Mercurial > gnulib
annotate lib/fts.c @ 7302:8a1a9361108c
* _fpending.c: Include <config.h> unconditionally, since we no
longer worry about uses that don't define HAVE_CONFIG_H.
* acl.c, alloca.c, argmatch.c, atexit.c, backupfile.c:
* basename.c, c-stack.c, c-strtod.c, calloc.c, canon-host.c:
* canonicalize.c, chdir-long.c, chdir-safer.c, chown.c:
* cloexec.c, close-stream.c, closeout.c, creat-safer.c:
* cycle-check.c, diacrit.c, dirchownmod.c, dirfd.c, dirname.c:
* dup-safer.c, dup2.c, error.c, euidaccess.c, exclude.c:
* exitfail.c, fchmodat.c, fchown-stub.c, fd-safer.c:
* file-type.c, fileblocks.c, filemode.c, filenamecat.c:
* fnmatch.c, fopen-safer.c, fprintftime.c, free.c, fsusage.c:
* ftruncate.c, fts-cycle.c, fts.c, full-write.c, gai_strerror.c:
* getcwd.c, getdate.y, getdomainname.c, getgroups.c:
* gethostname.c, gethrxtime.c, getloadavg.c, getlogin_r.c:
* getndelim2.c, getnline.c, getopt.c, getopt1.c, getpass.c:
* gettime.c, gettimeofday.c, getugroups.c, getusershell.c:
* glob.c, group-member.c, hard-locale.c, hash-pjw.c, hash.c:
* human.c, idcache.c, inet_ntop.c, inet_pton.c, inttostr.c:
* isdir.c, lchown.c, linebuffer.c, long-options.c, lstat.c:
* malloc.c, md5.c, memcasecmp.c, memchr.c, memcmp.c, memcoll.c:
* memcpy.c, memmove.c, memrchr.c, mkancesdirs.c, mkdir-p.c:
* mkdir.c, mkdirat.c, mkstemp-safer.c, mkstemp.c, modechange.c:
* mountlist.c, nanosleep.c, obstack.c, open-safer.c:
* openat-die.c, openat.c, pagealign_alloc.c, physmem.c:
* pipe-safer.c, posixtm.c, posixver.c, putenv.c, quote.c:
* quotearg.c, raise.c, readtokens.c, readtokens0.c, readutmp.c:
* realloc.c, regex.c, rename.c, rmdir.c, rpmatch.c, safe-read.c:
* same.c, save-cwd.c, savedir.c, setenv.c, settime.c, sha1.c:
* sig2str.c, snprintf.c, strdup.c, strerror.c, strftime.c:
* stripslash.c, strndup.c, strnlen.c, strpbrk.c, strtod.c:
* strtoimax.c, strtol.c, strverscmp.c, tempname.c, time_r.c:
* timegm.c, tmpfile-safer.c, unlinkdir.c, userspec.c, utime.c:
* utimecmp.c, utimens.c, version-etc-fsf.c, version-etc.c:
* xalloc-die.c, xgetcwd.c, xgethostname.c, xmalloc.c:
* xmemcoll.c, xnanosleep.c, xreadlink.c, xstrtod.c:
* xstrtoimax.c, xstrtol.c, xstrtoumax.c, yesno.c:
Likewise.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Wed, 13 Sep 2006 22:38:14 +0000 |
| parents | 3307ae6ea2e5 |
| children | 6f79ccad009d |
| 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 | |
|
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* _fpending.c: Include <config.h> unconditionally, since we no
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48 #include <config.h> |
| 5858 | 49 |
| 50 #if defined(LIBC_SCCS) && !defined(lint) | |
| 51 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; | |
| 52 #endif /* LIBC_SCCS and not lint */ | |
| 53 | |
|
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* fts.c: Include fts_.h first, to check interface.
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54 #include "fts_.h" |
|
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55 |
| 5858 | 56 #if HAVE_SYS_PARAM_H || defined _LIBC |
| 57 # include <sys/param.h> | |
| 58 #endif | |
| 59 #ifdef _LIBC | |
| 60 # include <include/sys/stat.h> | |
| 61 #else | |
| 62 # include <sys/stat.h> | |
| 63 #endif | |
| 64 #include <fcntl.h> | |
| 65 #include <errno.h> | |
| 66 #include "dirfd.h" | |
|
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67 #include <stdbool.h> |
| 5858 | 68 #include <stdlib.h> |
| 69 #include <string.h> | |
| 70 #include <unistd.h> | |
| 71 | |
|
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(fts_cross_check) [FTS_DEBUG]: s/active_dir_ht/fts_cycle.ht/.
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72 #if ! _LIBC |
| 7151 | 73 # include "fcntl--.h" |
|
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74 # include "lstat.h" |
| 7151 | 75 # include "openat.h" |
| 76 # include "unistd--.h" | |
|
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77 #endif |
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78 |
|
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* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
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79 #include <dirent.h> |
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* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
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80 #ifndef _D_EXACT_NAMLEN |
|
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81 # define _D_EXACT_NAMLEN(dirent) strlen ((dirent)->d_name) |
| 5858 | 82 #endif |
| 83 | |
| 84 #ifdef _LIBC | |
| 85 # undef close | |
| 86 # define close __close | |
| 87 # undef closedir | |
| 88 # define closedir __closedir | |
| 89 # undef fchdir | |
| 90 # define fchdir __fchdir | |
| 91 # undef open | |
| 92 # define open __open | |
| 93 # undef opendir | |
| 94 # define opendir __opendir | |
| 95 # undef readdir | |
| 96 # define readdir __readdir | |
| 97 #else | |
| 98 # undef internal_function | |
| 99 # define internal_function /* empty */ | |
| 100 #endif | |
| 101 | |
| 102 #ifndef __set_errno | |
| 103 # define __set_errno(Val) errno = (Val) | |
| 104 #endif | |
| 105 | |
| 106 #ifndef __attribute__ | |
| 107 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ | |
| 108 # define __attribute__(x) /* empty */ | |
| 109 # endif | |
| 110 #endif | |
| 111 | |
| 112 #ifndef ATTRIBUTE_UNUSED | |
| 113 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
| 114 #endif | |
| 115 | |
| 7151 | 116 /* If this host provides the openat function, then we can avoid |
| 117 attempting to open "." in some initialization code below. */ | |
| 118 #ifdef HAVE_OPENAT | |
| 119 # define HAVE_OPENAT_SUPPORT 1 | |
| 120 #else | |
| 121 # define HAVE_OPENAT_SUPPORT 0 | |
| 122 #endif | |
| 5858 | 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 | |
|
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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]))) | |
| 7151 | 159 #define STREQ(a, b) (strcmp ((a), (b)) == 0) |
| 5858 | 160 |
| 161 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
| 162 #define ISSET(opt) (sp->fts_options & (opt)) | |
| 163 #define SET(opt) (sp->fts_options |= (opt)) | |
| 164 | |
| 7151 | 165 #define RESTORE_INITIAL_CWD(sp) FCHDIR (sp, (ISSET (FTS_CWDFD) \ |
| 166 ? AT_FDCWD \ | |
| 167 : sp->fts_rfd)) | |
| 168 | |
| 169 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) \ | |
| 170 && (ISSET(FTS_CWDFD) \ | |
| 171 ? (cwd_advance_fd (sp, fd), 0) \ | |
| 172 : fchdir(fd))) | |
| 173 | |
| 5858 | 174 |
| 175 /* fts_build flags */ | |
| 176 #define BCHILD 1 /* fts_children */ | |
| 177 #define BNAMES 2 /* fts_children, names only */ | |
| 178 #define BREAD 3 /* fts_read */ | |
| 179 | |
| 180 #if FTS_DEBUG | |
|
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181 # include <inttypes.h> |
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182 # include <stdint.h> |
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183 # include <stdio.h> |
| 5858 | 184 bool fts_debug = false; |
| 185 # define Dprintf(x) do { if (fts_debug) printf x; } while (0) | |
| 186 #else | |
| 187 # define Dprintf(x) | |
| 188 #endif | |
| 189 | |
| 190 #define LEAVE_DIR(Fts, Ent, Tag) \ | |
| 5872 | 191 do \ |
| 192 { \ | |
| 5858 | 193 Dprintf ((" %s-leaving: %s\n", Tag, (Ent)->fts_path)); \ |
| 5872 | 194 leave_dir (Fts, Ent); \ |
| 195 } \ | |
| 196 while (false) | |
| 5858 | 197 |
| 7151 | 198 /* file-descriptor-relative opendir. */ |
| 199 /* FIXME: if others need this function, move it into lib/openat.c */ | |
| 200 static inline DIR * | |
| 201 internal_function | |
| 202 opendirat (int fd, char const *dir) | |
| 203 { | |
| 204 int new_fd = openat (fd, dir, O_RDONLY); | |
| 205 DIR *dirp; | |
| 206 | |
| 207 if (new_fd < 0) | |
| 208 return NULL; | |
| 209 dirp = fdopendir (new_fd); | |
| 210 if (dirp == NULL) | |
| 211 { | |
| 212 int saved_errno = errno; | |
| 213 close (new_fd); | |
| 214 errno = saved_errno; | |
| 215 } | |
| 216 return dirp; | |
| 217 } | |
| 218 | |
| 219 /* Virtual fchdir. Advance SP's working directory | |
| 220 file descriptor, SP->fts_cwd_fd, to FD, and close | |
| 221 the previous one, ignoring any error. */ | |
| 222 static void | |
| 223 internal_function | |
| 224 cwd_advance_fd (FTS *sp, int fd) | |
| 225 { | |
| 226 int old = sp->fts_cwd_fd; | |
| 227 if (old == fd && old != AT_FDCWD) | |
| 228 abort (); | |
| 229 sp->fts_cwd_fd = fd; | |
| 230 if (0 <= old) | |
| 231 close (old); /* ignore any close failure */ | |
| 232 } | |
| 233 | |
| 5858 | 234 /* Open the directory DIR if possible, and return a file |
| 235 descriptor. Return -1 and set errno on failure. It doesn't matter | |
| 236 whether the file descriptor has read or write access. */ | |
| 237 | |
| 7151 | 238 static inline int |
| 5858 | 239 internal_function |
| 7151 | 240 diropen (FTS const *sp, char const *dir) |
| 5858 | 241 { |
| 7151 | 242 int open_flags = (O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK |
| 243 | (ISSET (FTS_PHYSICAL) ? O_NOFOLLOW : 0)); | |
| 244 | |
| 245 return (ISSET (FTS_CWDFD) | |
| 246 ? openat (sp->fts_cwd_fd, dir, open_flags) | |
| 247 : open (dir, open_flags)); | |
| 5858 | 248 } |
| 249 | |
| 250 FTS * | |
| 251 fts_open (char * const *argv, | |
| 252 register int options, | |
| 253 int (*compar) (FTSENT const **, FTSENT const **)) | |
| 254 { | |
| 255 register FTS *sp; | |
| 256 register FTSENT *p, *root; | |
| 257 register size_t nitems; | |
| 7151 | 258 FTSENT *parent = NULL; |
| 259 FTSENT *tmp = NULL; /* pacify gcc */ | |
| 5858 | 260 size_t len; |
| 261 | |
| 262 /* Options check. */ | |
| 263 if (options & ~FTS_OPTIONMASK) { | |
| 264 __set_errno (EINVAL); | |
| 265 return (NULL); | |
| 266 } | |
| 7151 | 267 if ((options & FTS_NOCHDIR) && (options & FTS_CWDFD)) { |
| 268 __set_errno (EINVAL); | |
| 269 return (NULL); | |
| 270 } | |
| 271 if ( ! (options & (FTS_LOGICAL | FTS_PHYSICAL))) { | |
| 272 __set_errno (EINVAL); | |
| 273 return (NULL); | |
| 274 } | |
| 5858 | 275 |
| 276 /* Allocate/initialize the stream */ | |
| 277 if ((sp = malloc(sizeof(FTS))) == NULL) | |
| 278 return (NULL); | |
| 279 memset(sp, 0, sizeof(FTS)); | |
| 280 sp->fts_compar = compar; | |
| 281 sp->fts_options = options; | |
| 282 | |
| 283 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
| 7151 | 284 if (ISSET(FTS_LOGICAL)) { |
| 5858 | 285 SET(FTS_NOCHDIR); |
| 7151 | 286 CLR(FTS_CWDFD); |
| 287 } | |
| 288 | |
| 289 /* Initialize fts_cwd_fd. */ | |
| 290 sp->fts_cwd_fd = AT_FDCWD; | |
| 291 if ( ISSET(FTS_CWDFD) && ! HAVE_OPENAT_SUPPORT) | |
| 292 { | |
| 293 /* While it isn't technically necessary to open "." this | |
| 294 early, doing it here saves us the trouble of ensuring | |
| 295 later (where it'd be messier) that "." can in fact | |
| 296 be opened. If not, revert to FTS_NOCHDIR mode. */ | |
| 297 int fd = open (".", O_RDONLY); | |
| 298 if (fd < 0) | |
| 299 { | |
| 300 /* Even if `.' is unreadable, don't revert to FTS_NOCHDIR mode | |
| 301 on systems like Linux+PROC_FS, where our openat emulation | |
| 302 is good enough. Note: on a system that emulates | |
| 303 openat via /proc, this technique can still fail, but | |
| 304 only in extreme conditions, e.g., when the working | |
| 305 directory cannot be saved (i.e. save_cwd fails) -- | |
| 306 and that happens only on Linux only when "." is unreadable | |
| 307 and the CWD would be longer than PATH_MAX. | |
| 308 FIXME: once Linux kernel openat support is well established, | |
| 309 replace the above open call and this entire if/else block | |
| 310 with the body of the if-block below. */ | |
| 311 if ( openat_needs_fchdir ()) | |
| 312 { | |
| 313 SET(FTS_NOCHDIR); | |
| 314 CLR(FTS_CWDFD); | |
| 315 } | |
| 316 } | |
| 317 else | |
| 318 { | |
| 319 close (fd); | |
| 320 } | |
| 321 } | |
| 5858 | 322 |
| 323 /* | |
| 5907 | 324 * Start out with 1K of file name space, and enough, in any case, |
| 325 * to hold the user's file names. | |
| 5858 | 326 */ |
| 327 #ifndef MAXPATHLEN | |
| 328 # define MAXPATHLEN 1024 | |
| 329 #endif | |
|
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330 { |
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331 size_t maxarglen = fts_maxarglen(argv); |
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332 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
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333 goto mem1; |
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334 } |
| 5858 | 335 |
| 336 /* Allocate/initialize root's parent. */ | |
| 7151 | 337 if (*argv != NULL) { |
| 338 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
| 339 goto mem2; | |
| 340 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
| 341 } | |
| 5858 | 342 |
| 343 /* Allocate/initialize root(s). */ | |
| 344 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
| 5907 | 345 /* Don't allow zero-length file names. */ |
| 5858 | 346 if ((len = strlen(*argv)) == 0) { |
| 347 __set_errno (ENOENT); | |
| 348 goto mem3; | |
| 349 } | |
| 350 | |
| 351 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
| 352 goto mem3; | |
| 353 p->fts_level = FTS_ROOTLEVEL; | |
| 354 p->fts_parent = parent; | |
| 355 p->fts_accpath = p->fts_name; | |
| 356 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW) != 0); | |
| 357 | |
| 358 /* Command-line "." and ".." are real directories. */ | |
| 359 if (p->fts_info == FTS_DOT) | |
| 360 p->fts_info = FTS_D; | |
| 361 | |
| 362 /* | |
| 363 * If comparison routine supplied, traverse in sorted | |
| 364 * order; otherwise traverse in the order specified. | |
| 365 */ | |
| 366 if (compar) { | |
| 367 p->fts_link = root; | |
| 368 root = p; | |
| 369 } else { | |
| 370 p->fts_link = NULL; | |
| 371 if (root == NULL) | |
| 372 tmp = root = p; | |
| 373 else { | |
| 374 tmp->fts_link = p; | |
| 375 tmp = p; | |
| 376 } | |
| 377 } | |
| 378 } | |
| 379 if (compar && nitems > 1) | |
| 380 root = fts_sort(sp, root, nitems); | |
| 381 | |
| 382 /* | |
| 383 * Allocate a dummy pointer and make fts_read think that we've just | |
| 384 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
| 385 * so that everything about the "current" node is ignored. | |
| 386 */ | |
| 387 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
| 388 goto mem3; | |
| 389 sp->fts_cur->fts_link = root; | |
| 390 sp->fts_cur->fts_info = FTS_INIT; | |
| 5872 | 391 if (! setup_dir (sp)) |
| 392 goto mem3; | |
| 5858 | 393 |
| 394 /* | |
| 395 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
| 5907 | 396 * that we can get back here; this could be avoided for some file names, |
| 5858 | 397 * but almost certainly not worth the effort. Slashes, symbolic links, |
| 398 * and ".." are all fairly nasty problems. Note, if we can't get the | |
| 399 * descriptor we run anyway, just more slowly. | |
| 400 */ | |
| 7151 | 401 if (!ISSET(FTS_NOCHDIR) && !ISSET(FTS_CWDFD) |
| 402 && (sp->fts_rfd = diropen (sp, ".")) < 0) | |
| 5858 | 403 SET(FTS_NOCHDIR); |
| 404 | |
| 405 return (sp); | |
| 406 | |
| 407 mem3: fts_lfree(root); | |
| 408 free(parent); | |
| 409 mem2: free(sp->fts_path); | |
| 410 mem1: free(sp); | |
| 411 return (NULL); | |
| 412 } | |
| 413 | |
| 414 static void | |
| 415 internal_function | |
| 416 fts_load (FTS *sp, register FTSENT *p) | |
| 417 { | |
| 418 register size_t len; | |
| 419 register char *cp; | |
| 420 | |
| 421 /* | |
| 422 * Load the stream structure for the next traversal. Since we don't | |
| 423 * actually enter the directory until after the preorder visit, set | |
| 424 * the fts_accpath field specially so the chdir gets done to the right | |
| 425 * place and the user can access the first node. From fts_open it's | |
| 5907 | 426 * known that the file name will fit. |
| 5858 | 427 */ |
| 428 len = p->fts_pathlen = p->fts_namelen; | |
| 429 memmove(sp->fts_path, p->fts_name, len + 1); | |
| 430 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
| 431 len = strlen(++cp); | |
| 432 memmove(p->fts_name, cp, len + 1); | |
| 433 p->fts_namelen = len; | |
| 434 } | |
| 435 p->fts_accpath = p->fts_path = sp->fts_path; | |
| 436 sp->fts_dev = p->fts_statp->st_dev; | |
| 437 } | |
| 438 | |
| 439 int | |
| 440 fts_close (FTS *sp) | |
| 441 { | |
| 442 register FTSENT *freep, *p; | |
| 443 int saved_errno = 0; | |
| 444 | |
| 445 /* | |
| 446 * This still works if we haven't read anything -- the dummy structure | |
| 447 * points to the root list, so we step through to the end of the root | |
| 448 * list which has a valid parent pointer. | |
| 449 */ | |
| 450 if (sp->fts_cur) { | |
| 451 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 452 freep = p; | |
| 453 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
| 454 free(freep); | |
| 455 } | |
| 456 free(p); | |
| 457 } | |
| 458 | |
| 5907 | 459 /* Free up child linked list, sort array, file name buffer. */ |
| 5858 | 460 if (sp->fts_child) |
| 461 fts_lfree(sp->fts_child); | |
| 462 if (sp->fts_array) | |
| 463 free(sp->fts_array); | |
| 464 free(sp->fts_path); | |
| 465 | |
| 7151 | 466 if (ISSET(FTS_CWDFD)) |
| 467 { | |
| 468 if (0 <= sp->fts_cwd_fd) | |
| 469 close (sp->fts_cwd_fd); | |
| 470 } | |
| 471 else if (!ISSET(FTS_NOCHDIR)) | |
| 472 { | |
| 473 /* Return to original directory, save errno if necessary. */ | |
| 474 if (fchdir(sp->fts_rfd)) | |
| 475 saved_errno = errno; | |
| 476 close(sp->fts_rfd); | |
| 477 } | |
| 5858 | 478 |
| 5872 | 479 free_dir (sp); |
| 5858 | 480 |
| 481 /* Free up the stream pointer. */ | |
| 482 free(sp); | |
| 483 | |
| 484 /* Set errno and return. */ | |
| 485 if (saved_errno) { | |
| 486 __set_errno (saved_errno); | |
| 487 return (-1); | |
| 488 } | |
| 489 | |
| 490 return (0); | |
| 491 } | |
| 492 | |
| 493 /* | |
| 5907 | 494 * Special case of "/" at the end of the file name so that slashes aren't |
| 495 * appended which would cause file names to be written as "....//foo". | |
| 5858 | 496 */ |
| 497 #define NAPPEND(p) \ | |
| 498 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
| 499 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
| 500 | |
| 501 FTSENT * | |
| 502 fts_read (register FTS *sp) | |
| 503 { | |
| 504 register FTSENT *p, *tmp; | |
| 505 register unsigned short int instr; | |
| 506 register char *t; | |
| 507 | |
| 508 /* If finished or unrecoverable error, return NULL. */ | |
| 509 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
| 510 return (NULL); | |
| 511 | |
| 512 /* Set current node pointer. */ | |
| 513 p = sp->fts_cur; | |
| 514 | |
| 515 /* Save and zero out user instructions. */ | |
| 516 instr = p->fts_instr; | |
| 517 p->fts_instr = FTS_NOINSTR; | |
| 518 | |
| 519 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
| 520 if (instr == FTS_AGAIN) { | |
| 521 p->fts_info = fts_stat(sp, p, false); | |
| 522 return (p); | |
| 523 } | |
| 524 Dprintf (("fts_read: p=%s\n", | |
| 525 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
| 526 | |
| 527 /* | |
| 528 * Following a symlink -- SLNONE test allows application to see | |
| 529 * SLNONE and recover. If indirecting through a symlink, have | |
| 530 * keep a pointer to current location. If unable to get that | |
| 531 * pointer, follow fails. | |
| 532 */ | |
| 533 if (instr == FTS_FOLLOW && | |
| 534 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
| 535 p->fts_info = fts_stat(sp, p, true); | |
| 536 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 537 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 538 p->fts_errno = errno; |
| 539 p->fts_info = FTS_ERR; | |
| 540 } else | |
| 541 p->fts_flags |= FTS_SYMFOLLOW; | |
| 542 } | |
| 5872 | 543 goto check_for_dir; |
| 5858 | 544 } |
| 545 | |
| 546 /* Directory in pre-order. */ | |
| 547 if (p->fts_info == FTS_D) { | |
| 548 /* If skipped or crossed mount point, do post-order visit. */ | |
| 549 if (instr == FTS_SKIP || | |
| 550 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
| 551 if (p->fts_flags & FTS_SYMFOLLOW) | |
| 552 (void)close(p->fts_symfd); | |
| 553 if (sp->fts_child) { | |
| 554 fts_lfree(sp->fts_child); | |
| 555 sp->fts_child = NULL; | |
| 556 } | |
| 557 p->fts_info = FTS_DP; | |
| 558 LEAVE_DIR (sp, p, "1"); | |
| 559 return (p); | |
| 560 } | |
| 561 | |
| 562 /* Rebuild if only read the names and now traversing. */ | |
| 563 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
| 564 CLR(FTS_NAMEONLY); | |
| 565 fts_lfree(sp->fts_child); | |
| 566 sp->fts_child = NULL; | |
| 567 } | |
| 568 | |
| 569 /* | |
| 570 * Cd to the subdirectory. | |
| 571 * | |
| 572 * If have already read and now fail to chdir, whack the list | |
| 573 * to make the names come out right, and set the parent errno | |
| 574 * so the application will eventually get an error condition. | |
| 575 * Set the FTS_DONTCHDIR flag so that when we logically change | |
| 576 * directories back to the parent we don't do a chdir. | |
| 577 * | |
| 578 * If haven't read do so. If the read fails, fts_build sets | |
| 579 * FTS_STOP or the fts_info field of the node. | |
| 580 */ | |
| 581 if (sp->fts_child != NULL) { | |
| 582 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
| 583 p->fts_errno = errno; | |
| 584 p->fts_flags |= FTS_DONTCHDIR; | |
| 585 for (p = sp->fts_child; p != NULL; | |
| 586 p = p->fts_link) | |
| 587 p->fts_accpath = | |
| 588 p->fts_parent->fts_accpath; | |
| 589 } | |
| 590 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
| 591 if (ISSET(FTS_STOP)) | |
| 592 return (NULL); | |
| 593 /* If fts_build's call to fts_safe_changedir failed | |
| 594 because it was not able to fchdir into a | |
| 595 subdirectory, tell the caller. */ | |
| 596 if (p->fts_errno) | |
| 597 p->fts_info = FTS_ERR; | |
| 598 LEAVE_DIR (sp, p, "2"); | |
| 599 return (p); | |
| 600 } | |
| 601 p = sp->fts_child; | |
| 602 sp->fts_child = NULL; | |
| 603 goto name; | |
| 604 } | |
| 605 | |
| 606 /* Move to the next node on this level. */ | |
| 607 next: tmp = p; | |
| 608 if ((p = p->fts_link) != NULL) { | |
| 609 free(tmp); | |
| 610 | |
| 611 /* | |
| 612 * If reached the top, return to the original directory (or | |
| 5907 | 613 * the root of the tree), and load the file names for the next |
| 614 * root. | |
| 5858 | 615 */ |
| 616 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 617 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 618 SET(FTS_STOP); |
| 6540 | 619 sp->fts_cur = p; |
| 5858 | 620 return (NULL); |
| 621 } | |
| 622 fts_load(sp, p); | |
| 5872 | 623 goto check_for_dir; |
| 5858 | 624 } |
| 625 | |
| 626 /* | |
| 627 * User may have called fts_set on the node. If skipped, | |
| 628 * ignore. If followed, get a file descriptor so we can | |
| 629 * get back if necessary. | |
| 630 */ | |
| 631 if (p->fts_instr == FTS_SKIP) | |
| 632 goto next; | |
| 633 if (p->fts_instr == FTS_FOLLOW) { | |
| 634 p->fts_info = fts_stat(sp, p, true); | |
| 635 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 7151 | 636 if ((p->fts_symfd = diropen (sp, ".")) < 0) { |
| 5858 | 637 p->fts_errno = errno; |
| 638 p->fts_info = FTS_ERR; | |
| 639 } else | |
| 640 p->fts_flags |= FTS_SYMFOLLOW; | |
| 641 } | |
| 642 p->fts_instr = FTS_NOINSTR; | |
| 643 } | |
| 644 | |
| 645 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
| 646 *t++ = '/'; | |
| 647 memmove(t, p->fts_name, p->fts_namelen + 1); | |
| 5872 | 648 check_for_dir: |
| 649 sp->fts_cur = p; | |
| 5858 | 650 if (p->fts_info == FTS_D) |
| 5872 | 651 { |
| 652 Dprintf ((" %s-entering: %s\n", sp, p->fts_path)); | |
| 653 if (! enter_dir (sp, p)) | |
| 654 { | |
| 655 __set_errno (ENOMEM); | |
| 656 return NULL; | |
| 657 } | |
| 658 } | |
| 659 return p; | |
| 5858 | 660 } |
| 661 | |
| 662 /* Move up to the parent node. */ | |
| 663 p = tmp->fts_parent; | |
| 664 free(tmp); | |
| 665 | |
| 666 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
| 667 /* | |
| 668 * Done; free everything up and set errno to 0 so the user | |
| 669 * can distinguish between error and EOF. | |
| 670 */ | |
| 671 free(p); | |
| 672 __set_errno (0); | |
| 673 return (sp->fts_cur = NULL); | |
| 674 } | |
| 675 | |
| 5907 | 676 /* NUL terminate the file name. */ |
| 5858 | 677 sp->fts_path[p->fts_pathlen] = '\0'; |
| 678 | |
| 679 /* | |
| 7151 | 680 * Return to the parent directory. If at a root node, restore |
| 681 * the initial working directory. If we came through a symlink, | |
| 682 * go back through the file descriptor. Otherwise, move up | |
| 683 * one level, via "..". | |
| 5858 | 684 */ |
| 685 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 7151 | 686 if (RESTORE_INITIAL_CWD(sp)) { |
| 5858 | 687 p->fts_errno = errno; |
| 688 SET(FTS_STOP); | |
| 689 } | |
| 690 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
| 691 if (FCHDIR(sp, p->fts_symfd)) { | |
| 7151 | 692 int saved_errno = errno; |
| 5858 | 693 (void)close(p->fts_symfd); |
| 694 __set_errno (saved_errno); | |
| 695 p->fts_errno = errno; | |
| 696 SET(FTS_STOP); | |
| 697 } | |
| 698 (void)close(p->fts_symfd); | |
| 699 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
| 700 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
| 701 p->fts_errno = errno; | |
| 702 SET(FTS_STOP); | |
| 703 } | |
| 704 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
| 705 if (p->fts_errno == 0) | |
| 706 LEAVE_DIR (sp, p, "3"); | |
| 707 sp->fts_cur = p; | |
| 708 return ISSET(FTS_STOP) ? NULL : p; | |
| 709 } | |
| 710 | |
| 711 /* | |
| 712 * Fts_set takes the stream as an argument although it's not used in this | |
| 713 * implementation; it would be necessary if anyone wanted to add global | |
| 714 * semantics to fts using fts_set. An error return is allowed for similar | |
| 715 * reasons. | |
| 716 */ | |
| 717 /* ARGSUSED */ | |
| 718 int | |
| 719 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
| 720 { | |
| 721 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
| 722 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
| 723 __set_errno (EINVAL); | |
| 724 return (1); | |
| 725 } | |
| 726 p->fts_instr = instr; | |
| 727 return (0); | |
| 728 } | |
| 729 | |
| 730 FTSENT * | |
| 731 fts_children (register FTS *sp, int instr) | |
| 732 { | |
| 733 register FTSENT *p; | |
| 734 int fd; | |
| 735 | |
| 736 if (instr != 0 && instr != FTS_NAMEONLY) { | |
| 737 __set_errno (EINVAL); | |
| 738 return (NULL); | |
| 739 } | |
| 740 | |
| 741 /* Set current node pointer. */ | |
| 742 p = sp->fts_cur; | |
| 743 | |
| 744 /* | |
| 745 * Errno set to 0 so user can distinguish empty directory from | |
| 746 * an error. | |
| 747 */ | |
| 748 __set_errno (0); | |
| 749 | |
| 750 /* Fatal errors stop here. */ | |
| 751 if (ISSET(FTS_STOP)) | |
| 752 return (NULL); | |
| 753 | |
| 754 /* Return logical hierarchy of user's arguments. */ | |
| 755 if (p->fts_info == FTS_INIT) | |
| 756 return (p->fts_link); | |
| 757 | |
| 758 /* | |
| 759 * If not a directory being visited in pre-order, stop here. Could | |
| 760 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
| 761 * same effect is available with FTS_AGAIN. | |
| 762 */ | |
| 763 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
| 764 return (NULL); | |
| 765 | |
| 766 /* Free up any previous child list. */ | |
| 767 if (sp->fts_child != NULL) | |
| 768 fts_lfree(sp->fts_child); | |
| 769 | |
| 770 if (instr == FTS_NAMEONLY) { | |
| 771 SET(FTS_NAMEONLY); | |
| 772 instr = BNAMES; | |
| 773 } else | |
| 774 instr = BCHILD; | |
| 775 | |
| 776 /* | |
| 5907 | 777 * If using chdir on a relative file name and called BEFORE fts_read |
| 778 * does its chdir to the root of a traversal, we can lose -- we need to | |
| 5858 | 779 * chdir into the subdirectory, and we don't know where the current |
| 780 * directory is, so we can't get back so that the upcoming chdir by | |
| 781 * fts_read will work. | |
| 782 */ | |
| 783 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
| 784 ISSET(FTS_NOCHDIR)) | |
| 785 return (sp->fts_child = fts_build(sp, instr)); | |
| 786 | |
| 7151 | 787 if ((fd = diropen (sp, ".")) < 0) |
| 5858 | 788 return (sp->fts_child = NULL); |
| 789 sp->fts_child = fts_build(sp, instr); | |
| 7151 | 790 if (ISSET(FTS_CWDFD)) |
| 791 { | |
| 792 cwd_advance_fd (sp, fd); | |
| 793 } | |
| 794 else | |
| 795 { | |
| 796 if (fchdir(fd)) | |
| 797 { | |
|
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
798 int saved_errno = errno; |
| 7151 | 799 close (fd); |
|
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
800 __set_errno (saved_errno); |
| 7151 | 801 return NULL; |
| 802 } | |
| 803 close (fd); | |
| 804 } | |
| 5858 | 805 return (sp->fts_child); |
| 806 } | |
| 807 | |
| 808 /* | |
| 809 * This is the tricky part -- do not casually change *anything* in here. The | |
| 810 * idea is to build the linked list of entries that are used by fts_children | |
| 811 * and fts_read. There are lots of special cases. | |
| 812 * | |
| 813 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
| 814 * set and it's a physical walk (so that symbolic links can't be directories), | |
| 815 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
| 816 * of the file is in the directory entry. Otherwise, we assume that the number | |
| 817 * of subdirectories in a node is equal to the number of links to the parent. | |
| 818 * The former skips all stat calls. The latter skips stat calls in any leaf | |
| 819 * directories and for any files after the subdirectories in the directory have | |
| 820 * been found, cutting the stat calls by about 2/3. | |
| 821 */ | |
| 822 static FTSENT * | |
| 823 internal_function | |
| 824 fts_build (register FTS *sp, int type) | |
| 825 { | |
| 826 register struct dirent *dp; | |
| 827 register FTSENT *p, *head; | |
| 828 register size_t nitems; | |
| 829 FTSENT *cur, *tail; | |
| 830 DIR *dirp; | |
| 831 void *oldaddr; | |
| 832 int saved_errno; | |
| 833 bool descend; | |
| 834 bool doadjust; | |
| 835 ptrdiff_t level; | |
| 836 nlink_t nlinks; | |
| 837 bool nostat; | |
| 838 size_t len, maxlen, new_len; | |
| 839 char *cp; | |
| 840 | |
| 841 /* Set current node pointer. */ | |
| 842 cur = sp->fts_cur; | |
| 843 | |
| 844 /* | |
| 845 * Open the directory for reading. If this fails, we're done. | |
| 846 * If being called from fts_read, set the fts_info field. | |
| 847 */ | |
| 848 #if defined FTS_WHITEOUT && 0 | |
| 849 if (ISSET(FTS_WHITEOUT)) | |
| 850 oflag = DTF_NODUP|DTF_REWIND; | |
| 851 else | |
| 852 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
| 853 #else | |
| 7151 | 854 # define __opendir2(file, flag) \ |
| 855 ( ! ISSET(FTS_NOCHDIR) && ISSET(FTS_CWDFD) \ | |
| 856 ? opendirat(sp->fts_cwd_fd, file) \ | |
| 857 : opendir(file)) | |
| 5858 | 858 #endif |
| 859 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
| 860 if (type == BREAD) { | |
| 861 cur->fts_info = FTS_DNR; | |
| 862 cur->fts_errno = errno; | |
| 863 } | |
| 864 return (NULL); | |
| 865 } | |
| 866 | |
| 867 /* | |
| 868 * Nlinks is the number of possible entries of type directory in the | |
| 869 * directory if we're cheating on stat calls, 0 if we're not doing | |
| 870 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
| 871 */ | |
| 872 if (type == BNAMES) { | |
| 873 nlinks = 0; | |
| 874 /* Be quiet about nostat, GCC. */ | |
| 875 nostat = false; | |
| 876 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
| 877 nlinks = (cur->fts_statp->st_nlink | |
| 878 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
| 879 nostat = true; | |
| 880 } else { | |
| 881 nlinks = -1; | |
| 882 nostat = false; | |
| 883 } | |
| 884 | |
| 885 /* | |
| 886 * If we're going to need to stat anything or we want to descend | |
| 887 * and stay in the directory, chdir. If this fails we keep going, | |
| 888 * but set a flag so we don't chdir after the post-order visit. | |
| 889 * We won't be able to stat anything, but we can still return the | |
| 890 * names themselves. Note, that since fts_read won't be able to | |
| 5907 | 891 * chdir into the directory, it will have to return different file |
| 5858 | 892 * names than before, i.e. "a/b" instead of "b". Since the node |
| 893 * has already been visited in pre-order, have to wait until the | |
| 894 * post-order visit to return the error. There is a special case | |
| 895 * here, if there was nothing to stat then it's not an error to | |
| 896 * not be able to stat. This is all fairly nasty. If a program | |
| 897 * needed sorted entries or stat information, they had better be | |
| 898 * checking FTS_NS on the returned nodes. | |
| 899 */ | |
| 900 if (nlinks || type == BREAD) { | |
| 7151 | 901 int dir_fd = dirfd(dirp); |
| 902 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) | |
| 903 dir_fd = dup (dir_fd); | |
| 904 if (dir_fd < 0 || fts_safe_changedir(sp, cur, dir_fd, NULL)) { | |
| 5858 | 905 if (nlinks && type == BREAD) |
| 906 cur->fts_errno = errno; | |
| 907 cur->fts_flags |= FTS_DONTCHDIR; | |
| 908 descend = false; | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
909 closedir(dirp); |
| 7151 | 910 if (ISSET(FTS_CWDFD) && 0 <= dir_fd) |
| 911 close (dir_fd); | |
| 5858 | 912 dirp = NULL; |
| 913 } else | |
| 914 descend = true; | |
| 915 } else | |
| 916 descend = false; | |
| 917 | |
| 918 /* | |
| 919 * Figure out the max file name length that can be stored in the | |
| 5907 | 920 * current buffer -- the inner loop allocates more space as necessary. |
| 5858 | 921 * We really wouldn't have to do the maxlen calculations here, we |
| 5907 | 922 * could do them in fts_read before returning the name, but it's a |
| 5858 | 923 * lot easier here since the length is part of the dirent structure. |
| 924 * | |
| 925 * If not changing directories set a pointer so that can just append | |
| 5907 | 926 * each new component into the file name. |
| 5858 | 927 */ |
| 928 len = NAPPEND(cur); | |
| 929 if (ISSET(FTS_NOCHDIR)) { | |
| 930 cp = sp->fts_path + len; | |
| 931 *cp++ = '/'; | |
| 932 } else { | |
| 933 /* GCC, you're too verbose. */ | |
| 934 cp = NULL; | |
| 935 } | |
| 936 len++; | |
| 937 maxlen = sp->fts_pathlen - len; | |
| 938 | |
| 939 level = cur->fts_level + 1; | |
| 940 | |
| 941 /* Read the directory, attaching each entry to the `link' pointer. */ | |
| 942 doadjust = false; | |
| 943 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
| 944 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) | |
| 945 continue; | |
| 946 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
947 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
|
948 _D_EXACT_NAMLEN (dp))) == NULL) |
| 5858 | 949 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
|
950 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
|
951 /* include space for NUL */ |
| 5858 | 952 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
|
953 if (! fts_palloc(sp, _D_EXACT_NAMLEN (dp) + len + 1)) { |
| 5858 | 954 /* |
| 5907 | 955 * No more memory. Save |
| 5858 | 956 * errno, free up the current structure and the |
| 957 * structures already allocated. | |
| 958 */ | |
| 959 mem1: saved_errno = errno; | |
| 960 if (p) | |
| 961 free(p); | |
| 962 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
963 closedir(dirp); |
| 5858 | 964 cur->fts_info = FTS_ERR; |
| 965 SET(FTS_STOP); | |
| 966 __set_errno (saved_errno); | |
| 967 return (NULL); | |
| 968 } | |
| 969 /* Did realloc() change the pointer? */ | |
| 970 if (oldaddr != sp->fts_path) { | |
| 971 doadjust = true; | |
| 972 if (ISSET(FTS_NOCHDIR)) | |
| 973 cp = sp->fts_path + len; | |
| 974 } | |
| 975 maxlen = sp->fts_pathlen - len; | |
| 976 } | |
| 977 | |
|
6949
96af1224c6fa
* backupfile.c, dirfd.h, fts.c, getcwd.c, glob.c, glob_.h:
Paul Eggert <eggert@cs.ucla.edu>
parents:
6934
diff
changeset
|
978 new_len = len + _D_EXACT_NAMLEN (dp); |
| 5858 | 979 if (new_len < len) { |
| 980 /* | |
| 981 * In the unlikely even that we would end up | |
| 5907 | 982 * with a file name longer than SIZE_MAX, free up |
| 5858 | 983 * the current structure and the structures already |
| 984 * allocated, then error out with ENAMETOOLONG. | |
| 985 */ | |
| 986 free(p); | |
| 987 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
988 closedir(dirp); |
| 5858 | 989 cur->fts_info = FTS_ERR; |
| 990 SET(FTS_STOP); | |
| 991 __set_errno (ENAMETOOLONG); | |
| 992 return (NULL); | |
| 993 } | |
| 994 p->fts_level = level; | |
| 995 p->fts_parent = sp->fts_cur; | |
| 996 p->fts_pathlen = new_len; | |
| 997 | |
| 998 #if defined FTS_WHITEOUT && 0 | |
| 999 if (dp->d_type == DT_WHT) | |
| 1000 p->fts_flags |= FTS_ISW; | |
| 1001 #endif | |
| 1002 | |
| 7151 | 1003 /* Build a file name for fts_stat to stat. */ |
| 1004 if (ISSET(FTS_NOCHDIR)) { | |
| 1005 p->fts_accpath = p->fts_path; | |
| 1006 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
| 1007 } else | |
| 1008 p->fts_accpath = p->fts_name; | |
| 1009 /* Stat it. */ | |
| 1010 p->fts_info = fts_stat(sp, p, false); | |
| 5858 | 1011 |
| 7151 | 1012 /* Decrement link count if applicable. */ |
| 1013 if (nlinks > 0 && (p->fts_info == FTS_D || | |
| 1014 p->fts_info == FTS_DC || p->fts_info == FTS_DOT)) | |
| 1015 nlinks -= nostat; | |
| 5858 | 1016 |
| 1017 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
| 1018 p->fts_link = NULL; | |
| 1019 if (head == NULL) | |
| 1020 head = tail = p; | |
| 1021 else { | |
| 1022 tail->fts_link = p; | |
| 1023 tail = p; | |
| 1024 } | |
| 1025 ++nitems; | |
| 1026 } | |
| 1027 if (dirp) | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
1028 closedir(dirp); |
| 5858 | 1029 |
| 1030 /* | |
| 5907 | 1031 * If realloc() changed the address of the file name, adjust the |
| 5858 | 1032 * addresses for the rest of the tree and the dir list. |
| 1033 */ | |
| 1034 if (doadjust) | |
| 1035 fts_padjust(sp, head); | |
| 1036 | |
| 1037 /* | |
| 5907 | 1038 * If not changing directories, reset the file name back to original |
| 5858 | 1039 * state. |
| 1040 */ | |
| 1041 if (ISSET(FTS_NOCHDIR)) { | |
| 1042 if (len == sp->fts_pathlen || nitems == 0) | |
| 1043 --cp; | |
| 1044 *cp = '\0'; | |
| 1045 } | |
| 1046 | |
| 1047 /* | |
| 1048 * If descended after called from fts_children or after called from | |
| 1049 * fts_read and nothing found, get back. At the root level we use | |
| 5907 | 1050 * the saved fd; if one of fts_open()'s arguments is a relative name |
| 5858 | 1051 * to an empty directory, we wind up here with no other way back. If |
| 1052 * can't get back, we're done. | |
| 1053 */ | |
| 1054 if (descend && (type == BCHILD || !nitems) && | |
| 7151 | 1055 (cur->fts_level == FTS_ROOTLEVEL |
| 1056 ? RESTORE_INITIAL_CWD(sp) | |
| 1057 : fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
| 5858 | 1058 cur->fts_info = FTS_ERR; |
| 1059 SET(FTS_STOP); | |
| 7151 | 1060 fts_lfree(head); |
| 5858 | 1061 return (NULL); |
| 1062 } | |
| 1063 | |
| 1064 /* If didn't find anything, return NULL. */ | |
| 1065 if (!nitems) { | |
| 1066 if (type == BREAD) | |
| 1067 cur->fts_info = FTS_DP; | |
| 7151 | 1068 fts_lfree(head); |
| 5858 | 1069 return (NULL); |
| 1070 } | |
| 1071 | |
| 1072 /* Sort the entries. */ | |
| 1073 if (sp->fts_compar && nitems > 1) | |
| 1074 head = fts_sort(sp, head, nitems); | |
| 1075 return (head); | |
| 1076 } | |
| 1077 | |
| 1078 #if FTS_DEBUG | |
| 1079 | |
| 1080 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
| 1081 current hierarchy. There should be a directory with dev/inode | |
| 1082 matching those of AD. If not, print a lot of diagnostics. */ | |
| 1083 static void | |
| 1084 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
| 1085 { | |
| 1086 FTSENT const *ent; | |
| 1087 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1088 { | |
| 1089 if (ad->ino == ent->fts_statp->st_ino | |
| 1090 && ad->dev == ent->fts_statp->st_dev) | |
| 1091 return; | |
| 1092 } | |
| 1093 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
| 1094 printf ("active dirs:\n"); | |
| 1095 for (ent = e_curr; | |
| 1096 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1097 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
| 1098 ad->fts_ent->fts_accpath, | |
| 1099 (uintmax_t) ad->dev, | |
| 1100 (uintmax_t) ad->ino, | |
| 1101 ent->fts_accpath, | |
| 1102 (uintmax_t) ent->fts_statp->st_dev, | |
| 1103 (uintmax_t) ent->fts_statp->st_ino); | |
| 1104 } | |
| 1105 | |
| 1106 void | |
| 1107 fts_cross_check (FTS const *sp) | |
| 1108 { | |
| 1109 FTSENT const *ent = sp->fts_cur; | |
| 1110 FTSENT const *t; | |
| 1111 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
| 1112 return; | |
| 1113 | |
| 1114 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
| 1115 /* Make sure every parent dir is in the tree. */ | |
| 1116 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1117 { | |
| 1118 struct Active_dir ad; | |
| 1119 ad.ino = t->fts_statp->st_ino; | |
| 1120 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
|
1121 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
| 5858 | 1122 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
| 1123 } | |
| 1124 | |
| 1125 /* Make sure every dir in the tree is an active dir. | |
| 1126 But ENT is not necessarily a directory. If so, just skip this part. */ | |
| 1127 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
| 1128 && (ent->fts_info == FTS_DP | |
| 1129 || ent->fts_info == FTS_D)) | |
| 1130 { | |
| 1131 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
|
1132 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
|
1133 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
| 5858 | 1134 { |
| 1135 find_matching_ancestor (ent, ad); | |
| 1136 } | |
| 1137 } | |
| 1138 } | |
| 1139 #endif | |
| 1140 | |
| 1141 static unsigned short int | |
| 1142 internal_function | |
| 1143 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
| 1144 { | |
| 1145 struct stat *sbp = p->fts_statp; | |
| 1146 int saved_errno; | |
| 1147 | |
| 1148 #if defined FTS_WHITEOUT && 0 | |
| 1149 /* check for whiteout */ | |
| 1150 if (p->fts_flags & FTS_ISW) { | |
| 1151 memset(sbp, '\0', sizeof (*sbp)); | |
| 1152 sbp->st_mode = S_IFWHT; | |
| 1153 return (FTS_W); | |
| 1154 } | |
| 1155 #endif | |
| 1156 | |
| 1157 /* | |
| 1158 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
| 1159 * a stat(2). If that fails, check for a non-existent symlink. If | |
| 1160 * fail, set the errno from the stat call. | |
| 1161 */ | |
| 1162 if (ISSET(FTS_LOGICAL) || follow) { | |
| 1163 if (stat(p->fts_accpath, sbp)) { | |
| 1164 saved_errno = errno; | |
|
6611
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1165 if (errno == ENOENT |
|
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1166 && lstat(p->fts_accpath, sbp) == 0) { |
| 5858 | 1167 __set_errno (0); |
| 1168 return (FTS_SLNONE); | |
| 1169 } | |
| 1170 p->fts_errno = saved_errno; | |
| 1171 goto err; | |
| 1172 } | |
| 7151 | 1173 } else if (fstatat(sp->fts_cwd_fd, p->fts_accpath, sbp, |
| 1174 AT_SYMLINK_NOFOLLOW)) { | |
| 5858 | 1175 p->fts_errno = errno; |
| 1176 err: memset(sbp, 0, sizeof(struct stat)); | |
| 1177 return (FTS_NS); | |
| 1178 } | |
| 1179 | |
| 1180 if (S_ISDIR(sbp->st_mode)) { | |
| 1181 if (ISDOT(p->fts_name)) | |
| 1182 return (FTS_DOT); | |
| 5872 | 1183 |
| 1184 #if _LGPL_PACKAGE | |
| 1185 { | |
| 1186 /* | |
| 1187 * Cycle detection is done by brute force when the directory | |
| 1188 * is first encountered. If the tree gets deep enough or the | |
| 1189 * number of symbolic links to directories is high enough, | |
| 1190 * something faster might be worthwhile. | |
| 1191 */ | |
| 1192 FTSENT *t; | |
| 1193 | |
| 1194 for (t = p->fts_parent; | |
| 1195 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1196 if (sbp->st_ino == t->fts_statp->st_ino | |
| 1197 && sbp->st_dev == t->fts_statp->st_dev) | |
| 1198 { | |
| 1199 p->fts_cycle = t; | |
| 1200 return (FTS_DC); | |
| 1201 } | |
| 1202 } | |
| 1203 #endif | |
| 1204 | |
| 5858 | 1205 return (FTS_D); |
| 1206 } | |
| 1207 if (S_ISLNK(sbp->st_mode)) | |
| 1208 return (FTS_SL); | |
| 1209 if (S_ISREG(sbp->st_mode)) | |
| 1210 return (FTS_F); | |
| 1211 return (FTS_DEFAULT); | |
| 1212 } | |
| 1213 | |
| 1214 static int | |
| 1215 fts_compar (void const *a, void const *b) | |
| 1216 { | |
| 1217 /* Convert A and B to the correct types, to pacify the compiler, and | |
| 1218 for portability to bizarre hosts where "void const *" and "FTSENT | |
| 1219 const **" differ in runtime representation. The comparison | |
| 1220 function cannot modify *a and *b, but there is no compile-time | |
| 1221 check for this. */ | |
| 1222 FTSENT const **pa = (FTSENT const **) a; | |
| 1223 FTSENT const **pb = (FTSENT const **) b; | |
| 1224 return pa[0]->fts_fts->fts_compar (pa, pb); | |
| 1225 } | |
| 1226 | |
| 1227 static FTSENT * | |
| 1228 internal_function | |
| 1229 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
| 1230 { | |
| 1231 register FTSENT **ap, *p; | |
| 1232 | |
| 1233 /* On most modern hosts, void * and FTSENT ** have the same | |
| 1234 run-time representation, and one can convert sp->fts_compar to | |
| 1235 the type qsort expects without problem. Use the heuristic that | |
| 1236 this is OK if the two pointer types are the same size, and if | |
| 1237 converting FTSENT ** to long int is the same as converting | |
| 1238 FTSENT ** to void * and then to long int. This heuristic isn't | |
| 1239 valid in general but we don't know of any counterexamples. */ | |
| 1240 FTSENT *dummy; | |
| 1241 int (*compare) (void const *, void const *) = | |
| 1242 ((sizeof &dummy == sizeof (void *) | |
| 1243 && (long int) &dummy == (long int) (void *) &dummy) | |
| 1244 ? (int (*) (void const *, void const *)) sp->fts_compar | |
| 1245 : fts_compar); | |
| 1246 | |
| 1247 /* | |
| 1248 * Construct an array of pointers to the structures and call qsort(3). | |
| 1249 * Reassemble the array in the order returned by qsort. If unable to | |
| 1250 * sort for memory reasons, return the directory entries in their | |
| 1251 * current order. Allocate enough space for the current needs plus | |
| 1252 * 40 so don't realloc one entry at a time. | |
| 1253 */ | |
| 1254 if (nitems > sp->fts_nitems) { | |
| 1255 struct _ftsent **a; | |
| 1256 | |
| 1257 sp->fts_nitems = nitems + 40; | |
| 1258 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
| 1259 || ! (a = realloc (sp->fts_array, | |
| 1260 sp->fts_nitems * sizeof *a))) { | |
| 1261 free(sp->fts_array); | |
| 1262 sp->fts_array = NULL; | |
| 1263 sp->fts_nitems = 0; | |
| 1264 return (head); | |
| 1265 } | |
| 1266 sp->fts_array = a; | |
| 1267 } | |
| 1268 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
| 1269 *ap++ = p; | |
| 1270 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
| 1271 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
| 1272 ap[0]->fts_link = ap[1]; | |
| 1273 ap[0]->fts_link = NULL; | |
| 1274 return (head); | |
| 1275 } | |
| 1276 | |
| 1277 static FTSENT * | |
| 1278 internal_function | |
| 1279 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
| 1280 { | |
| 1281 register FTSENT *p; | |
| 1282 size_t len; | |
| 1283 | |
| 1284 /* | |
| 1285 * The file name is a variable length array. Allocate the FTSENT | |
| 1286 * structure and the file name in one chunk. | |
| 1287 */ | |
| 1288 len = sizeof(FTSENT) + namelen; | |
| 1289 if ((p = malloc(len)) == NULL) | |
| 1290 return (NULL); | |
| 1291 | |
| 1292 /* Copy the name and guarantee NUL termination. */ | |
| 1293 memmove(p->fts_name, name, namelen); | |
| 1294 p->fts_name[namelen] = '\0'; | |
| 1295 | |
| 1296 p->fts_namelen = namelen; | |
| 1297 p->fts_fts = sp; | |
| 1298 p->fts_path = sp->fts_path; | |
| 1299 p->fts_errno = 0; | |
| 1300 p->fts_flags = 0; | |
| 1301 p->fts_instr = FTS_NOINSTR; | |
| 1302 p->fts_number = 0; | |
| 1303 p->fts_pointer = NULL; | |
| 1304 return (p); | |
| 1305 } | |
| 1306 | |
| 1307 static void | |
| 1308 internal_function | |
| 1309 fts_lfree (register FTSENT *head) | |
| 1310 { | |
| 1311 register FTSENT *p; | |
| 1312 | |
| 1313 /* Free a linked list of structures. */ | |
| 1314 while ((p = head)) { | |
| 1315 head = head->fts_link; | |
| 1316 free(p); | |
| 1317 } | |
| 1318 } | |
| 1319 | |
| 1320 /* | |
| 5907 | 1321 * Allow essentially unlimited file name lengths; find, rm, ls should |
| 1322 * all work on any tree. Most systems will allow creation of file | |
| 1323 * names much longer than MAXPATHLEN, even though the kernel won't | |
| 1324 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
| 1325 * so don't realloc the file name 2 bytes at a time. | |
| 5858 | 1326 */ |
| 1327 static bool | |
| 1328 internal_function | |
| 1329 fts_palloc (FTS *sp, size_t more) | |
| 1330 { | |
| 1331 char *p; | |
| 1332 size_t new_len = sp->fts_pathlen + more + 256; | |
| 1333 | |
| 1334 /* | |
| 1335 * See if fts_pathlen would overflow. | |
| 1336 */ | |
| 1337 if (new_len < sp->fts_pathlen) { | |
| 1338 if (sp->fts_path) { | |
| 1339 free(sp->fts_path); | |
| 1340 sp->fts_path = NULL; | |
| 1341 } | |
| 1342 sp->fts_path = NULL; | |
| 1343 __set_errno (ENAMETOOLONG); | |
| 1344 return false; | |
| 1345 } | |
| 1346 sp->fts_pathlen = new_len; | |
| 1347 p = realloc(sp->fts_path, sp->fts_pathlen); | |
| 1348 if (p == NULL) { | |
| 1349 free(sp->fts_path); | |
| 1350 sp->fts_path = NULL; | |
| 1351 return false; | |
| 1352 } | |
| 1353 sp->fts_path = p; | |
| 1354 return true; | |
| 1355 } | |
| 1356 | |
| 1357 /* | |
| 5907 | 1358 * When the file name is realloc'd, have to fix all of the pointers in |
| 1359 * structures already returned. | |
| 5858 | 1360 */ |
| 1361 static void | |
| 1362 internal_function | |
| 1363 fts_padjust (FTS *sp, FTSENT *head) | |
| 1364 { | |
| 1365 FTSENT *p; | |
| 1366 char *addr = sp->fts_path; | |
| 1367 | |
| 1368 #define ADJUST(p) do { \ | |
| 1369 if ((p)->fts_accpath != (p)->fts_name) { \ | |
| 1370 (p)->fts_accpath = \ | |
| 1371 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
| 1372 } \ | |
| 1373 (p)->fts_path = addr; \ | |
| 1374 } while (0) | |
| 1375 /* Adjust the current set of children. */ | |
| 1376 for (p = sp->fts_child; p; p = p->fts_link) | |
| 1377 ADJUST(p); | |
| 1378 | |
| 1379 /* Adjust the rest of the tree, including the current level. */ | |
| 1380 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 1381 ADJUST(p); | |
| 1382 p = p->fts_link ? p->fts_link : p->fts_parent; | |
| 1383 } | |
| 1384 } | |
| 1385 | |
| 1386 static size_t | |
| 1387 internal_function | |
| 1388 fts_maxarglen (char * const *argv) | |
| 1389 { | |
| 1390 size_t len, max; | |
| 1391 | |
| 1392 for (max = 0; *argv; ++argv) | |
| 1393 if ((len = strlen(*argv)) > max) | |
| 1394 max = len; | |
| 1395 return (max + 1); | |
| 1396 } | |
| 1397 | |
| 1398 /* | |
| 5907 | 1399 * Change to dir specified by fd or file name without getting |
| 5858 | 1400 * tricked by someone changing the world out from underneath us. |
| 1401 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
| 7151 | 1402 * If FD is non-negative, expect it to be used after this function returns, |
| 1403 * and to be closed eventually. So don't pass e.g., `dirfd(dirp)' and then | |
| 1404 * do closedir(dirp), because that would invalidate the saved FD. | |
| 1405 * Upon failure, close FD immediately and return nonzero. | |
| 5858 | 1406 */ |
| 1407 static int | |
| 1408 internal_function | |
| 5907 | 1409 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
| 5858 | 1410 { |
| 7151 | 1411 int ret; |
| 1412 | |
| 1413 int newfd = fd; | |
| 1414 if (ISSET(FTS_NOCHDIR)) { | |
| 1415 if (ISSET(FTS_CWDFD) && 0 <= fd) | |
| 1416 close (fd); | |
| 1417 return (0); | |
| 1418 } | |
| 1419 if (fd < 0 && (newfd = diropen (sp, dir)) < 0) | |
| 1420 return (-1); | |
| 5858 | 1421 |
| 7151 | 1422 /* The following dev/inode check is necessary if we're doing |
| 1423 a `logical' traversal (through symlinks, a la chown -L), | |
| 1424 if the system lacks O_NOFOLLOW support, or if we're changing | |
| 1425 to "..". In the latter case, O_NOFOLLOW can't help. In | |
| 1426 general (when the target is not ".."), diropen's use of | |
| 1427 O_NOFOLLOW ensures we don't mistakenly follow a symlink, | |
| 1428 so we can avoid the expense of this fstat. */ | |
| 1429 if (ISSET(FTS_LOGICAL) || O_NOFOLLOW == 0 | |
| 1430 || (dir && STREQ (dir, ".."))) | |
| 1431 { | |
| 1432 struct stat sb; | |
| 1433 if (fstat(newfd, &sb)) | |
| 1434 { | |
| 5858 | 1435 ret = -1; |
| 1436 goto bail; | |
| 7151 | 1437 } |
| 1438 if (p->fts_statp->st_dev != sb.st_dev | |
| 1439 || p->fts_statp->st_ino != sb.st_ino) | |
| 1440 { | |
| 5858 | 1441 __set_errno (ENOENT); /* disinformation */ |
| 1442 ret = -1; | |
| 1443 goto bail; | |
| 7151 | 1444 } |
| 1445 } | |
| 1446 | |
| 1447 if (ISSET(FTS_CWDFD)) | |
| 1448 { | |
| 1449 cwd_advance_fd (sp, newfd); | |
| 1450 return 0; | |
| 1451 } | |
| 1452 | |
| 5858 | 1453 ret = fchdir(newfd); |
| 1454 bail: | |
| 1455 if (fd < 0) | |
| 7151 | 1456 { |
| 1457 int oerrno = errno; | |
| 1458 (void)close(newfd); | |
| 1459 __set_errno (oerrno); | |
| 1460 } | |
| 5858 | 1461 return (ret); |
| 1462 } |