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  * $Id: compatglob.c,v 1.2 1999/10/11 13:31:10 stelian Exp $
  45  */
  46
  47 /*
  48  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  49  *
  50  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  51  *
  52  * Optional extra services, controlled by flags not defined by POSIX:
  53  *
  54  * GLOB_QUOTE:
  55  *      Escaping convention: \ inhibits any special meaning the following
  56  *      character might have (except \ at end of string is retained).
  57  * GLOB_MAGCHAR:
  58  *      Set in gl_flags if pattern contained a globbing character.
  59  * GLOB_NOMAGIC:
  60  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  61  *      not contain any magic characters.  [Used in csh style globbing]
  62  * GLOB_ALTDIRFUNC:
  63  *      Use alternately specified directory access functions.
  64  * GLOB_TILDE:
  65  *      expand ~user/foo to the /home/dir/of/user/foo
  66  * GLOB_BRACE:
  67  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  68  * gl_matchc:
  69  *      Number of matches in the current invocation of glob.
  70  */
  71
  72 #include <config.h>
  73
  74 #ifndef HAVE_GLOB
  75
  76 #include <sys/param.h>
  77 #include <sys/stat.h>
  78
  79 #include <ctype.h>
  80 #include <dirent.h>
  81 #include <errno.h>
  82 #include <compatglob.h>
  83 #include <pwd.h>
  84 #include <stdio.h>
  85 #include <stdlib.h>
  86 #include <string.h>
  87 #include <unistd.h>
  88
  89 #define DOLLAR          '$'
  90 #define DOT             '.'
  91 #define EOS             '\0'
  92 #define LBRACKET        '['
  93 #define NOT             '!'
  94 #define QUESTION        '?'
  95 #define QUOTE           '\\'
  96 #define RANGE           '-'
  97 #define RBRACKET        ']'
  98 #define SEP             '/'
  99 #define STAR            '*'
 100 #define TILDE           '~'
 101 #define UNDERSCORE      '_'
 102 #define LBRACE          '{'
 103 #define RBRACE          '}'
 104 #define SLASH           '/'
 105 #define COMMA           ','
 106
 107 #ifndef DEBUG
 108
 109 #define M_QUOTE         0x8000
 110 #define M_PROTECT       0x4000
 111 #define M_MASK          0xffff
 112 #define M_ASCII         0x00ff
 113
 114 typedef u_short Char;
 115
 116 #else
 117
 118 #define M_QUOTE         0x80
 119 #define M_PROTECT       0x40
 120 #define M_MASK          0xff
 121 #define M_ASCII         0x7f
 122
 123 typedef char Char;
 124
 125 #endif
 126
 127
 128 #define CHAR(c)         ((Char)((c)&M_ASCII))
 129 #define META(c)         ((Char)((c)|M_QUOTE))
 130 #define M_ALL           META('*')
 131 #define M_END           META(']')
 132 #define M_NOT           META('!')
 133 #define M_ONE           META('?')
 134 #define M_RNG           META('-')
 135 #define M_SET           META('[')
 136 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 137
 138
 139 static int       compare __P((const void *, const void *));
 140 static void      g_Ctoc __P((const Char *, char *));
 141 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 142 static DIR      *g_opendir __P((Char *, glob_t *));
 143 static Char     *g_strchr __P((Char *, int));
 144 #ifdef notdef
 145 static Char     *g_strcat __P((Char *, const Char *));
 146 #endif
 147 static int       g_stat __P((Char *, struct stat *, glob_t *));
 148 static int       glob0 __P((const Char *, glob_t *));
 149 static int       glob1 __P((Char *, glob_t *));
 150 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 151 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 152 static int       globextend __P((const Char *, glob_t *));
 153 static const Char *      globtilde __P((const Char *, Char *, size_t, glob_t *));
 154 static int       globexp1 __P((const Char *, glob_t *));
 155 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 156 static int       match __P((Char *, Char *, Char *));
 157 #ifdef DEBUG
 158 static void      qprintf __P((const char *, Char *));
 159 #endif
 160
 161 int
 162 glob(const char *pattern, int flags, int (*errfunc) __P((const char *, int)), 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(const Char *pattern, glob_t *pglob)
 211 {
 212         const Char* ptr = pattern;
 213         int rv;
 214
 215         /* Protect a single {}, for find(1), like csh */
 216         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 217                 return glob0(pattern, pglob);
 218
 219         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 220                 if (!globexp2(ptr, pattern, pglob, &rv))
 221                         return rv;
 222
 223         return glob0(pattern, pglob);
 224 }
 225
 226
 227 /*
 228  * Recursive brace globbing helper. Tries to expand a single brace.
 229  * If it succeeds then it invokes globexp1 with the new pattern.
 230  * If it fails then it tries to glob the rest of the pattern and returns.
 231  */
 232 static int globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 233 {
 234         int     i;
 235         Char   *lm, *ls;
 236         const Char *pe, *pm, *pl;
 237         Char    patbuf[MAXPATHLEN + 1];
 238
 239         /* copy part up to the brace */
 240         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 241                 continue;
 242         ls = lm;
 243
 244         /* Find the balanced brace */
 245         for (i = 0, pe = ++ptr; *pe; pe++)
 246                 if (*pe == LBRACKET) {
 247                         /* Ignore everything between [] */
 248                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 249                                 continue;
 250                         if (*pe == EOS) {
 251                                 /*
 252                                  * We could not find a matching RBRACKET.
 253                                  * Ignore and just look for RBRACE
 254                                  */
 255                                 pe = pm;
 256                         }
 257                 }
 258                 else if (*pe == LBRACE)
 259                         i++;
 260                 else if (*pe == RBRACE) {
 261                         if (i == 0)
 262                                 break;
 263                         i--;
 264                 }
 265
 266         /* Non matching braces; just glob the pattern */
 267         if (i != 0 || *pe == EOS) {
 268                 *rv = glob0(patbuf, pglob);
 269                 return 0;
 270         }
 271
 272         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 273                 switch (*pm) {
 274                 case LBRACKET:
 275                         /* Ignore everything between [] */
 276                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 277                                 continue;
 278                         if (*pm == EOS) {
 279                                 /*
 280                                  * We could not find a matching RBRACKET.
 281                                  * Ignore and just look for RBRACE
 282                                  */
 283                                 pm = pl;
 284                         }
 285                         break;
 286
 287                 case LBRACE:
 288                         i++;
 289                         break;
 290
 291                 case RBRACE:
 292                         if (i) {
 293                             i--;
 294                             break;
 295                         }
 296                         /* FALLTHROUGH */
 297                 case COMMA:
 298                         if (i && *pm == COMMA)
 299                                 break;
 300                         else {
 301                                 /* Append the current string */
 302                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 303                                         continue;
 304                                 /*
 305                                  * Append the rest of the pattern after the
 306                                  * closing brace
 307                                  */
 308                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 309                                         continue;
 310
 311                                 /* Expand the current pattern */
 312 #ifdef DEBUG
 313                                 qprintf("globexp2:", patbuf);
 314 #endif
 315                                 *rv = globexp1(patbuf, pglob);
 316
 317                                 /* move after the comma, to the next string */
 318                                 pl = pm + 1;
 319                         }
 320                         break;
 321
 322                 default:
 323                         break;
 324                 }
 325         *rv = 0;
 326         return 0;
 327 }
 328
 329
 330
 331 /*
 332  * expand tilde from the passwd file.
 333  */
 334 static const Char *
 335 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 336 {
 337         struct passwd *pwd;
 338         char *h;
 339         const Char *p;
 340         Char *b, *eb;
 341
 342         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 343                 return pattern;
 344
 345         /*
 346          * Copy up to the end of the string or /
 347          */
 348         eb = &patbuf[patbuf_len - 1];
 349         for (p = pattern + 1, h = (char *) patbuf;
 350             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 351                 continue;
 352
 353         *h = EOS;
 354
 355         if (((char *) patbuf)[0] == EOS) {
 356                 /*
 357                  * handle a plain ~ or ~/ by expanding $HOME first if
 358                  * we're not running setuid or setgid) and then trying
 359                  * the password file
 360                  */
 361                 if (
 362 #ifndef __linux__
 363 #ifndef __NETBSD_SYSCALLS
 364                     issetugid() != 0 ||
 365 #endif
 366 #endif
 367                     (h = getenv("HOME")) == NULL) {
 368                         if (((h = getlogin()) != NULL &&
 369                              (pwd = getpwnam(h)) != NULL) ||
 370                             (pwd = getpwuid(getuid())) != NULL)
 371                                 h = pwd->pw_dir;
 372                         else
 373                                 return pattern;
 374                 }
 375         }
 376         else {
 377                 /*
 378                  * Expand a ~user
 379                  */
 380                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 381                         return pattern;
 382                 else
 383                         h = pwd->pw_dir;
 384         }
 385
 386         /* Copy the home directory */
 387         for (b = patbuf; b < eb && *h; *b++ = *h++)
 388                 continue;
 389
 390         /* Append the rest of the pattern */
 391         while (b < eb && (*b++ = *p++) != EOS)
 392                 continue;
 393         *b = EOS;
 394
 395         return patbuf;
 396 }
 397
 398
 399 /*
 400  * The main glob() routine: compiles the pattern (optionally processing
 401  * quotes), calls glob1() to do the real pattern matching, and finally
 402  * sorts the list (unless unsorted operation is requested).  Returns 0
 403  * if things went well, nonzero if errors occurred.  It is not an error
 404  * to find no matches.
 405  */
 406 static int
 407 glob0(const Char *pattern, glob_t *pglob)
 408 {
 409         const Char *qpatnext;
 410         int c, err, oldpathc;
 411         Char *bufnext, patbuf[MAXPATHLEN+1];
 412
 413         qpatnext = globtilde(pattern, patbuf, sizeof(patbuf) / sizeof(Char),
 414             pglob);
 415         oldpathc = pglob->gl_pathc;
 416         bufnext = patbuf;
 417
 418         /* We don't need to check for buffer overflow any more. */
 419         while ((c = *qpatnext++) != EOS) {
 420                 switch (c) {
 421                 case LBRACKET:
 422                         c = *qpatnext;
 423                         if (c == NOT)
 424                                 ++qpatnext;
 425                         if (*qpatnext == EOS ||
 426                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 427                                 *bufnext++ = LBRACKET;
 428                                 if (c == NOT)
 429                                         --qpatnext;
 430                                 break;
 431                         }
 432                         *bufnext++ = M_SET;
 433                         if (c == NOT)
 434                                 *bufnext++ = M_NOT;
 435                         c = *qpatnext++;
 436                         do {
 437                                 *bufnext++ = CHAR(c);
 438                                 if (*qpatnext == RANGE &&
 439                                     (c = qpatnext[1]) != RBRACKET) {
 440                                         *bufnext++ = M_RNG;
 441                                         *bufnext++ = CHAR(c);
 442                                         qpatnext += 2;
 443                                 }
 444                         } while ((c = *qpatnext++) != RBRACKET);
 445                         pglob->gl_flags |= GLOB_MAGCHAR;
 446                         *bufnext++ = M_END;
 447                         break;
 448                 case QUESTION:
 449                         pglob->gl_flags |= GLOB_MAGCHAR;
 450                         *bufnext++ = M_ONE;
 451                         break;
 452                 case STAR:
 453                         pglob->gl_flags |= GLOB_MAGCHAR;
 454                         /* collapse adjacent stars to one,
 455                          * to avoid exponential behavior
 456                          */
 457                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 458                             *bufnext++ = M_ALL;
 459                         break;
 460                 default:
 461                         *bufnext++ = CHAR(c);
 462                         break;
 463                 }
 464         }
 465         *bufnext = EOS;
 466 #ifdef DEBUG
 467         qprintf("glob0:", patbuf);
 468 #endif
 469
 470         if ((err = glob1(patbuf, pglob)) != 0)
 471                 return(err);
 472
 473         /*
 474          * If there was no match we are going to append the pattern
 475          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 476          * and the pattern did not contain any magic characters
 477          * GLOB_NOMAGIC is there just for compatibility with csh.
 478          */
 479         if (pglob->gl_pathc == oldpathc &&
 480             ((pglob->gl_flags & GLOB_NOCHECK) ||
 481               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 482                !(pglob->gl_flags & GLOB_MAGCHAR))))
 483                 return(globextend(pattern, pglob));
 484         else if (!(pglob->gl_flags & GLOB_NOSORT))
 485                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 486                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 487         return(0);
 488 }
 489
 490 static int
 491 compare(const void *p, const void *q)
 492 {
 493         return(strcmp(*(char **)p, *(char **)q));
 494 }
 495
 496 static int
 497 glob1(Char *pattern, glob_t *pglob)
 498 {
 499         Char pathbuf[MAXPATHLEN+1];
 500
 501         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 502         if (*pattern == EOS)
 503                 return(0);
 504         return(glob2(pathbuf, pathbuf, pattern, pglob));
 505 }
 506
 507 /*
 508  * The functions glob2 and glob3 are mutually recursive; there is one level
 509  * of recursion for each segment in the pattern that contains one or more
 510  * meta characters.
 511  */
 512 static int
 513 glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob)
 514 {
 515         struct stat sb;
 516         Char *p, *q;
 517         int anymeta;
 518
 519         /*
 520          * Loop over pattern segments until end of pattern or until
 521          * segment with meta character found.
 522          */
 523         for (anymeta = 0;;) {
 524                 if (*pattern == EOS) {          /* End of pattern? */
 525                         *pathend = EOS;
 526                         if (g_lstat(pathbuf, &sb, pglob))
 527                                 return(0);
 528
 529                         if (((pglob->gl_flags & GLOB_MARK) &&
 530                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 531                             || (S_ISLNK(sb.st_mode) &&
 532                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 533                             S_ISDIR(sb.st_mode)))) {
 534                                 *pathend++ = SEP;
 535                                 *pathend = EOS;
 536                         }
 537                         ++pglob->gl_matchc;
 538                         return(globextend(pathbuf, pglob));
 539                 }
 540
 541                 /* Find end of next segment, copy tentatively to pathend. */
 542                 q = pathend;
 543                 p = pattern;
 544                 while (*p != EOS && *p != SEP) {
 545                         if (ismeta(*p))
 546                                 anymeta = 1;
 547                         *q++ = *p++;
 548                 }
 549
 550                 if (!anymeta) {         /* No expansion, do next segment. */
 551                         pathend = q;
 552                         pattern = p;
 553                         while (*pattern == SEP)
 554                                 *pathend++ = *pattern++;
 555                 } else                  /* Need expansion, recurse. */
 556                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 557         }
 558         /* NOTREACHED */
 559 }
 560
 561 static int
 562 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern, glob_t *pglob)
 563 {
 564         register struct dirent *dp;
 565         DIR *dirp;
 566         int err;
 567         char buf[MAXPATHLEN];
 568
 569         /*
 570          * The readdirfunc declaration can't be prototyped, because it is
 571          * assigned, below, to two functions which are prototyped in glob.h
 572          * and dirent.h as taking pointers to differently typed opaque
 573          * structures.
 574          */
 575         struct dirent *(*readdirfunc)();
 576
 577         *pathend = EOS;
 578         errno = 0;
 579
 580         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 581                 /* TODO: don't call for ENOENT or ENOTDIR? */
 582                 if (pglob->gl_errfunc) {
 583                         g_Ctoc(pathbuf, buf);
 584                         if (pglob->gl_errfunc(buf, errno) ||
 585                             pglob->gl_flags & GLOB_ERR)
 586                                 return (GLOB_ABEND);
 587                 }
 588                 return(0);
 589         }
 590
 591         err = 0;
 592
 593         /* Search directory for matching names. */
 594         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 595                 readdirfunc = pglob->gl_readdir;
 596         else
 597                 readdirfunc = readdir;
 598         while ((dp = (*readdirfunc)(dirp))) {
 599                 register u_char *sc;
 600                 register Char *dc;
 601
 602                 /* Initial DOT must be matched literally. */
 603                 if (dp->d_name[0] == DOT && *pattern != DOT)
 604                         continue;
 605                 for (sc = (u_char *) dp->d_name, dc = pathend;
 606                      (*dc++ = *sc++) != EOS;)
 607                         continue;
 608                 if (!match(pathend, pattern, restpattern)) {
 609                         *pathend = EOS;
 610                         continue;
 611                 }
 612                 err = glob2(pathbuf, --dc, restpattern, pglob);
 613                 if (err)
 614                         break;
 615         }
 616
 617         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 618                 (*pglob->gl_closedir)(dirp);
 619         else
 620                 closedir(dirp);
 621         return(err);
 622 }
 623
 624
 625 /*
 626  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 627  * add the new item, and update gl_pathc.
 628  *
 629  * This assumes the BSD realloc, which only copies the block when its size
 630  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 631  * behavior.
 632  *
 633  * Return 0 if new item added, error code if memory couldn't be allocated.
 634  *
 635  * Invariant of the glob_t structure:
 636  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 637  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 638  */
 639 static int
 640 globextend(const Char *path, glob_t *pglob)
 641 {
 642         register char **pathv;
 643         register int i;
 644         u_int newsize;
 645         char *copy;
 646         const Char *p;
 647
 648         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 649         pathv = pglob->gl_pathv ?
 650                     realloc((char *)pglob->gl_pathv, newsize) :
 651                     malloc(newsize);
 652         if (pathv == NULL)
 653                 return(GLOB_NOSPACE);
 654
 655         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 656                 /* first time around -- clear initial gl_offs items */
 657                 pathv += pglob->gl_offs;
 658                 for (i = pglob->gl_offs; --i >= 0; )
 659                         *--pathv = NULL;
 660         }
 661         pglob->gl_pathv = pathv;
 662
 663         for (p = path; *p++;)
 664                 continue;
 665         if ((copy = malloc(p - path)) != NULL) {
 666                 g_Ctoc(path, copy);
 667                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 668         }
 669         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 670         return(copy == NULL ? GLOB_NOSPACE : 0);
 671 }
 672
 673 /*
 674  * pattern matching function for filenames.  Each occurrence of the *
 675  * pattern causes a recursion level.
 676  */
 677 static int
 678 match(Char *name, Char *pat, Char *patend)
 679 {
 680         int ok, negate_range;
 681         Char c, k;
 682
 683         while (pat < patend) {
 684                 c = *pat++;
 685                 switch (c & M_MASK) {
 686                 case M_ALL:
 687                         if (pat == patend)
 688                                 return(1);
 689                         do
 690                             if (match(name, pat, patend))
 691                                     return(1);
 692                         while (*name++ != EOS);
 693                         return(0);
 694                 case M_ONE:
 695                         if (*name++ == EOS)
 696                                 return(0);
 697                         break;
 698                 case M_SET:
 699                         ok = 0;
 700                         if ((k = *name++) == EOS)
 701                                 return(0);
 702                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 703                                 ++pat;
 704                         while (((c = *pat++) & M_MASK) != M_END)
 705                                 if ((*pat & M_MASK) == M_RNG) {
 706                                         if (c <= k && k <= pat[1])
 707                                                 ok = 1;
 708                                         pat += 2;
 709                                 } else if (c == k)
 710                                         ok = 1;
 711                         if (ok == negate_range)
 712                                 return(0);
 713                         break;
 714                 default:
 715                         if (*name++ != c)
 716                                 return(0);
 717                         break;
 718                 }
 719         }
 720         return(*name == EOS);
 721 }
 722
 723 /* Free allocated data belonging to a glob_t structure. */
 724 void
 725 globfree(glob_t *pglob)
 726 {
 727         register int i;
 728         register char **pp;
 729
 730         if (pglob->gl_pathv != NULL) {
 731                 pp = pglob->gl_pathv + pglob->gl_offs;
 732                 for (i = pglob->gl_pathc; i--; ++pp)
 733                         if (*pp)
 734                                 free(*pp);
 735                 free(pglob->gl_pathv);
 736         }
 737 }
 738
 739 static DIR *
 740 g_opendir(Char *str, glob_t *pglob)
 741 {
 742         char buf[MAXPATHLEN];
 743
 744         if (!*str)
 745                 strcpy(buf, ".");
 746         else
 747                 g_Ctoc(str, buf);
 748
 749         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 750                 return((*pglob->gl_opendir)(buf));
 751
 752         return(opendir(buf));
 753 }
 754
 755 static int
 756 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 757 {
 758         char buf[MAXPATHLEN];
 759
 760         g_Ctoc(fn, buf);
 761         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 762                 return((*pglob->gl_lstat)(buf, sb));
 763         return(lstat(buf, sb));
 764 }
 765
 766 static int
 767 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 768 {
 769         char buf[MAXPATHLEN];
 770
 771         g_Ctoc(fn, buf);
 772         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 773                 return((*pglob->gl_stat)(buf, sb));
 774         return(stat(buf, sb));
 775 }
 776
 777 static Char *
 778 g_strchr(Char *str, int ch)
 779 {
 780         do {
 781                 if (*str == ch)
 782                         return (str);
 783         } while (*str++);
 784         return (NULL);
 785 }
 786
 787 #ifdef notdef
 788 static Char *
 789 g_strcat(Char *dst, const Char *src)
 790 {
 791         Char *sdst = dst;
 792
 793         while (*dst++)
 794                 continue;
 795         --dst;
 796         while((*dst++ = *src++) != EOS)
 797             continue;
 798
 799         return (sdst);
 800 }
 801 #endif
 802
 803 static void
 804 g_Ctoc(const Char *str, char *buf)
 805 {
 806         register char *dc;
 807
 808         for (dc = buf; (*dc++ = *str++) != EOS;)
 809                 continue;
 810 }
 811
 812 #ifdef DEBUG
 813 static void
 814 qprintf(const char *str, Char *s)
 815 {
 816         register Char *p;
 817
 818         (void)printf("%s:\n", str);
 819         for (p = s; *p; p++)
 820                 (void)printf("%c", CHAR(*p));
 821         (void)printf("\n");
 822         for (p = s; *p; p++)
 823                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 824         (void)printf("\n");
 825         for (p = s; *p; p++)
 826                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 827         (void)printf("\n");
 828 }
 829 #endif
 830
 831 #endif /* ! HAVE_GLOB */