util.subproj/glob.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
  27  *
  28  * Copyright (c) 1989, 1993
  29  *      The Regents of the University of California.  All rights reserved.
  30  *
  31  * This code is derived from software contributed to Berkeley by
  32  * Guido van Rossum.
  33  *
  34  * The NEXTSTEP Software License Agreement specifies the terms
  35  * and conditions for redistribution.
  36  *
  37  *      @(#)glob.c      8.3 (Berkeley) 10/13/93
  38  */
  39
  40 /*
  41  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  42  *
  43  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  44  *
  45  * Optional extra services, controlled by flags not defined by POSIX:
  46  *
  47  * GLOB_QUOTE:
  48  *      Escaping convention: \ inhibits any special meaning the following
  49  *      character might have (except \ at end of string is retained).
  50  * GLOB_MAGCHAR:
  51  *      Set in gl_flags if pattern contained a globbing character.
  52  * GLOB_NOMAGIC:
  53  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  54  *      not contain any magic characters.  [Used in csh style globbing]
  55  * GLOB_ALTDIRFUNC:
  56  *      Use alternately specified directory access functions.
  57  * GLOB_TILDE:
  58  *      expand ~user/foo to the /home/dir/of/user/foo
  59  * GLOB_BRACE:
  60  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  61  * gl_matchc:
  62  *      Number of matches in the current invocation of glob.
  63  */
  64
  65 #include <sys/param.h>
  66 #include <sys/stat.h>
  67
  68 #include <ctype.h>
  69 #include <dirent.h>
  70 #include <errno.h>
  71 #include <glob.h>
  72 #include <pwd.h>
  73 #include <stdio.h>
  74 #include <stdlib.h>
  75 #include <string.h>
  76 #include <unistd.h>
  77
  78 #define DOLLAR          '$'
  79 #define DOT             '.'
  80 #define EOS             '\0'
  81 #define LBRACKET        '['
  82 #define NOT             '!'
  83 #define QUESTION        '?'
  84 #define QUOTE           '\\'
  85 #define RANGE           '-'
  86 #define RBRACKET        ']'
  87 #define SEP             '/'
  88 #define STAR            '*'
  89 #define TILDE           '~'
  90 #define UNDERSCORE      '_'
  91 #define LBRACE          '{'
  92 #define RBRACE          '}'
  93 #define SLASH           '/'
  94 #define COMMA           ','
  95
  96 #ifndef DEBUG
  97
  98 #define M_QUOTE         0x8000
  99 #define M_PROTECT       0x4000
 100 #define M_MASK          0xffff
 101 #define M_ASCII         0x00ff
 102
 103 typedef u_short Char;
 104
 105 #else
 106
 107 #define M_QUOTE         0x80
 108 #define M_PROTECT       0x40
 109 #define M_MASK          0xff
 110 #define M_ASCII         0x7f
 111
 112 typedef char Char;
 113
 114 #endif
 115
 116
 117 #define CHAR(c)         ((Char)((c)&M_ASCII))
 118 #define META(c)         ((Char)((c)|M_QUOTE))
 119 #define M_ALL           META('*')
 120 #define M_END           META(']')
 121 #define M_NOT           META('!')
 122 #define M_ONE           META('?')
 123 #define M_RNG           META('-')
 124 #define M_SET           META('[')
 125 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 126
 127
 128 static int       compare __P((const void *, const void *));
 129 static int       g_Ctoc __P((const Char *, char *, u_int));
 130 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 131 static DIR      *g_opendir __P((Char *, glob_t *));
 132 static Char     *g_strchr __P((Char *, int));
 133 #ifdef notdef
 134 static Char     *g_strcat __P((Char *, const Char *));
 135 #endif
 136 static int       g_stat __P((Char *, struct stat *, glob_t *));
 137 static int       glob0 __P((const Char *, glob_t *, int *));
 138 static int       glob1 __P((Char *, glob_t *, int *));
 139 static int       glob2 __P((Char *, Char *, Char *, Char *, glob_t *, int *));
 140 static int       glob3 __P((Char *, Char *, Char *, Char *, Char *, glob_t *, int *));
 141 static int       globextend __P((const Char *, glob_t *, int *));
 142 static const Char *
 143                  globtilde __P((const Char *, Char *, size_t, glob_t *));
 144 static int       globexp1 __P((const Char *, glob_t *, int *));
 145 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *, int *));
 146 static int       match __P((Char *, Char *, Char *));
 147 #ifdef DEBUG
 148 static void      qprintf __P((const char *, Char *));
 149 #endif
 150
 151 int
 152 glob(pattern, flags, errfunc, pglob)
 153         const char *pattern;
 154         int flags, (*errfunc) __P((const char *, int));
 155         glob_t *pglob;
 156 {
 157         const u_char *patnext;
 158         int c, limit;
 159         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 160
 161         patnext = (u_char *) pattern;
 162         if (!(flags & GLOB_APPEND)) {
 163                 pglob->gl_pathc = 0;
 164                 pglob->gl_pathv = NULL;
 165                 if (!(flags & GLOB_DOOFFS))
 166                         pglob->gl_offs = 0;
 167         }
 168 #if !defined(GLOB_MAXPATH)
 169 #define GLOB_MAXPATH 0x1000
 170 #endif
 171         if (flags & GLOB_MAXPATH)
 172                 limit = pglob->gl_matchc;
 173         else
 174                 limit = 0;
 175         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 176         pglob->gl_errfunc = errfunc;
 177         pglob->gl_matchc = 0;
 178
 179         bufnext = patbuf;
 180         bufend = bufnext + MAXPATHLEN - 1;
 181         if (flags & GLOB_QUOTE) {
 182                 /* Protect the quoted characters. */
 183                 while (bufnext < bufend && (c = *patnext++) != EOS)
 184                         if (c == QUOTE) {
 185                                 if ((c = *patnext++) == EOS) {
 186                                         c = QUOTE;
 187                                         --patnext;
 188                                 }
 189                                 *bufnext++ = c | M_PROTECT;
 190                         }
 191                         else
 192                                 *bufnext++ = c;
 193         }
 194         else
 195             while (bufnext < bufend && (c = *patnext++) != EOS)
 196                     *bufnext++ = c;
 197         *bufnext = EOS;
 198
 199         if (flags & GLOB_BRACE)
 200             return globexp1(patbuf, pglob, &limit);
 201         else
 202             return glob0(patbuf, pglob, &limit);
 203 }
 204
 205 /*
 206  * Expand recursively a glob {} pattern. When there is no more expansion
 207  * invoke the standard globbing routine to glob the rest of the magic
 208  * characters
 209  */
 210 static int
 211 globexp1(pattern, pglob, limit)
 212         const Char *pattern;
 213         glob_t *pglob;
 214         int *limit;
 215 {
 216         const Char* ptr = pattern;
 217         int rv;
 218
 219         /* Protect a single {}, for find(1), like csh */
 220         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 221                 return glob0(pattern, pglob, limit);
 222
 223         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 224                 if (!globexp2(ptr, pattern, pglob, &rv, limit))
 225                         return rv;
 226
 227         return glob0(pattern, pglob, limit);
 228 }
 229
 230
 231 /*
 232  * Recursive brace globbing helper. Tries to expand a single brace.
 233  * If it succeeds then it invokes globexp1 with the new pattern.
 234  * If it fails then it tries to glob the rest of the pattern and returns.
 235  */
 236 static int
 237 globexp2(ptr, pattern, pglob, rv, limit)
 238         const Char *ptr, *pattern;
 239         glob_t *pglob;
 240         int *rv, *limit;
 241 {
 242         int     i;
 243         Char   *lm, *ls;
 244         const Char *pe, *pm, *pl;
 245         Char    patbuf[MAXPATHLEN];
 246
 247         /* copy part up to the brace */
 248         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 249                 continue;
 250         *lm = EOS;
 251         ls = lm;
 252
 253         /* Find the balanced brace */
 254         for (i = 0, pe = ++ptr; *pe; pe++)
 255                 if (*pe == LBRACKET) {
 256                         /* Ignore everything between [] */
 257                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 258                                 continue;
 259                         if (*pe == EOS) {
 260                                 /*
 261                                  * We could not find a matching RBRACKET.
 262                                  * Ignore and just look for RBRACE
 263                                  */
 264                                 pe = pm;
 265                         }
 266                 }
 267                 else if (*pe == LBRACE)
 268                         i++;
 269                 else if (*pe == RBRACE) {
 270                         if (i == 0)
 271                                 break;
 272                         i--;
 273                 }
 274
 275         /* Non matching braces; just glob the pattern */
 276         if (i != 0 || *pe == EOS) {
 277                 *rv = glob0(patbuf, pglob, limit);
 278                 return 0;
 279         }
 280
 281         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 282                 switch (*pm) {
 283                 case LBRACKET:
 284                         /* Ignore everything between [] */
 285                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 286                                 continue;
 287                         if (*pm == EOS) {
 288                                 /*
 289                                  * We could not find a matching RBRACKET.
 290                                  * Ignore and just look for RBRACE
 291                                  */
 292                                 pm = pl;
 293                         }
 294                         break;
 295
 296                 case LBRACE:
 297                         i++;
 298                         break;
 299
 300                 case RBRACE:
 301                         if (i) {
 302                             i--;
 303                             break;
 304                         }
 305                         /* FALLTHROUGH */
 306                 case COMMA:
 307                         if (i && *pm == COMMA)
 308                                 break;
 309                         else {
 310                                 /* Append the current string */
 311                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 312                                         continue;
 313                                 /*
 314                                  * Append the rest of the pattern after the
 315                                  * closing brace
 316                                  */
 317                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 318                                         continue;
 319
 320                                 /* Expand the current pattern */
 321 #ifdef DEBUG
 322                                 qprintf("globexp2:", patbuf);
 323 #endif
 324                                 *rv = globexp1(patbuf, pglob, limit);
 325
 326                                 /* move after the comma, to the next string */
 327                                 pl = pm + 1;
 328                         }
 329                         break;
 330
 331                 default:
 332                         break;
 333                 }
 334         *rv = 0;
 335         return 0;
 336 }
 337
 338
 339
 340 /*
 341  * expand tilde from the passwd file.
 342  */
 343 static const Char *
 344 globtilde(pattern, patbuf, patbuf_len, pglob)
 345         const Char *pattern;
 346         Char *patbuf;
 347         size_t patbuf_len;
 348         glob_t *pglob;
 349 {
 350         struct passwd *pwd;
 351         char *h;
 352         const Char *p;
 353         Char *b, *eb;
 354
 355         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 356                 return pattern;
 357
 358         /*
 359          * Copy up to the end of the string or /
 360          */
 361         eb = &patbuf[patbuf_len - 1];
 362         for (p = pattern + 1, h = (char *) patbuf;
 363             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 364                 continue;
 365
 366         *h = EOS;
 367
 368         if (((char *) patbuf)[0] == EOS) {
 369                 /*
 370                  * handle a plain ~ or ~/ by expanding $HOME first (iff
 371                  * we're not running setuid or setgid) and then trying
 372                  * the password file
 373                  */
 374                 if (
 375 #if 0
 376 #ifndef __NETBSD_SYSCALLS
 377                     issetugid() != 0 ||
 378 #endif
 379 #endif
 380                     (h = getenv("HOME")) == NULL) {
 381                         if (((h = getlogin()) != NULL &&
 382                              (pwd = getpwnam(h)) != NULL) ||
 383                             (pwd = getpwuid(getuid())) != NULL)
 384                                 h = pwd->pw_dir;
 385                         else
 386                                 return pattern;
 387                 }
 388         }
 389         else {
 390                 /*
 391                  * Expand a ~user
 392                  */
 393                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 394                         return pattern;
 395                 else
 396                         h = pwd->pw_dir;
 397         }
 398
 399         /* Copy the home directory */
 400         for (b = patbuf; b < eb && *h; *b++ = *h++)
 401                 continue;
 402
 403         /* Append the rest of the pattern */
 404         while (b < eb && (*b++ = *p++) != EOS)
 405                 continue;
 406         *b = EOS;
 407
 408         return patbuf;
 409 }
 410
 411
 412 /*
 413  * The main glob() routine: compiles the pattern (optionally processing
 414  * quotes), calls glob1() to do the real pattern matching, and finally
 415  * sorts the list (unless unsorted operation is requested).  Returns 0
 416  * if things went well, nonzero if errors occurred.  It is not an error
 417  * to find no matches.
 418  */
 419 static int
 420 glob0(pattern, pglob, limit)
 421         const Char *pattern;
 422         glob_t *pglob;
 423         int *limit;
 424 {
 425         const Char *qpatnext;
 426         int c, err, oldpathc;
 427         Char *bufnext, patbuf[MAXPATHLEN];
 428
 429         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 430         oldpathc = pglob->gl_pathc;
 431         bufnext = patbuf;
 432
 433         /* We don't need to check for buffer overflow any more. */
 434         while ((c = *qpatnext++) != EOS) {
 435                 switch (c) {
 436                 case LBRACKET:
 437                         c = *qpatnext;
 438                         if (c == NOT)
 439                                 ++qpatnext;
 440                         if (*qpatnext == EOS ||
 441                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 442                                 *bufnext++ = LBRACKET;
 443                                 if (c == NOT)
 444                                         --qpatnext;
 445                                 break;
 446                         }
 447                         *bufnext++ = M_SET;
 448                         if (c == NOT)
 449                                 *bufnext++ = M_NOT;
 450                         c = *qpatnext++;
 451                         do {
 452                                 *bufnext++ = CHAR(c);
 453                                 if (*qpatnext == RANGE &&
 454                                     (c = qpatnext[1]) != RBRACKET) {
 455                                         *bufnext++ = M_RNG;
 456                                         *bufnext++ = CHAR(c);
 457                                         qpatnext += 2;
 458                                 }
 459                         } while ((c = *qpatnext++) != RBRACKET);
 460                         pglob->gl_flags |= GLOB_MAGCHAR;
 461                         *bufnext++ = M_END;
 462                         break;
 463                 case QUESTION:
 464                         pglob->gl_flags |= GLOB_MAGCHAR;
 465                         *bufnext++ = M_ONE;
 466                         break;
 467                 case STAR:
 468                         pglob->gl_flags |= GLOB_MAGCHAR;
 469                         /* collapse adjacent stars to one,
 470                          * to avoid exponential behavior
 471                          */
 472                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 473                             *bufnext++ = M_ALL;
 474                         break;
 475                 default:
 476                         *bufnext++ = CHAR(c);
 477                         break;
 478                 }
 479         }
 480         *bufnext = EOS;
 481 #ifdef DEBUG
 482         qprintf("glob0:", patbuf);
 483 #endif
 484
 485         if ((err = glob1(patbuf, pglob, limit)) != 0)
 486                 return(err);
 487
 488         /*
 489          * If there was no match we are going to append the pattern
 490          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 491          * and the pattern did not contain any magic characters
 492          * GLOB_NOMAGIC is there just for compatibility with csh.
 493          */
 494         if (pglob->gl_pathc == oldpathc &&
 495             ((pglob->gl_flags & GLOB_NOCHECK) ||
 496               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 497                !(pglob->gl_flags & GLOB_MAGCHAR))))
 498                 return(globextend(pattern, pglob, limit));
 499         else if (!(pglob->gl_flags & GLOB_NOSORT))
 500                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 501                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 502         return(0);
 503 }
 504
 505 static int
 506 compare(p, q)
 507         const void *p, *q;
 508 {
 509         return(strcmp(*(char **)p, *(char **)q));
 510 }
 511
 512 static int
 513 glob1(pattern, pglob, limit)
 514         Char *pattern;
 515         glob_t *pglob;
 516         int *limit;
 517 {
 518         Char pathbuf[MAXPATHLEN];
 519
 520         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 521         if (*pattern == EOS)
 522                 return(0);
 523         return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
 524             pattern, pglob, limit));
 525 }
 526
 527 /*
 528  * The functions glob2 and glob3 are mutually recursive; there is one level
 529  * of recursion for each segment in the pattern that contains one or more
 530  * meta characters.
 531  */
 532 static int
 533 glob2(pathbuf, pathend, pathend_last, pattern, pglob, limit)
 534         Char *pathbuf, *pathend, *pathend_last, *pattern;
 535         glob_t *pglob;
 536         int *limit;
 537 {
 538         struct stat sb;
 539         Char *p, *q;
 540         int anymeta;
 541
 542         /*
 543          * Loop over pattern segments until end of pattern or until
 544          * segment with meta character found.
 545          */
 546         for (anymeta = 0;;) {
 547                 if (*pattern == EOS) {          /* End of pattern? */
 548                         *pathend = EOS;
 549                         if (g_lstat(pathbuf, &sb, pglob))
 550                                 return(0);
 551
 552                         if (((pglob->gl_flags & GLOB_MARK) &&
 553                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 554                             || (S_ISLNK(sb.st_mode) &&
 555                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 556                             S_ISDIR(sb.st_mode)))) {
 557                                 if (pathend + 1 > pathend_last)
 558                                         return (1);
 559                                 *pathend++ = SEP;
 560                                 *pathend = EOS;
 561                         }
 562                         ++pglob->gl_matchc;
 563                         return(globextend(pathbuf, pglob, limit));
 564                 }
 565
 566                 /* Find end of next segment, copy tentatively to pathend. */
 567                 q = pathend;
 568                 p = pattern;
 569                 while (*p != EOS && *p != SEP) {
 570                         if (ismeta(*p))
 571                                 anymeta = 1;
 572                         if (q + 1 > pathend_last)
 573                                 return (1);
 574                         *q++ = *p++;
 575                 }
 576
 577                 if (!anymeta) {         /* No expansion, do next segment. */
 578                         pathend = q;
 579                         pattern = p;
 580                         while (*pattern == SEP) {
 581                                 if (pathend + 1 > pathend_last)
 582                                         return (1);
 583                                 *pathend++ = *pattern++;
 584                         }
 585                 } else                  /* Need expansion, recurse. */
 586                         return(glob3(pathbuf, pathend, pathend_last, pattern, p,
 587                             pglob, limit));
 588         }
 589         /* NOTREACHED */
 590 }
 591
 592 static int
 593 glob3(pathbuf, pathend, pathend_last, pattern, restpattern, pglob, limit)
 594         Char *pathbuf, *pathend, *pathend_last, *pattern, *restpattern;
 595         glob_t *pglob;
 596         int *limit;
 597 {
 598         register struct dirent *dp;
 599         DIR *dirp;
 600         int err;
 601         char buf[MAXPATHLEN];
 602
 603         /*
 604          * The readdirfunc declaration can't be prototyped, because it is
 605          * assigned, below, to two functions which are prototyped in glob.h
 606          * and dirent.h as taking pointers to differently typed opaque
 607          * structures.
 608          */
 609         struct dirent *(*readdirfunc)();
 610
 611         if (pathend > pathend_last)
 612                 return (1);
 613         *pathend = EOS;
 614         errno = 0;
 615
 616         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 617                 /* TODO: don't call for ENOENT or ENOTDIR? */
 618                 if (pglob->gl_errfunc) {
 619                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 620                                 return (GLOB_ABEND);
 621                         if (pglob->gl_errfunc(buf, errno) ||
 622                             pglob->gl_flags & GLOB_ERR)
 623                                 return (GLOB_ABEND);
 624                 }
 625                 return(0);
 626         }
 627
 628         err = 0;
 629
 630         /* Search directory for matching names. */
 631         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 632                 readdirfunc = pglob->gl_readdir;
 633         else
 634                 readdirfunc = readdir;
 635         while ((dp = (*readdirfunc)(dirp))) {
 636                 register u_char *sc;
 637                 register Char *dc;
 638
 639                 /* Initial DOT must be matched literally. */
 640                 if (dp->d_name[0] == DOT && *pattern != DOT)
 641                         continue;
 642                 dc = pathend;
 643                 sc = (u_char *) dp->d_name;
 644                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 645                         ;
 646                 if (!match(pathend, pattern, restpattern)) {
 647                         *pathend = EOS;
 648                         continue;
 649                 }
 650                 err = glob2(pathbuf, --dc, pathend_last, restpattern,
 651                     pglob, limit);
 652                 if (err)
 653                         break;
 654         }
 655
 656         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 657                 (*pglob->gl_closedir)(dirp);
 658         else
 659                 closedir(dirp);
 660         return(err);
 661 }
 662
 663
 664 /*
 665  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 666  * add the new item, and update gl_pathc.
 667  *
 668  * This assumes the BSD realloc, which only copies the block when its size
 669  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 670  * behavior.
 671  *
 672  * Return 0 if new item added, error code if memory couldn't be allocated.
 673  *
 674  * Invariant of the glob_t structure:
 675  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 676  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 677  */
 678 static int
 679 globextend(path, pglob, limit)
 680         const Char *path;
 681         glob_t *pglob;
 682         int *limit;
 683 {
 684         register char **pathv;
 685         register int i;
 686         u_int newsize, len;
 687         char *copy;
 688         const Char *p;
 689
 690         if (*limit && pglob->gl_pathc > *limit)
 691 #if !defined(GLOB_LIMIT)
 692 #define GLOB_LIMIT (-3)
 693 #endif
 694                 return (GLOB_LIMIT);
 695
 696         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 697         pathv = pglob->gl_pathv ?
 698                     realloc((char *)pglob->gl_pathv, newsize) :
 699                     malloc(newsize);
 700         if (pathv == NULL) {
 701                 if (pglob->gl_pathv) {
 702                         free(pglob->gl_pathv);
 703                         pglob->gl_pathv = NULL;
 704                 }
 705                 return(GLOB_NOSPACE);
 706         }
 707
 708         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 709                 /* first time around -- clear initial gl_offs items */
 710                 pathv += pglob->gl_offs;
 711                 for (i = pglob->gl_offs; --i >= 0; )
 712                         *--pathv = NULL;
 713         }
 714         pglob->gl_pathv = pathv;
 715
 716         for (p = path; *p++;)
 717                 continue;
 718         len = (size_t)(p - path);
 719         if ((copy = malloc(len)) != NULL) {
 720                 if (g_Ctoc(path, copy, len)) {
 721                         free(copy);
 722                         return (GLOB_NOSPACE);
 723                 }
 724                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 725         }
 726         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 727         return(copy == NULL ? GLOB_NOSPACE : 0);
 728 }
 729
 730 /*
 731  * pattern matching function for filenames.  Each occurrence of the *
 732  * pattern causes a recursion level.
 733  */
 734 static int
 735 match(name, pat, patend)
 736         register Char *name, *pat, *patend;
 737 {
 738         int ok, negate_range;
 739         Char c, k;
 740
 741         while (pat < patend) {
 742                 c = *pat++;
 743                 switch (c & M_MASK) {
 744                 case M_ALL:
 745                         if (pat == patend)
 746                                 return(1);
 747                         do
 748                             if (match(name, pat, patend))
 749                                     return(1);
 750                         while (*name++ != EOS);
 751                         return(0);
 752                 case M_ONE:
 753                         if (*name++ == EOS)
 754                                 return(0);
 755                         break;
 756                 case M_SET:
 757                         ok = 0;
 758                         if ((k = *name++) == EOS)
 759                                 return(0);
 760                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 761                                 ++pat;
 762                         while (((c = *pat++) & M_MASK) != M_END)
 763                                 if ((*pat & M_MASK) == M_RNG) {
 764                                 if (c <= k && k <= pat[1])
 765                                         ok = 1;
 766                                 pat += 2;
 767                                 } else if (c == k)
 768                                         ok = 1;
 769                         if (ok == negate_range)
 770                                 return(0);
 771                         break;
 772                 default:
 773                         if (*name++ != c)
 774                                 return(0);
 775                         break;
 776                 }
 777         }
 778         return(*name == EOS);
 779 }
 780
 781 /* Free allocated data belonging to a glob_t structure. */
 782 void
 783 globfree(pglob)
 784         glob_t *pglob;
 785 {
 786         register int i;
 787         register char **pp;
 788
 789         if (pglob->gl_pathv != NULL) {
 790                 pp = pglob->gl_pathv + pglob->gl_offs;
 791                 for (i = pglob->gl_pathc; i--; ++pp)
 792                         if (*pp)
 793                                 free(*pp);
 794                 free(pglob->gl_pathv);
 795                 pglob->gl_pathv = NULL;
 796         }
 797 }
 798
 799 static DIR *
 800 g_opendir(str, pglob)
 801         register Char *str;
 802         glob_t *pglob;
 803 {
 804         char buf[MAXPATHLEN];
 805
 806         if (!*str)
 807                 strcpy(buf, ".");
 808         else {
 809                 if (g_Ctoc(str, buf, sizeof(buf)))
 810                         return (NULL);
 811         }
 812
 813         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 814                 return((*pglob->gl_opendir)(buf));
 815
 816         return(opendir(buf));
 817 }
 818
 819 static int
 820 g_lstat(fn, sb, pglob)
 821         register Char *fn;
 822         struct stat *sb;
 823         glob_t *pglob;
 824 {
 825         char buf[MAXPATHLEN];
 826
 827         if (g_Ctoc(fn, buf, sizeof(buf))) {
 828                 errno = ENAMETOOLONG;
 829                 return (-1);
 830         }
 831         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 832                 return((*pglob->gl_lstat)(buf, sb));
 833         return(lstat(buf, sb));
 834 }
 835
 836 static int
 837 g_stat(fn, sb, pglob)
 838         register Char *fn;
 839         struct stat *sb;
 840         glob_t *pglob;
 841 {
 842         char buf[MAXPATHLEN];
 843
 844         if (g_Ctoc(fn, buf, sizeof(buf))) {
 845                 errno = ENAMETOOLONG;
 846                 return (-1);
 847         }
 848         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 849                 return((*pglob->gl_stat)(buf, sb));
 850         return(stat(buf, sb));
 851 }
 852
 853 static Char *
 854 g_strchr(str, ch)
 855         Char *str;
 856         int ch;
 857 {
 858         do {
 859                 if (*str == ch)
 860                         return (str);
 861         } while (*str++);
 862         return (NULL);
 863 }
 864
 865 static int
 866 g_Ctoc(str, buf, len)
 867         const Char *str;
 868         char *buf;
 869         u_int len;
 870 {
 871
 872         while (len--) {
 873                 if ((*buf++ = *str++) == '\0')
 874                         return (0);
 875         }
 876         return (1);
 877 }
 878
 879 #ifdef DEBUG
 880 static void
 881 qprintf(str, s)
 882         const char *str;
 883         register Char *s;
 884 {
 885         register Char *p;
 886
 887         (void)printf("%s:\n", str);
 888         for (p = s; *p; p++)
 889                 (void)printf("%c", CHAR(*p));
 890         (void)printf("\n");
 891         for (p = s; *p; p++)
 892                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 893         (void)printf("\n");
 894         for (p = s; *p; p++)
 895                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 896         (void)printf("\n");
 897 }
 898 #endif