gen/glob.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1989, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * This code is derived from software contributed to Berkeley by
  27  * Guido van Rossum.
  28  *
  29  * Redistribution and use in source and binary forms, with or without
  30  * modification, are permitted provided that the following conditions
  31  * are met:
  32  * 1. Redistributions of source code must retain the above copyright
  33  *    notice, this list of conditions and the following disclaimer.
  34  * 2. Redistributions in binary form must reproduce the above copyright
  35  *    notice, this list of conditions and the following disclaimer in the
  36  *    documentation and/or other materials provided with the distribution.
  37  * 3. All advertising materials mentioning features or use of this software
  38  *    must display the following acknowledgement:
  39  *      This product includes software developed by the University of
  40  *      California, Berkeley and its contributors.
  41  * 4. Neither the name of the University nor the names of its contributors
  42  *    may be used to endorse or promote products derived from this software
  43  *    without specific prior written permission.
  44  *
  45  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  46  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  47  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  48  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  49  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  50  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  51  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  52  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  53  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  54  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  55  * SUCH DAMAGE.
  56  */
  57
  58
  59 /*
  60  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  61  *
  62  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  63  *
  64  * Optional extra services, controlled by flags not defined by POSIX:
  65  *
  66  * GLOB_QUOTE:
  67  *      Escaping convention: \ inhibits any special meaning the following
  68  *      character might have (except \ at end of string is retained).
  69  * GLOB_MAGCHAR:
  70  *      Set in gl_flags if pattern contained a globbing character.
  71  * GLOB_NOMAGIC:
  72  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  73  *      not contain any magic characters.  [Used in csh style globbing]
  74  * GLOB_ALTDIRFUNC:
  75  *      Use alternately specified directory access functions.
  76  * GLOB_TILDE:
  77  *      expand ~user/foo to the /home/dir/of/user/foo
  78  * GLOB_BRACE:
  79  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  80  * gl_matchc:
  81  *      Number of matches in the current invocation of glob.
  82  */
  83
  84 #include <sys/param.h>
  85 #include <sys/stat.h>
  86
  87 #include <ctype.h>
  88 #include <dirent.h>
  89 #include <errno.h>
  90 #include <glob.h>
  91 #include <pwd.h>
  92 #include <stdio.h>
  93 #include <stdlib.h>
  94 #include <string.h>
  95 #include <unistd.h>
  96
  97 #define DOLLAR          '$'
  98 #define DOT             '.'
  99 #define EOS             '\0'
 100 #define LBRACKET        '['
 101 #define NOT             '!'
 102 #define QUESTION        '?'
 103 #define QUOTE           '\\'
 104 #define RANGE           '-'
 105 #define RBRACKET        ']'
 106 #define SEP             '/'
 107 #define STAR            '*'
 108 #define TILDE           '~'
 109 #define UNDERSCORE      '_'
 110 #define LBRACE          '{'
 111 #define RBRACE          '}'
 112 #define SLASH           '/'
 113 #define COMMA           ','
 114
 115 #ifndef DEBUG
 116
 117 #define M_QUOTE         0x8000
 118 #define M_PROTECT       0x4000
 119 #define M_MASK          0xffff
 120 #define M_ASCII         0x00ff
 121
 122 typedef u_short Char;
 123
 124 #else
 125
 126 #define M_QUOTE         0x80
 127 #define M_PROTECT       0x40
 128 #define M_MASK          0xff
 129 #define M_ASCII         0x7f
 130
 131 typedef char Char;
 132
 133 #endif
 134
 135
 136 #define CHAR(c)         ((Char)((c)&M_ASCII))
 137 #define META(c)         ((Char)((c)|M_QUOTE))
 138 #define M_ALL           META('*')
 139 #define M_END           META(']')
 140 #define M_NOT           META('!')
 141 #define M_ONE           META('?')
 142 #define M_RNG           META('-')
 143 #define M_SET           META('[')
 144 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 145
 146
 147 static int       compare __P((const void *, const void *));
 148 static void      g_Ctoc __P((const Char *, char *));
 149 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 150 static DIR      *g_opendir __P((Char *, glob_t *));
 151 static Char     *g_strchr __P((Char *, int));
 152 #ifdef notdef
 153 static Char     *g_strcat __P((Char *, const Char *));
 154 #endif
 155 static int       g_stat __P((Char *, struct stat *, glob_t *));
 156 static int       glob0 __P((const Char *, glob_t *));
 157 static int       glob1 __P((Char *, glob_t *));
 158 static int       glob2 __P((Char *, Char *, Char *, glob_t *));
 159 static int       glob3 __P((Char *, Char *, Char *, Char *, glob_t *));
 160 static int       globextend __P((const Char *, glob_t *));
 161 static const Char *      globtilde __P((const Char *, Char *, glob_t *));
 162 static int       globexp1 __P((const Char *, glob_t *));
 163 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *));
 164 static int       match __P((Char *, Char *, Char *));
 165 #ifdef DEBUG
 166 static void      qprintf __P((const char *, Char *));
 167 #endif
 168
 169 int
 170 glob(pattern, flags, errfunc, pglob)
 171         const char *pattern;
 172         int flags, (*errfunc) __P((const char *, int));
 173         glob_t *pglob;
 174 {
 175         const u_char *patnext;
 176         int c;
 177         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 178
 179         patnext = (u_char *) pattern;
 180         if (!(flags & GLOB_APPEND)) {
 181                 pglob->gl_pathc = 0;
 182                 pglob->gl_pathv = NULL;
 183                 if (!(flags & GLOB_DOOFFS))
 184                         pglob->gl_offs = 0;
 185         }
 186         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 187         pglob->gl_errfunc = errfunc;
 188         pglob->gl_matchc = 0;
 189
 190         bufnext = patbuf;
 191         bufend = bufnext + MAXPATHLEN;
 192         if (flags & GLOB_QUOTE) {
 193                 /* Protect the quoted characters. */
 194                 while (bufnext < bufend && (c = *patnext++) != EOS)
 195                         if (c == QUOTE) {
 196                                 if ((c = *patnext++) == EOS) {
 197                                         c = QUOTE;
 198                                         --patnext;
 199                                 }
 200                                 *bufnext++ = c | M_PROTECT;
 201                         }
 202                         else
 203                                 *bufnext++ = c;
 204         }
 205         else
 206             while (bufnext < bufend && (c = *patnext++) != EOS)
 207                     *bufnext++ = c;
 208         *bufnext = EOS;
 209
 210         if (flags & GLOB_BRACE)
 211             return globexp1(patbuf, pglob);
 212         else
 213             return glob0(patbuf, pglob);
 214 }
 215
 216 /*
 217  * Expand recursively a glob {} pattern. When there is no more expansion
 218  * invoke the standard globbing routine to glob the rest of the magic
 219  * characters
 220  */
 221 static int globexp1(pattern, pglob)
 222         const Char *pattern;
 223         glob_t *pglob;
 224 {
 225         const Char* ptr = pattern;
 226         int rv;
 227
 228         /* Protect a single {}, for find(1), like csh */
 229         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 230                 return glob0(pattern, pglob);
 231
 232         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 233                 if (!globexp2(ptr, pattern, pglob, &rv))
 234                         return rv;
 235
 236         return glob0(pattern, pglob);
 237 }
 238
 239
 240 /*
 241  * Recursive brace globbing helper. Tries to expand a single brace.
 242  * If it succeeds then it invokes globexp1 with the new pattern.
 243  * If it fails then it tries to glob the rest of the pattern and returns.
 244  */
 245 static int globexp2(ptr, pattern, pglob, rv)
 246         const Char *ptr, *pattern;
 247         glob_t *pglob;
 248         int *rv;
 249 {
 250         int     i;
 251         Char   *lm, *ls;
 252         const Char *pe, *pm, *pl;
 253         Char    patbuf[MAXPATHLEN + 1];
 254
 255         /* copy part up to the brace */
 256         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 257                 continue;
 258         ls = lm;
 259
 260         /* Find the balanced brace */
 261         for (i = 0, pe = ++ptr; *pe; pe++)
 262                 if (*pe == LBRACKET) {
 263                         /* Ignore everything between [] */
 264                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 265                                 continue;
 266                         if (*pe == EOS) {
 267                                 /*
 268                                  * We could not find a matching RBRACKET.
 269                                  * Ignore and just look for RBRACE
 270                                  */
 271                                 pe = pm;
 272                         }
 273                 }
 274                 else if (*pe == LBRACE)
 275                         i++;
 276                 else if (*pe == RBRACE) {
 277                         if (i == 0)
 278                                 break;
 279                         i--;
 280                 }
 281
 282         /* Non matching braces; just glob the pattern */
 283         if (i != 0 || *pe == EOS) {
 284                 *rv = glob0(patbuf, pglob);
 285                 return 0;
 286         }
 287
 288         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 289                 switch (*pm) {
 290                 case LBRACKET:
 291                         /* Ignore everything between [] */
 292                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 293                                 continue;
 294                         if (*pm == EOS) {
 295                                 /*
 296                                  * We could not find a matching RBRACKET.
 297                                  * Ignore and just look for RBRACE
 298                                  */
 299                                 pm = pl;
 300                         }
 301                         break;
 302
 303                 case LBRACE:
 304                         i++;
 305                         break;
 306
 307                 case RBRACE:
 308                         if (i) {
 309                             i--;
 310                             break;
 311                         }
 312                         /* FALLTHROUGH */
 313                 case COMMA:
 314                         if (i && *pm == COMMA)
 315                                 break;
 316                         else {
 317                                 /* Append the current string */
 318                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 319                                         continue;
 320                                 /*
 321                                  * Append the rest of the pattern after the
 322                                  * closing brace
 323                                  */
 324                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 325                                         continue;
 326
 327                                 /* Expand the current pattern */
 328 #ifdef DEBUG
 329                                 qprintf("globexp2:", patbuf);
 330 #endif
 331                                 *rv = globexp1(patbuf, pglob);
 332
 333                                 /* move after the comma, to the next string */
 334                                 pl = pm + 1;
 335                         }
 336                         break;
 337
 338                 default:
 339                         break;
 340                 }
 341         *rv = 0;
 342         return 0;
 343 }
 344
 345
 346
 347 /*
 348  * expand tilde from the passwd file.
 349  */
 350 static const Char *
 351 globtilde(pattern, patbuf, pglob)
 352         const Char *pattern;
 353         Char *patbuf;
 354         glob_t *pglob;
 355 {
 356         struct passwd *pwd;
 357         char *h;
 358         const Char *p;
 359         Char *b;
 360
 361         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 362                 return pattern;
 363
 364         /* Copy up to the end of the string or / */
 365         for (p = pattern + 1, h = (char *) patbuf; *p && *p != SLASH;
 366              *h++ = *p++)
 367                 continue;
 368
 369         *h = EOS;
 370
 371         if (((char *) patbuf)[0] == EOS) {
 372                 /*
 373                  * handle a plain ~ or ~/ by expanding $HOME
 374                  * first and then trying the password file
 375                  */
 376                 if ((h = getenv("HOME")) == NULL) {
 377                         if ((pwd = getpwuid(getuid())) == NULL)
 378                                 return pattern;
 379                         else
 380                                 h = pwd->pw_dir;
 381                 }
 382         }
 383         else {
 384                 /*
 385                  * Expand a ~user
 386                  */
 387                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 388                         return pattern;
 389                 else
 390                         h = pwd->pw_dir;
 391         }
 392
 393         /* Copy the home directory */
 394         for (b = patbuf; *h; *b++ = *h++)
 395                 continue;
 396
 397         /* Append the rest of the pattern */
 398         while ((*b++ = *p++) != EOS)
 399                 continue;
 400
 401         return patbuf;
 402 }
 403
 404
 405 /*
 406  * The main glob() routine: compiles the pattern (optionally processing
 407  * quotes), calls glob1() to do the real pattern matching, and finally
 408  * sorts the list (unless unsorted operation is requested).  Returns 0
 409  * if things went well, nonzero if errors occurred.  It is not an error
 410  * to find no matches.
 411  */
 412 static int
 413 glob0(pattern, pglob)
 414         const Char *pattern;
 415         glob_t *pglob;
 416 {
 417         const Char *qpatnext;
 418         int c, err, oldpathc;
 419         Char *bufnext, patbuf[MAXPATHLEN+1];
 420
 421         qpatnext = globtilde(pattern, patbuf, pglob);
 422         oldpathc = pglob->gl_pathc;
 423         bufnext = patbuf;
 424
 425         /* We don't need to check for buffer overflow any more. */
 426         while ((c = *qpatnext++) != EOS) {
 427                 switch (c) {
 428                 case LBRACKET:
 429                         c = *qpatnext;
 430                         if (c == NOT)
 431                                 ++qpatnext;
 432                         if (*qpatnext == EOS ||
 433                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 434                                 *bufnext++ = LBRACKET;
 435                                 if (c == NOT)
 436                                         --qpatnext;
 437                                 break;
 438                         }
 439                         *bufnext++ = M_SET;
 440                         if (c == NOT)
 441                                 *bufnext++ = M_NOT;
 442                         c = *qpatnext++;
 443                         do {
 444                                 *bufnext++ = CHAR(c);
 445                                 if (*qpatnext == RANGE &&
 446                                     (c = qpatnext[1]) != RBRACKET) {
 447                                         *bufnext++ = M_RNG;
 448                                         *bufnext++ = CHAR(c);
 449                                         qpatnext += 2;
 450                                 }
 451                         } while ((c = *qpatnext++) != RBRACKET);
 452                         pglob->gl_flags |= GLOB_MAGCHAR;
 453                         *bufnext++ = M_END;
 454                         break;
 455                 case QUESTION:
 456                         pglob->gl_flags |= GLOB_MAGCHAR;
 457                         *bufnext++ = M_ONE;
 458                         break;
 459                 case STAR:
 460                         pglob->gl_flags |= GLOB_MAGCHAR;
 461                         /* collapse adjacent stars to one,
 462                          * to avoid exponential behavior
 463                          */
 464                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 465                             *bufnext++ = M_ALL;
 466                         break;
 467                 default:
 468                         *bufnext++ = CHAR(c);
 469                         break;
 470                 }
 471         }
 472         *bufnext = EOS;
 473 #ifdef DEBUG
 474         qprintf("glob0:", patbuf);
 475 #endif
 476
 477         if ((err = glob1(patbuf, pglob)) != 0)
 478                 return(err);
 479
 480         /*
 481          * If there was no match we are going to append the pattern
 482          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 483          * and the pattern did not contain any magic characters
 484          * GLOB_NOMAGIC is there just for compatibility with csh.
 485          */
 486         if (pglob->gl_pathc == oldpathc &&
 487             ((pglob->gl_flags & GLOB_NOCHECK) ||
 488               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 489                !(pglob->gl_flags & GLOB_MAGCHAR))))
 490                 return(globextend(pattern, pglob));
 491         else if (!(pglob->gl_flags & GLOB_NOSORT))
 492                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 493                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 494         return(0);
 495 }
 496
 497 static int
 498 compare(p, q)
 499         const void *p, *q;
 500 {
 501         return(strcmp(*(char **)p, *(char **)q));
 502 }
 503
 504 static int
 505 glob1(pattern, pglob)
 506         Char *pattern;
 507         glob_t *pglob;
 508 {
 509         Char pathbuf[MAXPATHLEN+1];
 510
 511         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 512         if (*pattern == EOS)
 513                 return(0);
 514         return(glob2(pathbuf, pathbuf, pattern, pglob));
 515 }
 516
 517 /*
 518  * The functions glob2 and glob3 are mutually recursive; there is one level
 519  * of recursion for each segment in the pattern that contains one or more
 520  * meta characters.
 521  */
 522 static int
 523 glob2(pathbuf, pathend, pattern, pglob)
 524         Char *pathbuf, *pathend, *pattern;
 525         glob_t *pglob;
 526 {
 527         struct stat sb;
 528         Char *p, *q;
 529         int anymeta;
 530
 531         /*
 532          * Loop over pattern segments until end of pattern or until
 533          * segment with meta character found.
 534          */
 535         for (anymeta = 0;;) {
 536                 if (*pattern == EOS) {          /* End of pattern? */
 537                         *pathend = EOS;
 538                         if (g_lstat(pathbuf, &sb, pglob))
 539                                 return(0);
 540
 541                         if (((pglob->gl_flags & GLOB_MARK) &&
 542                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 543                             || (S_ISLNK(sb.st_mode) &&
 544                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 545                             S_ISDIR(sb.st_mode)))) {
 546                                 *pathend++ = SEP;
 547                                 *pathend = EOS;
 548                         }
 549                         ++pglob->gl_matchc;
 550                         return(globextend(pathbuf, pglob));
 551                 }
 552
 553                 /* Find end of next segment, copy tentatively to pathend. */
 554                 q = pathend;
 555                 p = pattern;
 556                 while (*p != EOS && *p != SEP) {
 557                         if (ismeta(*p))
 558                                 anymeta = 1;
 559                         *q++ = *p++;
 560                 }
 561
 562                 if (!anymeta) {         /* No expansion, do next segment. */
 563                         pathend = q;
 564                         pattern = p;
 565                         while (*pattern == SEP)
 566                                 *pathend++ = *pattern++;
 567                 } else                  /* Need expansion, recurse. */
 568                         return(glob3(pathbuf, pathend, pattern, p, pglob));
 569         }
 570         /* NOTREACHED */
 571 }
 572
 573 static int
 574 glob3(pathbuf, pathend, pattern, restpattern, pglob)
 575         Char *pathbuf, *pathend, *pattern, *restpattern;
 576         glob_t *pglob;
 577 {
 578         register struct dirent *dp;
 579         DIR *dirp;
 580         int err;
 581         char buf[MAXPATHLEN];
 582
 583         /*
 584          * The readdirfunc declaration can't be prototyped, because it is
 585          * assigned, below, to two functions which are prototyped in glob.h
 586          * and dirent.h as taking pointers to differently typed opaque
 587          * structures.
 588          */
 589         struct dirent *(*readdirfunc)();
 590
 591         *pathend = EOS;
 592         errno = 0;
 593
 594         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 595                 /* TODO: don't call for ENOENT or ENOTDIR? */
 596                 if (pglob->gl_errfunc) {
 597                         g_Ctoc(pathbuf, buf);
 598                         if (pglob->gl_errfunc(buf, errno) ||
 599                             pglob->gl_flags & GLOB_ERR)
 600                                 return (GLOB_ABEND);
 601                 }
 602                 return(0);
 603         }
 604
 605         err = 0;
 606
 607         /* Search directory for matching names. */
 608         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 609                 readdirfunc = pglob->gl_readdir;
 610         else
 611                 readdirfunc = readdir;
 612         while ((dp = (*readdirfunc)(dirp))) {
 613                 register u_char *sc;
 614                 register Char *dc;
 615
 616                 /* Initial DOT must be matched literally. */
 617                 if (dp->d_name[0] == DOT && *pattern != DOT)
 618                         continue;
 619                 for (sc = (u_char *) dp->d_name, dc = pathend;
 620                      (*dc++ = *sc++) != EOS;)
 621                         continue;
 622                 if (!match(pathend, pattern, restpattern)) {
 623                         *pathend = EOS;
 624                         continue;
 625                 }
 626                 err = glob2(pathbuf, --dc, restpattern, pglob);
 627                 if (err)
 628                         break;
 629         }
 630
 631         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 632                 (*pglob->gl_closedir)(dirp);
 633         else
 634                 closedir(dirp);
 635         return(err);
 636 }
 637
 638
 639 /*
 640  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 641  * add the new item, and update gl_pathc.
 642  *
 643  * This assumes the BSD realloc, which only copies the block when its size
 644  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 645  * behavior.
 646  *
 647  * Return 0 if new item added, error code if memory couldn't be allocated.
 648  *
 649  * Invariant of the glob_t structure:
 650  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 651  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 652  */
 653 static int
 654 globextend(path, pglob)
 655         const Char *path;
 656         glob_t *pglob;
 657 {
 658         register char **pathv;
 659         register int i;
 660         u_int newsize;
 661         char *copy;
 662         const Char *p;
 663
 664         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 665         pathv = pglob->gl_pathv ?
 666                     realloc((char *)pglob->gl_pathv, newsize) :
 667                     malloc(newsize);
 668         if (pathv == NULL)
 669                 return(GLOB_NOSPACE);
 670
 671         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 672                 /* first time around -- clear initial gl_offs items */
 673                 pathv += pglob->gl_offs;
 674                 for (i = pglob->gl_offs; --i >= 0; )
 675                         *--pathv = NULL;
 676         }
 677         pglob->gl_pathv = pathv;
 678
 679         for (p = path; *p++;)
 680                 continue;
 681         if ((copy = malloc(p - path)) != NULL) {
 682                 g_Ctoc(path, copy);
 683                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 684         }
 685         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 686         return(copy == NULL ? GLOB_NOSPACE : 0);
 687 }
 688
 689
 690 /*
 691  * pattern matching function for filenames.  Each occurrence of the *
 692  * pattern causes a recursion level.
 693  */
 694 static int
 695 match(name, pat, patend)
 696         register Char *name, *pat, *patend;
 697 {
 698         int ok, negate_range;
 699         Char c, k;
 700
 701         while (pat < patend) {
 702                 c = *pat++;
 703                 switch (c & M_MASK) {
 704                 case M_ALL:
 705                         if (pat == patend)
 706                                 return(1);
 707                         do
 708                             if (match(name, pat, patend))
 709                                     return(1);
 710                         while (*name++ != EOS);
 711                         return(0);
 712                 case M_ONE:
 713                         if (*name++ == EOS)
 714                                 return(0);
 715                         break;
 716                 case M_SET:
 717                         ok = 0;
 718                         if ((k = *name++) == EOS)
 719                                 return(0);
 720                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 721                                 ++pat;
 722                         while (((c = *pat++) & M_MASK) != M_END)
 723                                 if ((*pat & M_MASK) == M_RNG) {
 724                                         if (c <= k && k <= pat[1])
 725                                                 ok = 1;
 726                                         pat += 2;
 727                                 } else if (c == k)
 728                                         ok = 1;
 729                         if (ok == negate_range)
 730                                 return(0);
 731                         break;
 732                 default:
 733                         if (*name++ != c)
 734                                 return(0);
 735                         break;
 736                 }
 737         }
 738         return(*name == EOS);
 739 }
 740
 741 /* Free allocated data belonging to a glob_t structure. */
 742 void
 743 globfree(pglob)
 744         glob_t *pglob;
 745 {
 746         register int i;
 747         register char **pp;
 748
 749         if (pglob->gl_pathv != NULL) {
 750                 pp = pglob->gl_pathv + pglob->gl_offs;
 751                 for (i = pglob->gl_pathc; i--; ++pp)
 752                         if (*pp)
 753                                 free(*pp);
 754                 free(pglob->gl_pathv);
 755         }
 756 }
 757
 758 static DIR *
 759 g_opendir(str, pglob)
 760         register Char *str;
 761         glob_t *pglob;
 762 {
 763         char buf[MAXPATHLEN];
 764
 765         if (!*str)
 766                 strcpy(buf, ".");
 767         else
 768                 g_Ctoc(str, buf);
 769
 770         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 771                 return((*pglob->gl_opendir)(buf));
 772
 773         return(opendir(buf));
 774 }
 775
 776 static int
 777 g_lstat(fn, sb, pglob)
 778         register Char *fn;
 779         struct stat *sb;
 780         glob_t *pglob;
 781 {
 782         char buf[MAXPATHLEN];
 783
 784         g_Ctoc(fn, buf);
 785         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 786                 return((*pglob->gl_lstat)(buf, sb));
 787         return(lstat(buf, sb));
 788 }
 789
 790 static int
 791 g_stat(fn, sb, pglob)
 792         register Char *fn;
 793         struct stat *sb;
 794         glob_t *pglob;
 795 {
 796         char buf[MAXPATHLEN];
 797
 798         g_Ctoc(fn, buf);
 799         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 800                 return((*pglob->gl_stat)(buf, sb));
 801         return(stat(buf, sb));
 802 }
 803
 804 static Char *
 805 g_strchr(str, ch)
 806         Char *str;
 807         int ch;
 808 {
 809         do {
 810                 if (*str == ch)
 811                         return (str);
 812         } while (*str++);
 813         return (NULL);
 814 }
 815
 816 #ifdef notdef
 817 static Char *
 818 g_strcat(dst, src)
 819         Char *dst;
 820         const Char* src;
 821 {
 822         Char *sdst = dst;
 823
 824         while (*dst++)
 825                 continue;
 826         --dst;
 827         while((*dst++ = *src++) != EOS)
 828             continue;
 829
 830         return (sdst);
 831 }
 832 #endif
 833
 834 static void
 835 g_Ctoc(str, buf)
 836         register const Char *str;
 837         char *buf;
 838 {
 839         register char *dc;
 840
 841         for (dc = buf; (*dc++ = *str++) != EOS;)
 842                 continue;
 843 }
 844
 845 #ifdef DEBUG
 846 static void
 847 qprintf(str, s)
 848         const char *str;
 849         register Char *s;
 850 {
 851         register Char *p;
 852
 853         (void)printf("%s:\n", str);
 854         for (p = s; *p; p++)
 855                 (void)printf("%c", CHAR(*p));
 856         (void)printf("\n");
 857         for (p = s; *p; p++)
 858                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 859         (void)printf("\n");
 860         for (p = s; *p; p++)
 861                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 862         (void)printf("\n");
 863 }
 864 #endif