newlib/libc/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 #ifdef __CYGWIN__
  34 #define _NO_GLOB        /* Cygwin provides its own glob. */
  35 #endif
  36
  37 #ifndef _NO_GLOB
  38
  39 #if defined(LIBC_SCCS) && !defined(lint)
  40 static char sccsid[] = "@(#)glob.c      8.3 (Berkeley) 10/13/93";
  41 #endif /* LIBC_SCCS and not lint */
  42 #include <sys/cdefs.h>
  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_QUOTE:
  52  *      Escaping convention: \ inhibits any special meaning the following
  53  *      character might have (except \ at end of string is retained).
  54  * GLOB_MAGCHAR:
  55  *      Set in gl_flags if pattern contained a globbing character.
  56  * GLOB_NOMAGIC:
  57  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  58  *      not contain any magic characters.  [Used in csh style globbing]
  59  * GLOB_ALTDIRFUNC:
  60  *      Use alternately specified directory access functions.
  61  * GLOB_TILDE:
  62  *      expand ~user/foo to the /home/dir/of/user/foo
  63  * GLOB_BRACE:
  64  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  65  * gl_matchc:
  66  *      Number of matches in the current invocation of glob.
  67  */
  68
  69 #include <sys/param.h>
  70 #include <sys/types.h>
  71 #include <sys/stat.h>
  72
  73 #include <ctype.h>
  74 #include <dirent.h>
  75 #include <errno.h>
  76 #include <glob.h>
  77 #include <pwd.h>
  78 #include <stdio.h>
  79 #include <stdlib.h>
  80 #include <string.h>
  81 #include <unistd.h>
  82 #include <limits.h>
  83
  84 #include "collate.h"
  85
  86 #define DOLLAR          '$'
  87 #define DOT             '.'
  88 #define EOS             '\0'
  89 #define LBRACKET        '['
  90 #define NOT             '!'
  91 #define QUESTION        '?'
  92 #define QUOTE           '\\'
  93 #define RANGE           '-'
  94 #define RBRACKET        ']'
  95 #define SEP             '/'
  96 #define STAR            '*'
  97 #define TILDE           '~'
  98 #define UNDERSCORE      '_'
  99 #define LBRACE          '{'
 100 #define RBRACE          '}'
 101 #define SLASH           '/'
 102 #define COMMA           ','
 103
 104 #ifndef DEBUG
 105
 106 #define M_QUOTE         0x8000
 107 #define M_PROTECT       0x4000
 108 #define M_MASK          0xffff
 109 #define M_ASCII         0x00ff
 110
 111 typedef u_short Char;
 112
 113 #else
 114
 115 #define M_QUOTE         0x80
 116 #define M_PROTECT       0x40
 117 #define M_MASK          0xff
 118 #define M_ASCII         0x7f
 119
 120 typedef char Char;
 121
 122 #endif
 123
 124
 125 #define CHAR(c)         ((Char)((c)&M_ASCII))
 126 #define META(c)         ((Char)((c)|M_QUOTE))
 127 #define M_ALL           META('*')
 128 #define M_END           META(']')
 129 #define M_NOT           META('!')
 130 #define M_ONE           META('?')
 131 #define M_RNG           META('-')
 132 #define M_SET           META('[')
 133 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 134
 135
 136 static int       compare(const void *, const void *);
 137 static int       g_Ctoc(const Char *, char *, u_int);
 138 static int       g_lstat(Char *, struct stat *, glob_t *);
 139 static DIR      *g_opendir(Char *, glob_t *);
 140 static Char     *g_strchr(Char *, int);
 141 #ifdef notdef
 142 static Char     *g_strcat(Char *, const Char *);
 143 #endif
 144 static int       g_stat(Char *, struct stat *, glob_t *);
 145 static int       glob0(const Char *, glob_t *, int *);
 146 static int       glob1(Char *, glob_t *, int *);
 147 static int       glob2(Char *, Char *, Char *, Char *, glob_t *, int *);
 148 static int       glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, int *);
 149 static int       globextend(const Char *, glob_t *, int *);
 150 static const Char *
 151                  globtilde(const Char *, Char *, size_t, glob_t *);
 152 static int       globexp1(const Char *, glob_t *, int *);
 153 static int       globexp2(const Char *, const Char *, glob_t *, int *, int *);
 154 static int       match(Char *, Char *, Char *);
 155 #ifdef DEBUG
 156 static void      qprintf(const char *, Char *);
 157 #endif
 158
 159 int
 160 glob(pattern, flags, errfunc, pglob)
 161         const char *__restrict pattern;
 162         int flags, (*errfunc)(const char *, int);
 163         glob_t *__restrict pglob;
 164 {
 165         const u_char *patnext;
 166         int c, limit;
 167         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 168
 169         patnext = (u_char *) pattern;
 170         if (!(flags & GLOB_APPEND)) {
 171                 pglob->gl_pathc = 0;
 172                 pglob->gl_pathv = NULL;
 173                 if (!(flags & GLOB_DOOFFS))
 174                         pglob->gl_offs = 0;
 175         }
 176         if (flags & GLOB_LIMIT) {
 177                 limit = pglob->gl_matchc;
 178                 if (limit == 0)
 179                         limit = ARG_MAX;
 180         } else
 181                 limit = 0;
 182         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 183         pglob->gl_errfunc = errfunc;
 184         pglob->gl_matchc = 0;
 185
 186         bufnext = patbuf;
 187         bufend = bufnext + MAXPATHLEN - 1;
 188         if (flags & GLOB_QUOTE) {
 189                 /* Protect the quoted characters. */
 190                 while (bufnext < bufend && (c = *patnext++) != EOS)
 191                         if (c == QUOTE) {
 192                                 if ((c = *patnext++) == EOS) {
 193                                         c = QUOTE;
 194                                         --patnext;
 195                                 }
 196                                 *bufnext++ = c | M_PROTECT;
 197                         }
 198                         else
 199                                 *bufnext++ = c;
 200         }
 201         else
 202             while (bufnext < bufend && (c = *patnext++) != EOS)
 203                     *bufnext++ = c;
 204         *bufnext = EOS;
 205
 206         if (flags & GLOB_BRACE)
 207             return globexp1(patbuf, pglob, &limit);
 208         else
 209             return glob0(patbuf, pglob, &limit);
 210 }
 211
 212 /*
 213  * Expand recursively a glob {} pattern. When there is no more expansion
 214  * invoke the standard globbing routine to glob the rest of the magic
 215  * characters
 216  */
 217 static int
 218 globexp1(pattern, pglob, limit)
 219         const Char *pattern;
 220         glob_t *pglob;
 221         int *limit;
 222 {
 223         const Char* ptr = pattern;
 224         int rv;
 225
 226         /* Protect a single {}, for find(1), like csh */
 227         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 228                 return glob0(pattern, pglob, limit);
 229
 230         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 231                 if (!globexp2(ptr, pattern, pglob, &rv, limit))
 232                         return rv;
 233
 234         return glob0(pattern, pglob, limit);
 235 }
 236
 237
 238 /*
 239  * Recursive brace globbing helper. Tries to expand a single brace.
 240  * If it succeeds then it invokes globexp1 with the new pattern.
 241  * If it fails then it tries to glob the rest of the pattern and returns.
 242  */
 243 static int
 244 globexp2(ptr, pattern, pglob, rv, limit)
 245         const Char *ptr, *pattern;
 246         glob_t *pglob;
 247         int *rv, *limit;
 248 {
 249         int     i;
 250         Char   *lm, *ls;
 251         const Char *pe, *pm, *pl;
 252         Char    patbuf[MAXPATHLEN];
 253
 254         /* copy part up to the brace */
 255         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 256                 continue;
 257         *lm = EOS;
 258         ls = lm;
 259
 260         /* Find the balanced brace */
 261         for (i = 0, pe = ++ptr; *pe; pe++)
 262                 if (*pe == LBRACKET) {
 263                         /* Ignore everything between [] */
 264                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 265                                 continue;
 266                         if (*pe == EOS) {
 267                                 /*
 268                                  * We could not find a matching RBRACKET.
 269                                  * Ignore and just look for RBRACE
 270                                  */
 271                                 pe = pm;
 272                         }
 273                 }
 274                 else if (*pe == LBRACE)
 275                         i++;
 276                 else if (*pe == RBRACE) {
 277                         if (i == 0)
 278                                 break;
 279                         i--;
 280                 }
 281
 282         /* Non matching braces; just glob the pattern */
 283         if (i != 0 || *pe == EOS) {
 284                 *rv = glob0(patbuf, pglob, limit);
 285                 return 0;
 286         }
 287
 288         for (i = 0, pl = pm = ptr; pm <= pe; pm++)
 289                 switch (*pm) {
 290                 case LBRACKET:
 291                         /* Ignore everything between [] */
 292                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 293                                 continue;
 294                         if (*pm == EOS) {
 295                                 /*
 296                                  * We could not find a matching RBRACKET.
 297                                  * Ignore and just look for RBRACE
 298                                  */
 299                                 pm = pl;
 300                         }
 301                         break;
 302
 303                 case LBRACE:
 304                         i++;
 305                         break;
 306
 307                 case RBRACE:
 308                         if (i) {
 309                             i--;
 310                             break;
 311                         }
 312                         /* FALLTHROUGH */
 313                 case COMMA:
 314                         if (i && *pm == COMMA)
 315                                 break;
 316                         else {
 317                                 /* Append the current string */
 318                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 319                                         continue;
 320                                 /*
 321                                  * Append the rest of the pattern after the
 322                                  * closing brace
 323                                  */
 324                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
 325                                         continue;
 326
 327                                 /* Expand the current pattern */
 328 #ifdef DEBUG
 329                                 qprintf("globexp2:", patbuf);
 330 #endif
 331                                 *rv = globexp1(patbuf, pglob, limit);
 332
 333                                 /* move after the comma, to the next string */
 334                                 pl = pm + 1;
 335                         }
 336                         break;
 337
 338                 default:
 339                         break;
 340                 }
 341         *rv = 0;
 342         return 0;
 343 }
 344
 345
 346
 347 /*
 348  * expand tilde from the passwd file.
 349  */
 350 static const Char *
 351 globtilde(pattern, patbuf, patbuf_len, pglob)
 352         const Char *pattern;
 353         Char *patbuf;
 354         size_t patbuf_len;
 355         glob_t *pglob;
 356 {
 357         struct passwd *pwd;
 358         char *h;
 359         const Char *p;
 360         Char *b, *eb;
 361
 362         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 363                 return pattern;
 364
 365         /*
 366          * Copy up to the end of the string or /
 367          */
 368         eb = &patbuf[patbuf_len - 1];
 369         for (p = pattern + 1, h = (char *) patbuf;
 370             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 371                 continue;
 372
 373         *h = EOS;
 374
 375         if (((char *) patbuf)[0] == EOS) {
 376                 /*
 377                  * handle a plain ~ or ~/ by expanding $HOME first (iff
 378                  * we're not running setuid or setgid) and then trying
 379                  * the password file
 380                  */
 381                 if (
 382 #ifndef __NETBSD_SYSCALLS
 383                     issetugid() != 0 ||
 384 #endif
 385                     (h = getenv("HOME")) == NULL) {
 386 /* If we are not EL/IX level 4, we cannot use getpwxxx interfaces */
 387 #if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
 388                         if (((h = getlogin()) != NULL &&
 389                              (pwd = getpwnam(h)) != NULL) ||
 390                             (pwd = getpwuid(getuid())) != NULL)
 391                                 h = pwd->pw_dir;
 392                         else
 393 #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
 394                                 return pattern;
 395                 }
 396         }
 397         else {
 398                 /*
 399                  * Expand a ~user
 400                  */
 401
 402 #if !defined(_ELIX_LEVEL) || _ELIX_LEVEL >= 4
 403                 if ((pwd = getpwnam((char*) patbuf)) != NULL)
 404                         h = pwd->pw_dir;
 405                 else
 406 #endif /* !_ELIX_LEVEL || _ELIX_LEVEL >= 4 */
 407                         return pattern;
 408         }
 409
 410         /* Copy the home directory */
 411         for (b = patbuf; b < eb && *h; *b++ = *h++)
 412                 continue;
 413
 414         /* Append the rest of the pattern */
 415         while (b < eb && (*b++ = *p++) != EOS)
 416                 continue;
 417         *b = EOS;
 418
 419         return patbuf;
 420 }
 421
 422
 423 /*
 424  * The main glob() routine: compiles the pattern (optionally processing
 425  * quotes), calls glob1() to do the real pattern matching, and finally
 426  * sorts the list (unless unsorted operation is requested).  Returns 0
 427  * if things went well, nonzero if errors occurred.  It is not an error
 428  * to find no matches.
 429  */
 430 static int
 431 glob0(pattern, pglob, limit)
 432         const Char *pattern;
 433         glob_t *pglob;
 434         int *limit;
 435 {
 436         const Char *qpatnext;
 437         int c, err, oldpathc;
 438         Char *bufnext, patbuf[MAXPATHLEN];
 439
 440         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 441         oldpathc = pglob->gl_pathc;
 442         bufnext = patbuf;
 443
 444         /* We don't need to check for buffer overflow any more. */
 445         while ((c = *qpatnext++) != EOS) {
 446                 switch (c) {
 447                 case LBRACKET:
 448                         c = *qpatnext;
 449                         if (c == NOT)
 450                                 ++qpatnext;
 451                         if (*qpatnext == EOS ||
 452                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 453                                 *bufnext++ = LBRACKET;
 454                                 if (c == NOT)
 455                                         --qpatnext;
 456                                 break;
 457                         }
 458                         *bufnext++ = M_SET;
 459                         if (c == NOT)
 460                                 *bufnext++ = M_NOT;
 461                         c = *qpatnext++;
 462                         do {
 463                                 *bufnext++ = CHAR(c);
 464                                 if (*qpatnext == RANGE &&
 465                                     (c = qpatnext[1]) != RBRACKET) {
 466                                         *bufnext++ = M_RNG;
 467                                         *bufnext++ = CHAR(c);
 468                                         qpatnext += 2;
 469                                 }
 470                         } while ((c = *qpatnext++) != RBRACKET);
 471                         pglob->gl_flags |= GLOB_MAGCHAR;
 472                         *bufnext++ = M_END;
 473                         break;
 474                 case QUESTION:
 475                         pglob->gl_flags |= GLOB_MAGCHAR;
 476                         *bufnext++ = M_ONE;
 477                         break;
 478                 case STAR:
 479                         pglob->gl_flags |= GLOB_MAGCHAR;
 480                         /* collapse adjacent stars to one,
 481                          * to avoid exponential behavior
 482                          */
 483                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 484                             *bufnext++ = M_ALL;
 485                         break;
 486                 default:
 487                         *bufnext++ = CHAR(c);
 488                         break;
 489                 }
 490         }
 491         *bufnext = EOS;
 492 #ifdef DEBUG
 493         qprintf("glob0:", patbuf);
 494 #endif
 495
 496         if ((err = glob1(patbuf, pglob, limit)) != 0)
 497                 return(err);
 498
 499         /*
 500          * If there was no match we are going to append the pattern
 501          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 502          * and the pattern did not contain any magic characters
 503          * GLOB_NOMAGIC is there just for compatibility with csh.
 504          */
 505         if (pglob->gl_pathc == oldpathc) {
 506                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 507                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 508                     !(pglob->gl_flags & GLOB_MAGCHAR)))
 509                         return(globextend(pattern, pglob, limit));
 510                 else
 511                         return(GLOB_NOMATCH);
 512         }
 513         else if (!(pglob->gl_flags & GLOB_NOSORT))
 514                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 515                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 516         return(0);
 517 }
 518
 519 static int
 520 compare(p, q)
 521         const void *p, *q;
 522 {
 523         return(strcmp(*(char **)p, *(char **)q));
 524 }
 525
 526 static int
 527 glob1(pattern, pglob, limit)
 528         Char *pattern;
 529         glob_t *pglob;
 530         int *limit;
 531 {
 532         Char pathbuf[MAXPATHLEN];
 533
 534         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 535         if (*pattern == EOS)
 536                 return(0);
 537         return(glob2(pathbuf, pathbuf, pathbuf + MAXPATHLEN - 1,
 538             pattern, pglob, limit));
 539 }
 540
 541 /*
 542  * The functions glob2 and glob3 are mutually recursive; there is one level
 543  * of recursion for each segment in the pattern that contains one or more
 544  * meta characters.
 545  */
 546 static int
 547 glob2(pathbuf, pathend, pathend_last, pattern, pglob, limit)
 548         Char *pathbuf, *pathend, *pathend_last, *pattern;
 549         glob_t *pglob;
 550         int *limit;
 551 {
 552         struct stat sb;
 553         Char *p, *q;
 554         int anymeta;
 555
 556         /*
 557          * Loop over pattern segments until end of pattern or until
 558          * segment with meta character found.
 559          */
 560         for (anymeta = 0;;) {
 561                 if (*pattern == EOS) {          /* End of pattern? */
 562                         *pathend = EOS;
 563                         if (g_lstat(pathbuf, &sb, pglob))
 564                                 return(0);
 565
 566                         if (((pglob->gl_flags & GLOB_MARK) &&
 567                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode)
 568                             || (S_ISLNK(sb.st_mode) &&
 569                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 570                             S_ISDIR(sb.st_mode)))) {
 571                                 if (pathend + 1 > pathend_last)
 572                                         return (1);
 573                                 *pathend++ = SEP;
 574                                 *pathend = EOS;
 575                         }
 576                         ++pglob->gl_matchc;
 577                         return(globextend(pathbuf, pglob, limit));
 578                 }
 579
 580                 /* Find end of next segment, copy tentatively to pathend. */
 581                 q = pathend;
 582                 p = pattern;
 583                 while (*p != EOS && *p != SEP) {
 584                         if (ismeta(*p))
 585                                 anymeta = 1;
 586                         if (q + 1 > pathend_last)
 587                                 return (1);
 588                         *q++ = *p++;
 589                 }
 590
 591                 if (!anymeta) {         /* No expansion, do next segment. */
 592                         pathend = q;
 593                         pattern = p;
 594                         while (*pattern == SEP) {
 595                                 if (pathend + 1 > pathend_last)
 596                                         return (1);
 597                                 *pathend++ = *pattern++;
 598                         }
 599                 } else                  /* Need expansion, recurse. */
 600                         return(glob3(pathbuf, pathend, pathend_last, pattern, p,
 601                             pglob, limit));
 602         }
 603         /* NOTREACHED */
 604 }
 605
 606 static int
 607 glob3(pathbuf, pathend, pathend_last, pattern, restpattern, pglob, limit)
 608         Char *pathbuf, *pathend, *pathend_last, *pattern, *restpattern;
 609         glob_t *pglob;
 610         int *limit;
 611 {
 612         struct dirent *dp;
 613         DIR *dirp;
 614         int err;
 615         char buf[MAXPATHLEN];
 616
 617         /*
 618          * The readdirfunc declaration can't be prototyped, because it is
 619          * assigned, below, to two functions which are prototyped in glob.h
 620          * and dirent.h as taking pointers to differently typed opaque
 621          * structures.
 622          */
 623         struct dirent *(*readdirfunc)();
 624
 625         if (pathend > pathend_last)
 626                 return (1);
 627         *pathend = EOS;
 628         errno = 0;
 629
 630         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 631                 /* TODO: don't call for ENOENT or ENOTDIR? */
 632                 if (pglob->gl_errfunc) {
 633                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 634                                 return (GLOB_ABEND);
 635                         if (pglob->gl_errfunc(buf, errno) ||
 636                             pglob->gl_flags & GLOB_ERR)
 637                                 return (GLOB_ABEND);
 638                 }
 639                 return(0);
 640         }
 641
 642         err = 0;
 643
 644         /* Search directory for matching names. */
 645         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 646                 readdirfunc = pglob->gl_readdir;
 647         else
 648                 readdirfunc = readdir;
 649         while ((dp = (*readdirfunc)(dirp))) {
 650                 u_char *sc;
 651                 Char *dc;
 652
 653                 /* Initial DOT must be matched literally. */
 654                 if (dp->d_name[0] == DOT && *pattern != DOT)
 655                         continue;
 656                 dc = pathend;
 657                 sc = (u_char *) dp->d_name;
 658                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 659                         ;
 660                 if (!match(pathend, pattern, restpattern)) {
 661                         *pathend = EOS;
 662                         continue;
 663                 }
 664                 err = glob2(pathbuf, --dc, pathend_last, restpattern,
 665                     pglob, limit);
 666                 if (err)
 667                         break;
 668         }
 669
 670         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 671                 (*pglob->gl_closedir)(dirp);
 672         else
 673                 closedir(dirp);
 674         return(err);
 675 }
 676
 677
 678 /*
 679  * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
 680  * add the new item, and update gl_pathc.
 681  *
 682  * This assumes the BSD realloc, which only copies the block when its size
 683  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 684  * behavior.
 685  *
 686  * Return 0 if new item added, error code if memory couldn't be allocated.
 687  *
 688  * Invariant of the glob_t structure:
 689  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 690  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 691  */
 692 static int
 693 globextend(path, pglob, limit)
 694         const Char *path;
 695         glob_t *pglob;
 696         int *limit;
 697 {
 698         char **pathv;
 699         int i;
 700         u_int newsize, len;
 701         char *copy;
 702         const Char *p;
 703
 704         if (*limit && pglob->gl_pathc > *limit) {
 705                 errno = 0;
 706                 return (GLOB_NOSPACE);
 707         }
 708
 709         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 710         pathv = pglob->gl_pathv ?
 711                     realloc((char *)pglob->gl_pathv, newsize) :
 712                     malloc(newsize);
 713         if (pathv == NULL) {
 714                 if (pglob->gl_pathv) {
 715                         free(pglob->gl_pathv);
 716                         pglob->gl_pathv = NULL;
 717                 }
 718                 return(GLOB_NOSPACE);
 719         }
 720
 721         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 722                 /* first time around -- clear initial gl_offs items */
 723                 pathv += pglob->gl_offs;
 724                 for (i = pglob->gl_offs; --i >= 0; )
 725                         *--pathv = NULL;
 726         }
 727         pglob->gl_pathv = pathv;
 728
 729         for (p = path; *p++;)
 730                 continue;
 731         len = (size_t)(p - path);
 732         if ((copy = malloc(len)) != NULL) {
 733                 if (g_Ctoc(path, copy, len)) {
 734                         free(copy);
 735                         return (GLOB_NOSPACE);
 736                 }
 737                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 738         }
 739         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 740         return(copy == NULL ? GLOB_NOSPACE : 0);
 741 }
 742
 743 /*
 744  * pattern matching function for filenames.  Each occurrence of the *
 745  * pattern causes a recursion level.
 746  */
 747 static int
 748 match(name, pat, patend)
 749         Char *name, *pat, *patend;
 750 {
 751         int ok, negate_range;
 752         Char c, k;
 753
 754         while (pat < patend) {
 755                 c = *pat++;
 756                 switch (c & M_MASK) {
 757                 case M_ALL:
 758                         if (pat == patend)
 759                                 return(1);
 760                         do
 761                             if (match(name, pat, patend))
 762                                     return(1);
 763                         while (*name++ != EOS);
 764                         return(0);
 765                 case M_ONE:
 766                         if (*name++ == EOS)
 767                                 return(0);
 768                         break;
 769                 case M_SET:
 770                         ok = 0;
 771                         if ((k = *name++) == EOS)
 772                                 return(0);
 773                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 774                                 ++pat;
 775                         while (((c = *pat++) & M_MASK) != M_END)
 776                                 if ((*pat & M_MASK) == M_RNG) {
 777                                         if (__collate_load_error ?
 778                                             CHAR(c) <= CHAR(k) && CHAR(k) <= CHAR(pat[1]) :
 779                                                __collate_range_cmp(CHAR(c), CHAR(k)) <= 0
 780                                             && __collate_range_cmp(CHAR(k), CHAR(pat[1])) <= 0
 781                                            )
 782                                                 ok = 1;
 783                                         pat += 2;
 784                                 } else if (c == k)
 785                                         ok = 1;
 786                         if (ok == negate_range)
 787                                 return(0);
 788                         break;
 789                 default:
 790                         if (*name++ != c)
 791                                 return(0);
 792                         break;
 793                 }
 794         }
 795         return(*name == EOS);
 796 }
 797
 798 /* Free allocated data belonging to a glob_t structure. */
 799 void
 800 globfree(pglob)
 801         glob_t *pglob;
 802 {
 803         int i;
 804         char **pp;
 805
 806         if (pglob->gl_pathv != NULL) {
 807                 pp = pglob->gl_pathv + pglob->gl_offs;
 808                 for (i = pglob->gl_pathc; i--; ++pp)
 809                         if (*pp)
 810                                 free(*pp);
 811                 free(pglob->gl_pathv);
 812                 pglob->gl_pathv = NULL;
 813         }
 814 }
 815
 816 static DIR *
 817 g_opendir(str, pglob)
 818         Char *str;
 819         glob_t *pglob;
 820 {
 821         char buf[MAXPATHLEN];
 822
 823         if (!*str)
 824                 strcpy(buf, ".");
 825         else {
 826                 if (g_Ctoc(str, buf, sizeof(buf)))
 827                         return (NULL);
 828         }
 829
 830         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 831                 return((*pglob->gl_opendir)(buf));
 832
 833         return(opendir(buf));
 834 }
 835
 836 static int
 837 g_lstat(fn, sb, pglob)
 838         Char *fn;
 839         struct stat *sb;
 840         glob_t *pglob;
 841 {
 842         char buf[MAXPATHLEN];
 843
 844         if (g_Ctoc(fn, buf, sizeof(buf))) {
 845                 errno = ENAMETOOLONG;
 846                 return (-1);
 847         }
 848         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 849                 return((*pglob->gl_lstat)(buf, sb));
 850         return(lstat(buf, sb));
 851 }
 852
 853 static int
 854 g_stat(fn, sb, pglob)
 855         Char *fn;
 856         struct stat *sb;
 857         glob_t *pglob;
 858 {
 859         char buf[MAXPATHLEN];
 860
 861         if (g_Ctoc(fn, buf, sizeof(buf))) {
 862                 errno = ENAMETOOLONG;
 863                 return (-1);
 864         }
 865         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 866                 return((*pglob->gl_stat)(buf, sb));
 867         return(stat(buf, sb));
 868 }
 869
 870 static Char *
 871 g_strchr(str, ch)
 872         Char *str;
 873         int ch;
 874 {
 875         do {
 876                 if (*str == ch)
 877                         return (str);
 878         } while (*str++);
 879         return (NULL);
 880 }
 881
 882 static int
 883 g_Ctoc(str, buf, len)
 884         const Char *str;
 885         char *buf;
 886         u_int len;
 887 {
 888
 889         while (len--) {
 890                 if ((*buf++ = *str++) == '\0')
 891                         return (0);
 892         }
 893         return (1);
 894 }
 895
 896 #ifdef DEBUG
 897 static void
 898 qprintf(str, s)
 899         const char *str;
 900         Char *s;
 901 {
 902         Char *p;
 903
 904         (void)printf("%s:\n", str);
 905         for (p = s; *p; p++)
 906                 (void)printf("%c", CHAR(*p));
 907         (void)printf("\n");
 908         for (p = s; *p; p++)
 909                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 910         (void)printf("\n");
 911         for (p = s; *p; p++)
 912                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 913         (void)printf("\n");
 914 }
 915 #endif
 916 #endif /*  !_NO_GLOB */