glob/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 #define S_ISDIR(mode) (((mode) & S_IFMT) == S_IFDIR)
 185 #endif
 186 #endif
 187
 188 #ifndef STDC_HEADERS
 189 #undef  size_t
 190 #define size_t  unsigned int
 191 #endif
 192
 193 /* Some system header files erroneously define these.
 194    We want our own definitions from <fnmatch.h> to take precedence.  */
 195 #undef  FNM_PATHNAME
 196 #undef  FNM_NOESCAPE
 197 #undef  FNM_PERIOD
 198 #include <fnmatch.h>
 199
 200 /* Some system header files erroneously define these.
 201    We want our own definitions from <glob.h> to take precedence.  */
 202 #undef  GLOB_ERR
 203 #undef  GLOB_MARK
 204 #undef  GLOB_NOSORT
 205 #undef  GLOB_DOOFFS
 206 #undef  GLOB_NOCHECK
 207 #undef  GLOB_APPEND
 208 #undef  GLOB_NOESCAPE
 209 #undef  GLOB_PERIOD
 210 #include <glob.h>
 211 \f
 212 __ptr_t (*__glob_opendir_hook) __P ((const char *directory));
 213 const char *(*__glob_readdir_hook) __P ((__ptr_t stream));
 214 void (*__glob_closedir_hook) __P ((__ptr_t stream));
 215
 216 static int glob_pattern_p __P ((const char *pattern, int quote));
 217 static int glob_in_dir __P ((const char *pattern, const char *directory,
 218                              int flags,
 219                              int (*errfunc) __P ((const char *, int)),
 220                              glob_t *pglob));
 221 static int prefix_array __P ((const char *prefix, char **array, size_t n));
 222 static int collated_compare __P ((const __ptr_t, const __ptr_t));
 223
 224 /* Do glob searching for PATTERN, placing results in PGLOB.
 225    The bits defined above may be set in FLAGS.
 226    If a directory cannot be opened or read and ERRFUNC is not nil,
 227    it is called with the pathname that caused the error, and the
 228    `errno' value from the failing call; if it returns non-zero
 229    `glob' returns GLOB_ABEND; if it returns zero, the error is ignored.
 230    If memory cannot be allocated for PGLOB, GLOB_NOSPACE is returned.
 231    Otherwise, `glob' returns zero.  */
 232 int
 233 glob (pattern, flags, errfunc, pglob)
 234      const char *pattern;
 235      int flags;
 236      int (*errfunc) __P ((const char *, int));
 237      glob_t *pglob;
 238 {
 239   const char *filename;
 240   char *dirname;
 241   size_t dirlen;
 242   int status;
 243   int oldcount;
 244
 245   if (pattern == NULL || pglob == NULL || (flags & ~__GLOB_FLAGS) != 0)
 246     {
 247       errno = EINVAL;
 248       return -1;
 249     }
 250
 251   /* Find the filename.  */
 252   filename = strrchr (pattern, '/');
 253   if (filename == NULL)
 254     {
 255       filename = pattern;
 256       dirname = (char *) ".";
 257       dirlen = 0;
 258     }
 259   else if (filename == pattern)
 260     {
 261       /* "/pattern".  */
 262       dirname = (char *) "/";
 263       dirlen = 1;
 264       ++filename;
 265     }
 266   else
 267     {
 268       dirlen = filename - pattern;
 269       dirname = (char *) __alloca (dirlen + 1);
 270       memcpy (dirname, pattern, dirlen);
 271       dirname[dirlen] = '\0';
 272       ++filename;
 273     }
 274
 275   if (filename[0] == '\0' && dirlen > 1)
 276     /* "pattern/".  Expand "pattern", appending slashes.  */
 277     {
 278       int val = glob (dirname, flags | GLOB_MARK, errfunc, pglob);
 279       if (val == 0)
 280         pglob->gl_flags = (pglob->gl_flags & ~GLOB_MARK) | (flags & GLOB_MARK);
 281       return val;
 282     }
 283
 284   if (!(flags & GLOB_APPEND))
 285     {
 286       pglob->gl_pathc = 0;
 287       pglob->gl_pathv = NULL;
 288     }
 289
 290   oldcount = pglob->gl_pathc;
 291
 292   if (glob_pattern_p (dirname, !(flags & GLOB_NOESCAPE)))
 293     {
 294       /* The directory name contains metacharacters, so we
 295          have to glob for the directory, and then glob for
 296          the pattern in each directory found.  */
 297       glob_t dirs;
 298       register int i;
 299
 300       status = glob (dirname,
 301                      ((flags & (GLOB_ERR | GLOB_NOCHECK | GLOB_NOESCAPE)) |
 302                       GLOB_NOSORT),
 303                      errfunc, &dirs);
 304       if (status != 0)
 305         return status;
 306
 307       /* We have successfully globbed the preceding directory name.
 308          For each name we found, call glob_in_dir on it and FILENAME,
 309          appending the results to PGLOB.  */
 310       for (i = 0; i < dirs.gl_pathc; ++i)
 311         {
 312           int oldcount;
 313
 314 #ifdef  SHELL
 315           {
 316             /* Make globbing interruptible in the bash shell. */
 317             extern int interrupt_state;
 318
 319             if (interrupt_state)
 320               {
 321                 globfree (&dirs);
 322                 globfree (&files);
 323                 return GLOB_ABEND;
 324               }
 325           }
 326 #endif /* SHELL.  */
 327
 328           oldcount = pglob->gl_pathc;
 329           status = glob_in_dir (filename, dirs.gl_pathv[i],
 330                                 (flags | GLOB_APPEND) & ~GLOB_NOCHECK,
 331                                 errfunc, pglob);
 332           if (status == GLOB_NOMATCH)
 333             /* No matches in this directory.  Try the next.  */
 334             continue;
 335
 336           if (status != 0)
 337             {
 338               globfree (&dirs);
 339               globfree (pglob);
 340               return status;
 341             }
 342
 343           /* Stick the directory on the front of each name.  */
 344           if (prefix_array (dirs.gl_pathv[i],
 345                             &pglob->gl_pathv[oldcount],
 346                             pglob->gl_pathc - oldcount))
 347             {
 348               globfree (&dirs);
 349               globfree (pglob);
 350               return GLOB_NOSPACE;
 351             }
 352         }
 353
 354       flags |= GLOB_MAGCHAR;
 355
 356       if (pglob->gl_pathc == oldcount)
 357         /* No matches.  */
 358         if (flags & GLOB_NOCHECK)
 359           {
 360             size_t len = strlen (pattern) + 1;
 361             char *patcopy = (char *) malloc (len);
 362             if (patcopy == NULL)
 363               return GLOB_NOSPACE;
 364             memcpy (patcopy, pattern, len);
 365
 366             pglob->gl_pathv
 367               = (char **) realloc (pglob->gl_pathv,
 368                                    (pglob->gl_pathc +
 369                                     ((flags & GLOB_DOOFFS) ?
 370                                      pglob->gl_offs : 0) +
 371                                     1 + 1) *
 372                                    sizeof (char *));
 373             if (pglob->gl_pathv == NULL)
 374               {
 375                 free (patcopy);
 376                 return GLOB_NOSPACE;
 377               }
 378
 379             if (flags & GLOB_DOOFFS)
 380               while (pglob->gl_pathc < pglob->gl_offs)
 381                 pglob->gl_pathv[pglob->gl_pathc++] = NULL;
 382
 383             pglob->gl_pathv[pglob->gl_pathc++] = patcopy;
 384             pglob->gl_pathv[pglob->gl_pathc] = NULL;
 385             pglob->gl_flags = flags;
 386           }
 387         else
 388           return GLOB_NOMATCH;
 389     }
 390   else
 391     {
 392       status = glob_in_dir (filename, dirname, flags, errfunc, pglob);
 393       if (status != 0)
 394         return status;
 395
 396       if (dirlen > 0)
 397         {
 398           /* Stick the directory on the front of each name.  */
 399           if (prefix_array (dirname,
 400                             &pglob->gl_pathv[oldcount],
 401                             pglob->gl_pathc - oldcount))
 402             {
 403               globfree (pglob);
 404               return GLOB_NOSPACE;
 405             }
 406         }
 407     }
 408
 409   if (flags & GLOB_MARK)
 410     {
 411       /* Append slashes to directory names.  glob_in_dir has already
 412          allocated the extra character for us.  */
 413       int i;
 414       struct stat st;
 415       for (i = oldcount; i < pglob->gl_pathc; ++i)
 416         if (__lstat (pglob->gl_pathv[i], &st) == 0 &&
 417             S_ISDIR (st.st_mode))
 418           strcat (pglob->gl_pathv[i], "/");
 419     }
 420
 421   if (!(flags & GLOB_NOSORT))
 422     /* Sort the vector.  */
 423     qsort ((__ptr_t) &pglob->gl_pathv[oldcount],
 424            pglob->gl_pathc - oldcount,
 425            sizeof (char *), collated_compare);
 426
 427   return 0;
 428 }
 429
 430
 431 /* Free storage allocated in PGLOB by a previous `glob' call.  */
 432 void
 433 globfree (pglob)
 434      register glob_t *pglob;
 435 {
 436   if (pglob->gl_pathv != NULL)
 437     {
 438       register int i;
 439       for (i = 0; i < pglob->gl_pathc; ++i)
 440         if (pglob->gl_pathv[i] != NULL)
 441           free ((__ptr_t) pglob->gl_pathv[i]);
 442       free ((__ptr_t) pglob->gl_pathv);
 443     }
 444 }
 445
 446
 447 /* Do a collated comparison of A and B.  */
 448 static int
 449 collated_compare (a, b)
 450      const __ptr_t a;
 451      const __ptr_t b;
 452 {
 453   const char *const s1 = *(const char *const * const) a;
 454   const char *const s2 = *(const char *const * const) b;
 455
 456   if (s1 == s2)
 457     return 0;
 458   if (s1 == NULL)
 459     return 1;
 460   if (s2 == NULL)
 461     return -1;
 462   return strcoll (s1, s2);
 463 }
 464
 465
 466 /* Prepend DIRNAME to each of N members of ARRAY, replacing ARRAY's
 467    elements in place.  Return nonzero if out of memory, zero if successful.
 468    A slash is inserted between DIRNAME and each elt of ARRAY,
 469    unless DIRNAME is just "/".  Each old element of ARRAY is freed.  */
 470 static int
 471 prefix_array (dirname, array, n)
 472      const char *dirname;
 473      char **array;
 474      size_t n;
 475 {
 476   register size_t i;
 477   size_t dirlen = strlen (dirname);
 478
 479   if (dirlen == 1 && dirname[0] == '/')
 480     /* DIRNAME is just "/", so normal prepending would get us "//foo".
 481        We want "/foo" instead, so don't prepend any chars from DIRNAME.  */
 482     dirlen = 0;
 483
 484   for (i = 0; i < n; ++i)
 485     {
 486       size_t eltlen = strlen (array[i]) + 1;
 487       char *new = (char *) malloc (dirlen + 1 + eltlen);
 488       if (new == NULL)
 489         {
 490           while (i > 0)
 491             free ((__ptr_t) array[--i]);
 492           return 1;
 493         }
 494
 495       memcpy (new, dirname, dirlen);
 496       new[dirlen] = '/';
 497       memcpy (&new[dirlen + 1], array[i], eltlen);
 498       free ((__ptr_t) array[i]);
 499       array[i] = new;
 500     }
 501
 502   return 0;
 503 }
 504
 505
 506 /* Return nonzero if PATTERN contains any metacharacters.
 507    Metacharacters can be quoted with backslashes if QUOTE is nonzero.  */
 508 static int
 509 glob_pattern_p (pattern, quote)
 510      const char *pattern;
 511      int quote;
 512 {
 513   register const char *p;
 514   int open = 0;
 515
 516   for (p = pattern; *p != '\0'; ++p)
 517     switch (*p)
 518       {
 519       case '?':
 520       case '*':
 521         return 1;
 522
 523       case '\\':
 524         if (quote)
 525           ++p;
 526         break;
 527
 528       case '[':
 529         open = 1;
 530         break;
 531
 532       case ']':
 533         if (open)
 534           return 1;
 535         break;
 536       }
 537
 538   return 0;
 539 }
 540
 541
 542 /* Like `glob', but PATTERN is a final pathname component,
 543    and matches are searched for in DIRECTORY.
 544    The GLOB_NOSORT bit in FLAGS is ignored.  No sorting is ever done.
 545    The GLOB_APPEND flag is assumed to be set (always appends).  */
 546 static int
 547 glob_in_dir (pattern, directory, flags, errfunc, pglob)
 548      const char *pattern;
 549      const char *directory;
 550      int flags;
 551      int (*errfunc) __P ((const char *, int));
 552      glob_t *pglob;
 553 {
 554   __ptr_t stream;
 555
 556   struct globlink
 557     {
 558       struct globlink *next;
 559       char *name;
 560     };
 561   struct globlink *names = NULL;
 562   size_t nfound = 0;
 563
 564   if (!glob_pattern_p (pattern, !(flags & GLOB_NOESCAPE)))
 565     {
 566       stream = NULL;
 567       flags |= GLOB_NOCHECK;
 568     }
 569   else
 570     {
 571       flags |= GLOB_MAGCHAR;
 572
 573       stream = (__glob_opendir_hook ? (*__glob_opendir_hook) (directory)
 574                 : (__ptr_t) opendir (directory));
 575       if (stream == NULL)
 576         {
 577           if ((errfunc != NULL && (*errfunc) (directory, errno)) ||
 578               (flags & GLOB_ERR))
 579             return GLOB_ABEND;
 580         }
 581       else
 582         while (1)
 583           {
 584             const char *name;
 585             size_t len;
 586
 587             if (__glob_readdir_hook)
 588               {
 589                 name = (*__glob_readdir_hook) (stream);
 590                 if (name == NULL)
 591                   break;
 592                 len = 0;
 593               }
 594             else
 595               {
 596                 struct dirent *d = readdir ((DIR *) stream);
 597                 if (d == NULL)
 598                   break;
 599                 if (! REAL_DIR_ENTRY (d))
 600                   continue;
 601                 name = d->d_name;
 602 #ifdef  HAVE_D_NAMLEN
 603                 len = d->d_namlen;
 604 #else
 605                 len = 0;
 606 #endif
 607               }
 608
 609             if (fnmatch (pattern, name,
 610                          (!(flags & GLOB_PERIOD) ? FNM_PERIOD : 0) |
 611                          ((flags & GLOB_NOESCAPE) ? FNM_NOESCAPE : 0)) == 0)
 612               {
 613                 struct globlink *new
 614                   = (struct globlink *) __alloca (sizeof (struct globlink));
 615                 if (len == 0)
 616                   len = strlen (name);
 617                 new->name
 618                   = (char *) malloc (len + ((flags & GLOB_MARK) ? 1 : 0) + 1);
 619                 if (new->name == NULL)
 620                   goto memory_error;
 621                 memcpy ((__ptr_t) new->name, name, len);
 622                 new->name[len] = '\0';
 623                 new->next = names;
 624                 names = new;
 625                 ++nfound;
 626               }
 627           }
 628     }
 629
 630   if (nfound == 0 && (flags & GLOB_NOCHECK))
 631     {
 632       size_t len = strlen (pattern);
 633       nfound = 1;
 634       names = (struct globlink *) __alloca (sizeof (struct globlink));
 635       names->next = NULL;
 636       names->name = (char *) malloc (len + 1);
 637       if (names->name == NULL)
 638         goto memory_error;
 639       memcpy (names->name, pattern, len);
 640       names->name[len] = '\0';
 641     }
 642
 643   pglob->gl_pathv
 644     = (char **) realloc (pglob->gl_pathv,
 645                          (pglob->gl_pathc +
 646                           ((flags & GLOB_DOOFFS) ? pglob->gl_offs : 0) +
 647                           nfound + 1) *
 648                          sizeof (char *));
 649   if (pglob->gl_pathv == NULL)
 650     goto memory_error;
 651
 652   if (flags & GLOB_DOOFFS)
 653     while (pglob->gl_pathc < pglob->gl_offs)
 654       pglob->gl_pathv[pglob->gl_pathc++] = NULL;
 655
 656   for (; names != NULL; names = names->next)
 657     pglob->gl_pathv[pglob->gl_pathc++] = names->name;
 658   pglob->gl_pathv[pglob->gl_pathc] = NULL;
 659
 660   pglob->gl_flags = flags;
 661
 662   if (stream != NULL)
 663     {
 664       int save = errno;
 665       if (__glob_closedir_hook)
 666         (*__glob_closedir_hook) (stream);
 667       else
 668         (void) closedir ((DIR *) stream);
 669       errno = save;
 670     }
 671   return nfound == 0 ? GLOB_NOMATCH : 0;
 672
 673  memory_error:
 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   while (names != NULL)
 683     {
 684       if (names->name != NULL)
 685         free ((__ptr_t) names->name);
 686       names = names->next;
 687     }
 688   return GLOB_NOSPACE;
 689 }
 690
 691 #endif  /* _LIBC or not __GNU_LIBRARY__.  */