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