config/glob.c

   1 /*      $OpenBSD: glob.c,v 1.25 2005/08/08 08:05:34 espie Exp $ */
   2 /*
   3  * Copyright (c) 1989, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Guido van Rossum.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /*
  35  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  36  *
  37  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  38  *
  39  * Optional extra services, controlled by flags not defined by POSIX:
  40  *
  41  * GLOB_QUOTE:
  42  *      Escaping convention: \ inhibits any special meaning the following
  43  *      character might have (except \ at end of string is retained).
  44  * GLOB_MAGCHAR:
  45  *      Set in gl_flags if pattern contained a globbing character.
  46  * GLOB_NOMAGIC:
  47  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  48  *      not contain any magic characters.  [Used in csh style globbing]
  49  * GLOB_ALTDIRFUNC:
  50  *      Use alternately specified directory access functions.
  51  * GLOB_TILDE:
  52  *      expand ~user/foo to the /home/dir/of/user/foo
  53  * GLOB_BRACE:
  54  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  55  * gl_matchc:
  56  *      Number of matches in the current invocation of glob.
  57  */
  58
  59 #ifdef __APPLE__
  60 #include <sys/param.h>
  61 #include <sys/stat.h>
  62
  63 #include <ctype.h>
  64 #include <dirent.h>
  65 #include <errno.h>
  66 #include <glob.h>
  67 #include <pwd.h>
  68 #include <stdio.h>
  69 #include <stdlib.h>
  70 #include <string.h>
  71 #include <unistd.h>
  72
  73 #define DOLLAR          '$'
  74 #define DOT             '.'
  75 #define EOS             '\0'
  76 #define LBRACKET        '['
  77 #define NOT             '!'
  78 #define QUESTION        '?'
  79 #define QUOTE           '\\'
  80 #define RANGE           '-'
  81 #define RBRACKET        ']'
  82 #define SEP             '/'
  83 #define STAR            '*'
  84 #define TILDE           '~'
  85 #define UNDERSCORE      '_'
  86 #define LBRACE          '{'
  87 #define RBRACE          '}'
  88 #define SLASH           '/'
  89 #define COMMA           ','
  90
  91 #ifndef DEBUG
  92
  93 #define M_QUOTE         0x8000
  94 #define M_PROTECT       0x4000
  95 #define M_MASK          0xffff
  96 #define M_ASCII         0x00ff
  97
  98 typedef u_short Char;
  99
 100 #else
 101
 102 #define M_QUOTE         0x80
 103 #define M_PROTECT       0x40
 104 #define M_MASK          0xff
 105 #define M_ASCII         0x7f
 106
 107 typedef char Char;
 108
 109 #endif
 110
 111
 112 #define CHAR(c)         ((Char)((c)&M_ASCII))
 113 #define META(c)         ((Char)((c)|M_QUOTE))
 114 #define M_ALL           META('*')
 115 #define M_END           META(']')
 116 #define M_NOT           META('!')
 117 #define M_ONE           META('?')
 118 #define M_RNG           META('-')
 119 #define M_SET           META('[')
 120 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 121
 122
 123 static int       compare(const void *, const void *);
 124 static int       g_Ctoc(const Char *, char *, u_int);
 125 static int       g_lstat(Char *, struct stat *, glob_t *);
 126 static DIR      *g_opendir(Char *, glob_t *);
 127 static const Char *g_strchr(const Char *, int);
 128 static int       g_stat(Char *, struct stat *, glob_t *);
 129 static int       glob0(const Char *, glob_t *);
 130 static int       glob1(Char *, Char *, glob_t *, size_t *);
 131 static int       glob2(Char *, Char *, Char *, Char *, Char *, Char *,
 132                     glob_t *, size_t *);
 133 static int       glob3(Char *, Char *, Char *, Char *, Char *, Char *,
 134                     Char *, Char *, glob_t *, size_t *);
 135 static int       globextend(const Char *, glob_t *, size_t *);
 136 static const Char *
 137                  globtilde(const Char *, Char *, size_t, glob_t *);
 138 static int       globexp1(const Char *, glob_t *);
 139 static int       globexp2(const Char *, const Char *, glob_t *, int *);
 140 static int       match(Char *, Char *, Char *);
 141 #ifdef DEBUG
 142 static void      qprintf(const char *, Char *);
 143 #endif
 144
 145 int
 146 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
 147     glob_t *pglob)
 148 {
 149         const u_char *patnext;
 150         int c;
 151         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 152
 153         patnext = (const u_char *) pattern;
 154         if (!(flags & GLOB_APPEND)) {
 155                 pglob->gl_pathc = 0;
 156                 pglob->gl_pathv = NULL;
 157                 if (!(flags & GLOB_DOOFFS))
 158                         pglob->gl_offs = 0;
 159         }
 160         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 161         pglob->gl_errfunc = errfunc;
 162         pglob->gl_matchc = 0;
 163
 164         bufnext = patbuf;
 165         bufend = bufnext + MAXPATHLEN - 1;
 166         if (flags & GLOB_NOESCAPE)
 167                 while (bufnext < bufend && (c = *patnext++) != EOS)
 168                         *bufnext++ = c;
 169         else {
 170                 /* Protect the quoted characters. */
 171                 while (bufnext < bufend && (c = *patnext++) != EOS)
 172                         if (c == QUOTE) {
 173                                 if ((c = *patnext++) == EOS) {
 174                                         c = QUOTE;
 175                                         --patnext;
 176                                 }
 177                                 *bufnext++ = c | M_PROTECT;
 178                         } else
 179                                 *bufnext++ = c;
 180         }
 181         *bufnext = EOS;
 182
 183         if (flags & GLOB_BRACE)
 184                 return globexp1(patbuf, pglob);
 185         else
 186                 return glob0(patbuf, pglob);
 187 }
 188
 189 /*
 190  * Expand recursively a glob {} pattern. When there is no more expansion
 191  * invoke the standard globbing routine to glob the rest of the magic
 192  * characters
 193  */
 194 static int
 195 globexp1(const Char *pattern, glob_t *pglob)
 196 {
 197         const Char* ptr = pattern;
 198         int rv;
 199
 200         /* Protect a single {}, for find(1), like csh */
 201         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 202                 return glob0(pattern, pglob);
 203
 204         while ((ptr = g_strchr(ptr, LBRACE)) != NULL)
 205                 if (!globexp2(ptr, pattern, pglob, &rv))
 206                         return rv;
 207
 208         return glob0(pattern, pglob);
 209 }
 210
 211
 212 /*
 213  * Recursive brace globbing helper. Tries to expand a single brace.
 214  * If it succeeds then it invokes globexp1 with the new pattern.
 215  * If it fails then it tries to glob the rest of the pattern and returns.
 216  */
 217 static int
 218 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 219 {
 220         int     i;
 221         Char   *lm, *ls;
 222         const Char *pe, *pm, *pl;
 223         Char    patbuf[MAXPATHLEN];
 224
 225         /* copy part up to the brace */
 226         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 227                 ;
 228         *lm = EOS;
 229         ls = lm;
 230
 231         /* Find the balanced brace */
 232         for (i = 0, pe = ++ptr; *pe; pe++)
 233                 if (*pe == LBRACKET) {
 234                         /* Ignore everything between [] */
 235                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 236                                 ;
 237                         if (*pe == EOS) {
 238                                 /*
 239                                  * We could not find a matching RBRACKET.
 240                                  * Ignore and just look for RBRACE
 241                                  */
 242                                 pe = pm;
 243                         }
 244                 } else if (*pe == LBRACE)
 245                         i++;
 246                 else if (*pe == RBRACE) {
 247                         if (i == 0)
 248                                 break;
 249                         i--;
 250                 }
 251
 252         /* Non matching braces; just glob the pattern */
 253         if (i != 0 || *pe == EOS) {
 254                 *rv = glob0(patbuf, pglob);
 255                 return 0;
 256         }
 257
 258         for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
 259                 switch (*pm) {
 260                 case LBRACKET:
 261                         /* Ignore everything between [] */
 262                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 263                                 ;
 264                         if (*pm == EOS) {
 265                                 /*
 266                                  * We could not find a matching RBRACKET.
 267                                  * Ignore and just look for RBRACE
 268                                  */
 269                                 pm = pl;
 270                         }
 271                         break;
 272
 273                 case LBRACE:
 274                         i++;
 275                         break;
 276
 277                 case RBRACE:
 278                         if (i) {
 279                                 i--;
 280                                 break;
 281                         }
 282                         /* FALLTHROUGH */
 283                 case COMMA:
 284                         if (i && *pm == COMMA)
 285                                 break;
 286                         else {
 287                                 /* Append the current string */
 288                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 289                                         ;
 290
 291                                 /*
 292                                  * Append the rest of the pattern after the
 293                                  * closing brace
 294                                  */
 295                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
 296                                         ;
 297
 298                                 /* Expand the current pattern */
 299 #ifdef DEBUG
 300                                 qprintf("globexp2:", patbuf);
 301 #endif
 302                                 *rv = globexp1(patbuf, pglob);
 303
 304                                 /* move after the comma, to the next string */
 305                                 pl = pm + 1;
 306                         }
 307                         break;
 308
 309                 default:
 310                         break;
 311                 }
 312         }
 313         *rv = 0;
 314         return 0;
 315 }
 316
 317
 318
 319 /*
 320  * expand tilde from the passwd file.
 321  */
 322 static const Char *
 323 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 324 {
 325         struct passwd *pwd;
 326         char *h;
 327         const Char *p;
 328         Char *b, *eb;
 329
 330         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 331                 return pattern;
 332
 333         /* Copy up to the end of the string or / */
 334         eb = &patbuf[patbuf_len - 1];
 335         for (p = pattern + 1, h = (char *) patbuf;
 336             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 337                 ;
 338
 339         *h = EOS;
 340
 341 #if 0
 342         if (h == (char *)eb)
 343                 return what;
 344 #endif
 345
 346         if (((char *) patbuf)[0] == EOS) {
 347                 /*
 348                  * handle a plain ~ or ~/ by expanding $HOME
 349                  * first and then trying the password file
 350                  */
 351                 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
 352                         if ((pwd = getpwuid(getuid())) == NULL)
 353                                 return pattern;
 354                         else
 355                                 h = pwd->pw_dir;
 356                 }
 357         } else {
 358                 /*
 359                  * Expand a ~user
 360                  */
 361                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 362                         return pattern;
 363                 else
 364                         h = pwd->pw_dir;
 365         }
 366
 367         /* Copy the home directory */
 368         for (b = patbuf; b < eb && *h; *b++ = *h++)
 369                 ;
 370
 371         /* Append the rest of the pattern */
 372         while (b < eb && (*b++ = *p++) != EOS)
 373                 ;
 374         *b = EOS;
 375
 376         return patbuf;
 377 }
 378
 379
 380 /*
 381  * The main glob() routine: compiles the pattern (optionally processing
 382  * quotes), calls glob1() to do the real pattern matching, and finally
 383  * sorts the list (unless unsorted operation is requested).  Returns 0
 384  * if things went well, nonzero if errors occurred.  It is not an error
 385  * to find no matches.
 386  */
 387 static int
 388 glob0(const Char *pattern, glob_t *pglob)
 389 {
 390         const Char *qpatnext;
 391         int c, err, oldpathc;
 392         Char *bufnext, patbuf[MAXPATHLEN];
 393         size_t limit = 0;
 394
 395         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 396         oldpathc = pglob->gl_pathc;
 397         bufnext = patbuf;
 398
 399         /* We don't need to check for buffer overflow any more. */
 400         while ((c = *qpatnext++) != EOS) {
 401                 switch (c) {
 402                 case LBRACKET:
 403                         c = *qpatnext;
 404                         if (c == NOT)
 405                                 ++qpatnext;
 406                         if (*qpatnext == EOS ||
 407                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 408                                 *bufnext++ = LBRACKET;
 409                                 if (c == NOT)
 410                                         --qpatnext;
 411                                 break;
 412                         }
 413                         *bufnext++ = M_SET;
 414                         if (c == NOT)
 415                                 *bufnext++ = M_NOT;
 416                         c = *qpatnext++;
 417                         do {
 418                                 *bufnext++ = CHAR(c);
 419                                 if (*qpatnext == RANGE &&
 420                                     (c = qpatnext[1]) != RBRACKET) {
 421                                         *bufnext++ = M_RNG;
 422                                         *bufnext++ = CHAR(c);
 423                                         qpatnext += 2;
 424                                 }
 425                         } while ((c = *qpatnext++) != RBRACKET);
 426                         pglob->gl_flags |= GLOB_MAGCHAR;
 427                         *bufnext++ = M_END;
 428                         break;
 429                 case QUESTION:
 430                         pglob->gl_flags |= GLOB_MAGCHAR;
 431                         *bufnext++ = M_ONE;
 432                         break;
 433                 case STAR:
 434                         pglob->gl_flags |= GLOB_MAGCHAR;
 435                         /* collapse adjacent stars to one,
 436                          * to avoid exponential behavior
 437                          */
 438                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 439                                 *bufnext++ = M_ALL;
 440                         break;
 441                 default:
 442                         *bufnext++ = CHAR(c);
 443                         break;
 444                 }
 445         }
 446         *bufnext = EOS;
 447 #ifdef DEBUG
 448         qprintf("glob0:", patbuf);
 449 #endif
 450
 451         if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, &limit)) != 0)
 452                 return(err);
 453
 454         /*
 455          * If there was no match we are going to append the pattern
 456          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 457          * and the pattern did not contain any magic characters
 458          * GLOB_NOMAGIC is there just for compatibility with csh.
 459          */
 460         if (pglob->gl_pathc == oldpathc) {
 461                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 462                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 463                     !(pglob->gl_flags & GLOB_MAGCHAR)))
 464                         return(globextend(pattern, pglob, &limit));
 465                 else
 466                         return(GLOB_NOMATCH);
 467         }
 468         if (!(pglob->gl_flags & GLOB_NOSORT))
 469                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 470                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 471         return(0);
 472 }
 473
 474 static int
 475 compare(const void *p, const void *q)
 476 {
 477         return(strcmp(*(char *const *)p, *(char *const *)q));
 478 }
 479
 480 static int
 481 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 482 {
 483         Char pathbuf[MAXPATHLEN];
 484
 485         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 486         if (*pattern == EOS)
 487                 return(0);
 488         return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
 489             pathbuf, pathbuf+MAXPATHLEN-1,
 490             pattern, pattern_last, pglob, limitp));
 491 }
 492
 493 /*
 494  * The functions glob2 and glob3 are mutually recursive; there is one level
 495  * of recursion for each segment in the pattern that contains one or more
 496  * meta characters.
 497  */
 498 static int
 499 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 500     Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 501 {
 502         struct stat sb;
 503         Char *p, *q;
 504         int anymeta;
 505
 506         /*
 507          * Loop over pattern segments until end of pattern or until
 508          * segment with meta character found.
 509          */
 510         for (anymeta = 0;;) {
 511                 if (*pattern == EOS) {          /* End of pattern? */
 512                         *pathend = EOS;
 513                         if (g_lstat(pathbuf, &sb, pglob))
 514                                 return(0);
 515
 516                         if (((pglob->gl_flags & GLOB_MARK) &&
 517                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
 518                             (S_ISLNK(sb.st_mode) &&
 519                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 520                             S_ISDIR(sb.st_mode)))) {
 521                                 if (pathend+1 > pathend_last)
 522                                         return (1);
 523                                 *pathend++ = SEP;
 524                                 *pathend = EOS;
 525                         }
 526                         ++pglob->gl_matchc;
 527                         return(globextend(pathbuf, pglob, limitp));
 528                 }
 529
 530                 /* Find end of next segment, copy tentatively to pathend. */
 531                 q = pathend;
 532                 p = pattern;
 533                 while (*p != EOS && *p != SEP) {
 534                         if (ismeta(*p))
 535                                 anymeta = 1;
 536                         if (q+1 > pathend_last)
 537                                 return (1);
 538                         *q++ = *p++;
 539                 }
 540
 541                 if (!anymeta) {         /* No expansion, do next segment. */
 542                         pathend = q;
 543                         pattern = p;
 544                         while (*pattern == SEP) {
 545                                 if (pathend+1 > pathend_last)
 546                                         return (1);
 547                                 *pathend++ = *pattern++;
 548                         }
 549                 } else
 550                         /* Need expansion, recurse. */
 551                         return(glob3(pathbuf, pathbuf_last, pathend,
 552                             pathend_last, pattern, pattern_last,
 553                             p, pattern_last, pglob, limitp));
 554         }
 555         /* NOTREACHED */
 556 }
 557
 558 static int
 559 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 560     Char *pattern, Char *pattern_last __attribute__((unused)), Char *restpattern,
 561     Char *restpattern_last, glob_t *pglob, size_t *limitp)
 562 {
 563         struct dirent *dp;
 564         DIR *dirp;
 565         int err;
 566         char buf[MAXPATHLEN];
 567
 568         /*
 569          * The readdirfunc declaration can't be prototyped, because it is
 570          * assigned, below, to two functions which are prototyped in glob.h
 571          * and dirent.h as taking pointers to differently typed opaque
 572          * structures.
 573          */
 574         struct dirent *(*readdirfunc)(void *);
 575
 576         if (pathend > pathend_last)
 577                 return (1);
 578         *pathend = EOS;
 579         errno = 0;
 580
 581         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 582                 /* TODO: don't call for ENOENT or ENOTDIR? */
 583                 if (pglob->gl_errfunc) {
 584                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 585                                 return(GLOB_ABORTED);
 586                         if (pglob->gl_errfunc(buf, errno) ||
 587                             pglob->gl_flags & GLOB_ERR)
 588                                 return(GLOB_ABORTED);
 589                 }
 590                 return(0);
 591         }
 592
 593         err = 0;
 594
 595         /* Search directory for matching names. */
 596         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 597                 readdirfunc = pglob->gl_readdir;
 598         else
 599                 readdirfunc = (struct dirent *(*)(void *))readdir;
 600         while ((dp = (*readdirfunc)(dirp))) {
 601                 u_char *sc;
 602                 Char *dc;
 603
 604                 /* Initial DOT must be matched literally. */
 605                 if (dp->d_name[0] == DOT && *pattern != DOT)
 606                         continue;
 607                 dc = pathend;
 608                 sc = (u_char *) dp->d_name;
 609                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 610                         ;
 611                 if (dc >= pathend_last) {
 612                         *dc = EOS;
 613                         err = 1;
 614                         break;
 615                 }
 616
 617                 if (!match(pathend, pattern, restpattern)) {
 618                         *pathend = EOS;
 619                         continue;
 620                 }
 621                 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
 622                     restpattern, restpattern_last, pglob, limitp);
 623                 if (err)
 624                         break;
 625         }
 626
 627         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 628                 (*pglob->gl_closedir)(dirp);
 629         else
 630                 closedir(dirp);
 631         return(err);
 632 }
 633
 634
 635 /*
 636  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 637  * add the new item, and update gl_pathc.
 638  *
 639  * This assumes the BSD realloc, which only copies the block when its size
 640  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 641  * behavior.
 642  *
 643  * Return 0 if new item added, error code if memory couldn't be allocated.
 644  *
 645  * Invariant of the glob_t structure:
 646  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 647  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 648  */
 649 static int
 650 globextend(const Char *path, glob_t *pglob, size_t *limitp)
 651 {
 652         char **pathv;
 653         int i;
 654         u_int newsize, len;
 655         char *copy;
 656         const Char *p;
 657
 658         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 659         pathv = pglob->gl_pathv ? realloc((char *)pglob->gl_pathv, newsize) :
 660             malloc(newsize);
 661         if (pathv == NULL) {
 662                 if (pglob->gl_pathv) {
 663                         free(pglob->gl_pathv);
 664                         pglob->gl_pathv = NULL;
 665                 }
 666                 return(GLOB_NOSPACE);
 667         }
 668
 669         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 670                 /* first time around -- clear initial gl_offs items */
 671                 pathv += pglob->gl_offs;
 672                 for (i = pglob->gl_offs; --i >= 0; )
 673                         *--pathv = NULL;
 674         }
 675         pglob->gl_pathv = pathv;
 676
 677         for (p = path; *p++;)
 678                 ;
 679         len = (size_t)(p - path);
 680         *limitp += len;
 681         if ((copy = malloc(len)) != NULL) {
 682                 if (g_Ctoc(path, copy, len)) {
 683                         free(copy);
 684                         return(GLOB_NOSPACE);
 685                 }
 686                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 687         }
 688         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 689
 690         if ((pglob->gl_flags & GLOB_LIMIT) &&
 691             newsize + *limitp >= ARG_MAX) {
 692                 errno = 0;
 693                 return(GLOB_NOSPACE);
 694         }
 695
 696         return(copy == NULL ? GLOB_NOSPACE : 0);
 697 }
 698
 699
 700 /*
 701  * pattern matching function for filenames.  Each occurrence of the *
 702  * pattern causes a recursion level.
 703  */
 704 static int
 705 match(Char *name, Char *pat, Char *patend)
 706 {
 707         int ok, negate_range;
 708         Char c, k;
 709
 710         while (pat < patend) {
 711                 c = *pat++;
 712                 switch (c & M_MASK) {
 713                 case M_ALL:
 714                         if (pat == patend)
 715                                 return(1);
 716                         do {
 717                             if (match(name, pat, patend))
 718                                     return(1);
 719                         } while (*name++ != EOS);
 720                         return(0);
 721                 case M_ONE:
 722                         if (*name++ == EOS)
 723                                 return(0);
 724                         break;
 725                 case M_SET:
 726                         ok = 0;
 727                         if ((k = *name++) == EOS)
 728                                 return(0);
 729                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 730                                 ++pat;
 731                         while (((c = *pat++) & M_MASK) != M_END)
 732                                 if ((*pat & M_MASK) == M_RNG) {
 733                                         if (c <= k && k <= pat[1])
 734                                                 ok = 1;
 735                                         pat += 2;
 736                                 } else if (c == k)
 737                                         ok = 1;
 738                         if (ok == negate_range)
 739                                 return(0);
 740                         break;
 741                 default:
 742                         if (*name++ != c)
 743                                 return(0);
 744                         break;
 745                 }
 746         }
 747         return(*name == EOS);
 748 }
 749
 750 /* Free allocated data belonging to a glob_t structure. */
 751 void
 752 globfree(glob_t *pglob)
 753 {
 754         int i;
 755         char **pp;
 756
 757         if (pglob->gl_pathv != NULL) {
 758                 pp = pglob->gl_pathv + pglob->gl_offs;
 759                 for (i = pglob->gl_pathc; i--; ++pp)
 760                         if (*pp)
 761                                 free(*pp);
 762                 free(pglob->gl_pathv);
 763                 pglob->gl_pathv = NULL;
 764         }
 765 }
 766
 767 static DIR *
 768 g_opendir(Char *str, glob_t *pglob)
 769 {
 770         char buf[MAXPATHLEN];
 771
 772         if (!*str)
 773                 strlcpy(buf, ".", sizeof buf);
 774         else {
 775                 if (g_Ctoc(str, buf, sizeof(buf)))
 776                         return(NULL);
 777         }
 778
 779         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 780                 return((*pglob->gl_opendir)(buf));
 781
 782         return(opendir(buf));
 783 }
 784
 785 static int
 786 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 787 {
 788         char buf[MAXPATHLEN];
 789
 790         if (g_Ctoc(fn, buf, sizeof(buf)))
 791                 return(-1);
 792         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 793                 return((*pglob->gl_lstat)(buf, sb));
 794         return(lstat(buf, sb));
 795 }
 796
 797 static int
 798 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 799 {
 800         char buf[MAXPATHLEN];
 801
 802         if (g_Ctoc(fn, buf, sizeof(buf)))
 803                 return(-1);
 804         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 805                 return((*pglob->gl_stat)(buf, sb));
 806         return(stat(buf, sb));
 807 }
 808
 809 static const Char *
 810 g_strchr(const Char *str, int ch)
 811 {
 812         do {
 813                 if (*str == ch)
 814                         return (str);
 815         } while (*str++);
 816         return (NULL);
 817 }
 818
 819 static int
 820 g_Ctoc(const Char *str, char *buf, u_int len)
 821 {
 822
 823         while (len--) {
 824                 if ((*buf++ = *str++) == EOS)
 825                         return (0);
 826         }
 827         return (1);
 828 }
 829
 830 #ifdef DEBUG
 831 static void
 832 qprintf(const char *str, Char *s)
 833 {
 834         Char *p;
 835
 836         (void)printf("%s:\n", str);
 837         for (p = s; *p; p++)
 838                 (void)printf("%c", CHAR(*p));
 839         (void)printf("\n");
 840         for (p = s; *p; p++)
 841                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 842         (void)printf("\n");
 843         for (p = s; *p; p++)
 844                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 845         (void)printf("\n");
 846 }
 847 #endif
 848 #endif