lib/libc/gen/glob.c

   1 /*      $NetBSD: glob.c,v 1.23 2008/05/26 13:06:38 ad Exp $     */
   2
   3 /*
   4  * Copyright (c) 1989, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Guido van Rossum.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #include <sys/cdefs.h>
  36 #if defined(LIBC_SCCS) && !defined(lint)
  37 #if 0
  38 static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
  39 #else
  40 __RCSID("$NetBSD: glob.c,v 1.23 2008/05/26 13:06:38 ad Exp $");
  41 #endif
  42 #endif /* LIBC_SCCS and not lint */
  43
  44 /*
  45  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  46  *
  47  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  48  *
  49  * Optional extra services, controlled by flags not defined by POSIX:
  50  *
  51  * GLOB_MAGCHAR:
  52  *      Set in gl_flags if pattern contained a globbing character.
  53  * GLOB_NOMAGIC:
  54  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  55  *      not contain any magic characters.  [Used in csh style globbing]
  56  * GLOB_ALTDIRFUNC:
  57  *      Use alternately specified directory access functions.
  58  * GLOB_TILDE:
  59  *      expand ~user/foo to the /home/dir/of/user/foo
  60  * GLOB_BRACE:
  61  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  62  * GLOB_PERIOD:
  63  *      allow metacharacters to match leading dots in filenames.
  64  * GLOB_NO_DOTDIRS:
  65  *      . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
  66  * gl_matchc:
  67  *      Number of matches in the current invocation of glob.
  68  */
  69
  70 #include "namespace.h"
  71 #include <sys/param.h>
  72 #include <sys/stat.h>
  73
  74 #include <assert.h>
  75 #include <ctype.h>
  76 #include <dirent.h>
  77 #include <errno.h>
  78 #include <glob.h>
  79 #include <pwd.h>
  80 #include <stdio.h>
  81 #include <stddef.h>
  82 #include <stdlib.h>
  83 #include <string.h>
  84 #include <unistd.h>
  85
  86 #ifdef HAVE_NBTOOL_CONFIG_H
  87 #define NO_GETPW_R
  88 #endif
  89
  90 #if !defined(ARG_MAX)
  91 #include <limits.h>
  92 #define ARG_MAX _POSIX_ARG_MAX
  93 #endif
  94
  95 /*
  96  * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
  97  */
  98 #ifndef _DIAGASSERT
  99 #define _DIAGASSERT(a)
 100 #endif
 101
 102 #define DOLLAR          '$'
 103 #define DOT             '.'
 104 #define EOS             '\0'
 105 #define LBRACKET        '['
 106 #define NOT             '!'
 107 #define QUESTION        '?'
 108 #define QUOTE           '\\'
 109 #define RANGE           '-'
 110 #define RBRACKET        ']'
 111 #define SEP             '/'
 112 #define STAR            '*'
 113 #define TILDE           '~'
 114 #define UNDERSCORE      '_'
 115 #define LBRACE          '{'
 116 #define RBRACE          '}'
 117 #define SLASH           '/'
 118 #define COMMA           ','
 119
 120 #ifndef USE_8BIT_CHARS
 121
 122 #define M_QUOTE         0x8000
 123 #define M_PROTECT       0x4000
 124 #define M_MASK          0xffff
 125 #define M_ASCII         0x00ff
 126
 127 typedef u_short Char;
 128
 129 #else
 130
 131 #define M_QUOTE         (Char)0x80
 132 #define M_PROTECT       (Char)0x40
 133 #define M_MASK          (Char)0xff
 134 #define M_ASCII         (Char)0x7f
 135
 136 typedef char Char;
 137
 138 #endif
 139
 140
 141 #define CHAR(c)         ((Char)((c)&M_ASCII))
 142 #define META(c)         ((Char)((c)|M_QUOTE))
 143 #define M_ALL           META('*')
 144 #define M_END           META(']')
 145 #define M_NOT           META('!')
 146 #define M_ONE           META('?')
 147 #define M_RNG           META('-')
 148 #define M_SET           META('[')
 149 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 150
 151
 152 static int       compare(const void *, const void *);
 153 static int       g_Ctoc(const Char *, char *, size_t);
 154 static int       g_lstat(Char *, __gl_stat_t  *, glob_t *);
 155 static DIR      *g_opendir(Char *, glob_t *);
 156 static Char     *g_strchr(const Char *, int);
 157 static int       g_stat(Char *, __gl_stat_t *, glob_t *);
 158 static int       glob0(const Char *, glob_t *);
 159 static int       glob1(Char *, glob_t *, size_t *);
 160 static int       glob2(Char *, Char *, Char *, Char *, glob_t *,
 161     size_t *);
 162 static int       glob3(Char *, Char *, Char *, Char *, Char *, glob_t *,
 163     size_t *);
 164 static int       globextend(const Char *, glob_t *, size_t *);
 165 static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
 166 static int       globexp1(const Char *, glob_t *);
 167 static int       globexp2(const Char *, const Char *, glob_t *, int *);
 168 static int       match(Char *, Char *, Char *);
 169 #ifdef DEBUG
 170 static void      qprintf(const char *, Char *);
 171 #endif
 172
 173 int
 174 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
 175     glob_t *pglob)
 176 {
 177         const u_char *patnext;
 178         int c;
 179         Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
 180
 181         _DIAGASSERT(pattern != NULL);
 182
 183         patnext = (const u_char *) pattern;
 184         if (!(flags & GLOB_APPEND)) {
 185                 pglob->gl_pathc = 0;
 186                 pglob->gl_pathv = NULL;
 187                 if (!(flags & GLOB_DOOFFS))
 188                         pglob->gl_offs = 0;
 189         }
 190         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 191         pglob->gl_errfunc = errfunc;
 192         pglob->gl_matchc = 0;
 193
 194         bufnext = patbuf;
 195         bufend = bufnext + MAXPATHLEN;
 196         if (flags & GLOB_NOESCAPE) {
 197                 while (bufnext < bufend && (c = *patnext++) != EOS)
 198                         *bufnext++ = c;
 199         } else {
 200                 /* Protect the quoted characters. */
 201                 while (bufnext < bufend && (c = *patnext++) != EOS)
 202                         if (c == QUOTE) {
 203                                 if ((c = *patnext++) == EOS) {
 204                                         c = QUOTE;
 205                                         --patnext;
 206                                 }
 207                                 *bufnext++ = c | M_PROTECT;
 208                         }
 209                         else
 210                                 *bufnext++ = c;
 211         }
 212         *bufnext = EOS;
 213
 214         if (flags & GLOB_BRACE)
 215             return globexp1(patbuf, pglob);
 216         else
 217             return glob0(patbuf, pglob);
 218 }
 219
 220 /*
 221  * Expand recursively a glob {} pattern. When there is no more expansion
 222  * invoke the standard globbing routine to glob the rest of the magic
 223  * characters
 224  */
 225 static int
 226 globexp1(const Char *pattern, glob_t *pglob)
 227 {
 228         const Char* ptr = pattern;
 229         int rv;
 230
 231         _DIAGASSERT(pattern != NULL);
 232         _DIAGASSERT(pglob != NULL);
 233
 234         /* Protect a single {}, for find(1), like csh */
 235         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 236                 return glob0(pattern, pglob);
 237
 238         while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
 239                 if (!globexp2(ptr, pattern, pglob, &rv))
 240                         return rv;
 241
 242         return glob0(pattern, pglob);
 243 }
 244
 245
 246 /*
 247  * Recursive brace globbing helper. Tries to expand a single brace.
 248  * If it succeeds then it invokes globexp1 with the new pattern.
 249  * If it fails then it tries to glob the rest of the pattern and returns.
 250  */
 251 static int
 252 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 253 {
 254         int     i;
 255         Char   *lm, *ls;
 256         const Char *pe, *pm, *pl;
 257         Char    patbuf[MAXPATHLEN + 1];
 258
 259         _DIAGASSERT(ptr != NULL);
 260         _DIAGASSERT(pattern != NULL);
 261         _DIAGASSERT(pglob != NULL);
 262         _DIAGASSERT(rv != NULL);
 263
 264         /* copy part up to the brace */
 265         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 266                 continue;
 267         ls = lm;
 268
 269         /* Find the balanced brace */
 270         for (i = 0, pe = ++ptr; *pe; pe++)
 271                 if (*pe == LBRACKET) {
 272                         /* Ignore everything between [] */
 273                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 274                                 continue;
 275                         if (*pe == EOS) {
 276                                 /*
 277                                  * We could not find a matching RBRACKET.
 278                                  * Ignore and just look for RBRACE
 279                                  */
 280                                 pe = pm;
 281                         }
 282                 }
 283                 else if (*pe == LBRACE)
 284                         i++;
 285                 else if (*pe == RBRACE) {
 286                         if (i == 0)
 287                                 break;
 288                         i--;
 289                 }
 290
 291         /* Non matching braces; just glob the pattern */
 292         if (i != 0 || *pe == EOS) {
 293                 /*
 294                  * we use `pattern', not `patbuf' here so that that
 295                  * unbalanced braces are passed to the match
 296                  */
 297                 *rv = glob0(pattern, pglob);
 298                 return 0;
 299         }
 300
 301         for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
 302                 switch (*pm) {
 303                 case LBRACKET:
 304                         /* Ignore everything between [] */
 305                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 306                                 continue;
 307                         if (*pm == EOS) {
 308                                 /*
 309                                  * We could not find a matching RBRACKET.
 310                                  * Ignore and just look for RBRACE
 311                                  */
 312                                 pm = pl;
 313                         }
 314                         break;
 315
 316                 case LBRACE:
 317                         i++;
 318                         break;
 319
 320                 case RBRACE:
 321                         if (i) {
 322                                 i--;
 323                                 break;
 324                         }
 325                         /* FALLTHROUGH */
 326                 case COMMA:
 327                         if (i && *pm == COMMA)
 328                                 break;
 329                         else {
 330                                 /* Append the current string */
 331                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 332                                         continue;
 333                                 /*
 334                                  * Append the rest of the pattern after the
 335                                  * closing brace
 336                                  */
 337                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 338                                         continue;
 339
 340                                 /* Expand the current pattern */
 341 #ifdef DEBUG
 342                                 qprintf("globexp2:", patbuf);
 343 #endif
 344                                 *rv = globexp1(patbuf, pglob);
 345
 346                                 /* move after the comma, to the next string */
 347                                 pl = pm + 1;
 348                         }
 349                         break;
 350
 351                 default:
 352                         break;
 353                 }
 354         }
 355         *rv = 0;
 356         return 0;
 357 }
 358
 359
 360
 361 /*
 362  * expand tilde from the passwd file.
 363  */
 364 static const Char *
 365 globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
 366 {
 367         struct passwd *pwd;
 368         const char *h;
 369         const Char *p;
 370         Char *b;
 371         char *d;
 372         Char *pend = &patbuf[patsize / sizeof(Char)];
 373 #ifndef NO_GETPW_R
 374         struct passwd pwres;
 375         char pwbuf[1024];
 376 #endif
 377
 378         pend--;
 379
 380         _DIAGASSERT(pattern != NULL);
 381         _DIAGASSERT(patbuf != NULL);
 382         _DIAGASSERT(pglob != NULL);
 383
 384         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 385                 return pattern;
 386
 387         /* Copy up to the end of the string or / */
 388         for (p = pattern + 1, d = (char *)(void *)patbuf;
 389              d < (char *)(void *)pend && *p && *p != SLASH;
 390              *d++ = *p++)
 391                 continue;
 392
 393         if (d == (char *)(void *)pend)
 394                 return NULL;
 395
 396         *d = EOS;
 397         d = (char *)(void *)patbuf;
 398
 399         if (*d == EOS) {
 400                 /*
 401                  * handle a plain ~ or ~/ by expanding $HOME
 402                  * first and then trying the password file
 403                  */
 404                 if ((h = getenv("HOME")) == NULL) {
 405 #ifdef NO_GETPW_R
 406                         if ((pwd = getpwuid(getuid())) == NULL)
 407 #else
 408                         if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
 409                             &pwd) != 0 || pwd == NULL)
 410 #endif
 411                                 return pattern;
 412                         else
 413                                 h = pwd->pw_dir;
 414                 }
 415         }
 416         else {
 417                 /*
 418                  * Expand a ~user
 419                  */
 420 #ifdef NO_GETPW_R
 421                 if ((pwd = getpwnam(d)) == NULL)
 422 #else
 423                 if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
 424                     pwd == NULL)
 425 #endif
 426                         return pattern;
 427                 else
 428                         h = pwd->pw_dir;
 429         }
 430
 431         /* Copy the home directory */
 432         for (b = patbuf; b < pend && *h; *b++ = *h++)
 433                 continue;
 434
 435         if (b == pend)
 436                 return NULL;
 437
 438         /* Append the rest of the pattern */
 439         while (b < pend && (*b++ = *p++) != EOS)
 440                 continue;
 441
 442         if (b == pend)
 443                 return NULL;
 444
 445         return patbuf;
 446 }
 447
 448
 449 /*
 450  * The main glob() routine: compiles the pattern (optionally processing
 451  * quotes), calls glob1() to do the real pattern matching, and finally
 452  * sorts the list (unless unsorted operation is requested).  Returns 0
 453  * if things went well, nonzero if errors occurred.  It is not an error
 454  * to find no matches.
 455  */
 456 static int
 457 glob0(const Char *pattern, glob_t *pglob)
 458 {
 459         const Char *qpatnext;
 460         int c, error;
 461         __gl_size_t oldpathc;
 462         Char *bufnext, patbuf[MAXPATHLEN+1];
 463         size_t limit = 0;
 464
 465         _DIAGASSERT(pattern != NULL);
 466         _DIAGASSERT(pglob != NULL);
 467
 468         if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
 469             pglob)) == NULL)
 470                 return GLOB_ABEND;
 471         oldpathc = pglob->gl_pathc;
 472         bufnext = patbuf;
 473
 474         /* We don't need to check for buffer overflow any more. */
 475         while ((c = *qpatnext++) != EOS) {
 476                 switch (c) {
 477                 case LBRACKET:
 478                         c = *qpatnext;
 479                         if (c == NOT)
 480                                 ++qpatnext;
 481                         if (*qpatnext == EOS ||
 482                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 483                                 *bufnext++ = LBRACKET;
 484                                 if (c == NOT)
 485                                         --qpatnext;
 486                                 break;
 487                         }
 488                         *bufnext++ = M_SET;
 489                         if (c == NOT)
 490                                 *bufnext++ = M_NOT;
 491                         c = *qpatnext++;
 492                         do {
 493                                 *bufnext++ = CHAR(c);
 494                                 if (*qpatnext == RANGE &&
 495                                     (c = qpatnext[1]) != RBRACKET) {
 496                                         *bufnext++ = M_RNG;
 497                                         *bufnext++ = CHAR(c);
 498                                         qpatnext += 2;
 499                                 }
 500                         } while ((c = *qpatnext++) != RBRACKET);
 501                         pglob->gl_flags |= GLOB_MAGCHAR;
 502                         *bufnext++ = M_END;
 503                         break;
 504                 case QUESTION:
 505                         pglob->gl_flags |= GLOB_MAGCHAR;
 506                         *bufnext++ = M_ONE;
 507                         break;
 508                 case STAR:
 509                         pglob->gl_flags |= GLOB_MAGCHAR;
 510                         /* collapse adjacent stars to one,
 511                          * to avoid exponential behavior
 512                          */
 513                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 514                                 *bufnext++ = M_ALL;
 515                         break;
 516                 default:
 517                         *bufnext++ = CHAR(c);
 518                         break;
 519                 }
 520         }
 521         *bufnext = EOS;
 522 #ifdef DEBUG
 523         qprintf("glob0:", patbuf);
 524 #endif
 525
 526         if ((error = glob1(patbuf, pglob, &limit)) != 0)
 527                 return error;
 528
 529         if (pglob->gl_pathc == oldpathc) {
 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
 533                  * specified and the pattern did not contain any magic
 534                  * characters GLOB_NOMAGIC is there just for compatibility
 535                  * with csh.
 536                  */
 537                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 538                     ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
 539                      == GLOB_NOMAGIC)) {
 540                         return globextend(pattern, pglob, &limit);
 541                 } else {
 542                         return GLOB_NOMATCH;
 543                 }
 544         } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
 545                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 546                     (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
 547                     compare);
 548         }
 549
 550         return 0;
 551 }
 552
 553 static int
 554 compare(const void *p, const void *q)
 555 {
 556
 557         _DIAGASSERT(p != NULL);
 558         _DIAGASSERT(q != NULL);
 559
 560         return strcoll(*(const char * const *)p, *(const char * const *)q);
 561 }
 562
 563 static int
 564 glob1(Char *pattern, glob_t *pglob, size_t *limit)
 565 {
 566         Char pathbuf[MAXPATHLEN+1];
 567
 568         _DIAGASSERT(pattern != NULL);
 569         _DIAGASSERT(pglob != NULL);
 570
 571         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 572         if (*pattern == EOS)
 573                 return 0;
 574         /*
 575          * we save one character so that we can use ptr >= limit,
 576          * in the general case when we are appending non nul chars only.
 577          */
 578         return glob2(pathbuf, pathbuf,
 579             pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
 580             pglob, limit);
 581 }
 582
 583 /*
 584  * The functions glob2 and glob3 are mutually recursive; there is one level
 585  * of recursion for each segment in the pattern that contains one or more
 586  * meta characters.
 587  */
 588 static int
 589 glob2(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern, glob_t *pglob,
 590     size_t *limit)
 591 {
 592         __gl_stat_t sb;
 593         Char *p, *q;
 594         int anymeta;
 595         Char *pend;
 596         ptrdiff_t diff;
 597
 598         _DIAGASSERT(pathbuf != NULL);
 599         _DIAGASSERT(pathend != NULL);
 600         _DIAGASSERT(pattern != NULL);
 601         _DIAGASSERT(pglob != NULL);
 602
 603         /*
 604          * Loop over pattern segments until end of pattern or until
 605          * segment with meta character found.
 606          */
 607         for (anymeta = 0;;) {
 608                 if (*pattern == EOS) {          /* End of pattern? */
 609                         *pathend = EOS;
 610                         if (g_lstat(pathbuf, &sb, pglob))
 611                                 return 0;
 612
 613                         if (((pglob->gl_flags & GLOB_MARK) &&
 614                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
 615                             (S_ISLNK(sb.st_mode) &&
 616                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 617                             S_ISDIR(sb.st_mode)))) {
 618                                 if (pathend >= pathlim)
 619                                         return GLOB_ABORTED;
 620                                 *pathend++ = SEP;
 621                                 *pathend = EOS;
 622                         }
 623                         ++pglob->gl_matchc;
 624                         return globextend(pathbuf, pglob, limit);
 625                 }
 626
 627                 /* Find end of next segment, copy tentatively to pathend. */
 628                 q = pathend;
 629                 p = pattern;
 630                 while (*p != EOS && *p != SEP) {
 631                         if (ismeta(*p))
 632                                 anymeta = 1;
 633                         if (q >= pathlim)
 634                                 return GLOB_ABORTED;
 635                         *q++ = *p++;
 636                 }
 637
 638                 /*
 639                  * No expansion, or path ends in slash-dot shash-dot-dot,
 640                  * do next segment.
 641                  */
 642                 if (pglob->gl_flags & GLOB_PERIOD) {
 643                         for (pend = pathend; pend > pathbuf && pend[-1] == '/';
 644                             pend--)
 645                                 continue;
 646                         diff = pend - pathbuf;
 647                 } else {
 648                         /* XXX: GCC */
 649                         diff = 0;
 650                         pend = pathend;
 651                 }
 652
 653                 if ((!anymeta) ||
 654                     ((pglob->gl_flags & GLOB_PERIOD) &&
 655                      (diff >= 1 && pend[-1] == DOT) &&
 656                      (diff >= 2 && (pend[-2] == SLASH || pend[-2] == DOT)) &&
 657                      (diff < 3 || pend[-3] == SLASH))) {
 658                         pathend = q;
 659                         pattern = p;
 660                         while (*pattern == SEP) {
 661                                 if (pathend >= pathlim)
 662                                         return GLOB_ABORTED;
 663                                 *pathend++ = *pattern++;
 664                         }
 665                 } else                  /* Need expansion, recurse. */
 666                         return glob3(pathbuf, pathend, pathlim, pattern, p,
 667                             pglob, limit);
 668         }
 669         /* NOTREACHED */
 670 }
 671
 672 static int
 673 glob3(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern,
 674     Char *restpattern, glob_t *pglob, size_t *limit)
 675 {
 676         struct dirent *dp;
 677         DIR *dirp;
 678         int error;
 679         char buf[MAXPATHLEN];
 680
 681         /*
 682          * The readdirfunc declaration can't be prototyped, because it is
 683          * assigned, below, to two functions which are prototyped in glob.h
 684          * and dirent.h as taking pointers to differently typed opaque
 685          * structures.
 686          */
 687         struct dirent *(*readdirfunc)(void *);
 688
 689         _DIAGASSERT(pathbuf != NULL);
 690         _DIAGASSERT(pathend != NULL);
 691         _DIAGASSERT(pattern != NULL);
 692         _DIAGASSERT(restpattern != NULL);
 693         _DIAGASSERT(pglob != NULL);
 694
 695         *pathend = EOS;
 696         errno = 0;
 697
 698         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 699                 if (pglob->gl_errfunc) {
 700                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 701                                 return GLOB_ABORTED;
 702                         if (pglob->gl_errfunc(buf, errno) ||
 703                             pglob->gl_flags & GLOB_ERR)
 704                                 return GLOB_ABORTED;
 705                 }
 706                 /*
 707                  * Posix/XOpen: glob should return when it encounters a
 708                  * directory that it cannot open or read
 709                  * XXX: Should we ignore ENOTDIR and ENOENT though?
 710                  * I think that Posix had in mind EPERM...
 711                  */
 712                 if (pglob->gl_flags & GLOB_ERR)
 713                         return GLOB_ABORTED;
 714
 715                 return 0;
 716         }
 717
 718         error = 0;
 719
 720         /* Search directory for matching names. */
 721         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 722                 readdirfunc = pglob->gl_readdir;
 723         else
 724                 readdirfunc = (struct dirent *(*)__P((void *))) readdir;
 725         while ((dp = (*readdirfunc)(dirp)) != NULL) {
 726                 u_char *sc;
 727                 Char *dc;
 728
 729                 /*
 730                  * Initial DOT must be matched literally, unless we have
 731                  * GLOB_PERIOD set.
 732                  */
 733                 if ((pglob->gl_flags & GLOB_PERIOD) == 0)
 734                         if (dp->d_name[0] == DOT && *pattern != DOT)
 735                                 continue;
 736                 /*
 737                  * If GLOB_NO_DOTDIRS is set, . and .. vanish.
 738                  */
 739                 if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
 740                     (dp->d_name[0] == DOT) &&
 741                     ((dp->d_name[1] == EOS) ||
 742                      ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
 743                         continue;
 744                 /*
 745                  * The resulting string contains EOS, so we can
 746                  * use the pathlim character, if it is the nul
 747                  */
 748                 for (sc = (u_char *) dp->d_name, dc = pathend;
 749                      dc <= pathlim && (*dc++ = *sc++) != EOS;)
 750                         continue;
 751
 752                 /*
 753                  * Have we filled the buffer without seeing EOS?
 754                  */
 755                 if (dc > pathlim && *pathlim != EOS) {
 756                         /*
 757                          * Abort when requested by caller, otherwise
 758                          * reset pathend back to last SEP and continue
 759                          * with next dir entry.
 760                          */
 761                         if (pglob->gl_flags & GLOB_ERR) {
 762                                 error = GLOB_ABORTED;
 763                                 break;
 764                         }
 765                         else {
 766                                 *pathend = EOS;
 767                                 continue;
 768                         }
 769                 }
 770
 771                 if (!match(pathend, pattern, restpattern)) {
 772                         *pathend = EOS;
 773                         continue;
 774                 }
 775                 error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit);
 776                 if (error)
 777                         break;
 778         }
 779
 780         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 781                 (*pglob->gl_closedir)(dirp);
 782         else
 783                 closedir(dirp);
 784
 785         /*
 786          * Again Posix X/Open issue with regards to error handling.
 787          */
 788         if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
 789                 return GLOB_ABORTED;
 790
 791         return error;
 792 }
 793
 794
 795 /*
 796  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 797  * add the new item, and update gl_pathc.
 798  *
 799  * This assumes the BSD realloc, which only copies the block when its size
 800  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 801  * behavior.
 802  *
 803  * Return 0 if new item added, error code if memory couldn't be allocated.
 804  *
 805  * Invariant of the glob_t structure:
 806  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 807  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 808  */
 809 static int
 810 globextend(const Char *path, glob_t *pglob, size_t *limit)
 811 {
 812         char **pathv;
 813         size_t i, newsize, len;
 814         char *copy;
 815         const Char *p;
 816
 817         _DIAGASSERT(path != NULL);
 818         _DIAGASSERT(pglob != NULL);
 819
 820         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 821         pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
 822             malloc(newsize);
 823         if (pathv == NULL)
 824                 return GLOB_NOSPACE;
 825
 826         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 827                 /* first time around -- clear initial gl_offs items */
 828                 pathv += pglob->gl_offs;
 829                 for (i = pglob->gl_offs + 1; --i > 0; )
 830                         *--pathv = NULL;
 831         }
 832         pglob->gl_pathv = pathv;
 833
 834         for (p = path; *p++;)
 835                 continue;
 836         len = (size_t)(p - path);
 837         *limit += len;
 838         if ((copy = malloc(len)) != NULL) {
 839                 if (g_Ctoc(path, copy, len)) {
 840                         free(copy);
 841                         return GLOB_ABORTED;
 842                 }
 843                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 844         }
 845         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 846
 847         if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
 848                 errno = 0;
 849                 return GLOB_NOSPACE;
 850         }
 851
 852         return copy == NULL ? GLOB_NOSPACE : 0;
 853 }
 854
 855
 856 /*
 857  * pattern matching function for filenames.  Each occurrence of the *
 858  * pattern causes a recursion level.
 859  */
 860 static int
 861 match(Char *name, Char *pat, Char *patend)
 862 {
 863         int ok, negate_range;
 864         Char c, k;
 865
 866         _DIAGASSERT(name != NULL);
 867         _DIAGASSERT(pat != NULL);
 868         _DIAGASSERT(patend != NULL);
 869
 870         while (pat < patend) {
 871                 c = *pat++;
 872                 switch (c & M_MASK) {
 873                 case M_ALL:
 874                         if (pat == patend)
 875                                 return 1;
 876                         do
 877                             if (match(name, pat, patend))
 878                                     return 1;
 879                         while (*name++ != EOS);
 880                         return 0;
 881                 case M_ONE:
 882                         if (*name++ == EOS)
 883                                 return 0;
 884                         break;
 885                 case M_SET:
 886                         ok = 0;
 887                         if ((k = *name++) == EOS)
 888                                 return 0;
 889                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 890                                 ++pat;
 891                         while (((c = *pat++) & M_MASK) != M_END)
 892                                 if ((*pat & M_MASK) == M_RNG) {
 893                                         if (c <= k && k <= pat[1])
 894                                                 ok = 1;
 895                                         pat += 2;
 896                                 } else if (c == k)
 897                                         ok = 1;
 898                         if (ok == negate_range)
 899                                 return 0;
 900                         break;
 901                 default:
 902                         if (*name++ != c)
 903                                 return 0;
 904                         break;
 905                 }
 906         }
 907         return *name == EOS;
 908 }
 909
 910 /* Free allocated data belonging to a glob_t structure. */
 911 void
 912 globfree(glob_t *pglob)
 913 {
 914         size_t i;
 915         char **pp;
 916
 917         _DIAGASSERT(pglob != NULL);
 918
 919         if (pglob->gl_pathv != NULL) {
 920                 pp = pglob->gl_pathv + pglob->gl_offs;
 921                 for (i = pglob->gl_pathc; i--; ++pp)
 922                         if (*pp)
 923                                 free(*pp);
 924                 free(pglob->gl_pathv);
 925                 pglob->gl_pathv = NULL;
 926                 pglob->gl_pathc = 0;
 927         }
 928 }
 929
 930 #ifndef __LIBC12_SOURCE__
 931 int
 932 glob_pattern_p(const char *pattern, int quote)
 933 {
 934         int range = 0;
 935
 936         for (; *pattern; pattern++)
 937                 switch (*pattern) {
 938                 case QUESTION:
 939                 case STAR:
 940                         return 1;
 941
 942                 case QUOTE:
 943                         if (quote && pattern[1] != '\0')
 944                               ++pattern;
 945                         break;
 946
 947                 case LBRACKET:
 948                         range = 1;
 949                         break;
 950
 951                 case RBRACKET:
 952                         if (range)
 953                               return 1;
 954                         break;
 955                 default:
 956                         break;
 957                 }
 958
 959           return 0;
 960 }
 961 #endif
 962
 963 static DIR *
 964 g_opendir(Char *str, glob_t *pglob)
 965 {
 966         char buf[MAXPATHLEN];
 967
 968         _DIAGASSERT(str != NULL);
 969         _DIAGASSERT(pglob != NULL);
 970
 971         if (!*str)
 972                 (void)strlcpy(buf, ".", sizeof(buf));
 973         else {
 974                 if (g_Ctoc(str, buf, sizeof(buf)))
 975                         return NULL;
 976         }
 977
 978         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 979                 return (*pglob->gl_opendir)(buf);
 980
 981         return opendir(buf);
 982 }
 983
 984 static int
 985 g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
 986 {
 987         char buf[MAXPATHLEN];
 988
 989         _DIAGASSERT(fn != NULL);
 990         _DIAGASSERT(sb != NULL);
 991         _DIAGASSERT(pglob != NULL);
 992
 993         if (g_Ctoc(fn, buf, sizeof(buf)))
 994                 return -1;
 995         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 996                 return (*pglob->gl_lstat)(buf, sb);
 997         return lstat(buf, sb);
 998 }
 999
1000 static int
1001 g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1002 {
1003         char buf[MAXPATHLEN];
1004
1005         _DIAGASSERT(fn != NULL);
1006         _DIAGASSERT(sb != NULL);
1007         _DIAGASSERT(pglob != NULL);
1008
1009         if (g_Ctoc(fn, buf, sizeof(buf)))
1010                 return -1;
1011         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1012                 return (*pglob->gl_stat)(buf, sb);
1013         return stat(buf, sb);
1014 }
1015
1016 static Char *
1017 g_strchr(const Char *str, int ch)
1018 {
1019
1020         _DIAGASSERT(str != NULL);
1021
1022         do {
1023                 if (*str == ch)
1024                         return __UNCONST(str);
1025         } while (*str++);
1026         return NULL;
1027 }
1028
1029 static int
1030 g_Ctoc(const Char *str, char *buf, size_t len)
1031 {
1032         char *dc;
1033
1034         _DIAGASSERT(str != NULL);
1035         _DIAGASSERT(buf != NULL);
1036
1037         if (len == 0)
1038                 return 1;
1039
1040         for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1041                 continue;
1042
1043         return len == 0;
1044 }
1045
1046 #ifdef DEBUG
1047 static void
1048 qprintf(const char *str, Char *s)
1049 {
1050         Char *p;
1051
1052         _DIAGASSERT(str != NULL);
1053         _DIAGASSERT(s != NULL);
1054
1055         (void)printf("%s:\n", str);
1056         for (p = s; *p; p++)
1057                 (void)printf("%c", CHAR(*p));
1058         (void)printf("\n");
1059         for (p = s; *p; p++)
1060                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1061         (void)printf("\n");
1062         for (p = s; *p; p++)
1063                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1064         (void)printf("\n");
1065 }
1066 #endif