glob.c revision 1.12
1 /* $NetBSD: glob.c,v 1.12 2005/09/13 01:44:09 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 1.12 2005/09/13 01:44:09 christos Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 /* 45 * glob(3) -- a superset of the one defined in POSIX 1003.2. 46 * 47 * The [!...] convention to negate a range is supported (SysV, Posix, ksh). 48 * 49 * Optional extra services, controlled by flags not defined by POSIX: 50 * 51 * GLOB_MAGCHAR: 52 * Set in gl_flags if pattern contained a globbing character. 53 * GLOB_NOMAGIC: 54 * Same as GLOB_NOCHECK, but it will only append pattern if it did 55 * not contain any magic characters. [Used in csh style globbing] 56 * GLOB_ALTDIRFUNC: 57 * Use alternately specified directory access functions. 58 * GLOB_TILDE: 59 * expand ~user/foo to the /home/dir/of/user/foo 60 * GLOB_BRACE: 61 * expand {1,2}{a,b} to 1a 1b 2a 2b 62 * gl_matchc: 63 * Number of matches in the current invocation of glob. 64 */ 65 66 #include "namespace.h" 67 #include <sys/param.h> 68 #include <sys/stat.h> 69 70 #include <assert.h> 71 #include <ctype.h> 72 #include <dirent.h> 73 #include <errno.h> 74 #include <glob.h> 75 #include <pwd.h> 76 #include <stdio.h> 77 #include <stdlib.h> 78 #include <string.h> 79 #include <unistd.h> 80 81 #ifdef HAVE_NBTOOL_CONFIG_H 82 #define NO_GETPW_R 83 #endif 84 85 /* 86 * XXX: For NetBSD 1.4.x compatibility. (kill me l8r) 87 */ 88 #ifndef _DIAGASSERT 89 #define _DIAGASSERT(a) 90 #endif 91 92 #define DOLLAR '$' 93 #define DOT '.' 94 #define EOS '\0' 95 #define LBRACKET '[' 96 #define NOT '!' 97 #define QUESTION '?' 98 #define QUOTE '\\' 99 #define RANGE '-' 100 #define RBRACKET ']' 101 #define SEP '/' 102 #define STAR '*' 103 #define TILDE '~' 104 #define UNDERSCORE '_' 105 #define LBRACE '{' 106 #define RBRACE '}' 107 #define SLASH '/' 108 #define COMMA ',' 109 110 #ifndef DEBUG 111 112 #define M_QUOTE 0x8000 113 #define M_PROTECT 0x4000 114 #define M_MASK 0xffff 115 #define M_ASCII 0x00ff 116 117 typedef u_short Char; 118 119 #else 120 121 #define M_QUOTE 0x80 122 #define M_PROTECT 0x40 123 #define M_MASK 0xff 124 #define M_ASCII 0x7f 125 126 typedef char Char; 127 128 #endif 129 130 131 #define CHAR(c) ((Char)((c)&M_ASCII)) 132 #define META(c) ((Char)((c)|M_QUOTE)) 133 #define M_ALL META('*') 134 #define M_END META(']') 135 #define M_NOT META('!') 136 #define M_ONE META('?') 137 #define M_RNG META('-') 138 #define M_SET META('[') 139 #define ismeta(c) (((c)&M_QUOTE) != 0) 140 141 142 static int compare __P((const void *, const void *)); 143 static int g_Ctoc __P((const Char *, char *, size_t)); 144 static int g_lstat __P((Char *, __gl_stat_t *, glob_t *)); 145 static DIR *g_opendir __P((Char *, glob_t *)); 146 static Char *g_strchr __P((const Char *, int)); 147 static int g_stat __P((Char *, __gl_stat_t *, glob_t *)); 148 static int glob0 __P((const Char *, glob_t *)); 149 static int glob1 __P((Char *, glob_t *, size_t *)); 150 static int glob2 __P((Char *, Char *, Char *, Char *, glob_t *, 151 size_t *)); 152 static int glob3 __P((Char *, Char *, Char *, Char *, Char *, glob_t *, 153 size_t *)); 154 static int globextend __P((const Char *, glob_t *, size_t *)); 155 static const Char *globtilde __P((const Char *, Char *, size_t, glob_t *)); 156 static int globexp1 __P((const Char *, glob_t *)); 157 static int globexp2 __P((const Char *, const Char *, glob_t *, int *)); 158 static int match __P((Char *, Char *, Char *)); 159 #ifdef DEBUG 160 static void qprintf __P((const char *, Char *)); 161 #endif 162 163 int 164 glob(pattern, flags, errfunc, pglob) 165 const char *pattern; 166 int flags, (*errfunc) __P((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(pattern, pglob) 219 const Char *pattern; 220 glob_t *pglob; 221 { 222 const Char* ptr = pattern; 223 int rv; 224 225 _DIAGASSERT(pattern != NULL); 226 _DIAGASSERT(pglob != NULL); 227 228 /* Protect a single {}, for find(1), like csh */ 229 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS) 230 return glob0(pattern, pglob); 231 232 while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL) 233 if (!globexp2(ptr, pattern, pglob, &rv)) 234 return rv; 235 236 return glob0(pattern, pglob); 237 } 238 239 240 /* 241 * Recursive brace globbing helper. Tries to expand a single brace. 242 * If it succeeds then it invokes globexp1 with the new pattern. 243 * If it fails then it tries to glob the rest of the pattern and returns. 244 */ 245 static int 246 globexp2(ptr, pattern, pglob, rv) 247 const Char *ptr, *pattern; 248 glob_t *pglob; 249 int *rv; 250 { 251 int i; 252 Char *lm, *ls; 253 const Char *pe, *pm, *pl; 254 Char patbuf[MAXPATHLEN + 1]; 255 256 _DIAGASSERT(ptr != NULL); 257 _DIAGASSERT(pattern != NULL); 258 _DIAGASSERT(pglob != NULL); 259 _DIAGASSERT(rv != NULL); 260 261 /* copy part up to the brace */ 262 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++) 263 continue; 264 ls = lm; 265 266 /* Find the balanced brace */ 267 for (i = 0, pe = ++ptr; *pe; pe++) 268 if (*pe == LBRACKET) { 269 /* Ignore everything between [] */ 270 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++) 271 continue; 272 if (*pe == EOS) { 273 /* 274 * We could not find a matching RBRACKET. 275 * Ignore and just look for RBRACE 276 */ 277 pe = pm; 278 } 279 } 280 else if (*pe == LBRACE) 281 i++; 282 else if (*pe == RBRACE) { 283 if (i == 0) 284 break; 285 i--; 286 } 287 288 /* Non matching braces; just glob the pattern */ 289 if (i != 0 || *pe == EOS) { 290 /* 291 * we use `pattern', not `patbuf' here so that that 292 * unbalanced braces are passed to the match 293 */ 294 *rv = glob0(pattern, pglob); 295 return 0; 296 } 297 298 for (i = 0, pl = pm = ptr; pm <= pe; pm++) { 299 switch (*pm) { 300 case LBRACKET: 301 /* Ignore everything between [] */ 302 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++) 303 continue; 304 if (*pm == EOS) { 305 /* 306 * We could not find a matching RBRACKET. 307 * Ignore and just look for RBRACE 308 */ 309 pm = pl; 310 } 311 break; 312 313 case LBRACE: 314 i++; 315 break; 316 317 case RBRACE: 318 if (i) { 319 i--; 320 break; 321 } 322 /* FALLTHROUGH */ 323 case COMMA: 324 if (i && *pm == COMMA) 325 break; 326 else { 327 /* Append the current string */ 328 for (lm = ls; (pl < pm); *lm++ = *pl++) 329 continue; 330 /* 331 * Append the rest of the pattern after the 332 * closing brace 333 */ 334 for (pl = pe + 1; (*lm++ = *pl++) != EOS;) 335 continue; 336 337 /* Expand the current pattern */ 338 #ifdef DEBUG 339 qprintf("globexp2:", patbuf); 340 #endif 341 *rv = globexp1(patbuf, pglob); 342 343 /* move after the comma, to the next string */ 344 pl = pm + 1; 345 } 346 break; 347 348 default: 349 break; 350 } 351 } 352 *rv = 0; 353 return 0; 354 } 355 356 357 358 /* 359 * expand tilde from the passwd file. 360 */ 361 static const Char * 362 globtilde(pattern, patbuf, patsize, pglob) 363 const Char *pattern; 364 Char *patbuf; 365 size_t patsize; 366 glob_t *pglob; 367 { 368 struct passwd *pwd; 369 const char *h; 370 const Char *p; 371 Char *b; 372 char *d; 373 Char *pend = &patbuf[patsize / sizeof(Char)]; 374 #ifndef NO_GETPW_R 375 struct passwd pwres; 376 char pwbuf[1024]; 377 #endif 378 379 pend--; 380 381 _DIAGASSERT(pattern != NULL); 382 _DIAGASSERT(patbuf != NULL); 383 _DIAGASSERT(pglob != NULL); 384 385 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE)) 386 return pattern; 387 388 /* Copy up to the end of the string or / */ 389 for (p = pattern + 1, d = (char *)(void *)patbuf; 390 d < (char *)(void *)pend && *p && *p != SLASH; 391 *d++ = *p++) 392 continue; 393 394 if (d == (char *)(void *)pend) 395 return NULL; 396 397 *d = EOS; 398 d = (char *)(void *)patbuf; 399 400 if (*d == EOS) { 401 /* 402 * handle a plain ~ or ~/ by expanding $HOME 403 * first and then trying the password file 404 */ 405 if ((h = getenv("HOME")) == NULL) { 406 #ifdef NO_GETPW_R 407 if ((pwd = getpwuid(getuid())) == NULL) 408 #else 409 if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf), 410 &pwd) != 0 || pwd == NULL) 411 #endif 412 return pattern; 413 else 414 h = pwd->pw_dir; 415 } 416 } 417 else { 418 /* 419 * Expand a ~user 420 */ 421 #ifdef NO_GETPW_R 422 if ((pwd = getpwnam(d)) == NULL) 423 #else 424 if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 || 425 pwd == NULL) 426 #endif 427 return pattern; 428 else 429 h = pwd->pw_dir; 430 } 431 432 /* Copy the home directory */ 433 for (b = patbuf; b < pend && *h; *b++ = *h++) 434 continue; 435 436 if (b == pend) 437 return NULL; 438 439 /* Append the rest of the pattern */ 440 while (b < pend && (*b++ = *p++) != EOS) 441 continue; 442 443 if (b == pend) 444 return NULL; 445 446 return patbuf; 447 } 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(pattern, pglob) 459 const Char *pattern; 460 glob_t *pglob; 461 { 462 const Char *qpatnext; 463 int c, error, oldpathc; 464 Char *bufnext, patbuf[MAXPATHLEN+1]; 465 size_t limit = 0; 466 467 _DIAGASSERT(pattern != NULL); 468 _DIAGASSERT(pglob != NULL); 469 470 if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf), 471 pglob)) == NULL) 472 return GLOB_ABEND; 473 oldpathc = pglob->gl_pathc; 474 bufnext = patbuf; 475 476 /* We don't need to check for buffer overflow any more. */ 477 while ((c = *qpatnext++) != EOS) { 478 switch (c) { 479 case LBRACKET: 480 c = *qpatnext; 481 if (c == NOT) 482 ++qpatnext; 483 if (*qpatnext == EOS || 484 g_strchr(qpatnext+1, RBRACKET) == NULL) { 485 *bufnext++ = LBRACKET; 486 if (c == NOT) 487 --qpatnext; 488 break; 489 } 490 *bufnext++ = M_SET; 491 if (c == NOT) 492 *bufnext++ = M_NOT; 493 c = *qpatnext++; 494 do { 495 *bufnext++ = CHAR(c); 496 if (*qpatnext == RANGE && 497 (c = qpatnext[1]) != RBRACKET) { 498 *bufnext++ = M_RNG; 499 *bufnext++ = CHAR(c); 500 qpatnext += 2; 501 } 502 } while ((c = *qpatnext++) != RBRACKET); 503 pglob->gl_flags |= GLOB_MAGCHAR; 504 *bufnext++ = M_END; 505 break; 506 case QUESTION: 507 pglob->gl_flags |= GLOB_MAGCHAR; 508 *bufnext++ = M_ONE; 509 break; 510 case STAR: 511 pglob->gl_flags |= GLOB_MAGCHAR; 512 /* collapse adjacent stars to one, 513 * to avoid exponential behavior 514 */ 515 if (bufnext == patbuf || bufnext[-1] != M_ALL) 516 *bufnext++ = M_ALL; 517 break; 518 default: 519 *bufnext++ = CHAR(c); 520 break; 521 } 522 } 523 *bufnext = EOS; 524 #ifdef DEBUG 525 qprintf("glob0:", patbuf); 526 #endif 527 528 if ((error = glob1(patbuf, pglob, &limit)) != 0) 529 return(error); 530 531 if (pglob->gl_pathc == oldpathc) { 532 /* 533 * If there was no match we are going to append the pattern 534 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was 535 * specified and the pattern did not contain any magic 536 * characters GLOB_NOMAGIC is there just for compatibility 537 * with csh. 538 */ 539 if ((pglob->gl_flags & GLOB_NOCHECK) || 540 ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR)) 541 == GLOB_NOMAGIC)) { 542 return globextend(pattern, pglob, &limit); 543 } else { 544 return (GLOB_NOMATCH); 545 } 546 } else if (!(pglob->gl_flags & GLOB_NOSORT)) { 547 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc, 548 (size_t)pglob->gl_pathc - oldpathc, sizeof(char *), 549 compare); 550 } 551 552 return(0); 553 } 554 555 static int 556 compare(p, q) 557 const void *p, *q; 558 { 559 560 _DIAGASSERT(p != NULL); 561 _DIAGASSERT(q != NULL); 562 563 return(strcoll(*(const char * const *)p, *(const char * const *)q)); 564 } 565 566 static int 567 glob1(pattern, pglob, limit) 568 Char *pattern; 569 glob_t *pglob; 570 size_t *limit; 571 { 572 Char pathbuf[MAXPATHLEN+1]; 573 574 _DIAGASSERT(pattern != NULL); 575 _DIAGASSERT(pglob != NULL); 576 577 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */ 578 if (*pattern == EOS) 579 return(0); 580 /* 581 * we save one character so that we can use ptr >= limit, 582 * in the general case when we are appending non nul chars only. 583 */ 584 return(glob2(pathbuf, pathbuf, pathbuf + sizeof(pathbuf) - 1, pattern, 585 pglob, limit)); 586 } 587 588 /* 589 * The functions glob2 and glob3 are mutually recursive; there is one level 590 * of recursion for each segment in the pattern that contains one or more 591 * meta characters. 592 */ 593 static int 594 glob2(pathbuf, pathend, pathlim, pattern, pglob, limit) 595 Char *pathbuf, *pathend, *pathlim, *pattern; 596 glob_t *pglob; 597 size_t *limit; 598 { 599 __gl_stat_t sb; 600 Char *p, *q; 601 int anymeta; 602 603 _DIAGASSERT(pathbuf != NULL); 604 _DIAGASSERT(pathend != NULL); 605 _DIAGASSERT(pattern != NULL); 606 _DIAGASSERT(pglob != NULL); 607 608 /* 609 * Loop over pattern segments until end of pattern or until 610 * segment with meta character found. 611 */ 612 for (anymeta = 0;;) { 613 if (*pattern == EOS) { /* End of pattern? */ 614 *pathend = EOS; 615 if (g_lstat(pathbuf, &sb, pglob)) 616 return(0); 617 618 if (((pglob->gl_flags & GLOB_MARK) && 619 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) || 620 (S_ISLNK(sb.st_mode) && 621 (g_stat(pathbuf, &sb, pglob) == 0) && 622 S_ISDIR(sb.st_mode)))) { 623 if (pathend >= pathlim) 624 return (GLOB_ABORTED); 625 *pathend++ = SEP; 626 *pathend = EOS; 627 } 628 ++pglob->gl_matchc; 629 return(globextend(pathbuf, pglob, limit)); 630 } 631 632 /* Find end of next segment, copy tentatively to pathend. */ 633 q = pathend; 634 p = pattern; 635 while (*p != EOS && *p != SEP) { 636 if (ismeta(*p)) 637 anymeta = 1; 638 if (q >= pathlim) 639 return GLOB_ABORTED; 640 *q++ = *p++; 641 } 642 643 if (!anymeta) { /* No expansion, do next segment. */ 644 pathend = q; 645 pattern = p; 646 while (*pattern == SEP) { 647 if (pathend >= pathlim) 648 return GLOB_ABORTED; 649 *pathend++ = *pattern++; 650 } 651 } else /* Need expansion, recurse. */ 652 return(glob3(pathbuf, pathend, pathlim, pattern, p, 653 pglob, limit)); 654 } 655 /* NOTREACHED */ 656 } 657 658 static int 659 glob3(pathbuf, pathend, pathlim, pattern, restpattern, pglob, limit) 660 Char *pathbuf, *pathend, *pathlim, *pattern, *restpattern; 661 glob_t *pglob; 662 size_t *limit; 663 { 664 struct dirent *dp; 665 DIR *dirp; 666 int error; 667 char buf[MAXPATHLEN]; 668 669 /* 670 * The readdirfunc declaration can't be prototyped, because it is 671 * assigned, below, to two functions which are prototyped in glob.h 672 * and dirent.h as taking pointers to differently typed opaque 673 * structures. 674 */ 675 struct dirent *(*readdirfunc) __P((void *)); 676 677 _DIAGASSERT(pathbuf != NULL); 678 _DIAGASSERT(pathend != NULL); 679 _DIAGASSERT(pattern != NULL); 680 _DIAGASSERT(restpattern != NULL); 681 _DIAGASSERT(pglob != NULL); 682 683 *pathend = EOS; 684 errno = 0; 685 686 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) { 687 if (pglob->gl_errfunc) { 688 if (g_Ctoc(pathbuf, buf, sizeof(buf))) 689 return (GLOB_ABORTED); 690 if (pglob->gl_errfunc(buf, errno) || 691 pglob->gl_flags & GLOB_ERR) 692 return (GLOB_ABORTED); 693 } 694 /* 695 * Posix/XOpen: glob should return when it encounters a 696 * directory that it cannot open or read 697 * XXX: Should we ignore ENOTDIR and ENOENT though? 698 * I think that Posix had in mind EPERM... 699 */ 700 if (pglob->gl_flags & GLOB_ERR) 701 return (GLOB_ABORTED); 702 703 return(0); 704 } 705 706 error = 0; 707 708 /* Search directory for matching names. */ 709 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 710 readdirfunc = pglob->gl_readdir; 711 else 712 readdirfunc = (struct dirent *(*)__P((void *))) readdir; 713 while ((dp = (*readdirfunc)(dirp)) != NULL) { 714 u_char *sc; 715 Char *dc; 716 717 /* Initial DOT must be matched literally. */ 718 if (dp->d_name[0] == DOT && *pattern != DOT) 719 continue; 720 /* 721 * The resulting string contains EOS, so we can 722 * use the pathlim character, if it is the nul 723 */ 724 for (sc = (u_char *) dp->d_name, dc = pathend; 725 dc <= pathlim && (*dc++ = *sc++) != EOS;) 726 continue; 727 728 /* 729 * Have we filled the buffer without seeing EOS? 730 */ 731 if (dc > pathlim && *pathlim != EOS) { 732 /* 733 * Abort when requested by caller, otherwise 734 * reset pathend back to last SEP and continue 735 * with next dir entry. 736 */ 737 if (pglob->gl_flags & GLOB_ERR) { 738 error = GLOB_ABORTED; 739 break; 740 } 741 else { 742 *pathend = EOS; 743 continue; 744 } 745 } 746 747 if (!match(pathend, pattern, restpattern)) { 748 *pathend = EOS; 749 continue; 750 } 751 error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit); 752 if (error) 753 break; 754 } 755 756 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 757 (*pglob->gl_closedir)(dirp); 758 else 759 closedir(dirp); 760 761 /* 762 * Again Posix X/Open issue with regards to error handling. 763 */ 764 if ((error || errno) && (pglob->gl_flags & GLOB_ERR)) 765 return (GLOB_ABORTED); 766 767 return(error); 768 } 769 770 771 /* 772 * Extend the gl_pathv member of a glob_t structure to accomodate a new item, 773 * add the new item, and update gl_pathc. 774 * 775 * This assumes the BSD realloc, which only copies the block when its size 776 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic 777 * behavior. 778 * 779 * Return 0 if new item added, error code if memory couldn't be allocated. 780 * 781 * Invariant of the glob_t structure: 782 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and 783 * gl_pathv points to (gl_offs + gl_pathc + 1) items. 784 */ 785 static int 786 globextend(path, pglob, limit) 787 const Char *path; 788 glob_t *pglob; 789 size_t *limit; 790 { 791 char **pathv; 792 int i; 793 size_t newsize, len; 794 char *copy; 795 const Char *p; 796 797 _DIAGASSERT(path != NULL); 798 _DIAGASSERT(pglob != NULL); 799 800 newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs); 801 pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) : 802 malloc(newsize); 803 if (pathv == NULL) 804 return(GLOB_NOSPACE); 805 806 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) { 807 /* first time around -- clear initial gl_offs items */ 808 pathv += pglob->gl_offs; 809 for (i = pglob->gl_offs; --i >= 0; ) 810 *--pathv = NULL; 811 } 812 pglob->gl_pathv = pathv; 813 814 for (p = path; *p++;) 815 continue; 816 len = (size_t)(p - path); 817 *limit += len; 818 if ((copy = malloc(len)) != NULL) { 819 if (g_Ctoc(path, copy, len)) { 820 free(copy); 821 return(GLOB_ABORTED); 822 } 823 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy; 824 } 825 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL; 826 827 if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) { 828 errno = 0; 829 return(GLOB_NOSPACE); 830 } 831 832 return(copy == NULL ? GLOB_NOSPACE : 0); 833 } 834 835 836 /* 837 * pattern matching function for filenames. Each occurrence of the * 838 * pattern causes a recursion level. 839 */ 840 static int 841 match(name, pat, patend) 842 Char *name, *pat, *patend; 843 { 844 int ok, negate_range; 845 Char c, k; 846 847 _DIAGASSERT(name != NULL); 848 _DIAGASSERT(pat != NULL); 849 _DIAGASSERT(patend != NULL); 850 851 while (pat < patend) { 852 c = *pat++; 853 switch (c & M_MASK) { 854 case M_ALL: 855 if (pat == patend) 856 return(1); 857 do 858 if (match(name, pat, patend)) 859 return(1); 860 while (*name++ != EOS); 861 return(0); 862 case M_ONE: 863 if (*name++ == EOS) 864 return(0); 865 break; 866 case M_SET: 867 ok = 0; 868 if ((k = *name++) == EOS) 869 return(0); 870 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS) 871 ++pat; 872 while (((c = *pat++) & M_MASK) != M_END) 873 if ((*pat & M_MASK) == M_RNG) { 874 if (c <= k && k <= pat[1]) 875 ok = 1; 876 pat += 2; 877 } else if (c == k) 878 ok = 1; 879 if (ok == negate_range) 880 return(0); 881 break; 882 default: 883 if (*name++ != c) 884 return(0); 885 break; 886 } 887 } 888 return(*name == EOS); 889 } 890 891 /* Free allocated data belonging to a glob_t structure. */ 892 void 893 globfree(pglob) 894 glob_t *pglob; 895 { 896 int i; 897 char **pp; 898 899 _DIAGASSERT(pglob != NULL); 900 901 if (pglob->gl_pathv != NULL) { 902 pp = pglob->gl_pathv + pglob->gl_offs; 903 for (i = pglob->gl_pathc; i--; ++pp) 904 if (*pp) 905 free(*pp); 906 free(pglob->gl_pathv); 907 pglob->gl_pathv = NULL; 908 pglob->gl_pathc = 0; 909 } 910 } 911 912 static DIR * 913 g_opendir(str, pglob) 914 Char *str; 915 glob_t *pglob; 916 { 917 char buf[MAXPATHLEN]; 918 919 _DIAGASSERT(str != NULL); 920 _DIAGASSERT(pglob != NULL); 921 922 if (!*str) 923 (void)strlcpy(buf, ".", sizeof(buf)); 924 else { 925 if (g_Ctoc(str, buf, sizeof(buf))) 926 return NULL; 927 } 928 929 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 930 return((*pglob->gl_opendir)(buf)); 931 932 return(opendir(buf)); 933 } 934 935 static int 936 g_lstat(fn, sb, pglob) 937 Char *fn; 938 __gl_stat_t *sb; 939 glob_t *pglob; 940 { 941 char buf[MAXPATHLEN]; 942 943 _DIAGASSERT(fn != NULL); 944 _DIAGASSERT(sb != NULL); 945 _DIAGASSERT(pglob != NULL); 946 947 if (g_Ctoc(fn, buf, sizeof(buf))) 948 return -1; 949 if (pglob->gl_flags & GLOB_ALTDIRFUNC) 950 return((*pglob->gl_lstat)(buf, sb)); 951 return(lstat(buf, sb)); 952 } 953 954 static int 955 g_stat(fn, sb, pglob) 956 Char *fn; 957 __gl_stat_t *sb; 958 glob_t *pglob; 959 { 960 char buf[MAXPATHLEN]; 961 962 _DIAGASSERT(fn != NULL); 963 _DIAGASSERT(sb != NULL); 964 _DIAGASSERT(pglob != NULL); 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(str, ch) 975 const Char *str; 976 int ch; 977 { 978 979 _DIAGASSERT(str != NULL); 980 981 do { 982 if (*str == ch) 983 /* LINTED this is libc's definition! */ 984 return (Char *)str; 985 } while (*str++); 986 return NULL; 987 } 988 989 static int 990 g_Ctoc(str, buf, len) 991 const Char *str; 992 char *buf; 993 size_t len; 994 { 995 char *dc; 996 997 _DIAGASSERT(str != NULL); 998 _DIAGASSERT(buf != NULL); 999 1000 if (len == 0) 1001 return 1; 1002 1003 for (dc = buf; len && (*dc++ = *str++) != EOS; len--) 1004 continue; 1005 1006 return len == 0; 1007 } 1008 1009 #ifdef DEBUG 1010 static void 1011 qprintf(str, s) 1012 const char *str; 1013 Char *s; 1014 { 1015 Char *p; 1016 1017 _DIAGASSERT(str != NULL); 1018 _DIAGASSERT(s != NULL); 1019 1020 (void)printf("%s:\n", str); 1021 for (p = s; *p; p++) 1022 (void)printf("%c", CHAR(*p)); 1023 (void)printf("\n"); 1024 for (p = s; *p; p++) 1025 (void)printf("%c", *p & M_PROTECT ? '"' : ' '); 1026 (void)printf("\n"); 1027 for (p = s; *p; p++) 1028 (void)printf("%c", ismeta(*p) ? '_' : ' '); 1029 (void)printf("\n"); 1030 } 1031 #endif 1032
Indexes created Tue Sep 30 20:09:53 GMT 2025