posix/glob.c

   1 /* Copyright (C) 1991, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
   2
   3 This library is free software; you can redistribute it and/or
   4 modify it under the terms of the GNU Library General Public License as
   5 published by the Free Software Foundation; either version 2 of the
   6 License, or (at your option) any later version.
   7
   8 This library is distributed in the hope that it will be useful,
   9 but WITHOUT ANY WARRANTY; without even the implied warranty of
  10 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  11 Library General Public License for more details.
  12
  13 You should have received a copy of the GNU Library General Public
  14 License along with this library; see the file COPYING.LIB.  If
  15 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  16 Cambridge, MA 02139, USA.  */
  17
  18 /* AIX requires this to be the first thing in the file.  */
  19 #if defined (_AIX) && !defined (__GNUC__)
  20  #pragma alloca
  21 #endif
  22
  23 #ifdef  HAVE_CONFIG_H
  24 #include <config.h>
  25 #endif
  26
  27 #include <errno.h>
  28 #include <sys/types.h>
  29 #include <sys/stat.h>
  30
  31
  32 /* Comment out all this code if we are using the GNU C Library, and are not
  33    actually compiling the library itself.  This code is part of the GNU C
  34    Library, but also included in many other GNU distributions.  Compiling
  35    and linking in this code is a waste when using the GNU C library
  36    (especially if it is a shared library).  Rather than having every GNU
  37    program understand `configure --with-gnu-libc' and omit the object files,
  38    it is simpler to just do this in the source for each such file.  */
  39
  40 #if defined (_LIBC) || !defined (__GNU_LIBRARY__)
  41
  42
  43 #ifdef  STDC_HEADERS
  44 #include <stddef.h>
  45 #endif
  46
  47 #ifdef  HAVE_UNISTD_H
  48 #include <unistd.h>
  49 #ifndef POSIX
  50 #ifdef  _POSIX_VERSION
  51 #define POSIX
  52 #endif
  53 #endif
  54 #endif
  55
  56 #if !defined(__GNU_LIBRARY__) && !defined(STDC_HEADERS)
  57 extern int errno;
  58 #endif
  59
  60 #ifndef NULL
  61 #define NULL    0
  62 #endif
  63
  64
  65 #if     defined (POSIX) || defined (HAVE_DIRENT_H) || defined (__GNU_LIBRARY__)
  66 #include <dirent.h>
  67 #ifndef __GNU_LIBRARY__
  68 #define D_NAMLEN(d) strlen((d)->d_name)
  69 #else   /* GNU C library.  */
  70 #define D_NAMLEN(d) ((d)->d_namlen)
  71 #endif  /* Not GNU C library.  */
  72 #else   /* Not POSIX or HAVE_DIRENT_H.  */
  73 #define direct dirent
  74 #define D_NAMLEN(d) ((d)->d_namlen)
  75 #ifdef  HAVE_SYS_NDIR_H
  76 #include <sys/ndir.h>
  77 #endif  /* HAVE_SYS_NDIR_H */
  78 #ifdef  HAVE_SYS_DIR_H
  79 #include <sys/dir.h>
  80 #endif  /* HAVE_SYS_DIR_H */
  81 #ifdef HAVE_NDIR_H
  82 #include <ndir.h>
  83 #endif  /* HAVE_NDIR_H */
  84 #endif  /* POSIX or HAVE_DIRENT_H or __GNU_LIBRARY__.  */
  85
  86 #if defined (POSIX) && !defined (__GNU_LIBRARY__)
  87 /* Posix does not require that the d_ino field be present, and some
  88    systems do not provide it. */
  89 #define REAL_DIR_ENTRY(dp) 1
  90 #else
  91 #define REAL_DIR_ENTRY(dp) (dp->d_ino != 0)
  92 #endif /* POSIX */
  93
  94 #if     (defined (STDC_HEADERS) || defined (__GNU_LIBRARY__))
  95 #include <stdlib.h>
  96 #include <string.h>
  97 #define ANSI_STRING
  98 #else   /* No standard headers.  */
  99
 100 #ifdef HAVE_STRING_H
 101 #include <string.h>
 102 #define ANSI_STRING
 103 #else
 104 #include <strings.h>
 105 #endif
 106 #ifdef  HAVE_MEMORY_H
 107 #include <memory.h>
 108 #endif
 109
 110 extern char *malloc (), *realloc ();
 111 extern void free ();
 112
 113 extern void qsort ();
 114 extern void abort (), exit ();
 115
 116 #endif  /* Standard headers.  */
 117
 118 #ifndef ANSI_STRING
 119
 120 #ifndef bzero
 121 extern void bzero ();
 122 #endif
 123 #ifndef bcopy
 124 extern void bcopy ();
 125 #endif
 126
 127 #define memcpy(d, s, n) bcopy ((s), (d), (n))
 128 #define strrchr rindex
 129 /* memset is only used for zero here, but let's be paranoid.  */
 130 #define memset(s, better_be_zero, n) \
 131   ((void) ((better_be_zero) == 0 ? (bzero((s), (n)), 0) : (abort(), 0)))
 132 #endif  /* Not ANSI_STRING.  */
 133
 134 #ifndef HAVE_STRCOLL
 135 #define strcoll strcmp
 136 #endif
 137
 138
 139 #ifndef __GNU_LIBRARY__
 140 #ifdef  __GNUC__
 141 __inline
 142 #endif
 143 static char *
 144 my_realloc (p, n)
 145      char *p;
 146      unsigned int n;
 147 {
 148   /* These casts are the for sake of the broken Ultrix compiler,
 149      which warns of illegal pointer combinations otherwise.  */
 150   if (p == NULL)
 151     return (char *) malloc (n);
 152   return (char *) realloc (p, n);
 153 }
 154 #define realloc my_realloc
 155 #endif
 156
 157
 158 #if     !defined(__alloca) && !defined(__GNU_LIBRARY__)
 159
 160 #ifdef  __GNUC__
 161 #undef  alloca
 162 #define alloca(n)       __builtin_alloca (n)
 163 #else   /* Not GCC.  */
 164 #if     defined (sparc) || defined (HAVE_ALLOCA_H)
 165 #include <alloca.h>
 166 #else   /* Not sparc or HAVE_ALLOCA_H.  */
 167 #ifndef _AIX
 168 extern char *alloca ();
 169 #endif  /* Not _AIX.  */
 170 #endif  /* sparc or HAVE_ALLOCA_H.  */
 171 #endif  /* GCC.  */
 172
 173 #define __alloca        alloca
 174
 175 #endif
 176
 177 #ifndef __GNU_LIBRARY__
 178 #define __lstat lstat
 179 #ifndef HAVE_LSTAT
 180 #define lstat stat
 181 #endif
 182 #ifdef STAT_MACROS_BROKEN
 183 #undef S_ISDIR
 184 #endif
 185 #ifndef S_ISDIR
 186 #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
 187 #endif
 188 #endif
 189
 190 #ifndef STDC_HEADERS
 191 #undef  size_t
 192 #define size_t  unsigned int
 193 #endif
 194
 195 /* Some system header files erroneously define these.
 196    We want our own definitions from <fnmatch.h> to take precedence.  */
 197 #undef  FNM_PATHNAME
 198 #undef  FNM_NOESCAPE
 199 #undef  FNM_PERIOD
 200 #include <fnmatch.h>
 201
 202 /* Some system header files erroneously define these.
 203    We want our own definitions from <glob.h> to take precedence.  */
 204 #undef  GLOB_ERR
 205 #undef  GLOB_MARK
 206 #undef  GLOB_NOSORT
 207 #undef  GLOB_DOOFFS
 208 #undef  GLOB_NOCHECK
 209 #undef  GLOB_APPEND
 210 #undef  GLOB_NOESCAPE
 211 #undef  GLOB_PERIOD
 212 #include <glob.h>
 213 \f
 214 __ptr_t (*__glob_opendir_hook) __P ((const char *directory));
 215 const char *(*__glob_readdir_hook) __P ((__ptr_t stream));
 216 void (*__glob_closedir_hook) __P ((__ptr_t stream));
 217
 218 static int glob_pattern_p __P ((const char *pattern, int quote));
 219 static int glob_in_dir __P ((const char *pattern, const char *directory,
 220                              int flags,
 221                              int (*errfunc) __P ((const char *, int)),
 222                              glob_t *pglob));
 223 static int prefix_array __P ((const char *prefix, char **array, size_t n));
 224 static int collated_compare __P ((const __ptr_t, const __ptr_t));
 225
 226 /* Do glob searching for PATTERN, placing results in PGLOB.
 227    The bits defined above may be set in FLAGS.
 228    If a directory cannot be opened or read and ERRFUNC is not nil,
 229    it is called with the pathname that caused the error, and the
 230    `errno' value from the failing call; if it returns non-zero
 231    `glob' returns GLOB_ABEND; if it returns zero, the error is ignored.
 232    If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
 233    Otherwise, `glob' returns zero.  */
 234 int
 235 glob (pattern, flags, errfunc, pglob)
 236      const char *pattern;
 237      int flags;
 238      int (*errfunc) __P ((const char *, int));
 239      glob_t *pglob;
 240 {
 241   const char *filename;
 242   char *dirname;
 243   size_t dirlen;
 244   int status;
 245   int oldcount;
 246
 247   if (pattern == NULL || pglob == NULL || (flags & ~__GLOB_FLAGS) != 0)
 248     {
 249       errno = EINVAL;
 250       return -1;
 251     }
 252
 253   /* Find the filename.  */
 254   filename = strrchr (pattern, '/');
 255   if (filename == NULL)
 256     {
 257       filename = pattern;
 258       dirname = (char *) ".";
 259       dirlen = 0;
 260     }
 261   else if (filename == pattern)
 262     {
 263       /* "/pattern".  */
 264       dirname = (char *) "/";
 265       dirlen = 1;
 266       ++filename;
 267     }
 268   else
 269     {
 270       dirlen = filename - pattern;
 271       dirname = (char *) __alloca (dirlen + 1);
 272       memcpy (dirname, pattern, dirlen);
 273       dirname[dirlen] = '\0';
 274       ++filename;
 275     }
 276
 277   if (filename[0] == '\0' && dirlen > 1)
 278     /* "pattern/".  Expand "pattern", appending slashes.  */
 279     {
 280       int val = glob (dirname, flags | GLOB_MARK, errfunc, pglob);
 281       if (val == 0)
 282         pglob->gl_flags = (pglob->gl_flags & ~GLOB_MARK) | (flags & GLOB_MARK);
 283       return val;
 284     }
 285
 286   if (!(flags & GLOB_APPEND))
 287     {
 288       pglob->gl_pathc = 0;
 289       pglob->gl_pathv = NULL;
 290     }
 291
 292   oldcount = pglob->gl_pathc;
 293
 294   if (glob_pattern_p (dirname, !(flags & GLOB_NOESCAPE)))
 295     {
 296       /* The directory name contains metacharacters, so we
 297          have to glob for the directory, and then glob for
 298          the pattern in each directory found.  */
 299       glob_t dirs;
 300       register int i;
 301
 302       status = glob (dirname,
 303                      ((flags & (GLOB_ERR | GLOB_NOCHECK | GLOB_NOESCAPE)) |
 304                       GLOB_NOSORT),
 305                      errfunc, &dirs);
 306       if (status != 0)
 307         return status;
 308
 309       /* We have successfully globbed the preceding directory name.
 310          For each name we found, call glob_in_dir on it and FILENAME,
 311          appending the results to PGLOB.  */
 312       for (i = 0; i < dirs.gl_pathc; ++i)
 313         {
 314           int oldcount;
 315
 316 #ifdef  SHELL
 317           {
 318             /* Make globbing interruptible in the bash shell. */
 319             extern int interrupt_state;
 320
 321             if (interrupt_state)
 322               {
 323                 globfree (&dirs);
 324                 globfree (&files);
 325                 return GLOB_ABEND;
 326               }
 327           }
 328 #endif /* SHELL.  */
 329
 330           oldcount = pglob->gl_pathc;
 331           status = glob_in_dir (filename, dirs.gl_pathv[i],
 332                                 (flags | GLOB_APPEND) & ~GLOB_NOCHECK,
 333                                 errfunc, pglob);
 334           if (status == GLOB_NOMATCH)
 335             /* No matches in this directory.  Try the next.  */
 336             continue;
 337
 338           if (status != 0)
 339             {
 340               globfree (&dirs);
 341               globfree (pglob);
 342               return status;
 343             }
 344
 345           /* Stick the directory on the front of each name.  */
 346           if (prefix_array (dirs.gl_pathv[i],
 347                             &pglob->gl_pathv[oldcount],
 348                             pglob->gl_pathc - oldcount))
 349             {
 350               globfree (&dirs);
 351               globfree (pglob);
 352               return GLOB_NOSPACE;
 353             }
 354         }
 355
 356       flags |= GLOB_MAGCHAR;
 357
 358       if (pglob->gl_pathc == oldcount)
 359         /* No matches.  */
 360         if (flags & GLOB_NOCHECK)
 361           {
 362             size_t len = strlen (pattern) + 1;
 363             char *patcopy = (char *) malloc (len);
 364             if (patcopy == NULL)
 365               return GLOB_NOSPACE;
 366             memcpy (patcopy, pattern, len);
 367
 368             pglob->gl_pathv
 369               = (char **) realloc (pglob->gl_pathv,
 370                                    (pglob->gl_pathc +
 371                                     ((flags & GLOB_DOOFFS) ?
 372                                      pglob->gl_offs : 0) +
 373                                     1 + 1) *
 374                                    sizeof (char *));
 375             if (pglob->gl_pathv == NULL)
 376               {
 377                 free (patcopy);
 378                 return GLOB_NOSPACE;
 379               }
 380
 381             if (flags & GLOB_DOOFFS)
 382               while (pglob->gl_pathc < pglob->gl_offs)
 383                 pglob->gl_pathv[pglob->gl_pathc++] = NULL;
 384
 385             pglob->gl_pathv[pglob->gl_pathc++] = patcopy;
 386             pglob->gl_pathv[pglob->gl_pathc] = NULL;
 387             pglob->gl_flags = flags;
 388           }
 389         else
 390           return GLOB_NOMATCH;
 391     }
 392   else
 393     {
 394       status = glob_in_dir (filename, dirname, flags, errfunc, pglob);
 395       if (status != 0)
 396         return status;
 397
 398       if (dirlen > 0)
 399         {
 400           /* Stick the directory on the front of each name.  */
 401           if (prefix_array (dirname,
 402                             &pglob->gl_pathv[oldcount],
 403                             pglob->gl_pathc - oldcount))
 404             {
 405               globfree (pglob);
 406               return GLOB_NOSPACE;
 407             }
 408         }
 409     }
 410
 411   if (flags & GLOB_MARK)
 412     {
 413       /* Append slashes to directory names.  */
 414       int i;
 415       struct stat st;
 416       for (i = oldcount; i < pglob->gl_pathc; ++i)
 417         if (__lstat (pglob->gl_pathv[i], &st) == 0 &&
 418             S_ISDIR (st.st_mode))
 419           {
 420             size_t len = strlen (pglob->gl_pathv[i]) + 2;
 421             char *new = realloc (pglob->gl_pathv[i], len);
 422             if (new == NULL)
 423               {
 424                 globfree (pglob);
 425                 return GLOB_NOSPACE;
 426               }
 427             strcpy (&new[len - 2], "/");
 428             pglob->gl_pathv[i] = new;
 429           }
 430     }
 431
 432   if (!(flags & GLOB_NOSORT))
 433     /* Sort the vector.  */
 434     qsort ((__ptr_t) &pglob->gl_pathv[oldcount],
 435            pglob->gl_pathc - oldcount,
 436            sizeof (char *), collated_compare);
 437
 438   return 0;
 439 }
 440
 441
 442 /* Free storage allocated in PGLOB by a previous `glob' call.  */
 443 void
 444 globfree (pglob)
 445      register glob_t *pglob;
 446 {
 447   if (pglob->gl_pathv != NULL)
 448     {
 449       register int i;
 450       for (i = 0; i < pglob->gl_pathc; ++i)
 451         if (pglob->gl_pathv[i] != NULL)
 452           free ((__ptr_t) pglob->gl_pathv[i]);
 453       free ((__ptr_t) pglob->gl_pathv);
 454     }
 455 }
 456
 457
 458 /* Do a collated comparison of A and B.  */
 459 static int
 460 collated_compare (a, b)
 461      const __ptr_t a;
 462      const __ptr_t b;
 463 {
 464   const char *const s1 = *(const char *const * const) a;
 465   const char *const s2 = *(const char *const * const) b;
 466
 467   if (s1 == s2)
 468     return 0;
 469   if (s1 == NULL)
 470     return 1;
 471   if (s2 == NULL)
 472     return -1;
 473   return strcoll (s1, s2);
 474 }
 475
 476
 477 /* Prepend DIRNAME to each of N members of ARRAY, replacing ARRAY's
 478    elements in place.  Return nonzero if out of memory, zero if successful.
 479    A slash is inserted between DIRNAME and each elt of ARRAY,
 480    unless DIRNAME is just "/".  Each old element of ARRAY is freed.  */
 481 static int
 482 prefix_array (dirname, array, n)
 483      const char *dirname;
 484      char **array;
 485      size_t n;
 486 {
 487   register size_t i;
 488   size_t dirlen = strlen (dirname);
 489
 490   if (dirlen == 1 && dirname[0] == '/')
 491     /* DIRNAME is just "/", so normal prepending would get us "//foo".
 492        We want "/foo" instead, so don't prepend any chars from DIRNAME.  */
 493     dirlen = 0;
 494
 495   for (i = 0; i < n; ++i)
 496     {
 497       size_t eltlen = strlen (array[i]) + 1;
 498       char *new = (char *) malloc (dirlen + 1 + eltlen);
 499       if (new == NULL)
 500         {
 501           while (i > 0)
 502             free ((__ptr_t) array[--i]);
 503           return 1;
 504         }
 505
 506       memcpy (new, dirname, dirlen);
 507       new[dirlen] = '/';
 508       memcpy (&new[dirlen + 1], array[i], eltlen);
 509       free ((__ptr_t) array[i]);
 510       array[i] = new;
 511     }
 512
 513   return 0;
 514 }
 515
 516
 517 /* Return nonzero if PATTERN contains any metacharacters.
 518    Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
 519 static int
 520 glob_pattern_p (pattern, quote)
 521      const char *pattern;
 522      int quote;
 523 {
 524   register const char *p;
 525   int open = 0;
 526
 527   for (p = pattern; *p != '\0'; ++p)
 528     switch (*p)
 529       {
 530       case '?':
 531       case '*':
 532         return 1;
 533
 534       case '\\':
 535         if (quote)
 536           ++p;
 537         break;
 538
 539       case '[':
 540         open = 1;
 541         break;
 542
 543       case ']':
 544         if (open)
 545           return 1;
 546         break;
 547       }
 548
 549   return 0;
 550 }
 551
 552
 553 /* Like `glob', but PATTERN is a final pathname component,
 554    and matches are searched for in DIRECTORY.
 555    The GLOB_NOSORT bit in FLAGS is ignored.  No sorting is ever done.
 556    The GLOB_APPEND flag is assumed to be set (always appends).  */
 557 static int
 558 glob_in_dir (pattern, directory, flags, errfunc, pglob)
 559      const char *pattern;
 560      const char *directory;
 561      int flags;
 562      int (*errfunc) __P ((const char *, int));
 563      glob_t *pglob;
 564 {
 565   __ptr_t stream;
 566
 567   struct globlink
 568     {
 569       struct globlink *next;
 570       char *name;
 571     };
 572   struct globlink *names = NULL;
 573   size_t nfound = 0;
 574
 575   if (!glob_pattern_p (pattern, !(flags & GLOB_NOESCAPE)))
 576     {
 577       stream = NULL;
 578       flags |= GLOB_NOCHECK;
 579     }
 580   else
 581     {
 582       flags |= GLOB_MAGCHAR;
 583
 584       stream = (__glob_opendir_hook ? (*__glob_opendir_hook) (directory)
 585                 : (__ptr_t) opendir (directory));
 586       if (stream == NULL)
 587         {
 588           if ((errfunc != NULL && (*errfunc) (directory, errno)) ||
 589               (flags & GLOB_ERR))
 590             return GLOB_ABEND;
 591         }
 592       else
 593         while (1)
 594           {
 595             const char *name;
 596             size_t len;
 597
 598             if (__glob_readdir_hook)
 599               {
 600                 name = (*__glob_readdir_hook) (stream);
 601                 if (name == NULL)
 602                   break;
 603                 len = 0;
 604               }
 605             else
 606               {
 607                 struct dirent *d = readdir ((DIR *) stream);
 608                 if (d == NULL)
 609                   break;
 610                 if (! REAL_DIR_ENTRY (d))
 611                   continue;
 612                 name = d->d_name;
 613 #ifdef  HAVE_D_NAMLEN
 614                 len = d->d_namlen;
 615 #else
 616                 len = 0;
 617 #endif
 618               }
 619
 620             if (fnmatch (pattern, name,
 621                          (!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0) |
 622                          ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)) == 0)
 623               {
 624                 struct globlink *new
 625                   = (struct globlink *) __alloca (sizeof (struct globlink));
 626                 if (len == 0)
 627                   len = strlen (name);
 628                 new->name
 629                   = (char *) malloc (len + 1);
 630                 if (new->name == NULL)
 631                   goto memory_error;
 632                 memcpy ((__ptr_t) new->name, name, len);
 633                 new->name[len] = '\0';
 634                 new->next = names;
 635                 names = new;
 636                 ++nfound;
 637               }
 638           }
 639     }
 640
 641   if (nfound == 0 && (flags & GLOB_NOCHECK))
 642     {
 643       size_t len = strlen (pattern);
 644       nfound = 1;
 645       names = (struct globlink *) __alloca (sizeof (struct globlink));
 646       names->next = NULL;
 647       names->name = (char *) malloc (len + 1);
 648       if (names->name == NULL)
 649         goto memory_error;
 650       memcpy (names->name, pattern, len);
 651       names->name[len] = '\0';
 652     }
 653
 654   pglob->gl_pathv
 655     = (char **) realloc (pglob->gl_pathv,
 656                          (pglob->gl_pathc +
 657                           ((flags & GLOB_DOOFFS) ? pglob->gl_offs : 0) +
 658                           nfound + 1) *
 659                          sizeof (char *));
 660   if (pglob->gl_pathv == NULL)
 661     goto memory_error;
 662
 663   if (flags & GLOB_DOOFFS)
 664     while (pglob->gl_pathc < pglob->gl_offs)
 665       pglob->gl_pathv[pglob->gl_pathc++] = NULL;
 666
 667   for (; names != NULL; names = names->next)
 668     pglob->gl_pathv[pglob->gl_pathc++] = names->name;
 669   pglob->gl_pathv[pglob->gl_pathc] = NULL;
 670
 671   pglob->gl_flags = flags;
 672
 673   if (stream != NULL)
 674     {
 675       int save = errno;
 676       if (__glob_closedir_hook)
 677         (*__glob_closedir_hook) (stream);
 678       else
 679         (void) closedir ((DIR *) stream);
 680       errno = save;
 681     }
 682   return nfound == 0 ? GLOB_NOMATCH : 0;
 683
 684  memory_error:
 685   {
 686     int save = errno;
 687     if (__glob_closedir_hook)
 688       (*__glob_closedir_hook) (stream);
 689     else
 690       (void) closedir ((DIR *) stream);
 691     errno = save;
 692   }
 693   while (names != NULL)
 694     {
 695       if (names->name != NULL)
 696         free ((__ptr_t) names->name);
 697       names = names->next;
 698     }
 699   return GLOB_NOSPACE;
 700 }
 701
 702 #endif  /* _LIBC or not __GNU_LIBRARY__.  */