posix/glob.c

   1 /* Copyright (C) 1991-2016 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, see
  16    <http://www.gnu.org/licenses/>.  */
  17
  18 #ifdef  HAVE_CONFIG_H
  19 # include <config.h>
  20 #endif
  21
  22 #include <glob.h>
  23
  24 #include <errno.h>
  25 #include <sys/types.h>
  26 #include <sys/stat.h>
  27 #include <stddef.h>
  28
  29 /* Outcomment the following line for production quality code.  */
  30 /* #define NDEBUG 1 */
  31 #include <assert.h>
  32
  33 #include <stdio.h>              /* Needed on stupid SunOS for assert.  */
  34
  35 #if !defined _LIBC || !defined GLOB_ONLY_P
  36 #if defined HAVE_UNISTD_H || defined _LIBC
  37 # include <unistd.h>
  38 # ifndef POSIX
  39 #  ifdef _POSIX_VERSION
  40 #   define POSIX
  41 #  endif
  42 # endif
  43 #endif
  44
  45 #include <pwd.h>
  46
  47 #if defined HAVE_STDINT_H || defined _LIBC
  48 # include <stdint.h>
  49 #elif !defined UINTPTR_MAX
  50 # define UINTPTR_MAX (~((size_t) 0))
  51 #endif
  52
  53 #include <errno.h>
  54 #ifndef __set_errno
  55 # define __set_errno(val) errno = (val)
  56 #endif
  57
  58 #if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__
  59 # include <dirent.h>
  60 # define NAMLEN(dirent) strlen((dirent)->d_name)
  61 #else
  62 # define dirent direct
  63 # define NAMLEN(dirent) (dirent)->d_namlen
  64 # ifdef HAVE_SYS_NDIR_H
  65 #  include <sys/ndir.h>
  66 # endif
  67 # ifdef HAVE_SYS_DIR_H
  68 #  include <sys/dir.h>
  69 # endif
  70 # ifdef HAVE_NDIR_H
  71 #  include <ndir.h>
  72 # endif
  73 # ifdef HAVE_VMSDIR_H
  74 #  include "vmsdir.h"
  75 # endif /* HAVE_VMSDIR_H */
  76 #endif
  77
  78
  79 /* In GNU systems, <dirent.h> defines this macro for us.  */
  80 #ifdef _D_NAMLEN
  81 # undef NAMLEN
  82 # define NAMLEN(d) _D_NAMLEN(d)
  83 #endif
  84
  85 /* When used in the GNU libc the symbol _DIRENT_HAVE_D_TYPE is available
  86    if the `d_type' member for `struct dirent' is available.
  87    HAVE_STRUCT_DIRENT_D_TYPE plays the same role in GNULIB.  */
  88 #if defined _DIRENT_HAVE_D_TYPE || defined HAVE_STRUCT_DIRENT_D_TYPE
  89 /* True if the directory entry D must be of type T.  */
  90 # define DIRENT_MUST_BE(d, t)   ((d)->d_type == (t))
  91
  92 /* True if the directory entry D might be a symbolic link.  */
  93 # define DIRENT_MIGHT_BE_SYMLINK(d) \
  94     ((d)->d_type == DT_UNKNOWN || (d)->d_type == DT_LNK)
  95
  96 /* True if the directory entry D might be a directory.  */
  97 # define DIRENT_MIGHT_BE_DIR(d)  \
  98     ((d)->d_type == DT_DIR || DIRENT_MIGHT_BE_SYMLINK (d))
  99
 100 #else /* !HAVE_D_TYPE */
 101 # define DIRENT_MUST_BE(d, t)           false
 102 # define DIRENT_MIGHT_BE_SYMLINK(d)     true
 103 # define DIRENT_MIGHT_BE_DIR(d)         true
 104 #endif /* HAVE_D_TYPE */
 105
 106 /* If the system has the `struct dirent64' type we use it internally.  */
 107 #if defined _LIBC && !defined COMPILE_GLOB64
 108 # if defined HAVE_DIRENT_H || defined __GNU_LIBRARY__
 109 #  define CONVERT_D_NAMLEN(d64, d32)
 110 # else
 111 #  define CONVERT_D_NAMLEN(d64, d32) \
 112   (d64)->d_namlen = (d32)->d_namlen;
 113 # endif
 114
 115 # if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
 116 #  define CONVERT_D_INO(d64, d32)
 117 # else
 118 #  define CONVERT_D_INO(d64, d32) \
 119   (d64)->d_ino = (d32)->d_ino;
 120 # endif
 121
 122 # ifdef _DIRENT_HAVE_D_TYPE
 123 #  define CONVERT_D_TYPE(d64, d32) \
 124   (d64)->d_type = (d32)->d_type;
 125 # else
 126 #  define CONVERT_D_TYPE(d64, d32)
 127 # endif
 128
 129 # define CONVERT_DIRENT_DIRENT64(d64, d32) \
 130   memcpy ((d64)->d_name, (d32)->d_name, NAMLEN (d32) + 1);                    \
 131   CONVERT_D_NAMLEN (d64, d32)                                                 \
 132   CONVERT_D_INO (d64, d32)                                                    \
 133   CONVERT_D_TYPE (d64, d32)
 134 #endif
 135
 136
 137 #if (defined POSIX || defined WINDOWS32) && !defined __GNU_LIBRARY__
 138 /* Posix does not require that the d_ino field be present, and some
 139    systems do not provide it. */
 140 # define REAL_DIR_ENTRY(dp) 1
 141 #else
 142 # define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
 143 #endif /* POSIX */
 144
 145 #include <stdlib.h>
 146 #include <string.h>
 147
 148 /* NAME_MAX is usually defined in <dirent.h> or <limits.h>.  */
 149 #include <limits.h>
 150 #ifndef NAME_MAX
 151 # define NAME_MAX (sizeof (((struct dirent *) 0)->d_name))
 152 #endif
 153
 154 #include <alloca.h>
 155
 156 #ifdef _LIBC
 157 # undef strdup
 158 # define strdup(str) __strdup (str)
 159 # define sysconf(id) __sysconf (id)
 160 # define closedir(dir) __closedir (dir)
 161 # define opendir(name) __opendir (name)
 162 # define readdir(str) __readdir64 (str)
 163 # define getpwnam_r(name, bufp, buf, len, res) \
 164    __getpwnam_r (name, bufp, buf, len, res)
 165 # ifndef __stat64
 166 #  define __stat64(fname, buf) __xstat64 (_STAT_VER, fname, buf)
 167 # endif
 168 # define struct_stat64          struct stat64
 169 #else /* !_LIBC */
 170 # include "getlogin_r.h"
 171 # include "mempcpy.h"
 172 # include "stat-macros.h"
 173 # include "strdup.h"
 174 # define __stat64(fname, buf)   stat (fname, buf)
 175 # define struct_stat64          struct stat
 176 # define __stat(fname, buf)     stat (fname, buf)
 177 # define __alloca               alloca
 178 # define __readdir              readdir
 179 # define __readdir64            readdir64
 180 # define __glob_pattern_p       glob_pattern_p
 181 #endif /* _LIBC */
 182
 183 #include <fnmatch.h>
 184
 185 #ifdef _SC_GETPW_R_SIZE_MAX
 186 # define GETPW_R_SIZE_MAX()     sysconf (_SC_GETPW_R_SIZE_MAX)
 187 #else
 188 # define GETPW_R_SIZE_MAX()     (-1)
 189 #endif
 190 #ifdef _SC_LOGIN_NAME_MAX
 191 # define GET_LOGIN_NAME_MAX()   sysconf (_SC_LOGIN_NAME_MAX)
 192 #else
 193 # define GET_LOGIN_NAME_MAX()   (-1)
 194 #endif
 195 \f
 196 static const char *next_brace_sub (const char *begin, int flags) __THROWNL;
 197
 198 #endif /* !defined _LIBC || !defined GLOB_ONLY_P */
 199
 200 #ifndef attribute_hidden
 201 # define attribute_hidden
 202 #endif
 203
 204 static int glob_in_dir (const char *pattern, const char *directory,
 205                         int flags, int (*errfunc) (const char *, int),
 206                         glob_t *pglob, size_t alloca_used);
 207 extern int __glob_pattern_type (const char *pattern, int quote)
 208     attribute_hidden;
 209
 210 #if !defined _LIBC || !defined GLOB_ONLY_P
 211 static int prefix_array (const char *prefix, char **array, size_t n) __THROWNL;
 212 static int collated_compare (const void *, const void *) __THROWNL;
 213
 214
 215 /* Find the end of the sub-pattern in a brace expression.  */
 216 static const char *
 217 next_brace_sub (const char *cp, int flags)
 218 {
 219   size_t depth = 0;
 220   while (*cp != '\0')
 221     if ((flags & GLOB_NOESCAPE) == 0 && *cp == '\\')
 222       {
 223         if (*++cp == '\0')
 224           break;
 225         ++cp;
 226       }
 227     else
 228       {
 229         if ((*cp == '}' && depth-- == 0) || (*cp == ',' && depth == 0))
 230           break;
 231
 232         if (*cp++ == '{')
 233           depth++;
 234       }
 235
 236   return *cp != '\0' ? cp : NULL;
 237 }
 238
 239 #endif /* !defined _LIBC || !defined GLOB_ONLY_P */
 240
 241 /* Do glob searching for PATTERN, placing results in PGLOB.
 242    The bits defined above may be set in FLAGS.
 243    If a directory cannot be opened or read and ERRFUNC is not nil,
 244    it is called with the pathname that caused the error, and the
 245    `errno' value from the failing call; if it returns non-zero
 246    `glob' returns GLOB_ABORTED; if it returns zero, the error is ignored.
 247    If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
 248    Otherwise, `glob' returns zero.  */
 249 int
 250 #ifdef GLOB_ATTRIBUTE
 251 GLOB_ATTRIBUTE
 252 #endif
 253 glob (const char *pattern, int flags, int (*errfunc) (const char *, int),
 254       glob_t *pglob)
 255 {
 256   const char *filename;
 257   char *dirname = NULL;
 258   size_t dirlen;
 259   int status;
 260   size_t oldcount;
 261   int meta;
 262   int dirname_modified;
 263   int malloc_dirname = 0;
 264   glob_t dirs;
 265   int retval = 0;
 266 #ifdef _LIBC
 267   size_t alloca_used = 0;
 268 #endif
 269
 270   if (pattern == NULL || pglob == NULL || (flags & ~__GLOB_FLAGS) != 0)
 271     {
 272       __set_errno (EINVAL);
 273       return -1;
 274     }
 275
 276   /* POSIX requires all slashes to be matched.  This means that with
 277      a trailing slash we must match only directories.  */
 278   if (pattern[0] && pattern[strlen (pattern) - 1] == '/')
 279     flags |= GLOB_ONLYDIR;
 280
 281   if (!(flags & GLOB_DOOFFS))
 282     /* Have to do this so `globfree' knows where to start freeing.  It
 283        also makes all the code that uses gl_offs simpler. */
 284     pglob->gl_offs = 0;
 285
 286   if (flags & GLOB_BRACE)
 287     {
 288       const char *begin;
 289
 290       if (flags & GLOB_NOESCAPE)
 291         begin = strchr (pattern, '{');
 292       else
 293         {
 294           begin = pattern;
 295           while (1)
 296             {
 297               if (*begin == '\0')
 298                 {
 299                   begin = NULL;
 300                   break;
 301                 }
 302
 303               if (*begin == '\\' && begin[1] != '\0')
 304                 ++begin;
 305               else if (*begin == '{')
 306                 break;
 307
 308               ++begin;
 309             }
 310         }
 311
 312       if (begin != NULL)
 313         {
 314           /* Allocate working buffer large enough for our work.  Note that
 315             we have at least an opening and closing brace.  */
 316           size_t firstc;
 317           char *alt_start;
 318           const char *p;
 319           const char *next;
 320           const char *rest;
 321           size_t rest_len;
 322           char *onealt;
 323           size_t pattern_len = strlen (pattern) - 1;
 324 #ifdef _LIBC
 325           int alloca_onealt = __libc_use_alloca (alloca_used + pattern_len);
 326           if (alloca_onealt)
 327             onealt = alloca_account (pattern_len, alloca_used);
 328           else
 329 #endif
 330             {
 331               onealt = (char *) malloc (pattern_len);
 332               if (onealt == NULL)
 333                 {
 334                   if (!(flags & GLOB_APPEND))
 335                     {
 336                       pglob->gl_pathc = 0;
 337                       pglob->gl_pathv = NULL;
 338                     }
 339                   return GLOB_NOSPACE;
 340                 }
 341             }
 342
 343           /* We know the prefix for all sub-patterns.  */
 344           alt_start = mempcpy (onealt, pattern, begin - pattern);
 345
 346           /* Find the first sub-pattern and at the same time find the
 347              rest after the closing brace.  */
 348           next = next_brace_sub (begin + 1, flags);
 349           if (next == NULL)
 350             {
 351               /* It is an illegal expression.  */
 352             illegal_brace:
 353 #ifdef _LIBC
 354               if (__glibc_unlikely (!alloca_onealt))
 355 #endif
 356                 free (onealt);
 357               return glob (pattern, flags & ~GLOB_BRACE, errfunc, pglob);
 358             }
 359
 360           /* Now find the end of the whole brace expression.  */
 361           rest = next;
 362           while (*rest != '}')
 363             {
 364               rest = next_brace_sub (rest + 1, flags);
 365               if (rest == NULL)
 366                 /* It is an illegal expression.  */
 367                 goto illegal_brace;
 368             }
 369           /* Please note that we now can be sure the brace expression
 370              is well-formed.  */
 371           rest_len = strlen (++rest) + 1;
 372
 373           /* We have a brace expression.  BEGIN points to the opening {,
 374              NEXT points past the terminator of the first element, and END
 375              points past the final }.  We will accumulate result names from
 376              recursive runs for each brace alternative in the buffer using
 377              GLOB_APPEND.  */
 378
 379           if (!(flags & GLOB_APPEND))
 380             {
 381               /* This call is to set a new vector, so clear out the
 382                  vector so we can append to it.  */
 383               pglob->gl_pathc = 0;
 384               pglob->gl_pathv = NULL;
 385             }
 386           firstc = pglob->gl_pathc;
 387
 388           p = begin + 1;
 389           while (1)
 390             {
 391               int result;
 392
 393               /* Construct the new glob expression.  */
 394               mempcpy (mempcpy (alt_start, p, next - p), rest, rest_len);
 395
 396               result = glob (onealt,
 397                              ((flags & ~(GLOB_NOCHECK | GLOB_NOMAGIC))
 398                               | GLOB_APPEND), errfunc, pglob);
 399
 400               /* If we got an error, return it.  */
 401               if (result && result != GLOB_NOMATCH)
 402                 {
 403 #ifdef _LIBC
 404                   if (__glibc_unlikely (!alloca_onealt))
 405 #endif
 406                     free (onealt);
 407                   if (!(flags & GLOB_APPEND))
 408                     {
 409                       globfree (pglob);
 410                       pglob->gl_pathc = 0;
 411                     }
 412                   return result;
 413                 }
 414
 415               if (*next == '}')
 416                 /* We saw the last entry.  */
 417                 break;
 418
 419               p = next + 1;
 420               next = next_brace_sub (p, flags);
 421               assert (next != NULL);
 422             }
 423
 424 #ifdef _LIBC
 425           if (__glibc_unlikely (!alloca_onealt))
 426 #endif
 427             free (onealt);
 428
 429           if (pglob->gl_pathc != firstc)
 430             /* We found some entries.  */
 431             return 0;
 432           else if (!(flags & (GLOB_NOCHECK|GLOB_NOMAGIC)))
 433             return GLOB_NOMATCH;
 434         }
 435     }
 436
 437   if (!(flags & GLOB_APPEND))
 438     {
 439       pglob->gl_pathc = 0;
 440       if (!(flags & GLOB_DOOFFS))
 441         pglob->gl_pathv = NULL;
 442       else
 443         {
 444           size_t i;
 445
 446           if (pglob->gl_offs >= ~((size_t) 0) / sizeof (char *))
 447             return GLOB_NOSPACE;
 448
 449           pglob->gl_pathv = (char **) malloc ((pglob->gl_offs + 1)
 450                                               * sizeof (char *));
 451           if (pglob->gl_pathv == NULL)
 452             return GLOB_NOSPACE;
 453
 454           for (i = 0; i <= pglob->gl_offs; ++i)
 455             pglob->gl_pathv[i] = NULL;
 456         }
 457     }
 458
 459   oldcount = pglob->gl_pathc + pglob->gl_offs;
 460
 461   /* Find the filename.  */
 462   filename = strrchr (pattern, '/');
 463 #if defined __MSDOS__ || defined WINDOWS32
 464   /* The case of "d:pattern".  Since `:' is not allowed in
 465      file names, we can safely assume that wherever it
 466      happens in pattern, it signals the filename part.  This
 467      is so we could some day support patterns like "[a-z]:foo".  */
 468   if (filename == NULL)
 469     filename = strchr (pattern, ':');
 470 #endif /* __MSDOS__ || WINDOWS32 */
 471   dirname_modified = 0;
 472   if (filename == NULL)
 473     {
 474       /* This can mean two things: a simple name or "~name".  The latter
 475          case is nothing but a notation for a directory.  */
 476       if ((flags & (GLOB_TILDE|GLOB_TILDE_CHECK)) && pattern[0] == '~')
 477         {
 478           dirname = (char *) pattern;
 479           dirlen = strlen (pattern);
 480
 481           /* Set FILENAME to NULL as a special flag.  This is ugly but
 482              other solutions would require much more code.  We test for
 483              this special case below.  */
 484           filename = NULL;
 485         }
 486       else
 487         {
 488           if (__glibc_unlikely (pattern[0] == '\0'))
 489             {
 490               dirs.gl_pathv = NULL;
 491               goto no_matches;
 492             }
 493
 494           filename = pattern;
 495 #ifdef _AMIGA
 496           dirname = (char *) "";
 497 #else
 498           dirname = (char *) ".";
 499 #endif
 500           dirlen = 0;
 501         }
 502     }
 503   else if (filename == pattern
 504            || (filename == pattern + 1 && pattern[0] == '\\'
 505                && (flags & GLOB_NOESCAPE) == 0))
 506     {
 507       /* "/pattern" or "\\/pattern".  */
 508       dirname = (char *) "/";
 509       dirlen = 1;
 510       ++filename;
 511     }
 512   else
 513     {
 514       char *newp;
 515       dirlen = filename - pattern;
 516 #if defined __MSDOS__ || defined WINDOWS32
 517       if (*filename == ':'
 518           || (filename > pattern + 1 && filename[-1] == ':'))
 519         {
 520           char *drive_spec;
 521
 522           ++dirlen;
 523           drive_spec = (char *) __alloca (dirlen + 1);
 524           *((char *) mempcpy (drive_spec, pattern, dirlen)) = '\0';
 525           /* For now, disallow wildcards in the drive spec, to
 526              prevent infinite recursion in glob.  */
 527           if (__glob_pattern_p (drive_spec, !(flags & GLOB_NOESCAPE)))
 528             return GLOB_NOMATCH;
 529           /* If this is "d:pattern", we need to copy `:' to DIRNAME
 530              as well.  If it's "d:/pattern", don't remove the slash
 531              from "d:/", since "d:" and "d:/" are not the same.*/
 532         }
 533 #endif
 534 #ifdef _LIBC
 535       if (__libc_use_alloca (alloca_used + dirlen + 1))
 536         newp = alloca_account (dirlen + 1, alloca_used);
 537       else
 538 #endif
 539         {
 540           newp = malloc (dirlen + 1);
 541           if (newp == NULL)
 542             return GLOB_NOSPACE;
 543           malloc_dirname = 1;
 544         }
 545       *((char *) mempcpy (newp, pattern, dirlen)) = '\0';
 546       dirname = newp;
 547       ++filename;
 548
 549       if (filename[0] == '\0'
 550 #if defined __MSDOS__ || defined WINDOWS32
 551           && dirname[dirlen - 1] != ':'
 552           && (dirlen < 3 || dirname[dirlen - 2] != ':'
 553               || dirname[dirlen - 1] != '/')
 554 #endif
 555           && dirlen > 1)
 556         /* "pattern/".  Expand "pattern", appending slashes.  */
 557         {
 558           int orig_flags = flags;
 559           if (!(flags & GLOB_NOESCAPE) && dirname[dirlen - 1] == '\\')
 560             {
 561               /* "pattern\\/".  Remove the final backslash if it hasn't
 562                  been quoted.  */
 563               char *p = (char *) &dirname[dirlen - 1];
 564
 565               while (p > dirname && p[-1] == '\\') --p;
 566               if ((&dirname[dirlen] - p) & 1)
 567                 {
 568                   *(char *) &dirname[--dirlen] = '\0';
 569                   flags &= ~(GLOB_NOCHECK | GLOB_NOMAGIC);
 570                 }
 571             }
 572           int val = glob (dirname, flags | GLOB_MARK, errfunc, pglob);
 573           if (val == 0)
 574             pglob->gl_flags = ((pglob->gl_flags & ~GLOB_MARK)
 575                                | (flags & GLOB_MARK));
 576           else if (val == GLOB_NOMATCH && flags != orig_flags)
 577             {
 578               /* Make sure globfree (&dirs); is a nop.  */
 579               dirs.gl_pathv = NULL;
 580               flags = orig_flags;
 581               oldcount = pglob->gl_pathc + pglob->gl_offs;
 582               goto no_matches;
 583             }
 584           retval = val;
 585           goto out;
 586         }
 587     }
 588
 589 #ifndef VMS
 590   if ((flags & (GLOB_TILDE|GLOB_TILDE_CHECK)) && dirname[0] == '~')
 591     {
 592       if (dirname[1] == '\0' || dirname[1] == '/'
 593           || (!(flags & GLOB_NOESCAPE) && dirname[1] == '\\'
 594               && (dirname[2] == '\0' || dirname[2] == '/')))
 595         {
 596           /* Look up home directory.  */
 597           char *home_dir = getenv ("HOME");
 598           int malloc_home_dir = 0;
 599 # ifdef _AMIGA
 600           if (home_dir == NULL || home_dir[0] == '\0')
 601             home_dir = "SYS:";
 602 # else
 603 #  ifdef WINDOWS32
 604           if (home_dir == NULL || home_dir[0] == '\0')
 605             home_dir = "c:/users/default"; /* poor default */
 606 #  else
 607           if (home_dir == NULL || home_dir[0] == '\0')
 608             {
 609               int success;
 610               char *name;
 611               size_t buflen = GET_LOGIN_NAME_MAX () + 1;
 612
 613               if (buflen == 0)
 614                 /* `sysconf' does not support _SC_LOGIN_NAME_MAX.  Try
 615                    a moderate value.  */
 616                 buflen = 20;
 617               name = alloca_account (buflen, alloca_used);
 618
 619               success = __getlogin_r (name, buflen) == 0;
 620               if (success)
 621                 {
 622                   struct passwd *p;
 623 #   if defined HAVE_GETPWNAM_R || defined _LIBC
 624                   long int pwbuflen = GETPW_R_SIZE_MAX ();
 625                   char *pwtmpbuf;
 626                   struct passwd pwbuf;
 627                   int malloc_pwtmpbuf = 0;
 628                   int save = errno;
 629
 630 #    ifndef _LIBC
 631                   if (pwbuflen == -1)
 632                     /* `sysconf' does not support _SC_GETPW_R_SIZE_MAX.
 633                        Try a moderate value.  */
 634                     pwbuflen = 1024;
 635 #    endif
 636                   if (__libc_use_alloca (alloca_used + pwbuflen))
 637                     pwtmpbuf = alloca_account (pwbuflen, alloca_used);
 638                   else
 639                     {
 640                       pwtmpbuf = malloc (pwbuflen);
 641                       if (pwtmpbuf == NULL)
 642                         {
 643                           retval = GLOB_NOSPACE;
 644                           goto out;
 645                         }
 646                       malloc_pwtmpbuf = 1;
 647                     }
 648
 649                   while (getpwnam_r (name, &pwbuf, pwtmpbuf, pwbuflen, &p)
 650                          != 0)
 651                     {
 652                       if (errno != ERANGE)
 653                         {
 654                           p = NULL;
 655                           break;
 656                         }
 657
 658                       if (!malloc_pwtmpbuf
 659                           && __libc_use_alloca (alloca_used
 660                                                 + 2 * pwbuflen))
 661                         pwtmpbuf = extend_alloca_account (pwtmpbuf, pwbuflen,
 662                                                           2 * pwbuflen,
 663                                                           alloca_used);
 664                       else
 665                         {
 666                           char *newp = realloc (malloc_pwtmpbuf
 667                                                 ? pwtmpbuf : NULL,
 668                                                 2 * pwbuflen);
 669                           if (newp == NULL)
 670                             {
 671                               if (__glibc_unlikely (malloc_pwtmpbuf))
 672                                 free (pwtmpbuf);
 673                               retval = GLOB_NOSPACE;
 674                               goto out;
 675                             }
 676                           pwtmpbuf = newp;
 677                           pwbuflen = 2 * pwbuflen;
 678                           malloc_pwtmpbuf = 1;
 679                         }
 680                       __set_errno (save);
 681                     }
 682 #   else
 683                   p = getpwnam (name);
 684 #   endif
 685                   if (p != NULL)
 686                     {
 687                       if (!malloc_pwtmpbuf)
 688                         home_dir = p->pw_dir;
 689                       else
 690                         {
 691                           size_t home_dir_len = strlen (p->pw_dir) + 1;
 692                           if (__libc_use_alloca (alloca_used + home_dir_len))
 693                             home_dir = alloca_account (home_dir_len,
 694                                                        alloca_used);
 695                           else
 696                             {
 697                               home_dir = malloc (home_dir_len);
 698                               if (home_dir == NULL)
 699                                 {
 700                                   free (pwtmpbuf);
 701                                   retval = GLOB_NOSPACE;
 702                                   goto out;
 703                                 }
 704                               malloc_home_dir = 1;
 705                             }
 706                           memcpy (home_dir, p->pw_dir, home_dir_len);
 707
 708                           free (pwtmpbuf);
 709                         }
 710                     }
 711                 }
 712             }
 713           if (home_dir == NULL || home_dir[0] == '\0')
 714             {
 715               if (flags & GLOB_TILDE_CHECK)
 716                 {
 717                   if (__glibc_unlikely (malloc_home_dir))
 718                     free (home_dir);
 719                   retval = GLOB_NOMATCH;
 720                   goto out;
 721                 }
 722               else
 723                 home_dir = (char *) "~"; /* No luck.  */
 724             }
 725 #  endif /* WINDOWS32 */
 726 # endif
 727           /* Now construct the full directory.  */
 728           if (dirname[1] == '\0')
 729             {
 730               if (__glibc_unlikely (malloc_dirname))
 731                 free (dirname);
 732
 733               dirname = home_dir;
 734               dirlen = strlen (dirname);
 735               malloc_dirname = malloc_home_dir;
 736             }
 737           else
 738             {
 739               char *newp;
 740               size_t home_len = strlen (home_dir);
 741               int use_alloca = __libc_use_alloca (alloca_used
 742                                                   + home_len + dirlen);
 743               if (use_alloca)
 744                 newp = alloca_account (home_len + dirlen, alloca_used);
 745               else
 746                 {
 747                   newp = malloc (home_len + dirlen);
 748                   if (newp == NULL)
 749                     {
 750                       if (__glibc_unlikely (malloc_home_dir))
 751                         free (home_dir);
 752                       retval = GLOB_NOSPACE;
 753                       goto out;
 754                     }
 755                 }
 756
 757               mempcpy (mempcpy (newp, home_dir, home_len),
 758                        &dirname[1], dirlen);
 759
 760               if (__glibc_unlikely (malloc_dirname))
 761                 free (dirname);
 762
 763               dirname = newp;
 764               dirlen += home_len - 1;
 765               malloc_dirname = !use_alloca;
 766             }
 767           dirname_modified = 1;
 768         }
 769 # if !defined _AMIGA && !defined WINDOWS32
 770       else
 771         {
 772           char *end_name = strchr (dirname, '/');
 773           char *user_name;
 774           int malloc_user_name = 0;
 775           char *unescape = NULL;
 776
 777           if (!(flags & GLOB_NOESCAPE))
 778             {
 779               if (end_name == NULL)
 780                 {
 781                   unescape = strchr (dirname, '\\');
 782                   if (unescape)
 783                     end_name = strchr (unescape, '\0');
 784                 }
 785               else
 786                 unescape = memchr (dirname, '\\', end_name - dirname);
 787             }
 788           if (end_name == NULL)
 789             user_name = dirname + 1;
 790           else
 791             {
 792               char *newp;
 793               if (__libc_use_alloca (alloca_used + (end_name - dirname)))
 794                 newp = alloca_account (end_name - dirname, alloca_used);
 795               else
 796                 {
 797                   newp = malloc (end_name - dirname);
 798                   if (newp == NULL)
 799                     {
 800                       retval = GLOB_NOSPACE;
 801                       goto out;
 802                     }
 803                   malloc_user_name = 1;
 804                 }
 805               if (unescape != NULL)
 806                 {
 807                   char *p = mempcpy (newp, dirname + 1,
 808                                      unescape - dirname - 1);
 809                   char *q = unescape;
 810                   while (*q != '\0')
 811                     {
 812                       if (*q == '\\')
 813                         {
 814                           if (q[1] == '\0')
 815                             {
 816                               /* "~fo\\o\\" unescape to user_name "foo\\",
 817                                  but "~fo\\o\\/" unescape to user_name
 818                                  "foo".  */
 819                               if (filename == NULL)
 820                                 *p++ = '\\';
 821                               break;
 822                             }
 823                           ++q;
 824                         }
 825                       *p++ = *q++;
 826                     }
 827                   *p = '\0';
 828                 }
 829               else
 830                 *((char *) mempcpy (newp, dirname + 1, end_name - dirname))
 831                   = '\0';
 832               user_name = newp;
 833             }
 834
 835           /* Look up specific user's home directory.  */
 836           {
 837             struct passwd *p;
 838 #  if defined HAVE_GETPWNAM_R || defined _LIBC
 839             long int buflen = GETPW_R_SIZE_MAX ();
 840             char *pwtmpbuf;
 841             int malloc_pwtmpbuf = 0;
 842             struct passwd pwbuf;
 843             int save = errno;
 844
 845 #   ifndef _LIBC
 846             if (buflen == -1)
 847               /* `sysconf' does not support _SC_GETPW_R_SIZE_MAX.  Try a
 848                  moderate value.  */
 849               buflen = 1024;
 850 #   endif
 851             if (__libc_use_alloca (alloca_used + buflen))
 852               pwtmpbuf = alloca_account (buflen, alloca_used);
 853             else
 854               {
 855                 pwtmpbuf = malloc (buflen);
 856                 if (pwtmpbuf == NULL)
 857                   {
 858                   nomem_getpw:
 859                     if (__glibc_unlikely (malloc_user_name))
 860                       free (user_name);
 861                     retval = GLOB_NOSPACE;
 862                     goto out;
 863                   }
 864                 malloc_pwtmpbuf = 1;
 865               }
 866
 867             while (getpwnam_r (user_name, &pwbuf, pwtmpbuf, buflen, &p) != 0)
 868               {
 869                 if (errno != ERANGE)
 870                   {
 871                     p = NULL;
 872                     break;
 873                   }
 874                 if (!malloc_pwtmpbuf
 875                     && __libc_use_alloca (alloca_used + 2 * buflen))
 876                   pwtmpbuf = extend_alloca_account (pwtmpbuf, buflen,
 877                                                     2 * buflen, alloca_used);
 878                 else
 879                   {
 880                     char *newp = realloc (malloc_pwtmpbuf ? pwtmpbuf : NULL,
 881                                           2 * buflen);
 882                     if (newp == NULL)
 883                       {
 884                         if (__glibc_unlikely (malloc_pwtmpbuf))
 885                           free (pwtmpbuf);
 886                         goto nomem_getpw;
 887                       }
 888                     pwtmpbuf = newp;
 889                     malloc_pwtmpbuf = 1;
 890                   }
 891                 __set_errno (save);
 892               }
 893 #  else
 894             p = getpwnam (user_name);
 895 #  endif
 896
 897             if (__glibc_unlikely (malloc_user_name))
 898               free (user_name);
 899
 900             /* If we found a home directory use this.  */
 901             if (p != NULL)
 902               {
 903                 size_t home_len = strlen (p->pw_dir);
 904                 size_t rest_len = end_name == NULL ? 0 : strlen (end_name);
 905
 906                 if (__glibc_unlikely (malloc_dirname))
 907                   free (dirname);
 908                 malloc_dirname = 0;
 909
 910                 if (__libc_use_alloca (alloca_used + home_len + rest_len + 1))
 911                   dirname = alloca_account (home_len + rest_len + 1,
 912                                             alloca_used);
 913                 else
 914                   {
 915                     dirname = malloc (home_len + rest_len + 1);
 916                     if (dirname == NULL)
 917                       {
 918                         if (__glibc_unlikely (malloc_pwtmpbuf))
 919                           free (pwtmpbuf);
 920                         retval = GLOB_NOSPACE;
 921                         goto out;
 922                       }
 923                     malloc_dirname = 1;
 924                   }
 925                 *((char *) mempcpy (mempcpy (dirname, p->pw_dir, home_len),
 926                                     end_name, rest_len)) = '\0';
 927
 928                 dirlen = home_len + rest_len;
 929                 dirname_modified = 1;
 930
 931                 if (__glibc_unlikely (malloc_pwtmpbuf))
 932                   free (pwtmpbuf);
 933               }
 934             else
 935               {
 936                 if (__glibc_unlikely (malloc_pwtmpbuf))
 937                   free (pwtmpbuf);
 938
 939                 if (flags & GLOB_TILDE_CHECK)
 940                   /* We have to regard it as an error if we cannot find the
 941                      home directory.  */
 942                   return GLOB_NOMATCH;
 943               }
 944           }
 945         }
 946 # endif /* Not Amiga && not WINDOWS32.  */
 947     }
 948 #endif  /* Not VMS.  */
 949
 950   /* Now test whether we looked for "~" or "~NAME".  In this case we
 951      can give the answer now.  */
 952   if (filename == NULL)
 953     {
 954       struct stat st;
 955       struct_stat64 st64;
 956
 957       /* Return the directory if we don't check for error or if it exists.  */
 958       if ((flags & GLOB_NOCHECK)
 959           || (((__builtin_expect (flags & GLOB_ALTDIRFUNC, 0))
 960                ? ((*pglob->gl_stat) (dirname, &st) == 0
 961                   && S_ISDIR (st.st_mode))
 962                : (__stat64 (dirname, &st64) == 0 && S_ISDIR (st64.st_mode)))))
 963         {
 964           size_t newcount = pglob->gl_pathc + pglob->gl_offs;
 965           char **new_gl_pathv;
 966
 967           if (newcount > UINTPTR_MAX - (1 + 1)
 968               || newcount + 1 + 1 > ~((size_t) 0) / sizeof (char *))
 969             {
 970             nospace:
 971               free (pglob->gl_pathv);
 972               pglob->gl_pathv = NULL;
 973               pglob->gl_pathc = 0;
 974               return GLOB_NOSPACE;
 975             }
 976
 977           new_gl_pathv
 978             = (char **) realloc (pglob->gl_pathv,
 979                                  (newcount + 1 + 1) * sizeof (char *));
 980           if (new_gl_pathv == NULL)
 981             goto nospace;
 982           pglob->gl_pathv = new_gl_pathv;
 983
 984           if (flags & GLOB_MARK)
 985             {
 986               char *p;
 987               pglob->gl_pathv[newcount] = malloc (dirlen + 2);
 988               if (pglob->gl_pathv[newcount] == NULL)
 989                 goto nospace;
 990               p = mempcpy (pglob->gl_pathv[newcount], dirname, dirlen);
 991               p[0] = '/';
 992               p[1] = '\0';
 993             }
 994           else
 995             {
 996               pglob->gl_pathv[newcount] = strdup (dirname);
 997               if (pglob->gl_pathv[newcount] == NULL)
 998                 goto nospace;
 999             }
1000           pglob->gl_pathv[++newcount] = NULL;
1001           ++pglob->gl_pathc;
1002           pglob->gl_flags = flags;
1003
1004           return 0;
1005         }
1006
1007       /* Not found.  */
1008       return GLOB_NOMATCH;
1009     }
1010
1011   meta = __glob_pattern_type (dirname, !(flags & GLOB_NOESCAPE));
1012   /* meta is 1 if correct glob pattern containing metacharacters.
1013      If meta has bit (1 << 2) set, it means there was an unterminated
1014      [ which we handle the same, using fnmatch.  Broken unterminated
1015      pattern bracket expressions ought to be rare enough that it is
1016      not worth special casing them, fnmatch will do the right thing.  */
1017   if (meta & 5)
1018     {
1019       /* The directory name contains metacharacters, so we
1020          have to glob for the directory, and then glob for
1021          the pattern in each directory found.  */
1022       size_t i;
1023
1024       if (!(flags & GLOB_NOESCAPE) && dirlen > 0 && dirname[dirlen - 1] == '\\')
1025         {
1026           /* "foo\\/bar".  Remove the final backslash from dirname
1027              if it has not been quoted.  */
1028           char *p = (char *) &dirname[dirlen - 1];
1029
1030           while (p > dirname && p[-1] == '\\') --p;
1031           if ((&dirname[dirlen] - p) & 1)
1032             *(char *) &dirname[--dirlen] = '\0';
1033         }
1034
1035       if (__glibc_unlikely ((flags & GLOB_ALTDIRFUNC) != 0))
1036         {
1037           /* Use the alternative access functions also in the recursive
1038              call.  */
1039           dirs.gl_opendir = pglob->gl_opendir;
1040           dirs.gl_readdir = pglob->gl_readdir;
1041           dirs.gl_closedir = pglob->gl_closedir;
1042           dirs.gl_stat = pglob->gl_stat;
1043           dirs.gl_lstat = pglob->gl_lstat;
1044         }
1045
1046       status = glob (dirname,
1047                      ((flags & (GLOB_ERR | GLOB_NOESCAPE
1048                                 | GLOB_ALTDIRFUNC))
1049                       | GLOB_NOSORT | GLOB_ONLYDIR),
1050                      errfunc, &dirs);
1051       if (status != 0)
1052         {
1053           if ((flags & GLOB_NOCHECK) == 0 || status != GLOB_NOMATCH)
1054             return status;
1055           goto no_matches;
1056         }
1057
1058       /* We have successfully globbed the preceding directory name.
1059          For each name we found, call glob_in_dir on it and FILENAME,
1060          appending the results to PGLOB.  */
1061       for (i = 0; i < dirs.gl_pathc; ++i)
1062         {
1063           size_t old_pathc;
1064
1065 #ifdef  SHELL
1066           {
1067             /* Make globbing interruptible in the bash shell. */
1068             extern int interrupt_state;
1069
1070             if (interrupt_state)
1071               {
1072                 globfree (&dirs);
1073                 return GLOB_ABORTED;
1074               }
1075           }
1076 #endif /* SHELL.  */
1077
1078           old_pathc = pglob->gl_pathc;
1079           status = glob_in_dir (filename, dirs.gl_pathv[i],
1080                                 ((flags | GLOB_APPEND)
1081                                  & ~(GLOB_NOCHECK | GLOB_NOMAGIC)),
1082                                 errfunc, pglob, alloca_used);
1083           if (status == GLOB_NOMATCH)
1084             /* No matches in this directory.  Try the next.  */
1085             continue;
1086
1087           if (status != 0)
1088             {
1089               globfree (&dirs);
1090               globfree (pglob);
1091               pglob->gl_pathc = 0;
1092               return status;
1093             }
1094
1095           /* Stick the directory on the front of each name.  */
1096           if (prefix_array (dirs.gl_pathv[i],
1097                             &pglob->gl_pathv[old_pathc + pglob->gl_offs],
1098                             pglob->gl_pathc - old_pathc))
1099             {
1100               globfree (&dirs);
1101               globfree (pglob);
1102               pglob->gl_pathc = 0;
1103               return GLOB_NOSPACE;
1104             }
1105         }
1106
1107       flags |= GLOB_MAGCHAR;
1108
1109       /* We have ignored the GLOB_NOCHECK flag in the `glob_in_dir' calls.
1110          But if we have not found any matching entry and the GLOB_NOCHECK
1111          flag was set we must return the input pattern itself.  */
1112       if (pglob->gl_pathc + pglob->gl_offs == oldcount)
1113         {
1114         no_matches:
1115           /* No matches.  */
1116           if (flags & GLOB_NOCHECK)
1117             {
1118               size_t newcount = pglob->gl_pathc + pglob->gl_offs;
1119               char **new_gl_pathv;
1120
1121               if (newcount > UINTPTR_MAX - 2
1122                   || newcount + 2 > ~((size_t) 0) / sizeof (char *))
1123                 {
1124                 nospace2:
1125                   globfree (&dirs);
1126                   return GLOB_NOSPACE;
1127                 }
1128
1129               new_gl_pathv = (char **) realloc (pglob->gl_pathv,
1130                                                 (newcount + 2)
1131                                                 * sizeof (char *));
1132               if (new_gl_pathv == NULL)
1133                 goto nospace2;
1134               pglob->gl_pathv = new_gl_pathv;
1135
1136               pglob->gl_pathv[newcount] = __strdup (pattern);
1137               if (pglob->gl_pathv[newcount] == NULL)
1138                 {
1139                   globfree (&dirs);
1140                   globfree (pglob);
1141                   pglob->gl_pathc = 0;
1142                   return GLOB_NOSPACE;
1143                 }
1144
1145               ++pglob->gl_pathc;
1146               ++newcount;
1147
1148               pglob->gl_pathv[newcount] = NULL;
1149               pglob->gl_flags = flags;
1150             }
1151           else
1152             {
1153               globfree (&dirs);
1154               return GLOB_NOMATCH;
1155             }
1156         }
1157
1158       globfree (&dirs);
1159     }
1160   else
1161     {
1162       size_t old_pathc = pglob->gl_pathc;
1163       int orig_flags = flags;
1164
1165       if (meta & 2)
1166         {
1167           char *p = strchr (dirname, '\\'), *q;
1168           /* We need to unescape the dirname string.  It is certainly
1169              allocated by alloca, as otherwise filename would be NULL
1170              or dirname wouldn't contain backslashes.  */
1171           q = p;
1172           do
1173             {
1174               if (*p == '\\')
1175                 {
1176                   *q = *++p;
1177                   --dirlen;
1178                 }
1179               else
1180                 *q = *p;
1181               ++q;
1182             }
1183           while (*p++ != '\0');
1184           dirname_modified = 1;
1185         }
1186       if (dirname_modified)
1187         flags &= ~(GLOB_NOCHECK | GLOB_NOMAGIC);
1188       status = glob_in_dir (filename, dirname, flags, errfunc, pglob,
1189                             alloca_used);
1190       if (status != 0)
1191         {
1192           if (status == GLOB_NOMATCH && flags != orig_flags
1193               && pglob->gl_pathc + pglob->gl_offs == oldcount)
1194             {
1195               /* Make sure globfree (&dirs); is a nop.  */
1196               dirs.gl_pathv = NULL;
1197               flags = orig_flags;
1198               goto no_matches;
1199             }
1200           return status;
1201         }
1202
1203       if (dirlen > 0)
1204         {
1205           /* Stick the directory on the front of each name.  */
1206           if (prefix_array (dirname,
1207                             &pglob->gl_pathv[old_pathc + pglob->gl_offs],
1208                             pglob->gl_pathc - old_pathc))
1209             {
1210               globfree (pglob);
1211               pglob->gl_pathc = 0;
1212               return GLOB_NOSPACE;
1213             }
1214         }
1215     }
1216
1217   if (flags & GLOB_MARK)
1218     {
1219       /* Append slashes to directory names.  */
1220       size_t i;
1221       struct stat st;
1222       struct_stat64 st64;
1223
1224       for (i = oldcount; i < pglob->gl_pathc + pglob->gl_offs; ++i)
1225         if ((__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1226              ? ((*pglob->gl_stat) (pglob->gl_pathv[i], &st) == 0
1227                 && S_ISDIR (st.st_mode))
1228              : (__stat64 (pglob->gl_pathv[i], &st64) == 0
1229                 && S_ISDIR (st64.st_mode))))
1230           {
1231             size_t len = strlen (pglob->gl_pathv[i]) + 2;
1232             char *new = realloc (pglob->gl_pathv[i], len);
1233             if (new == NULL)
1234               {
1235                 globfree (pglob);
1236                 pglob->gl_pathc = 0;
1237                 return GLOB_NOSPACE;
1238               }
1239             strcpy (&new[len - 2], "/");
1240             pglob->gl_pathv[i] = new;
1241           }
1242     }
1243
1244   if (!(flags & GLOB_NOSORT))
1245     {
1246       /* Sort the vector.  */
1247       qsort (&pglob->gl_pathv[oldcount],
1248              pglob->gl_pathc + pglob->gl_offs - oldcount,
1249              sizeof (char *), collated_compare);
1250     }
1251
1252  out:
1253   if (__glibc_unlikely (malloc_dirname))
1254     free (dirname);
1255
1256   return retval;
1257 }
1258 #if defined _LIBC && !defined glob
1259 libc_hidden_def (glob)
1260 #endif
1261
1262
1263 #if !defined _LIBC || !defined GLOB_ONLY_P
1264
1265 /* Free storage allocated in PGLOB by a previous `glob' call.  */
1266 void
1267 globfree (glob_t *pglob)
1268 {
1269   if (pglob->gl_pathv != NULL)
1270     {
1271       size_t i;
1272       for (i = 0; i < pglob->gl_pathc; ++i)
1273         free (pglob->gl_pathv[pglob->gl_offs + i]);
1274       free (pglob->gl_pathv);
1275       pglob->gl_pathv = NULL;
1276     }
1277 }
1278 #if defined _LIBC && !defined globfree
1279 libc_hidden_def (globfree)
1280 #endif
1281
1282
1283 /* Do a collated comparison of A and B.  */
1284 static int
1285 collated_compare (const void *a, const void *b)
1286 {
1287   const char *const s1 = *(const char *const * const) a;
1288   const char *const s2 = *(const char *const * const) b;
1289
1290   if (s1 == s2)
1291     return 0;
1292   if (s1 == NULL)
1293     return 1;
1294   if (s2 == NULL)
1295     return -1;
1296   return strcoll (s1, s2);
1297 }
1298
1299
1300 /* Prepend DIRNAME to each of N members of ARRAY, replacing ARRAY's
1301    elements in place.  Return nonzero if out of memory, zero if successful.
1302    A slash is inserted between DIRNAME and each elt of ARRAY,
1303    unless DIRNAME is just "/".  Each old element of ARRAY is freed.  */
1304 static int
1305 prefix_array (const char *dirname, char **array, size_t n)
1306 {
1307   size_t i;
1308   size_t dirlen = strlen (dirname);
1309 #if defined __MSDOS__ || defined WINDOWS32
1310   int sep_char = '/';
1311 # define DIRSEP_CHAR sep_char
1312 #else
1313 # define DIRSEP_CHAR '/'
1314 #endif
1315
1316   if (dirlen == 1 && dirname[0] == '/')
1317     /* DIRNAME is just "/", so normal prepending would get us "//foo".
1318        We want "/foo" instead, so don't prepend any chars from DIRNAME.  */
1319     dirlen = 0;
1320 #if defined __MSDOS__ || defined WINDOWS32
1321   else if (dirlen > 1)
1322     {
1323       if (dirname[dirlen - 1] == '/' && dirname[dirlen - 2] == ':')
1324         /* DIRNAME is "d:/".  Don't prepend the slash from DIRNAME.  */
1325         --dirlen;
1326       else if (dirname[dirlen - 1] == ':')
1327         {
1328           /* DIRNAME is "d:".  Use `:' instead of `/'.  */
1329           --dirlen;
1330           sep_char = ':';
1331         }
1332     }
1333 #endif
1334
1335   for (i = 0; i < n; ++i)
1336     {
1337       size_t eltlen = strlen (array[i]) + 1;
1338       char *new = (char *) malloc (dirlen + 1 + eltlen);
1339       if (new == NULL)
1340         {
1341           while (i > 0)
1342             free (array[--i]);
1343           return 1;
1344         }
1345
1346       {
1347         char *endp = mempcpy (new, dirname, dirlen);
1348         *endp++ = DIRSEP_CHAR;
1349         mempcpy (endp, array[i], eltlen);
1350       }
1351       free (array[i]);
1352       array[i] = new;
1353     }
1354
1355   return 0;
1356 }
1357
1358
1359 /* We must not compile this function twice.  */
1360 #if !defined _LIBC || !defined NO_GLOB_PATTERN_P
1361 int
1362 __glob_pattern_type (const char *pattern, int quote)
1363 {
1364   const char *p;
1365   int ret = 0;
1366
1367   for (p = pattern; *p != '\0'; ++p)
1368     switch (*p)
1369       {
1370       case '?':
1371       case '*':
1372         return 1;
1373
1374       case '\\':
1375         if (quote)
1376           {
1377             if (p[1] != '\0')
1378               ++p;
1379             ret |= 2;
1380           }
1381         break;
1382
1383       case '[':
1384         ret |= 4;
1385         break;
1386
1387       case ']':
1388         if (ret & 4)
1389           return 1;
1390         break;
1391       }
1392
1393   return ret;
1394 }
1395
1396 /* Return nonzero if PATTERN contains any metacharacters.
1397    Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
1398 int
1399 __glob_pattern_p (const char *pattern, int quote)
1400 {
1401   return __glob_pattern_type (pattern, quote) == 1;
1402 }
1403 # ifdef _LIBC
1404 weak_alias (__glob_pattern_p, glob_pattern_p)
1405 # endif
1406 #endif
1407
1408 #endif /* !GLOB_ONLY_P */
1409
1410
1411 /* We put this in a separate function mainly to allow the memory
1412    allocated with alloca to be recycled.  */
1413 #if !defined _LIBC || !defined GLOB_ONLY_P
1414 static int
1415 __attribute_noinline__
1416 link_exists2_p (const char *dir, size_t dirlen, const char *fname,
1417                glob_t *pglob
1418 # ifndef _LIBC
1419                 , int flags
1420 # endif
1421                 )
1422 {
1423   size_t fnamelen = strlen (fname);
1424   char *fullname = (char *) __alloca (dirlen + 1 + fnamelen + 1);
1425   struct stat st;
1426 # ifndef _LIBC
1427   struct_stat64 st64;
1428 # endif
1429
1430   mempcpy (mempcpy (mempcpy (fullname, dir, dirlen), "/", 1),
1431            fname, fnamelen + 1);
1432
1433 # ifdef _LIBC
1434   return (*pglob->gl_stat) (fullname, &st) == 0;
1435 # else
1436   return ((__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1437            ? (*pglob->gl_stat) (fullname, &st)
1438            : __stat64 (fullname, &st64)) == 0);
1439 # endif
1440 }
1441 # ifdef _LIBC
1442 #  define link_exists_p(dfd, dirname, dirnamelen, fname, pglob, flags) \
1443   (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)                              \
1444    ? link_exists2_p (dirname, dirnamelen, fname, pglob)                       \
1445    : ({ struct stat64 st64;                                                   \
1446        __fxstatat64 (_STAT_VER, dfd, fname, &st64, 0) == 0; }))
1447 # else
1448 #  define link_exists_p(dfd, dirname, dirnamelen, fname, pglob, flags) \
1449   link_exists2_p (dirname, dirnamelen, fname, pglob, flags)
1450 # endif
1451 #endif
1452
1453
1454 /* Like `glob', but PATTERN is a final pathname component,
1455    and matches are searched for in DIRECTORY.
1456    The GLOB_NOSORT bit in FLAGS is ignored.  No sorting is ever done.
1457    The GLOB_APPEND flag is assumed to be set (always appends).  */
1458 static int
1459 glob_in_dir (const char *pattern, const char *directory, int flags,
1460              int (*errfunc) (const char *, int),
1461              glob_t *pglob, size_t alloca_used)
1462 {
1463   size_t dirlen = strlen (directory);
1464   void *stream = NULL;
1465   struct globnames
1466     {
1467       struct globnames *next;
1468       size_t count;
1469       char *name[64];
1470     };
1471 #define INITIAL_COUNT sizeof (init_names.name) / sizeof (init_names.name[0])
1472   struct globnames init_names;
1473   struct globnames *names = &init_names;
1474   struct globnames *names_alloca = &init_names;
1475   size_t nfound = 0;
1476   size_t cur = 0;
1477   int meta;
1478   int save;
1479
1480   alloca_used += sizeof (init_names);
1481
1482   init_names.next = NULL;
1483   init_names.count = INITIAL_COUNT;
1484
1485   meta = __glob_pattern_type (pattern, !(flags & GLOB_NOESCAPE));
1486   if (meta == 0 && (flags & (GLOB_NOCHECK|GLOB_NOMAGIC)))
1487     {
1488       /* We need not do any tests.  The PATTERN contains no meta
1489          characters and we must not return an error therefore the
1490          result will always contain exactly one name.  */
1491       flags |= GLOB_NOCHECK;
1492     }
1493   else if (meta == 0)
1494     {
1495       /* Since we use the normal file functions we can also use stat()
1496          to verify the file is there.  */
1497       union
1498       {
1499         struct stat st;
1500         struct_stat64 st64;
1501       } ust;
1502       size_t patlen = strlen (pattern);
1503       int alloca_fullname = __libc_use_alloca (alloca_used
1504                                                + dirlen + 1 + patlen + 1);
1505       char *fullname;
1506       if (alloca_fullname)
1507         fullname = alloca_account (dirlen + 1 + patlen + 1, alloca_used);
1508       else
1509         {
1510           fullname = malloc (dirlen + 1 + patlen + 1);
1511           if (fullname == NULL)
1512             return GLOB_NOSPACE;
1513         }
1514
1515       mempcpy (mempcpy (mempcpy (fullname, directory, dirlen),
1516                         "/", 1),
1517                pattern, patlen + 1);
1518       if ((__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1519            ? (*pglob->gl_stat) (fullname, &ust.st)
1520            : __stat64 (fullname, &ust.st64)) == 0)
1521         /* We found this file to be existing.  Now tell the rest
1522            of the function to copy this name into the result.  */
1523         flags |= GLOB_NOCHECK;
1524
1525       if (__glibc_unlikely (!alloca_fullname))
1526         free (fullname);
1527     }
1528   else
1529     {
1530       stream = (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1531                 ? (*pglob->gl_opendir) (directory)
1532                 : opendir (directory));
1533       if (stream == NULL)
1534         {
1535           if (errno != ENOTDIR
1536               && ((errfunc != NULL && (*errfunc) (directory, errno))
1537                   || (flags & GLOB_ERR)))
1538             return GLOB_ABORTED;
1539         }
1540       else
1541         {
1542 #ifdef _LIBC
1543           int dfd = (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1544                      ? -1 : dirfd ((DIR *) stream));
1545 #endif
1546           int fnm_flags = ((!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0)
1547                            | ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)
1548 #if defined _AMIGA || defined VMS
1549                            | FNM_CASEFOLD
1550 #endif
1551                            );
1552           flags |= GLOB_MAGCHAR;
1553
1554           while (1)
1555             {
1556               const char *name;
1557               size_t len;
1558 #if defined _LIBC && !defined COMPILE_GLOB64
1559               struct dirent64 *d;
1560               union
1561                 {
1562                   struct dirent64 d64;
1563                   char room [offsetof (struct dirent64, d_name[0])
1564                              + NAME_MAX + 1];
1565                 }
1566               d64buf;
1567
1568               if (__glibc_unlikely (flags & GLOB_ALTDIRFUNC))
1569                 {
1570                   struct dirent *d32 = (*pglob->gl_readdir) (stream);
1571                   if (d32 != NULL)
1572                     {
1573                       CONVERT_DIRENT_DIRENT64 (&d64buf.d64, d32);
1574                       d = &d64buf.d64;
1575                     }
1576                   else
1577                     d = NULL;
1578                 }
1579               else
1580                 d = __readdir64 (stream);
1581 #else
1582               struct dirent *d = (__builtin_expect (flags & GLOB_ALTDIRFUNC, 0)
1583                                   ? ((struct dirent *)
1584                                      (*pglob->gl_readdir) (stream))
1585                                   : __readdir (stream));
1586 #endif
1587               if (d == NULL)
1588                 break;
1589               if (! REAL_DIR_ENTRY (d))
1590                 continue;
1591
1592               /* If we shall match only directories use the information
1593                  provided by the dirent call if possible.  */
1594               if ((flags & GLOB_ONLYDIR) && !DIRENT_MIGHT_BE_DIR (d))
1595                 continue;
1596
1597               name = d->d_name;
1598
1599               if (fnmatch (pattern, name, fnm_flags) == 0)
1600                 {
1601                   /* If the file we found is a symlink we have to
1602                      make sure the target file exists.  */
1603                   if (!DIRENT_MIGHT_BE_SYMLINK (d)
1604                       || link_exists_p (dfd, directory, dirlen, name, pglob,
1605                                         flags))
1606                     {
1607                       if (cur == names->count)
1608                         {
1609                           struct globnames *newnames;
1610                           size_t count = names->count * 2;
1611                           size_t size = (sizeof (struct globnames)
1612                                          + ((count - INITIAL_COUNT)
1613                                             * sizeof (char *)));
1614                           if (__libc_use_alloca (alloca_used + size))
1615                             newnames = names_alloca
1616                               = alloca_account (size, alloca_used);
1617                           else if ((newnames = malloc (size))
1618                                    == NULL)
1619                             goto memory_error;
1620                           newnames->count = count;
1621                           newnames->next = names;
1622                           names = newnames;
1623                           cur = 0;
1624                         }
1625                       len = NAMLEN (d);
1626                       names->name[cur] = (char *) malloc (len + 1);
1627                       if (names->name[cur] == NULL)
1628                         goto memory_error;
1629                       *((char *) mempcpy (names->name[cur++], name, len))
1630                         = '\0';
1631                       ++nfound;
1632                     }
1633                 }
1634             }
1635         }
1636     }
1637
1638   if (nfound == 0 && (flags & GLOB_NOCHECK))
1639     {
1640       size_t len = strlen (pattern);
1641       nfound = 1;
1642       names->name[cur] = (char *) malloc (len + 1);
1643       if (names->name[cur] == NULL)
1644         goto memory_error;
1645       *((char *) mempcpy (names->name[cur++], pattern, len)) = '\0';
1646     }
1647
1648   int result = GLOB_NOMATCH;
1649   if (nfound != 0)
1650     {
1651       result = 0;
1652
1653       if (pglob->gl_pathc > UINTPTR_MAX - pglob->gl_offs
1654           || pglob->gl_pathc + pglob->gl_offs > UINTPTR_MAX - nfound
1655           || pglob->gl_pathc + pglob->gl_offs + nfound > UINTPTR_MAX - 1
1656           || (pglob->gl_pathc + pglob->gl_offs + nfound + 1
1657               > UINTPTR_MAX / sizeof (char *)))
1658         goto memory_error;
1659
1660       char **new_gl_pathv;
1661       new_gl_pathv
1662         = (char **) realloc (pglob->gl_pathv,
1663                              (pglob->gl_pathc + pglob->gl_offs + nfound + 1)
1664                              * sizeof (char *));
1665       if (new_gl_pathv == NULL)
1666         {
1667         memory_error:
1668           while (1)
1669             {
1670               struct globnames *old = names;
1671               for (size_t i = 0; i < cur; ++i)
1672                 free (names->name[i]);
1673               names = names->next;
1674               /* NB: we will not leak memory here if we exit without
1675                  freeing the current block assigned to OLD.  At least
1676                  the very first block is always allocated on the stack
1677                  and this is the block assigned to OLD here.  */
1678               if (names == NULL)
1679                 {
1680                   assert (old == &init_names);
1681                   break;
1682                 }
1683               cur = names->count;
1684               if (old == names_alloca)
1685                 names_alloca = names;
1686               else
1687                 free (old);
1688             }
1689           result = GLOB_NOSPACE;
1690         }
1691       else
1692         {
1693           while (1)
1694             {
1695               struct globnames *old = names;
1696               for (size_t i = 0; i < cur; ++i)
1697                 new_gl_pathv[pglob->gl_offs + pglob->gl_pathc++]
1698                   = names->name[i];
1699               names = names->next;
1700               /* NB: we will not leak memory here if we exit without
1701                  freeing the current block assigned to OLD.  At least
1702                  the very first block is always allocated on the stack
1703                  and this is the block assigned to OLD here.  */
1704               if (names == NULL)
1705                 {
1706                   assert (old == &init_names);
1707                   break;
1708                 }
1709               cur = names->count;
1710               if (old == names_alloca)
1711                 names_alloca = names;
1712               else
1713                 free (old);
1714             }
1715
1716           pglob->gl_pathv = new_gl_pathv;
1717
1718           pglob->gl_pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
1719
1720           pglob->gl_flags = flags;
1721         }
1722     }
1723
1724   if (stream != NULL)
1725     {
1726       save = errno;
1727       if (__glibc_unlikely (flags & GLOB_ALTDIRFUNC))
1728         (*pglob->gl_closedir) (stream);
1729       else
1730         closedir (stream);
1731       __set_errno (save);
1732     }
1733
1734   return result;
1735 }