lib/libc/gen/glob.c

   1 /*
   2  * Copyright (c) 1989, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Guido van Rossum.
   7  *
   8  * Copyright (c) 2011 The FreeBSD Foundation
   9  * All rights reserved.
  10  * Portions of this software were developed by David Chisnall
  11  * under sponsorship from the FreeBSD Foundation.
  12  *
  13  * Redistribution and use in source and binary forms, with or without
  14  * modification, are permitted provided that the following conditions
  15  * are met:
  16  * 1. Redistributions of source code must retain the above copyright
  17  *    notice, this list of conditions and the following disclaimer.
  18  * 2. Redistributions in binary form must reproduce the above copyright
  19  *    notice, this list of conditions and the following disclaimer in the
  20  *    documentation and/or other materials provided with the distribution.
  21  * 3. Neither the name of the University nor the names of its contributors
  22  *    may be used to endorse or promote products derived from this software
  23  *    without specific prior written permission.
  24  *
  25  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  26  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  27  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  28  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  29  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  30  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  31  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  32  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  33  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  34  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  35  * SUCH DAMAGE.
  36  *
  37  * @(#)glob.c   8.3 (Berkeley) 10/13/93
  38  * $FreeBSD: head/lib/libc/gen/glob.c 249381 2013-04-11 20:15:37Z emaste $
  39  */
  40
  41 /*
  42  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  43  *
  44  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  45  *
  46  * Optional extra services, controlled by flags not defined by POSIX:
  47  *
  48  * GLOB_QUOTE:
  49  *      Escaping convention: \ inhibits any special meaning the following
  50  *      character might have (except \ at end of string is retained).
  51  * GLOB_MAGCHAR:
  52  *      Set in gl_flags if pattern contained a globbing character.
  53  * GLOB_NOMAGIC:
  54  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  55  *      not contain any magic characters.  [Used in csh style globbing]
  56  * GLOB_ALTDIRFUNC:
  57  *      Use alternately specified directory access functions.
  58  * GLOB_TILDE:
  59  *      expand ~user/foo to the /home/dir/of/user/foo
  60  * GLOB_BRACE:
  61  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  62  * gl_matchc:
  63  *      Number of matches in the current invocation of glob.
  64  */
  65
  66 /*
  67  * Some notes on multibyte character support:
  68  * 1. Patterns with illegal byte sequences match nothing - even if
  69  *    GLOB_NOCHECK is specified.
  70  * 2. Illegal byte sequences in filenames are handled by treating them as
  71  *    single-byte characters with a value of the first byte of the sequence
  72  *    cast to wchar_t.
  73  * 3. State-dependent encodings are not currently supported.
  74  */
  75
  76 #include <sys/param.h>
  77 #include <sys/stat.h>
  78
  79 #include <ctype.h>
  80 #include <dirent.h>
  81 #include <errno.h>
  82 #include <glob.h>
  83 #include <limits.h>
  84 #include <pwd.h>
  85 #include <stdint.h>
  86 #include <stdio.h>
  87 #include <stdlib.h>
  88 #include <string.h>
  89 #include <unistd.h>
  90 #include <wchar.h>
  91
  92 #include "collate.h"
  93
  94 /*
  95  * glob(3) expansion limits. Stop the expansion if any of these limits
  96  * is reached. This caps the runtime in the face of DoS attacks. See
  97  * also CVE-2010-2632
  98  */
  99 #define GLOB_LIMIT_BRACE        128     /* number of brace calls */
 100 #define GLOB_LIMIT_PATH         65536   /* number of path elements */
 101 #define GLOB_LIMIT_READDIR      16384   /* number of readdirs */
 102 #define GLOB_LIMIT_STAT         1024    /* number of stat system calls */
 103 #define GLOB_LIMIT_STRING       ARG_MAX /* maximum total size for paths */
 104
 105 struct glob_limit {
 106         size_t  l_brace_cnt;
 107         size_t  l_path_lim;
 108         size_t  l_readdir_cnt;
 109         size_t  l_stat_cnt;
 110         size_t  l_string_cnt;
 111 };
 112
 113 #define DOLLAR          '$'
 114 #define DOT             '.'
 115 #define EOS             '\0'
 116 #define LBRACKET        '['
 117 #define NOT             '!'
 118 #define QUESTION        '?'
 119 #define QUOTE           '\\'
 120 #define RANGE           '-'
 121 #define RBRACKET        ']'
 122 #define SEP             '/'
 123 #define STAR            '*'
 124 #define TILDE           '~'
 125 #define UNDERSCORE      '_'
 126 #define LBRACE          '{'
 127 #define RBRACE          '}'
 128 #define SLASH           '/'
 129 #define COMMA           ','
 130
 131 #ifndef DEBUG
 132
 133 #define M_QUOTE         0x8000000000ULL
 134 #define M_PROTECT       0x4000000000ULL
 135 #define M_MASK          0xffffffffffULL
 136 #define M_CHAR          0x00ffffffffULL
 137
 138 typedef uint_fast64_t Char;
 139
 140 #else
 141
 142 #define M_QUOTE         0x80
 143 #define M_PROTECT       0x40
 144 #define M_MASK          0xff
 145 #define M_CHAR          0x7f
 146
 147 typedef char Char;
 148
 149 #endif
 150
 151
 152 #define CHAR(c)         ((Char)((c)&M_CHAR))
 153 #define META(c)         ((Char)((c)|M_QUOTE))
 154 #define M_ALL           META('*')
 155 #define M_END           META(']')
 156 #define M_NOT           META('!')
 157 #define M_ONE           META('?')
 158 #define M_RNG           META('-')
 159 #define M_SET           META('[')
 160 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 161
 162
 163 static int       compare(const void *, const void *);
 164 static int       g_Ctoc(const Char *, char *, size_t);
 165 static int       g_lstat(Char *, struct stat *, glob_t *);
 166 static DIR      *g_opendir(Char *, glob_t *);
 167 static const Char *g_strchr(const Char *, wchar_t);
 168 #ifdef notdef
 169 static Char     *g_strcat(Char *, const Char *);
 170 #endif
 171 static int       g_stat(Char *, struct stat *, glob_t *);
 172 static int       glob0(const Char *, glob_t *, struct glob_limit *);
 173 static int       glob1(Char *, glob_t *, struct glob_limit *);
 174 static int       glob2(Char *, Char *, Char *, Char *, glob_t *,
 175     struct glob_limit *);
 176 static int       glob3(Char *, Char *, Char *, Char *, Char *, glob_t *,
 177     struct glob_limit *);
 178 static int       globextend(const Char *, glob_t *, struct glob_limit *);
 179 static const Char *
 180                  globtilde(const Char *, Char *, size_t, glob_t *);
 181 static int       globexp1(const Char *, glob_t *, struct glob_limit *);
 182 static int       globexp2(const Char *, const Char *, glob_t *, int *,
 183     struct glob_limit *);
 184 static int       match(Char *, Char *, Char *);
 185 #ifdef DEBUG
 186 static void      qprintf(const char *, Char *);
 187 #endif
 188
 189 int
 190 glob(const char * __restrict pattern, int flags,
 191          int (*errfunc)(const char *, int), glob_t * __restrict pglob)
 192 {
 193         struct glob_limit limit = { 0, 0, 0, 0, 0 };
 194         const char *patnext;
 195         Char *bufnext, *bufend, patbuf[MAXPATHLEN], prot;
 196         mbstate_t mbs;
 197         wchar_t wc;
 198         size_t clen;
 199
 200         patnext = pattern;
 201         if (!(flags & GLOB_APPEND)) {
 202                 pglob->gl_pathc = 0;
 203                 pglob->gl_pathv = NULL;
 204                 if (!(flags & GLOB_DOOFFS))
 205                         pglob->gl_offs = 0;
 206         }
 207         if (flags & GLOB_LIMIT) {
 208                 limit.l_path_lim = pglob->gl_matchc;
 209                 if (limit.l_path_lim == 0)
 210                         limit.l_path_lim = GLOB_LIMIT_PATH;
 211         }
 212         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 213         pglob->gl_errfunc = errfunc;
 214         pglob->gl_matchc = 0;
 215
 216         bufnext = patbuf;
 217         bufend = bufnext + MAXPATHLEN - 1;
 218         if (flags & GLOB_NOESCAPE) {
 219                 memset(&mbs, 0, sizeof(mbs));
 220                 while (bufend - bufnext >= MB_CUR_MAX) {
 221                         clen = mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
 222                         if (clen == (size_t)-1 || clen == (size_t)-2)
 223                                 return (GLOB_NOMATCH);
 224                         else if (clen == 0)
 225                                 break;
 226                         *bufnext++ = wc;
 227                         patnext += clen;
 228                 }
 229         } else {
 230                 /* Protect the quoted characters. */
 231                 memset(&mbs, 0, sizeof(mbs));
 232                 while (bufend - bufnext >= MB_CUR_MAX) {
 233                         if (*patnext == QUOTE) {
 234                                 if (*++patnext == EOS) {
 235                                         *bufnext++ = QUOTE | M_PROTECT;
 236                                         continue;
 237                                 }
 238                                 prot = M_PROTECT;
 239                         } else
 240                                 prot = 0;
 241                         clen = mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
 242                         if (clen == (size_t)-1 || clen == (size_t)-2)
 243                                 return (GLOB_NOMATCH);
 244                         else if (clen == 0)
 245                                 break;
 246                         *bufnext++ = wc | prot;
 247                         patnext += clen;
 248                 }
 249         }
 250         *bufnext = EOS;
 251
 252         if (flags & GLOB_BRACE)
 253             return (globexp1(patbuf, pglob, &limit));
 254         else
 255             return (glob0(patbuf, pglob, &limit));
 256 }
 257
 258 /*
 259  * Expand recursively a glob {} pattern. When there is no more expansion
 260  * invoke the standard globbing routine to glob the rest of the magic
 261  * characters
 262  */
 263 static int
 264 globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
 265 {
 266         const Char* ptr = pattern;
 267         int rv;
 268
 269         if ((pglob->gl_flags & GLOB_LIMIT) &&
 270             limit->l_brace_cnt++ >= GLOB_LIMIT_BRACE) {
 271                 errno = 0;
 272                 return (GLOB_NOSPACE);
 273         }
 274
 275         /* Protect a single {}, for find(1), like csh */
 276         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 277                 return glob0(pattern, pglob, limit);
 278
 279         while ((ptr = g_strchr(ptr, LBRACE)) != NULL)
 280                 if (!globexp2(ptr, pattern, pglob, &rv, limit))
 281                         return rv;
 282
 283         return glob0(pattern, pglob, limit);
 284 }
 285
 286
 287 /*
 288  * Recursive brace globbing helper. Tries to expand a single brace.
 289  * If it succeeds then it invokes globexp1 with the new pattern.
 290  * If it fails then it tries to glob the rest of the pattern and returns.
 291  */
 292 static int
 293 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
 294     struct glob_limit *limit)
 295 {
 296         int     i;
 297         Char   *lm, *ls;
 298         const Char *pe, *pm, *pm1, *pl;
 299         Char    patbuf[MAXPATHLEN];
 300
 301         /* copy part up to the brace */
 302         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 303                 continue;
 304         *lm = EOS;
 305         ls = lm;
 306
 307         /* Find the balanced brace */
 308         for (i = 0, pe = ++ptr; *pe; pe++)
 309                 if (*pe == LBRACKET) {
 310                         /* Ignore everything between [] */
 311                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 312                                 continue;
 313                         if (*pe == EOS) {
 314                                 /*
 315                                  * We could not find a matching RBRACKET.
 316                                  * Ignore and just look for RBRACE
 317                                  */
 318                                 pe = pm;
 319                         }
 320                 }
 321                 else if (*pe == LBRACE)
 322                         i++;
 323                 else if (*pe == RBRACE) {
 324                         if (i == 0)
 325                                 break;
 326                         i--;
 327                 }
 328
 329         /* Non matching braces; just glob the pattern */
 330         if (i != 0 || *pe == EOS) {
 331                 *rv = glob0(patbuf, pglob, limit);
 332                 return (0);
 333         }
 334
 335         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 336                 switch (*pm) {
 337                 case LBRACKET:
 338                         /* Ignore everything between [] */
 339                         for (pm1 = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 340                                 continue;
 341                         if (*pm == EOS) {
 342                                 /*
 343                                  * We could not find a matching RBRACKET.
 344                                  * Ignore and just look for RBRACE
 345                                  */
 346                                 pm = pm1;
 347                         }
 348                         break;
 349
 350                 case LBRACE:
 351                         i++;
 352                         break;
 353
 354                 case RBRACE:
 355                         if (i) {
 356                             i--;
 357                             break;
 358                         }
 359                         /* FALLTHROUGH */
 360                 case COMMA:
 361                         if (i && *pm == COMMA)
 362                                 break;
 363                         else {
 364                                 /* Append the current string */
 365                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 366                                         continue;
 367                                 /*
 368                                  * Append the rest of the pattern after the
 369                                  * closing brace
 370                                  */
 371                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 372                                         continue;
 373
 374                                 /* Expand the current pattern */
 375 #ifdef DEBUG
 376                                 qprintf("globexp2:", patbuf);
 377 #endif
 378                                 *rv = globexp1(patbuf, pglob, limit);
 379
 380                                 /* move after the comma, to the next string */
 381                                 pl = pm + 1;
 382                         }
 383                         break;
 384
 385                 default:
 386                         break;
 387                 }
 388         *rv = 0;
 389         return (0);
 390 }
 391
 392
 393
 394 /*
 395  * expand tilde from the passwd file.
 396  */
 397 static const Char *
 398 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 399 {
 400         struct passwd *pwd;
 401         char *h;
 402         const Char *p;
 403         Char *b, *eb;
 404
 405         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 406                 return (pattern);
 407
 408         /*
 409          * Copy up to the end of the string or /
 410          */
 411         eb = &patbuf[patbuf_len - 1];
 412         for (p = pattern + 1, h = (char *) patbuf;
 413             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 414                 continue;
 415
 416         *h = EOS;
 417
 418         if (((char *) patbuf)[0] == EOS) {
 419                 /*
 420                  * handle a plain ~ or ~/ by expanding $HOME first (iff
 421                  * we're not running setuid or setgid) and then trying
 422                  * the password file
 423                  */
 424                 if (issetugid() != 0 ||
 425                     (h = getenv("HOME")) == NULL) {
 426                         if (((h = getlogin()) != NULL &&
 427                              (pwd = getpwnam(h)) != NULL) ||
 428                             (pwd = getpwuid(getuid())) != NULL)
 429                                 h = pwd->pw_dir;
 430                         else
 431                                 return (pattern);
 432                 }
 433         }
 434         else {
 435                 /*
 436                  * Expand a ~user
 437                  */
 438                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 439                         return (pattern);
 440                 else
 441                         h = pwd->pw_dir;
 442         }
 443
 444         /* Copy the home directory */
 445         for (b = patbuf; b < eb && *h; *b++ = *h++)
 446                 continue;
 447
 448         /* Append the rest of the pattern */
 449         while (b < eb && (*b++ = *p++) != EOS)
 450                 continue;
 451         *b = EOS;
 452
 453         return (patbuf);
 454 }
 455
 456
 457 /*
 458  * The main glob() routine: compiles the pattern (optionally processing
 459  * quotes), calls glob1() to do the real pattern matching, and finally
 460  * sorts the list (unless unsorted operation is requested).  Returns 0
 461  * if things went well, nonzero if errors occurred.
 462  */
 463 static int
 464 glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
 465 {
 466         const Char *qpatnext;
 467         int err;
 468         size_t oldpathc;
 469         Char *bufnext, c, patbuf[MAXPATHLEN];
 470
 471         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 472         oldpathc = pglob->gl_pathc;
 473         bufnext = patbuf;
 474
 475         /* We don't need to check for buffer overflow any more. */
 476         while ((c = *qpatnext++) != EOS) {
 477                 switch (c) {
 478                 case LBRACKET:
 479                         c = *qpatnext;
 480                         if (c == NOT)
 481                                 ++qpatnext;
 482                         if (*qpatnext == EOS ||
 483                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 484                                 *bufnext++ = LBRACKET;
 485                                 if (c == NOT)
 486                                         --qpatnext;
 487                                 break;
 488                         }
 489                         *bufnext++ = M_SET;
 490                         if (c == NOT)
 491                                 *bufnext++ = M_NOT;
 492                         c = *qpatnext++;
 493                         do {
 494                                 *bufnext++ = CHAR(c);
 495                                 if (*qpatnext == RANGE &&
 496                                     (c = qpatnext[1]) != RBRACKET) {
 497                                         *bufnext++ = M_RNG;
 498                                         *bufnext++ = CHAR(c);
 499                                         qpatnext += 2;
 500                                 }
 501                         } while ((c = *qpatnext++) != RBRACKET);
 502                         pglob->gl_flags |= GLOB_MAGCHAR;
 503                         *bufnext++ = M_END;
 504                         break;
 505                 case QUESTION:
 506                         pglob->gl_flags |= GLOB_MAGCHAR;
 507                         *bufnext++ = M_ONE;
 508                         break;
 509                 case STAR:
 510                         pglob->gl_flags |= GLOB_MAGCHAR;
 511                         /* collapse adjacent stars to one,
 512                          * to avoid exponential behavior
 513                          */
 514                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 515                             *bufnext++ = M_ALL;
 516                         break;
 517                 default:
 518                         *bufnext++ = CHAR(c);
 519                         break;
 520                 }
 521         }
 522         *bufnext = EOS;
 523 #ifdef DEBUG
 524         qprintf("glob0:", patbuf);
 525 #endif
 526
 527         if ((err = glob1(patbuf, pglob, limit)) != 0)
 528                 return(err);
 529
 530         /*
 531          * If there was no match we are going to append the pattern
 532          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 533          * and the pattern did not contain any magic characters
 534          * GLOB_NOMAGIC is there just for compatibility with csh.
 535          */
 536         if (pglob->gl_pathc == oldpathc) {
 537                 if (((pglob->gl_flags & GLOB_NOCHECK) ||
 538                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 539                         !(pglob->gl_flags & GLOB_MAGCHAR))))
 540                         return (globextend(pattern, pglob, limit));
 541                 else
 542                         return (GLOB_NOMATCH);
 543         }
 544         if (!(pglob->gl_flags & GLOB_NOSORT))
 545                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 546                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 547         return (0);
 548 }
 549
 550 static int
 551 compare(const void *p, const void *q)
 552 {
 553         return (strcmp(*(char **)p, *(char **)q));
 554 }
 555
 556 static int
 557 glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
 558 {
 559         Char pathbuf[MAXPATHLEN];
 560
 561         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 562         if (*pattern == EOS)
 563                 return (0);
 564         return (glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
 565             pattern, pglob, limit));
 566 }
 567
 568 /*
 569  * The functions glob2 and glob3 are mutually recursive; there is one level
 570  * of recursion for each segment in the pattern that contains one or more
 571  * meta characters.
 572  */
 573 static int
 574 glob2(Char *pathbuf, Char *pathend, Char *pathend_last, Char *pattern,
 575       glob_t *pglob, struct glob_limit *limit)
 576 {
 577         struct stat sb;
 578         Char *p, *q;
 579         int anymeta;
 580
 581         /*
 582          * Loop over pattern segments until end of pattern or until
 583          * segment with meta character found.
 584          */
 585         for (anymeta = 0;;) {
 586                 if (*pattern == EOS) {          /* End of pattern? */
 587                         *pathend = EOS;
 588                         if (g_lstat(pathbuf, &sb, pglob))
 589                                 return (0);
 590
 591                         if ((pglob->gl_flags & GLOB_LIMIT) &&
 592                             limit->l_stat_cnt++ >= GLOB_LIMIT_STAT) {
 593                                 errno = 0;
 594                                 if (pathend + 1 > pathend_last)
 595                                         return (GLOB_ABORTED);
 596                                 *pathend++ = SEP;
 597                                 *pathend = EOS;
 598                                 return (GLOB_NOSPACE);
 599                         }
 600                         if (((pglob->gl_flags & GLOB_MARK) &&
 601                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 602                             || (S_ISLNK(sb.st_mode) &&
 603                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 604                             S_ISDIR(sb.st_mode)))) {
 605                                 if (pathend + 1 > pathend_last)
 606                                         return (GLOB_ABORTED);
 607                                 *pathend++ = SEP;
 608                                 *pathend = EOS;
 609                         }
 610                         ++pglob->gl_matchc;
 611                         return (globextend(pathbuf, pglob, limit));
 612                 }
 613
 614                 /* Find end of next segment, copy tentatively to pathend. */
 615                 q = pathend;
 616                 p = pattern;
 617                 while (*p != EOS && *p != SEP) {
 618                         if (ismeta(*p))
 619                                 anymeta = 1;
 620                         if (q + 1 > pathend_last)
 621                                 return (GLOB_ABORTED);
 622                         *q++ = *p++;
 623                 }
 624
 625                 if (!anymeta) {         /* No expansion, do next segment. */
 626                         pathend = q;
 627                         pattern = p;
 628                         while (*pattern == SEP) {
 629                                 if (pathend + 1 > pathend_last)
 630                                         return (GLOB_ABORTED);
 631                                 *pathend++ = *pattern++;
 632                         }
 633                 } else                  /* Need expansion, recurse. */
 634                         return (glob3(pathbuf, pathend, pathend_last, pattern,
 635                             p, pglob, limit));
 636         }
 637         /* NOTREACHED */
 638 }
 639
 640 static int
 641 glob3(Char *pathbuf, Char *pathend, Char *pathend_last,
 642       Char *pattern, Char *restpattern,
 643       glob_t *pglob, struct glob_limit *limit)
 644 {
 645         struct dirent *dp;
 646         DIR *dirp;
 647         int err;
 648         char buf[MAXPATHLEN];
 649
 650         struct dirent *(*readdirfunc)(DIR *);
 651
 652         if (pathend > pathend_last)
 653                 return (GLOB_ABORTED);
 654         *pathend = EOS;
 655         errno = 0;
 656
 657         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 658                 /* TODO: don't call for ENOENT or ENOTDIR? */
 659                 if (pglob->gl_errfunc) {
 660                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 661                                 return (GLOB_ABORTED);
 662                         if (pglob->gl_errfunc(buf, errno) ||
 663                             pglob->gl_flags & GLOB_ERR)
 664                                 return (GLOB_ABORTED);
 665                 }
 666                 return (0);
 667         }
 668
 669         err = 0;
 670
 671         /* pglob->gl_readdir takes a void *, fix this manually */
 672         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 673                 readdirfunc = (struct dirent *(*)(DIR *))pglob->gl_readdir;
 674         else
 675                 readdirfunc = readdir;
 676
 677         /* Search directory for matching names. */
 678         while ((dp = (*readdirfunc)(dirp)) != NULL) {
 679                 char *sc;
 680                 Char *dc;
 681                 wchar_t wc;
 682                 size_t clen;
 683                 mbstate_t mbs;
 684
 685                 if ((pglob->gl_flags & GLOB_LIMIT) &&
 686                     limit->l_readdir_cnt++ >= GLOB_LIMIT_READDIR) {
 687                         errno = 0;
 688                         if (pathend + 1 > pathend_last)
 689                                 err = GLOB_ABORTED;
 690                         else {
 691                                 *pathend++ = SEP;
 692                                 *pathend = EOS;
 693                                 err = GLOB_NOSPACE;
 694                         }
 695                         break;
 696                 }
 697
 698                 /* Initial DOT must be matched literally. */
 699                 if (dp->d_name[0] == DOT && *pattern != DOT)
 700                         continue;
 701                 memset(&mbs, 0, sizeof(mbs));
 702                 dc = pathend;
 703                 sc = dp->d_name;
 704                 while (dc < pathend_last) {
 705                         clen = mbrtowc(&wc, sc, MB_LEN_MAX, &mbs);
 706                         if (clen == (size_t)-1 || clen == (size_t)-2) {
 707                                 wc = *sc;
 708                                 clen = 1;
 709                                 memset(&mbs, 0, sizeof(mbs));
 710                         }
 711                         if ((*dc++ = wc) == EOS)
 712                                 break;
 713                         sc += clen;
 714                 }
 715                 if (!match(pathend, pattern, restpattern)) {
 716                         *pathend = EOS;
 717                         continue;
 718                 }
 719                 err = glob2(pathbuf, --dc, pathend_last, restpattern,
 720                     pglob, limit);
 721                 if (err)
 722                         break;
 723         }
 724
 725         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 726                 (*pglob->gl_closedir)(dirp);
 727         else
 728                 closedir(dirp);
 729         return (err);
 730 }
 731
 732
 733 /*
 734  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 735  * add the new item, and update gl_pathc.
 736  *
 737  * This assumes the BSD realloc, which only copies the block when its size
 738  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 739  * behavior.
 740  *
 741  * Return 0 if new item added, error code if memory couldn't be allocated.
 742  *
 743  * Invariant of the glob_t structure:
 744  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 745  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 746  */
 747 static int
 748 globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
 749 {
 750         char **pathv;
 751         size_t i, newsize, len;
 752         char *copy;
 753         const Char *p;
 754
 755         if ((pglob->gl_flags & GLOB_LIMIT) &&
 756             pglob->gl_matchc > limit->l_path_lim) {
 757                 errno = 0;
 758                 return (GLOB_NOSPACE);
 759         }
 760
 761         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 762         /* realloc(NULL, newsize) is equivalent to malloc(newsize). */
 763         pathv = realloc((void *)pglob->gl_pathv, newsize);
 764         if (pathv == NULL)
 765                 return (GLOB_NOSPACE);
 766
 767         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 768                 /* first time around -- clear initial gl_offs items */
 769                 pathv += pglob->gl_offs;
 770                 for (i = pglob->gl_offs + 1; --i > 0; )
 771                         *--pathv = NULL;
 772         }
 773         pglob->gl_pathv = pathv;
 774
 775         for (p = path; *p++;)
 776                 continue;
 777         len = MB_CUR_MAX * (size_t)(p - path);  /* XXX overallocation */
 778         limit->l_string_cnt += len;
 779         if ((pglob->gl_flags & GLOB_LIMIT) &&
 780             limit->l_string_cnt >= GLOB_LIMIT_STRING) {
 781                 errno = 0;
 782                 return (GLOB_NOSPACE);
 783         }
 784         if ((copy = malloc(len)) != NULL) {
 785                 if (g_Ctoc(path, copy, len)) {
 786                         free(copy);
 787                         return (GLOB_NOSPACE);
 788                 }
 789                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 790         }
 791         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 792         return (copy == NULL ? GLOB_NOSPACE : 0);
 793 }
 794
 795 /*
 796  * pattern matching function for filenames.  Each occurrence of the *
 797  * pattern causes a recursion level.
 798  */
 799 static int
 800 match(Char *name, Char *pat, Char *patend)
 801 {
 802         int ok, negate_range;
 803         Char c, k;
 804         struct xlocale_collate *table =
 805                 (struct xlocale_collate*)__get_locale()->components[XLC_COLLATE];
 806
 807         while (pat < patend) {
 808                 c = *pat++;
 809                 switch (c & M_MASK) {
 810                 case M_ALL:
 811                         if (pat == patend)
 812                                 return (1);
 813                         do
 814                             if (match(name, pat, patend))
 815                                     return (1);
 816                         while (*name++ != EOS);
 817                         return (0);
 818                 case M_ONE:
 819                         if (*name++ == EOS)
 820                                 return (0);
 821                         break;
 822                 case M_SET:
 823                         ok = 0;
 824                         if ((k = *name++) == EOS)
 825                                 return (0);
 826                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 827                                 ++pat;
 828                         while (((c = *pat++) & M_MASK) != M_END)
 829                                 if ((*pat & M_MASK) == M_RNG) {
 830                                         if (table->__collate_load_error ?
 831                                             CHAR(c) <= CHAR(k) && CHAR(k) <= CHAR(pat[1]) :
 832                                                __wcollate_range_cmp(CHAR(c), CHAR(k)) <= 0 &&
 833                                                __wcollate_range_cmp(CHAR(k), CHAR(pat[1])) <= 0
 834                                            )
 835                                                 ok = 1;
 836                                         pat += 2;
 837                                 } else if (c == k)
 838                                         ok = 1;
 839                         if (ok == negate_range)
 840                                 return (0);
 841                         break;
 842                 default:
 843                         if (*name++ != c)
 844                                 return (0);
 845                         break;
 846                 }
 847         }
 848         return (*name == EOS);
 849 }
 850
 851 /* Free allocated data belonging to a glob_t structure. */
 852 void
 853 globfree(glob_t *pglob)
 854 {
 855         size_t i;
 856         char **pp;
 857
 858         if (pglob->gl_pathv != NULL) {
 859                 pp = pglob->gl_pathv + pglob->gl_offs;
 860                 for (i = pglob->gl_pathc; i--; ++pp)
 861                         if (*pp)
 862                                 free(*pp);
 863                 free(pglob->gl_pathv);
 864                 pglob->gl_pathv = NULL;
 865         }
 866 }
 867
 868 static DIR *
 869 g_opendir(Char *str, glob_t *pglob)
 870 {
 871         char buf[MAXPATHLEN];
 872
 873         if (!*str)
 874                 strcpy(buf, ".");
 875         else {
 876                 if (g_Ctoc(str, buf, sizeof(buf)))
 877                         return (NULL);
 878         }
 879
 880         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 881                 return ((*pglob->gl_opendir)(buf));
 882
 883         return (opendir(buf));
 884 }
 885
 886 static int
 887 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 888 {
 889         char buf[MAXPATHLEN];
 890
 891         if (g_Ctoc(fn, buf, sizeof(buf))) {
 892                 errno = ENAMETOOLONG;
 893                 return (-1);
 894         }
 895         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 896                 return((*pglob->gl_lstat)(buf, sb));
 897         return (lstat(buf, sb));
 898 }
 899
 900 static int
 901 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 902 {
 903         char buf[MAXPATHLEN];
 904
 905         if (g_Ctoc(fn, buf, sizeof(buf))) {
 906                 errno = ENAMETOOLONG;
 907                 return (-1);
 908         }
 909         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 910                 return ((*pglob->gl_stat)(buf, sb));
 911         return (stat(buf, sb));
 912 }
 913
 914 static const Char *
 915 g_strchr(const Char *str, wchar_t ch)
 916 {
 917
 918         do {
 919                 if (*str == ch)
 920                         return (str);
 921         } while (*str++);
 922         return (NULL);
 923 }
 924
 925 static int
 926 g_Ctoc(const Char *str, char *buf, size_t len)
 927 {
 928         mbstate_t mbs;
 929         size_t clen;
 930
 931         memset(&mbs, 0, sizeof(mbs));
 932         while (len >= MB_CUR_MAX) {
 933                 clen = wcrtomb(buf, *str, &mbs);
 934                 if (clen == (size_t)-1)
 935                         return (1);
 936                 if (*str == L'\0')
 937                         return (0);
 938                 str++;
 939                 buf += clen;
 940                 len -= clen;
 941         }
 942         return (1);
 943 }
 944
 945 #ifdef DEBUG
 946 static void
 947 qprintf(const char *str, Char *s)
 948 {
 949         Char *p;
 950
 951         (void)printf("%s:\n", str);
 952         for (p = s; *p; p++)
 953                 (void)printf("%c", CHAR(*p));
 954         (void)printf("\n");
 955         for (p = s; *p; p++)
 956                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 957         (void)printf("\n");
 958         for (p = s; *p; p++)
 959                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 960         (void)printf("\n");
 961 }
 962 #endif