openbsd-compat/glob.c

   1 /*      $OpenBSD: glob.c,v 1.25 2005/08/08 08:05:34 espie 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 #include "includes.h"
  37
  38 #include <sys/types.h>
  39 #include <sys/stat.h>
  40 #include <dirent.h>
  41 #include <ctype.h>
  42 #include <errno.h>
  43 #include <pwd.h>
  44 #include <string.h>
  45 #include <unistd.h>
  46
  47 static long
  48 get_arg_max(void)
  49 {
  50 #ifdef ARG_MAX
  51         return(ARG_MAX);
  52 #elif defined(HAVE_SYSCONF) && defined(_SC_ARG_MAX)
  53         return(sysconf(_SC_ARG_MAX));
  54 #else
  55         return(256); /* XXX: arbitrary */
  56 #endif
  57 }
  58
  59 #if !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) || \
  60     !defined(GLOB_HAS_GL_MATCHC)
  61
  62 /*
  63  * glob(3) -- a superset of the one defined in POSIX 1003.2.
  64  *
  65  * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
  66  *
  67  * Optional extra services, controlled by flags not defined by POSIX:
  68  *
  69  * GLOB_QUOTE:
  70  *      Escaping convention: \ inhibits any special meaning the following
  71  *      character might have (except \ at end of string is retained).
  72  * GLOB_MAGCHAR:
  73  *      Set in gl_flags if pattern contained a globbing character.
  74  * GLOB_NOMAGIC:
  75  *      Same as GLOB_NOCHECK, but it will only append pattern if it did
  76  *      not contain any magic characters.  [Used in csh style globbing]
  77  * GLOB_ALTDIRFUNC:
  78  *      Use alternately specified directory access functions.
  79  * GLOB_TILDE:
  80  *      expand ~user/foo to the /home/dir/of/user/foo
  81  * GLOB_BRACE:
  82  *      expand {1,2}{a,b} to 1a 1b 2a 2b
  83  * gl_matchc:
  84  *      Number of matches in the current invocation of glob.
  85  */
  86
  87
  88 #define DOLLAR          '$'
  89 #define DOT             '.'
  90 #define EOS             '\0'
  91 #define LBRACKET        '['
  92 #define NOT             '!'
  93 #define QUESTION        '?'
  94 #define QUOTE           '\\'
  95 #define RANGE           '-'
  96 #define RBRACKET        ']'
  97 #define SEP             '/'
  98 #define STAR            '*'
  99 #undef TILDE                    /* Some platforms may already define it */
 100 #define TILDE           '~'
 101 #define UNDERSCORE      '_'
 102 #define LBRACE          '{'
 103 #define RBRACE          '}'
 104 #define SLASH           '/'
 105 #define COMMA           ','
 106
 107 #ifndef DEBUG
 108
 109 #define M_QUOTE         0x8000
 110 #define M_PROTECT       0x4000
 111 #define M_MASK          0xffff
 112 #define M_ASCII         0x00ff
 113
 114 typedef u_short Char;
 115
 116 #else
 117
 118 #define M_QUOTE         0x80
 119 #define M_PROTECT       0x40
 120 #define M_MASK          0xff
 121 #define M_ASCII         0x7f
 122
 123 typedef char Char;
 124
 125 #endif
 126
 127
 128 #define CHAR(c)         ((Char)((c)&M_ASCII))
 129 #define META(c)         ((Char)((c)|M_QUOTE))
 130 #define M_ALL           META('*')
 131 #define M_END           META(']')
 132 #define M_NOT           META('!')
 133 #define M_ONE           META('?')
 134 #define M_RNG           META('-')
 135 #define M_SET           META('[')
 136 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 137
 138
 139 static int       compare(const void *, const void *);
 140 static int       g_Ctoc(const Char *, char *, u_int);
 141 static int       g_lstat(Char *, struct stat *, glob_t *);
 142 static DIR      *g_opendir(Char *, glob_t *);
 143 static Char     *g_strchr(Char *, int);
 144 static int       g_stat(Char *, struct stat *, glob_t *);
 145 static int       glob0(const Char *, glob_t *);
 146 static int       glob1(Char *, Char *, glob_t *, size_t *);
 147 static int       glob2(Char *, Char *, Char *, Char *, Char *, Char *,
 148                     glob_t *, size_t *);
 149 static int       glob3(Char *, Char *, Char *, Char *, Char *, Char *,
 150                     Char *, Char *, glob_t *, size_t *);
 151 static int       globextend(const Char *, glob_t *, size_t *);
 152 static const Char *
 153                  globtilde(const Char *, Char *, size_t, glob_t *);
 154 static int       globexp1(const Char *, glob_t *);
 155 static int       globexp2(const Char *, const Char *, glob_t *, int *);
 156 static int       match(Char *, Char *, Char *);
 157 #ifdef DEBUG
 158 static void      qprintf(const char *, Char *);
 159 #endif
 160
 161 int
 162 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
 163     glob_t *pglob)
 164 {
 165         const u_char *patnext;
 166         int c;
 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         pglob->gl_flags = flags & ~GLOB_MAGCHAR;
 177         pglob->gl_errfunc = errfunc;
 178         pglob->gl_matchc = 0;
 179
 180         bufnext = patbuf;
 181         bufend = bufnext + MAXPATHLEN - 1;
 182         if (flags & GLOB_NOESCAPE)
 183                 while (bufnext < bufend && (c = *patnext++) != EOS)
 184                         *bufnext++ = c;
 185         else {
 186                 /* Protect the quoted characters. */
 187                 while (bufnext < bufend && (c = *patnext++) != EOS)
 188                         if (c == QUOTE) {
 189                                 if ((c = *patnext++) == EOS) {
 190                                         c = QUOTE;
 191                                         --patnext;
 192                                 }
 193                                 *bufnext++ = c | M_PROTECT;
 194                         } else
 195                                 *bufnext++ = c;
 196         }
 197         *bufnext = EOS;
 198
 199         if (flags & GLOB_BRACE)
 200                 return globexp1(patbuf, pglob);
 201         else
 202                 return glob0(patbuf, pglob);
 203 }
 204
 205 /*
 206  * Expand recursively a glob {} pattern. When there is no more expansion
 207  * invoke the standard globbing routine to glob the rest of the magic
 208  * characters
 209  */
 210 static int
 211 globexp1(const Char *pattern, glob_t *pglob)
 212 {
 213         const Char* ptr = pattern;
 214         int rv;
 215
 216         /* Protect a single {}, for find(1), like csh */
 217         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 218                 return glob0(pattern, pglob);
 219
 220         while ((ptr = (const Char *) g_strchr((Char *) ptr, LBRACE)) != NULL)
 221                 if (!globexp2(ptr, pattern, pglob, &rv))
 222                         return rv;
 223
 224         return glob0(pattern, pglob);
 225 }
 226
 227
 228 /*
 229  * Recursive brace globbing helper. Tries to expand a single brace.
 230  * If it succeeds then it invokes globexp1 with the new pattern.
 231  * If it fails then it tries to glob the rest of the pattern and returns.
 232  */
 233 static int
 234 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
 235 {
 236         int     i;
 237         Char   *lm, *ls;
 238         const Char *pe, *pm, *pl;
 239         Char    patbuf[MAXPATHLEN];
 240
 241         /* copy part up to the brace */
 242         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 243                 ;
 244         *lm = EOS;
 245         ls = lm;
 246
 247         /* Find the balanced brace */
 248         for (i = 0, pe = ++ptr; *pe; pe++)
 249                 if (*pe == LBRACKET) {
 250                         /* Ignore everything between [] */
 251                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 252                                 ;
 253                         if (*pe == EOS) {
 254                                 /*
 255                                  * We could not find a matching RBRACKET.
 256                                  * Ignore and just look for RBRACE
 257                                  */
 258                                 pe = pm;
 259                         }
 260                 } else if (*pe == LBRACE)
 261                         i++;
 262                 else if (*pe == RBRACE) {
 263                         if (i == 0)
 264                                 break;
 265                         i--;
 266                 }
 267
 268         /* Non matching braces; just glob the pattern */
 269         if (i != 0 || *pe == EOS) {
 270                 *rv = glob0(patbuf, pglob);
 271                 return 0;
 272         }
 273
 274         for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
 275                 switch (*pm) {
 276                 case LBRACKET:
 277                         /* Ignore everything between [] */
 278                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 279                                 ;
 280                         if (*pm == EOS) {
 281                                 /*
 282                                  * We could not find a matching RBRACKET.
 283                                  * Ignore and just look for RBRACE
 284                                  */
 285                                 pm = pl;
 286                         }
 287                         break;
 288
 289                 case LBRACE:
 290                         i++;
 291                         break;
 292
 293                 case RBRACE:
 294                         if (i) {
 295                                 i--;
 296                                 break;
 297                         }
 298                         /* FALLTHROUGH */
 299                 case COMMA:
 300                         if (i && *pm == COMMA)
 301                                 break;
 302                         else {
 303                                 /* Append the current string */
 304                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 305                                         ;
 306
 307                                 /*
 308                                  * Append the rest of the pattern after the
 309                                  * closing brace
 310                                  */
 311                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
 312                                         ;
 313
 314                                 /* Expand the current pattern */
 315 #ifdef DEBUG
 316                                 qprintf("globexp2:", patbuf);
 317 #endif
 318                                 *rv = globexp1(patbuf, pglob);
 319
 320                                 /* move after the comma, to the next string */
 321                                 pl = pm + 1;
 322                         }
 323                         break;
 324
 325                 default:
 326                         break;
 327                 }
 328         }
 329         *rv = 0;
 330         return 0;
 331 }
 332
 333
 334
 335 /*
 336  * expand tilde from the passwd file.
 337  */
 338 static const Char *
 339 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 340 {
 341         struct passwd *pwd;
 342         char *h;
 343         const Char *p;
 344         Char *b, *eb;
 345
 346         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 347                 return pattern;
 348
 349         /* Copy up to the end of the string or / */
 350         eb = &patbuf[patbuf_len - 1];
 351         for (p = pattern + 1, h = (char *) patbuf;
 352             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 353                 ;
 354
 355         *h = EOS;
 356
 357 #if 0
 358         if (h == (char *)eb)
 359                 return what;
 360 #endif
 361
 362         if (((char *) patbuf)[0] == EOS) {
 363                 /*
 364                  * handle a plain ~ or ~/ by expanding $HOME
 365                  * first and then trying the password file
 366                  */
 367 #if 0
 368                 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
 369 #endif
 370                 if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
 371                         if ((pwd = getpwuid(getuid())) == NULL)
 372                                 return pattern;
 373                         else
 374                                 h = pwd->pw_dir;
 375                 }
 376         } else {
 377                 /*
 378                  * Expand a ~user
 379                  */
 380                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 381                         return pattern;
 382                 else
 383                         h = pwd->pw_dir;
 384         }
 385
 386         /* Copy the home directory */
 387         for (b = patbuf; b < eb && *h; *b++ = *h++)
 388                 ;
 389
 390         /* Append the rest of the pattern */
 391         while (b < eb && (*b++ = *p++) != EOS)
 392                 ;
 393         *b = EOS;
 394
 395         return patbuf;
 396 }
 397
 398
 399 /*
 400  * The main glob() routine: compiles the pattern (optionally processing
 401  * quotes), calls glob1() to do the real pattern matching, and finally
 402  * sorts the list (unless unsorted operation is requested).  Returns 0
 403  * if things went well, nonzero if errors occurred.  It is not an error
 404  * to find no matches.
 405  */
 406 static int
 407 glob0(const Char *pattern, glob_t *pglob)
 408 {
 409         const Char *qpatnext;
 410         int c, err, oldpathc;
 411         Char *bufnext, patbuf[MAXPATHLEN];
 412         size_t limit = 0;
 413
 414         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 415         oldpathc = pglob->gl_pathc;
 416         bufnext = patbuf;
 417
 418         /* We don't need to check for buffer overflow any more. */
 419         while ((c = *qpatnext++) != EOS) {
 420                 switch (c) {
 421                 case LBRACKET:
 422                         c = *qpatnext;
 423                         if (c == NOT)
 424                                 ++qpatnext;
 425                         if (*qpatnext == EOS ||
 426                             g_strchr((Char *) qpatnext+1, RBRACKET) == NULL) {
 427                                 *bufnext++ = LBRACKET;
 428                                 if (c == NOT)
 429                                         --qpatnext;
 430                                 break;
 431                         }
 432                         *bufnext++ = M_SET;
 433                         if (c == NOT)
 434                                 *bufnext++ = M_NOT;
 435                         c = *qpatnext++;
 436                         do {
 437                                 *bufnext++ = CHAR(c);
 438                                 if (*qpatnext == RANGE &&
 439                                     (c = qpatnext[1]) != RBRACKET) {
 440                                         *bufnext++ = M_RNG;
 441                                         *bufnext++ = CHAR(c);
 442                                         qpatnext += 2;
 443                                 }
 444                         } while ((c = *qpatnext++) != RBRACKET);
 445                         pglob->gl_flags |= GLOB_MAGCHAR;
 446                         *bufnext++ = M_END;
 447                         break;
 448                 case QUESTION:
 449                         pglob->gl_flags |= GLOB_MAGCHAR;
 450                         *bufnext++ = M_ONE;
 451                         break;
 452                 case STAR:
 453                         pglob->gl_flags |= GLOB_MAGCHAR;
 454                         /* collapse adjacent stars to one,
 455                          * to avoid exponential behavior
 456                          */
 457                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 458                                 *bufnext++ = M_ALL;
 459                         break;
 460                 default:
 461                         *bufnext++ = CHAR(c);
 462                         break;
 463                 }
 464         }
 465         *bufnext = EOS;
 466 #ifdef DEBUG
 467         qprintf("glob0:", patbuf);
 468 #endif
 469
 470         if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, &limit)) != 0)
 471                 return(err);
 472
 473         /*
 474          * If there was no match we are going to append the pattern
 475          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 476          * and the pattern did not contain any magic characters
 477          * GLOB_NOMAGIC is there just for compatibility with csh.
 478          */
 479         if (pglob->gl_pathc == oldpathc) {
 480                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 481                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 482                     !(pglob->gl_flags & GLOB_MAGCHAR)))
 483                         return(globextend(pattern, pglob, &limit));
 484                 else
 485                         return(GLOB_NOMATCH);
 486         }
 487         if (!(pglob->gl_flags & GLOB_NOSORT))
 488                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 489                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 490         return(0);
 491 }
 492
 493 static int
 494 compare(const void *p, const void *q)
 495 {
 496         return(strcmp(*(char **)p, *(char **)q));
 497 }
 498
 499 static int
 500 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 501 {
 502         Char pathbuf[MAXPATHLEN];
 503
 504         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 505         if (*pattern == EOS)
 506                 return(0);
 507         return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
 508             pathbuf, pathbuf+MAXPATHLEN-1,
 509             pattern, pattern_last, pglob, limitp));
 510 }
 511
 512 /*
 513  * The functions glob2 and glob3 are mutually recursive; there is one level
 514  * of recursion for each segment in the pattern that contains one or more
 515  * meta characters.
 516  */
 517 static int
 518 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 519     Char *pattern, Char *pattern_last, glob_t *pglob, size_t *limitp)
 520 {
 521         struct stat sb;
 522         Char *p, *q;
 523         int anymeta;
 524
 525         /*
 526          * Loop over pattern segments until end of pattern or until
 527          * segment with meta character found.
 528          */
 529         for (anymeta = 0;;) {
 530                 if (*pattern == EOS) {          /* End of pattern? */
 531                         *pathend = EOS;
 532                         if (g_lstat(pathbuf, &sb, pglob))
 533                                 return(0);
 534
 535                         if (((pglob->gl_flags & GLOB_MARK) &&
 536                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
 537                             (S_ISLNK(sb.st_mode) &&
 538                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 539                             S_ISDIR(sb.st_mode)))) {
 540                                 if (pathend+1 > pathend_last)
 541                                         return (1);
 542                                 *pathend++ = SEP;
 543                                 *pathend = EOS;
 544                         }
 545                         ++pglob->gl_matchc;
 546                         return(globextend(pathbuf, pglob, limitp));
 547                 }
 548
 549                 /* Find end of next segment, copy tentatively to pathend. */
 550                 q = pathend;
 551                 p = pattern;
 552                 while (*p != EOS && *p != SEP) {
 553                         if (ismeta(*p))
 554                                 anymeta = 1;
 555                         if (q+1 > pathend_last)
 556                                 return (1);
 557                         *q++ = *p++;
 558                 }
 559
 560                 if (!anymeta) {         /* No expansion, do next segment. */
 561                         pathend = q;
 562                         pattern = p;
 563                         while (*pattern == SEP) {
 564                                 if (pathend+1 > pathend_last)
 565                                         return (1);
 566                                 *pathend++ = *pattern++;
 567                         }
 568                 } else
 569                         /* Need expansion, recurse. */
 570                         return(glob3(pathbuf, pathbuf_last, pathend,
 571                             pathend_last, pattern, pattern_last,
 572                             p, pattern_last, pglob, limitp));
 573         }
 574         /* NOTREACHED */
 575 }
 576
 577 static int
 578 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 579     Char *pattern, Char *pattern_last, Char *restpattern,
 580     Char *restpattern_last, glob_t *pglob, size_t *limitp)
 581 {
 582         struct dirent *dp;
 583         DIR *dirp;
 584         int err;
 585         char buf[MAXPATHLEN];
 586
 587         /*
 588          * The readdirfunc declaration can't be prototyped, because it is
 589          * assigned, below, to two functions which are prototyped in glob.h
 590          * and dirent.h as taking pointers to differently typed opaque
 591          * structures.
 592          */
 593         struct dirent *(*readdirfunc)(void *);
 594
 595         if (pathend > pathend_last)
 596                 return (1);
 597         *pathend = EOS;
 598         errno = 0;
 599
 600         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 601                 /* TODO: don't call for ENOENT or ENOTDIR? */
 602                 if (pglob->gl_errfunc) {
 603                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 604                                 return(GLOB_ABORTED);
 605                         if (pglob->gl_errfunc(buf, errno) ||
 606                             pglob->gl_flags & GLOB_ERR)
 607                                 return(GLOB_ABORTED);
 608                 }
 609                 return(0);
 610         }
 611
 612         err = 0;
 613
 614         /* Search directory for matching names. */
 615         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 616                 readdirfunc = pglob->gl_readdir;
 617         else
 618                 readdirfunc = (struct dirent *(*)(void *))readdir;
 619         while ((dp = (*readdirfunc)(dirp))) {
 620                 u_char *sc;
 621                 Char *dc;
 622
 623                 /* Initial DOT must be matched literally. */
 624                 if (dp->d_name[0] == DOT && *pattern != DOT)
 625                         continue;
 626                 dc = pathend;
 627                 sc = (u_char *) dp->d_name;
 628                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 629                         ;
 630                 if (dc >= pathend_last) {
 631                         *dc = EOS;
 632                         err = 1;
 633                         break;
 634                 }
 635
 636                 if (!match(pathend, pattern, restpattern)) {
 637                         *pathend = EOS;
 638                         continue;
 639                 }
 640                 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
 641                     restpattern, restpattern_last, pglob, limitp);
 642                 if (err)
 643                         break;
 644         }
 645
 646         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 647                 (*pglob->gl_closedir)(dirp);
 648         else
 649                 closedir(dirp);
 650         return(err);
 651 }
 652
 653
 654 /*
 655  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 656  * add the new item, and update gl_pathc.
 657  *
 658  * This assumes the BSD realloc, which only copies the block when its size
 659  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 660  * behavior.
 661  *
 662  * Return 0 if new item added, error code if memory couldn't be allocated.
 663  *
 664  * Invariant of the glob_t structure:
 665  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 666  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 667  */
 668 static int
 669 globextend(const Char *path, glob_t *pglob, size_t *limitp)
 670 {
 671         char **pathv;
 672         int i;
 673         u_int newsize, len;
 674         char *copy;
 675         const Char *p;
 676
 677         newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
 678         pathv = pglob->gl_pathv ? realloc((char *)pglob->gl_pathv, newsize) :
 679             malloc(newsize);
 680         if (pathv == NULL) {
 681                 if (pglob->gl_pathv) {
 682                         free(pglob->gl_pathv);
 683                         pglob->gl_pathv = NULL;
 684                 }
 685                 return(GLOB_NOSPACE);
 686         }
 687
 688         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 689                 /* first time around -- clear initial gl_offs items */
 690                 pathv += pglob->gl_offs;
 691                 for (i = pglob->gl_offs; --i >= 0; )
 692                         *--pathv = NULL;
 693         }
 694         pglob->gl_pathv = pathv;
 695
 696         for (p = path; *p++;)
 697                 ;
 698         len = (size_t)(p - path);
 699         *limitp += len;
 700         if ((copy = malloc(len)) != NULL) {
 701                 if (g_Ctoc(path, copy, len)) {
 702                         free(copy);
 703                         return(GLOB_NOSPACE);
 704                 }
 705                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 706         }
 707         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 708
 709         if ((pglob->gl_flags & GLOB_LIMIT) &&
 710             newsize + *limitp >= (u_int) get_arg_max()) {
 711                 errno = 0;
 712                 return(GLOB_NOSPACE);
 713         }
 714
 715         return(copy == NULL ? GLOB_NOSPACE : 0);
 716 }
 717
 718
 719 /*
 720  * pattern matching function for filenames.  Each occurrence of the *
 721  * pattern causes a recursion level.
 722  */
 723 static int
 724 match(Char *name, Char *pat, Char *patend)
 725 {
 726         int ok, negate_range;
 727         Char c, k;
 728
 729         while (pat < patend) {
 730                 c = *pat++;
 731                 switch (c & M_MASK) {
 732                 case M_ALL:
 733                         if (pat == patend)
 734                                 return(1);
 735                         do {
 736                             if (match(name, pat, patend))
 737                                     return(1);
 738                         } while (*name++ != EOS);
 739                         return(0);
 740                 case M_ONE:
 741                         if (*name++ == EOS)
 742                                 return(0);
 743                         break;
 744                 case M_SET:
 745                         ok = 0;
 746                         if ((k = *name++) == EOS)
 747                                 return(0);
 748                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 749                                 ++pat;
 750                         while (((c = *pat++) & M_MASK) != M_END)
 751                                 if ((*pat & M_MASK) == M_RNG) {
 752                                         if (c <= k && k <= pat[1])
 753                                                 ok = 1;
 754                                         pat += 2;
 755                                 } else if (c == k)
 756                                         ok = 1;
 757                         if (ok == negate_range)
 758                                 return(0);
 759                         break;
 760                 default:
 761                         if (*name++ != c)
 762                                 return(0);
 763                         break;
 764                 }
 765         }
 766         return(*name == EOS);
 767 }
 768
 769 /* Free allocated data belonging to a glob_t structure. */
 770 void
 771 globfree(glob_t *pglob)
 772 {
 773         int i;
 774         char **pp;
 775
 776         if (pglob->gl_pathv != NULL) {
 777                 pp = pglob->gl_pathv + pglob->gl_offs;
 778                 for (i = pglob->gl_pathc; i--; ++pp)
 779                         if (*pp)
 780                                 free(*pp);
 781                 free(pglob->gl_pathv);
 782                 pglob->gl_pathv = NULL;
 783         }
 784 }
 785
 786 static DIR *
 787 g_opendir(Char *str, glob_t *pglob)
 788 {
 789         char buf[MAXPATHLEN];
 790
 791         if (!*str)
 792                 strlcpy(buf, ".", sizeof buf);
 793         else {
 794                 if (g_Ctoc(str, buf, sizeof(buf)))
 795                         return(NULL);
 796         }
 797
 798         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 799                 return((*pglob->gl_opendir)(buf));
 800
 801         return(opendir(buf));
 802 }
 803
 804 static int
 805 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 806 {
 807         char buf[MAXPATHLEN];
 808
 809         if (g_Ctoc(fn, buf, sizeof(buf)))
 810                 return(-1);
 811         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 812                 return((*pglob->gl_lstat)(buf, sb));
 813         return(lstat(buf, sb));
 814 }
 815
 816 static int
 817 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 818 {
 819         char buf[MAXPATHLEN];
 820
 821         if (g_Ctoc(fn, buf, sizeof(buf)))
 822                 return(-1);
 823         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 824                 return((*pglob->gl_stat)(buf, sb));
 825         return(stat(buf, sb));
 826 }
 827
 828 static Char *
 829 g_strchr(Char *str, int ch)
 830 {
 831         do {
 832                 if (*str == ch)
 833                         return (str);
 834         } while (*str++);
 835         return (NULL);
 836 }
 837
 838 static int
 839 g_Ctoc(const Char *str, char *buf, u_int len)
 840 {
 841
 842         while (len--) {
 843                 if ((*buf++ = *str++) == EOS)
 844                         return (0);
 845         }
 846         return (1);
 847 }
 848
 849 #ifdef DEBUG
 850 static void
 851 qprintf(const char *str, Char *s)
 852 {
 853         Char *p;
 854
 855         (void)printf("%s:\n", str);
 856         for (p = s; *p; p++)
 857                 (void)printf("%c", CHAR(*p));
 858         (void)printf("\n");
 859         for (p = s; *p; p++)
 860                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
 861         (void)printf("\n");
 862         for (p = s; *p; p++)
 863                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
 864         (void)printf("\n");
 865 }
 866 #endif
 867
 868 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
 869           !defined(GLOB_HAS_GL_MATCHC) */
 870