openbsd-compat/glob.c

   1 /*      $OpenBSD: glob.c,v 1.35 2011/01/12 01:53:14 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 #include "charclass.h"
  80
  81 #define DOLLAR          '$'
  82 #define DOT             '.'
  83 #define EOS             '\0'
  84 #define LBRACKET        '['
  85 #define NOT             '!'
  86 #define QUESTION        '?'
  87 #define QUOTE           '\\'
  88 #define RANGE           '-'
  89 #define RBRACKET        ']'
  90 #define SEP             '/'
  91 #define STAR            '*'
  92 #define TILDE           '~'
  93 #define UNDERSCORE      '_'
  94 #define LBRACE          '{'
  95 #define RBRACE          '}'
  96 #define SLASH           '/'
  97 #define COMMA           ','
  98
  99 #ifndef DEBUG
 100
 101 #define M_QUOTE         0x8000
 102 #define M_PROTECT       0x4000
 103 #define M_MASK          0xffff
 104 #define M_ASCII         0x00ff
 105
 106 typedef u_short Char;
 107
 108 #else
 109
 110 #define M_QUOTE         0x80
 111 #define M_PROTECT       0x40
 112 #define M_MASK          0xff
 113 #define M_ASCII         0x7f
 114
 115 typedef char Char;
 116
 117 #endif
 118
 119
 120 #define CHAR(c)         ((Char)((c)&M_ASCII))
 121 #define META(c)         ((Char)((c)|M_QUOTE))
 122 #define M_ALL           META('*')
 123 #define M_END           META(']')
 124 #define M_NOT           META('!')
 125 #define M_ONE           META('?')
 126 #define M_RNG           META('-')
 127 #define M_SET           META('[')
 128 #define M_CLASS         META(':')
 129 #define ismeta(c)       (((c)&M_QUOTE) != 0)
 130
 131 #define GLOB_LIMIT_MALLOC       65536
 132 #define GLOB_LIMIT_STAT         128
 133 #define GLOB_LIMIT_READDIR      16384
 134
 135 struct glob_lim {
 136         size_t  glim_malloc;
 137         size_t  glim_stat;
 138         size_t  glim_readdir;
 139 };
 140
 141 static int       compare(const void *, const void *);
 142 static int       g_Ctoc(const Char *, char *, u_int);
 143 static int       g_lstat(Char *, struct stat *, glob_t *);
 144 static DIR      *g_opendir(Char *, glob_t *);
 145 static Char     *g_strchr(const Char *, int);
 146 static int       g_strncmp(const Char *, const char *, size_t);
 147 static int       g_stat(Char *, struct stat *, glob_t *);
 148 static int       glob0(const Char *, glob_t *, struct glob_lim *);
 149 static int       glob1(Char *, Char *, glob_t *, struct glob_lim *);
 150 static int       glob2(Char *, Char *, Char *, Char *, Char *, Char *,
 151                     glob_t *, struct glob_lim *);
 152 static int       glob3(Char *, Char *, Char *, Char *, Char *,
 153                     Char *, Char *, glob_t *, struct glob_lim *);
 154 static int       globextend(const Char *, glob_t *, struct glob_lim *,
 155                     struct stat *);
 156 static const Char *
 157                  globtilde(const Char *, Char *, size_t, glob_t *);
 158 static int       globexp1(const Char *, glob_t *, struct glob_lim *);
 159 static int       globexp2(const Char *, const Char *, glob_t *,
 160                     struct glob_lim *);
 161 static int       match(Char *, Char *, Char *);
 162 #ifdef DEBUG
 163 static void      qprintf(const char *, Char *);
 164 #endif
 165
 166 int
 167 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
 168     glob_t *pglob)
 169 {
 170         const u_char *patnext;
 171         int c;
 172         Char *bufnext, *bufend, patbuf[MAXPATHLEN];
 173         struct glob_lim limit = { 0, 0, 0 };
 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         if (pglob->gl_offs < 0 || pglob->gl_pathc < 0 ||
 188             pglob->gl_offs >= INT_MAX || pglob->gl_pathc >= INT_MAX ||
 189             pglob->gl_pathc >= INT_MAX - pglob->gl_offs - 1)
 190                 return GLOB_NOSPACE;
 191
 192         bufnext = patbuf;
 193         bufend = bufnext + MAXPATHLEN - 1;
 194         if (flags & GLOB_NOESCAPE)
 195                 while (bufnext < bufend && (c = *patnext++) != EOS)
 196                         *bufnext++ = c;
 197         else {
 198                 /* Protect the quoted characters. */
 199                 while (bufnext < bufend && (c = *patnext++) != EOS)
 200                         if (c == QUOTE) {
 201                                 if ((c = *patnext++) == EOS) {
 202                                         c = QUOTE;
 203                                         --patnext;
 204                                 }
 205                                 *bufnext++ = c | M_PROTECT;
 206                         } else
 207                                 *bufnext++ = c;
 208         }
 209         *bufnext = EOS;
 210
 211         if (flags & GLOB_BRACE)
 212                 return globexp1(patbuf, pglob, &limit);
 213         else
 214                 return glob0(patbuf, pglob, &limit);
 215 }
 216
 217 /*
 218  * Expand recursively a glob {} pattern. When there is no more expansion
 219  * invoke the standard globbing routine to glob the rest of the magic
 220  * characters
 221  */
 222 static int
 223 globexp1(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
 224 {
 225         const Char* ptr = pattern;
 226
 227         /* Protect a single {}, for find(1), like csh */
 228         if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
 229                 return glob0(pattern, pglob, limitp);
 230
 231         if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
 232                 return globexp2(ptr, pattern, pglob, limitp);
 233
 234         return glob0(pattern, pglob, limitp);
 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(const Char *ptr, const Char *pattern, glob_t *pglob,
 245     struct glob_lim *limitp)
 246 {
 247         int     i, rv;
 248         Char   *lm, *ls;
 249         const Char *pe, *pm, *pl;
 250         Char    patbuf[MAXPATHLEN];
 251
 252         /* copy part up to the brace */
 253         for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
 254                 ;
 255         *lm = EOS;
 256         ls = lm;
 257
 258         /* Find the balanced brace */
 259         for (i = 0, pe = ++ptr; *pe; pe++)
 260                 if (*pe == LBRACKET) {
 261                         /* Ignore everything between [] */
 262                         for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
 263                                 ;
 264                         if (*pe == EOS) {
 265                                 /*
 266                                  * We could not find a matching RBRACKET.
 267                                  * Ignore and just look for RBRACE
 268                                  */
 269                                 pe = pm;
 270                         }
 271                 } else if (*pe == LBRACE)
 272                         i++;
 273                 else if (*pe == RBRACE) {
 274                         if (i == 0)
 275                                 break;
 276                         i--;
 277                 }
 278
 279         /* Non matching braces; just glob the pattern */
 280         if (i != 0 || *pe == EOS)
 281                 return glob0(patbuf, pglob, limitp);
 282
 283         for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
 284                 switch (*pm) {
 285                 case LBRACKET:
 286                         /* Ignore everything between [] */
 287                         for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
 288                                 ;
 289                         if (*pm == EOS) {
 290                                 /*
 291                                  * We could not find a matching RBRACKET.
 292                                  * Ignore and just look for RBRACE
 293                                  */
 294                                 pm = pl;
 295                         }
 296                         break;
 297
 298                 case LBRACE:
 299                         i++;
 300                         break;
 301
 302                 case RBRACE:
 303                         if (i) {
 304                                 i--;
 305                                 break;
 306                         }
 307                         /* FALLTHROUGH */
 308                 case COMMA:
 309                         if (i && *pm == COMMA)
 310                                 break;
 311                         else {
 312                                 /* Append the current string */
 313                                 for (lm = ls; (pl < pm); *lm++ = *pl++)
 314                                         ;
 315
 316                                 /*
 317                                  * Append the rest of the pattern after the
 318                                  * closing brace
 319                                  */
 320                                 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
 321                                         ;
 322
 323                                 /* Expand the current pattern */
 324 #ifdef DEBUG
 325                                 qprintf("globexp2:", patbuf);
 326 #endif
 327                                 rv = globexp1(patbuf, pglob, limitp);
 328                                 if (rv && rv != GLOB_NOMATCH)
 329                                         return rv;
 330
 331                                 /* move after the comma, to the next string */
 332                                 pl = pm + 1;
 333                         }
 334                         break;
 335
 336                 default:
 337                         break;
 338                 }
 339         }
 340         return 0;
 341 }
 342
 343
 344
 345 /*
 346  * expand tilde from the passwd file.
 347  */
 348 static const Char *
 349 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
 350 {
 351         struct passwd *pwd;
 352         char *h;
 353         const Char *p;
 354         Char *b, *eb;
 355
 356         if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
 357                 return pattern;
 358
 359         /* Copy up to the end of the string or / */
 360         eb = &patbuf[patbuf_len - 1];
 361         for (p = pattern + 1, h = (char *) patbuf;
 362             h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
 363                 ;
 364
 365         *h = EOS;
 366
 367 #if 0
 368         if (h == (char *)eb)
 369                 return what;
 370 #endif
 371
 372         if (((char *) patbuf)[0] == EOS) {
 373                 /*
 374                  * handle a plain ~ or ~/ by expanding $HOME
 375                  * first and then trying the password file
 376                  */
 377 #if 0
 378                 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
 379 #endif
 380                 if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
 381                         if ((pwd = getpwuid(getuid())) == NULL)
 382                                 return pattern;
 383                         else
 384                                 h = pwd->pw_dir;
 385                 }
 386         } else {
 387                 /*
 388                  * Expand a ~user
 389                  */
 390                 if ((pwd = getpwnam((char*) patbuf)) == NULL)
 391                         return pattern;
 392                 else
 393                         h = pwd->pw_dir;
 394         }
 395
 396         /* Copy the home directory */
 397         for (b = patbuf; b < eb && *h; *b++ = *h++)
 398                 ;
 399
 400         /* Append the rest of the pattern */
 401         while (b < eb && (*b++ = *p++) != EOS)
 402                 ;
 403         *b = EOS;
 404
 405         return patbuf;
 406 }
 407
 408 static int
 409 g_strncmp(const Char *s1, const char *s2, size_t n)
 410 {
 411         int rv = 0;
 412
 413         while (n--) {
 414                 rv = *(Char *)s1 - *(const unsigned char *)s2++;
 415                 if (rv)
 416                         break;
 417                 if (*s1++ == '\0')
 418                         break;
 419         }
 420         return rv;
 421 }
 422
 423 static int
 424 g_charclass(const Char **patternp, Char **bufnextp)
 425 {
 426         const Char *pattern = *patternp + 1;
 427         Char *bufnext = *bufnextp;
 428         const Char *colon;
 429         struct cclass *cc;
 430         size_t len;
 431
 432         if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
 433                 return 1;       /* not a character class */
 434
 435         len = (size_t)(colon - pattern);
 436         for (cc = cclasses; cc->name != NULL; cc++) {
 437                 if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
 438                         break;
 439         }
 440         if (cc->name == NULL)
 441                 return -1;      /* invalid character class */
 442         *bufnext++ = M_CLASS;
 443         *bufnext++ = (Char)(cc - &cclasses[0]);
 444         *bufnextp = bufnext;
 445         *patternp += len + 3;
 446
 447         return 0;
 448 }
 449
 450 /*
 451  * The main glob() routine: compiles the pattern (optionally processing
 452  * quotes), calls glob1() to do the real pattern matching, and finally
 453  * sorts the list (unless unsorted operation is requested).  Returns 0
 454  * if things went well, nonzero if errors occurred.  It is not an error
 455  * to find no matches.
 456  */
 457 static int
 458 glob0(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
 459 {
 460         const Char *qpatnext;
 461         int c, err, oldpathc;
 462         Char *bufnext, patbuf[MAXPATHLEN];
 463
 464         qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
 465         oldpathc = pglob->gl_pathc;
 466         bufnext = patbuf;
 467
 468         /* We don't need to check for buffer overflow any more. */
 469         while ((c = *qpatnext++) != EOS) {
 470                 switch (c) {
 471                 case LBRACKET:
 472                         c = *qpatnext;
 473                         if (c == NOT)
 474                                 ++qpatnext;
 475                         if (*qpatnext == EOS ||
 476                             g_strchr(qpatnext+1, RBRACKET) == NULL) {
 477                                 *bufnext++ = LBRACKET;
 478                                 if (c == NOT)
 479                                         --qpatnext;
 480                                 break;
 481                         }
 482                         *bufnext++ = M_SET;
 483                         if (c == NOT)
 484                                 *bufnext++ = M_NOT;
 485                         c = *qpatnext++;
 486                         do {
 487                                 if (c == LBRACKET && *qpatnext == ':') {
 488                                         do {
 489                                                 err = g_charclass(&qpatnext,
 490                                                     &bufnext);
 491                                                 if (err)
 492                                                         break;
 493                                                 c = *qpatnext++;
 494                                         } while (c == LBRACKET && *qpatnext == ':');
 495                                         if (err == -1 &&
 496                                             !(pglob->gl_flags & GLOB_NOCHECK))
 497                                                 return GLOB_NOMATCH;
 498                                         if (c == RBRACKET)
 499                                                 break;
 500                                 }
 501                                 *bufnext++ = CHAR(c);
 502                                 if (*qpatnext == RANGE &&
 503                                     (c = qpatnext[1]) != RBRACKET) {
 504                                         *bufnext++ = M_RNG;
 505                                         *bufnext++ = CHAR(c);
 506                                         qpatnext += 2;
 507                                 }
 508                         } while ((c = *qpatnext++) != RBRACKET);
 509                         pglob->gl_flags |= GLOB_MAGCHAR;
 510                         *bufnext++ = M_END;
 511                         break;
 512                 case QUESTION:
 513                         pglob->gl_flags |= GLOB_MAGCHAR;
 514                         *bufnext++ = M_ONE;
 515                         break;
 516                 case STAR:
 517                         pglob->gl_flags |= GLOB_MAGCHAR;
 518                         /* collapse adjacent stars to one,
 519                          * to avoid exponential behavior
 520                          */
 521                         if (bufnext == patbuf || bufnext[-1] != M_ALL)
 522                                 *bufnext++ = M_ALL;
 523                         break;
 524                 default:
 525                         *bufnext++ = CHAR(c);
 526                         break;
 527                 }
 528         }
 529         *bufnext = EOS;
 530 #ifdef DEBUG
 531         qprintf("glob0:", patbuf);
 532 #endif
 533
 534         if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, limitp)) != 0)
 535                 return(err);
 536
 537         /*
 538          * If there was no match we are going to append the pattern
 539          * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
 540          * and the pattern did not contain any magic characters
 541          * GLOB_NOMAGIC is there just for compatibility with csh.
 542          */
 543         if (pglob->gl_pathc == oldpathc) {
 544                 if ((pglob->gl_flags & GLOB_NOCHECK) ||
 545                     ((pglob->gl_flags & GLOB_NOMAGIC) &&
 546                     !(pglob->gl_flags & GLOB_MAGCHAR)))
 547                         return(globextend(pattern, pglob, limitp, NULL));
 548                 else
 549                         return(GLOB_NOMATCH);
 550         }
 551         if (!(pglob->gl_flags & GLOB_NOSORT))
 552                 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
 553                     pglob->gl_pathc - oldpathc, sizeof(char *), compare);
 554         return(0);
 555 }
 556
 557 static int
 558 compare(const void *p, const void *q)
 559 {
 560         return(strcmp(*(char **)p, *(char **)q));
 561 }
 562
 563 static int
 564 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
 565 {
 566         Char pathbuf[MAXPATHLEN];
 567
 568         /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
 569         if (*pattern == EOS)
 570                 return(0);
 571         return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
 572             pathbuf, pathbuf+MAXPATHLEN-1,
 573             pattern, pattern_last, pglob, limitp));
 574 }
 575
 576 /*
 577  * The functions glob2 and glob3 are mutually recursive; there is one level
 578  * of recursion for each segment in the pattern that contains one or more
 579  * meta characters.
 580  */
 581 static int
 582 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 583     Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
 584 {
 585         struct stat sb;
 586         Char *p, *q;
 587         int anymeta;
 588
 589         /*
 590          * Loop over pattern segments until end of pattern or until
 591          * segment with meta character found.
 592          */
 593         for (anymeta = 0;;) {
 594                 if (*pattern == EOS) {          /* End of pattern? */
 595                         *pathend = EOS;
 596                         if (g_lstat(pathbuf, &sb, pglob))
 597                                 return(0);
 598
 599                         if ((pglob->gl_flags & GLOB_LIMIT) &&
 600                             limitp->glim_stat++ >= GLOB_LIMIT_STAT) {
 601                                 errno = 0;
 602                                 *pathend++ = SEP;
 603                                 *pathend = EOS;
 604                                 return(GLOB_NOSPACE);
 605                         }
 606
 607                         if (((pglob->gl_flags & GLOB_MARK) &&
 608                             pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
 609                             (S_ISLNK(sb.st_mode) &&
 610                             (g_stat(pathbuf, &sb, pglob) == 0) &&
 611                             S_ISDIR(sb.st_mode)))) {
 612                                 if (pathend+1 > pathend_last)
 613                                         return (1);
 614                                 *pathend++ = SEP;
 615                                 *pathend = EOS;
 616                         }
 617                         ++pglob->gl_matchc;
 618                         return(globextend(pathbuf, pglob, limitp, &sb));
 619                 }
 620
 621                 /* Find end of next segment, copy tentatively to pathend. */
 622                 q = pathend;
 623                 p = pattern;
 624                 while (*p != EOS && *p != SEP) {
 625                         if (ismeta(*p))
 626                                 anymeta = 1;
 627                         if (q+1 > pathend_last)
 628                                 return (1);
 629                         *q++ = *p++;
 630                 }
 631
 632                 if (!anymeta) {         /* No expansion, do next segment. */
 633                         pathend = q;
 634                         pattern = p;
 635                         while (*pattern == SEP) {
 636                                 if (pathend+1 > pathend_last)
 637                                         return (1);
 638                                 *pathend++ = *pattern++;
 639                         }
 640                 } else
 641                         /* Need expansion, recurse. */
 642                         return(glob3(pathbuf, pathbuf_last, pathend,
 643                             pathend_last, pattern, p, pattern_last,
 644                             pglob, limitp));
 645         }
 646         /* NOTREACHED */
 647 }
 648
 649 static int
 650 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
 651     Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
 652     struct glob_lim *limitp)
 653 {
 654         struct dirent *dp;
 655         DIR *dirp;
 656         int err;
 657         char buf[MAXPATHLEN];
 658
 659         /*
 660          * The readdirfunc declaration can't be prototyped, because it is
 661          * assigned, below, to two functions which are prototyped in glob.h
 662          * and dirent.h as taking pointers to differently typed opaque
 663          * structures.
 664          */
 665         struct dirent *(*readdirfunc)(void *);
 666
 667         if (pathend > pathend_last)
 668                 return (1);
 669         *pathend = EOS;
 670         errno = 0;
 671
 672         if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
 673                 /* TODO: don't call for ENOENT or ENOTDIR? */
 674                 if (pglob->gl_errfunc) {
 675                         if (g_Ctoc(pathbuf, buf, sizeof(buf)))
 676                                 return(GLOB_ABORTED);
 677                         if (pglob->gl_errfunc(buf, errno) ||
 678                             pglob->gl_flags & GLOB_ERR)
 679                                 return(GLOB_ABORTED);
 680                 }
 681                 return(0);
 682         }
 683
 684         err = 0;
 685
 686         /* Search directory for matching names. */
 687         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 688                 readdirfunc = pglob->gl_readdir;
 689         else
 690                 readdirfunc = (struct dirent *(*)(void *))readdir;
 691         while ((dp = (*readdirfunc)(dirp))) {
 692                 u_char *sc;
 693                 Char *dc;
 694
 695                 if ((pglob->gl_flags & GLOB_LIMIT) &&
 696                     limitp->glim_readdir++ >= GLOB_LIMIT_READDIR) {
 697                         errno = 0;
 698                         *pathend++ = SEP;
 699                         *pathend = EOS;
 700                         return(GLOB_NOSPACE);
 701                 }
 702
 703                 /* Initial DOT must be matched literally. */
 704                 if (dp->d_name[0] == DOT && *pattern != DOT)
 705                         continue;
 706                 dc = pathend;
 707                 sc = (u_char *) dp->d_name;
 708                 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
 709                         ;
 710                 if (dc >= pathend_last) {
 711                         *dc = EOS;
 712                         err = 1;
 713                         break;
 714                 }
 715
 716                 if (!match(pathend, pattern, restpattern)) {
 717                         *pathend = EOS;
 718                         continue;
 719                 }
 720                 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
 721                     restpattern, restpattern_last, pglob, limitp);
 722                 if (err)
 723                         break;
 724         }
 725
 726         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 727                 (*pglob->gl_closedir)(dirp);
 728         else
 729                 closedir(dirp);
 730         return(err);
 731 }
 732
 733
 734 /*
 735  * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
 736  * add the new item, and update gl_pathc.
 737  *
 738  * This assumes the BSD realloc, which only copies the block when its size
 739  * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
 740  * behavior.
 741  *
 742  * Return 0 if new item added, error code if memory couldn't be allocated.
 743  *
 744  * Invariant of the glob_t structure:
 745  *      Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
 746  *      gl_pathv points to (gl_offs + gl_pathc + 1) items.
 747  */
 748 static int
 749 globextend(const Char *path, glob_t *pglob, struct glob_lim *limitp,
 750     struct stat *sb)
 751 {
 752         char **pathv;
 753         ssize_t i;
 754         size_t newn, len;
 755         char *copy = NULL;
 756         const Char *p;
 757         struct stat **statv;
 758
 759         newn = 2 + pglob->gl_pathc + pglob->gl_offs;
 760         if (pglob->gl_offs >= INT_MAX ||
 761             pglob->gl_pathc >= INT_MAX ||
 762             newn >= INT_MAX ||
 763             SIZE_MAX / sizeof(*pathv) <= newn ||
 764             SIZE_MAX / sizeof(*statv) <= newn) {
 765  nospace:
 766                 for (i = pglob->gl_offs; i < (ssize_t)(newn - 2); i++) {
 767                         if (pglob->gl_pathv && pglob->gl_pathv[i])
 768                                 free(pglob->gl_pathv[i]);
 769                         if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
 770                             pglob->gl_pathv && pglob->gl_pathv[i])
 771                                 free(pglob->gl_statv[i]);
 772                 }
 773                 if (pglob->gl_pathv) {
 774                         free(pglob->gl_pathv);
 775                         pglob->gl_pathv = NULL;
 776                 }
 777                 if (pglob->gl_statv) {
 778                         free(pglob->gl_statv);
 779                         pglob->gl_statv = NULL;
 780                 }
 781                 return(GLOB_NOSPACE);
 782         }
 783
 784         pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
 785         if (pathv == NULL)
 786                 goto nospace;
 787         if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
 788                 /* first time around -- clear initial gl_offs items */
 789                 pathv += pglob->gl_offs;
 790                 for (i = pglob->gl_offs; --i >= 0; )
 791                         *--pathv = NULL;
 792         }
 793         pglob->gl_pathv = pathv;
 794
 795         if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
 796                 statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
 797                 if (statv == NULL)
 798                         goto nospace;
 799                 if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
 800                         /* first time around -- clear initial gl_offs items */
 801                         statv += pglob->gl_offs;
 802                         for (i = pglob->gl_offs; --i >= 0; )
 803                                 *--statv = NULL;
 804                 }
 805                 pglob->gl_statv = statv;
 806                 if (sb == NULL)
 807                         statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 808                 else {
 809                         limitp->glim_malloc += sizeof(**statv);
 810                         if ((pglob->gl_flags & GLOB_LIMIT) &&
 811                             limitp->glim_malloc >= GLOB_LIMIT_MALLOC) {
 812                                 errno = 0;
 813                                 return(GLOB_NOSPACE);
 814                         }
 815                         if ((statv[pglob->gl_offs + pglob->gl_pathc] =
 816                             malloc(sizeof(**statv))) == NULL)
 817                                 goto copy_error;
 818                         memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
 819                             sizeof(*sb));
 820                 }
 821                 statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
 822         }
 823
 824         for (p = path; *p++;)
 825                 ;
 826         len = (size_t)(p - path);
 827         limitp->glim_malloc += len;
 828         if ((copy = malloc(len)) != NULL) {
 829                 if (g_Ctoc(path, copy, len)) {
 830                         free(copy);
 831                         return(GLOB_NOSPACE);
 832                 }
 833                 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
 834         }
 835         pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
 836
 837         if ((pglob->gl_flags & GLOB_LIMIT) &&
 838             (newn * sizeof(*pathv)) + limitp->glim_malloc >
 839             GLOB_LIMIT_MALLOC) {
 840                 errno = 0;
 841                 return(GLOB_NOSPACE);
 842         }
 843  copy_error:
 844         return(copy == NULL ? GLOB_NOSPACE : 0);
 845 }
 846
 847
 848 /*
 849  * pattern matching function for filenames.  Each occurrence of the *
 850  * pattern causes a recursion level.
 851  */
 852 static int
 853 match(Char *name, Char *pat, Char *patend)
 854 {
 855         int ok, negate_range;
 856         Char c, k;
 857
 858         while (pat < patend) {
 859                 c = *pat++;
 860                 switch (c & M_MASK) {
 861                 case M_ALL:
 862                         if (pat == patend)
 863                                 return(1);
 864                         do {
 865                             if (match(name, pat, patend))
 866                                     return(1);
 867                         } while (*name++ != EOS);
 868                         return(0);
 869                 case M_ONE:
 870                         if (*name++ == EOS)
 871                                 return(0);
 872                         break;
 873                 case M_SET:
 874                         ok = 0;
 875                         if ((k = *name++) == EOS)
 876                                 return(0);
 877                         if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
 878                                 ++pat;
 879                         while (((c = *pat++) & M_MASK) != M_END) {
 880                                 if ((c & M_MASK) == M_CLASS) {
 881                                         Char idx = *pat & M_MASK;
 882                                         if (idx < NCCLASSES &&
 883                                             cclasses[idx].isctype(k))
 884                                                 ok = 1;
 885                                         ++pat;
 886                                 }
 887                                 if ((*pat & M_MASK) == M_RNG) {
 888                                         if (c <= k && k <= pat[1])
 889                                                 ok = 1;
 890                                         pat += 2;
 891                                 } else if (c == k)
 892                                         ok = 1;
 893                         }
 894                         if (ok == negate_range)
 895                                 return(0);
 896                         break;
 897                 default:
 898                         if (*name++ != c)
 899                                 return(0);
 900                         break;
 901                 }
 902         }
 903         return(*name == EOS);
 904 }
 905
 906 /* Free allocated data belonging to a glob_t structure. */
 907 void
 908 globfree(glob_t *pglob)
 909 {
 910         int i;
 911         char **pp;
 912
 913         if (pglob->gl_pathv != NULL) {
 914                 pp = pglob->gl_pathv + pglob->gl_offs;
 915                 for (i = pglob->gl_pathc; i--; ++pp)
 916                         if (*pp)
 917                                 free(*pp);
 918                 free(pglob->gl_pathv);
 919                 pglob->gl_pathv = NULL;
 920         }
 921         if (pglob->gl_statv != NULL) {
 922                 for (i = 0; i < pglob->gl_pathc; i++) {
 923                         if (pglob->gl_statv[i] != NULL)
 924                                 free(pglob->gl_statv[i]);
 925                 }
 926                 free(pglob->gl_statv);
 927                 pglob->gl_statv = NULL;
 928         }
 929 }
 930
 931 static DIR *
 932 g_opendir(Char *str, glob_t *pglob)
 933 {
 934         char buf[MAXPATHLEN];
 935
 936         if (!*str)
 937                 strlcpy(buf, ".", sizeof buf);
 938         else {
 939                 if (g_Ctoc(str, buf, sizeof(buf)))
 940                         return(NULL);
 941         }
 942
 943         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 944                 return((*pglob->gl_opendir)(buf));
 945
 946         return(opendir(buf));
 947 }
 948
 949 static int
 950 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
 951 {
 952         char buf[MAXPATHLEN];
 953
 954         if (g_Ctoc(fn, buf, sizeof(buf)))
 955                 return(-1);
 956         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 957                 return((*pglob->gl_lstat)(buf, sb));
 958         return(lstat(buf, sb));
 959 }
 960
 961 static int
 962 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
 963 {
 964         char buf[MAXPATHLEN];
 965
 966         if (g_Ctoc(fn, buf, sizeof(buf)))
 967                 return(-1);
 968         if (pglob->gl_flags & GLOB_ALTDIRFUNC)
 969                 return((*pglob->gl_stat)(buf, sb));
 970         return(stat(buf, sb));
 971 }
 972
 973 static Char *
 974 g_strchr(const Char *str, int ch)
 975 {
 976         do {
 977                 if (*str == ch)
 978                         return ((Char *)str);
 979         } while (*str++);
 980         return (NULL);
 981 }
 982
 983 static int
 984 g_Ctoc(const Char *str, char *buf, u_int len)
 985 {
 986
 987         while (len--) {
 988                 if ((*buf++ = *str++) == EOS)
 989                         return (0);
 990         }
 991         return (1);
 992 }
 993
 994 #ifdef DEBUG
 995 static void
 996 qprintf(const char *str, Char *s)
 997 {
 998         Char *p;
 999
1000         (void)printf("%s:\n", str);
1001         for (p = s; *p; p++)
1002                 (void)printf("%c", CHAR(*p));
1003         (void)printf("\n");
1004         for (p = s; *p; p++)
1005                 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1006         (void)printf("\n");
1007         for (p = s; *p; p++)
1008                 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1009         (void)printf("\n");
1010 }
1011 #endif
1012
1013 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
1014           !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) */