compat/lib/glob.c

   1 /*
   2  *      Ported to Linux's Second Extended File System as part of the
   3  *      dump and restore backup suit
   4  *      Remy Card <card@Linux.EU.Org>, 1994, 1995, 1996
   5  *
   6  */
   7
   8 /*
   9  * Copyright (c) 1989, 1993
  10  *      The Regents of the University of California.  All rights reserved.
  11  *
  12  * This code is derived from software contributed to Berkeley by
  13  * Guido van Rossum.
  14  *
  15  * Redistribution and use in source and binary forms, with or without
  16  * modification, are permitted provided that the following conditions
  17  * are met:
  18  * 1. Redistributions of source code must retain the above copyright
  19  *    notice, this list of conditions and the following disclaimer.
  20  * 2. Redistributions in binary form must reproduce the above copyright
  21  *    notice, this list of conditions and the following disclaimer in the
  22  *    documentation and/or other materials provided with the distribution.
  23  * 3. All advertising materials mentioning features or use of this software
  24  *    must display the following acknowledgement:
  25  *      This product includes software developed by the University of
  26  *      California, Berkeley and its contributors.
  27  * 4. Neither the name of the University nor the names of its contributors
  28  *    may be used to endorse or promote products derived from this software
  29  *    without specific prior written permission.
  30  *
  31  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  32  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  33  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  34  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  35  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  36  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  37  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  38  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  39  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  40  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  41  * SUCH DAMAGE.
  42  */
  43
  44 #if defined(LIBC_SCCS) && !defined(lint)
  45 static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
  46 #endif /* LIBC_SCCS and not lint */
  47
  48 /*
  49  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  50  *
  51  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  52  *
  53  * Optional extra services, controlled by flags not defined by POSIX:
  54  *
  55  * GLOB_QUOTE:
  56  *      Escaping convention: \ inhibits any special meaning the following
  57  *      character might have (except \ at end of string is retained).
  58  * GLOB_MAGCHAR:
  59  *      Set in gl_flags if pattern contained a globbing character.
  60  * GLOB_NOMAGIC:
  61  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  62  *      not contain any magic characters.  [Used in csh style globbing]
  63  * GLOB_ALTDIRFUNC:
  64  *      Use alternately specified directory access functions.
  65  * GLOB_TILDE:
  66  *      expand ~user/foo to the /home/dir/of/user/foo
  67  * GLOB_BRACE:
  68  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  69  * gl_matchc:
  70  *      Number of matches in the current invocation of glob.
  71  */
  72
  73 #include <sys/param.h>
  74 #include <sys/stat.h>
  75
  76 #include <ctype.h>
  77 #include <dirent.h>
  78 #include <errno.h>
  79 #include <glob.h>
  80 #include <pwd.h>
  81 #include <stdio.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <unistd.h>
  85
  86 #define DOLLAR          '$'
  87 #define DOT             '.'
  88 #define EOS             '\0'
  89 #define LBRACKET        '['
  90 #define NOT             '!'
  91 #define QUESTION        '?'
  92 #define QUOTE           '\\'
  93 #define RANGE           '-'
  94 #define RBRACKET        ']'
  95 #define SEP             '/'
  96 #define STAR            '*'
  97 #define TILDE           '~'
  98 #define UNDERSCORE      '_'
  99 #define LBRACE          '{'
 100 #define RBRACE          '}'
 101 #define SLASH           '/'
 102 #define COMMA           ','
 103
 104 #ifndef DEBUG
 105
 106 #define M_QUOTE         0x8000
 107 #define M_PROTECT       0x4000
 108 #define M_MASK          0xffff
 109 #define M_ASCII         0x00ff
 110
 111 typedef u_short Char;
 112
 113 #else
 114
 115 #define M_QUOTE         0x80
 116 #define M_PROTECT       0x40
 117 #define M_MASK          0xff
 118 #define M_ASCII         0x7f
 119
 120 typedef char Char;
 121
 122 #endif
 123
 124
 125 #define CHAR(c)         ((Char)((c)&M_ASCII))
 126 #define META(c)         ((Char)((c)|M_QUOTE))
 127 #define M_ALL           META('*')
 128 #define M_END           META(']')
 129 #define M_NOT           META('!')
 130 #define M_ONE           META('?')
 131 #define M_RNG           META('-')
 132 #define M_SET           META('[')
 133 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 134
 135
 136 static int       compare __P((const void *, const void *));
 137 static void      g_Ctoc __P((const Char *, char *));
 138 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 139 static DIR      *g_opendir __P((Char *, glob_t *));
 140 static Char     *g_strchr __P((Char *, int));
 141 #ifdef notdef
 142 static Char     *g_strcat __P((Char *, const Char *));
 143 #endif
 144 static int       g_stat __P((Char *, struct stat *, glob_t *));
 145 static int       glob0 __P((const Char *, glob_t *));
 146 static int       glob1 __P((Char *, glob_t *));
 147 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 148 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 149 static int       globextend __P((const Char *, glob_t *));
 150 static const Char *      globtilde __P((const Char *, Char *, glob_t *));
 151 static int       globexp1 __P((const Char *, glob_t *));
 152 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 153 static int       match __P((Char *, Char *, Char *));
 154 #ifdef DEBUG
 155 static void      qprintf __P((const char *, Char *));
 156 #endif
 157
 158 int
 159 glob(pattern, flags, errfunc, pglob)
 160         const char *pattern;
 161         int flags, (*errfunc) __P((const char *, int));
 162         glob_t *pglob;
 163 {
 164         const u_char *patnext;
 165         int c;
 166         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 167
 168         patnext = (u_char *) pattern;
 169         if (!(flags & GLOB_APPEND)) {
 170                 pglob->gl_pathc = 0;
 171                 pglob->gl_pathv = NULL;
 172                 if (!(flags & GLOB_DOOFFS))
 173                         pglob->gl_offs = 0;
 174         }
 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;
 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);
 201         else
 202             return glob0(patbuf, pglob);
 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 globexp1(pattern, pglob)
 211         const Char *pattern;
 212         glob_t *pglob;
 213 {
 214         const Char* ptr = pattern;
 215         int rv;
 216
 217         /* Protect a single {}, for find(1), like csh */
 218         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 219                 return glob0(pattern, pglob);
 220
 221         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 222                 if (!globexp2(ptr, pattern, pglob, &rv))
 223                         return rv;
 224
 225         return glob0(pattern, pglob);
 226 }
 227
 228
 229 /*
 230  * Recursive brace globbing helper. Tries to expand a single brace.
 231  * If it succeeds then it invokes globexp1 with the new pattern.
 232  * If it fails then it tries to glob the rest of the pattern and returns.
 233  */
 234 static int globexp2(ptr, pattern, pglob, rv)
 235         const Char *ptr, *pattern;
 236         glob_t *pglob;
 237         int *rv;
 238 {
 239         int     i;
 240         Char   *lm, *ls;
 241         const Char *pe, *pm, *pl;
 242         Char    patbuf[MAXPATHLEN + 1];
 243
 244         /* copy part up to the brace */
 245         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 246                 continue;
 247         ls = lm;
 248
 249         /* Find the balanced brace */
 250         for (i = 0, pe = ++ptr; *pe; pe++)
 251                 if (*pe == LBRACKET) {
 252                         /* Ignore everything between [] */
 253                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 254                                 continue;
 255                         if (*pe == EOS) {
 256                                 /*
 257                                  * We could not find a matching RBRACKET.
 258                                  * Ignore and just look for RBRACE
 259                                  */
 260                                 pe = pm;
 261                         }
 262                 }
 263                 else if (*pe == LBRACE)
 264                         i++;
 265                 else if (*pe == RBRACE) {
 266                         if (i == 0)
 267                                 break;
 268                         i--;
 269                 }
 270
 271         /* Non matching braces; just glob the pattern */
 272         if (i != 0 || *pe == EOS) {
 273                 *rv = glob0(patbuf, pglob);
 274                 return 0;
 275         }
 276
 277         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 278                 switch (*pm) {
 279                 case LBRACKET:
 280                         /* Ignore everything between [] */
 281                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 282                                 continue;
 283                         if (*pm == EOS) {
 284                                 /*
 285                                  * We could not find a matching RBRACKET.
 286                                  * Ignore and just look for RBRACE
 287                                  */
 288                                 pm = pl;
 289                         }
 290                         break;
 291
 292                 case LBRACE:
 293                         i++;
 294                         break;
 295
 296                 case RBRACE:
 297                         if (i) {
 298                             i--;
 299                             break;
 300                         }
 301                         /* FALLTHROUGH */
 302                 case COMMA:
 303                         if (i && *pm == COMMA)
 304                                 break;
 305                         else {
 306                                 /* Append the current string */
 307                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 308                                         continue;
 309                                 /*
 310                                  * Append the rest of the pattern after the
 311                                  * closing brace
 312                                  */
 313                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 314                                         continue;
 315
 316                                 /* Expand the current pattern */
 317 #ifdef DEBUG
 318                                 qprintf("globexp2:", patbuf);
 319 #endif
 320                                 *rv = globexp1(patbuf, pglob);
 321
 322                                 /* move after the comma, to the next string */
 323                                 pl = pm + 1;
 324                         }
 325                         break;
 326
 327                 default:
 328                         break;
 329                 }
 330         *rv = 0;
 331         return 0;
 332 }
 333
 334
 335
 336 /*
 337  * expand tilde from the passwd file.
 338  */
 339 static const Char *
 340 globtilde(pattern, patbuf, pglob)
 341         const Char *pattern;
 342         Char *patbuf;
 343         glob_t *pglob;
 344 {
 345         struct passwd *pwd;
 346         char *h;
 347         const Char *p;
 348         Char *b;
 349
 350         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 351                 return pattern;
 352
 353         /* Copy up to the end of the string or / */
 354         for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
 355              *h++ = *p++)
 356                 continue;
 357
 358         *h = EOS;
 359
 360         if (((char *) patbuf)[0] == EOS) {
 361                 /*
 362                  * handle a plain ~ or ~/ by expanding $HOME
 363                  * first and then trying the password file
 364                  */
 365                 if ((h = getenv("HOME")) == NULL) {
 366                         if ((pwd = getpwuid(getuid())) == NULL)
 367                                 return pattern;
 368                         else
 369                                 h = pwd->pw_dir;
 370                 }
 371         }
 372         else {
 373                 /*
 374                  * Expand a ~user
 375                  */
 376                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 377                         return pattern;
 378                 else
 379                         h = pwd->pw_dir;
 380         }
 381
 382         /* Copy the home directory */
 383         for (b = patbuf; *h; *b++ = *h++)
 384                 continue;
 385
 386         /* Append the rest of the pattern */
 387         while ((*b++ = *p++) != EOS)
 388                 continue;
 389
 390         return patbuf;
 391 }
 392
 393
 394 /*
 395  * The main glob() routine: compiles the pattern (optionally processing
 396  * quotes), calls glob1() to do the real pattern matching, and finally
 397  * sorts the list (unless unsorted operation is requested).  Returns 0
 398  * if things went well, nonzero if errors occurred.  It is not an error
 399  * to find no matches.
 400  */
 401 static int
 402 glob0(pattern, pglob)
 403         const Char *pattern;
 404         glob_t *pglob;
 405 {
 406         const Char *qpatnext;
 407         int c, err, oldpathc;
 408         Char *bufnext, patbuf[MAXPATHLEN+1];
 409
 410         qpatnext = globtilde(pattern, patbuf, pglob);
 411         oldpathc = pglob->gl_pathc;
 412         bufnext = patbuf;
 413
 414         /* We don't need to check for buffer overflow any more. */
 415         while ((c = *qpatnext++) != EOS) {
 416                 switch (c) {
 417                 case LBRACKET:
 418                         c = *qpatnext;
 419                         if (c == NOT)
 420                                 ++qpatnext;
 421                         if (*qpatnext == EOS ||
 422                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 423                                 *bufnext++ = LBRACKET;
 424                                 if (c == NOT)
 425                                         --qpatnext;
 426                                 break;
 427                         }
 428                         *bufnext++ = M_SET;
 429                         if (c == NOT)
 430                                 *bufnext++ = M_NOT;
 431                         c = *qpatnext++;
 432                         do {
 433                                 *bufnext++ = CHAR(c);
 434                                 if (*qpatnext == RANGE &&
 435                                     (c = qpatnext[1]) != RBRACKET) {
 436                                         *bufnext++ = M_RNG;
 437                                         *bufnext++ = CHAR(c);
 438                                         qpatnext += 2;
 439                                 }
 440                         } while ((c = *qpatnext++) != RBRACKET);
 441                         pglob->gl_flags |= GLOB_MAGCHAR;
 442                         *bufnext++ = M_END;
 443                         break;
 444                 case QUESTION:
 445                         pglob->gl_flags |= GLOB_MAGCHAR;
 446                         *bufnext++ = M_ONE;
 447                         break;
 448                 case STAR:
 449                         pglob->gl_flags |= GLOB_MAGCHAR;
 450                         /* collapse adjacent stars to one,
 451                          * to avoid exponential behavior
 452                          */
 453                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 454                             *bufnext++ = M_ALL;
 455                         break;
 456                 default:
 457                         *bufnext++ = CHAR(c);
 458                         break;
 459                 }
 460         }
 461         *bufnext = EOS;
 462 #ifdef DEBUG
 463         qprintf("glob0:", patbuf);
 464 #endif
 465
 466         if ((err = glob1(patbuf, pglob)) != 0)
 467                 return(err);
 468
 469         /*
 470          * If there was no match we are going to append the pattern
 471          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 472          * and the pattern did not contain any magic characters
 473          * GLOB_NOMAGIC is there just for compatibility with csh.
 474          */
 475         if (pglob->gl_pathc == oldpathc &&
 476             ((pglob->gl_flags & GLOB_NOCHECK) ||
 477               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 478                !(pglob->gl_flags & GLOB_MAGCHAR))))
 479                 return(globextend(pattern, pglob));
 480         else if (!(pglob->gl_flags & GLOB_NOSORT))
 481                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 482                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 483         return(0);
 484 }
 485
 486 static int
 487 compare(p, q)
 488         const void *p, *q;
 489 {
 490         return(strcmp(*(char **)p, *(char **)q));
 491 }
 492
 493 static int
 494 glob1(pattern, pglob)
 495         Char *pattern;
 496         glob_t *pglob;
 497 {
 498         Char pathbuf[MAXPATHLEN+1];
 499
 500         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 501         if (*pattern == EOS)
 502                 return(0);
 503         return(glob2(pathbuf, pathbuf, pattern, pglob));
 504 }
 505
 506 /*
 507  * The functions glob2 and glob3 are mutually recursive; there is one level
 508  * of recursion for each segment in the pattern that contains one or more
 509  * meta characters.
 510  */
 511 static int
 512 glob2(pathbuf, pathend, pattern, pglob)
 513         Char *pathbuf, *pathend, *pattern;
 514         glob_t *pglob;
 515 {
 516         struct stat sb;
 517         Char *p, *q;
 518         int anymeta;
 519
 520         /*
 521          * Loop over pattern segments until end of pattern or until
 522          * segment with meta character found.
 523          */
 524         for (anymeta = 0;;) {
 525                 if (*pattern == EOS) {          /* End of pattern? */
 526                         *pathend = EOS;
 527                         if (g_lstat(pathbuf, &sb, pglob))
 528                                 return(0);
 529
 530                         if (((pglob->gl_flags & GLOB_MARK) &&
 531                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 532                             || (S_ISLNK(sb.st_mode) &&
 533                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 534                             S_ISDIR(sb.st_mode)))) {
 535                                 *pathend++ = SEP;
 536                                 *pathend = EOS;
 537                         }
 538                         ++pglob->gl_matchc;
 539                         return(globextend(pathbuf, pglob));
 540                 }
 541
 542                 /* Find end of next segment, copy tentatively to pathend. */
 543                 q = pathend;
 544                 p = pattern;
 545                 while (*p != EOS && *p != SEP) {
 546                         if (ismeta(*p))
 547                                 anymeta = 1;
 548                         *q++ = *p++;
 549                 }
 550
 551                 if (!anymeta) {         /* No expansion, do next segment. */
 552                         pathend = q;
 553                         pattern = p;
 554                         while (*pattern == SEP)
 555                                 *pathend++ = *pattern++;
 556                 } else                  /* Need expansion, recurse. */
 557                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 558         }
 559         /* NOTREACHED */
 560 }
 561
 562 static int
 563 glob3(pathbuf, pathend, pattern, restpattern, pglob)
 564         Char *pathbuf, *pathend, *pattern, *restpattern;
 565         glob_t *pglob;
 566 {
 567         register struct dirent *dp;
 568         DIR *dirp;
 569         int err;
 570         char buf[MAXPATHLEN];
 571
 572         /*
 573          * The readdirfunc declaration can't be prototyped, because it is
 574          * assigned, below, to two functions which are prototyped in glob.h
 575          * and dirent.h as taking pointers to differently typed opaque
 576          * structures.
 577          */
 578         struct dirent *(*readdirfunc)();
 579
 580         *pathend = EOS;
 581         errno = 0;
 582
 583         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 584                 /* TODO: don't call for ENOENT or ENOTDIR? */
 585                 if (pglob->gl_errfunc) {
 586                         g_Ctoc(pathbuf, buf);
 587                         if (pglob->gl_errfunc(buf, errno) ||
 588                             pglob->gl_flags & GLOB_ERR)
 589                                 return (GLOB_ABEND);
 590                 }
 591                 return(0);
 592         }
 593
 594         err = 0;
 595
 596         /* Search directory for matching names. */
 597         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 598                 readdirfunc = pglob->gl_readdir;
 599         else
 600                 readdirfunc = readdir;
 601         while ((dp = (*readdirfunc)(dirp))) {
 602                 register u_char *sc;
 603                 register Char *dc;
 604
 605                 /* Initial DOT must be matched literally. */
 606                 if (dp->d_name[0] == DOT && *pattern != DOT)
 607                         continue;
 608                 for (sc = (u_char *) dp->d_name, dc = pathend;
 609                      (*dc++ = *sc++) != EOS;)
 610                         continue;
 611                 if (!match(pathend, pattern, restpattern)) {
 612                         *pathend = EOS;
 613                         continue;
 614                 }
 615                 err = glob2(pathbuf, --dc, restpattern, pglob);
 616                 if (err)
 617                         break;
 618         }
 619
 620         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 621                 (*pglob->gl_closedir)(dirp);
 622         else
 623                 closedir(dirp);
 624         return(err);
 625 }
 626
 627
 628 /*
 629  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 630  * add the new item, and update gl_pathc.
 631  *
 632  * This assumes the BSD realloc, which only copies the block when its size
 633  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 634  * behavior.
 635  *
 636  * Return 0 if new item added, error code if memory couldn't be allocated.
 637  *
 638  * Invariant of the glob_t structure:
 639  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 640  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 641  */
 642 static int
 643 globextend(path, pglob)
 644         const Char *path;
 645         glob_t *pglob;
 646 {
 647         register char **pathv;
 648         register int i;
 649         u_int newsize;
 650         char *copy;
 651         const Char *p;
 652
 653         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 654         pathv = pglob->gl_pathv ?
 655                     realloc((char *)pglob->gl_pathv, newsize) :
 656                     malloc(newsize);
 657         if (pathv == NULL)
 658                 return(GLOB_NOSPACE);
 659
 660         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 661                 /* first time around -- clear initial gl_offs items */
 662                 pathv += pglob->gl_offs;
 663                 for (i = pglob->gl_offs; --i >= 0; )
 664                         *--pathv = NULL;
 665         }
 666         pglob->gl_pathv = pathv;
 667
 668         for (p = path; *p++;)
 669                 continue;
 670         if ((copy = malloc(p - path)) != NULL) {
 671                 g_Ctoc(path, copy);
 672                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 673         }
 674         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 675         return(copy == NULL ? GLOB_NOSPACE : 0);
 676 }
 677
 678
 679 /*
 680  * pattern matching function for filenames.  Each occurrence of the *
 681  * pattern causes a recursion level.
 682  */
 683 static int
 684 match(name, pat, patend)
 685         register Char *name, *pat, *patend;
 686 {
 687         int ok, negate_range;
 688         Char c, k;
 689
 690         while (pat < patend) {
 691                 c = *pat++;
 692                 switch (c & M_MASK) {
 693                 case M_ALL:
 694                         if (pat == patend)
 695                                 return(1);
 696                         do
 697                             if (match(name, pat, patend))
 698                                     return(1);
 699                         while (*name++ != EOS);
 700                         return(0);
 701                 case M_ONE:
 702                         if (*name++ == EOS)
 703                                 return(0);
 704                         break;
 705                 case M_SET:
 706                         ok = 0;
 707                         if ((k = *name++) == EOS)
 708                                 return(0);
 709                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 710                                 ++pat;
 711                         while (((c = *pat++) & M_MASK) != M_END)
 712                                 if ((*pat & M_MASK) == M_RNG) {
 713                                         if (c <= k && k <= pat[1])
 714                                                 ok = 1;
 715                                         pat += 2;
 716                                 } else if (c == k)
 717                                         ok = 1;
 718                         if (ok == negate_range)
 719                                 return(0);
 720                         break;
 721                 default:
 722                         if (*name++ != c)
 723                                 return(0);
 724                         break;
 725                 }
 726         }
 727         return(*name == EOS);
 728 }
 729
 730 /* Free allocated data belonging to a glob_t structure. */
 731 void
 732 globfree(pglob)
 733         glob_t *pglob;
 734 {
 735         register int i;
 736         register char **pp;
 737
 738         if (pglob->gl_pathv != NULL) {
 739                 pp = pglob->gl_pathv + pglob->gl_offs;
 740                 for (i = pglob->gl_pathc; i--; ++pp)
 741                         if (*pp)
 742                                 free(*pp);
 743                 free(pglob->gl_pathv);
 744         }
 745 }
 746
 747 static DIR *
 748 g_opendir(str, pglob)
 749         register Char *str;
 750         glob_t *pglob;
 751 {
 752         char buf[MAXPATHLEN];
 753
 754         if (!*str)
 755                 strcpy(buf, ".");
 756         else
 757                 g_Ctoc(str, buf);
 758
 759         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 760                 return((*pglob->gl_opendir)(buf));
 761
 762         return(opendir(buf));
 763 }
 764
 765 static int
 766 g_lstat(fn, sb, pglob)
 767         register Char *fn;
 768         struct stat *sb;
 769         glob_t *pglob;
 770 {
 771         char buf[MAXPATHLEN];
 772
 773         g_Ctoc(fn, buf);
 774         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 775                 return((*pglob->gl_lstat)(buf, sb));
 776         return(lstat(buf, sb));
 777 }
 778
 779 static int
 780 g_stat(fn, sb, pglob)
 781         register Char *fn;
 782         struct stat *sb;
 783         glob_t *pglob;
 784 {
 785         char buf[MAXPATHLEN];
 786
 787         g_Ctoc(fn, buf);
 788         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 789                 return((*pglob->gl_stat)(buf, sb));
 790         return(stat(buf, sb));
 791 }
 792
 793 static Char *
 794 g_strchr(str, ch)
 795         Char *str;
 796         int ch;
 797 {
 798         do {
 799                 if (*str == ch)
 800                         return (str);
 801         } while (*str++);
 802         return (NULL);
 803 }
 804
 805 #ifdef notdef
 806 static Char *
 807 g_strcat(dst, src)
 808         Char *dst;
 809         const Char* src;
 810 {
 811         Char *sdst = dst;
 812
 813         while (*dst++)
 814                 continue;
 815         --dst;
 816         while((*dst++ = *src++) != EOS)
 817             continue;
 818
 819         return (sdst);
 820 }
 821 #endif
 822
 823 static void
 824 g_Ctoc(str, buf)
 825         register const Char *str;
 826         char *buf;
 827 {
 828         register char *dc;
 829
 830         for (dc = buf; (*dc++ = *str++) != EOS;)
 831                 continue;
 832 }
 833
 834 #ifdef DEBUG
 835 static void
 836 qprintf(str, s)
 837         const char *str;
 838         register Char *s;
 839 {
 840         register Char *p;
 841
 842         (void)printf("%s:\n", str);
 843         for (p = s; *p; p++)
 844                 (void)printf("%c", CHAR(*p));
 845         (void)printf("\n");
 846         for (p = s; *p; p++)
 847                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 848         (void)printf("\n");
 849         for (p = s; *p; p++)
 850                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 851         (void)printf("\n");
 852 }
 853 #endif