io/ftw.c

   1 /* File tree walker functions.
   2    Copyright (C) 1996-2003, 2004, 2006 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1996.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, write to the Free
  18    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  19    02111-1307 USA.  */
  20
  21 #ifdef HAVE_CONFIG_H
  22 # include <config.h>
  23 #endif
  24
  25 #if __GNUC__
  26 # define alloca __builtin_alloca
  27 #else
  28 # if HAVE_ALLOCA_H
  29 #  include <alloca.h>
  30 # else
  31 #  ifdef _AIX
  32  #  pragma alloca
  33 #  else
  34 char *alloca ();
  35 #  endif
  36 # endif
  37 #endif
  38
  39 #ifdef _LIBC
  40 # include <dirent.h>
  41 # define NAMLEN(dirent) _D_EXACT_NAMLEN (dirent)
  42 #else
  43 # if HAVE_DIRENT_H
  44 #  include <dirent.h>
  45 #  define NAMLEN(dirent) strlen ((dirent)->d_name)
  46 # else
  47 #  define dirent direct
  48 #  define NAMLEN(dirent) (dirent)->d_namlen
  49 #  if HAVE_SYS_NDIR_H
  50 #   include <sys/ndir.h>
  51 #  endif
  52 #  if HAVE_SYS_DIR_H
  53 #   include <sys/dir.h>
  54 #  endif
  55 #  if HAVE_NDIR_H
  56 #   include <ndir.h>
  57 #  endif
  58 # endif
  59 #endif
  60
  61 #include <errno.h>
  62 #include <fcntl.h>
  63 #include <ftw.h>
  64 #include <limits.h>
  65 #include <search.h>
  66 #include <stdlib.h>
  67 #include <string.h>
  68 #include <unistd.h>
  69 #include <not-cancel.h>
  70 #if HAVE_SYS_PARAM_H || defined _LIBC
  71 # include <sys/param.h>
  72 #endif
  73 #ifdef _LIBC
  74 # include <include/sys/stat.h>
  75 #else
  76 # include <sys/stat.h>
  77 #endif
  78
  79 #if ! _LIBC && !HAVE_DECL_STPCPY && !defined stpcpy
  80 char *stpcpy ();
  81 #endif
  82
  83 #if ! _LIBC && ! defined HAVE_MEMPCPY && ! defined mempcpy
  84 /* Be CAREFUL that there are no side effects in N.  */
  85 # define mempcpy(D, S, N) ((void *) ((char *) memcpy (D, S, N) + (N)))
  86 #endif
  87
  88 /* #define NDEBUG 1 */
  89 #include <assert.h>
  90
  91 #ifndef _LIBC
  92 # undef __chdir
  93 # define __chdir chdir
  94 # undef __closedir
  95 # define __closedir closedir
  96 # undef __fchdir
  97 # define __fchdir fchdir
  98 # undef __getcwd
  99 # define __getcwd(P, N) xgetcwd ()
 100 extern char *xgetcwd (void);
 101 # undef __mempcpy
 102 # define __mempcpy mempcpy
 103 # undef __opendir
 104 # define __opendir opendir
 105 # undef __readdir64
 106 # define __readdir64 readdir
 107 # undef __stpcpy
 108 # define __stpcpy stpcpy
 109 # undef __tdestroy
 110 # define __tdestroy tdestroy
 111 # undef __tfind
 112 # define __tfind tfind
 113 # undef __tsearch
 114 # define __tsearch tsearch
 115 # undef internal_function
 116 # define internal_function /* empty */
 117 # undef dirent64
 118 # define dirent64 dirent
 119 # undef MAX
 120 # define MAX(a, b) ((a) > (b) ? (a) : (b))
 121 #endif
 122
 123 /* Arrange to make lstat calls go through the wrapper function
 124    on systems with an lstat function that does not dereference symlinks
 125    that are specified with a trailing slash.  */
 126 #if ! _LIBC && ! LSTAT_FOLLOWS_SLASHED_SYMLINK
 127 int rpl_lstat (const char *, struct stat *);
 128 # undef lstat
 129 # define lstat(Name, Stat_buf) rpl_lstat(Name, Stat_buf)
 130 #endif
 131
 132 #ifndef __set_errno
 133 # define __set_errno(Val) errno = (Val)
 134 #endif
 135
 136 /* Support for the LFS API version.  */
 137 #ifndef FTW_NAME
 138 # define FTW_NAME ftw
 139 # define NFTW_NAME nftw
 140 # define NFTW_OLD_NAME __old_nftw
 141 # define NFTW_NEW_NAME __new_nftw
 142 # define INO_T ino_t
 143 # define STAT stat
 144 # ifdef _LIBC
 145 #  define LXSTAT __lxstat
 146 #  define XSTAT __xstat
 147 #  define FXSTATAT __fxstatat
 148 # else
 149 #  define LXSTAT(V,f,sb) lstat (f,sb)
 150 #  define XSTAT(V,f,sb) stat (f,sb)
 151 #  define FXSTATAT(V,d,f,sb,m) fstatat (d, f, sb, m)
 152 # endif
 153 # define FTW_FUNC_T __ftw_func_t
 154 # define NFTW_FUNC_T __nftw_func_t
 155 #endif
 156
 157 /* We define PATH_MAX if the system does not provide a definition.
 158    This does not artificially limit any operation.  PATH_MAX is simply
 159    used as a guesstimate for the expected maximal path length.
 160    Buffers will be enlarged if necessary.  */
 161 #ifndef PATH_MAX
 162 # define PATH_MAX 1024
 163 #endif
 164
 165 struct dir_data
 166 {
 167   DIR *stream;
 168   int streamfd;
 169   char *content;
 170 };
 171
 172 struct known_object
 173 {
 174   dev_t dev;
 175   INO_T ino;
 176 };
 177
 178 struct ftw_data
 179 {
 180   /* Array with pointers to open directory streams.  */
 181   struct dir_data **dirstreams;
 182   size_t actdir;
 183   size_t maxdir;
 184
 185   /* Buffer containing name of currently processed object.  */
 186   char *dirbuf;
 187   size_t dirbufsize;
 188
 189   /* Passed as fourth argument to `nftw' callback.  The `base' member
 190      tracks the content of the `dirbuf'.  */
 191   struct FTW ftw;
 192
 193   /* Flags passed to `nftw' function.  0 for `ftw'.  */
 194   int flags;
 195
 196   /* Conversion array for flag values.  It is the identity mapping for
 197      `nftw' calls, otherwise it maps the values to those known by
 198      `ftw'.  */
 199   const int *cvt_arr;
 200
 201   /* Callback function.  We always use the `nftw' form.  */
 202   NFTW_FUNC_T func;
 203
 204   /* Device of starting point.  Needed for FTW_MOUNT.  */
 205   dev_t dev;
 206
 207   /* Data structure for keeping fingerprints of already processed
 208      object.  This is needed when not using FTW_PHYS.  */
 209   void *known_objects;
 210 };
 211
 212
 213 /* Internally we use the FTW_* constants used for `nftw'.  When invoked
 214    as `ftw', map each flag to the subset of values used by `ftw'.  */
 215 static const int nftw_arr[] =
 216 {
 217   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_SL, FTW_DP, FTW_SLN
 218 };
 219
 220 static const int ftw_arr[] =
 221 {
 222   FTW_F, FTW_D, FTW_DNR, FTW_NS, FTW_F, FTW_D, FTW_NS
 223 };
 224
 225
 226 /* Forward declarations of local functions.  */
 227 static int ftw_dir (struct ftw_data *data, struct STAT *st,
 228                     struct dir_data *old_dir) internal_function;
 229
 230
 231 static int
 232 object_compare (const void *p1, const void *p2)
 233 {
 234   /* We don't need a sophisticated and useful comparison.  We are only
 235      interested in equality.  However, we must be careful not to
 236      accidentally compare `holes' in the structure.  */
 237   const struct known_object *kp1 = p1, *kp2 = p2;
 238   int cmp1;
 239   cmp1 = (kp1->ino > kp2->ino) - (kp1->ino < kp2->ino);
 240   if (cmp1 != 0)
 241     return cmp1;
 242   return (kp1->dev > kp2->dev) - (kp1->dev < kp2->dev);
 243 }
 244
 245
 246 static inline int
 247 add_object (struct ftw_data *data, struct STAT *st)
 248 {
 249   struct known_object *newp = malloc (sizeof (struct known_object));
 250   if (newp == NULL)
 251     return -1;
 252   newp->dev = st->st_dev;
 253   newp->ino = st->st_ino;
 254   return __tsearch (newp, &data->known_objects, object_compare) ? 0 : -1;
 255 }
 256
 257
 258 static inline int
 259 find_object (struct ftw_data *data, struct STAT *st)
 260 {
 261   struct known_object obj;
 262   obj.dev = st->st_dev;
 263   obj.ino = st->st_ino;
 264   return __tfind (&obj, &data->known_objects, object_compare) != NULL;
 265 }
 266
 267
 268 static inline int
 269 __attribute ((always_inline))
 270 open_dir_stream (int *dfdp, struct ftw_data *data, struct dir_data *dirp)
 271 {
 272   int result = 0;
 273
 274   if (data->dirstreams[data->actdir] != NULL)
 275     {
 276       /* Oh, oh.  We must close this stream.  Get all remaining
 277          entries and store them as a list in the `content' member of
 278          the `struct dir_data' variable.  */
 279       size_t bufsize = 1024;
 280       char *buf = malloc (bufsize);
 281
 282       if (buf == NULL)
 283         result = -1;
 284       else
 285         {
 286           DIR *st = data->dirstreams[data->actdir]->stream;
 287           struct dirent64 *d;
 288           size_t actsize = 0;
 289
 290           while ((d = __readdir64 (st)) != NULL)
 291             {
 292               size_t this_len = NAMLEN (d);
 293               if (actsize + this_len + 2 >= bufsize)
 294                 {
 295                   char *newp;
 296                   bufsize += MAX (1024, 2 * this_len);
 297                   newp = (char *) realloc (buf, bufsize);
 298                   if (newp == NULL)
 299                     {
 300                       /* No more memory.  */
 301                       int save_err = errno;
 302                       free (buf);
 303                       __set_errno (save_err);
 304                       return -1;
 305                     }
 306                   buf = newp;
 307                 }
 308
 309               *((char *) __mempcpy (buf + actsize, d->d_name, this_len))
 310                 = '\0';
 311               actsize += this_len + 1;
 312             }
 313
 314           /* Terminate the list with an additional NUL byte.  */
 315           buf[actsize++] = '\0';
 316
 317           /* Shrink the buffer to what we actually need.  */
 318           data->dirstreams[data->actdir]->content = realloc (buf, actsize);
 319           if (data->dirstreams[data->actdir]->content == NULL)
 320             {
 321               int save_err = errno;
 322               free (buf);
 323               __set_errno (save_err);
 324               result = -1;
 325             }
 326           else
 327             {
 328               __closedir (st);
 329               data->dirstreams[data->actdir]->stream = NULL;
 330               data->dirstreams[data->actdir]->streamfd = -1;
 331               data->dirstreams[data->actdir] = NULL;
 332             }
 333         }
 334     }
 335
 336   /* Open the new stream.  */
 337   if (result == 0)
 338     {
 339       assert (data->dirstreams[data->actdir] == NULL);
 340
 341       if (dfdp != NULL && *dfdp != -1)
 342         {
 343           int fd = openat64_not_cancel_3 (*dfdp, data->dirbuf + data->ftw.base,
 344                                           O_RDONLY | O_DIRECTORY | O_NDELAY);
 345           dirp->stream = NULL;
 346           if (fd != -1 && (dirp->stream = __fdopendir (fd)) == NULL)
 347             close_not_cancel_no_status (fd);
 348         }
 349       else
 350         {
 351           const char *name = ((data->flags & FTW_CHDIR)
 352                               ? data->dirbuf + data->ftw.base: data->dirbuf);
 353           dirp->stream = __opendir (name);
 354         }
 355
 356       if (dirp->stream == NULL)
 357         result = -1;
 358       else
 359         {
 360           dirp->streamfd = dirfd (dirp->stream);
 361           dirp->content = NULL;
 362           data->dirstreams[data->actdir] = dirp;
 363
 364           if (++data->actdir == data->maxdir)
 365             data->actdir = 0;
 366         }
 367     }
 368
 369   return result;
 370 }
 371
 372
 373 static int
 374 internal_function
 375 process_entry (struct ftw_data *data, struct dir_data *dir, const char *name,
 376                size_t namlen, int d_type)
 377 {
 378   struct STAT st;
 379   int result = 0;
 380   int flag = 0;
 381   size_t new_buflen;
 382
 383   if (name[0] == '.' && (name[1] == '\0'
 384                          || (name[1] == '.' && name[2] == '\0')))
 385     /* Don't process the "." and ".." entries.  */
 386     return 0;
 387
 388   new_buflen = data->ftw.base + namlen + 2;
 389   if (data->dirbufsize < new_buflen)
 390     {
 391       /* Enlarge the buffer.  */
 392       char *newp;
 393
 394       data->dirbufsize = 2 * new_buflen;
 395       newp = (char *) realloc (data->dirbuf, data->dirbufsize);
 396       if (newp == NULL)
 397         return -1;
 398       data->dirbuf = newp;
 399     }
 400
 401   *((char *) __mempcpy (data->dirbuf + data->ftw.base, name, namlen)) = '\0';
 402
 403   int statres;
 404   if (dir->streamfd != -1)
 405     statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
 406                         (data->flags & FTW_PHYS) ? AT_SYMLINK_NOFOLLOW : 0);
 407   else
 408     {
 409       if ((data->flags & FTW_CHDIR) == 0)
 410         name = data->dirbuf;
 411
 412       statres = ((data->flags & FTW_PHYS)
 413                  ? LXSTAT (_STAT_VER, name, &st)
 414                  : XSTAT (_STAT_VER, name, &st));
 415     }
 416
 417   if (statres < 0)
 418     {
 419       if (errno != EACCES && errno != ENOENT)
 420         result = -1;
 421       else if (data->flags & FTW_PHYS)
 422         flag = FTW_NS;
 423       else if (d_type == DT_LNK)
 424         flag = FTW_SLN;
 425       else
 426         {
 427           if (dir->streamfd != -1)
 428             statres = FXSTATAT (_STAT_VER, dir->streamfd, name, &st,
 429                                 AT_SYMLINK_NOFOLLOW);
 430           else
 431             statres = LXSTAT (_STAT_VER, name, &st);
 432           if (statres == 0 && S_ISLNK (st.st_mode))
 433             flag = FTW_SLN;
 434           else
 435             flag = FTW_NS;
 436         }
 437     }
 438   else
 439     {
 440       if (S_ISDIR (st.st_mode))
 441         flag = FTW_D;
 442       else if (S_ISLNK (st.st_mode))
 443         flag = FTW_SL;
 444       else
 445         flag = FTW_F;
 446     }
 447
 448   if (result == 0
 449       && (flag == FTW_NS
 450           || !(data->flags & FTW_MOUNT) || st.st_dev == data->dev))
 451     {
 452       if (flag == FTW_D)
 453         {
 454           if ((data->flags & FTW_PHYS)
 455               || (!find_object (data, &st)
 456                   /* Remember the object.  */
 457                   && (result = add_object (data, &st)) == 0))
 458             result = ftw_dir (data, &st, dir);
 459         }
 460       else
 461         result = (*data->func) (data->dirbuf, &st, data->cvt_arr[flag],
 462                                 &data->ftw);
 463     }
 464
 465   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SUBTREE)
 466     result = 0;
 467
 468   return result;
 469 }
 470
 471
 472 static int
 473 __attribute ((noinline))
 474 internal_function
 475 ftw_dir (struct ftw_data *data, struct STAT *st, struct dir_data *old_dir)
 476 {
 477   struct dir_data dir;
 478   struct dirent64 *d;
 479   int previous_base = data->ftw.base;
 480   int result;
 481   char *startp;
 482
 483   /* Open the stream for this directory.  This might require that
 484      another stream has to be closed.  */
 485   result = open_dir_stream (old_dir == NULL ? NULL : &old_dir->streamfd,
 486                             data, &dir);
 487   if (result != 0)
 488     {
 489       if (errno == EACCES)
 490         /* We cannot read the directory.  Signal this with a special flag.  */
 491         result = (*data->func) (data->dirbuf, st, FTW_DNR, &data->ftw);
 492
 493       return result;
 494     }
 495
 496   /* First, report the directory (if not depth-first).  */
 497   if (!(data->flags & FTW_DEPTH))
 498     {
 499       result = (*data->func) (data->dirbuf, st, FTW_D, &data->ftw);
 500       if (result != 0)
 501         {
 502           int save_err;
 503 fail:
 504           save_err = errno;
 505           __closedir (dir.stream);
 506           dir.streamfd = -1;
 507           __set_errno (save_err);
 508
 509           if (data->actdir-- == 0)
 510             data->actdir = data->maxdir - 1;
 511           data->dirstreams[data->actdir] = NULL;
 512           return result;
 513         }
 514     }
 515
 516   /* If necessary, change to this directory.  */
 517   if (data->flags & FTW_CHDIR)
 518     {
 519       if (__fchdir (dirfd (dir.stream)) < 0)
 520         {
 521           result = -1;
 522           goto fail;
 523         }
 524     }
 525
 526   /* Next, update the `struct FTW' information.  */
 527   ++data->ftw.level;
 528   startp = __rawmemchr (data->dirbuf, '\0');
 529   /* There always must be a directory name.  */
 530   assert (startp != data->dirbuf);
 531   if (startp[-1] != '/')
 532     *startp++ = '/';
 533   data->ftw.base = startp - data->dirbuf;
 534
 535   while (dir.stream != NULL && (d = __readdir64 (dir.stream)) != NULL)
 536     {
 537       result = process_entry (data, &dir, d->d_name, NAMLEN (d), d->d_type);
 538       if (result != 0)
 539         break;
 540     }
 541
 542   if (dir.stream != NULL)
 543     {
 544       /* The stream is still open.  I.e., we did not need more
 545          descriptors.  Simply close the stream now.  */
 546       int save_err = errno;
 547
 548       assert (dir.content == NULL);
 549
 550       __closedir (dir.stream);
 551       dir.streamfd = -1;
 552       __set_errno (save_err);
 553
 554       if (data->actdir-- == 0)
 555         data->actdir = data->maxdir - 1;
 556       data->dirstreams[data->actdir] = NULL;
 557     }
 558   else
 559     {
 560       int save_err;
 561       char *runp = dir.content;
 562
 563       while (result == 0 && *runp != '\0')
 564         {
 565           char *endp = strchr (runp, '\0');
 566
 567           // XXX Should store the d_type values as well?!
 568           result = process_entry (data, &dir, runp, endp - runp, DT_UNKNOWN);
 569
 570           runp = endp + 1;
 571         }
 572
 573       save_err = errno;
 574       free (dir.content);
 575       __set_errno (save_err);
 576     }
 577
 578   if ((data->flags & FTW_ACTIONRETVAL) && result == FTW_SKIP_SIBLINGS)
 579     result = 0;
 580
 581   /* Prepare the return, revert the `struct FTW' information.  */
 582   data->dirbuf[data->ftw.base - 1] = '\0';
 583   --data->ftw.level;
 584   data->ftw.base = previous_base;
 585
 586   /* Finally, if we process depth-first report the directory.  */
 587   if (result == 0 && (data->flags & FTW_DEPTH))
 588     result = (*data->func) (data->dirbuf, st, FTW_DP, &data->ftw);
 589
 590   if (old_dir
 591       && (data->flags & FTW_CHDIR)
 592       && (result == 0
 593           || ((data->flags & FTW_ACTIONRETVAL)
 594               && (result != -1 && result != FTW_STOP))))
 595     {
 596       /* Change back to the parent directory.  */
 597       int done = 0;
 598       if (old_dir->stream != NULL)
 599         if (__fchdir (dirfd (old_dir->stream)) == 0)
 600           done = 1;
 601
 602       if (!done)
 603         {
 604           if (data->ftw.base == 1)
 605             {
 606               if (__chdir ("/") < 0)
 607                 result = -1;
 608             }
 609           else
 610             if (__chdir ("..") < 0)
 611               result = -1;
 612         }
 613     }
 614
 615   return result;
 616 }
 617
 618
 619 static int
 620 __attribute ((noinline))
 621 internal_function
 622 ftw_startup (const char *dir, int is_nftw, void *func, int descriptors,
 623              int flags)
 624 {
 625   struct ftw_data data;
 626   struct STAT st;
 627   int result = 0;
 628   int save_err;
 629   int cwdfd = -1;
 630   char *cwd = NULL;
 631   char *cp;
 632
 633   /* First make sure the parameters are reasonable.  */
 634   if (dir[0] == '\0')
 635     {
 636       __set_errno (ENOENT);
 637       return -1;
 638     }
 639
 640   data.maxdir = descriptors < 1 ? 1 : descriptors;
 641   data.actdir = 0;
 642   data.dirstreams = (struct dir_data **) alloca (data.maxdir
 643                                                  * sizeof (struct dir_data *));
 644   memset (data.dirstreams, '\0', data.maxdir * sizeof (struct dir_data *));
 645
 646   /* PATH_MAX is always defined when we get here.  */
 647   data.dirbufsize = MAX (2 * strlen (dir), PATH_MAX);
 648   data.dirbuf = (char *) malloc (data.dirbufsize);
 649   if (data.dirbuf == NULL)
 650     return -1;
 651   cp = __stpcpy (data.dirbuf, dir);
 652   /* Strip trailing slashes.  */
 653   while (cp > data.dirbuf + 1 && cp[-1] == '/')
 654     --cp;
 655   *cp = '\0';
 656
 657   data.ftw.level = 0;
 658
 659   /* Find basename.  */
 660   while (cp > data.dirbuf && cp[-1] != '/')
 661     --cp;
 662   data.ftw.base = cp - data.dirbuf;
 663
 664   data.flags = flags;
 665
 666   /* This assignment might seem to be strange but it is what we want.
 667      The trick is that the first three arguments to the `ftw' and
 668      `nftw' callback functions are equal.  Therefore we can call in
 669      every case the callback using the format of the `nftw' version
 670      and get the correct result since the stack layout for a function
 671      call in C allows this.  */
 672   data.func = (NFTW_FUNC_T) func;
 673
 674   /* Since we internally use the complete set of FTW_* values we need
 675      to reduce the value range before calling a `ftw' callback.  */
 676   data.cvt_arr = is_nftw ? nftw_arr : ftw_arr;
 677
 678   /* No object known so far.  */
 679   data.known_objects = NULL;
 680
 681   /* Now go to the directory containing the initial file/directory.  */
 682   if (flags & FTW_CHDIR)
 683     {
 684       /* We have to be able to go back to the current working
 685          directory.  The best way to do this is to use a file
 686          descriptor.  */
 687       cwdfd = __open (".", O_RDONLY | O_DIRECTORY);
 688       if (cwdfd == -1)
 689         {
 690           /* Try getting the directory name.  This can be needed if
 691              the current directory is executable but not readable.  */
 692           if (errno == EACCES)
 693             /* GNU extension ahead.  */
 694             cwd =  __getcwd (NULL, 0);
 695
 696           if (cwd == NULL)
 697             goto out_fail;
 698         }
 699       else if (data.maxdir > 1)
 700         /* Account for the file descriptor we use here.  */
 701         --data.maxdir;
 702
 703       if (data.ftw.base > 0)
 704         {
 705           /* Change to the directory the file is in.  In data.dirbuf
 706              we have a writable copy of the file name.  Just NUL
 707              terminate it for now and change the directory.  */
 708           if (data.ftw.base == 1)
 709             /* I.e., the file is in the root directory.  */
 710             result = __chdir ("/");
 711           else
 712             {
 713               char ch = data.dirbuf[data.ftw.base - 1];
 714               data.dirbuf[data.ftw.base - 1] = '\0';
 715               result = __chdir (data.dirbuf);
 716               data.dirbuf[data.ftw.base - 1] = ch;
 717             }
 718         }
 719     }
 720
 721   /* Get stat info for start directory.  */
 722   if (result == 0)
 723     {
 724       const char *name = ((data.flags & FTW_CHDIR)
 725                           ? data.dirbuf + data.ftw.base
 726                           : data.dirbuf);
 727
 728       if (((flags & FTW_PHYS)
 729            ? LXSTAT (_STAT_VER, name, &st)
 730            : XSTAT (_STAT_VER, name, &st)) < 0)
 731         {
 732           if (!(flags & FTW_PHYS)
 733               && errno == ENOENT
 734               && LXSTAT (_STAT_VER, name, &st) == 0
 735               && S_ISLNK (st.st_mode))
 736             result = (*data.func) (data.dirbuf, &st, data.cvt_arr[FTW_SLN],
 737                                    &data.ftw);
 738           else
 739             /* No need to call the callback since we cannot say anything
 740                about the object.  */
 741             result = -1;
 742         }
 743       else
 744         {
 745           if (S_ISDIR (st.st_mode))
 746             {
 747               /* Remember the device of the initial directory in case
 748                  FTW_MOUNT is given.  */
 749               data.dev = st.st_dev;
 750
 751               /* We know this directory now.  */
 752               if (!(flags & FTW_PHYS))
 753                 result = add_object (&data, &st);
 754
 755               if (result == 0)
 756                 result = ftw_dir (&data, &st, NULL);
 757             }
 758           else
 759             {
 760               int flag = S_ISLNK (st.st_mode) ? FTW_SL : FTW_F;
 761
 762               result = (*data.func) (data.dirbuf, &st, data.cvt_arr[flag],
 763                                      &data.ftw);
 764             }
 765         }
 766
 767       if ((flags & FTW_ACTIONRETVAL)
 768           && (result == FTW_SKIP_SUBTREE || result == FTW_SKIP_SIBLINGS))
 769         result = 0;
 770     }
 771
 772   /* Return to the start directory (if necessary).  */
 773   if (cwdfd != -1)
 774     {
 775       int save_err = errno;
 776       __fchdir (cwdfd);
 777       __set_errno (save_err);
 778     }
 779   else if (cwd != NULL)
 780     {
 781       int save_err = errno;
 782       __chdir (cwd);
 783       free (cwd);
 784       __set_errno (save_err);
 785     }
 786
 787   /* Free all memory.  */
 788  out_fail:
 789   save_err = errno;
 790   __tdestroy (data.known_objects, free);
 791   free (data.dirbuf);
 792   __set_errno (save_err);
 793
 794   return result;
 795 }
 796
 797
 798
 799 /* Entry points.  */
 800
 801 int
 802 FTW_NAME (path, func, descriptors)
 803      const char *path;
 804      FTW_FUNC_T func;
 805      int descriptors;
 806 {
 807   return ftw_startup (path, 0, func, descriptors, 0);
 808 }
 809
 810 #ifndef _LIBC
 811 int
 812 NFTW_NAME (path, func, descriptors, flags)
 813      const char *path;
 814      NFTW_FUNC_T func;
 815      int descriptors;
 816      int flags;
 817 {
 818   return ftw_startup (path, 1, func, descriptors, flags);
 819 }
 820 #else
 821
 822 # include <shlib-compat.h>
 823
 824 int NFTW_NEW_NAME (const char *, NFTW_FUNC_T, int, int);
 825
 826 int
 827 NFTW_NEW_NAME (path, func, descriptors, flags)
 828      const char *path;
 829      NFTW_FUNC_T func;
 830      int descriptors;
 831      int flags;
 832 {
 833   if (flags
 834       & ~(FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH | FTW_ACTIONRETVAL))
 835     {
 836       __set_errno (EINVAL);
 837       return -1;
 838     }
 839   return ftw_startup (path, 1, func, descriptors, flags);
 840 }
 841
 842 versioned_symbol (libc, NFTW_NEW_NAME, NFTW_NAME, GLIBC_2_3_3);
 843
 844 # if SHLIB_COMPAT(libc, GLIBC_2_1, GLIBC_2_3_3)
 845
 846 /* Older nftw* version just ignored all unknown flags.  */
 847
 848 int NFTW_OLD_NAME (const char *, NFTW_FUNC_T, int, int);
 849
 850 int
 851 attribute_compat_text_section
 852 NFTW_OLD_NAME (path, func, descriptors, flags)
 853      const char *path;
 854      NFTW_FUNC_T func;
 855      int descriptors;
 856      int flags;
 857 {
 858   flags &= (FTW_PHYS | FTW_MOUNT | FTW_CHDIR | FTW_DEPTH);
 859   return ftw_startup (path, 1, func, descriptors, flags);
 860 }
 861
 862 compat_symbol (libc, NFTW_OLD_NAME, NFTW_NAME, GLIBC_2_1);
 863 # endif
 864 #endif