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. 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 /*
  46  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  47  *
  48  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  49  *
  50  * Optional extra services, controlled by flags not defined by POSIX:
  51  *
  52  * GLOB_QUOTE:
  53  *      Escaping convention: \ inhibits any special meaning the following
  54  *      character might have (except \ at end of string is retained).
  55  * GLOB_MAGCHAR:
  56  *      Set in gl_flags if pattern contained a globbing character.
  57  * GLOB_NOMAGIC:
  58  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  59  *      not contain any magic characters.  [Used in csh style globbing]
  60  * GLOB_ALTDIRFUNC:
  61  *      Use alternately specified directory access functions.
  62  * GLOB_TILDE:
  63  *      expand ~user/foo to the /home/dir/of/user/foo
  64  * GLOB_BRACE:
  65  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  66  * gl_matchc:
  67  *      Number of matches in the current invocation of glob.
  68  */
  69
  70 #ifndef lint
  71 static const char rcsid[] =
  72         "$Id: compatglob.c,v 1.7 2002/01/16 09:32:14 stelian Exp $";
  73 #endif /* not lint */
  74
  75 #include <config.h>
  76
  77 #ifndef HAVE_GLOB
  78
  79 #include <sys/param.h>
  80 #include <sys/stat.h>
  81
  82 #include <ctype.h>
  83 #include <dirent.h>
  84 #include <errno.h>
  85 #include <compatglob.h>
  86 #include <pwd.h>
  87 #include <stdio.h>
  88 #include <stdlib.h>
  89 #include <string.h>
  90 #include <unistd.h>
  91
  92 #define DOLLAR          '$'
  93 #define DOT             '.'
  94 #define EOS             '\0'
  95 #define LBRACKET        '['
  96 #define NOT             '!'
  97 #define QUESTION        '?'
  98 #define QUOTE           '\\'
  99 #define RANGE           '-'
 100 #define RBRACKET        ']'
 101 #define SEP             '/'
 102 #define STAR            '*'
 103 #define TILDE           '~'
 104 #define UNDERSCORE      '_'
 105 #define LBRACE          '{'
 106 #define RBRACE          '}'
 107 #define SLASH           '/'
 108 #define COMMA           ','
 109
 110 #ifndef DEBUG
 111
 112 #define M_QUOTE         0x8000
 113 #define M_PROTECT       0x4000
 114 #define M_MASK          0xffff
 115 #define M_ASCII         0x00ff
 116
 117 typedef u_short Char;
 118
 119 #else
 120
 121 #define M_QUOTE         0x80
 122 #define M_PROTECT       0x40
 123 #define M_MASK          0xff
 124 #define M_ASCII         0x7f
 125
 126 typedef char Char;
 127
 128 #endif
 129
 130
 131 #define CHAR(c)         ((Char)((c)&M_ASCII))
 132 #define META(c)         ((Char)((c)|M_QUOTE))
 133 #define M_ALL           META('*')
 134 #define M_END           META(']')
 135 #define M_NOT           META('!')
 136 #define M_ONE           META('?')
 137 #define M_RNG           META('-')
 138 #define M_SET           META('[')
 139 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 140
 141
 142 static int       compare __P((const void *, const void *));
 143 static void      g_Ctoc __P((const Char *, char *));
 144 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 145 static DIR      *g_opendir __P((Char *, glob_t *));
 146 static Char     *g_strchr __P((Char *, int));
 147 #ifdef notdef
 148 static Char     *g_strcat __P((Char *, const Char *));
 149 #endif
 150 static int       g_stat __P((Char *, struct stat *, glob_t *));
 151 static int       glob0 __P((const Char *, glob_t *));
 152 static int       glob1 __P((Char *, glob_t *));
 153 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 154 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 155 static int       globextend __P((const Char *, glob_t *));
 156 static const Char *      globtilde __P((const Char *, Char *, size_t, glob_t *));
 157 static int       globexp1 __P((const Char *, glob_t *));
 158 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 159 static int       match __P((Char *, Char *, Char *));
 160 #ifdef DEBUG
 161 static void      qprintf __P((const char *, Char *));
 162 #endif
 163
 164 int
 165 glob(const char *pattern, int flags, int (*errfunc) __P((const char *, int)), glob_t *pglob)
 166 {
 167         const u_char *patnext;
 168         int c;
 169         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 170
 171         patnext = (u_char *) pattern;
 172         if (!(flags & GLOB_APPEND)) {
 173                 pglob->gl_pathc = 0;
 174                 pglob->gl_pathv = NULL;
 175                 if (!(flags & GLOB_DOOFFS))
 176                         pglob->gl_offs = 0;
 177         }
 178         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 179         pglob->gl_errfunc = errfunc;
 180         pglob->gl_matchc = 0;
 181
 182         bufnext = patbuf;
 183         bufend = bufnext + MAXPATHLEN;
 184         if (flags & GLOB_QUOTE) {
 185                 /* Protect the quoted characters. */
 186                 while (bufnext < bufend && (c = *patnext++) != EOS)
 187                         if (c == QUOTE) {
 188                                 if ((c = *patnext++) == EOS) {
 189                                         c = QUOTE;
 190                                         --patnext;
 191                                 }
 192                                 *bufnext++ = c | M_PROTECT;
 193                         }
 194                         else
 195                                 *bufnext++ = c;
 196         }
 197         else
 198             while (bufnext < bufend && (c = *patnext++) != EOS)
 199                     *bufnext++ = c;
 200         *bufnext = EOS;
 201
 202         if (flags & GLOB_BRACE)
 203             return globexp1(patbuf, pglob);
 204         else
 205             return glob0(patbuf, pglob);
 206 }
 207
 208 /*
 209  * Expand recursively a glob {} pattern. When there is no more expansion
 210  * invoke the standard globbing routine to glob the rest of the magic
 211  * characters
 212  */
 213 static int globexp1(const Char *pattern, glob_t *pglob)
 214 {
 215         const Char* ptr = pattern;
 216         int rv;
 217
 218         /* Protect a single {}, for find(1), like csh */
 219         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 220                 return glob0(pattern, pglob);
 221
 222         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 223                 if (!globexp2(ptr, pattern, pglob, &rv))
 224                         return rv;
 225
 226         return glob0(pattern, pglob);
 227 }
 228
 229
 230 /*
 231  * Recursive brace globbing helper. Tries to expand a single brace.
 232  * If it succeeds then it invokes globexp1 with the new pattern.
 233  * If it fails then it tries to glob the rest of the pattern and returns.
 234  */
 235 static int globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 236 {
 237         int     i;
 238         Char   *lm, *ls;
 239         const Char *pe, *pm, *pl;
 240         Char    patbuf[MAXPATHLEN + 1];
 241
 242         /* copy part up to the brace */
 243         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 244                 continue;
 245         ls = lm;
 246
 247         /* Find the balanced brace */
 248         for (i = 0, pe = ++ptr; *pe; pe++)
 249                 if (*pe == LBRACKET) {
 250                         /* Ignore everything between [] */
 251                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 252                                 continue;
 253                         if (*pe == EOS) {
 254                                 /*
 255                                  * We could not find a matching RBRACKET.
 256                                  * Ignore and just look for RBRACE
 257                                  */
 258                                 pe = pm;
 259                         }
 260                 }
 261                 else if (*pe == LBRACE)
 262                         i++;
 263                 else if (*pe == RBRACE) {
 264                         if (i == 0)
 265                                 break;
 266                         i--;
 267                 }
 268
 269         /* Non matching braces; just glob the pattern */
 270         if (i != 0 || *pe == EOS) {
 271                 *rv = glob0(patbuf, pglob);
 272                 return 0;
 273         }
 274
 275         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 276                 switch (*pm) {
 277                 case LBRACKET:
 278                         /* Ignore everything between [] */
 279                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 280                                 continue;
 281                         if (*pm == EOS) {
 282                                 /*
 283                                  * We could not find a matching RBRACKET.
 284                                  * Ignore and just look for RBRACE
 285                                  */
 286                                 pm = pl;
 287                         }
 288                         break;
 289
 290                 case LBRACE:
 291                         i++;
 292                         break;
 293
 294                 case RBRACE:
 295                         if (i) {
 296                             i--;
 297                             break;
 298                         }
 299                         /* FALLTHROUGH */
 300                 case COMMA:
 301                         if (i && *pm == COMMA)
 302                                 break;
 303                         else {
 304                                 /* Append the current string */
 305                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 306                                         continue;
 307                                 /*
 308                                  * Append the rest of the pattern after the
 309                                  * closing brace
 310                                  */
 311                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 312                                         continue;
 313
 314                                 /* Expand the current pattern */
 315 #ifdef DEBUG
 316                                 qprintf("globexp2:", patbuf);
 317 #endif
 318                                 *rv = globexp1(patbuf, pglob);
 319
 320                                 /* move after the comma, to the next string */
 321                                 pl = pm + 1;
 322                         }
 323                         break;
 324
 325                 default:
 326                         break;
 327                 }
 328         *rv = 0;
 329         return 0;
 330 }
 331
 332
 333
 334 /*
 335  * expand tilde from the passwd file.
 336  */
 337 static const Char *
 338 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 339 {
 340         struct passwd *pwd;
 341         char *h;
 342         const Char *p;
 343         Char *b, *eb;
 344
 345         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 346                 return pattern;
 347
 348         /*
 349          * Copy up to the end of the string or /
 350          */
 351         eb = &patbuf[patbuf_len - 1];
 352         for (p = pattern + 1, h = (char *) patbuf;
 353             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 354                 continue;
 355
 356         *h = EOS;
 357
 358         if (((char *) patbuf)[0] == EOS) {
 359                 /*
 360                  * handle a plain ~ or ~/ by expanding $HOME first if
 361                  * we're not running setuid or setgid) and then trying
 362                  * the password file
 363                  */
 364                 if (
 365 #ifndef __linux__
 366 #ifndef __NETBSD_SYSCALLS
 367                     issetugid() != 0 ||
 368 #endif
 369 #endif
 370                     (h = getenv("HOME")) == NULL) {
 371                         if (((h = getlogin()) != NULL &&
 372                              (pwd = getpwnam(h)) != NULL) ||
 373                             (pwd = getpwuid(getuid())) != NULL)
 374                                 h = pwd->pw_dir;
 375                         else
 376                                 return pattern;
 377                 }
 378         }
 379         else {
 380                 /*
 381                  * Expand a ~user
 382                  */
 383                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 384                         return pattern;
 385                 else
 386                         h = pwd->pw_dir;
 387         }
 388
 389         /* Copy the home directory */
 390         for (b = patbuf; b < eb && *h; *b++ = *h++)
 391                 continue;
 392
 393         /* Append the rest of the pattern */
 394         while (b < eb && (*b++ = *p++) != EOS)
 395                 continue;
 396         *b = EOS;
 397
 398         return patbuf;
 399 }
 400
 401
 402 /*
 403  * The main glob() routine: compiles the pattern (optionally processing
 404  * quotes), calls glob1() to do the real pattern matching, and finally
 405  * sorts the list (unless unsorted operation is requested).  Returns 0
 406  * if things went well, nonzero if errors occurred.  It is not an error
 407  * to find no matches.
 408  */
 409 static int
 410 glob0(const Char *pattern, glob_t *pglob)
 411 {
 412         const Char *qpatnext;
 413         int c, err, oldpathc;
 414         Char *bufnext, patbuf[MAXPATHLEN+1];
 415
 416         qpatnext = globtilde(pattern, patbuf, sizeof(patbuf) / sizeof(Char),
 417             pglob);
 418         oldpathc = pglob->gl_pathc;
 419         bufnext = patbuf;
 420
 421         /* We don't need to check for buffer overflow any more. */
 422         while ((c = *qpatnext++) != EOS) {
 423                 switch (c) {
 424                 case LBRACKET:
 425                         c = *qpatnext;
 426                         if (c == NOT)
 427                                 ++qpatnext;
 428                         if (*qpatnext == EOS ||
 429                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 430                                 *bufnext++ = LBRACKET;
 431                                 if (c == NOT)
 432                                         --qpatnext;
 433                                 break;
 434                         }
 435                         *bufnext++ = M_SET;
 436                         if (c == NOT)
 437                                 *bufnext++ = M_NOT;
 438                         c = *qpatnext++;
 439                         do {
 440                                 *bufnext++ = CHAR(c);
 441                                 if (*qpatnext == RANGE &&
 442                                     (c = qpatnext[1]) != RBRACKET) {
 443                                         *bufnext++ = M_RNG;
 444                                         *bufnext++ = CHAR(c);
 445                                         qpatnext += 2;
 446                                 }
 447                         } while ((c = *qpatnext++) != RBRACKET);
 448                         pglob->gl_flags |= GLOB_MAGCHAR;
 449                         *bufnext++ = M_END;
 450                         break;
 451                 case QUESTION:
 452                         pglob->gl_flags |= GLOB_MAGCHAR;
 453                         *bufnext++ = M_ONE;
 454                         break;
 455                 case STAR:
 456                         pglob->gl_flags |= GLOB_MAGCHAR;
 457                         /* collapse adjacent stars to one,
 458                          * to avoid exponential behavior
 459                          */
 460                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 461                             *bufnext++ = M_ALL;
 462                         break;
 463                 default:
 464                         *bufnext++ = CHAR(c);
 465                         break;
 466                 }
 467         }
 468         *bufnext = EOS;
 469 #ifdef DEBUG
 470         qprintf("glob0:", patbuf);
 471 #endif
 472
 473         if ((err = glob1(patbuf, pglob)) != 0)
 474                 return(err);
 475
 476         /*
 477          * If there was no match we are going to append the pattern
 478          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 479          * and the pattern did not contain any magic characters
 480          * GLOB_NOMAGIC is there just for compatibility with csh.
 481          */
 482         if (pglob->gl_pathc == oldpathc &&
 483             ((pglob->gl_flags & GLOB_NOCHECK) ||
 484               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 485                !(pglob->gl_flags & GLOB_MAGCHAR))))
 486                 return(globextend(pattern, pglob));
 487         else if (!(pglob->gl_flags & GLOB_NOSORT))
 488                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 489                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 490         return(0);
 491 }
 492
 493 static int
 494 compare(const void *p, const void *q)
 495 {
 496         return(strcmp(*(char **)p, *(char **)q));
 497 }
 498
 499 static int
 500 glob1(Char *pattern, glob_t *pglob)
 501 {
 502         Char pathbuf[MAXPATHLEN+1];
 503
 504         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 505         if (*pattern == EOS)
 506                 return(0);
 507         return(glob2(pathbuf, pathbuf, pattern, pglob));
 508 }
 509
 510 /*
 511  * The functions glob2 and glob3 are mutually recursive; there is one level
 512  * of recursion for each segment in the pattern that contains one or more
 513  * meta characters.
 514  */
 515 static int
 516 glob2(Char *pathbuf, Char *pathend, Char *pattern, glob_t *pglob)
 517 {
 518         struct stat sb;
 519         Char *p, *q;
 520         int anymeta;
 521
 522         /*
 523          * Loop over pattern segments until end of pattern or until
 524          * segment with meta character found.
 525          */
 526         for (anymeta = 0;;) {
 527                 if (*pattern == EOS) {          /* End of pattern? */
 528                         *pathend = EOS;
 529                         if (g_lstat(pathbuf, &sb, pglob))
 530                                 return(0);
 531
 532                         if (((pglob->gl_flags & GLOB_MARK) &&
 533                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 534                             || (S_ISLNK(sb.st_mode) &&
 535                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 536                             S_ISDIR(sb.st_mode)))) {
 537                                 *pathend++ = SEP;
 538                                 *pathend = EOS;
 539                         }
 540                         ++pglob->gl_matchc;
 541                         return(globextend(pathbuf, pglob));
 542                 }
 543
 544                 /* Find end of next segment, copy tentatively to pathend. */
 545                 q = pathend;
 546                 p = pattern;
 547                 while (*p != EOS && *p != SEP) {
 548                         if (ismeta(*p))
 549                                 anymeta = 1;
 550                         *q++ = *p++;
 551                 }
 552
 553                 if (!anymeta) {         /* No expansion, do next segment. */
 554                         pathend = q;
 555                         pattern = p;
 556                         while (*pattern == SEP)
 557                                 *pathend++ = *pattern++;
 558                 } else                  /* Need expansion, recurse. */
 559                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 560         }
 561         /* NOTREACHED */
 562 }
 563
 564 static int
 565 glob3(Char *pathbuf, Char *pathend, Char *pattern, Char *restpattern, glob_t *pglob)
 566 {
 567         register struct dirent *dp;
 568         DIR *dirp;
 569         int err;
 570         char buf[MAXPATHLEN];
 571
 572         /*
 573          * The readdirfunc declaration can't be prototyped, because it is
 574          * assigned, below, to two functions which are prototyped in glob.h
 575          * and dirent.h as taking pointers to differently typed opaque
 576          * structures.
 577          */
 578         struct dirent *(*readdirfunc)();
 579
 580         *pathend = EOS;
 581         errno = 0;
 582
 583         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 584                 /* TODO: don't call for ENOENT or ENOTDIR? */
 585                 if (pglob->gl_errfunc) {
 586                         g_Ctoc(pathbuf, buf);
 587                         if (pglob->gl_errfunc(buf, errno) ||
 588                             pglob->gl_flags & GLOB_ERR)
 589                                 return (GLOB_ABEND);
 590                 }
 591                 return(0);
 592         }
 593
 594         err = 0;
 595
 596         /* Search directory for matching names. */
 597         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 598                 readdirfunc = pglob->gl_readdir;
 599         else
 600                 readdirfunc = readdir;
 601         while ((dp = (*readdirfunc)(dirp))) {
 602                 register u_char *sc;
 603                 register Char *dc;
 604
 605                 /* Initial DOT must be matched literally. */
 606                 if (dp->d_name[0] == DOT && *pattern != DOT)
 607                         continue;
 608                 for (sc = (u_char *) dp->d_name, dc = pathend;
 609                      (*dc++ = *sc++) != EOS;)
 610                         continue;
 611                 if (!match(pathend, pattern, restpattern)) {
 612                         *pathend = EOS;
 613                         continue;
 614                 }
 615                 err = glob2(pathbuf, --dc, restpattern, pglob);
 616                 if (err)
 617                         break;
 618         }
 619
 620         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 621                 (*pglob->gl_closedir)(dirp);
 622         else
 623                 closedir(dirp);
 624         return(err);
 625 }
 626
 627
 628 /*
 629  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 630  * add the new item, and update gl_pathc.
 631  *
 632  * This assumes the BSD realloc, which only copies the block when its size
 633  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 634  * behavior.
 635  *
 636  * Return 0 if new item added, error code if memory couldn't be allocated.
 637  *
 638  * Invariant of the glob_t structure:
 639  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 640  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 641  */
 642 static int
 643 globextend(const Char *path, glob_t *pglob)
 644 {
 645         register char **pathv;
 646         register int i;
 647         u_int newsize;
 648         char *copy;
 649         const Char *p;
 650
 651         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 652         pathv = pglob->gl_pathv ?
 653                     realloc((char *)pglob->gl_pathv, newsize) :
 654                     malloc(newsize);
 655         if (pathv == NULL)
 656                 return(GLOB_NOSPACE);
 657
 658         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 659                 /* first time around -- clear initial gl_offs items */
 660                 pathv += pglob->gl_offs;
 661                 for (i = pglob->gl_offs; --i >= 0; )
 662                         *--pathv = NULL;
 663         }
 664         pglob->gl_pathv = pathv;
 665
 666         for (p = path; *p++;)
 667                 continue;
 668         if ((copy = malloc(p - path)) != NULL) {
 669                 g_Ctoc(path, copy);
 670                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 671         }
 672         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 673         return(copy == NULL ? GLOB_NOSPACE : 0);
 674 }
 675
 676 /*
 677  * pattern matching function for filenames.  Each occurrence of the *
 678  * pattern causes a recursion level.
 679  */
 680 static int
 681 match(Char *name, Char *pat, Char *patend)
 682 {
 683         int ok, negate_range;
 684         Char c, k;
 685
 686         while (pat < patend) {
 687                 c = *pat++;
 688                 switch (c & M_MASK) {
 689                 case M_ALL:
 690                         if (pat == patend)
 691                                 return(1);
 692                         do
 693                             if (match(name, pat, patend))
 694                                     return(1);
 695                         while (*name++ != EOS);
 696                         return(0);
 697                 case M_ONE:
 698                         if (*name++ == EOS)
 699                                 return(0);
 700                         break;
 701                 case M_SET:
 702                         ok = 0;
 703                         if ((k = *name++) == EOS)
 704                                 return(0);
 705                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 706                                 ++pat;
 707                         while (((c = *pat++) & M_MASK) != M_END)
 708                                 if ((*pat & M_MASK) == M_RNG) {
 709                                         if (c <= k && k <= pat[1])
 710                                                 ok = 1;
 711                                         pat += 2;
 712                                 } else if (c == k)
 713                                         ok = 1;
 714                         if (ok == negate_range)
 715                                 return(0);
 716                         break;
 717                 default:
 718                         if (*name++ != c)
 719                                 return(0);
 720                         break;
 721                 }
 722         }
 723         return(*name == EOS);
 724 }
 725
 726 /* Free allocated data belonging to a glob_t structure. */
 727 void
 728 globfree(glob_t *pglob)
 729 {
 730         register int i;
 731         register char **pp;
 732
 733         if (pglob->gl_pathv != NULL) {
 734                 pp = pglob->gl_pathv + pglob->gl_offs;
 735                 for (i = pglob->gl_pathc; i--; ++pp)
 736                         if (*pp)
 737                                 free(*pp);
 738                 free(pglob->gl_pathv);
 739         }
 740 }
 741
 742 static DIR *
 743 g_opendir(Char *str, glob_t *pglob)
 744 {
 745         char buf[MAXPATHLEN];
 746
 747         if (!*str)
 748                 strcpy(buf, ".");
 749         else
 750                 g_Ctoc(str, buf);
 751
 752         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 753                 return((*pglob->gl_opendir)(buf));
 754
 755         return(opendir(buf));
 756 }
 757
 758 static int
 759 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 760 {
 761         char buf[MAXPATHLEN];
 762
 763         g_Ctoc(fn, buf);
 764         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 765                 return((*pglob->gl_lstat)(buf, sb));
 766         return(lstat(buf, sb));
 767 }
 768
 769 static int
 770 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 771 {
 772         char buf[MAXPATHLEN];
 773
 774         g_Ctoc(fn, buf);
 775         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 776                 return((*pglob->gl_stat)(buf, sb));
 777         return(stat(buf, sb));
 778 }
 779
 780 static Char *
 781 g_strchr(Char *str, int ch)
 782 {
 783         do {
 784                 if (*str == ch)
 785                         return (str);
 786         } while (*str++);
 787         return (NULL);
 788 }
 789
 790 #ifdef notdef
 791 static Char *
 792 g_strcat(Char *dst, const Char *src)
 793 {
 794         Char *sdst = dst;
 795
 796         while (*dst++)
 797                 continue;
 798         --dst;
 799         while((*dst++ = *src++) != EOS)
 800             continue;
 801
 802         return (sdst);
 803 }
 804 #endif
 805
 806 static void
 807 g_Ctoc(const Char *str, char *buf)
 808 {
 809         register char *dc;
 810
 811         for (dc = buf; (*dc++ = *str++) != EOS;)
 812                 continue;
 813 }
 814
 815 #ifdef DEBUG
 816 static void
 817 qprintf(const char *str, Char *s)
 818 {
 819         register Char *p;
 820
 821         (void)printf("%s:\n", str);
 822         for (p = s; *p; p++)
 823                 (void)printf("%c", CHAR(*p));
 824         (void)printf("\n");
 825         for (p = s; *p; p++)
 826                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 827         (void)printf("\n");
 828         for (p = s; *p; p++)
 829                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 830         (void)printf("\n");
 831 }
 832 #endif
 833
 834 #endif /* ! HAVE_GLOB */