1 /* $NetBSD: glob.c,v 1.20 2008/01/18 16:20:00 christos Exp $ */ 2 3 /* 4 * Copyright (c) 1989, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Guido van Rossum. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #include <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)glob.c 8.3 (Berkeley) 10/13/93"; 39 #else 40 __RCSID("$NetBSD: glob.c,v 1.20 2008/01/18 16:20:00 christos Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 /* 45 * glob(3) -- a superset of the one defined in POSIX 1003.2. 46 * 47 * The [!...] convention to negate a range is supported (SysV, Posix, ksh). 48 * 49 * Optional extra services, controlled by flags not defined by POSIX: 50 * 51 * GLOB_MAGCHAR: 52 * Set in gl_flags if pattern contained a globbing character. 53 * GLOB_NOMAGIC: 54 * Same as GLOB_NOCHECK, but it will only append pattern if it did 55 * not contain any magic characters. [Used in csh style globbing] 56 * GLOB_ALTDIRFUNC: 57 * Use alternately specified directory access functions. 58 * GLOB_TILDE: 59 * expand ~user/foo to the /home/dir/of/user/foo 60 * GLOB_BRACE: 61 * expand {1,2}{a,b} to 1a 1b 2a 2b 62 * GLOB_PERIOD: 63 * allow metacharacters to match leading dots in filenames. 64 * gl_matchc: 65 * Number of matches in the current invocation of glob. 66 */ 67 68 #include "namespace.h" 69 #include <sys/param.h> 70 #include <sys/stat.h> 71 72 #include <assert.h> 73 #include <ctype.h> 74 #include <dirent.h> 75 #include <errno.h> 76 #include <glob.h> 77 #include <pwd.h> 78 #include <stdio.h> 79 #include <stdlib.h> 80 #include <string.h> 81 #include <unistd.h> 82 83 #ifdef HAVE_NBTOOL_CONFIG_H 84 #define NO_GETPW_R 85 #endif 86 87 /* 88 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r) 89 */ 90 #ifndef _DIAGASSERT 91 #define _DIAGASSERT(a) 92 #endif 93 94 #define DOLLAR '$' 95 #define DOT '.' 96 #define EOS '\0' 97 #define LBRACKET '[' 98 #define NOT '!' 99 #define QUESTION '?' 100 #define QUOTE '\\' 101 #define RANGE '-' 102 #define RBRACKET ']' 103 #define SEP '/' 104 #define STAR '*' 105 #define TILDE '~' 106 #define UNDERSCORE '_' 107 #define LBRACE '{' 108 #define RBRACE '}' 109 #define SLASH '/' 110 #define COMMA ',' 111 112 #ifndef USE_8BIT_CHARS 113 114 #define M_QUOTE 0x8000 115 #define M_PROTECT 0x4000 116 #define M_MASK 0xffff 117 #define M_ASCII 0x00ff 118 119 typedef u_short Char; 120 121 #else 122 123 #define M_QUOTE (Char)0x80 124 #define M_PROTECT (Char)0x40 125 #define M_MASK (Char)0xff 126 #define M_ASCII (Char)0x7f 127 128 typedef char Char; 129 130 #endif 131 132 133 #define CHAR(c) ((Char)((c)&M_ASCII)) 134 #define META(c) ((Char)((c)|M_QUOTE)) 135 #define M_ALL META('*') 136 #define M_END META(']') 137 #define M_NOT META('!') 138 #define M_ONE META('?') 139 #define M_RNG META('-') 140 #define M_SET 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 *, size_t); 146 static int g_lstat(Char *, __gl_stat_t *, glob_t *); 147 static DIR *g_opendir(Char *, glob_t *); 148 static Char *g_strchr(const Char *, int); 149 static int g_stat(Char *, __gl_stat_t *, glob_t *); 150 static int glob0(const Char *, glob_t *); 151 static int glob1(Char *, glob_t *, size_t *); 152 static int glob2(Char *, Char *, Char *, Char *, glob_t *, 153 size_t *); 154 static int glob3(Char *, Char *, Char *, Char *, Char *, glob_t *, 155 size_t *); 156 static int globextend(const Char *, glob_t *, size_t *); 157 static const Char *globtilde(const Char *, Char *, size_t, glob_t *); 158 static int globexp1(const Char *, glob_t *); 159 static int globexp2(const Char *, const Char *, glob_t *, int *); 160 static int match(Char *, Char *, Char *); 161 #ifdef DEBUG 162 static void qprintf(const char *, Char *); 163 #endif 164 165 int 166 glob(const char *pattern, int flags, int (*errfunc)(const char *, int), 167 glob_t *pglob) 168 { 169 const u_char *patnext; 170 int c; 171 Char *bufnext, *bufend, patbuf[MAXPATHLEN+1]; 172 173 _DIAGASSERT(pattern != NULL); 174 175 patnext = (const u_char *) pattern; 176 if (!(flags & GLOB_APPEND)) { 177 pglob->gl_pathc = 0; 178 pglob->gl_pathv = NULL; 179 if (!(flags & GLOB_DOOFFS)) 180 pglob->gl_offs = 0; 181 } 182 pglob->gl_flags = flags & ~GLOB_MAGCHAR; 183 pglob->gl_errfunc = errfunc; 184 pglob->gl_matchc = 0; 185 186 bufnext = patbuf; 187 bufend = bufnext + MAXPATHLEN; 188 if (flags & GLOB_NOESCAPE) { 189 while (bufnext < bufend && (c = *patnext++) != EOS) 190 *bufnext++ = c; 191 } else { 192 /* Protect the quoted characters. */ 193 while (bufnext < bufend && (c = *patnext++) != EOS) 194 if (c == QUOTE) { 195 if ((c = *patnext++) == EOS) { 196 c = QUOTE; 197 --patnext; 198 } 199 *bufnext++ = c | M_PROTECT; 200 } 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 int rv; 222 223 _DIAGASSERT(pattern != NULL); 224 _DIAGASSERT(pglob != NULL); 225 226 /* Protect a single {}, for find(1), like csh */ 227 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS) 228 return glob0(pattern, pglob); 229 230 while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL) 231 if (!globexp2(ptr, pattern, pglob, &rv)) 232 return rv; 233 234 return glob0(pattern, pglob); 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, int *rv) 245 { 246 int i; 247 Char *lm, *ls; 248 const Char *pe, *pm, *pl; 249 Char patbuf[MAXPATHLEN + 1]; 250 251 _DIAGASSERT(ptr != NULL); 252 _DIAGASSERT(pattern != NULL); 253 _DIAGASSERT(pglob != NULL); 254 _DIAGASSERT(rv != NULL); 255 256 /* copy part up to the brace */ 257 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++) 258 continue; 259 ls = lm; 260 261 /* Find the balanced brace */ 262 for (i = 0, pe = ++ptr; *pe; pe++) 263 if (*pe == LBRACKET) { 264 /* Ignore everything between [] */ 265 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++) 266 continue; 267 if (*pe == EOS) { 268 /* 269 * We could not find a matching RBRACKET. 270 * Ignore and just look for RBRACE 271 */ 272 pe = pm; 273 } 274 } 275 else if (*pe == LBRACE) 276 i++; 277 else if (*pe == RBRACE) { 278 if (i == 0) 279 break; 280 i--; 281 } 282 283 /* Non matching braces; just glob the pattern */ 284 if (i != 0 || *pe == EOS) { 285 /* 286 * we use `pattern', not `patbuf' here so that that 287 * unbalanced braces are passed to the match 288 */ 289 *rv = glob0(pattern, pglob); 290 return 0; 291 } 292 293 for (i = 0, pl = pm = ptr; pm <= pe; pm++) { 294 switch (*pm) { 295 case LBRACKET: 296 /* Ignore everything between [] */ 297 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++) 298 continue; 299 if (*pm == EOS) { 300 /* 301 * We could not find a matching RBRACKET. 302 * Ignore and just look for RBRACE 303 */ 304 pm = pl; 305 } 306 break; 307 308 case LBRACE: 309 i++; 310 break; 311 312 case RBRACE: 313 if (i) { 314 i--; 315 break; 316 } 317 /* FALLTHROUGH */ 318 case COMMA: 319 if (i && *pm == COMMA) 320 break; 321 else { 322 /* Append the current string */ 323 for (lm = ls; (pl < pm); *lm++ = *pl++) 324 continue; 325 /* 326 * Append the rest of the pattern after the 327 * closing brace 328 */ 329 for (pl = pe + 1; (*lm++ = *pl++) != EOS;) 330 continue; 331 332 /* Expand the current pattern */ 333 #ifdef DEBUG 334 qprintf("globexp2:", patbuf); 335 #endif 336 *rv = globexp1(patbuf, pglob); 337 338 /* move after the comma, to the next string */ 339 pl = pm + 1; 340 } 341 break; 342 343 default: 344 break; 345 } 346 } 347 *rv = 0; 348 return 0; 349 } 350 351 352 353 /* 354 * expand tilde from the passwd file. 355 */ 356 static const Char * 357 globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob) 358 { 359 struct passwd *pwd; 360 const char *h; 361 const Char *p; 362 Char *b; 363 char *d; 364 Char *pend = &patbuf[patsize / sizeof(Char)]; 365 #ifndef NO_GETPW_R 366 struct passwd pwres; 367 char pwbuf[1024]; 368 #endif 369 370 pend--; 371 372 _DIAGASSERT(pattern != NULL); 373 _DIAGASSERT(patbuf != NULL); 374 _DIAGASSERT(pglob != NULL); 375 376 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE)) 377 return pattern; 378 379 /* Copy up to the end of the string or / */ 380 for (p = pattern + 1, d = (char *)(void *)patbuf; 381 d < (char *)(void *)pend && *p && *p != SLASH; 382 *d++ = *p++) 383 continue; 384 385 if (d == (char *)(void *)pend) 386 return NULL; 387 388 *d = EOS; 389 d = (char *)(void *)patbuf; 390 391 if (*d == EOS) { 392 /* 393 * handle a plain ~ or ~/ by expanding $HOME 394 * first and then trying the password file 395 */ 396 if ((h = getenv("HOME")) == NULL) { 397 #ifdef NO_GETPW_R 398 if ((pwd = getpwuid(getuid())) == NULL) 399 #else 400 if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf), 401 &pwd) != 0 || pwd == NULL) 402 #endif 403 return pattern; 404 else 405 h = pwd->pw_dir; 406 } 407 } 408 else { 409 /* 410 * Expand a ~user 411 */ 412 #ifdef NO_GETPW_R 413 if ((pwd = getpwnam(d)) == NULL) 414 #else 415 if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 416 pwd == NULL) 417 #endif 418 return pattern; 419 else 420 h = pwd->pw_dir; 421 } 422 423 /* Copy the home directory */ 424 for (b = patbuf; b < pend && *h; *b++ = *h++) 425 continue; 426 427 if (b == pend) 428 return NULL; 429 430 /* Append the rest of the pattern */ 431 while (b < pend && (*b++ = *p++) != EOS) 432 continue; 433 434 if (b == pend) 435 return NULL; 436 437 return patbuf; 438 } 439 440 441 /* 442 * The main glob() routine: compiles the pattern (optionally processing 443 * quotes), calls glob1() to do the real pattern matching, and finally 444 * sorts the list (unless unsorted operation is requested). Returns 0 445 * if things went well, nonzero if errors occurred. It is not an error 446 * to find no matches. 447 */ 448 static int 449 glob0(const Char *pattern, glob_t *pglob) 450 { 451 const Char *qpatnext; 452 int c, error; 453 __gl_size_t oldpathc; 454 Char *bufnext, patbuf[MAXPATHLEN+1]; 455 size_t limit = 0; 456 457 _DIAGASSERT(pattern != NULL); 458 _DIAGASSERT(pglob != NULL); 459 460 if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf), 461 pglob)) == NULL) 462 return GLOB_ABEND; 463 oldpathc = pglob->gl_pathc; 464 bufnext = patbuf; 465 466 /* We don't need to check for buffer overflow any more. */ 467 while ((c = *qpatnext++) != EOS) { 468 switch (c) { 469 case LBRACKET: 470 c = *qpatnext; 471 if (c == NOT) 472 ++qpatnext; 473 if (*qpatnext == EOS || 474 g_strchr(qpatnext+1, RBRACKET) == NULL) { 475 *bufnext++ = LBRACKET; 476 if (c == NOT) 477 --qpatnext; 478 break; 479 } 480 *bufnext++ = M_SET; 481 if (c == NOT) 482 *bufnext++ = M_NOT; 483 c = *qpatnext++; 484 do { 485 *bufnext++ = CHAR(c); 486 if (*qpatnext == RANGE && 487 (c = qpatnext[1]) != RBRACKET) { 488 *bufnext++ = M_RNG; 489 *bufnext++ = CHAR(c); 490 qpatnext += 2; 491 } 492 } while ((c = *qpatnext++) != RBRACKET); 493 pglob->gl_flags |= GLOB_MAGCHAR; 494 *bufnext++ = M_END; 495 break; 496 case QUESTION: 497 pglob->gl_flags |= GLOB_MAGCHAR; 498 *bufnext++ = M_ONE; 499 break; 500 case STAR: 501 pglob->gl_flags |= GLOB_MAGCHAR; 502 /* collapse adjacent stars to one, 503 * to avoid exponential behavior 504 */ 505 if (bufnext == patbuf || bufnext[-1] != M_ALL) 506 *bufnext++ = M_ALL; 507 break; 508 default: 509 *bufnext++ = CHAR(c); 510 break; 511 } 512 } 513 *bufnext = EOS; 514 #ifdef DEBUG 515 qprintf("glob0:", patbuf); 516 #endif 517 518 if ((error = glob1(patbuf, pglob, &limit)) != 0) 519 return error; 520 521 if (pglob->gl_pathc == oldpathc) { 522 /* 523 * If there was no match we are going to append the pattern 524 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was 525 * specified and the pattern did not contain any magic 526 * characters GLOB_NOMAGIC is there just for compatibility 527 * with csh. 528 */ 529 if ((pglob->gl_flags & GLOB_NOCHECK) || 530 ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR)) 531 == GLOB_NOMAGIC)) { 532 return globextend(pattern, pglob, &limit); 533 } else { 534 return GLOB_NOMATCH; 535 } 536 } else if (!(pglob->gl_flags & GLOB_NOSORT)) { 537 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc, 538 (size_t)pglob->gl_pathc - oldpathc, sizeof(char *), 539 compare); 540 } 541 542 return 0; 543 } 544 545 static int 546 compare(const void *p, const void *q) 547 { 548 549 _DIAGASSERT(p != NULL); 550 _DIAGASSERT(q != NULL); 551 552 return strcoll(*(const char * const *)p, *(const char * const *)q); 553 } 554 555 static int 556 glob1(Char *pattern, glob_t *pglob, size_t *limit) 557 { 558 Char pathbuf[MAXPATHLEN+1]; 559 560 _DIAGASSERT(pattern != NULL); 561 _DIAGASSERT(pglob != NULL); 562 563 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */ 564 if (*pattern == EOS) 565 return 0; 566 /* 567 * we save one character so that we can use ptr >= limit, 568 * in the general case when we are appending non nul chars only. 569 */ 570 return glob2(pathbuf, pathbuf, 571 pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern, 572 pglob, limit); 573 } 574 575 /* 576 * The functions glob2 and glob3 are mutually recursive; there is one level 577 * of recursion for each segment in the pattern that contains one or more 578 * meta characters. 579 */ 580 static int 581 glob2(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern, glob_t *pglob, 582 size_t *limit) 583 { 584 __gl_stat_t sb; 585 Char *p, *q; 586 int anymeta; 587 588 _DIAGASSERT(pathbuf != NULL); 589 _DIAGASSERT(pathend != NULL); 590 _DIAGASSERT(pattern != NULL); 591 _DIAGASSERT(pglob != NULL); 592 593 /* 594 * Loop over pattern segments until end of pattern or until 595 * segment with meta character found. 596 */ 597 for (anymeta = 0;;) { 598 if (*pattern == EOS) { /* End of pattern? */ 599 *pathend = EOS; 600 if (g_lstat(pathbuf, &sb, pglob)) 601 return 0; 602 603 if (((pglob->gl_flags & GLOB_MARK) && 604 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) || 605 (S_ISLNK(sb.st_mode) && 606 (g_stat(pathbuf, &sb, pglob) == 0) && 607 S_ISDIR(sb.st_mode)))) { 608 if (pathend >= pathlim) 609 return GLOB_ABORTED; 610 *pathend++ = SEP; 611 *pathend = EOS; 612 } 613 ++pglob->gl_matchc; 614 return globextend(pathbuf, pglob, limit); 615 } 616 617 /* Find end of next segment, copy tentatively to pathend. */ 618 q = pathend; 619 p = pattern; 620 while (*p != EOS && *p != SEP) { 621 if (ismeta(*p)) 622 anymeta = 1; 623 if (q >= pathlim) 624 return GLOB_ABORTED; 625 *q++ = *p++; 626 } 627 628 /* 629 * No expansion, or path ends in dot-slash or dot-dot-slash, 630 * do next segment. 631 */ 632 if ((!anymeta) || 633 (((pathend-pathbuf) > 1) && 634 (((*(pathend-1) == SEP) && (*(pathend-2) == DOT)) && 635 ((((pathend-pathbuf) < 3) || (*(pathend-3) == SEP)) || 636 (((pathend-pathbuf) < 4) || 637 ((*(pathend-3) == DOT) && (*(pathend-4) == SEP))))))) { 638 pathend = q; 639 pattern = p; 640 while (*pattern == SEP) { 641 if (pathend >= pathlim) 642 return GLOB_ABORTED; 643 *pathend++ = *pattern++; 644 } 645 } else /* Need expansion, recurse. */ 646 return glob3(pathbuf, pathend, pathlim, pattern, p, 647 pglob, limit); 648 } 649 /* NOTREACHED */ 650 } 651 652 static int 653 glob3(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern, 654 Char *restpattern, glob_t *pglob, size_t *limit) 655 { 656 struct dirent *dp; 657 DIR *dirp; 658 int error; 659 char buf[MAXPATHLEN]; 660 661 /* 662 * The readdirfunc declaration can't be prototyped, because it is 663 * assigned, below, to two functions which are prototyped in glob.h 664 * and dirent.h as taking pointers to differently typed opaque 665 * structures. 666 */ 667 struct dirent *(*readdirfunc)(void *); 668 669 _DIAGASSERT(pathbuf != NULL); 670 _DIAGASSERT(pathend != NULL); 671 _DIAGASSERT(pattern != NULL); 672 _DIAGASSERT(restpattern != NULL); 673 _DIAGASSERT(pglob != NULL); 674 675 *pathend = EOS; 676 errno = 0; 677 678 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) { 679 if (pglob->gl_errfunc) { 680 if (g_Ctoc(pathbuf, buf, sizeof(buf))) 681 return GLOB_ABORTED; 682 if (pglob->gl_errfunc(buf, errno) || 683 pglob->gl_flags & GLOB_ERR) 684 return GLOB_ABORTED; 685 } 686 /* 687 * Posix/XOpen: glob should return when it encounters a 688 * directory that it cannot open or read 689 * XXX: Should we ignore ENOTDIR and ENOENT though? 690 * I think that Posix had in mind EPERM... 691 */ 692 if (pglob->gl_flags & GLOB_ERR) 693 return GLOB_ABORTED; 694 695 return 0; 696 } 697 698 error = 0; 699 700 /* Search directory for matching names. */ 701 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 702 readdirfunc = pglob->gl_readdir; 703 else 704 readdirfunc = (struct dirent *(*)__P((void *))) readdir; 705 while ((dp = (*readdirfunc)(dirp)) != NULL) { 706 u_char *sc; 707 Char *dc; 708 709 /* 710 * Initial DOT must be matched literally, unless we have 711 * GLOB_PERIOD set. 712 */ 713 if ((pglob->gl_flags & GLOB_PERIOD) == 0) 714 if (dp->d_name[0] == DOT && *pattern != DOT) 715 continue; 716 /* 717 * The resulting string contains EOS, so we can 718 * use the pathlim character, if it is the nul 719 */ 720 for (sc = (u_char *) dp->d_name, dc = pathend; 721 dc <= pathlim && (*dc++ = *sc++) != EOS;) 722 continue; 723 724 /* 725 * Have we filled the buffer without seeing EOS? 726 */ 727 if (dc > pathlim && *pathlim != EOS) { 728 /* 729 * Abort when requested by caller, otherwise 730 * reset pathend back to last SEP and continue 731 * with next dir entry. 732 */ 733 if (pglob->gl_flags & GLOB_ERR) { 734 error = GLOB_ABORTED; 735 break; 736 } 737 else { 738 *pathend = EOS; 739 continue; 740 } 741 } 742 743 if (!match(pathend, pattern, restpattern)) { 744 *pathend = EOS; 745 continue; 746 } 747 error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit); 748 if (error) 749 break; 750 } 751 752 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 753 (*pglob->gl_closedir)(dirp); 754 else 755 closedir(dirp); 756 757 /* 758 * Again Posix X/Open issue with regards to error handling. 759 */ 760 if ((error || errno) && (pglob->gl_flags & GLOB_ERR)) 761 return GLOB_ABORTED; 762 763 return error; 764 } 765 766 767 /* 768 * Extend the gl_pathv member of a glob_t structure to accommodate a new item, 769 * add the new item, and update gl_pathc. 770 * 771 * This assumes the BSD realloc, which only copies the block when its size 772 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic 773 * behavior. 774 * 775 * Return 0 if new item added, error code if memory couldn't be allocated. 776 * 777 * Invariant of the glob_t structure: 778 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and 779 * gl_pathv points to (gl_offs + gl_pathc + 1) items. 780 */ 781 static int 782 globextend(const Char *path, glob_t *pglob, size_t *limit) 783 { 784 char **pathv; 785 size_t i, newsize, len; 786 char *copy; 787 const Char *p; 788 789 _DIAGASSERT(path != NULL); 790 _DIAGASSERT(pglob != NULL); 791 792 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs); 793 pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) : 794 malloc(newsize); 795 if (pathv == NULL) 796 return GLOB_NOSPACE; 797 798 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) { 799 /* first time around -- clear initial gl_offs items */ 800 pathv += pglob->gl_offs; 801 for (i = pglob->gl_offs + 1; --i > 0; ) 802 *--pathv = NULL; 803 } 804 pglob->gl_pathv = pathv; 805 806 for (p = path; *p++;) 807 continue; 808 len = (size_t)(p - path); 809 *limit += len; 810 if ((copy = malloc(len)) != NULL) { 811 if (g_Ctoc(path, copy, len)) { 812 free(copy); 813 return GLOB_ABORTED; 814 } 815 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy; 816 } 817 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL; 818 819 if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) { 820 errno = 0; 821 return GLOB_NOSPACE; 822 } 823 824 return copy == NULL ? GLOB_NOSPACE : 0; 825 } 826 827 828 /* 829 * pattern matching function for filenames. Each occurrence of the * 830 * pattern causes a recursion level. 831 */ 832 static int 833 match(Char *name, Char *pat, Char *patend) 834 { 835 int ok, negate_range; 836 Char c, k; 837 838 _DIAGASSERT(name != NULL); 839 _DIAGASSERT(pat != NULL); 840 _DIAGASSERT(patend != NULL); 841 842 while (pat < patend) { 843 c = *pat++; 844 switch (c & M_MASK) { 845 case M_ALL: 846 if (pat == patend) 847 return 1; 848 do 849 if (match(name, pat, patend)) 850 return 1; 851 while (*name++ != EOS); 852 return 0; 853 case M_ONE: 854 if (*name++ == EOS) 855 return 0; 856 break; 857 case M_SET: 858 ok = 0; 859 if ((k = *name++) == EOS) 860 return 0; 861 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS) 862 ++pat; 863 while (((c = *pat++) & M_MASK) != M_END) 864 if ((*pat & M_MASK) == M_RNG) { 865 if (c <= k && k <= pat[1]) 866 ok = 1; 867 pat += 2; 868 } else if (c == k) 869 ok = 1; 870 if (ok == negate_range) 871 return 0; 872 break; 873 default: 874 if (*name++ != c) 875 return 0; 876 break; 877 } 878 } 879 return *name == EOS; 880 } 881 882 /* Free allocated data belonging to a glob_t structure. */ 883 void 884 globfree(glob_t *pglob) 885 { 886 size_t i; 887 char **pp; 888 889 _DIAGASSERT(pglob != NULL); 890 891 if (pglob->gl_pathv != NULL) { 892 pp = pglob->gl_pathv + pglob->gl_offs; 893 for (i = pglob->gl_pathc; i--; ++pp) 894 if (*pp) 895 free(*pp); 896 free(pglob->gl_pathv); 897 pglob->gl_pathv = NULL; 898 pglob->gl_pathc = 0; 899 } 900 } 901 902 static DIR * 903 g_opendir(Char *str, glob_t *pglob) 904 { 905 char buf[MAXPATHLEN]; 906 907 _DIAGASSERT(str != NULL); 908 _DIAGASSERT(pglob != NULL); 909 910 if (!*str) 911 (void)strlcpy(buf, ".", sizeof(buf)); 912 else { 913 if (g_Ctoc(str, buf, sizeof(buf))) 914 return NULL; 915 } 916 917 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 918 return (*pglob->gl_opendir)(buf); 919 920 return opendir(buf); 921 } 922 923 static int 924 g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob) 925 { 926 char buf[MAXPATHLEN]; 927 928 _DIAGASSERT(fn != NULL); 929 _DIAGASSERT(sb != NULL); 930 _DIAGASSERT(pglob != NULL); 931 932 if (g_Ctoc(fn, buf, sizeof(buf))) 933 return -1; 934 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 935 return (*pglob->gl_lstat)(buf, sb); 936 return lstat(buf, sb); 937 } 938 939 static int 940 g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob) 941 { 942 char buf[MAXPATHLEN]; 943 944 _DIAGASSERT(fn != NULL); 945 _DIAGASSERT(sb != NULL); 946 _DIAGASSERT(pglob != NULL); 947 948 if (g_Ctoc(fn, buf, sizeof(buf))) 949 return -1; 950 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 951 return (*pglob->gl_stat)(buf, sb); 952 return stat(buf, sb); 953 } 954 955 static Char * 956 g_strchr(const Char *str, int ch) 957 { 958 959 _DIAGASSERT(str != NULL); 960 961 do { 962 if (*str == ch) 963 return __UNCONST(str); 964 } while (*str++); 965 return NULL; 966 } 967 968 static int 969 g_Ctoc(const Char *str, char *buf, size_t len) 970 { 971 char *dc; 972 973 _DIAGASSERT(str != NULL); 974 _DIAGASSERT(buf != NULL); 975 976 if (len == 0) 977 return 1; 978 979 for (dc = buf; len && (*dc++ = *str++) != EOS; len--) 980 continue; 981 982 return len == 0; 983 } 984 985 #ifdef DEBUG 986 static void 987 qprintf(const char *str, Char *s) 988 { 989 Char *p; 990 991 _DIAGASSERT(str != NULL); 992 _DIAGASSERT(s != NULL); 993 994 (void)printf("%s:\n", str); 995 for (p = s; *p; p++) 996 (void)printf("%c", CHAR(*p)); 997 (void)printf("\n"); 998 for (p = s; *p; p++) 999 (void)printf("%c", *p & M_PROTECT ? '"' : ' '); 1000 (void)printf("\n"); 1001 for (p = s; *p; p++) 1002 (void)printf("%c", ismeta(*p) ? '_' : ' '); 1003 (void)printf("\n"); 1004 } 1005 #endif 1006