gen/glob.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Copyright (c) 1999-2003 Apple Computer, Inc.  All Rights Reserved.
   7  *
   8  * This file contains Original Code and/or Modifications of Original Code
   9  * as defined in and that are subject to the Apple Public Source License
  10  * Version 2.0 (the 'License'). You may not use this file except in
  11  * compliance with the License. Please obtain a copy of the License at
  12  * http://www.opensource.apple.com/apsl/ and read it before using this
  13  * file.
  14  *
  15  * The Original Code and all software distributed under the License are
  16  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  17  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  18  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  19  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  20  * Please see the License for the specific language governing rights and
  21  * limitations under the License.
  22  *
  23  * @APPLE_LICENSE_HEADER_END@
  24  */
  25 /*
  26  * Copyright (c) 1989, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  *
  29  * This code is derived from software contributed to Berkeley by
  30  * Guido van Rossum.
  31  *
  32  * Redistribution and use in source and binary forms, with or without
  33  * modification, are permitted provided that the following conditions
  34  * are met:
  35  * 1. Redistributions of source code must retain the above copyright
  36  *    notice, this list of conditions and the following disclaimer.
  37  * 2. Redistributions in binary form must reproduce the above copyright
  38  *    notice, this list of conditions and the following disclaimer in the
  39  *    documentation and/or other materials provided with the distribution.
  40  * 3. All advertising materials mentioning features or use of this software
  41  *    must display the following acknowledgement:
  42  *      This product includes software developed by the University of
  43  *      California, Berkeley and its contributors.
  44  * 4. Neither the name of the University nor the names of its contributors
  45  *    may be used to endorse or promote products derived from this software
  46  *    without specific prior written permission.
  47  *
  48  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  49  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  50  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  51  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  52  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  53  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  54  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  55  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  56  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  57  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  58  * SUCH DAMAGE.
  59  */
  60
  61
  62 /*
  63  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  64  *
  65  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  66  *
  67  * Optional extra services, controlled by flags not defined by POSIX:
  68  *
  69  * GLOB_QUOTE:
  70  *      Escaping convention: \ inhibits any special meaning the following
  71  *      character might have (except \ at end of string is retained).
  72  * GLOB_MAGCHAR:
  73  *      Set in gl_flags if pattern contained a globbing character.
  74  * GLOB_NOMAGIC:
  75  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  76  *      not contain any magic characters.  [Used in csh style globbing]
  77  * GLOB_ALTDIRFUNC:
  78  *      Use alternately specified directory access functions.
  79  * GLOB_TILDE:
  80  *      expand ~user/foo to the /home/dir/of/user/foo
  81  * GLOB_BRACE:
  82  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  83  * gl_matchc:
  84  *      Number of matches in the current invocation of glob.
  85  */
  86
  87 #include <sys/param.h>
  88 #include <sys/stat.h>
  89
  90 #include <ctype.h>
  91 #include <dirent.h>
  92 #include <errno.h>
  93 #include <glob.h>
  94 #include <pwd.h>
  95 #include <stdio.h>
  96 #include <stdlib.h>
  97 #include <string.h>
  98 #include <unistd.h>
  99
 100 #define DOLLAR          '$'
 101 #define DOT             '.'
 102 #define EOS             '\0'
 103 #define LBRACKET        '['
 104 #define NOT             '!'
 105 #define QUESTION        '?'
 106 #define QUOTE           '\\'
 107 #define RANGE           '-'
 108 #define RBRACKET        ']'
 109 #define SEP             '/'
 110 #define STAR            '*'
 111 #define TILDE           '~'
 112 #define UNDERSCORE      '_'
 113 #define LBRACE          '{'
 114 #define RBRACE          '}'
 115 #define SLASH           '/'
 116 #define COMMA           ','
 117
 118 #ifndef DEBUG
 119
 120 #define M_QUOTE         0x8000
 121 #define M_PROTECT       0x4000
 122 #define M_MASK          0xffff
 123 #define M_ASCII         0x00ff
 124
 125 typedef u_short Char;
 126
 127 #else
 128
 129 #define M_QUOTE         0x80
 130 #define M_PROTECT       0x40
 131 #define M_MASK          0xff
 132 #define M_ASCII         0x7f
 133
 134 typedef char Char;
 135
 136 #endif
 137
 138
 139 #define CHAR(c)         ((Char)((c)&M_ASCII))
 140 #define META(c)         ((Char)((c)|M_QUOTE))
 141 #define M_ALL           META('*')
 142 #define M_END           META(']')
 143 #define M_NOT           META('!')
 144 #define M_ONE           META('?')
 145 #define M_RNG           META('-')
 146 #define M_SET           META('[')
 147 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 148
 149
 150 static int       compare __P((const void *, const void *));
 151 static void      g_Ctoc __P((const Char *, char *));
 152 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 153 static DIR      *g_opendir __P((Char *, glob_t *));
 154 static Char     *g_strchr __P((Char *, int));
 155 #ifdef notdef
 156 static Char     *g_strcat __P((Char *, const Char *));
 157 #endif
 158 static int       g_stat __P((Char *, struct stat *, glob_t *));
 159 static int       glob0 __P((const Char *, glob_t *));
 160 static int       glob1 __P((Char *, glob_t *));
 161 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 162 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 163 static int       globextend __P((const Char *, glob_t *));
 164 static const Char *      globtilde __P((const Char *, Char *, glob_t *));
 165 static int       globexp1 __P((const Char *, glob_t *));
 166 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 167 static int       match __P((Char *, Char *, Char *));
 168 #ifdef DEBUG
 169 static void      qprintf __P((const char *, Char *));
 170 #endif
 171
 172 int
 173 glob(pattern, flags, errfunc, pglob)
 174         const char *pattern;
 175         int flags, (*errfunc) __P((const char *, int));
 176         glob_t *pglob;
 177 {
 178         const u_char *patnext;
 179         int c;
 180         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 181
 182         patnext = (u_char *) pattern;
 183         if (!(flags & GLOB_APPEND)) {
 184                 pglob->gl_pathc = 0;
 185                 pglob->gl_pathv = NULL;
 186                 if (!(flags & GLOB_DOOFFS))
 187                         pglob->gl_offs = 0;
 188         }
 189         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 190         pglob->gl_errfunc = errfunc;
 191         pglob->gl_matchc = 0;
 192
 193         bufnext = patbuf;
 194         bufend = bufnext + MAXPATHLEN;
 195         if (flags & GLOB_QUOTE) {
 196                 /* Protect the quoted characters. */
 197                 while (bufnext < bufend && (c = *patnext++) != EOS)
 198                         if (c == QUOTE) {
 199                                 if ((c = *patnext++) == EOS) {
 200                                         c = QUOTE;
 201                                         --patnext;
 202                                 }
 203                                 *bufnext++ = c | M_PROTECT;
 204                         }
 205                         else
 206                                 *bufnext++ = c;
 207         }
 208         else
 209             while (bufnext < bufend && (c = *patnext++) != EOS)
 210                     *bufnext++ = c;
 211         *bufnext = EOS;
 212
 213         if (flags & GLOB_BRACE)
 214             return globexp1(patbuf, pglob);
 215         else
 216             return glob0(patbuf, pglob);
 217 }
 218
 219 /*
 220  * Expand recursively a glob {} pattern. When there is no more expansion
 221  * invoke the standard globbing routine to glob the rest of the magic
 222  * characters
 223  */
 224 static int globexp1(pattern, pglob)
 225         const Char *pattern;
 226         glob_t *pglob;
 227 {
 228         const Char* ptr = pattern;
 229         int rv;
 230
 231         /* Protect a single {}, for find(1), like csh */
 232         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 233                 return glob0(pattern, pglob);
 234
 235         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 236                 if (!globexp2(ptr, pattern, pglob, &rv))
 237                         return rv;
 238
 239         return glob0(pattern, pglob);
 240 }
 241
 242
 243 /*
 244  * Recursive brace globbing helper. Tries to expand a single brace.
 245  * If it succeeds then it invokes globexp1 with the new pattern.
 246  * If it fails then it tries to glob the rest of the pattern and returns.
 247  */
 248 static int globexp2(ptr, pattern, pglob, rv)
 249         const Char *ptr, *pattern;
 250         glob_t *pglob;
 251         int *rv;
 252 {
 253         int     i;
 254         Char   *lm, *ls;
 255         const Char *pe, *pm, *pl;
 256         Char    patbuf[MAXPATHLEN + 1];
 257
 258         /* copy part up to the brace */
 259         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 260                 continue;
 261         ls = lm;
 262
 263         /* Find the balanced brace */
 264         for (i = 0, pe = ++ptr; *pe; pe++)
 265                 if (*pe == LBRACKET) {
 266                         /* Ignore everything between [] */
 267                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 268                                 continue;
 269                         if (*pe == EOS) {
 270                                 /*
 271                                  * We could not find a matching RBRACKET.
 272                                  * Ignore and just look for RBRACE
 273                                  */
 274                                 pe = pm;
 275                         }
 276                 }
 277                 else if (*pe == LBRACE)
 278                         i++;
 279                 else if (*pe == RBRACE) {
 280                         if (i == 0)
 281                                 break;
 282                         i--;
 283                 }
 284
 285         /* Non matching braces; just glob the pattern */
 286         if (i != 0 || *pe == EOS) {
 287                 *rv = glob0(patbuf, pglob);
 288                 return 0;
 289         }
 290
 291         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 292                 switch (*pm) {
 293                 case LBRACKET:
 294                         /* Ignore everything between [] */
 295                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 296                                 continue;
 297                         if (*pm == EOS) {
 298                                 /*
 299                                  * We could not find a matching RBRACKET.
 300                                  * Ignore and just look for RBRACE
 301                                  */
 302                                 pm = pl;
 303                         }
 304                         break;
 305
 306                 case LBRACE:
 307                         i++;
 308                         break;
 309
 310                 case RBRACE:
 311                         if (i) {
 312                             i--;
 313                             break;
 314                         }
 315                         /* FALLTHROUGH */
 316                 case COMMA:
 317                         if (i && *pm == COMMA)
 318                                 break;
 319                         else {
 320                                 /* Append the current string */
 321                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 322                                         continue;
 323                                 /*
 324                                  * Append the rest of the pattern after the
 325                                  * closing brace
 326                                  */
 327                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 328                                         continue;
 329
 330                                 /* Expand the current pattern */
 331 #ifdef DEBUG
 332                                 qprintf("globexp2:", patbuf);
 333 #endif
 334                                 *rv = globexp1(patbuf, pglob);
 335
 336                                 /* move after the comma, to the next string */
 337                                 pl = pm + 1;
 338                         }
 339                         break;
 340
 341                 default:
 342                         break;
 343                 }
 344         *rv = 0;
 345         return 0;
 346 }
 347
 348
 349
 350 /*
 351  * expand tilde from the passwd file.
 352  */
 353 static const Char *
 354 globtilde(pattern, patbuf, pglob)
 355         const Char *pattern;
 356         Char *patbuf;
 357         glob_t *pglob;
 358 {
 359         struct passwd *pwd;
 360         char *h;
 361         const Char *p;
 362         Char *b;
 363
 364         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 365                 return pattern;
 366
 367         /* Copy up to the end of the string or / */
 368         for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
 369              *h++ = *p++)
 370                 continue;
 371
 372         *h = EOS;
 373
 374         if (((char *) patbuf)[0] == EOS) {
 375                 /*
 376                  * handle a plain ~ or ~/ by expanding $HOME
 377                  * first and then trying the password file
 378                  */
 379                 if ((h = getenv("HOME")) == NULL) {
 380                         if ((pwd = getpwuid(getuid())) == NULL)
 381                                 return pattern;
 382                         else
 383                                 h = pwd->pw_dir;
 384                 }
 385         }
 386         else {
 387                 /*
 388                  * Expand a ~user
 389                  */
 390                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 391                         return pattern;
 392                 else
 393                         h = pwd->pw_dir;
 394         }
 395
 396         /* Copy the home directory */
 397         for (b = patbuf; *h; *b++ = *h++)
 398                 continue;
 399
 400         /* Append the rest of the pattern */
 401         while ((*b++ = *p++) != EOS)
 402                 continue;
 403
 404         return patbuf;
 405 }
 406
 407
 408 /*
 409  * The main glob() routine: compiles the pattern (optionally processing
 410  * quotes), calls glob1() to do the real pattern matching, and finally
 411  * sorts the list (unless unsorted operation is requested).  Returns 0
 412  * if things went well, nonzero if errors occurred.  It is not an error
 413  * to find no matches.
 414  */
 415 static int
 416 glob0(pattern, pglob)
 417         const Char *pattern;
 418         glob_t *pglob;
 419 {
 420         const Char *qpatnext;
 421         int c, err, oldpathc;
 422         Char *bufnext, patbuf[MAXPATHLEN+1];
 423
 424         qpatnext = globtilde(pattern, patbuf, pglob);
 425         oldpathc = pglob->gl_pathc;
 426         bufnext = patbuf;
 427
 428         /* We don't need to check for buffer overflow any more. */
 429         while ((c = *qpatnext++) != EOS) {
 430                 switch (c) {
 431                 case LBRACKET:
 432                         c = *qpatnext;
 433                         if (c == NOT)
 434                                 ++qpatnext;
 435                         if (*qpatnext == EOS ||
 436                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 437                                 *bufnext++ = LBRACKET;
 438                                 if (c == NOT)
 439                                         --qpatnext;
 440                                 break;
 441                         }
 442                         *bufnext++ = M_SET;
 443                         if (c == NOT)
 444                                 *bufnext++ = M_NOT;
 445                         c = *qpatnext++;
 446                         do {
 447                                 *bufnext++ = CHAR(c);
 448                                 if (*qpatnext == RANGE &&
 449                                     (c = qpatnext[1]) != RBRACKET) {
 450                                         *bufnext++ = M_RNG;
 451                                         *bufnext++ = CHAR(c);
 452                                         qpatnext += 2;
 453                                 }
 454                         } while ((c = *qpatnext++) != RBRACKET);
 455                         pglob->gl_flags |= GLOB_MAGCHAR;
 456                         *bufnext++ = M_END;
 457                         break;
 458                 case QUESTION:
 459                         pglob->gl_flags |= GLOB_MAGCHAR;
 460                         *bufnext++ = M_ONE;
 461                         break;
 462                 case STAR:
 463                         pglob->gl_flags |= GLOB_MAGCHAR;
 464                         /* collapse adjacent stars to one,
 465                          * to avoid exponential behavior
 466                          */
 467                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 468                             *bufnext++ = M_ALL;
 469                         break;
 470                 default:
 471                         *bufnext++ = CHAR(c);
 472                         break;
 473                 }
 474         }
 475         *bufnext = EOS;
 476 #ifdef DEBUG
 477         qprintf("glob0:", patbuf);
 478 #endif
 479
 480         if ((err = glob1(patbuf, pglob)) != 0)
 481                 return(err);
 482
 483         /*
 484          * If there was no match we are going to append the pattern
 485          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 486          * and the pattern did not contain any magic characters
 487          * GLOB_NOMAGIC is there just for compatibility with csh.
 488          */
 489         if (pglob->gl_pathc == oldpathc &&
 490             ((pglob->gl_flags & GLOB_NOCHECK) ||
 491               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 492                !(pglob->gl_flags & GLOB_MAGCHAR))))
 493                 return(globextend(pattern, pglob));
 494         else if (!(pglob->gl_flags & GLOB_NOSORT))
 495                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 496                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 497         return(0);
 498 }
 499
 500 static int
 501 compare(p, q)
 502         const void *p, *q;
 503 {
 504         return(strcmp(*(char **)p, *(char **)q));
 505 }
 506
 507 static int
 508 glob1(pattern, pglob)
 509         Char *pattern;
 510         glob_t *pglob;
 511 {
 512         Char pathbuf[MAXPATHLEN+1];
 513
 514         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 515         if (*pattern == EOS)
 516                 return(0);
 517         return(glob2(pathbuf, pathbuf, pattern, pglob));
 518 }
 519
 520 /*
 521  * The functions glob2 and glob3 are mutually recursive; there is one level
 522  * of recursion for each segment in the pattern that contains one or more
 523  * meta characters.
 524  */
 525 static int
 526 glob2(pathbuf, pathend, pattern, pglob)
 527         Char *pathbuf, *pathend, *pattern;
 528         glob_t *pglob;
 529 {
 530         struct stat sb;
 531         Char *p, *q;
 532         int anymeta;
 533
 534         /*
 535          * Loop over pattern segments until end of pattern or until
 536          * segment with meta character found.
 537          */
 538         for (anymeta = 0;;) {
 539                 if (*pattern == EOS) {          /* End of pattern? */
 540                         *pathend = EOS;
 541                         if (g_lstat(pathbuf, &sb, pglob))
 542                                 return(0);
 543
 544                         if (((pglob->gl_flags & GLOB_MARK) &&
 545                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 546                             || (S_ISLNK(sb.st_mode) &&
 547                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 548                             S_ISDIR(sb.st_mode)))) {
 549                                 *pathend++ = SEP;
 550                                 *pathend = EOS;
 551                         }
 552                         ++pglob->gl_matchc;
 553                         return(globextend(pathbuf, pglob));
 554                 }
 555
 556                 /* Find end of next segment, copy tentatively to pathend. */
 557                 q = pathend;
 558                 p = pattern;
 559                 while (*p != EOS && *p != SEP) {
 560                         if (ismeta(*p))
 561                                 anymeta = 1;
 562                         *q++ = *p++;
 563                 }
 564
 565                 if (!anymeta) {         /* No expansion, do next segment. */
 566                         pathend = q;
 567                         pattern = p;
 568                         while (*pattern == SEP)
 569                                 *pathend++ = *pattern++;
 570                 } else                  /* Need expansion, recurse. */
 571                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 572         }
 573         /* NOTREACHED */
 574 }
 575
 576 static int
 577 glob3(pathbuf, pathend, pattern, restpattern, pglob)
 578         Char *pathbuf, *pathend, *pattern, *restpattern;
 579         glob_t *pglob;
 580 {
 581         register struct dirent *dp;
 582         DIR *dirp;
 583         int err;
 584         char buf[MAXPATHLEN];
 585
 586         /*
 587          * The readdirfunc declaration can't be prototyped, because it is
 588          * assigned, below, to two functions which are prototyped in glob.h
 589          * and dirent.h as taking pointers to differently typed opaque
 590          * structures.
 591          */
 592         struct dirent *(*readdirfunc)();
 593
 594         *pathend = EOS;
 595         errno = 0;
 596
 597         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 598                 /* TODO: don't call for ENOENT or ENOTDIR? */
 599                 if (pglob->gl_errfunc) {
 600                         g_Ctoc(pathbuf, buf);
 601                         if (pglob->gl_errfunc(buf, errno) ||
 602                             pglob->gl_flags & GLOB_ERR)
 603                                 return (GLOB_ABEND);
 604                 }
 605                 return(0);
 606         }
 607
 608         err = 0;
 609
 610         /* Search directory for matching names. */
 611         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 612                 readdirfunc = pglob->gl_readdir;
 613         else
 614                 readdirfunc = readdir;
 615         while ((dp = (*readdirfunc)(dirp))) {
 616                 register u_char *sc;
 617                 register Char *dc;
 618
 619                 /* Initial DOT must be matched literally. */
 620                 if (dp->d_name[0] == DOT && *pattern != DOT)
 621                         continue;
 622                 for (sc = (u_char *) dp->d_name, dc = pathend;
 623                      (*dc++ = *sc++) != EOS;)
 624                         continue;
 625                 if (!match(pathend, pattern, restpattern)) {
 626                         *pathend = EOS;
 627                         continue;
 628                 }
 629                 err = glob2(pathbuf, --dc, restpattern, pglob);
 630                 if (err)
 631                         break;
 632         }
 633
 634         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 635                 (*pglob->gl_closedir)(dirp);
 636         else
 637                 closedir(dirp);
 638         return(err);
 639 }
 640
 641
 642 /*
 643  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 644  * add the new item, and update gl_pathc.
 645  *
 646  * This assumes the BSD realloc, which only copies the block when its size
 647  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 648  * behavior.
 649  *
 650  * Return 0 if new item added, error code if memory couldn't be allocated.
 651  *
 652  * Invariant of the glob_t structure:
 653  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 654  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 655  */
 656 static int
 657 globextend(path, pglob)
 658         const Char *path;
 659         glob_t *pglob;
 660 {
 661         register char **pathv;
 662         register int i;
 663         u_int newsize;
 664         char *copy;
 665         const Char *p;
 666
 667         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 668         pathv = pglob->gl_pathv ?
 669                     realloc((char *)pglob->gl_pathv, newsize) :
 670                     malloc(newsize);
 671         if (pathv == NULL)
 672                 return(GLOB_NOSPACE);
 673
 674         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 675                 /* first time around -- clear initial gl_offs items */
 676                 pathv += pglob->gl_offs;
 677                 for (i = pglob->gl_offs; --i >= 0; )
 678                         *--pathv = NULL;
 679         }
 680         pglob->gl_pathv = pathv;
 681
 682         for (p = path; *p++;)
 683                 continue;
 684         if ((copy = malloc(p - path)) != NULL) {
 685                 g_Ctoc(path, copy);
 686                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 687         }
 688         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 689         return(copy == NULL ? GLOB_NOSPACE : 0);
 690 }
 691
 692
 693 /*
 694  * pattern matching function for filenames.  Each occurrence of the *
 695  * pattern causes a recursion level.
 696  */
 697 static int
 698 match(name, pat, patend)
 699         register Char *name, *pat, *patend;
 700 {
 701         int ok, negate_range;
 702         Char c, k;
 703
 704         while (pat < patend) {
 705                 c = *pat++;
 706                 switch (c & M_MASK) {
 707                 case M_ALL:
 708                         if (pat == patend)
 709                                 return(1);
 710                         do
 711                             if (match(name, pat, patend))
 712                                     return(1);
 713                         while (*name++ != EOS);
 714                         return(0);
 715                 case M_ONE:
 716                         if (*name++ == EOS)
 717                                 return(0);
 718                         break;
 719                 case M_SET:
 720                         ok = 0;
 721                         if ((k = *name++) == EOS)
 722                                 return(0);
 723                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 724                                 ++pat;
 725                         while (((c = *pat++) & M_MASK) != M_END)
 726                                 if ((*pat & M_MASK) == M_RNG) {
 727                                         if (c <= k && k <= pat[1])
 728                                                 ok = 1;
 729                                         pat += 2;
 730                                 } else if (c == k)
 731                                         ok = 1;
 732                         if (ok == negate_range)
 733                                 return(0);
 734                         break;
 735                 default:
 736                         if (*name++ != c)
 737                                 return(0);
 738                         break;
 739                 }
 740         }
 741         return(*name == EOS);
 742 }
 743
 744 /* Free allocated data belonging to a glob_t structure. */
 745 void
 746 globfree(pglob)
 747         glob_t *pglob;
 748 {
 749         register int i;
 750         register char **pp;
 751
 752         if (pglob->gl_pathv != NULL) {
 753                 pp = pglob->gl_pathv + pglob->gl_offs;
 754                 for (i = pglob->gl_pathc; i--; ++pp)
 755                         if (*pp)
 756                                 free(*pp);
 757                 free(pglob->gl_pathv);
 758         }
 759 }
 760
 761 static DIR *
 762 g_opendir(str, pglob)
 763         register Char *str;
 764         glob_t *pglob;
 765 {
 766         char buf[MAXPATHLEN];
 767
 768         if (!*str)
 769                 strcpy(buf, ".");
 770         else
 771                 g_Ctoc(str, buf);
 772
 773         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 774                 return((*pglob->gl_opendir)(buf));
 775
 776         return(opendir(buf));
 777 }
 778
 779 static int
 780 g_lstat(fn, sb, pglob)
 781         register Char *fn;
 782         struct stat *sb;
 783         glob_t *pglob;
 784 {
 785         char buf[MAXPATHLEN];
 786
 787         g_Ctoc(fn, buf);
 788         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 789                 return((*pglob->gl_lstat)(buf, sb));
 790         return(lstat(buf, sb));
 791 }
 792
 793 static int
 794 g_stat(fn, sb, pglob)
 795         register Char *fn;
 796         struct stat *sb;
 797         glob_t *pglob;
 798 {
 799         char buf[MAXPATHLEN];
 800
 801         g_Ctoc(fn, buf);
 802         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 803                 return((*pglob->gl_stat)(buf, sb));
 804         return(stat(buf, sb));
 805 }
 806
 807 static Char *
 808 g_strchr(str, ch)
 809         Char *str;
 810         int ch;
 811 {
 812         do {
 813                 if (*str == ch)
 814                         return (str);
 815         } while (*str++);
 816         return (NULL);
 817 }
 818
 819 #ifdef notdef
 820 static Char *
 821 g_strcat(dst, src)
 822         Char *dst;
 823         const Char* src;
 824 {
 825         Char *sdst = dst;
 826
 827         while (*dst++)
 828                 continue;
 829         --dst;
 830         while((*dst++ = *src++) != EOS)
 831             continue;
 832
 833         return (sdst);
 834 }
 835 #endif
 836
 837 static void
 838 g_Ctoc(str, buf)
 839         register const Char *str;
 840         char *buf;
 841 {
 842         register char *dc;
 843
 844         for (dc = buf; (*dc++ = *str++) != EOS;)
 845                 continue;
 846 }
 847
 848 #ifdef DEBUG
 849 static void
 850 qprintf(str, s)
 851         const char *str;
 852         register Char *s;
 853 {
 854         register Char *p;
 855
 856         (void)printf("%s:\n", str);
 857         for (p = s; *p; p++)
 858                 (void)printf("%c", CHAR(*p));
 859         (void)printf("\n");
 860         for (p = s; *p; p++)
 861                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 862         (void)printf("\n");
 863         for (p = s; *p; p++)
 864                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 865         (void)printf("\n");
 866 }
 867 #endif