openbsd-compat/glob.c

   1 /*      $OpenBSD: glob.c,v 1.33 2010/09/26 22:15:39 djm Exp $ */
   2 /*
   3  * Copyright (c) 1989, 1993
   4  *      The Regents of the University of California.  All rights reserved.
   5  *
   6  * This code is derived from software contributed to Berkeley by
   7  * Guido van Rossum.
   8  *
   9  * Redistribution and use in source and binary forms, with or without
  10  * modification, are permitted provided that the following conditions
  11  * are met:
  12  * 1. Redistributions of source code must retain the above copyright
  13  *    notice, this list of conditions and the following disclaimer.
  14  * 2. Redistributions in binary form must reproduce the above copyright
  15  *    notice, this list of conditions and the following disclaimer in the
  16  *    documentation and/or other materials provided with the distribution.
  17  * 3. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 /* OPENBSD ORIGINAL: lib/libc/gen/glob.c */
  35
  36 /*
  37  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  38  *
  39  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  40  *
  41  * Optional extra services, controlled by flags not defined by POSIX:
  42  *
  43  * GLOB_QUOTE:
  44  *      Escaping convention: \ inhibits any special meaning the following
  45  *      character might have (except \ at end of string is retained).
  46  * GLOB_MAGCHAR:
  47  *      Set in gl_flags if pattern contained a globbing character.
  48  * GLOB_NOMAGIC:
  49  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  50  *      not contain any magic characters.  [Used in csh style globbing]
  51  * GLOB_ALTDIRFUNC:
  52  *      Use alternately specified directory access functions.
  53  * GLOB_TILDE:
  54  *      expand ~user/foo to the /home/dir/of/user/foo
  55  * GLOB_BRACE:
  56  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  57  * gl_matchc:
  58  *      Number of matches in the current invocation of glob.
  59  */
  60
  61 #include "includes.h"
  62
  63 #include <sys/types.h>
  64 #include <sys/stat.h>
  65
  66 #include <dirent.h>
  67 #include <ctype.h>
  68 #include <errno.h>
  69 #include <pwd.h>
  70 #include <stdlib.h>
  71 #include <string.h>
  72 #include <unistd.h>
  73
  74 #if !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) || \
  75     !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) || \
  76     !defined(HAVE_DECL_GLOB_NOMATCH) || HAVE_DECL_GLOB_NOMATCH == 0 || \
  77     defined(BROKEN_GLOB)
  78
  79 static long
  80 get_arg_max(void)
  81 {
  82 #ifdef ARG_MAX
  83         return(ARG_MAX);
  84 #elif defined(HAVE_SYSCONF) && defined(_SC_ARG_MAX)
  85         return(sysconf(_SC_ARG_MAX));
  86 #else
  87         return(256); /* XXX: arbitrary */
  88 #endif
  89 }
  90
  91 #include "charclass.h"
  92
  93 #define DOLLAR          '$'
  94 #define DOT             '.'
  95 #define EOS             '\0'
  96 #define LBRACKET        '['
  97 #define NOT             '!'
  98 #define QUESTION        '?'
  99 #define QUOTE           '\\'
 100 #define RANGE           '-'
 101 #define RBRACKET        ']'
 102 #define SEP             '/'
 103 #define STAR            '*'
 104 #define TILDE           '~'
 105 #define UNDERSCORE      '_'
 106 #define LBRACE          '{'
 107 #define RBRACE          '}'
 108 #define SLASH           '/'
 109 #define COMMA           ','
 110
 111 #ifndef DEBUG
 112
 113 #define M_QUOTE         0x8000
 114 #define M_PROTECT       0x4000
 115 #define M_MASK          0xffff
 116 #define M_ASCII         0x00ff
 117
 118 typedef u_short Char;
 119
 120 #else
 121
 122 #define M_QUOTE         0x80
 123 #define M_PROTECT       0x40
 124 #define M_MASK          0xff
 125 #define M_ASCII         0x7f
 126
 127 typedef char Char;
 128
 129 #endif
 130
 131
 132 #define CHAR(c)         ((Char)((c)&M_ASCII))
 133 #define META(c)         ((Char)((c)|M_QUOTE))
 134 #define M_ALL           META('*')
 135 #define M_END           META(']')
 136 #define M_NOT           META('!')
 137 #define M_ONE           META('?')
 138 #define M_RNG           META('-')
 139 #define M_SET           META('[')
 140 #define M_CLASS         META(':')
 141 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 142
 143
 144 static int       compare(const void *, const void *);
 145 static int       g_Ctoc(const Char *, char *, u_int);
 146 static int       g_lstat(Char *, struct stat *, glob_t *);
 147 static DIR      *g_opendir(Char *, glob_t *);
 148 static Char     *g_strchr(const Char *, int);
 149 static int       g_strncmp(const Char *, const char *, size_t);
 150 static int       g_stat(Char *, struct stat *, glob_t *);
 151 static int       glob0(const Char *, glob_t *);
 152 static int       glob1(Char *, Char *, glob_t *, size_t *);
 153 static int       glob2(Char *, Char *, Char *, Char *, Char *, Char *,
 154                     glob_t *, size_t *);
 155 static int       glob3(Char *, Char *, Char *, Char *, Char *,
 156                     Char *, Char *, glob_t *, size_t *);
 157 static int       globextend(const Char *, glob_t *, size_t *, struct stat *);
 158 static const Char *
 159                  globtilde(const Char *, Char *, size_t, glob_t *);
 160 static int       globexp1(const Char *, glob_t *);
 161 static int       globexp2(const Char *, const Char *, glob_t *);
 162 static int       match(Char *, Char *, Char *);
 163 #ifdef DEBUG
 164 static void      qprintf(const char *, Char *);
 165 #endif
 166
 167 int
 168 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
 169     glob_t *pglob)
 170 {
 171         const u_char *patnext;
 172         int c;
 173         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 174
 175         patnext = (u_char *) pattern;
 176         if (!(flags & GLOB_APPEND)) {
 177                 pglob->gl_pathc = 0;
 178                 pglob->gl_pathv = NULL;
 179                 pglob->gl_statv = NULL;
 180                 if (!(flags & GLOB_DOOFFS))
 181                         pglob->gl_offs = 0;
 182         }
 183         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 184         pglob->gl_errfunc = errfunc;
 185         pglob->gl_matchc = 0;
 186
 187         bufnext = patbuf;
 188         bufend = bufnext + MAXPATHLEN - 1;
 189         if (flags & GLOB_NOESCAPE)
 190                 while (bufnext < bufend && (c = *patnext++) != EOS)
 191                         *bufnext++ = c;
 192         else {
 193                 /* Protect the quoted characters. */
 194                 while (bufnext < bufend && (c = *patnext++) != EOS)
 195                         if (c == QUOTE) {
 196                                 if ((c = *patnext++) == EOS) {
 197                                         c = QUOTE;
 198                                         --patnext;
 199                                 }
 200                                 *bufnext++ = c | M_PROTECT;
 201                         } else
 202                                 *bufnext++ = c;
 203         }
 204         *bufnext = EOS;
 205
 206         if (flags & GLOB_BRACE)
 207                 return globexp1(patbuf, pglob);
 208         else
 209                 return glob0(patbuf, pglob);
 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(const Char *pattern, glob_t *pglob)
 219 {
 220         const Char* ptr = pattern;
 221
 222         /* Protect a single {}, for find(1), like csh */
 223         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 224                 return glob0(pattern, pglob);
 225
 226         if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
 227                 return globexp2(ptr, pattern, pglob);
 228
 229         return glob0(pattern, pglob);
 230 }
 231
 232
 233 /*
 234  * Recursive brace globbing helper. Tries to expand a single brace.
 235  * If it succeeds then it invokes globexp1 with the new pattern.
 236  * If it fails then it tries to glob the rest of the pattern and returns.
 237  */
 238 static int
 239 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob)
 240 {
 241         int     i, rv;
 242         Char   *lm, *ls;
 243         const Char *pe, *pm, *pl;
 244         Char    patbuf[MAXPATHLEN];
 245
 246         /* copy part up to the brace */
 247         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 248                 ;
 249         *lm = EOS;
 250         ls = lm;
 251
 252         /* Find the balanced brace */
 253         for (i = 0, pe = ++ptr; *pe; pe++)
 254                 if (*pe == LBRACKET) {
 255                         /* Ignore everything between [] */
 256                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 257                                 ;
 258                         if (*pe == EOS) {
 259                                 /*
 260                                  * We could not find a matching RBRACKET.
 261                                  * Ignore and just look for RBRACE
 262                                  */
 263                                 pe = pm;
 264                         }
 265                 } else if (*pe == LBRACE)
 266                         i++;
 267                 else if (*pe == RBRACE) {
 268                         if (i == 0)
 269                                 break;
 270                         i--;
 271                 }
 272
 273         /* Non matching braces; just glob the pattern */
 274         if (i != 0 || *pe == EOS)
 275                 return glob0(patbuf, pglob);
 276
 277         for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
 278                 switch (*pm) {
 279                 case LBRACKET:
 280                         /* Ignore everything between [] */
 281                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 282                                 ;
 283                         if (*pm == EOS) {
 284                                 /*
 285                                  * We could not find a matching RBRACKET.
 286                                  * Ignore and just look for RBRACE
 287                                  */
 288                                 pm = pl;
 289                         }
 290                         break;
 291
 292                 case LBRACE:
 293                         i++;
 294                         break;
 295
 296                 case RBRACE:
 297                         if (i) {
 298                                 i--;
 299                                 break;
 300                         }
 301                         /* FALLTHROUGH */
 302                 case COMMA:
 303                         if (i && *pm == COMMA)
 304                                 break;
 305                         else {
 306                                 /* Append the current string */
 307                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 308                                         ;
 309
 310                                 /*
 311                                  * Append the rest of the pattern after the
 312                                  * closing brace
 313                                  */
 314                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
 315                                         ;
 316
 317                                 /* Expand the current pattern */
 318 #ifdef DEBUG
 319                                 qprintf("globexp2:", patbuf);
 320 #endif
 321                                 rv = globexp1(patbuf, pglob);
 322                                 if (rv && rv != GLOB_NOMATCH)
 323                                         return rv;
 324
 325                                 /* move after the comma, to the next string */
 326                                 pl = pm + 1;
 327                         }
 328                         break;
 329
 330                 default:
 331                         break;
 332                 }
 333         }
 334         return 0;
 335 }
 336
 337
 338
 339 /*
 340  * expand tilde from the passwd file.
 341  */
 342 static const Char *
 343 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 344 {
 345         struct passwd *pwd;
 346         char *h;
 347         const Char *p;
 348         Char *b, *eb;
 349
 350         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 351                 return pattern;
 352
 353         /* Copy up to the end of the string or / */
 354         eb = &patbuf[patbuf_len - 1];
 355         for (p = pattern + 1, h = (char *) patbuf;
 356             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 357                 ;
 358
 359         *h = EOS;
 360
 361 #if 0
 362         if (h == (char *)eb)
 363                 return what;
 364 #endif
 365
 366         if (((char *) patbuf)[0] == EOS) {
 367                 /*
 368                  * handle a plain ~ or ~/ by expanding $HOME
 369                  * first and then trying the password file
 370                  */
 371 #if 0
 372                 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
 373 #endif
 374                 if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
 375                         if ((pwd = getpwuid(getuid())) == NULL)
 376                                 return pattern;
 377                         else
 378                                 h = pwd->pw_dir;
 379                 }
 380         } else {
 381                 /*
 382                  * Expand a ~user
 383                  */
 384                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 385                         return pattern;
 386                 else
 387                         h = pwd->pw_dir;
 388         }
 389
 390         /* Copy the home directory */
 391         for (b = patbuf; b < eb && *h; *b++ = *h++)
 392                 ;
 393
 394         /* Append the rest of the pattern */
 395         while (b < eb && (*b++ = *p++) != EOS)
 396                 ;
 397         *b = EOS;
 398
 399         return patbuf;
 400 }
 401
 402 static int
 403 g_strncmp(const Char *s1, const char *s2, size_t n)
 404 {
 405         int rv = 0;
 406
 407         while (n--) {
 408                 rv = *(Char *)s1 - *(const unsigned char *)s2++;
 409                 if (rv)
 410                         break;
 411                 if (*s1++ == '\0')
 412                         break;
 413         }
 414         return rv;
 415 }
 416
 417 static int
 418 g_charclass(const Char **patternp, Char **bufnextp)
 419 {
 420         const Char *pattern = *patternp + 1;
 421         Char *bufnext = *bufnextp;
 422         const Char *colon;
 423         struct cclass *cc;
 424         size_t len;
 425
 426         if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
 427                 return 1;       /* not a character class */
 428
 429         len = (size_t)(colon - pattern);
 430         for (cc = cclasses; cc->name != NULL; cc++) {
 431                 if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
 432                         break;
 433         }
 434         if (cc->name == NULL)
 435                 return -1;      /* invalid character class */
 436         *bufnext++ = M_CLASS;
 437         *bufnext++ = (Char)(cc - &cclasses[0]);
 438         *bufnextp = bufnext;
 439         *patternp += len + 3;
 440
 441         return 0;
 442 }
 443
 444 /*
 445  * The main glob() routine: compiles the pattern (optionally processing
 446  * quotes), calls glob1() to do the real pattern matching, and finally
 447  * sorts the list (unless unsorted operation is requested).  Returns 0
 448  * if things went well, nonzero if errors occurred.  It is not an error
 449  * to find no matches.
 450  */
 451 static int
 452 glob0(const Char *pattern, glob_t *pglob)
 453 {
 454         const Char *qpatnext;
 455         int c, err, oldpathc;
 456         Char *bufnext, patbuf[MAXPATHLEN];
 457         size_t limit = 0;
 458
 459         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 460         oldpathc = pglob->gl_pathc;
 461         bufnext = patbuf;
 462
 463         /* We don't need to check for buffer overflow any more. */
 464         while ((c = *qpatnext++) != EOS) {
 465                 switch (c) {
 466                 case LBRACKET:
 467                         c = *qpatnext;
 468                         if (c == NOT)
 469                                 ++qpatnext;
 470                         if (*qpatnext == EOS ||
 471                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 472                                 *bufnext++ = LBRACKET;
 473                                 if (c == NOT)
 474                                         --qpatnext;
 475                                 break;
 476                         }
 477                         *bufnext++ = M_SET;
 478                         if (c == NOT)
 479                                 *bufnext++ = M_NOT;
 480                         c = *qpatnext++;
 481                         do {
 482                                 if (c == LBRACKET && *qpatnext == ':') {
 483                                         do {
 484                                                 err = g_charclass(&qpatnext,
 485                                                     &bufnext);
 486                                                 if (err)
 487                                                         break;
 488                                                 c = *qpatnext++;
 489                                         } while (c == LBRACKET && *qpatnext == ':');
 490                                         if (err == -1 &&
 491                                             !(pglob->gl_flags & GLOB_NOCHECK))
 492                                                 return GLOB_NOMATCH;
 493                                         if (c == RBRACKET)
 494                                                 break;
 495                                 }
 496                                 *bufnext++ = CHAR(c);
 497                                 if (*qpatnext == RANGE &&
 498                                     (c = qpatnext[1]) != RBRACKET) {
 499                                         *bufnext++ = M_RNG;
 500                                         *bufnext++ = CHAR(c);
 501                                         qpatnext += 2;
 502                                 }
 503                         } while ((c = *qpatnext++) != RBRACKET);
 504                         pglob->gl_flags |= GLOB_MAGCHAR;
 505                         *bufnext++ = M_END;
 506                         break;
 507                 case QUESTION:
 508                         pglob->gl_flags |= GLOB_MAGCHAR;
 509                         *bufnext++ = M_ONE;
 510                         break;
 511                 case STAR:
 512                         pglob->gl_flags |= GLOB_MAGCHAR;
 513                         /* collapse adjacent stars to one,
 514                          * to avoid exponential behavior
 515                          */
 516                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 517                                 *bufnext++ = M_ALL;
 518                         break;
 519                 default:
 520                         *bufnext++ = CHAR(c);
 521                         break;
 522                 }
 523         }
 524         *bufnext = EOS;
 525 #ifdef DEBUG
 526         qprintf("glob0:", patbuf);
 527 #endif
 528
 529         if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, &limit)) != 0)
 530                 return(err);
 531
 532         /*
 533          * If there was no match we are going to append the pattern
 534          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 535          * and the pattern did not contain any magic characters
 536          * GLOB_NOMAGIC is there just for compatibility with csh.
 537          */
 538         if (pglob->gl_pathc == oldpathc) {
 539                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 540                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 541                     !(pglob->gl_flags & GLOB_MAGCHAR)))
 542                         return(globextend(pattern, pglob, &limit, NULL));
 543                 else
 544                         return(GLOB_NOMATCH);
 545         }
 546         if (!(pglob->gl_flags & GLOB_NOSORT))
 547                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 548                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 549         return(0);
 550 }
 551
 552 static int
 553 compare(const void *p, const void *q)
 554 {
 555         return(strcmp(*(char **)p, *(char **)q));
 556 }
 557
 558 static int
 559 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 560 {
 561         Char pathbuf[MAXPATHLEN];
 562
 563         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 564         if (*pattern == EOS)
 565                 return(0);
 566         return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
 567             pathbuf, pathbuf+MAXPATHLEN-1,
 568             pattern, pattern_last, pglob, limitp));
 569 }
 570
 571 /*
 572  * The functions glob2 and glob3 are mutually recursive; there is one level
 573  * of recursion for each segment in the pattern that contains one or more
 574  * meta characters.
 575  */
 576 static int
 577 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 578     Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 579 {
 580         struct stat sb;
 581         Char *p, *q;
 582         int anymeta;
 583
 584         /*
 585          * Loop over pattern segments until end of pattern or until
 586          * segment with meta character found.
 587          */
 588         for (anymeta = 0;;) {
 589                 if (*pattern == EOS) {          /* End of pattern? */
 590                         *pathend = EOS;
 591                         if (g_lstat(pathbuf, &sb, pglob))
 592                                 return(0);
 593
 594                         if (((pglob->gl_flags & GLOB_MARK) &&
 595                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
 596                             (S_ISLNK(sb.st_mode) &&
 597                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 598                             S_ISDIR(sb.st_mode)))) {
 599                                 if (pathend+1 > pathend_last)
 600                                         return (1);
 601                                 *pathend++ = SEP;
 602                                 *pathend = EOS;
 603                         }
 604                         ++pglob->gl_matchc;
 605                         return(globextend(pathbuf, pglob, limitp, &sb));
 606                 }
 607
 608                 /* Find end of next segment, copy tentatively to pathend. */
 609                 q = pathend;
 610                 p = pattern;
 611                 while (*p != EOS && *p != SEP) {
 612                         if (ismeta(*p))
 613                                 anymeta = 1;
 614                         if (q+1 > pathend_last)
 615                                 return (1);
 616                         *q++ = *p++;
 617                 }
 618
 619                 if (!anymeta) {         /* No expansion, do next segment. */
 620                         pathend = q;
 621                         pattern = p;
 622                         while (*pattern == SEP) {
 623                                 if (pathend+1 > pathend_last)
 624                                         return (1);
 625                                 *pathend++ = *pattern++;
 626                         }
 627                 } else
 628                         /* Need expansion, recurse. */
 629                         return(glob3(pathbuf, pathbuf_last, pathend,
 630                             pathend_last, pattern, p, pattern_last,
 631                             pglob, limitp));
 632         }
 633         /* NOTREACHED */
 634 }
 635
 636 static int
 637 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 638     Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
 639     size_t *limitp)
 640 {
 641         struct dirent *dp;
 642         DIR *dirp;
 643         int err;
 644         char buf[MAXPATHLEN];
 645
 646         /*
 647          * The readdirfunc declaration can't be prototyped, because it is
 648          * assigned, below, to two functions which are prototyped in glob.h
 649          * and dirent.h as taking pointers to differently typed opaque
 650          * structures.
 651          */
 652         struct dirent *(*readdirfunc)(void *);
 653
 654         if (pathend > pathend_last)
 655                 return (1);
 656         *pathend = EOS;
 657         errno = 0;
 658
 659         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 660                 /* TODO: don't call for ENOENT or ENOTDIR? */
 661                 if (pglob->gl_errfunc) {
 662                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 663                                 return(GLOB_ABORTED);
 664                         if (pglob->gl_errfunc(buf, errno) ||
 665                             pglob->gl_flags & GLOB_ERR)
 666                                 return(GLOB_ABORTED);
 667                 }
 668                 return(0);
 669         }
 670
 671         err = 0;
 672
 673         /* Search directory for matching names. */
 674         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 675                 readdirfunc = pglob->gl_readdir;
 676         else
 677                 readdirfunc = (struct dirent *(*)(void *))readdir;
 678         while ((dp = (*readdirfunc)(dirp))) {
 679                 u_char *sc;
 680                 Char *dc;
 681
 682                 /* Initial DOT must be matched literally. */
 683                 if (dp->d_name[0] == DOT && *pattern != DOT)
 684                         continue;
 685                 dc = pathend;
 686                 sc = (u_char *) dp->d_name;
 687                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 688                         ;
 689                 if (dc >= pathend_last) {
 690                         *dc = EOS;
 691                         err = 1;
 692                         break;
 693                 }
 694
 695                 if (!match(pathend, pattern, restpattern)) {
 696                         *pathend = EOS;
 697                         continue;
 698                 }
 699                 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
 700                     restpattern, restpattern_last, pglob, limitp);
 701                 if (err)
 702                         break;
 703         }
 704
 705         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 706                 (*pglob->gl_closedir)(dirp);
 707         else
 708                 closedir(dirp);
 709         return(err);
 710 }
 711
 712
 713 /*
 714  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 715  * add the new item, and update gl_pathc.
 716  *
 717  * This assumes the BSD realloc, which only copies the block when its size
 718  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 719  * behavior.
 720  *
 721  * Return 0 if new item added, error code if memory couldn't be allocated.
 722  *
 723  * Invariant of the glob_t structure:
 724  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 725  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 726  */
 727 static int
 728 globextend(const Char *path, glob_t *pglob, size_t *limitp, struct stat *sb)
 729 {
 730         char **pathv;
 731         ssize_t i;
 732         size_t newn, len;
 733         char *copy = NULL;
 734         const Char *p;
 735         struct stat **statv;
 736
 737         newn = 2 + pglob->gl_pathc + pglob->gl_offs;
 738         if (SIZE_MAX / sizeof(*pathv) <= newn ||
 739             SIZE_MAX / sizeof(*statv) <= newn) {
 740  nospace:
 741                 for (i = pglob->gl_offs; i < newn - 2; i++) {
 742                         if (pglob->gl_pathv && pglob->gl_pathv[i])
 743                                 free(pglob->gl_pathv[i]);
 744                         if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
 745                             pglob->gl_pathv && pglob->gl_pathv[i])
 746                                 free(pglob->gl_statv[i]);
 747                 }
 748                 if (pglob->gl_pathv) {
 749                         free(pglob->gl_pathv);
 750                         pglob->gl_pathv = NULL;
 751                 }
 752                 if (pglob->gl_statv) {
 753                         free(pglob->gl_statv);
 754                         pglob->gl_statv = NULL;
 755                 }
 756                 return(GLOB_NOSPACE);
 757         }
 758
 759         pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
 760         if (pathv == NULL)
 761                 goto nospace;
 762         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 763                 /* first time around -- clear initial gl_offs items */
 764                 pathv += pglob->gl_offs;
 765                 for (i = pglob->gl_offs; --i >= 0; )
 766                         *--pathv = NULL;
 767         }
 768         pglob->gl_pathv = pathv;
 769
 770         if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
 771                 statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
 772                 if (statv == NULL)
 773                         goto nospace;
 774                 if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
 775                         /* first time around -- clear initial gl_offs items */
 776                         statv += pglob->gl_offs;
 777                         for (i = pglob->gl_offs; --i >= 0; )
 778                                 *--statv = NULL;
 779                 }
 780                 pglob->gl_statv = statv;
 781                 if (sb == NULL)
 782                         statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 783                 else {
 784                         if ((statv[pglob->gl_offs + pglob->gl_pathc] =
 785                             malloc(sizeof(**statv))) == NULL)
 786                                 goto copy_error;
 787                         memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
 788                             sizeof(*sb));
 789                 }
 790                 statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
 791         }
 792
 793         for (p = path; *p++;)
 794                 ;
 795         len = (size_t)(p - path);
 796         *limitp += len;
 797         if ((copy = malloc(len)) != NULL) {
 798                 if (g_Ctoc(path, copy, len)) {
 799                         free(copy);
 800                         return(GLOB_NOSPACE);
 801                 }
 802                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 803         }
 804         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 805
 806         if ((pglob->gl_flags & GLOB_LIMIT) &&
 807             (newn * sizeof(*pathv)) + *limitp >= (u_int) get_arg_max()) {
 808                 errno = 0;
 809                 return(GLOB_NOSPACE);
 810         }
 811  copy_error:
 812         return(copy == NULL ? GLOB_NOSPACE : 0);
 813 }
 814
 815
 816 /*
 817  * pattern matching function for filenames.  Each occurrence of the *
 818  * pattern causes a recursion level.
 819  */
 820 static int
 821 match(Char *name, Char *pat, Char *patend)
 822 {
 823         int ok, negate_range;
 824         Char c, k;
 825
 826         while (pat < patend) {
 827                 c = *pat++;
 828                 switch (c & M_MASK) {
 829                 case M_ALL:
 830                         if (pat == patend)
 831                                 return(1);
 832                         do {
 833                             if (match(name, pat, patend))
 834                                     return(1);
 835                         } while (*name++ != EOS);
 836                         return(0);
 837                 case M_ONE:
 838                         if (*name++ == EOS)
 839                                 return(0);
 840                         break;
 841                 case M_SET:
 842                         ok = 0;
 843                         if ((k = *name++) == EOS)
 844                                 return(0);
 845                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 846                                 ++pat;
 847                         while (((c = *pat++) & M_MASK) != M_END) {
 848                                 if ((c & M_MASK) == M_CLASS) {
 849                                         int idx = *pat & M_MASK;
 850                                         if (idx < NCCLASSES &&
 851                                             cclasses[idx].isctype(k))
 852                                                 ok = 1;
 853                                         ++pat;
 854                                 }
 855                                 if ((*pat & M_MASK) == M_RNG) {
 856                                         if (c <= k && k <= pat[1])
 857                                                 ok = 1;
 858                                         pat += 2;
 859                                 } else if (c == k)
 860                                         ok = 1;
 861                         }
 862                         if (ok == negate_range)
 863                                 return(0);
 864                         break;
 865                 default:
 866                         if (*name++ != c)
 867                                 return(0);
 868                         break;
 869                 }
 870         }
 871         return(*name == EOS);
 872 }
 873
 874 /* Free allocated data belonging to a glob_t structure. */
 875 void
 876 globfree(glob_t *pglob)
 877 {
 878         int i;
 879         char **pp;
 880
 881         if (pglob->gl_pathv != NULL) {
 882                 pp = pglob->gl_pathv + pglob->gl_offs;
 883                 for (i = pglob->gl_pathc; i--; ++pp)
 884                         if (*pp)
 885                                 free(*pp);
 886                 free(pglob->gl_pathv);
 887                 pglob->gl_pathv = NULL;
 888         }
 889         if (pglob->gl_statv != NULL) {
 890                 for (i = 0; i < pglob->gl_pathc; i++) {
 891                         if (pglob->gl_statv[i] != NULL)
 892                                 free(pglob->gl_statv[i]);
 893                 }
 894                 free(pglob->gl_statv);
 895                 pglob->gl_statv = NULL;
 896         }
 897 }
 898
 899 static DIR *
 900 g_opendir(Char *str, glob_t *pglob)
 901 {
 902         char buf[MAXPATHLEN];
 903
 904         if (!*str)
 905                 strlcpy(buf, ".", sizeof buf);
 906         else {
 907                 if (g_Ctoc(str, buf, sizeof(buf)))
 908                         return(NULL);
 909         }
 910
 911         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 912                 return((*pglob->gl_opendir)(buf));
 913
 914         return(opendir(buf));
 915 }
 916
 917 static int
 918 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 919 {
 920         char buf[MAXPATHLEN];
 921
 922         if (g_Ctoc(fn, buf, sizeof(buf)))
 923                 return(-1);
 924         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 925                 return((*pglob->gl_lstat)(buf, sb));
 926         return(lstat(buf, sb));
 927 }
 928
 929 static int
 930 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 931 {
 932         char buf[MAXPATHLEN];
 933
 934         if (g_Ctoc(fn, buf, sizeof(buf)))
 935                 return(-1);
 936         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 937                 return((*pglob->gl_stat)(buf, sb));
 938         return(stat(buf, sb));
 939 }
 940
 941 static Char *
 942 g_strchr(const Char *str, int ch)
 943 {
 944         do {
 945                 if (*str == ch)
 946                         return ((Char *)str);
 947         } while (*str++);
 948         return (NULL);
 949 }
 950
 951 static int
 952 g_Ctoc(const Char *str, char *buf, u_int len)
 953 {
 954
 955         while (len--) {
 956                 if ((*buf++ = *str++) == EOS)
 957                         return (0);
 958         }
 959         return (1);
 960 }
 961
 962 #ifdef DEBUG
 963 static void
 964 qprintf(const char *str, Char *s)
 965 {
 966         Char *p;
 967
 968         (void)printf("%s:\n", str);
 969         for (p = s; *p; p++)
 970                 (void)printf("%c", CHAR(*p));
 971         (void)printf("\n");
 972         for (p = s; *p; p++)
 973                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 974         (void)printf("\n");
 975         for (p = s; *p; p++)
 976                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 977         (void)printf("\n");
 978 }
 979 #endif
 980
 981 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
 982           !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) */