src/system/libroot/posix/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  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 //__FBSDID("$FreeBSD: src/lib/libc/gen/glob.c,v 1.27 2008/06/26 07:12:35 mtm Exp $");
  38
  39 /*
  40  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  41  *
  42  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  43  *
  44  * Optional extra services, controlled by flags not defined by POSIX:
  45  *
  46  * GLOB_QUOTE:
  47  *      Escaping convention: \ inhibits any special meaning the following
  48  *      character might have (except \ at end of string is retained).
  49  * GLOB_MAGCHAR:
  50  *      Set in gl_flags if pattern contained a globbing character.
  51  * GLOB_NOMAGIC:
  52  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  53  *      not contain any magic characters.  [Used in csh style globbing]
  54  * GLOB_ALTDIRFUNC:
  55  *      Use alternately specified directory access functions.
  56  * GLOB_TILDE:
  57  *      expand ~user/foo to the /home/dir/of/user/foo
  58  * GLOB_BRACE:
  59  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  60  * gl_matchc:
  61  *      Number of matches in the current invocation of glob.
  62  */
  63
  64 /*
  65  * Some notes on multibyte character support:
  66  * 1. Patterns with illegal byte sequences match nothing - even if
  67  *    GLOB_NOCHECK is specified.
  68  * 2. Illegal byte sequences in filenames are handled by treating them as
  69  *    single-byte characters with a value of the first byte of the sequence
  70  *    cast to wchar_t.
  71  * 3. State-dependent encodings are not currently supported.
  72  */
  73
  74 #include <sys/param.h>
  75 #include <sys/stat.h>
  76
  77 #include <ctype.h>
  78 #include <dirent.h>
  79 #include <errno.h>
  80 #include <glob.h>
  81 #include <limits.h>
  82 #include <pwd.h>
  83 #include <stdint.h>
  84 #include <stdio.h>
  85 #include <stdlib.h>
  86 #include <string.h>
  87 #include <unistd.h>
  88
  89 #include <errno_private.h>
  90 #include <wchar_private.h>
  91
  92 #ifndef __HAIKU__
  93 #       include "collate.h"
  94 #endif
  95
  96 #define DOLLAR          '$'
  97 #define DOT             '.'
  98 #define EOS             '\0'
  99 #define LBRACKET        '['
 100 #define NOT             '!'
 101 #define QUESTION        '?'
 102 #define QUOTE           '\\'
 103 #define RANGE           '-'
 104 #define RBRACKET        ']'
 105 #define SEP             '/'
 106 #define STAR            '*'
 107 #define TILDE           '~'
 108 #define UNDERSCORE      '_'
 109 #define LBRACE          '{'
 110 #define RBRACE          '}'
 111 #define SLASH           '/'
 112 #define COMMA           ','
 113
 114 #ifndef DEBUG
 115
 116 #define M_QUOTE         0x8000000000ULL
 117 #define M_PROTECT       0x4000000000ULL
 118 #define M_MASK          0xffffffffffULL
 119 #define M_CHAR          0x00ffffffffULL
 120
 121 typedef uint_fast64_t Char;
 122
 123 #else
 124
 125 #define M_QUOTE         0x80
 126 #define M_PROTECT       0x40
 127 #define M_MASK          0xff
 128 #define M_CHAR          0x7f
 129
 130 typedef char Char;
 131
 132 #endif
 133
 134
 135 #define CHAR(c)         ((Char)((c)&M_CHAR))
 136 #define META(c)         ((Char)((c)|M_QUOTE))
 137 #define M_ALL           META('*')
 138 #define M_END           META(']')
 139 #define M_NOT           META('!')
 140 #define M_ONE           META('?')
 141 #define M_RNG           META('-')
 142 #define M_SET           META('[')
 143 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 144
 145
 146 static int       compare(const void *, const void *);
 147 static int       g_Ctoc(const Char *, char *, size_t);
 148 static int       g_lstat(Char *, struct stat *, glob_t *);
 149 static DIR      *g_opendir(Char *, glob_t *);
 150 static const Char *g_strchr(const Char *, wchar_t);
 151 #ifdef notdef
 152 static Char     *g_strcat(Char *, const Char *);
 153 #endif
 154 static int       g_stat(Char *, struct stat *, glob_t *);
 155 static int       glob0(const Char *, glob_t *, size_t *);
 156 static int       glob1(Char *, glob_t *, size_t *);
 157 static int       glob2(Char *, Char *, Char *, Char *, glob_t *, size_t *);
 158 static int       glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, size_t *);
 159 static int       globextend(const Char *, glob_t *, size_t *);
 160 static const Char *
 161                  globtilde(const Char *, Char *, size_t, glob_t *);
 162 static int       globexp1(const Char *, glob_t *, size_t *);
 163 static int       globexp2(const Char *, const Char *, glob_t *, int *, size_t *);
 164 static int       match(Char *, Char *, Char *);
 165 #ifdef DEBUG
 166 static void      qprintf(const char *, Char *);
 167 #endif
 168
 169
 170
 171 int
 172 glob(const char *pattern, int flags, int (*errfunc)(const char *, int), glob_t *pglob)
 173 {
 174         const char *patnext;
 175         size_t limit;
 176         Char *bufnext, *bufend, patbuf[MAXPATHLEN], prot;
 177         mbstate_t mbs;
 178         wchar_t wc;
 179         size_t clen;
 180
 181         patnext = pattern;
 182         if (!(flags & GLOB_APPEND)) {
 183                 pglob->gl_pathc = 0;
 184                 pglob->gl_pathv = NULL;
 185                 if (!(flags & GLOB_DOOFFS))
 186                         pglob->gl_offs = 0;
 187         }
 188         if (flags & GLOB_LIMIT) {
 189                 limit = pglob->gl_matchc;
 190                 if (limit == 0)
 191                         limit = ARG_MAX;
 192         } else
 193                 limit = 0;
 194         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 195         pglob->gl_errfunc = errfunc;
 196         pglob->gl_matchc = 0;
 197
 198         bufnext = patbuf;
 199         bufend = bufnext + MAXPATHLEN - 1;
 200         if (flags & GLOB_NOESCAPE) {
 201                 memset(&mbs, 0, sizeof(mbs));
 202                 while (bufend - bufnext >= MB_CUR_MAX) {
 203                         clen = __mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
 204                         if (clen == (size_t)-1 || clen == (size_t)-2)
 205                                 return (GLOB_NOMATCH);
 206                         else if (clen == 0)
 207                                 break;
 208                         *bufnext++ = wc;
 209                         patnext += clen;
 210                 }
 211         } else {
 212                 /* Protect the quoted characters. */
 213                 memset(&mbs, 0, sizeof(mbs));
 214                 while (bufend - bufnext >= MB_CUR_MAX) {
 215                         if (*patnext == QUOTE) {
 216                                 if (*++patnext == EOS) {
 217                                         *bufnext++ = QUOTE | M_PROTECT;
 218                                         continue;
 219                                 }
 220                                 prot = M_PROTECT;
 221                         } else
 222                                 prot = 0;
 223                         clen = __mbrtowc(&wc, patnext, MB_LEN_MAX, &mbs);
 224                         if (clen == (size_t)-1 || clen == (size_t)-2)
 225                                 return (GLOB_NOMATCH);
 226                         else if (clen == 0)
 227                                 break;
 228                         *bufnext++ = wc | prot;
 229                         patnext += clen;
 230                 }
 231         }
 232         *bufnext = EOS;
 233
 234         if (flags & GLOB_BRACE)
 235             return globexp1(patbuf, pglob, &limit);
 236         else
 237             return glob0(patbuf, pglob, &limit);
 238 }
 239
 240 /*
 241  * Expand recursively a glob {} pattern. When there is no more expansion
 242  * invoke the standard globbing routine to glob the rest of the magic
 243  * characters
 244  */
 245 static int
 246 globexp1(const Char *pattern, glob_t *pglob, size_t *limit)
 247 {
 248         const Char* ptr = pattern;
 249         int rv;
 250
 251         /* Protect a single {}, for find(1), like csh */
 252         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 253                 return glob0(pattern, pglob, limit);
 254
 255         while ((ptr = g_strchr(ptr, LBRACE)) != NULL)
 256                 if (!globexp2(ptr, pattern, pglob, &rv, limit))
 257                         return rv;
 258
 259         return glob0(pattern, pglob, limit);
 260 }
 261
 262
 263 /*
 264  * Recursive brace globbing helper. Tries to expand a single brace.
 265  * If it succeeds then it invokes globexp1 with the new pattern.
 266  * If it fails then it tries to glob the rest of the pattern and returns.
 267  */
 268 static int
 269 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv, size_t *limit)
 270 {
 271         int     i;
 272         Char   *lm, *ls;
 273         const Char *pe, *pm, *pm1, *pl;
 274         Char    patbuf[MAXPATHLEN];
 275
 276         /* copy part up to the brace */
 277         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 278                 continue;
 279         *lm = EOS;
 280         ls = lm;
 281
 282         /* Find the balanced brace */
 283         for (i = 0, pe = ++ptr; *pe; pe++)
 284                 if (*pe == LBRACKET) {
 285                         /* Ignore everything between [] */
 286                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 287                                 continue;
 288                         if (*pe == EOS) {
 289                                 /*
 290                                  * We could not find a matching RBRACKET.
 291                                  * Ignore and just look for RBRACE
 292                                  */
 293                                 pe = pm;
 294                         }
 295                 }
 296                 else if (*pe == LBRACE)
 297                         i++;
 298                 else if (*pe == RBRACE) {
 299                         if (i == 0)
 300                                 break;
 301                         i--;
 302                 }
 303
 304         /* Non matching braces; just glob the pattern */
 305         if (i != 0 || *pe == EOS) {
 306                 *rv = glob0(patbuf, pglob, limit);
 307                 return 0;
 308         }
 309
 310         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 311                 switch (*pm) {
 312                 case LBRACKET:
 313                         /* Ignore everything between [] */
 314                         for (pm1 = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 315                                 continue;
 316                         if (*pm == EOS) {
 317                                 /*
 318                                  * We could not find a matching RBRACKET.
 319                                  * Ignore and just look for RBRACE
 320                                  */
 321                                 pm = pm1;
 322                         }
 323                         break;
 324
 325                 case LBRACE:
 326                         i++;
 327                         break;
 328
 329                 case RBRACE:
 330                         if (i) {
 331                             i--;
 332                             break;
 333                         }
 334                         /* FALLTHROUGH */
 335                 case COMMA:
 336                         if (i && *pm == COMMA)
 337                                 break;
 338                         else {
 339                                 /* Append the current string */
 340                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 341                                         continue;
 342                                 /*
 343                                  * Append the rest of the pattern after the
 344                                  * closing brace
 345                                  */
 346                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 347                                         continue;
 348
 349                                 /* Expand the current pattern */
 350 #ifdef DEBUG
 351                                 qprintf("globexp2:", patbuf);
 352 #endif
 353                                 *rv = globexp1(patbuf, pglob, limit);
 354
 355                                 /* move after the comma, to the next string */
 356                                 pl = pm + 1;
 357                         }
 358                         break;
 359
 360                 default:
 361                         break;
 362                 }
 363         *rv = 0;
 364         return 0;
 365 }
 366
 367
 368
 369 /*
 370  * expand tilde from the passwd file.
 371  */
 372 static const Char *
 373 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 374 {
 375         struct passwd *pwd;
 376         char *h;
 377         const Char *p;
 378         Char *b, *eb;
 379
 380         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 381                 return pattern;
 382
 383         /*
 384          * Copy up to the end of the string or /
 385          */
 386         eb = &patbuf[patbuf_len - 1];
 387         for (p = pattern + 1, h = (char *) patbuf;
 388             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 389                 continue;
 390
 391         *h = EOS;
 392
 393         if (((char *) patbuf)[0] == EOS) {
 394                 /*
 395                  * handle a plain ~ or ~/ by expanding $HOME first (iff
 396                  * we're not running setuid or setgid) and then trying
 397                  * the password file
 398                  */
 399                 if (
 400 #ifndef __HAIKU__
 401                     issetugid() != 0 ||
 402 #endif
 403                     (h = getenv("HOME")) == NULL) {
 404                         if (((h = getlogin()) != NULL &&
 405                              (pwd = getpwnam(h)) != NULL) ||
 406                             (pwd = getpwuid(getuid())) != NULL)
 407                                 h = pwd->pw_dir;
 408                         else
 409                                 return pattern;
 410                 }
 411         }
 412         else {
 413                 /*
 414                  * Expand a ~user
 415                  */
 416                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 417                         return pattern;
 418                 else
 419                         h = pwd->pw_dir;
 420         }
 421
 422         /* Copy the home directory */
 423         for (b = patbuf; b < eb && *h; *b++ = *h++)
 424                 continue;
 425
 426         /* Append the rest of the pattern */
 427         while (b < eb && (*b++ = *p++) != EOS)
 428                 continue;
 429         *b = EOS;
 430
 431         return patbuf;
 432 }
 433
 434
 435 /*
 436  * The main glob() routine: compiles the pattern (optionally processing
 437  * quotes), calls glob1() to do the real pattern matching, and finally
 438  * sorts the list (unless unsorted operation is requested).  Returns 0
 439  * if things went well, nonzero if errors occurred.
 440  */
 441 static int
 442 glob0(const Char *pattern, glob_t *pglob, size_t *limit)
 443 {
 444         const Char *qpatnext;
 445         int c, err;
 446         size_t oldpathc;
 447         Char *bufnext, patbuf[MAXPATHLEN];
 448
 449         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 450         oldpathc = pglob->gl_pathc;
 451         bufnext = patbuf;
 452
 453         /* We don't need to check for buffer overflow any more. */
 454         while ((c = *qpatnext++) != EOS) {
 455                 switch (c) {
 456                 case LBRACKET:
 457                         c = *qpatnext;
 458                         if (c == NOT)
 459                                 ++qpatnext;
 460                         if (*qpatnext == EOS ||
 461                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 462                                 *bufnext++ = LBRACKET;
 463                                 if (c == NOT)
 464                                         --qpatnext;
 465                                 break;
 466                         }
 467                         *bufnext++ = M_SET;
 468                         if (c == NOT)
 469                                 *bufnext++ = M_NOT;
 470                         c = *qpatnext++;
 471                         do {
 472                                 *bufnext++ = CHAR(c);
 473                                 if (*qpatnext == RANGE &&
 474                                     (c = qpatnext[1]) != RBRACKET) {
 475                                         *bufnext++ = M_RNG;
 476                                         *bufnext++ = CHAR(c);
 477                                         qpatnext += 2;
 478                                 }
 479                         } while ((c = *qpatnext++) != RBRACKET);
 480                         pglob->gl_flags |= GLOB_MAGCHAR;
 481                         *bufnext++ = M_END;
 482                         break;
 483                 case QUESTION:
 484                         pglob->gl_flags |= GLOB_MAGCHAR;
 485                         *bufnext++ = M_ONE;
 486                         break;
 487                 case STAR:
 488                         pglob->gl_flags |= GLOB_MAGCHAR;
 489                         /* collapse adjacent stars to one,
 490                          * to avoid exponential behavior
 491                          */
 492                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 493                             *bufnext++ = M_ALL;
 494                         break;
 495                 default:
 496                         *bufnext++ = CHAR(c);
 497                         break;
 498                 }
 499         }
 500         *bufnext = EOS;
 501 #ifdef DEBUG
 502         qprintf("glob0:", patbuf);
 503 #endif
 504
 505         if ((err = glob1(patbuf, pglob, limit)) != 0)
 506                 return(err);
 507
 508         /*
 509          * If there was no match we are going to append the pattern
 510          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 511          * and the pattern did not contain any magic characters
 512          * GLOB_NOMAGIC is there just for compatibility with csh.
 513          */
 514         if (pglob->gl_pathc == oldpathc) {
 515                 if (((pglob->gl_flags & GLOB_NOCHECK) ||
 516                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 517                         !(pglob->gl_flags & GLOB_MAGCHAR))))
 518                         return(globextend(pattern, pglob, limit));
 519                 else
 520                         return(GLOB_NOMATCH);
 521         }
 522         if (!(pglob->gl_flags & GLOB_NOSORT))
 523                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 524                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 525         return(0);
 526 }
 527
 528 static int
 529 compare(const void *p, const void *q)
 530 {
 531         return(strcmp(*(char **)p, *(char **)q));
 532 }
 533
 534 static int
 535 glob1(Char *pattern, glob_t *pglob, size_t *limit)
 536 {
 537         Char pathbuf[MAXPATHLEN];
 538
 539         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 540         if (*pattern == EOS)
 541                 return(0);
 542         return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
 543             pattern, pglob, limit));
 544 }
 545
 546 /*
 547  * The functions glob2 and glob3 are mutually recursive; there is one level
 548  * of recursion for each segment in the pattern that contains one or more
 549  * meta characters.
 550  */
 551 static int
 552 glob2(Char *pathbuf, Char *pathend, Char *pathend_last, Char *pattern,
 553       glob_t *pglob, size_t *limit)
 554 {
 555         struct stat sb;
 556         Char *p, *q;
 557         int anymeta;
 558
 559         /*
 560          * Loop over pattern segments until end of pattern or until
 561          * segment with meta character found.
 562          */
 563         for (anymeta = 0;;) {
 564                 if (*pattern == EOS) {          /* End of pattern? */
 565                         *pathend = EOS;
 566                         if (g_lstat(pathbuf, &sb, pglob))
 567                                 return(0);
 568
 569                         if (((pglob->gl_flags & GLOB_MARK) &&
 570                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 571                             || (S_ISLNK(sb.st_mode) &&
 572                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 573                             S_ISDIR(sb.st_mode)))) {
 574                                 if (pathend + 1 > pathend_last)
 575                                         return (GLOB_ABORTED);
 576                                 *pathend++ = SEP;
 577                                 *pathend = EOS;
 578                         }
 579                         ++pglob->gl_matchc;
 580                         return(globextend(pathbuf, pglob, limit));
 581                 }
 582
 583                 /* Find end of next segment, copy tentatively to pathend. */
 584                 q = pathend;
 585                 p = pattern;
 586                 while (*p != EOS && *p != SEP) {
 587                         if (ismeta(*p))
 588                                 anymeta = 1;
 589                         if (q + 1 > pathend_last)
 590                                 return (GLOB_ABORTED);
 591                         *q++ = *p++;
 592                 }
 593
 594                 if (!anymeta) {         /* No expansion, do next segment. */
 595                         pathend = q;
 596                         pattern = p;
 597                         while (*pattern == SEP) {
 598                                 if (pathend + 1 > pathend_last)
 599                                         return (GLOB_ABORTED);
 600                                 *pathend++ = *pattern++;
 601                         }
 602                 } else                  /* Need expansion, recurse. */
 603                         return(glob3(pathbuf, pathend, pathend_last, pattern, p,
 604                             pglob, limit));
 605         }
 606         /* NOTREACHED */
 607 }
 608
 609 static int
 610 glob3(Char *pathbuf, Char *pathend, Char *pathend_last,
 611       Char *pattern, Char *restpattern,
 612       glob_t *pglob, size_t *limit)
 613 {
 614         struct dirent *dp;
 615         DIR *dirp;
 616         int err;
 617         char buf[MAXPATHLEN];
 618
 619         /*
 620          * The readdirfunc declaration can't be prototyped, because it is
 621          * assigned, below, to two functions which are prototyped in glob.h
 622          * and dirent.h as taking pointers to differently typed opaque
 623          * structures.
 624          */
 625         struct dirent *(*readdirfunc)();
 626
 627         if (pathend > pathend_last)
 628                 return (GLOB_ABORTED);
 629         *pathend = EOS;
 630         __set_errno(0);
 631
 632         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 633                 /* TODO: don't call for ENOENT or ENOTDIR? */
 634                 if (pglob->gl_errfunc) {
 635                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 636                                 return (GLOB_ABORTED);
 637                         if (pglob->gl_errfunc(buf, errno) ||
 638                             pglob->gl_flags & GLOB_ERR)
 639                                 return (GLOB_ABORTED);
 640                 }
 641                 return(0);
 642         }
 643
 644         err = 0;
 645
 646         /* Search directory for matching names. */
 647         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 648                 readdirfunc = pglob->gl_readdir;
 649         else
 650                 readdirfunc = readdir;
 651         while ((dp = (*readdirfunc)(dirp))) {
 652                 char *sc;
 653                 Char *dc;
 654                 wchar_t wc;
 655                 size_t clen;
 656                 mbstate_t mbs;
 657
 658                 /* Initial DOT must be matched literally. */
 659                 if (dp->d_name[0] == DOT && *pattern != DOT)
 660                         continue;
 661                 memset(&mbs, 0, sizeof(mbs));
 662                 dc = pathend;
 663                 sc = dp->d_name;
 664                 while (dc < pathend_last) {
 665                         clen = __mbrtowc(&wc, sc, MB_LEN_MAX, &mbs);
 666                         if (clen == (size_t)-1 || clen == (size_t)-2) {
 667                                 wc = *sc;
 668                                 clen = 1;
 669                                 memset(&mbs, 0, sizeof(mbs));
 670                         }
 671                         if ((*dc++ = wc) == EOS)
 672                                 break;
 673                         sc += clen;
 674                 }
 675                 if (!match(pathend, pattern, restpattern)) {
 676                         *pathend = EOS;
 677                         continue;
 678                 }
 679                 err = glob2(pathbuf, --dc, pathend_last, restpattern,
 680                     pglob, limit);
 681                 if (err)
 682                         break;
 683         }
 684
 685         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 686                 (*pglob->gl_closedir)(dirp);
 687         else
 688                 closedir(dirp);
 689         return(err);
 690 }
 691
 692
 693 /*
 694  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 695  * add the new item, and update gl_pathc.
 696  *
 697  * This assumes the BSD realloc, which only copies the block when its size
 698  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 699  * behavior.
 700  *
 701  * Return 0 if new item added, error code if memory couldn't be allocated.
 702  *
 703  * Invariant of the glob_t structure:
 704  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 705  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 706  */
 707 static int
 708 globextend(const Char *path, glob_t *pglob, size_t *limit)
 709 {
 710         char **pathv;
 711         size_t i, newsize, len;
 712         char *copy;
 713         const Char *p;
 714
 715         if (*limit && pglob->gl_pathc > *limit) {
 716                 __set_errno(0);
 717                 return (GLOB_NOSPACE);
 718         }
 719
 720         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 721         pathv = pglob->gl_pathv ?
 722                     realloc((char *)pglob->gl_pathv, newsize) :
 723                     malloc(newsize);
 724         if (pathv == NULL) {
 725                 if (pglob->gl_pathv) {
 726                         free(pglob->gl_pathv);
 727                         pglob->gl_pathv = NULL;
 728                 }
 729                 return(GLOB_NOSPACE);
 730         }
 731
 732         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 733                 /* first time around -- clear initial gl_offs items */
 734                 pathv += pglob->gl_offs;
 735                 for (i = pglob->gl_offs + 1; --i > 0; )
 736                         *--pathv = NULL;
 737         }
 738         pglob->gl_pathv = pathv;
 739
 740         for (p = path; *p++;)
 741                 continue;
 742         len = MB_CUR_MAX * (size_t)(p - path);  /* XXX overallocation */
 743         if ((copy = malloc(len)) != NULL) {
 744                 if (g_Ctoc(path, copy, len)) {
 745                         free(copy);
 746                         return (GLOB_NOSPACE);
 747                 }
 748                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 749         }
 750         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 751         return(copy == NULL ? GLOB_NOSPACE : 0);
 752 }
 753
 754 /*
 755  * pattern matching function for filenames.  Each occurrence of the *
 756  * pattern causes a recursion level.
 757  */
 758 static int
 759 match(Char *name, Char *pat, Char *patend)
 760 {
 761         int ok, negate_range;
 762         Char c, k;
 763
 764         while (pat < patend) {
 765                 c = *pat++;
 766                 switch (c & M_MASK) {
 767                 case M_ALL:
 768                         if (pat == patend)
 769                                 return(1);
 770                         do
 771                             if (match(name, pat, patend))
 772                                     return(1);
 773                         while (*name++ != EOS);
 774                         return(0);
 775                 case M_ONE:
 776                         if (*name++ == EOS)
 777                                 return(0);
 778                         break;
 779                 case M_SET:
 780                         ok = 0;
 781                         if ((k = *name++) == EOS)
 782                                 return(0);
 783                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 784                                 ++pat;
 785                         while (((c = *pat++) & M_MASK) != M_END)
 786                                 if ((*pat & M_MASK) == M_RNG) {
 787                                         if (
 788 #ifndef __HAIKU__
 789                                             __collate_load_error ?
 790 #endif
 791                                             CHAR(c) <= CHAR(k) && CHAR(k) <= CHAR(pat[1])
 792 #ifndef __HAIKU__
 793                                             :
 794                                                __collate_range_cmp(CHAR(c), CHAR(k)) <= 0
 795                                             && __collate_range_cmp(CHAR(k), CHAR(pat[1])) <= 0
 796 #endif
 797                                            )
 798                                                 ok = 1;
 799                                         pat += 2;
 800                                 } else if (c == k)
 801                                         ok = 1;
 802                         if (ok == negate_range)
 803                                 return(0);
 804                         break;
 805                 default:
 806                         if (*name++ != c)
 807                                 return(0);
 808                         break;
 809                 }
 810         }
 811         return(*name == EOS);
 812 }
 813
 814 /* Free allocated data belonging to a glob_t structure. */
 815 void
 816 globfree(glob_t *pglob)
 817 {
 818         size_t i;
 819         char **pp;
 820
 821         if (pglob->gl_pathv != NULL) {
 822                 pp = pglob->gl_pathv + pglob->gl_offs;
 823                 for (i = pglob->gl_pathc; i--; ++pp)
 824                         if (*pp)
 825                                 free(*pp);
 826                 free(pglob->gl_pathv);
 827                 pglob->gl_pathv = NULL;
 828         }
 829 }
 830
 831 static DIR *
 832 g_opendir(Char *str, glob_t *pglob)
 833 {
 834         char buf[MAXPATHLEN];
 835
 836         if (!*str)
 837                 strcpy(buf, ".");
 838         else {
 839                 if (g_Ctoc(str, buf, sizeof(buf)))
 840                         return (NULL);
 841         }
 842
 843         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 844                 return((*pglob->gl_opendir)(buf));
 845
 846         return(opendir(buf));
 847 }
 848
 849 static int
 850 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 851 {
 852         char buf[MAXPATHLEN];
 853
 854         if (g_Ctoc(fn, buf, sizeof(buf))) {
 855                 __set_errno(ENAMETOOLONG);
 856                 return (-1);
 857         }
 858         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 859                 return((*pglob->gl_lstat)(buf, sb));
 860         return(lstat(buf, sb));
 861 }
 862
 863 static int
 864 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 865 {
 866         char buf[MAXPATHLEN];
 867
 868         if (g_Ctoc(fn, buf, sizeof(buf))) {
 869                 __set_errno(ENAMETOOLONG);
 870                 return (-1);
 871         }
 872         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 873                 return((*pglob->gl_stat)(buf, sb));
 874         return(stat(buf, sb));
 875 }
 876
 877 static const Char *
 878 g_strchr(const Char *str, wchar_t ch)
 879 {
 880
 881         do {
 882                 if (*str == ch)
 883                         return (str);
 884         } while (*str++);
 885         return (NULL);
 886 }
 887
 888 static int
 889 g_Ctoc(const Char *str, char *buf, size_t len)
 890 {
 891         mbstate_t mbs;
 892         size_t clen;
 893
 894         memset(&mbs, 0, sizeof(mbs));
 895         while (len >= MB_CUR_MAX) {
 896                 clen = __wcrtomb(buf, *str, &mbs);
 897                 if (clen == (size_t)-1)
 898                         return (1);
 899                 if (*str == L'\0')
 900                         return (0);
 901                 str++;
 902                 buf += clen;
 903                 len -= clen;
 904         }
 905         return (1);
 906 }
 907
 908 #ifdef DEBUG
 909 static void
 910 qprintf(const char *str, Char *s)
 911 {
 912         Char *p;
 913
 914         (void)printf("%s:\n", str);
 915         for (p = s; *p; p++)
 916                 (void)printf("%c", CHAR(*p));
 917         (void)printf("\n");
 918         for (p = s; *p; p++)
 919                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 920         (void)printf("\n");
 921         for (p = s; *p; p++)
 922                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 923         (void)printf("\n");
 924 }
 925 #endif