util.subproj/glob.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * Portions Copyright (c) 1999 Apple Computer, Inc.  All Rights
   7  * Reserved.  This file contains Original Code and/or Modifications of
   8  * Original Code as defined in and that are subject to the Apple Public
   9  * Source License Version 1.1 (the "License").  You may not use this file
  10  * except in compliance with the License.  Please obtain a copy of the
  11  * License at http://www.apple.com/publicsource and read it before using
  12  * this file.
  13  *
  14  * The Original Code and all software distributed under the License are
  15  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  16  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  17  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE OR NON- INFRINGEMENT.  Please see the
  19  * License for the specific language governing rights and limitations
  20  * under the License.
  21  *
  22  * @APPLE_LICENSE_HEADER_END@
  23  */
  24 /*
  25  * Copyright (c) 1995 NeXT Computer, Inc. All Rights Reserved
  26  *
  27  * Copyright (c) 1989, 1993
  28  *      The Regents of the University of California.  All rights reserved.
  29  *
  30  * This code is derived from software contributed to Berkeley by
  31  * Guido van Rossum.
  32  *
  33  * The NEXTSTEP Software License Agreement specifies the terms
  34  * and conditions for redistribution.
  35  *
  36  *      @(#)glob.c      8.3 (Berkeley) 10/13/93
  37  */
  38
  39 /*
  40  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  41  *
  42  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  43  *
  44  * Optional extra services, controlled by flags not defined by POSIX:
  45  *
  46  * GLOB_QUOTE:
  47  *      Escaping convention: \ inhibits any special meaning the following
  48  *      character might have (except \ at end of string is retained).
  49  * GLOB_MAGCHAR:
  50  *      Set in gl_flags if pattern contained a globbing character.
  51  * GLOB_NOMAGIC:
  52  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  53  *      not contain any magic characters.  [Used in csh style globbing]
  54  * GLOB_ALTDIRFUNC:
  55  *      Use alternately specified directory access functions.
  56  * GLOB_TILDE:
  57  *      expand ~user/foo to the /home/dir/of/user/foo
  58  * GLOB_BRACE:
  59  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  60  * gl_matchc:
  61  *      Number of matches in the current invocation of glob.
  62  */
  63
  64 #include <sys/param.h>
  65 #include <sys/stat.h>
  66
  67 #include <ctype.h>
  68 #include <dirent.h>
  69 #include <errno.h>
  70 #include <glob.h>
  71 #include <pwd.h>
  72 #include <stdio.h>
  73 #include <stdlib.h>
  74 #include <string.h>
  75 #include <unistd.h>
  76
  77 #define DOLLAR          '$'
  78 #define DOT             '.'
  79 #define EOS             '\0'
  80 #define LBRACKET        '['
  81 #define NOT             '!'
  82 #define QUESTION        '?'
  83 #define QUOTE           '\\'
  84 #define RANGE           '-'
  85 #define RBRACKET        ']'
  86 #define SEP             '/'
  87 #define STAR            '*'
  88 #define TILDE           '~'
  89 #define UNDERSCORE      '_'
  90 #define LBRACE          '{'
  91 #define RBRACE          '}'
  92 #define SLASH           '/'
  93 #define COMMA           ','
  94
  95 #ifndef DEBUG
  96
  97 #define M_QUOTE         0x8000
  98 #define M_PROTECT       0x4000
  99 #define M_MASK          0xffff
 100 #define M_ASCII         0x00ff
 101
 102 typedef u_short Char;
 103
 104 #else
 105
 106 #define M_QUOTE         0x80
 107 #define M_PROTECT       0x40
 108 #define M_MASK          0xff
 109 #define M_ASCII         0x7f
 110
 111 typedef char Char;
 112
 113 #endif
 114
 115
 116 #define CHAR(c)         ((Char)((c)&M_ASCII))
 117 #define META(c)         ((Char)((c)|M_QUOTE))
 118 #define M_ALL           META('*')
 119 #define M_END           META(']')
 120 #define M_NOT           META('!')
 121 #define M_ONE           META('?')
 122 #define M_RNG           META('-')
 123 #define M_SET           META('[')
 124 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 125
 126
 127 static int       compare __P((const void *, const void *));
 128 static int       g_Ctoc __P((const Char *, char *, u_int));
 129 static int       g_lstat __P((Char *, struct stat *, glob_t *));
 130 static DIR      *g_opendir __P((Char *, glob_t *));
 131 static Char     *g_strchr __P((Char *, int));
 132 #ifdef notdef
 133 static Char     *g_strcat __P((Char *, const Char *));
 134 #endif
 135 static int       g_stat __P((Char *, struct stat *, glob_t *));
 136 static int       glob0 __P((const Char *, glob_t *, int *));
 137 static int       glob1 __P((Char *, glob_t *, int *));
 138 static int       glob2 __P((Char *, Char *, Char *, Char *, glob_t *, int *));
 139 static int       glob3 __P((Char *, Char *, Char *, Char *, Char *, glob_t *, int *));
 140 static int       globextend __P((const Char *, glob_t *, int *));
 141 static const Char *
 142                  globtilde __P((const Char *, Char *, size_t, glob_t *));
 143 static int       globexp1 __P((const Char *, glob_t *, int *));
 144 static int       globexp2 __P((const Char *, const Char *, glob_t *, int *, int *));
 145 static int       match __P((Char *, Char *, Char *));
 146 #ifdef DEBUG
 147 static void      qprintf __P((const char *, Char *));
 148 #endif
 149
 150 int
 151 glob(pattern, flags, errfunc, pglob)
 152         const char *pattern;
 153         int flags, (*errfunc) __P((const char *, int));
 154         glob_t *pglob;
 155 {
 156         const u_char *patnext;
 157         int c, limit;
 158         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 159
 160         patnext = (u_char *) pattern;
 161         if (!(flags & GLOB_APPEND)) {
 162                 pglob->gl_pathc = 0;
 163                 pglob->gl_pathv = NULL;
 164                 if (!(flags & GLOB_DOOFFS))
 165                         pglob->gl_offs = 0;
 166         }
 167 #if !defined(GLOB_MAXPATH)
 168 #define GLOB_MAXPATH 0x1000
 169 #endif
 170         if (flags & GLOB_MAXPATH)
 171                 limit = pglob->gl_matchc;
 172         else
 173                 limit = 0;
 174         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 175         pglob->gl_errfunc = errfunc;
 176         pglob->gl_matchc = 0;
 177
 178         bufnext = patbuf;
 179         bufend = bufnext + MAXPATHLEN - 1;
 180         if (flags & GLOB_QUOTE) {
 181                 /* Protect the quoted characters. */
 182                 while (bufnext < bufend && (c = *patnext++) != EOS)
 183                         if (c == QUOTE) {
 184                                 if ((c = *patnext++) == EOS) {
 185                                         c = QUOTE;
 186                                         --patnext;
 187                                 }
 188                                 *bufnext++ = c | M_PROTECT;
 189                         }
 190                         else
 191                                 *bufnext++ = c;
 192         }
 193         else
 194             while (bufnext < bufend && (c = *patnext++) != EOS)
 195                     *bufnext++ = c;
 196         *bufnext = EOS;
 197
 198         if (flags & GLOB_BRACE)
 199             return globexp1(patbuf, pglob, &limit);
 200         else
 201             return glob0(patbuf, pglob, &limit);
 202 }
 203
 204 /*
 205  * Expand recursively a glob {} pattern. When there is no more expansion
 206  * invoke the standard globbing routine to glob the rest of the magic
 207  * characters
 208  */
 209 static int
 210 globexp1(pattern, pglob, limit)
 211         const Char *pattern;
 212         glob_t *pglob;
 213         int *limit;
 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, limit);
 221
 222         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 223                 if (!globexp2(ptr, pattern, pglob, &rv, limit))
 224                         return rv;
 225
 226         return glob0(pattern, pglob, limit);
 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
 236 globexp2(ptr, pattern, pglob, rv, limit)
 237         const Char *ptr, *pattern;
 238         glob_t *pglob;
 239         int *rv, *limit;
 240 {
 241         int     i;
 242         Char   *lm, *ls;
 243         const Char *pe, *pm, *pl;
 244         Char    patbuf[MAXPATHLEN];
 245
 246         /* copy part up to the brace */
 247         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 248                 continue;
 249         *lm = EOS;
 250         ls = lm;
 251
 252         /* Find the balanced brace */
 253         for (i = 0, pe = ++ptr; *pe; pe++)
 254                 if (*pe == LBRACKET) {
 255                         /* Ignore everything between [] */
 256                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 257                                 continue;
 258                         if (*pe == EOS) {
 259                                 /*
 260                                  * We could not find a matching RBRACKET.
 261                                  * Ignore and just look for RBRACE
 262                                  */
 263                                 pe = pm;
 264                         }
 265                 }
 266                 else if (*pe == LBRACE)
 267                         i++;
 268                 else if (*pe == RBRACE) {
 269                         if (i == 0)
 270                                 break;
 271                         i--;
 272                 }
 273
 274         /* Non matching braces; just glob the pattern */
 275         if (i != 0 || *pe == EOS) {
 276                 *rv = glob0(patbuf, pglob, limit);
 277                 return 0;
 278         }
 279
 280         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 281                 switch (*pm) {
 282                 case LBRACKET:
 283                         /* Ignore everything between [] */
 284                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 285                                 continue;
 286                         if (*pm == EOS) {
 287                                 /*
 288                                  * We could not find a matching RBRACKET.
 289                                  * Ignore and just look for RBRACE
 290                                  */
 291                                 pm = pl;
 292                         }
 293                         break;
 294
 295                 case LBRACE:
 296                         i++;
 297                         break;
 298
 299                 case RBRACE:
 300                         if (i) {
 301                             i--;
 302                             break;
 303                         }
 304                         /* FALLTHROUGH */
 305                 case COMMA:
 306                         if (i && *pm == COMMA)
 307                                 break;
 308                         else {
 309                                 /* Append the current string */
 310                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 311                                         continue;
 312                                 /*
 313                                  * Append the rest of the pattern after the
 314                                  * closing brace
 315                                  */
 316                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 317                                         continue;
 318
 319                                 /* Expand the current pattern */
 320 #ifdef DEBUG
 321                                 qprintf("globexp2:", patbuf);
 322 #endif
 323                                 *rv = globexp1(patbuf, pglob, limit);
 324
 325                                 /* move after the comma, to the next string */
 326                                 pl = pm + 1;
 327                         }
 328                         break;
 329
 330                 default:
 331                         break;
 332                 }
 333         *rv = 0;
 334         return 0;
 335 }
 336
 337
 338
 339 /*
 340  * expand tilde from the passwd file.
 341  */
 342 static const Char *
 343 globtilde(pattern, patbuf, patbuf_len, pglob)
 344         const Char *pattern;
 345         Char *patbuf;
 346         size_t patbuf_len;
 347         glob_t *pglob;
 348 {
 349         struct passwd *pwd;
 350         char *h;
 351         const Char *p;
 352         Char *b, *eb;
 353
 354         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 355                 return pattern;
 356
 357         /*
 358          * Copy up to the end of the string or /
 359          */
 360         eb = &patbuf[patbuf_len - 1];
 361         for (p = pattern + 1, h = (char *) patbuf;
 362             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 363                 continue;
 364
 365         *h = EOS;
 366
 367         if (((char *) patbuf)[0] == EOS) {
 368                 /*
 369                  * handle a plain ~ or ~/ by expanding $HOME first (iff
 370                  * we're not running setuid or setgid) and then trying
 371                  * the password file
 372                  */
 373                 if (
 374 #if 0
 375 #ifndef __NETBSD_SYSCALLS
 376                     issetugid() != 0 ||
 377 #endif
 378 #endif
 379                     (h = getenv("HOME")) == NULL) {
 380                         if (((h = getlogin()) != NULL &&
 381                              (pwd = getpwnam(h)) != NULL) ||
 382                             (pwd = getpwuid(getuid())) != NULL)
 383                                 h = pwd->pw_dir;
 384                         else
 385                                 return pattern;
 386                 }
 387         }
 388         else {
 389                 /*
 390                  * Expand a ~user
 391                  */
 392                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 393                         return pattern;
 394                 else
 395                         h = pwd->pw_dir;
 396         }
 397
 398         /* Copy the home directory */
 399         for (b = patbuf; b < eb && *h; *b++ = *h++)
 400                 continue;
 401
 402         /* Append the rest of the pattern */
 403         while (b < eb && (*b++ = *p++) != EOS)
 404                 continue;
 405         *b = EOS;
 406
 407         return patbuf;
 408 }
 409
 410
 411 /*
 412  * The main glob() routine: compiles the pattern (optionally processing
 413  * quotes), calls glob1() to do the real pattern matching, and finally
 414  * sorts the list (unless unsorted operation is requested).  Returns 0
 415  * if things went well, nonzero if errors occurred.  It is not an error
 416  * to find no matches.
 417  */
 418 static int
 419 glob0(pattern, pglob, limit)
 420         const Char *pattern;
 421         glob_t *pglob;
 422         int *limit;
 423 {
 424         const Char *qpatnext;
 425         int c, err, oldpathc;
 426         Char *bufnext, patbuf[MAXPATHLEN];
 427
 428         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 429         oldpathc = pglob->gl_pathc;
 430         bufnext = patbuf;
 431
 432         /* We don't need to check for buffer overflow any more. */
 433         while ((c = *qpatnext++) != EOS) {
 434                 switch (c) {
 435                 case LBRACKET:
 436                         c = *qpatnext;
 437                         if (c == NOT)
 438                                 ++qpatnext;
 439                         if (*qpatnext == EOS ||
 440                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 441                                 *bufnext++ = LBRACKET;
 442                                 if (c == NOT)
 443                                         --qpatnext;
 444                                 break;
 445                         }
 446                         *bufnext++ = M_SET;
 447                         if (c == NOT)
 448                                 *bufnext++ = M_NOT;
 449                         c = *qpatnext++;
 450                         do {
 451                                 *bufnext++ = CHAR(c);
 452                                 if (*qpatnext == RANGE &&
 453                                     (c = qpatnext[1]) != RBRACKET) {
 454                                         *bufnext++ = M_RNG;
 455                                         *bufnext++ = CHAR(c);
 456                                         qpatnext += 2;
 457                                 }
 458                         } while ((c = *qpatnext++) != RBRACKET);
 459                         pglob->gl_flags |= GLOB_MAGCHAR;
 460                         *bufnext++ = M_END;
 461                         break;
 462                 case QUESTION:
 463                         pglob->gl_flags |= GLOB_MAGCHAR;
 464                         *bufnext++ = M_ONE;
 465                         break;
 466                 case STAR:
 467                         pglob->gl_flags |= GLOB_MAGCHAR;
 468                         /* collapse adjacent stars to one,
 469                          * to avoid exponential behavior
 470                          */
 471                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 472                             *bufnext++ = M_ALL;
 473                         break;
 474                 default:
 475                         *bufnext++ = CHAR(c);
 476                         break;
 477                 }
 478         }
 479         *bufnext = EOS;
 480 #ifdef DEBUG
 481         qprintf("glob0:", patbuf);
 482 #endif
 483
 484         if ((err = glob1(patbuf, pglob, limit)) != 0)
 485                 return(err);
 486
 487         /*
 488          * If there was no match we are going to append the pattern
 489          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 490          * and the pattern did not contain any magic characters
 491          * GLOB_NOMAGIC is there just for compatibility with csh.
 492          */
 493         if (pglob->gl_pathc == oldpathc &&
 494             ((pglob->gl_flags & GLOB_NOCHECK) ||
 495               ((pglob->gl_flags & GLOB_NOMAGIC) &&
 496                !(pglob->gl_flags & GLOB_MAGCHAR))))
 497                 return(globextend(pattern, pglob, limit));
 498         else if (!(pglob->gl_flags & GLOB_NOSORT))
 499                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 500                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 501         return(0);
 502 }
 503
 504 static int
 505 compare(p, q)
 506         const void *p, *q;
 507 {
 508         return(strcmp(*(char **)p, *(char **)q));
 509 }
 510
 511 static int
 512 glob1(pattern, pglob, limit)
 513         Char *pattern;
 514         glob_t *pglob;
 515         int *limit;
 516 {
 517         Char pathbuf[MAXPATHLEN];
 518
 519         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 520         if (*pattern == EOS)
 521                 return(0);
 522         return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
 523             pattern, pglob, limit));
 524 }
 525
 526 /*
 527  * The functions glob2 and glob3 are mutually recursive; there is one level
 528  * of recursion for each segment in the pattern that contains one or more
 529  * meta characters.
 530  */
 531 static int
 532 glob2(pathbuf, pathend, pathend_last, pattern, pglob, limit)
 533         Char *pathbuf, *pathend, *pathend_last, *pattern;
 534         glob_t *pglob;
 535         int *limit;
 536 {
 537         struct stat sb;
 538         Char *p, *q;
 539         int anymeta;
 540
 541         /*
 542          * Loop over pattern segments until end of pattern or until
 543          * segment with meta character found.
 544          */
 545         for (anymeta = 0;;) {
 546                 if (*pattern == EOS) {          /* End of pattern? */
 547                         *pathend = EOS;
 548                         if (g_lstat(pathbuf, &sb, pglob))
 549                                 return(0);
 550
 551                         if (((pglob->gl_flags & GLOB_MARK) &&
 552                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 553                             || (S_ISLNK(sb.st_mode) &&
 554                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 555                             S_ISDIR(sb.st_mode)))) {
 556                                 if (pathend + 1 > pathend_last)
 557                                         return (1);
 558                                 *pathend++ = SEP;
 559                                 *pathend = EOS;
 560                         }
 561                         ++pglob->gl_matchc;
 562                         return(globextend(pathbuf, pglob, limit));
 563                 }
 564
 565                 /* Find end of next segment, copy tentatively to pathend. */
 566                 q = pathend;
 567                 p = pattern;
 568                 while (*p != EOS && *p != SEP) {
 569                         if (ismeta(*p))
 570                                 anymeta = 1;
 571                         if (q + 1 > pathend_last)
 572                                 return (1);
 573                         *q++ = *p++;
 574                 }
 575
 576                 if (!anymeta) {         /* No expansion, do next segment. */
 577                         pathend = q;
 578                         pattern = p;
 579                         while (*pattern == SEP) {
 580                                 if (pathend + 1 > pathend_last)
 581                                         return (1);
 582                                 *pathend++ = *pattern++;
 583                         }
 584                 } else                  /* Need expansion, recurse. */
 585                         return(glob3(pathbuf, pathend, pathend_last, pattern, p,
 586                             pglob, limit));
 587         }
 588         /* NOTREACHED */
 589 }
 590
 591 static int
 592 glob3(pathbuf, pathend, pathend_last, pattern, restpattern, pglob, limit)
 593         Char *pathbuf, *pathend, *pathend_last, *pattern, *restpattern;
 594         glob_t *pglob;
 595         int *limit;
 596 {
 597         register struct dirent *dp;
 598         DIR *dirp;
 599         int err;
 600         char buf[MAXPATHLEN];
 601
 602         /*
 603          * The readdirfunc declaration can't be prototyped, because it is
 604          * assigned, below, to two functions which are prototyped in glob.h
 605          * and dirent.h as taking pointers to differently typed opaque
 606          * structures.
 607          */
 608         struct dirent *(*readdirfunc)();
 609
 610         if (pathend > pathend_last)
 611                 return (1);
 612         *pathend = EOS;
 613         errno = 0;
 614
 615         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 616                 /* TODO: don't call for ENOENT or ENOTDIR? */
 617                 if (pglob->gl_errfunc) {
 618                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 619                                 return (GLOB_ABEND);
 620                         if (pglob->gl_errfunc(buf, errno) ||
 621                             pglob->gl_flags & GLOB_ERR)
 622                                 return (GLOB_ABEND);
 623                 }
 624                 return(0);
 625         }
 626
 627         err = 0;
 628
 629         /* Search directory for matching names. */
 630         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 631                 readdirfunc = pglob->gl_readdir;
 632         else
 633                 readdirfunc = readdir;
 634         while ((dp = (*readdirfunc)(dirp))) {
 635                 register u_char *sc;
 636                 register Char *dc;
 637
 638                 /* Initial DOT must be matched literally. */
 639                 if (dp->d_name[0] == DOT && *pattern != DOT)
 640                         continue;
 641                 dc = pathend;
 642                 sc = (u_char *) dp->d_name;
 643                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 644                         ;
 645                 if (!match(pathend, pattern, restpattern)) {
 646                         *pathend = EOS;
 647                         continue;
 648                 }
 649                 err = glob2(pathbuf, --dc, pathend_last, restpattern,
 650                     pglob, limit);
 651                 if (err)
 652                         break;
 653         }
 654
 655         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 656                 (*pglob->gl_closedir)(dirp);
 657         else
 658                 closedir(dirp);
 659         return(err);
 660 }
 661
 662
 663 /*
 664  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 665  * add the new item, and update gl_pathc.
 666  *
 667  * This assumes the BSD realloc, which only copies the block when its size
 668  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 669  * behavior.
 670  *
 671  * Return 0 if new item added, error code if memory couldn't be allocated.
 672  *
 673  * Invariant of the glob_t structure:
 674  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 675  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 676  */
 677 static int
 678 globextend(path, pglob, limit)
 679         const Char *path;
 680         glob_t *pglob;
 681         int *limit;
 682 {
 683         register char **pathv;
 684         register int i;
 685         u_int newsize, len;
 686         char *copy;
 687         const Char *p;
 688
 689         if (*limit && pglob->gl_pathc > *limit)
 690 #if !defined(GLOB_LIMIT)
 691 #define GLOB_LIMIT (-3)
 692 #endif
 693                 return (GLOB_LIMIT);
 694
 695         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 696         pathv = pglob->gl_pathv ?
 697                     realloc((char *)pglob->gl_pathv, newsize) :
 698                     malloc(newsize);
 699         if (pathv == NULL) {
 700                 if (pglob->gl_pathv) {
 701                         free(pglob->gl_pathv);
 702                         pglob->gl_pathv = NULL;
 703                 }
 704                 return(GLOB_NOSPACE);
 705         }
 706
 707         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 708                 /* first time around -- clear initial gl_offs items */
 709                 pathv += pglob->gl_offs;
 710                 for (i = pglob->gl_offs; --i >= 0; )
 711                         *--pathv = NULL;
 712         }
 713         pglob->gl_pathv = pathv;
 714
 715         for (p = path; *p++;)
 716                 continue;
 717         len = (size_t)(p - path);
 718         if ((copy = malloc(len)) != NULL) {
 719                 if (g_Ctoc(path, copy, len)) {
 720                         free(copy);
 721                         return (GLOB_NOSPACE);
 722                 }
 723                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 724         }
 725         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 726         return(copy == NULL ? GLOB_NOSPACE : 0);
 727 }
 728
 729 /*
 730  * pattern matching function for filenames.  Each occurrence of the *
 731  * pattern causes a recursion level.
 732  */
 733 static int
 734 match(name, pat, patend)
 735         register Char *name, *pat, *patend;
 736 {
 737         int ok, negate_range;
 738         Char c, k;
 739
 740         while (pat < patend) {
 741                 c = *pat++;
 742                 switch (c & M_MASK) {
 743                 case M_ALL:
 744                         if (pat == patend)
 745                                 return(1);
 746                         do
 747                             if (match(name, pat, patend))
 748                                     return(1);
 749                         while (*name++ != EOS);
 750                         return(0);
 751                 case M_ONE:
 752                         if (*name++ == EOS)
 753                                 return(0);
 754                         break;
 755                 case M_SET:
 756                         ok = 0;
 757                         if ((k = *name++) == EOS)
 758                                 return(0);
 759                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 760                                 ++pat;
 761                         while (((c = *pat++) & M_MASK) != M_END)
 762                                 if ((*pat & M_MASK) == M_RNG) {
 763                                 if (c <= k && k <= pat[1])
 764                                         ok = 1;
 765                                 pat += 2;
 766                                 } else if (c == k)
 767                                         ok = 1;
 768                         if (ok == negate_range)
 769                                 return(0);
 770                         break;
 771                 default:
 772                         if (*name++ != c)
 773                                 return(0);
 774                         break;
 775                 }
 776         }
 777         return(*name == EOS);
 778 }
 779
 780 /* Free allocated data belonging to a glob_t structure. */
 781 void
 782 globfree(pglob)
 783         glob_t *pglob;
 784 {
 785         register int i;
 786         register char **pp;
 787
 788         if (pglob->gl_pathv != NULL) {
 789                 pp = pglob->gl_pathv + pglob->gl_offs;
 790                 for (i = pglob->gl_pathc; i--; ++pp)
 791                         if (*pp)
 792                                 free(*pp);
 793                 free(pglob->gl_pathv);
 794                 pglob->gl_pathv = NULL;
 795         }
 796 }
 797
 798 static DIR *
 799 g_opendir(str, pglob)
 800         register Char *str;
 801         glob_t *pglob;
 802 {
 803         char buf[MAXPATHLEN];
 804
 805         if (!*str)
 806                 strcpy(buf, ".");
 807         else {
 808                 if (g_Ctoc(str, buf, sizeof(buf)))
 809                         return (NULL);
 810         }
 811
 812         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 813                 return((*pglob->gl_opendir)(buf));
 814
 815         return(opendir(buf));
 816 }
 817
 818 static int
 819 g_lstat(fn, sb, pglob)
 820         register Char *fn;
 821         struct stat *sb;
 822         glob_t *pglob;
 823 {
 824         char buf[MAXPATHLEN];
 825
 826         if (g_Ctoc(fn, buf, sizeof(buf))) {
 827                 errno = ENAMETOOLONG;
 828                 return (-1);
 829         }
 830         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 831                 return((*pglob->gl_lstat)(buf, sb));
 832         return(lstat(buf, sb));
 833 }
 834
 835 static int
 836 g_stat(fn, sb, pglob)
 837         register Char *fn;
 838         struct stat *sb;
 839         glob_t *pglob;
 840 {
 841         char buf[MAXPATHLEN];
 842
 843         if (g_Ctoc(fn, buf, sizeof(buf))) {
 844                 errno = ENAMETOOLONG;
 845                 return (-1);
 846         }
 847         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 848                 return((*pglob->gl_stat)(buf, sb));
 849         return(stat(buf, sb));
 850 }
 851
 852 static Char *
 853 g_strchr(str, ch)
 854         Char *str;
 855         int ch;
 856 {
 857         do {
 858                 if (*str == ch)
 859                         return (str);
 860         } while (*str++);
 861         return (NULL);
 862 }
 863
 864 static int
 865 g_Ctoc(str, buf, len)
 866         const Char *str;
 867         char *buf;
 868         u_int len;
 869 {
 870
 871         while (len--) {
 872                 if ((*buf++ = *str++) == '\0')
 873                         return (0);
 874         }
 875         return (1);
 876 }
 877
 878 #ifdef DEBUG
 879 static void
 880 qprintf(str, s)
 881         const char *str;
 882         register Char *s;
 883 {
 884         register Char *p;
 885
 886         (void)printf("%s:\n", str);
 887         for (p = s; *p; p++)
 888                 (void)printf("%c", CHAR(*p));
 889         (void)printf("\n");
 890         for (p = s; *p; p++)
 891                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 892         (void)printf("\n");
 893         for (p = s; *p; p++)
 894                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 895         (void)printf("\n");
 896 }
 897 #endif