compat/lib/compatglob.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>, 1994-1997
   5  *      Stelian Pop <stelian@popies.net>, 1999-2000
   6  *      Stelian Pop <stelian@popies.net> - Alcôve <www.alcove.com>, 2000-2002
   7  */
   8
   9 /*
  10  * Copyright (c) 1989, 1993
  11  *      The Regents of the University of California.  All rights reserved.
  12  *
  13  * This code is derived from software contributed to Berkeley by
  14  * Guido van Rossum.
  15  *
  16  * Redistribution and use in source and binary forms, with or without
  17  * modification, are permitted provided that the following conditions
  18  * are met:
  19  * 1. Redistributions of source code must retain the above copyright
  20  *    notice, this list of conditions and the following disclaimer.
  21  * 2. Redistributions in binary form must reproduce the above copyright
  22  *    notice, this list of conditions and the following disclaimer in the
  23  *    documentation and/or other materials provided with the distribution.
  24  * 3. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  */
  40
  41 /*
  42  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  43  *
  44  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  45  *
  46  * Optional extra services, controlled by flags not defined by POSIX:
  47  *
  48  * GLOB_QUOTE:
  49  *      Escaping convention: \ inhibits any special meaning the following
  50  *      character might have (except \ at end of string is retained).
  51  * GLOB_MAGCHAR:
  52  *      Set in gl_flags if pattern contained a globbing character.
  53  * GLOB_NOMAGIC:
  54  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  55  *      not contain any magic characters.  [Used in csh style globbing]
  56  * GLOB_ALTDIRFUNC:
  57  *      Use alternately specified directory access functions.
  58  * GLOB_TILDE:
  59  *      expand ~user/foo to the /home/dir/of/user/foo
  60  * GLOB_BRACE:
  61  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  62  * gl_matchc:
  63  *      Number of matches in the current invocation of glob.
  64  */
  65
  66 #ifndef lint
  67 static const char rcsid[] =
  68         "$Id: compatglob.c,v 1.9 2003/03/30 15:40:35 stelian Exp $";
  69 #endif /* not lint */
  70
  71 #include <config.h>
  72
  73 #ifndef HAVE_GLOB
  74
  75 #include <sys/param.h>
  76 #include <sys/stat.h>
  77
  78 #include <ctype.h>
  79 #include <dirent.h>
  80 #include <errno.h>
  81 #include <compatglob.h>
  82 #include <pwd.h>
  83 #include <stdio.h>
  84 #include <stdlib.h>
  85 #include <string.h>
  86 #include <unistd.h>
  87
  88 #define DOLLAR          '$'
  89 #define DOT             '.'
  90 #define EOS             '\0'
  91 #define LBRACKET        '['
  92 #define NOT             '!'
  93 #define QUESTION        '?'
  94 #define QUOTE           '\\'
  95 #define RANGE           '-'
  96 #define RBRACKET        ']'
  97 #define SEP             '/'
  98 #define STAR            '*'
  99 #define TILDE           '~'
 100 #define UNDERSCORE      '_'
 101 #define LBRACE          '{'
 102 #define RBRACE          '}'
 103 #define SLASH           '/'
 104 #define COMMA           ','
 105
 106 #ifndef DEBUG
 107
 108 #define M_QUOTE         0x8000
 109 #define M_PROTECT       0x4000
 110 #define M_MASK          0xffff
 111 #define M_ASCII         0x00ff
 112
 113 typedef u_short Char;
 114
 115 #else
 116
 117 #define M_QUOTE         0x80
 118 #define M_PROTECT       0x40
 119 #define M_MASK          0xff
 120 #define M_ASCII         0x7f
 121
 122 typedef char Char;
 123
 124 #endif
 125
 126
 127 #define CHAR(c)         ((Char)((c)&M_ASCII))
 128 #define META(c)         ((Char)((c)|M_QUOTE))
 129 #define M_ALL           META('*')
 130 #define M_END           META(']')
 131 #define M_NOT           META('!')
 132 #define M_ONE           META('?')
 133 #define M_RNG           META('-')
 134 #define M_SET           META('[')
 135 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 136
 137
 138 static int       compare __P((const void *, const void *));
 139 static void      g_Ctoc __P((const Char *, char *));
 140 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 141 static DIR      *g_opendir __P((Char *, glob_t *));
 142 static Char     *g_strchr __P((Char *, int));
 143 #ifdef notdef
 144 static Char     *g_strcat __P((Char *, const Char *));
 145 #endif
 146 static int       g_stat __P((Char *, struct stat *, glob_t *));
 147 static int       glob0 __P((const Char *, glob_t *));
 148 static int       glob1 __P((Char *, glob_t *));
 149 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 150 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 151 static int       globextend __P((const Char *, glob_t *));
 152 static const Char *      globtilde __P((const Char *, Char *, size_t, glob_t *));
 153 static int       globexp1 __P((const Char *, glob_t *));
 154 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 155 static int       match __P((Char *, Char *, Char *));
 156 #ifdef DEBUG
 157 static void      qprintf __P((const char *, Char *));
 158 #endif
 159
 160 int
 161 glob(const char *pattern, int flags, int (*errfunc) __P((const char *, int)), glob_t *pglob)
 162 {
 163         const u_char *patnext;
 164         int c;
 165         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 166
 167         patnext = (u_char *) pattern;
 168         if (!(flags & GLOB_APPEND)) {
 169                 pglob->gl_pathc = 0;
 170                 pglob->gl_pathv = NULL;
 171                 if (!(flags & GLOB_DOOFFS))
 172                         pglob->gl_offs = 0;
 173         }
 174         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 175         pglob->gl_errfunc = errfunc;
 176         pglob->gl_matchc = 0;
 177
 178         bufnext = patbuf;
 179         bufend = bufnext + MAXPATHLEN;
 180         if (flags & GLOB_QUOTE) {
 181                 /* Protect the quoted characters. */
 182                 while (bufnext < bufend && (c = *patnext++) != EOS)
 183                         if (c == QUOTE) {
 184                                 if ((c = *patnext++) == EOS) {
 185                                         c = QUOTE;
 186                                         --patnext;
 187                                 }
 188                                 *bufnext++ = c | M_PROTECT;
 189                         }
 190                         else
 191                                 *bufnext++ = c;
 192         }
 193         else
 194             while (bufnext < bufend && (c = *patnext++) != EOS)
 195                     *bufnext++ = c;
 196         *bufnext = EOS;
 197
 198         if (flags & GLOB_BRACE)
 199             return globexp1(patbuf, pglob);
 200         else
 201             return glob0(patbuf, pglob);
 202 }
 203
 204 /*
 205  * Expand recursively a glob {} pattern. When there is no more expansion
 206  * invoke the standard globbing routine to glob the rest of the magic
 207  * characters
 208  */
 209 static int globexp1(const Char *pattern, glob_t *pglob)
 210 {
 211         const Char* ptr = pattern;
 212         int rv;
 213
 214         /* Protect a single {}, for find(1), like csh */
 215         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 216                 return glob0(pattern, pglob);
 217
 218         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 219                 if (!globexp2(ptr, pattern, pglob, &rv))
 220                         return rv;
 221
 222         return glob0(pattern, pglob);
 223 }
 224
 225
 226 /*
 227  * Recursive brace globbing helper. Tries to expand a single brace.
 228  * If it succeeds then it invokes globexp1 with the new pattern.
 229  * If it fails then it tries to glob the rest of the pattern and returns.
 230  */
 231 static int globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 232 {
 233         int     i;
 234         Char   *lm, *ls;
 235         const Char *pe, *pm, *pl;
 236         Char    patbuf[MAXPATHLEN + 1];
 237
 238         /* copy part up to the brace */
 239         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 240                 continue;
 241         ls = lm;
 242
 243         /* Find the balanced brace */
 244         for (i = 0, pe = ++ptr; *pe; pe++)
 245                 if (*pe == LBRACKET) {
 246                         /* Ignore everything between [] */
 247                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 248                                 continue;
 249                         if (*pe == EOS) {
 250                                 /*
 251                                  * We could not find a matching RBRACKET.
 252                                  * Ignore and just look for RBRACE
 253                                  */
 254                                 pe = pm;
 255                         }
 256                 }
 257                 else if (*pe == LBRACE)
 258                         i++;
 259                 else if (*pe == RBRACE) {
 260                         if (i == 0)
 261                                 break;
 262                         i--;
 263                 }
 264
 265         /* Non matching braces; just glob the pattern */
 266         if (i != 0 || *pe == EOS) {
 267                 *rv = glob0(patbuf, pglob);
 268                 return 0;
 269         }
 270
 271         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 272                 switch (*pm) {
 273                 case LBRACKET:
 274                         /* Ignore everything between [] */
 275                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 276                                 continue;
 277                         if (*pm == EOS) {
 278                                 /*
 279                                  * We could not find a matching RBRACKET.
 280                                  * Ignore and just look for RBRACE
 281                                  */
 282                                 pm = pl;
 283                         }
 284                         break;
 285
 286                 case LBRACE:
 287                         i++;
 288                         break;
 289
 290                 case RBRACE:
 291                         if (i) {
 292                             i--;
 293                             break;
 294                         }
 295                         /* FALLTHROUGH */
 296                 case COMMA:
 297                         if (i && *pm == COMMA)
 298                                 break;
 299                         else {
 300                                 /* Append the current string */
 301                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 302                                         continue;
 303                                 /*
 304                                  * Append the rest of the pattern after the
 305                                  * closing brace
 306                                  */
 307                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 308                                         continue;
 309
 310                                 /* Expand the current pattern */
 311 #ifdef DEBUG
 312                                 qprintf("globexp2:", patbuf);
 313 #endif
 314                                 *rv = globexp1(patbuf, pglob);
 315
 316                                 /* move after the comma, to the next string */
 317                                 pl = pm + 1;
 318                         }
 319                         break;
 320
 321                 default:
 322                         break;
 323                 }
 324         *rv = 0;
 325         return 0;
 326 }
 327
 328
 329
 330 /*
 331  * expand tilde from the passwd file.
 332  */
 333 static const Char *
 334 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 335 {
 336         struct passwd *pwd;
 337         char *h;
 338         const Char *p;
 339         Char *b, *eb;
 340
 341         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 342                 return pattern;
 343
 344         /*
 345          * Copy up to the end of the string or /
 346          */
 347         eb = &patbuf[patbuf_len - 1];
 348         for (p = pattern + 1, h = (char *) patbuf;
 349             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 350                 continue;
 351
 352         *h = EOS;
 353
 354         if (((char *) patbuf)[0] == EOS) {
 355                 /*
 356                  * handle a plain ~ or ~/ by expanding $HOME first if
 357                  * we're not running setuid or setgid) and then trying
 358                  * the password file
 359                  */
 360                 if (
 361 #ifndef __linux__
 362 #ifndef __NETBSD_SYSCALLS
 363                     issetugid() != 0 ||
 364 #endif
 365 #endif
 366                     (h = getenv("HOME")) == NULL) {
 367                         if (((h = getlogin()) != NULL &&
 368                              (pwd = getpwnam(h)) != NULL) ||
 369                             (pwd = getpwuid(getuid())) != NULL)
 370                                 h = pwd->pw_dir;
 371                         else
 372                                 return pattern;
 373                 }
 374         }
 375         else {
 376                 /*
 377                  * Expand a ~user
 378                  */
 379                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 380                         return pattern;
 381                 else
 382                         h = pwd->pw_dir;
 383         }
 384
 385         /* Copy the home directory */
 386         for (b = patbuf; b < eb && *h; *b++ = *h++)
 387                 continue;
 388
 389         /* Append the rest of the pattern */
 390         while (b < eb && (*b++ = *p++) != EOS)
 391                 continue;
 392         *b = EOS;
 393
 394         return patbuf;
 395 }
 396
 397
 398 /*
 399  * The main glob() routine: compiles the pattern (optionally processing
 400  * quotes), calls glob1() to do the real pattern matching, and finally
 401  * sorts the list (unless unsorted operation is requested).  Returns 0
 402  * if things went well, nonzero if errors occurred.  It is not an error
 403  * to find no matches.
 404  */
 405 static int
 406 glob0(const Char *pattern, glob_t *pglob)
 407 {
 408         const Char *qpatnext;
 409         int c, err, oldpathc;
 410         Char *bufnext, patbuf[MAXPATHLEN+1];
 411
 412         qpatnext = globtilde(pattern, patbuf, sizeof(patbuf) / sizeof(Char),
 413             pglob);
 414         oldpathc = pglob->gl_pathc;
 415         bufnext = patbuf;
 416
 417         /* We don't need to check for buffer overflow any more. */
 418         while ((c = *qpatnext++) != EOS) {
 419                 switch (c) {
 420                 case LBRACKET:
 421                         c = *qpatnext;
 422                         if (c == NOT)
 423                                 ++qpatnext;
 424                         if (*qpatnext == EOS ||
 425                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 426                                 *bufnext++ = LBRACKET;
 427                                 if (c == NOT)
 428                                         --qpatnext;
 429                                 break;
 430                         }
 431                         *bufnext++ = M_SET;
 432                         if (c == NOT)
 433                                 *bufnext++ = M_NOT;
 434                         c = *qpatnext++;
 435                         do {
 436                                 *bufnext++ = CHAR(c);
 437                                 if (*qpatnext == RANGE &&
 438                                     (c = qpatnext[1]) != RBRACKET) {
 439                                         *bufnext++ = M_RNG;
 440                                         *bufnext++ = CHAR(c);
 441                                         qpatnext += 2;
 442                                 }
 443                         } while ((c = *qpatnext++) != RBRACKET);
 444                         pglob->gl_flags |= GLOB_MAGCHAR;
 445                         *bufnext++ = M_END;
 446                         break;
 447                 case QUESTION:
 448                         pglob->gl_flags |= GLOB_MAGCHAR;
 449                         *bufnext++ = M_ONE;
 450                         break;
 451                 case STAR:
 452                         pglob->gl_flags |= GLOB_MAGCHAR;
 453                         /* collapse adjacent stars to one,
 454                          * to avoid exponential behavior
 455                          */
 456                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 457                             *bufnext++ = M_ALL;
 458                         break;
 459                 default:
 460                         *bufnext++ = CHAR(c);
 461                         break;
 462                 }
 463         }
 464         *bufnext = EOS;
 465 #ifdef DEBUG
 466         qprintf("glob0:", patbuf);
 467 #endif
 468
 469         if ((err = glob1(patbuf, pglob)) != 0)
 470                 return(err);
 471
 472         /*
 473          * If there was no match we are going to append the pattern
 474          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 475          * and the pattern did not contain any magic characters
 476          * GLOB_NOMAGIC is there just for compatibility with csh.
 477          */
 478         if (pglob->gl_pathc == oldpathc &&
 479             ((pglob->gl_flags & GLOB_NOCHECK) ||
 480               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 481                !(pglob->gl_flags & GLOB_MAGCHAR))))
 482                 return(globextend(pattern, pglob));
 483         else if (!(pglob->gl_flags & GLOB_NOSORT))
 484                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 485                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 486         return(0);
 487 }
 488
 489 static int
 490 compare(const void *p, const void *q)
 491 {
 492         return(strcmp(*(char **)p, *(char **)q));
 493 }
 494
 495 static int
 496 glob1(Char *pattern, 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(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob)
 513 {
 514         struct stat sb;
 515         Char *p, *q;
 516         int anymeta;
 517
 518         /*
 519          * Loop over pattern segments until end of pattern or until
 520          * segment with meta character found.
 521          */
 522         for (anymeta = 0;;) {
 523                 if (*pattern == EOS) {          /* End of pattern? */
 524                         *pathend = EOS;
 525                         if (g_lstat(pathbuf, &sb, pglob))
 526                                 return(0);
 527
 528                         if (((pglob->gl_flags & GLOB_MARK) &&
 529                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 530                             || (S_ISLNK(sb.st_mode) &&
 531                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 532                             S_ISDIR(sb.st_mode)))) {
 533                                 *pathend++ = SEP;
 534                                 *pathend = EOS;
 535                         }
 536                         ++pglob->gl_matchc;
 537                         return(globextend(pathbuf, pglob));
 538                 }
 539
 540                 /* Find end of next segment, copy tentatively to pathend. */
 541                 q = pathend;
 542                 p = pattern;
 543                 while (*p != EOS && *p != SEP) {
 544                         if (ismeta(*p))
 545                                 anymeta = 1;
 546                         *q++ = *p++;
 547                 }
 548
 549                 if (!anymeta) {         /* No expansion, do next segment. */
 550                         pathend = q;
 551                         pattern = p;
 552                         while (*pattern == SEP)
 553                                 *pathend++ = *pattern++;
 554                 } else                  /* Need expansion, recurse. */
 555                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 556         }
 557         /* NOTREACHED */
 558 }
 559
 560 static int
 561 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern, glob_t *pglob)
 562 {
 563         struct dirent *dp;
 564         DIR *dirp;
 565         int err;
 566         char buf[MAXPATHLEN];
 567
 568         /*
 569          * The readdirfunc declaration can't be prototyped, because it is
 570          * assigned, below, to two functions which are prototyped in glob.h
 571          * and dirent.h as taking pointers to differently typed opaque
 572          * structures.
 573          */
 574         struct dirent *(*readdirfunc)();
 575
 576         *pathend = EOS;
 577         errno = 0;
 578
 579         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 580                 /* TODO: don't call for ENOENT or ENOTDIR? */
 581                 if (pglob->gl_errfunc) {
 582                         g_Ctoc(pathbuf, buf);
 583                         if (pglob->gl_errfunc(buf, errno) ||
 584                             pglob->gl_flags & GLOB_ERR)
 585                                 return (GLOB_ABEND);
 586                 }
 587                 return(0);
 588         }
 589
 590         err = 0;
 591
 592         /* Search directory for matching names. */
 593         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 594                 readdirfunc = pglob->gl_readdir;
 595         else
 596                 readdirfunc = readdir;
 597         while ((dp = (*readdirfunc)(dirp))) {
 598                 u_char *sc;
 599                 Char *dc;
 600
 601                 /* Initial DOT must be matched literally. */
 602                 if (dp->d_name[0] == DOT && *pattern != DOT)
 603                         continue;
 604                 for (sc = (u_char *) dp->d_name, dc = pathend;
 605                      (*dc++ = *sc++) != EOS;)
 606                         continue;
 607                 if (!match(pathend, pattern, restpattern)) {
 608                         *pathend = EOS;
 609                         continue;
 610                 }
 611                 err = glob2(pathbuf, --dc, restpattern, pglob);
 612                 if (err)
 613                         break;
 614         }
 615
 616         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 617                 (*pglob->gl_closedir)(dirp);
 618         else
 619                 closedir(dirp);
 620         return(err);
 621 }
 622
 623
 624 /*
 625  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 626  * add the new item, and update gl_pathc.
 627  *
 628  * This assumes the BSD realloc, which only copies the block when its size
 629  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 630  * behavior.
 631  *
 632  * Return 0 if new item added, error code if memory couldn't be allocated.
 633  *
 634  * Invariant of the glob_t structure:
 635  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 636  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 637  */
 638 static int
 639 globextend(const Char *path, glob_t *pglob)
 640 {
 641         char **pathv;
 642         int i;
 643         u_int newsize;
 644         char *copy;
 645         const Char *p;
 646
 647         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 648         pathv = pglob->gl_pathv ?
 649                     realloc((char *)pglob->gl_pathv, newsize) :
 650                     malloc(newsize);
 651         if (pathv == NULL)
 652                 return(GLOB_NOSPACE);
 653
 654         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 655                 /* first time around -- clear initial gl_offs items */
 656                 pathv += pglob->gl_offs;
 657                 for (i = pglob->gl_offs; --i >= 0; )
 658                         *--pathv = NULL;
 659         }
 660         pglob->gl_pathv = pathv;
 661
 662         for (p = path; *p++;)
 663                 continue;
 664         if ((copy = malloc(p - path)) != NULL) {
 665                 g_Ctoc(path, copy);
 666                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 667         }
 668         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 669         return(copy == NULL ? GLOB_NOSPACE : 0);
 670 }
 671
 672 /*
 673  * pattern matching function for filenames.  Each occurrence of the *
 674  * pattern causes a recursion level.
 675  */
 676 static int
 677 match(Char *name, Char *pat, Char *patend)
 678 {
 679         int ok, negate_range;
 680         Char c, k;
 681
 682         while (pat < patend) {
 683                 c = *pat++;
 684                 switch (c & M_MASK) {
 685                 case M_ALL:
 686                         if (pat == patend)
 687                                 return(1);
 688                         do
 689                             if (match(name, pat, patend))
 690                                     return(1);
 691                         while (*name++ != EOS);
 692                         return(0);
 693                 case M_ONE:
 694                         if (*name++ == EOS)
 695                                 return(0);
 696                         break;
 697                 case M_SET:
 698                         ok = 0;
 699                         if ((k = *name++) == EOS)
 700                                 return(0);
 701                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 702                                 ++pat;
 703                         while (((c = *pat++) & M_MASK) != M_END)
 704                                 if ((*pat & M_MASK) == M_RNG) {
 705                                         if (c <= k && k <= pat[1])
 706                                                 ok = 1;
 707                                         pat += 2;
 708                                 } else if (c == k)
 709                                         ok = 1;
 710                         if (ok == negate_range)
 711                                 return(0);
 712                         break;
 713                 default:
 714                         if (*name++ != c)
 715                                 return(0);
 716                         break;
 717                 }
 718         }
 719         return(*name == EOS);
 720 }
 721
 722 /* Free allocated data belonging to a glob_t structure. */
 723 void
 724 globfree(glob_t *pglob)
 725 {
 726         int i;
 727         char **pp;
 728
 729         if (pglob->gl_pathv != NULL) {
 730                 pp = pglob->gl_pathv + pglob->gl_offs;
 731                 for (i = pglob->gl_pathc; i--; ++pp)
 732                         if (*pp)
 733                                 free(*pp);
 734                 free(pglob->gl_pathv);
 735         }
 736 }
 737
 738 static DIR *
 739 g_opendir(Char *str, glob_t *pglob)
 740 {
 741         char buf[MAXPATHLEN];
 742
 743         if (!*str)
 744                 strcpy(buf, ".");
 745         else
 746                 g_Ctoc(str, buf);
 747
 748         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 749                 return((*pglob->gl_opendir)(buf));
 750
 751         return(opendir(buf));
 752 }
 753
 754 static int
 755 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 756 {
 757         char buf[MAXPATHLEN];
 758
 759         g_Ctoc(fn, buf);
 760         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 761                 return((*pglob->gl_lstat)(buf, sb));
 762         return(lstat(buf, sb));
 763 }
 764
 765 static int
 766 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 767 {
 768         char buf[MAXPATHLEN];
 769
 770         g_Ctoc(fn, buf);
 771         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 772                 return((*pglob->gl_stat)(buf, sb));
 773         return(stat(buf, sb));
 774 }
 775
 776 static Char *
 777 g_strchr(Char *str, int ch)
 778 {
 779         do {
 780                 if (*str == ch)
 781                         return (str);
 782         } while (*str++);
 783         return (NULL);
 784 }
 785
 786 #ifdef notdef
 787 static Char *
 788 g_strcat(Char *dst, const Char *src)
 789 {
 790         Char *sdst = dst;
 791
 792         while (*dst++)
 793                 continue;
 794         --dst;
 795         while((*dst++ = *src++) != EOS)
 796             continue;
 797
 798         return (sdst);
 799 }
 800 #endif
 801
 802 static void
 803 g_Ctoc(const Char *str, char *buf)
 804 {
 805         char *dc;
 806
 807         for (dc = buf; (*dc++ = *str++) != EOS;)
 808                 continue;
 809 }
 810
 811 #ifdef DEBUG
 812 static void
 813 qprintf(const char *str, Char *s)
 814 {
 815         Char *p;
 816
 817         (void)printf("%s:\n", str);
 818         for (p = s; *p; p++)
 819                 (void)printf("%c", CHAR(*p));
 820         (void)printf("\n");
 821         for (p = s; *p; p++)
 822                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 823         (void)printf("\n");
 824         for (p = s; *p; p++)
 825                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 826         (void)printf("\n");
 827 }
 828 #endif
 829
 830 #endif /* ! HAVE_GLOB */