | |
1286 fts_maxarglen (char * const *argv) | |
1287 { | |
1288 size_t len, max; | |
1289 | |
1290 for (max = 0; *argv; ++argv) | |
1291 if ((len = strlen(*argv)) > max) | |
1292 max = len; | |
1293 return (max + 1); | |
1294 } | |
1295 | |
1296 /* | |
5907 | 1297 * Change to dir specified by fd or file name without getting |
5858 | 1298 * tricked by someone changing the world out from underneath us. |
1299 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
1300 */ | |
1301 static int | |
1302 internal_function | |
5907 | 1303 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
5858 | 1304 { |
1305 int ret, oerrno, newfd; | |
1306 struct stat sb; | |
1307 | |
1308 newfd = fd; | |
1309 if (ISSET(FTS_NOCHDIR)) | |
1310 return (0); | |
6034
96149b1bbb32
(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
Jim Meyering <jim@meyering.net>
parents:
5907
diff
changeset
|
1311 if (fd < 0 && (newfd = diropen (dir)) < 0) |
5858 | 1312 return (-1); |
1313 if (fstat(newfd, &sb)) { | |
1314 ret = -1; | |
1315 goto bail; | |
1316 } | |
1317 if (p->fts_statp->st_dev != sb.st_dev | |
1318 || p->fts_statp->st_ino != sb.st_ino) { | |
1319 __set_errno (ENOENT); /* disinformation */ | |
1320 ret = -1; | |
1321 goto bail; | |
1322 } | |
1323 ret = fchdir(newfd); | |
1324 bail: | |
1325 oerrno = errno; | |
1326 if (fd < 0) | |
1327 (void)close(newfd); | |
1328 __set_errno (oerrno); | |
1329 return (ret); | |
1330 } |