Mercurial > hg > octave-nkf > gnulib-hg
annotate lib/fts.c @ 6912:314715e0260d
Merge from coreutils.
| author | Paul Eggert <eggert@cs.ucla.edu> |
|---|---|
| date | Mon, 03 Jul 2006 08:32:46 +0000 |
| parents | 6f335711be5e |
| children | d68ff786c180 |
| rev | line source |
|---|---|
| 5858 | 1 /* Traverse a file hierarchy. |
| 2 | |
| 6527 | 3 Copyright (C) 2004, 2005, 2006 Free Software Foundation, Inc. |
| 5858 | 4 |
| 5 This program is free software; you can redistribute it and/or modify | |
| 6 it under the terms of the GNU General Public License as published by | |
| 7 the Free Software Foundation; either version 2, or (at your option) | |
| 8 any later version. | |
| 9 | |
| 10 This program is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| 13 GNU General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU General Public License | |
| 16 along with this program; if not, write to the Free Software Foundation, | |
| 17 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ | |
| 18 | |
| 19 /*- | |
| 20 * Copyright (c) 1990, 1993, 1994 | |
| 21 * The Regents of the University of California. All rights reserved. | |
| 22 * | |
| 23 * Redistribution and use in source and binary forms, with or without | |
| 24 * modification, are permitted provided that the following conditions | |
| 25 * are met: | |
| 26 * 1. Redistributions of source code must retain the above copyright | |
| 27 * notice, this list of conditions and the following disclaimer. | |
| 28 * 2. Redistributions in binary form must reproduce the above copyright | |
| 29 * notice, this list of conditions and the following disclaimer in the | |
| 30 * documentation and/or other materials provided with the distribution. | |
| 31 * 4. Neither the name of the University nor the names of its contributors | |
| 32 * may be used to endorse or promote products derived from this software | |
| 33 * without specific prior written permission. | |
| 34 * | |
| 35 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND | |
| 36 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |
| 37 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |
| 38 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE | |
| 39 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |
| 40 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |
| 41 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |
| 42 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |
| 43 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |
| 44 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |
| 45 * SUCH DAMAGE. | |
| 46 */ | |
| 47 | |
| 48 #ifdef HAVE_CONFIG_H | |
| 49 # include <config.h> | |
| 50 #endif | |
| 51 | |
| 52 #if defined(LIBC_SCCS) && !defined(lint) | |
| 53 static char sccsid[] = "@(#)fts.c 8.6 (Berkeley) 8/14/94"; | |
| 54 #endif /* LIBC_SCCS and not lint */ | |
| 55 | |
|
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* fts.c: Include fts_.h first, to check interface.
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56 #include "fts_.h" |
|
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57 |
| 5858 | 58 #if HAVE_SYS_PARAM_H || defined _LIBC |
| 59 # include <sys/param.h> | |
| 60 #endif | |
| 61 #ifdef _LIBC | |
| 62 # include <include/sys/stat.h> | |
| 63 #else | |
| 64 # include <sys/stat.h> | |
| 65 #endif | |
| 66 #include <fcntl.h> | |
| 67 #include <errno.h> | |
| 68 #include "dirfd.h" | |
|
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* 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 | |
|
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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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75 # include "lstat.h" |
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76 #endif |
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77 |
| 5858 | 78 #if defined _LIBC |
| 79 # include <dirent.h> | |
| 80 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent) | |
| 81 #else | |
| 82 # if HAVE_DIRENT_H | |
| 83 # include <dirent.h> | |
| 84 # define NAMLEN(dirent) strlen ((dirent)->d_name) | |
| 85 # else | |
| 86 # define dirent direct | |
| 87 # define NAMLEN(dirent) (dirent)->d_namlen | |
| 88 # if HAVE_SYS_NDIR_H | |
| 89 # include <sys/ndir.h> | |
| 90 # endif | |
| 91 # if HAVE_SYS_DIR_H | |
| 92 # include <sys/dir.h> | |
| 93 # endif | |
| 94 # if HAVE_NDIR_H | |
| 95 # include <ndir.h> | |
| 96 # endif | |
| 97 # endif | |
| 98 #endif | |
| 99 | |
| 100 #ifdef _LIBC | |
| 101 # undef close | |
| 102 # define close __close | |
| 103 # undef closedir | |
| 104 # define closedir __closedir | |
| 105 # undef fchdir | |
| 106 # define fchdir __fchdir | |
| 107 # undef open | |
| 108 # define open __open | |
| 109 # undef opendir | |
| 110 # define opendir __opendir | |
| 111 # undef readdir | |
| 112 # define readdir __readdir | |
| 113 #else | |
| 114 # undef internal_function | |
| 115 # define internal_function /* empty */ | |
| 116 #endif | |
| 117 | |
| 118 #ifndef __set_errno | |
| 119 # define __set_errno(Val) errno = (Val) | |
| 120 #endif | |
| 121 | |
| 122 #ifndef __attribute__ | |
| 123 # if __GNUC__ < 2 || (__GNUC__ == 2 && __GNUC_MINOR__ < 8) || __STRICT_ANSI__ | |
| 124 # define __attribute__(x) /* empty */ | |
| 125 # endif | |
| 126 #endif | |
| 127 | |
| 128 #ifndef ATTRIBUTE_UNUSED | |
| 129 # define ATTRIBUTE_UNUSED __attribute__ ((__unused__)) | |
| 130 #endif | |
| 131 | |
| 132 | |
| 133 static FTSENT *fts_alloc (FTS *, const char *, size_t) internal_function; | |
| 134 static FTSENT *fts_build (FTS *, int) internal_function; | |
| 135 static void fts_lfree (FTSENT *) internal_function; | |
| 136 static void fts_load (FTS *, FTSENT *) internal_function; | |
| 137 static size_t fts_maxarglen (char * const *) internal_function; | |
| 138 static void fts_padjust (FTS *, FTSENT *) internal_function; | |
| 139 static bool fts_palloc (FTS *, size_t) internal_function; | |
| 140 static FTSENT *fts_sort (FTS *, FTSENT *, size_t) internal_function; | |
| 141 static unsigned short int fts_stat (FTS *, FTSENT *, bool) internal_function; | |
| 142 static int fts_safe_changedir (FTS *, FTSENT *, int, const char *) | |
| 143 internal_function; | |
| 144 | |
| 5872 | 145 #if _LGPL_PACKAGE |
| 146 static bool enter_dir (FTS *fts, FTSENT *ent) { return true; } | |
| 147 static void leave_dir (FTS *fts, FTSENT *ent) {} | |
| 148 static bool setup_dir (FTS *fts) { return true; } | |
| 149 static void free_dir (FTS *fts) {} | |
| 150 #else | |
|
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151 # include "fcntl--.h" |
| 5872 | 152 # include "fts-cycle.c" |
| 153 #endif | |
| 154 | |
| 5858 | 155 #ifndef MAX |
| 156 # define MAX(a,b) ((a) > (b) ? (a) : (b)) | |
| 157 #endif | |
| 158 | |
| 159 #ifndef SIZE_MAX | |
| 160 # define SIZE_MAX ((size_t) -1) | |
| 161 #endif | |
| 162 | |
| 163 #ifndef O_DIRECTORY | |
| 164 # define O_DIRECTORY 0 | |
| 165 #endif | |
| 166 | |
| 167 #define ISDOT(a) (a[0] == '.' && (!a[1] || (a[1] == '.' && !a[2]))) | |
| 168 | |
| 169 #define CLR(opt) (sp->fts_options &= ~(opt)) | |
| 170 #define ISSET(opt) (sp->fts_options & (opt)) | |
| 171 #define SET(opt) (sp->fts_options |= (opt)) | |
| 172 | |
| 173 #define FCHDIR(sp, fd) (!ISSET(FTS_NOCHDIR) && fchdir(fd)) | |
| 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 |
| 198 /* Open the directory DIR if possible, and return a file | |
| 199 descriptor. Return -1 and set errno on failure. It doesn't matter | |
| 200 whether the file descriptor has read or write access. */ | |
| 201 | |
| 202 static int | |
| 203 internal_function | |
| 204 diropen (char const *dir) | |
| 205 { | |
|
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206 return open (dir, O_RDONLY | O_DIRECTORY | O_NOCTTY | O_NONBLOCK); |
| 5858 | 207 } |
| 208 | |
| 209 FTS * | |
| 210 fts_open (char * const *argv, | |
| 211 register int options, | |
| 212 int (*compar) (FTSENT const **, FTSENT const **)) | |
| 213 { | |
| 214 register FTS *sp; | |
| 215 register FTSENT *p, *root; | |
| 216 register size_t nitems; | |
| 217 FTSENT *parent, *tmp = NULL; /* pacify gcc */ | |
| 218 size_t len; | |
| 219 | |
| 220 /* Options check. */ | |
| 221 if (options & ~FTS_OPTIONMASK) { | |
| 222 __set_errno (EINVAL); | |
| 223 return (NULL); | |
| 224 } | |
| 225 | |
| 226 /* Allocate/initialize the stream */ | |
| 227 if ((sp = malloc(sizeof(FTS))) == NULL) | |
| 228 return (NULL); | |
| 229 memset(sp, 0, sizeof(FTS)); | |
| 230 sp->fts_compar = compar; | |
| 231 sp->fts_options = options; | |
| 232 | |
| 233 /* Logical walks turn on NOCHDIR; symbolic links are too hard. */ | |
| 234 if (ISSET(FTS_LOGICAL)) | |
| 235 SET(FTS_NOCHDIR); | |
| 236 | |
| 237 /* | |
| 5907 | 238 * Start out with 1K of file name space, and enough, in any case, |
| 239 * to hold the user's file names. | |
| 5858 | 240 */ |
| 241 #ifndef MAXPATHLEN | |
| 242 # define MAXPATHLEN 1024 | |
| 243 #endif | |
|
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244 { |
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245 size_t maxarglen = fts_maxarglen(argv); |
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246 if (! fts_palloc(sp, MAX(maxarglen, MAXPATHLEN))) |
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247 goto mem1; |
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248 } |
| 5858 | 249 |
| 250 /* Allocate/initialize root's parent. */ | |
| 251 if ((parent = fts_alloc(sp, "", 0)) == NULL) | |
| 252 goto mem2; | |
| 253 parent->fts_level = FTS_ROOTPARENTLEVEL; | |
| 254 | |
| 255 /* Allocate/initialize root(s). */ | |
| 256 for (root = NULL, nitems = 0; *argv != NULL; ++argv, ++nitems) { | |
| 5907 | 257 /* Don't allow zero-length file names. */ |
| 5858 | 258 if ((len = strlen(*argv)) == 0) { |
| 259 __set_errno (ENOENT); | |
| 260 goto mem3; | |
| 261 } | |
| 262 | |
| 263 if ((p = fts_alloc(sp, *argv, len)) == NULL) | |
| 264 goto mem3; | |
| 265 p->fts_level = FTS_ROOTLEVEL; | |
| 266 p->fts_parent = parent; | |
| 267 p->fts_accpath = p->fts_name; | |
| 268 p->fts_info = fts_stat(sp, p, ISSET(FTS_COMFOLLOW) != 0); | |
| 269 | |
| 270 /* Command-line "." and ".." are real directories. */ | |
| 271 if (p->fts_info == FTS_DOT) | |
| 272 p->fts_info = FTS_D; | |
| 273 | |
| 274 /* | |
| 275 * If comparison routine supplied, traverse in sorted | |
| 276 * order; otherwise traverse in the order specified. | |
| 277 */ | |
| 278 if (compar) { | |
| 279 p->fts_link = root; | |
| 280 root = p; | |
| 281 } else { | |
| 282 p->fts_link = NULL; | |
| 283 if (root == NULL) | |
| 284 tmp = root = p; | |
| 285 else { | |
| 286 tmp->fts_link = p; | |
| 287 tmp = p; | |
| 288 } | |
| 289 } | |
| 290 } | |
| 291 if (compar && nitems > 1) | |
| 292 root = fts_sort(sp, root, nitems); | |
| 293 | |
| 294 /* | |
| 295 * Allocate a dummy pointer and make fts_read think that we've just | |
| 296 * finished the node before the root(s); set p->fts_info to FTS_INIT | |
| 297 * so that everything about the "current" node is ignored. | |
| 298 */ | |
| 299 if ((sp->fts_cur = fts_alloc(sp, "", 0)) == NULL) | |
| 300 goto mem3; | |
| 301 sp->fts_cur->fts_link = root; | |
| 302 sp->fts_cur->fts_info = FTS_INIT; | |
| 5872 | 303 if (! setup_dir (sp)) |
| 304 goto mem3; | |
| 5858 | 305 |
| 306 /* | |
| 307 * If using chdir(2), grab a file descriptor pointing to dot to ensure | |
| 5907 | 308 * that we can get back here; this could be avoided for some file names, |
| 5858 | 309 * but almost certainly not worth the effort. Slashes, symbolic links, |
| 310 * and ".." are all fairly nasty problems. Note, if we can't get the | |
| 311 * descriptor we run anyway, just more slowly. | |
| 312 */ | |
| 313 if (!ISSET(FTS_NOCHDIR) | |
| 314 && (sp->fts_rfd = diropen (".")) < 0) | |
| 315 SET(FTS_NOCHDIR); | |
| 316 | |
| 317 return (sp); | |
| 318 | |
| 319 mem3: fts_lfree(root); | |
| 320 free(parent); | |
| 321 mem2: free(sp->fts_path); | |
| 322 mem1: free(sp); | |
| 323 return (NULL); | |
| 324 } | |
| 325 | |
| 326 static void | |
| 327 internal_function | |
| 328 fts_load (FTS *sp, register FTSENT *p) | |
| 329 { | |
| 330 register size_t len; | |
| 331 register char *cp; | |
| 332 | |
| 333 /* | |
| 334 * Load the stream structure for the next traversal. Since we don't | |
| 335 * actually enter the directory until after the preorder visit, set | |
| 336 * the fts_accpath field specially so the chdir gets done to the right | |
| 337 * place and the user can access the first node. From fts_open it's | |
| 5907 | 338 * known that the file name will fit. |
| 5858 | 339 */ |
| 340 len = p->fts_pathlen = p->fts_namelen; | |
| 341 memmove(sp->fts_path, p->fts_name, len + 1); | |
| 342 if ((cp = strrchr(p->fts_name, '/')) && (cp != p->fts_name || cp[1])) { | |
| 343 len = strlen(++cp); | |
| 344 memmove(p->fts_name, cp, len + 1); | |
| 345 p->fts_namelen = len; | |
| 346 } | |
| 347 p->fts_accpath = p->fts_path = sp->fts_path; | |
| 348 sp->fts_dev = p->fts_statp->st_dev; | |
| 349 } | |
| 350 | |
| 351 int | |
| 352 fts_close (FTS *sp) | |
| 353 { | |
| 354 register FTSENT *freep, *p; | |
| 355 int saved_errno = 0; | |
| 356 | |
| 357 /* | |
| 358 * This still works if we haven't read anything -- the dummy structure | |
| 359 * points to the root list, so we step through to the end of the root | |
| 360 * list which has a valid parent pointer. | |
| 361 */ | |
| 362 if (sp->fts_cur) { | |
| 363 for (p = sp->fts_cur; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 364 freep = p; | |
| 365 p = p->fts_link != NULL ? p->fts_link : p->fts_parent; | |
| 366 free(freep); | |
| 367 } | |
| 368 free(p); | |
| 369 } | |
| 370 | |
| 5907 | 371 /* Free up child linked list, sort array, file name buffer. */ |
| 5858 | 372 if (sp->fts_child) |
| 373 fts_lfree(sp->fts_child); | |
| 374 if (sp->fts_array) | |
| 375 free(sp->fts_array); | |
| 376 free(sp->fts_path); | |
| 377 | |
| 378 /* Return to original directory, save errno if necessary. */ | |
| 379 if (!ISSET(FTS_NOCHDIR)) { | |
| 380 if (fchdir(sp->fts_rfd)) | |
| 381 saved_errno = errno; | |
| 382 (void)close(sp->fts_rfd); | |
| 383 } | |
| 384 | |
| 5872 | 385 free_dir (sp); |
| 5858 | 386 |
| 387 /* Free up the stream pointer. */ | |
| 388 free(sp); | |
| 389 | |
| 390 /* Set errno and return. */ | |
| 391 if (saved_errno) { | |
| 392 __set_errno (saved_errno); | |
| 393 return (-1); | |
| 394 } | |
| 395 | |
| 396 return (0); | |
| 397 } | |
| 398 | |
| 399 /* | |
| 5907 | 400 * Special case of "/" at the end of the file name so that slashes aren't |
| 401 * appended which would cause file names to be written as "....//foo". | |
| 5858 | 402 */ |
| 403 #define NAPPEND(p) \ | |
| 404 (p->fts_path[p->fts_pathlen - 1] == '/' \ | |
| 405 ? p->fts_pathlen - 1 : p->fts_pathlen) | |
| 406 | |
| 407 FTSENT * | |
| 408 fts_read (register FTS *sp) | |
| 409 { | |
| 410 register FTSENT *p, *tmp; | |
| 411 register unsigned short int instr; | |
| 412 register char *t; | |
| 413 int saved_errno; | |
| 414 | |
| 415 /* If finished or unrecoverable error, return NULL. */ | |
| 416 if (sp->fts_cur == NULL || ISSET(FTS_STOP)) | |
| 417 return (NULL); | |
| 418 | |
| 419 /* Set current node pointer. */ | |
| 420 p = sp->fts_cur; | |
| 421 | |
| 422 /* Save and zero out user instructions. */ | |
| 423 instr = p->fts_instr; | |
| 424 p->fts_instr = FTS_NOINSTR; | |
| 425 | |
| 426 /* Any type of file may be re-visited; re-stat and re-turn. */ | |
| 427 if (instr == FTS_AGAIN) { | |
| 428 p->fts_info = fts_stat(sp, p, false); | |
| 429 return (p); | |
| 430 } | |
| 431 Dprintf (("fts_read: p=%s\n", | |
| 432 p->fts_info == FTS_INIT ? "" : p->fts_path)); | |
| 433 | |
| 434 /* | |
| 435 * Following a symlink -- SLNONE test allows application to see | |
| 436 * SLNONE and recover. If indirecting through a symlink, have | |
| 437 * keep a pointer to current location. If unable to get that | |
| 438 * pointer, follow fails. | |
| 439 */ | |
| 440 if (instr == FTS_FOLLOW && | |
| 441 (p->fts_info == FTS_SL || p->fts_info == FTS_SLNONE)) { | |
| 442 p->fts_info = fts_stat(sp, p, true); | |
| 443 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 444 if ((p->fts_symfd = diropen (".")) < 0) { | |
| 445 p->fts_errno = errno; | |
| 446 p->fts_info = FTS_ERR; | |
| 447 } else | |
| 448 p->fts_flags |= FTS_SYMFOLLOW; | |
| 449 } | |
| 5872 | 450 goto check_for_dir; |
| 5858 | 451 } |
| 452 | |
| 453 /* Directory in pre-order. */ | |
| 454 if (p->fts_info == FTS_D) { | |
| 455 /* If skipped or crossed mount point, do post-order visit. */ | |
| 456 if (instr == FTS_SKIP || | |
| 457 (ISSET(FTS_XDEV) && p->fts_statp->st_dev != sp->fts_dev)) { | |
| 458 if (p->fts_flags & FTS_SYMFOLLOW) | |
| 459 (void)close(p->fts_symfd); | |
| 460 if (sp->fts_child) { | |
| 461 fts_lfree(sp->fts_child); | |
| 462 sp->fts_child = NULL; | |
| 463 } | |
| 464 p->fts_info = FTS_DP; | |
| 465 LEAVE_DIR (sp, p, "1"); | |
| 466 return (p); | |
| 467 } | |
| 468 | |
| 469 /* Rebuild if only read the names and now traversing. */ | |
| 470 if (sp->fts_child != NULL && ISSET(FTS_NAMEONLY)) { | |
| 471 CLR(FTS_NAMEONLY); | |
| 472 fts_lfree(sp->fts_child); | |
| 473 sp->fts_child = NULL; | |
| 474 } | |
| 475 | |
| 476 /* | |
| 477 * Cd to the subdirectory. | |
| 478 * | |
| 479 * If have already read and now fail to chdir, whack the list | |
| 480 * to make the names come out right, and set the parent errno | |
| 481 * so the application will eventually get an error condition. | |
| 482 * Set the FTS_DONTCHDIR flag so that when we logically change | |
| 483 * directories back to the parent we don't do a chdir. | |
| 484 * | |
| 485 * If haven't read do so. If the read fails, fts_build sets | |
| 486 * FTS_STOP or the fts_info field of the node. | |
| 487 */ | |
| 488 if (sp->fts_child != NULL) { | |
| 489 if (fts_safe_changedir(sp, p, -1, p->fts_accpath)) { | |
| 490 p->fts_errno = errno; | |
| 491 p->fts_flags |= FTS_DONTCHDIR; | |
| 492 for (p = sp->fts_child; p != NULL; | |
| 493 p = p->fts_link) | |
| 494 p->fts_accpath = | |
| 495 p->fts_parent->fts_accpath; | |
| 496 } | |
| 497 } else if ((sp->fts_child = fts_build(sp, BREAD)) == NULL) { | |
| 498 if (ISSET(FTS_STOP)) | |
| 499 return (NULL); | |
| 500 /* If fts_build's call to fts_safe_changedir failed | |
| 501 because it was not able to fchdir into a | |
| 502 subdirectory, tell the caller. */ | |
| 503 if (p->fts_errno) | |
| 504 p->fts_info = FTS_ERR; | |
| 505 /* FIXME: see if this should be in an else block */ | |
| 506 LEAVE_DIR (sp, p, "2"); | |
| 507 return (p); | |
| 508 } | |
| 509 p = sp->fts_child; | |
| 510 sp->fts_child = NULL; | |
| 511 goto name; | |
| 512 } | |
| 513 | |
| 514 /* Move to the next node on this level. */ | |
| 515 next: tmp = p; | |
| 516 if ((p = p->fts_link) != NULL) { | |
| 517 free(tmp); | |
| 518 | |
| 519 /* | |
| 520 * If reached the top, return to the original directory (or | |
| 5907 | 521 * the root of the tree), and load the file names for the next |
| 522 * root. | |
| 5858 | 523 */ |
| 524 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 525 if (FCHDIR(sp, sp->fts_rfd)) { | |
| 526 SET(FTS_STOP); | |
| 6540 | 527 sp->fts_cur = p; |
| 5858 | 528 return (NULL); |
| 529 } | |
| 530 fts_load(sp, p); | |
| 5872 | 531 goto check_for_dir; |
| 5858 | 532 } |
| 533 | |
| 534 /* | |
| 535 * User may have called fts_set on the node. If skipped, | |
| 536 * ignore. If followed, get a file descriptor so we can | |
| 537 * get back if necessary. | |
| 538 */ | |
| 539 if (p->fts_instr == FTS_SKIP) | |
| 540 goto next; | |
| 541 if (p->fts_instr == FTS_FOLLOW) { | |
| 542 p->fts_info = fts_stat(sp, p, true); | |
| 543 if (p->fts_info == FTS_D && !ISSET(FTS_NOCHDIR)) { | |
| 544 if ((p->fts_symfd = diropen (".")) < 0) { | |
| 545 p->fts_errno = errno; | |
| 546 p->fts_info = FTS_ERR; | |
| 547 } else | |
| 548 p->fts_flags |= FTS_SYMFOLLOW; | |
| 549 } | |
| 550 p->fts_instr = FTS_NOINSTR; | |
| 551 } | |
| 552 | |
| 553 name: t = sp->fts_path + NAPPEND(p->fts_parent); | |
| 554 *t++ = '/'; | |
| 555 memmove(t, p->fts_name, p->fts_namelen + 1); | |
| 5872 | 556 check_for_dir: |
| 557 sp->fts_cur = p; | |
| 5858 | 558 if (p->fts_info == FTS_D) |
| 5872 | 559 { |
| 560 Dprintf ((" %s-entering: %s\n", sp, p->fts_path)); | |
| 561 if (! enter_dir (sp, p)) | |
| 562 { | |
| 563 __set_errno (ENOMEM); | |
| 564 return NULL; | |
| 565 } | |
| 566 } | |
| 567 return p; | |
| 5858 | 568 } |
| 569 | |
| 570 /* Move up to the parent node. */ | |
| 571 p = tmp->fts_parent; | |
| 572 free(tmp); | |
| 573 | |
| 574 if (p->fts_level == FTS_ROOTPARENTLEVEL) { | |
| 575 /* | |
| 576 * Done; free everything up and set errno to 0 so the user | |
| 577 * can distinguish between error and EOF. | |
| 578 */ | |
| 579 free(p); | |
| 580 __set_errno (0); | |
| 581 return (sp->fts_cur = NULL); | |
| 582 } | |
| 583 | |
| 5907 | 584 /* NUL terminate the file name. */ |
| 5858 | 585 sp->fts_path[p->fts_pathlen] = '\0'; |
| 586 | |
| 587 /* | |
| 588 * Return to the parent directory. If at a root node or came through | |
| 589 * a symlink, go back through the file descriptor. Otherwise, cd up | |
| 590 * one directory. | |
| 591 */ | |
| 592 if (p->fts_level == FTS_ROOTLEVEL) { | |
| 593 if (FCHDIR(sp, sp->fts_rfd)) { | |
| 594 p->fts_errno = errno; | |
| 595 SET(FTS_STOP); | |
| 596 } | |
| 597 } else if (p->fts_flags & FTS_SYMFOLLOW) { | |
| 598 if (FCHDIR(sp, p->fts_symfd)) { | |
| 599 saved_errno = errno; | |
| 600 (void)close(p->fts_symfd); | |
| 601 __set_errno (saved_errno); | |
| 602 p->fts_errno = errno; | |
| 603 SET(FTS_STOP); | |
| 604 } | |
| 605 (void)close(p->fts_symfd); | |
| 606 } else if (!(p->fts_flags & FTS_DONTCHDIR) && | |
| 607 fts_safe_changedir(sp, p->fts_parent, -1, "..")) { | |
| 608 p->fts_errno = errno; | |
| 609 SET(FTS_STOP); | |
| 610 } | |
| 611 p->fts_info = p->fts_errno ? FTS_ERR : FTS_DP; | |
| 612 if (p->fts_errno == 0) | |
| 613 LEAVE_DIR (sp, p, "3"); | |
| 614 sp->fts_cur = p; | |
| 615 return ISSET(FTS_STOP) ? NULL : p; | |
| 616 } | |
| 617 | |
| 618 /* | |
| 619 * Fts_set takes the stream as an argument although it's not used in this | |
| 620 * implementation; it would be necessary if anyone wanted to add global | |
| 621 * semantics to fts using fts_set. An error return is allowed for similar | |
| 622 * reasons. | |
| 623 */ | |
| 624 /* ARGSUSED */ | |
| 625 int | |
| 626 fts_set(FTS *sp ATTRIBUTE_UNUSED, FTSENT *p, int instr) | |
| 627 { | |
| 628 if (instr != 0 && instr != FTS_AGAIN && instr != FTS_FOLLOW && | |
| 629 instr != FTS_NOINSTR && instr != FTS_SKIP) { | |
| 630 __set_errno (EINVAL); | |
| 631 return (1); | |
| 632 } | |
| 633 p->fts_instr = instr; | |
| 634 return (0); | |
| 635 } | |
| 636 | |
| 637 FTSENT * | |
| 638 fts_children (register FTS *sp, int instr) | |
| 639 { | |
| 640 register FTSENT *p; | |
| 641 int fd; | |
| 642 | |
| 643 if (instr != 0 && instr != FTS_NAMEONLY) { | |
| 644 __set_errno (EINVAL); | |
| 645 return (NULL); | |
| 646 } | |
| 647 | |
| 648 /* Set current node pointer. */ | |
| 649 p = sp->fts_cur; | |
| 650 | |
| 651 /* | |
| 652 * Errno set to 0 so user can distinguish empty directory from | |
| 653 * an error. | |
| 654 */ | |
| 655 __set_errno (0); | |
| 656 | |
| 657 /* Fatal errors stop here. */ | |
| 658 if (ISSET(FTS_STOP)) | |
| 659 return (NULL); | |
| 660 | |
| 661 /* Return logical hierarchy of user's arguments. */ | |
| 662 if (p->fts_info == FTS_INIT) | |
| 663 return (p->fts_link); | |
| 664 | |
| 665 /* | |
| 666 * If not a directory being visited in pre-order, stop here. Could | |
| 667 * allow FTS_DNR, assuming the user has fixed the problem, but the | |
| 668 * same effect is available with FTS_AGAIN. | |
| 669 */ | |
| 670 if (p->fts_info != FTS_D /* && p->fts_info != FTS_DNR */) | |
| 671 return (NULL); | |
| 672 | |
| 673 /* Free up any previous child list. */ | |
| 674 if (sp->fts_child != NULL) | |
| 675 fts_lfree(sp->fts_child); | |
| 676 | |
| 677 if (instr == FTS_NAMEONLY) { | |
| 678 SET(FTS_NAMEONLY); | |
| 679 instr = BNAMES; | |
| 680 } else | |
| 681 instr = BCHILD; | |
| 682 | |
| 683 /* | |
| 5907 | 684 * If using chdir on a relative file name and called BEFORE fts_read |
| 685 * does its chdir to the root of a traversal, we can lose -- we need to | |
| 5858 | 686 * chdir into the subdirectory, and we don't know where the current |
| 687 * directory is, so we can't get back so that the upcoming chdir by | |
| 688 * fts_read will work. | |
| 689 */ | |
| 690 if (p->fts_level != FTS_ROOTLEVEL || p->fts_accpath[0] == '/' || | |
| 691 ISSET(FTS_NOCHDIR)) | |
| 692 return (sp->fts_child = fts_build(sp, instr)); | |
| 693 | |
| 694 if ((fd = diropen (".")) < 0) | |
| 695 return (sp->fts_child = NULL); | |
| 696 sp->fts_child = fts_build(sp, instr); | |
| 697 if (fchdir(fd)) { | |
|
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Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
698 int saved_errno = errno; |
| 5858 | 699 (void)close(fd); |
|
6611
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Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
700 __set_errno (saved_errno); |
| 5858 | 701 return (NULL); |
| 702 } | |
| 703 (void)close(fd); | |
| 704 return (sp->fts_child); | |
| 705 } | |
| 706 | |
| 707 /* | |
| 708 * This is the tricky part -- do not casually change *anything* in here. The | |
| 709 * idea is to build the linked list of entries that are used by fts_children | |
| 710 * and fts_read. There are lots of special cases. | |
| 711 * | |
| 712 * The real slowdown in walking the tree is the stat calls. If FTS_NOSTAT is | |
| 713 * set and it's a physical walk (so that symbolic links can't be directories), | |
| 714 * we can do things quickly. First, if it's a 4.4BSD file system, the type | |
| 715 * of the file is in the directory entry. Otherwise, we assume that the number | |
| 716 * of subdirectories in a node is equal to the number of links to the parent. | |
| 717 * The former skips all stat calls. The latter skips stat calls in any leaf | |
| 718 * directories and for any files after the subdirectories in the directory have | |
| 719 * been found, cutting the stat calls by about 2/3. | |
| 720 */ | |
| 721 static FTSENT * | |
| 722 internal_function | |
| 723 fts_build (register FTS *sp, int type) | |
| 724 { | |
| 725 register struct dirent *dp; | |
| 726 register FTSENT *p, *head; | |
| 727 register size_t nitems; | |
| 728 FTSENT *cur, *tail; | |
| 729 DIR *dirp; | |
| 730 void *oldaddr; | |
| 731 int cderrno; | |
| 732 int saved_errno; | |
| 733 bool descend; | |
| 734 bool doadjust; | |
| 735 ptrdiff_t level; | |
| 736 nlink_t nlinks; | |
| 737 bool nostat; | |
| 738 size_t len, maxlen, new_len; | |
| 739 char *cp; | |
| 740 | |
| 741 /* Set current node pointer. */ | |
| 742 cur = sp->fts_cur; | |
| 743 | |
| 744 /* | |
| 745 * Open the directory for reading. If this fails, we're done. | |
| 746 * If being called from fts_read, set the fts_info field. | |
| 747 */ | |
| 748 #if defined FTS_WHITEOUT && 0 | |
| 749 if (ISSET(FTS_WHITEOUT)) | |
| 750 oflag = DTF_NODUP|DTF_REWIND; | |
| 751 else | |
| 752 oflag = DTF_HIDEW|DTF_NODUP|DTF_REWIND; | |
| 753 #else | |
| 5907 | 754 # define __opendir2(file, flag) opendir(file) |
| 5858 | 755 #endif |
| 756 if ((dirp = __opendir2(cur->fts_accpath, oflag)) == NULL) { | |
| 757 if (type == BREAD) { | |
| 758 cur->fts_info = FTS_DNR; | |
| 759 cur->fts_errno = errno; | |
| 760 } | |
| 761 return (NULL); | |
| 762 } | |
| 763 | |
| 764 /* | |
| 765 * Nlinks is the number of possible entries of type directory in the | |
| 766 * directory if we're cheating on stat calls, 0 if we're not doing | |
| 767 * any stat calls at all, (nlink_t) -1 if we're statting everything. | |
| 768 */ | |
| 769 if (type == BNAMES) { | |
| 770 nlinks = 0; | |
| 771 /* Be quiet about nostat, GCC. */ | |
| 772 nostat = false; | |
| 773 } else if (ISSET(FTS_NOSTAT) && ISSET(FTS_PHYSICAL)) { | |
| 774 nlinks = (cur->fts_statp->st_nlink | |
| 775 - (ISSET(FTS_SEEDOT) ? 0 : 2)); | |
| 776 nostat = true; | |
| 777 } else { | |
| 778 nlinks = -1; | |
| 779 nostat = false; | |
| 780 } | |
| 781 | |
| 782 /* | |
| 783 * If we're going to need to stat anything or we want to descend | |
| 784 * and stay in the directory, chdir. If this fails we keep going, | |
| 785 * but set a flag so we don't chdir after the post-order visit. | |
| 786 * We won't be able to stat anything, but we can still return the | |
| 787 * names themselves. Note, that since fts_read won't be able to | |
| 5907 | 788 * chdir into the directory, it will have to return different file |
| 5858 | 789 * names than before, i.e. "a/b" instead of "b". Since the node |
| 790 * has already been visited in pre-order, have to wait until the | |
| 791 * post-order visit to return the error. There is a special case | |
| 792 * here, if there was nothing to stat then it's not an error to | |
| 793 * not be able to stat. This is all fairly nasty. If a program | |
| 794 * needed sorted entries or stat information, they had better be | |
| 795 * checking FTS_NS on the returned nodes. | |
| 796 */ | |
| 797 cderrno = 0; | |
| 798 if (nlinks || type == BREAD) { | |
| 799 if (fts_safe_changedir(sp, cur, dirfd(dirp), NULL)) { | |
| 800 if (nlinks && type == BREAD) | |
| 801 cur->fts_errno = errno; | |
| 802 cur->fts_flags |= FTS_DONTCHDIR; | |
| 803 descend = false; | |
| 804 cderrno = errno; | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
805 closedir(dirp); |
| 5858 | 806 dirp = NULL; |
| 807 } else | |
| 808 descend = true; | |
| 809 } else | |
| 810 descend = false; | |
| 811 | |
| 812 /* | |
| 813 * Figure out the max file name length that can be stored in the | |
| 5907 | 814 * current buffer -- the inner loop allocates more space as necessary. |
| 5858 | 815 * We really wouldn't have to do the maxlen calculations here, we |
| 5907 | 816 * could do them in fts_read before returning the name, but it's a |
| 5858 | 817 * lot easier here since the length is part of the dirent structure. |
| 818 * | |
| 819 * If not changing directories set a pointer so that can just append | |
| 5907 | 820 * each new component into the file name. |
| 5858 | 821 */ |
| 822 len = NAPPEND(cur); | |
| 823 if (ISSET(FTS_NOCHDIR)) { | |
| 824 cp = sp->fts_path + len; | |
| 825 *cp++ = '/'; | |
| 826 } else { | |
| 827 /* GCC, you're too verbose. */ | |
| 828 cp = NULL; | |
| 829 } | |
| 830 len++; | |
| 831 maxlen = sp->fts_pathlen - len; | |
| 832 | |
| 833 level = cur->fts_level + 1; | |
| 834 | |
| 835 /* Read the directory, attaching each entry to the `link' pointer. */ | |
| 836 doadjust = false; | |
| 837 for (head = tail = NULL, nitems = 0; dirp && (dp = readdir(dirp));) { | |
| 838 if (!ISSET(FTS_SEEDOT) && ISDOT(dp->d_name)) | |
| 839 continue; | |
| 840 | |
| 841 if ((p = fts_alloc(sp, dp->d_name, NAMLEN (dp))) == NULL) | |
| 842 goto mem1; | |
| 843 if (NAMLEN (dp) >= maxlen) {/* include space for NUL */ | |
| 844 oldaddr = sp->fts_path; | |
| 845 if (! fts_palloc(sp, NAMLEN (dp) + len + 1)) { | |
| 846 /* | |
| 5907 | 847 * No more memory. Save |
| 5858 | 848 * errno, free up the current structure and the |
| 849 * structures already allocated. | |
| 850 */ | |
| 851 mem1: saved_errno = errno; | |
| 852 if (p) | |
| 853 free(p); | |
| 854 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
855 closedir(dirp); |
| 5858 | 856 cur->fts_info = FTS_ERR; |
| 857 SET(FTS_STOP); | |
| 858 __set_errno (saved_errno); | |
| 859 return (NULL); | |
| 860 } | |
| 861 /* Did realloc() change the pointer? */ | |
| 862 if (oldaddr != sp->fts_path) { | |
| 863 doadjust = true; | |
| 864 if (ISSET(FTS_NOCHDIR)) | |
| 865 cp = sp->fts_path + len; | |
| 866 } | |
| 867 maxlen = sp->fts_pathlen - len; | |
| 868 } | |
| 869 | |
| 870 new_len = len + NAMLEN (dp); | |
| 871 if (new_len < len) { | |
| 872 /* | |
| 873 * In the unlikely even that we would end up | |
| 5907 | 874 * with a file name longer than SIZE_MAX, free up |
| 5858 | 875 * the current structure and the structures already |
| 876 * allocated, then error out with ENAMETOOLONG. | |
| 877 */ | |
| 878 free(p); | |
| 879 fts_lfree(head); | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
880 closedir(dirp); |
| 5858 | 881 cur->fts_info = FTS_ERR; |
| 882 SET(FTS_STOP); | |
| 883 __set_errno (ENAMETOOLONG); | |
| 884 return (NULL); | |
| 885 } | |
| 886 p->fts_level = level; | |
| 887 p->fts_parent = sp->fts_cur; | |
| 888 p->fts_pathlen = new_len; | |
| 889 | |
| 890 #if defined FTS_WHITEOUT && 0 | |
| 891 if (dp->d_type == DT_WHT) | |
| 892 p->fts_flags |= FTS_ISW; | |
| 893 #endif | |
| 894 | |
| 895 if (cderrno) { | |
| 896 if (nlinks) { | |
| 897 p->fts_info = FTS_NS; | |
| 898 p->fts_errno = cderrno; | |
| 899 } else | |
| 900 p->fts_info = FTS_NSOK; | |
| 901 p->fts_accpath = cur->fts_accpath; | |
| 902 } else if (nlinks == 0 | |
| 903 #if HAVE_STRUCT_DIRENT_D_TYPE | |
| 904 || (nostat && | |
| 905 dp->d_type != DT_DIR && dp->d_type != DT_UNKNOWN) | |
| 906 #endif | |
| 907 ) { | |
| 908 p->fts_accpath = | |
| 909 ISSET(FTS_NOCHDIR) ? p->fts_path : p->fts_name; | |
| 910 p->fts_info = FTS_NSOK; | |
| 911 } else { | |
| 912 /* Build a file name for fts_stat to stat. */ | |
| 913 if (ISSET(FTS_NOCHDIR)) { | |
| 914 p->fts_accpath = p->fts_path; | |
| 915 memmove(cp, p->fts_name, p->fts_namelen + 1); | |
| 916 } else | |
| 917 p->fts_accpath = p->fts_name; | |
| 918 /* Stat it. */ | |
| 919 p->fts_info = fts_stat(sp, p, false); | |
| 920 | |
| 921 /* 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
|
922 if (nlinks > 0 && (p->fts_info == FTS_D || |
| 5858 | 923 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
|
924 nlinks -= nostat; |
| 5858 | 925 } |
| 926 | |
| 927 /* We walk in directory order so "ls -f" doesn't get upset. */ | |
| 928 p->fts_link = NULL; | |
| 929 if (head == NULL) | |
| 930 head = tail = p; | |
| 931 else { | |
| 932 tail->fts_link = p; | |
| 933 tail = p; | |
| 934 } | |
| 935 ++nitems; | |
| 936 } | |
| 937 if (dirp) | |
|
5867
67b499052f7f
* fts.c: Include fts_.h first, to check interface.
Paul Eggert <eggert@cs.ucla.edu>
parents:
5858
diff
changeset
|
938 closedir(dirp); |
| 5858 | 939 |
| 940 /* | |
| 5907 | 941 * If realloc() changed the address of the file name, adjust the |
| 5858 | 942 * addresses for the rest of the tree and the dir list. |
| 943 */ | |
| 944 if (doadjust) | |
| 945 fts_padjust(sp, head); | |
| 946 | |
| 947 /* | |
| 5907 | 948 * If not changing directories, reset the file name back to original |
| 5858 | 949 * state. |
| 950 */ | |
| 951 if (ISSET(FTS_NOCHDIR)) { | |
| 952 if (len == sp->fts_pathlen || nitems == 0) | |
| 953 --cp; | |
| 954 *cp = '\0'; | |
| 955 } | |
| 956 | |
| 957 /* | |
| 958 * If descended after called from fts_children or after called from | |
| 959 * fts_read and nothing found, get back. At the root level we use | |
| 5907 | 960 * the saved fd; if one of fts_open()'s arguments is a relative name |
| 5858 | 961 * to an empty directory, we wind up here with no other way back. If |
| 962 * can't get back, we're done. | |
| 963 */ | |
| 964 if (descend && (type == BCHILD || !nitems) && | |
| 965 (cur->fts_level == FTS_ROOTLEVEL ? | |
| 966 FCHDIR(sp, sp->fts_rfd) : | |
| 967 fts_safe_changedir(sp, cur->fts_parent, -1, ".."))) { | |
| 968 cur->fts_info = FTS_ERR; | |
| 969 SET(FTS_STOP); | |
| 970 return (NULL); | |
| 971 } | |
| 972 | |
| 973 /* If didn't find anything, return NULL. */ | |
| 974 if (!nitems) { | |
| 975 if (type == BREAD) | |
| 976 cur->fts_info = FTS_DP; | |
| 977 return (NULL); | |
| 978 } | |
| 979 | |
| 980 /* Sort the entries. */ | |
| 981 if (sp->fts_compar && nitems > 1) | |
| 982 head = fts_sort(sp, head, nitems); | |
| 983 return (head); | |
| 984 } | |
| 985 | |
| 986 #if FTS_DEBUG | |
| 987 | |
| 988 /* Walk ->fts_parent links starting at E_CURR, until the root of the | |
| 989 current hierarchy. There should be a directory with dev/inode | |
| 990 matching those of AD. If not, print a lot of diagnostics. */ | |
| 991 static void | |
| 992 find_matching_ancestor (FTSENT const *e_curr, struct Active_dir const *ad) | |
| 993 { | |
| 994 FTSENT const *ent; | |
| 995 for (ent = e_curr; ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 996 { | |
| 997 if (ad->ino == ent->fts_statp->st_ino | |
| 998 && ad->dev == ent->fts_statp->st_dev) | |
| 999 return; | |
| 1000 } | |
| 1001 printf ("ERROR: tree dir, %s, not active\n", ad->fts_ent->fts_accpath); | |
| 1002 printf ("active dirs:\n"); | |
| 1003 for (ent = e_curr; | |
| 1004 ent->fts_level >= FTS_ROOTLEVEL; ent = ent->fts_parent) | |
| 1005 printf (" %s(%"PRIuMAX"/%"PRIuMAX") to %s(%"PRIuMAX"/%"PRIuMAX")...\n", | |
| 1006 ad->fts_ent->fts_accpath, | |
| 1007 (uintmax_t) ad->dev, | |
| 1008 (uintmax_t) ad->ino, | |
| 1009 ent->fts_accpath, | |
| 1010 (uintmax_t) ent->fts_statp->st_dev, | |
| 1011 (uintmax_t) ent->fts_statp->st_ino); | |
| 1012 } | |
| 1013 | |
| 1014 void | |
| 1015 fts_cross_check (FTS const *sp) | |
| 1016 { | |
| 1017 FTSENT const *ent = sp->fts_cur; | |
| 1018 FTSENT const *t; | |
| 1019 if ( ! ISSET (FTS_TIGHT_CYCLE_CHECK)) | |
| 1020 return; | |
| 1021 | |
| 1022 Dprintf (("fts-cross-check cur=%s\n", ent->fts_path)); | |
| 1023 /* Make sure every parent dir is in the tree. */ | |
| 1024 for (t = ent->fts_parent; t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1025 { | |
| 1026 struct Active_dir ad; | |
| 1027 ad.ino = t->fts_statp->st_ino; | |
| 1028 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
|
1029 if ( ! hash_lookup (sp->fts_cycle.ht, &ad)) |
| 5858 | 1030 printf ("ERROR: active dir, %s, not in tree\n", t->fts_path); |
| 1031 } | |
| 1032 | |
| 1033 /* Make sure every dir in the tree is an active dir. | |
| 1034 But ENT is not necessarily a directory. If so, just skip this part. */ | |
| 1035 if (ent->fts_parent->fts_level >= FTS_ROOTLEVEL | |
| 1036 && (ent->fts_info == FTS_DP | |
| 1037 || ent->fts_info == FTS_D)) | |
| 1038 { | |
| 1039 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
|
1040 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
|
1041 ad = hash_get_next (sp->fts_cycle.ht, ad)) |
| 5858 | 1042 { |
| 1043 find_matching_ancestor (ent, ad); | |
| 1044 } | |
| 1045 } | |
| 1046 } | |
| 1047 #endif | |
| 1048 | |
| 1049 static unsigned short int | |
| 1050 internal_function | |
| 1051 fts_stat(FTS *sp, register FTSENT *p, bool follow) | |
| 1052 { | |
| 1053 struct stat *sbp = p->fts_statp; | |
| 1054 int saved_errno; | |
| 1055 | |
| 1056 #if defined FTS_WHITEOUT && 0 | |
| 1057 /* check for whiteout */ | |
| 1058 if (p->fts_flags & FTS_ISW) { | |
| 1059 memset(sbp, '\0', sizeof (*sbp)); | |
| 1060 sbp->st_mode = S_IFWHT; | |
| 1061 return (FTS_W); | |
| 1062 } | |
| 1063 #endif | |
| 1064 | |
| 1065 /* | |
| 1066 * If doing a logical walk, or application requested FTS_FOLLOW, do | |
| 1067 * a stat(2). If that fails, check for a non-existent symlink. If | |
| 1068 * fail, set the errno from the stat call. | |
| 1069 */ | |
| 1070 if (ISSET(FTS_LOGICAL) || follow) { | |
| 1071 if (stat(p->fts_accpath, sbp)) { | |
| 1072 saved_errno = errno; | |
|
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Jim Meyering <jim@meyering.net>
parents:
6540
diff
changeset
|
1073 if (errno == ENOENT |
|
e4456c51dde7
Sync from the stable (b5) branch of coreutils:
Jim Meyering <jim@meyering.net>
parents:
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diff
changeset
|
1074 && lstat(p->fts_accpath, sbp) == 0) { |
| 5858 | 1075 __set_errno (0); |
| 1076 return (FTS_SLNONE); | |
| 1077 } | |
| 1078 p->fts_errno = saved_errno; | |
| 1079 goto err; | |
| 1080 } | |
| 1081 } else if (lstat(p->fts_accpath, sbp)) { | |
| 1082 p->fts_errno = errno; | |
| 1083 err: memset(sbp, 0, sizeof(struct stat)); | |
| 1084 return (FTS_NS); | |
| 1085 } | |
| 1086 | |
| 1087 if (S_ISDIR(sbp->st_mode)) { | |
| 1088 if (ISDOT(p->fts_name)) | |
| 1089 return (FTS_DOT); | |
| 5872 | 1090 |
| 1091 #if _LGPL_PACKAGE | |
| 1092 { | |
| 1093 /* | |
| 1094 * Cycle detection is done by brute force when the directory | |
| 1095 * is first encountered. If the tree gets deep enough or the | |
| 1096 * number of symbolic links to directories is high enough, | |
| 1097 * something faster might be worthwhile. | |
| 1098 */ | |
| 1099 FTSENT *t; | |
| 1100 | |
| 1101 for (t = p->fts_parent; | |
| 1102 t->fts_level >= FTS_ROOTLEVEL; t = t->fts_parent) | |
| 1103 if (sbp->st_ino == t->fts_statp->st_ino | |
| 1104 && sbp->st_dev == t->fts_statp->st_dev) | |
| 1105 { | |
| 1106 p->fts_cycle = t; | |
| 1107 return (FTS_DC); | |
| 1108 } | |
| 1109 } | |
| 1110 #endif | |
| 1111 | |
| 5858 | 1112 return (FTS_D); |
| 1113 } | |
| 1114 if (S_ISLNK(sbp->st_mode)) | |
| 1115 return (FTS_SL); | |
| 1116 if (S_ISREG(sbp->st_mode)) | |
| 1117 return (FTS_F); | |
| 1118 return (FTS_DEFAULT); | |
| 1119 } | |
| 1120 | |
| 1121 static int | |
| 1122 fts_compar (void const *a, void const *b) | |
| 1123 { | |
| 1124 /* Convert A and B to the correct types, to pacify the compiler, and | |
| 1125 for portability to bizarre hosts where "void const *" and "FTSENT | |
| 1126 const **" differ in runtime representation. The comparison | |
| 1127 function cannot modify *a and *b, but there is no compile-time | |
| 1128 check for this. */ | |
| 1129 FTSENT const **pa = (FTSENT const **) a; | |
| 1130 FTSENT const **pb = (FTSENT const **) b; | |
| 1131 return pa[0]->fts_fts->fts_compar (pa, pb); | |
| 1132 } | |
| 1133 | |
| 1134 static FTSENT * | |
| 1135 internal_function | |
| 1136 fts_sort (FTS *sp, FTSENT *head, register size_t nitems) | |
| 1137 { | |
| 1138 register FTSENT **ap, *p; | |
| 1139 | |
| 1140 /* On most modern hosts, void * and FTSENT ** have the same | |
| 1141 run-time representation, and one can convert sp->fts_compar to | |
| 1142 the type qsort expects without problem. Use the heuristic that | |
| 1143 this is OK if the two pointer types are the same size, and if | |
| 1144 converting FTSENT ** to long int is the same as converting | |
| 1145 FTSENT ** to void * and then to long int. This heuristic isn't | |
| 1146 valid in general but we don't know of any counterexamples. */ | |
| 1147 FTSENT *dummy; | |
| 1148 int (*compare) (void const *, void const *) = | |
| 1149 ((sizeof &dummy == sizeof (void *) | |
| 1150 && (long int) &dummy == (long int) (void *) &dummy) | |
| 1151 ? (int (*) (void const *, void const *)) sp->fts_compar | |
| 1152 : fts_compar); | |
| 1153 | |
| 1154 /* | |
| 1155 * Construct an array of pointers to the structures and call qsort(3). | |
| 1156 * Reassemble the array in the order returned by qsort. If unable to | |
| 1157 * sort for memory reasons, return the directory entries in their | |
| 1158 * current order. Allocate enough space for the current needs plus | |
| 1159 * 40 so don't realloc one entry at a time. | |
| 1160 */ | |
| 1161 if (nitems > sp->fts_nitems) { | |
| 1162 struct _ftsent **a; | |
| 1163 | |
| 1164 sp->fts_nitems = nitems + 40; | |
| 1165 if (SIZE_MAX / sizeof *a < sp->fts_nitems | |
| 1166 || ! (a = realloc (sp->fts_array, | |
| 1167 sp->fts_nitems * sizeof *a))) { | |
| 1168 free(sp->fts_array); | |
| 1169 sp->fts_array = NULL; | |
| 1170 sp->fts_nitems = 0; | |
| 1171 return (head); | |
| 1172 } | |
| 1173 sp->fts_array = a; | |
| 1174 } | |
| 1175 for (ap = sp->fts_array, p = head; p; p = p->fts_link) | |
| 1176 *ap++ = p; | |
| 1177 qsort((void *)sp->fts_array, nitems, sizeof(FTSENT *), compare); | |
| 1178 for (head = *(ap = sp->fts_array); --nitems; ++ap) | |
| 1179 ap[0]->fts_link = ap[1]; | |
| 1180 ap[0]->fts_link = NULL; | |
| 1181 return (head); | |
| 1182 } | |
| 1183 | |
| 1184 static FTSENT * | |
| 1185 internal_function | |
| 1186 fts_alloc (FTS *sp, const char *name, register size_t namelen) | |
| 1187 { | |
| 1188 register FTSENT *p; | |
| 1189 size_t len; | |
| 1190 | |
| 1191 /* | |
| 1192 * The file name is a variable length array. Allocate the FTSENT | |
| 1193 * structure and the file name in one chunk. | |
| 1194 */ | |
| 1195 len = sizeof(FTSENT) + namelen; | |
| 1196 if ((p = malloc(len)) == NULL) | |
| 1197 return (NULL); | |
| 1198 | |
| 1199 /* Copy the name and guarantee NUL termination. */ | |
| 1200 memmove(p->fts_name, name, namelen); | |
| 1201 p->fts_name[namelen] = '\0'; | |
| 1202 | |
| 1203 p->fts_namelen = namelen; | |
| 1204 p->fts_fts = sp; | |
| 1205 p->fts_path = sp->fts_path; | |
| 1206 p->fts_errno = 0; | |
| 1207 p->fts_flags = 0; | |
| 1208 p->fts_instr = FTS_NOINSTR; | |
| 1209 p->fts_number = 0; | |
| 1210 p->fts_pointer = NULL; | |
| 1211 return (p); | |
| 1212 } | |
| 1213 | |
| 1214 static void | |
| 1215 internal_function | |
| 1216 fts_lfree (register FTSENT *head) | |
| 1217 { | |
| 1218 register FTSENT *p; | |
| 1219 | |
| 1220 /* Free a linked list of structures. */ | |
| 1221 while ((p = head)) { | |
| 1222 head = head->fts_link; | |
| 1223 free(p); | |
| 1224 } | |
| 1225 } | |
| 1226 | |
| 1227 /* | |
| 5907 | 1228 * Allow essentially unlimited file name lengths; find, rm, ls should |
| 1229 * all work on any tree. Most systems will allow creation of file | |
| 1230 * names much longer than MAXPATHLEN, even though the kernel won't | |
| 1231 * resolve them. Add the size (not just what's needed) plus 256 bytes | |
| 1232 * so don't realloc the file name 2 bytes at a time. | |
| 5858 | 1233 */ |
| 1234 static bool | |
| 1235 internal_function | |
| 1236 fts_palloc (FTS *sp, size_t more) | |
| 1237 { | |
| 1238 char *p; | |
| 1239 size_t new_len = sp->fts_pathlen + more + 256; | |
| 1240 | |
| 1241 /* | |
| 1242 * See if fts_pathlen would overflow. | |
| 1243 */ | |
| 1244 if (new_len < sp->fts_pathlen) { | |
| 1245 if (sp->fts_path) { | |
| 1246 free(sp->fts_path); | |
| 1247 sp->fts_path = NULL; | |
| 1248 } | |
| 1249 sp->fts_path = NULL; | |
| 1250 __set_errno (ENAMETOOLONG); | |
| 1251 return false; | |
| 1252 } | |
| 1253 sp->fts_pathlen = new_len; | |
| 1254 p = realloc(sp->fts_path, sp->fts_pathlen); | |
| 1255 if (p == NULL) { | |
| 1256 free(sp->fts_path); | |
| 1257 sp->fts_path = NULL; | |
| 1258 return false; | |
| 1259 } | |
| 1260 sp->fts_path = p; | |
| 1261 return true; | |
| 1262 } | |
| 1263 | |
| 1264 /* | |
| 5907 | 1265 * When the file name is realloc'd, have to fix all of the pointers in |
| 1266 * structures already returned. | |
| 5858 | 1267 */ |
| 1268 static void | |
| 1269 internal_function | |
| 1270 fts_padjust (FTS *sp, FTSENT *head) | |
| 1271 { | |
| 1272 FTSENT *p; | |
| 1273 char *addr = sp->fts_path; | |
| 1274 | |
| 1275 #define ADJUST(p) do { \ | |
| 1276 if ((p)->fts_accpath != (p)->fts_name) { \ | |
| 1277 (p)->fts_accpath = \ | |
| 1278 (char *)addr + ((p)->fts_accpath - (p)->fts_path); \ | |
| 1279 } \ | |
| 1280 (p)->fts_path = addr; \ | |
| 1281 } while (0) | |
| 1282 /* Adjust the current set of children. */ | |
| 1283 for (p = sp->fts_child; p; p = p->fts_link) | |
| 1284 ADJUST(p); | |
| 1285 | |
| 1286 /* Adjust the rest of the tree, including the current level. */ | |
| 1287 for (p = head; p->fts_level >= FTS_ROOTLEVEL;) { | |
| 1288 ADJUST(p); | |
| 1289 p = p->fts_link ? p->fts_link : p->fts_parent; | |
| 1290 } | |
| 1291 } | |
| 1292 | |
| 1293 static size_t | |
| 1294 internal_function | |
| 1295 fts_maxarglen (char * const *argv) | |
| 1296 { | |
| 1297 size_t len, max; | |
| 1298 | |
| 1299 for (max = 0; *argv; ++argv) | |
| 1300 if ((len = strlen(*argv)) > max) | |
| 1301 max = len; | |
| 1302 return (max + 1); | |
| 1303 } | |
| 1304 | |
| 1305 /* | |
| 5907 | 1306 * Change to dir specified by fd or file name without getting |
| 5858 | 1307 * tricked by someone changing the world out from underneath us. |
| 1308 * Assumes p->fts_statp->st_dev and p->fts_statp->st_ino are filled in. | |
| 1309 */ | |
| 1310 static int | |
| 1311 internal_function | |
| 5907 | 1312 fts_safe_changedir (FTS *sp, FTSENT *p, int fd, char const *dir) |
| 5858 | 1313 { |
| 1314 int ret, oerrno, newfd; | |
| 1315 struct stat sb; | |
| 1316 | |
| 1317 newfd = fd; | |
| 1318 if (ISSET(FTS_NOCHDIR)) | |
| 1319 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
|
1320 if (fd < 0 && (newfd = diropen (dir)) < 0) |
| 5858 | 1321 return (-1); |
| 1322 if (fstat(newfd, &sb)) { | |
| 1323 ret = -1; | |
| 1324 goto bail; | |
| 1325 } | |
| 1326 if (p->fts_statp->st_dev != sb.st_dev | |
| 1327 || p->fts_statp->st_ino != sb.st_ino) { | |
| 1328 __set_errno (ENOENT); /* disinformation */ | |
| 1329 ret = -1; | |
| 1330 goto bail; | |
| 1331 } | |
| 1332 ret = fchdir(newfd); | |
| 1333 bail: | |
| 1334 oerrno = errno; | |
| 1335 if (fd < 0) | |
| 1336 (void)close(newfd); | |
| 1337 __set_errno (oerrno); | |
| 1338 return (ret); | |
| 1339 } |