Annotation of src/lib/libc/gen/glob.c, Revision 1.23.10.2
1.23.10.2! riz 1: /* $NetBSD: glob.c,v 1.29 2011/01/22 16:24:44 christos Exp $ */
1.5 cgd 2:
1.1 cgd 3: /*
1.12 christos 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.
1.1 cgd 33: */
34:
1.12 christos 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
1.23.10.2! riz 40: __RCSID("$NetBSD: glob.c,v 1.23.10.1 2010/07/19 18:15:17 riz Exp $");
1.12 christos 41: #endif
42: #endif /* LIBC_SCCS and not lint */
1.1 cgd 43:
1.12 christos 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
1.19 christos 62: * GLOB_PERIOD:
63: * allow metacharacters to match leading dots in filenames.
1.22 christos 64: * GLOB_NO_DOTDIRS:
65: * . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
1.12 christos 66: * gl_matchc:
67: * Number of matches in the current invocation of glob.
68: */
69:
70: #include "namespace.h"
71: #include <sys/param.h>
72: #include <sys/stat.h>
73:
74: #include <assert.h>
75: #include <ctype.h>
76: #include <dirent.h>
77: #include <errno.h>
78: #include <glob.h>
79: #include <pwd.h>
80: #include <stdio.h>
1.21 christos 81: #include <stddef.h>
1.12 christos 82: #include <stdlib.h>
83: #include <string.h>
84: #include <unistd.h>
85:
86: #ifdef HAVE_NBTOOL_CONFIG_H
87: #define NO_GETPW_R
88: #endif
89:
1.23.10.2! riz 90: #define GLOB_LIMIT_STRING 65536 /* number of readdirs */
! 91: #define GLOB_LIMIT_STAT 128 /* number of stat system calls */
! 92: #define GLOB_LIMIT_READDIR 16384 /* total buffer size of path strings */
! 93: #define GLOB_LIMIT_PATH 1024 /* number of path elements */
! 94: #define GLOB_LIMIT_BRACE 128 /* Number of brace calls */
! 95:
! 96: struct glob_limit {
! 97: size_t l_string;
! 98: size_t l_stat;
! 99: size_t l_readdir;
! 100: size_t l_brace;
! 101: };
1.23 ad 102:
1.12 christos 103: /*
104: * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
105: */
106: #ifndef _DIAGASSERT
107: #define _DIAGASSERT(a)
108: #endif
109:
110: #define DOLLAR '$'
111: #define DOT '.'
112: #define EOS '\0'
113: #define LBRACKET '['
114: #define NOT '!'
115: #define QUESTION '?'
116: #define QUOTE '\\'
117: #define RANGE '-'
118: #define RBRACKET ']'
119: #define SEP '/'
120: #define STAR '*'
121: #define TILDE '~'
122: #define UNDERSCORE '_'
123: #define LBRACE '{'
124: #define RBRACE '}'
125: #define SLASH '/'
126: #define COMMA ','
127:
1.15 christos 128: #ifndef USE_8BIT_CHARS
1.12 christos 129:
130: #define M_QUOTE 0x8000
131: #define M_PROTECT 0x4000
132: #define M_MASK 0xffff
133: #define M_ASCII 0x00ff
134:
135: typedef u_short Char;
136:
137: #else
138:
1.15 christos 139: #define M_QUOTE (Char)0x80
140: #define M_PROTECT (Char)0x40
141: #define M_MASK (Char)0xff
142: #define M_ASCII (Char)0x7f
1.12 christos 143:
144: typedef char Char;
145:
146: #endif
147:
148:
149: #define CHAR(c) ((Char)((c)&M_ASCII))
150: #define META(c) ((Char)((c)|M_QUOTE))
151: #define M_ALL META('*')
152: #define M_END META(']')
153: #define M_NOT META('!')
154: #define M_ONE META('?')
155: #define M_RNG META('-')
156: #define M_SET META('[')
157: #define ismeta(c) (((c)&M_QUOTE) != 0)
158:
159:
1.18 christos 160: static int compare(const void *, const void *);
161: static int g_Ctoc(const Char *, char *, size_t);
162: static int g_lstat(Char *, __gl_stat_t *, glob_t *);
163: static DIR *g_opendir(Char *, glob_t *);
164: static Char *g_strchr(const Char *, int);
165: static int g_stat(Char *, __gl_stat_t *, glob_t *);
1.23.10.2! riz 166: static int glob0(const Char *, glob_t *, struct glob_limit *);
! 167: static int glob1(Char *, glob_t *, struct glob_limit *);
! 168: static int glob2(Char *, Char *, Char *, const Char *, glob_t *,
! 169: struct glob_limit *);
! 170: static int glob3(Char *, Char *, Char *, const Char *, const Char *,
! 171: glob_t *, struct glob_limit *);
! 172: static int globextend(const Char *, glob_t *, struct glob_limit *);
1.18 christos 173: static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
1.23.10.2! riz 174: static int globexp1(const Char *, glob_t *, struct glob_limit *);
1.23.10.1 riz 175: static int globexp2(const Char *, const Char *, glob_t *, int *,
1.23.10.2! riz 176: struct glob_limit *);
! 177: static int match(const Char *, const Char *, const Char *);
1.12 christos 178: #ifdef DEBUG
1.18 christos 179: static void qprintf(const char *, Char *);
1.12 christos 180: #endif
181:
182: int
1.18 christos 183: glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
184: glob_t *pglob)
1.12 christos 185: {
186: const u_char *patnext;
187: int c;
188: Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
1.23.10.2! riz 189: struct glob_limit limit = { 0, 0, 0, 0 };
1.12 christos 190:
191: _DIAGASSERT(pattern != NULL);
192:
193: patnext = (const u_char *) pattern;
194: if (!(flags & GLOB_APPEND)) {
195: pglob->gl_pathc = 0;
196: pglob->gl_pathv = NULL;
197: if (!(flags & GLOB_DOOFFS))
198: pglob->gl_offs = 0;
199: }
200: pglob->gl_flags = flags & ~GLOB_MAGCHAR;
201: pglob->gl_errfunc = errfunc;
202: pglob->gl_matchc = 0;
203:
204: bufnext = patbuf;
205: bufend = bufnext + MAXPATHLEN;
206: if (flags & GLOB_NOESCAPE) {
207: while (bufnext < bufend && (c = *patnext++) != EOS)
208: *bufnext++ = c;
209: } else {
210: /* Protect the quoted characters. */
211: while (bufnext < bufend && (c = *patnext++) != EOS)
212: if (c == QUOTE) {
213: if ((c = *patnext++) == EOS) {
214: c = QUOTE;
215: --patnext;
216: }
217: *bufnext++ = c | M_PROTECT;
218: }
219: else
220: *bufnext++ = c;
221: }
222: *bufnext = EOS;
223:
224: if (flags & GLOB_BRACE)
1.23.10.2! riz 225: return globexp1(patbuf, pglob, &limit);
1.12 christos 226: else
1.23.10.2! riz 227: return glob0(patbuf, pglob, &limit);
1.12 christos 228: }
229:
230: /*
231: * Expand recursively a glob {} pattern. When there is no more expansion
232: * invoke the standard globbing routine to glob the rest of the magic
233: * characters
234: */
235: static int
1.23.10.2! riz 236: globexp1(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
1.12 christos 237: {
238: const Char* ptr = pattern;
239: int rv;
240:
241: _DIAGASSERT(pattern != NULL);
242: _DIAGASSERT(pglob != NULL);
243:
1.23.10.2! riz 244: if ((pglob->gl_flags & GLOB_LIMIT) &&
! 245: limit->l_brace++ >= GLOB_LIMIT_BRACE) {
! 246: errno = 0;
! 247: return GLOB_NOSPACE;
! 248: }
! 249:
1.12 christos 250: /* Protect a single {}, for find(1), like csh */
251: if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
1.23.10.1 riz 252: return glob0(pattern, pglob, limit);
1.12 christos 253:
254: while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
1.23.10.1 riz 255: if (!globexp2(ptr, pattern, pglob, &rv, limit))
1.12 christos 256: return rv;
257:
1.23.10.1 riz 258: return glob0(pattern, pglob, limit);
1.12 christos 259: }
260:
261:
262: /*
263: * Recursive brace globbing helper. Tries to expand a single brace.
264: * If it succeeds then it invokes globexp1 with the new pattern.
265: * If it fails then it tries to glob the rest of the pattern and returns.
266: */
267: static int
1.23.10.1 riz 268: globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
1.23.10.2! riz 269: struct glob_limit *limit)
1.12 christos 270: {
271: int i;
272: Char *lm, *ls;
273: const Char *pe, *pm, *pl;
274: Char patbuf[MAXPATHLEN + 1];
275:
276: _DIAGASSERT(ptr != NULL);
277: _DIAGASSERT(pattern != NULL);
278: _DIAGASSERT(pglob != NULL);
279: _DIAGASSERT(rv != NULL);
280:
281: /* copy part up to the brace */
282: for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
283: continue;
284: ls = lm;
285:
286: /* Find the balanced brace */
287: for (i = 0, pe = ++ptr; *pe; pe++)
288: if (*pe == LBRACKET) {
289: /* Ignore everything between [] */
290: for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
291: continue;
292: if (*pe == EOS) {
293: /*
294: * We could not find a matching RBRACKET.
295: * Ignore and just look for RBRACE
296: */
297: pe = pm;
298: }
299: }
300: else if (*pe == LBRACE)
301: i++;
302: else if (*pe == RBRACE) {
303: if (i == 0)
304: break;
305: i--;
306: }
307:
308: /* Non matching braces; just glob the pattern */
309: if (i != 0 || *pe == EOS) {
310: /*
311: * we use `pattern', not `patbuf' here so that that
312: * unbalanced braces are passed to the match
313: */
1.23.10.1 riz 314: *rv = glob0(pattern, pglob, limit);
1.12 christos 315: return 0;
316: }
317:
318: for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
319: switch (*pm) {
320: case LBRACKET:
321: /* Ignore everything between [] */
322: for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
323: continue;
324: if (*pm == EOS) {
325: /*
326: * We could not find a matching RBRACKET.
327: * Ignore and just look for RBRACE
328: */
329: pm = pl;
330: }
331: break;
332:
333: case LBRACE:
334: i++;
335: break;
336:
337: case RBRACE:
338: if (i) {
339: i--;
340: break;
341: }
342: /* FALLTHROUGH */
343: case COMMA:
344: if (i && *pm == COMMA)
345: break;
346: else {
347: /* Append the current string */
348: for (lm = ls; (pl < pm); *lm++ = *pl++)
349: continue;
350: /*
351: * Append the rest of the pattern after the
352: * closing brace
353: */
354: for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
355: continue;
356:
357: /* Expand the current pattern */
358: #ifdef DEBUG
359: qprintf("globexp2:", patbuf);
360: #endif
1.23.10.1 riz 361: *rv = globexp1(patbuf, pglob, limit);
1.12 christos 362:
363: /* move after the comma, to the next string */
364: pl = pm + 1;
365: }
366: break;
367:
368: default:
369: break;
370: }
371: }
372: *rv = 0;
373: return 0;
374: }
375:
376:
377:
378: /*
379: * expand tilde from the passwd file.
380: */
381: static const Char *
1.18 christos 382: globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
1.12 christos 383: {
384: struct passwd *pwd;
385: const char *h;
386: const Char *p;
387: Char *b;
388: char *d;
389: Char *pend = &patbuf[patsize / sizeof(Char)];
390: #ifndef NO_GETPW_R
391: struct passwd pwres;
392: char pwbuf[1024];
393: #endif
394:
395: pend--;
396:
397: _DIAGASSERT(pattern != NULL);
398: _DIAGASSERT(patbuf != NULL);
399: _DIAGASSERT(pglob != NULL);
400:
401: if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
402: return pattern;
403:
404: /* Copy up to the end of the string or / */
405: for (p = pattern + 1, d = (char *)(void *)patbuf;
406: d < (char *)(void *)pend && *p && *p != SLASH;
407: *d++ = *p++)
408: continue;
409:
410: if (d == (char *)(void *)pend)
411: return NULL;
412:
413: *d = EOS;
414: d = (char *)(void *)patbuf;
415:
416: if (*d == EOS) {
417: /*
418: * handle a plain ~ or ~/ by expanding $HOME
419: * first and then trying the password file
420: */
421: if ((h = getenv("HOME")) == NULL) {
422: #ifdef NO_GETPW_R
423: if ((pwd = getpwuid(getuid())) == NULL)
424: #else
425: if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
426: &pwd) != 0 || pwd == NULL)
427: #endif
428: return pattern;
429: else
430: h = pwd->pw_dir;
431: }
432: }
433: else {
434: /*
435: * Expand a ~user
436: */
437: #ifdef NO_GETPW_R
438: if ((pwd = getpwnam(d)) == NULL)
439: #else
440: if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
441: pwd == NULL)
442: #endif
443: return pattern;
444: else
445: h = pwd->pw_dir;
446: }
447:
448: /* Copy the home directory */
449: for (b = patbuf; b < pend && *h; *b++ = *h++)
450: continue;
451:
452: if (b == pend)
453: return NULL;
454:
455: /* Append the rest of the pattern */
456: while (b < pend && (*b++ = *p++) != EOS)
457: continue;
458:
459: if (b == pend)
460: return NULL;
461:
462: return patbuf;
463: }
464:
465:
466: /*
467: * The main glob() routine: compiles the pattern (optionally processing
468: * quotes), calls glob1() to do the real pattern matching, and finally
469: * sorts the list (unless unsorted operation is requested). Returns 0
470: * if things went well, nonzero if errors occurred. It is not an error
471: * to find no matches.
472: */
473: static int
1.23.10.2! riz 474: glob0(const Char *pattern, glob_t *pglob, struct glob_limit *limit)
1.12 christos 475: {
476: const Char *qpatnext;
1.16 christos 477: int c, error;
478: __gl_size_t oldpathc;
1.12 christos 479: Char *bufnext, patbuf[MAXPATHLEN+1];
480:
481: _DIAGASSERT(pattern != NULL);
482: _DIAGASSERT(pglob != NULL);
483:
484: if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
485: pglob)) == NULL)
486: return GLOB_ABEND;
487: oldpathc = pglob->gl_pathc;
488: bufnext = patbuf;
489:
490: /* We don't need to check for buffer overflow any more. */
491: while ((c = *qpatnext++) != EOS) {
492: switch (c) {
493: case LBRACKET:
494: c = *qpatnext;
495: if (c == NOT)
496: ++qpatnext;
497: if (*qpatnext == EOS ||
498: g_strchr(qpatnext+1, RBRACKET) == NULL) {
499: *bufnext++ = LBRACKET;
500: if (c == NOT)
501: --qpatnext;
502: break;
503: }
504: *bufnext++ = M_SET;
505: if (c == NOT)
506: *bufnext++ = M_NOT;
507: c = *qpatnext++;
508: do {
509: *bufnext++ = CHAR(c);
510: if (*qpatnext == RANGE &&
511: (c = qpatnext[1]) != RBRACKET) {
512: *bufnext++ = M_RNG;
513: *bufnext++ = CHAR(c);
514: qpatnext += 2;
515: }
516: } while ((c = *qpatnext++) != RBRACKET);
517: pglob->gl_flags |= GLOB_MAGCHAR;
518: *bufnext++ = M_END;
519: break;
520: case QUESTION:
521: pglob->gl_flags |= GLOB_MAGCHAR;
522: *bufnext++ = M_ONE;
523: break;
524: case STAR:
525: pglob->gl_flags |= GLOB_MAGCHAR;
526: /* collapse adjacent stars to one,
527: * to avoid exponential behavior
528: */
529: if (bufnext == patbuf || bufnext[-1] != M_ALL)
530: *bufnext++ = M_ALL;
531: break;
532: default:
533: *bufnext++ = CHAR(c);
534: break;
535: }
536: }
537: *bufnext = EOS;
538: #ifdef DEBUG
539: qprintf("glob0:", patbuf);
540: #endif
541:
1.23.10.1 riz 542: if ((error = glob1(patbuf, pglob, limit)) != 0)
1.18 christos 543: return error;
1.12 christos 544:
545: if (pglob->gl_pathc == oldpathc) {
546: /*
547: * If there was no match we are going to append the pattern
548: * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
549: * specified and the pattern did not contain any magic
550: * characters GLOB_NOMAGIC is there just for compatibility
551: * with csh.
552: */
553: if ((pglob->gl_flags & GLOB_NOCHECK) ||
554: ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
555: == GLOB_NOMAGIC)) {
1.23.10.1 riz 556: return globextend(pattern, pglob, limit);
1.12 christos 557: } else {
1.18 christos 558: return GLOB_NOMATCH;
1.12 christos 559: }
560: } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
561: qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
562: (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
563: compare);
564: }
565:
1.18 christos 566: return 0;
1.12 christos 567: }
568:
569: static int
1.18 christos 570: compare(const void *p, const void *q)
1.12 christos 571: {
572:
573: _DIAGASSERT(p != NULL);
574: _DIAGASSERT(q != NULL);
575:
1.18 christos 576: return strcoll(*(const char * const *)p, *(const char * const *)q);
1.12 christos 577: }
578:
579: static int
1.23.10.2! riz 580: glob1(Char *pattern, glob_t *pglob, struct glob_limit *limit)
1.12 christos 581: {
582: Char pathbuf[MAXPATHLEN+1];
583:
584: _DIAGASSERT(pattern != NULL);
585: _DIAGASSERT(pglob != NULL);
586:
587: /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
588: if (*pattern == EOS)
1.18 christos 589: return 0;
1.12 christos 590: /*
591: * we save one character so that we can use ptr >= limit,
592: * in the general case when we are appending non nul chars only.
593: */
1.18 christos 594: return glob2(pathbuf, pathbuf,
595: pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
596: pglob, limit);
1.12 christos 597: }
598:
599: /*
600: * The functions glob2 and glob3 are mutually recursive; there is one level
601: * of recursion for each segment in the pattern that contains one or more
602: * meta characters.
603: */
604: static int
1.23.10.2! riz 605: glob2(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
! 606: glob_t *pglob, struct glob_limit *limit)
1.12 christos 607: {
608: __gl_stat_t sb;
1.23.10.2! riz 609: const Char *p;
! 610: Char *q;
1.12 christos 611: int anymeta;
1.21 christos 612: Char *pend;
613: ptrdiff_t diff;
1.12 christos 614:
615: _DIAGASSERT(pathbuf != NULL);
616: _DIAGASSERT(pathend != NULL);
617: _DIAGASSERT(pattern != NULL);
618: _DIAGASSERT(pglob != NULL);
619:
620: /*
621: * Loop over pattern segments until end of pattern or until
622: * segment with meta character found.
623: */
624: for (anymeta = 0;;) {
625: if (*pattern == EOS) { /* End of pattern? */
626: *pathend = EOS;
627: if (g_lstat(pathbuf, &sb, pglob))
1.18 christos 628: return 0;
1.12 christos 629:
1.23.10.1 riz 630: if ((pglob->gl_flags & GLOB_LIMIT) &&
1.23.10.2! riz 631: limit->l_stat++ >= GLOB_LIMIT_STAT) {
1.23.10.1 riz 632: errno = 0;
633: *pathend++ = SEP;
634: *pathend = EOS;
635: return GLOB_NOSPACE;
636: }
1.12 christos 637: if (((pglob->gl_flags & GLOB_MARK) &&
638: pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
639: (S_ISLNK(sb.st_mode) &&
640: (g_stat(pathbuf, &sb, pglob) == 0) &&
641: S_ISDIR(sb.st_mode)))) {
642: if (pathend >= pathlim)
1.18 christos 643: return GLOB_ABORTED;
1.12 christos 644: *pathend++ = SEP;
645: *pathend = EOS;
646: }
647: ++pglob->gl_matchc;
1.18 christos 648: return globextend(pathbuf, pglob, limit);
1.12 christos 649: }
650:
651: /* Find end of next segment, copy tentatively to pathend. */
652: q = pathend;
653: p = pattern;
654: while (*p != EOS && *p != SEP) {
655: if (ismeta(*p))
656: anymeta = 1;
657: if (q >= pathlim)
658: return GLOB_ABORTED;
659: *q++ = *p++;
660: }
661:
1.20 christos 662: /*
1.21 christos 663: * No expansion, or path ends in slash-dot shash-dot-dot,
1.20 christos 664: * do next segment.
665: */
1.21 christos 666: if (pglob->gl_flags & GLOB_PERIOD) {
667: for (pend = pathend; pend > pathbuf && pend[-1] == '/';
668: pend--)
669: continue;
670: diff = pend - pathbuf;
671: } else {
672: /* XXX: GCC */
673: diff = 0;
674: pend = pathend;
675: }
676:
677: if ((!anymeta) ||
678: ((pglob->gl_flags & GLOB_PERIOD) &&
679: (diff >= 1 && pend[-1] == DOT) &&
680: (diff >= 2 && (pend[-2] == SLASH || pend[-2] == DOT)) &&
681: (diff < 3 || pend[-3] == SLASH))) {
1.12 christos 682: pathend = q;
683: pattern = p;
684: while (*pattern == SEP) {
685: if (pathend >= pathlim)
686: return GLOB_ABORTED;
687: *pathend++ = *pattern++;
688: }
689: } else /* Need expansion, recurse. */
1.18 christos 690: return glob3(pathbuf, pathend, pathlim, pattern, p,
691: pglob, limit);
1.12 christos 692: }
693: /* NOTREACHED */
694: }
695:
696: static int
1.23.10.2! riz 697: glob3(Char *pathbuf, Char *pathend, Char *pathlim, const Char *pattern,
! 698: const Char *restpattern, glob_t *pglob, struct glob_limit *limit)
1.12 christos 699: {
700: struct dirent *dp;
701: DIR *dirp;
702: int error;
703: char buf[MAXPATHLEN];
704:
705: /*
706: * The readdirfunc declaration can't be prototyped, because it is
707: * assigned, below, to two functions which are prototyped in glob.h
708: * and dirent.h as taking pointers to differently typed opaque
709: * structures.
710: */
1.18 christos 711: struct dirent *(*readdirfunc)(void *);
1.12 christos 712:
713: _DIAGASSERT(pathbuf != NULL);
714: _DIAGASSERT(pathend != NULL);
715: _DIAGASSERT(pattern != NULL);
716: _DIAGASSERT(restpattern != NULL);
717: _DIAGASSERT(pglob != NULL);
718:
719: *pathend = EOS;
720: errno = 0;
721:
722: if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
723: if (pglob->gl_errfunc) {
724: if (g_Ctoc(pathbuf, buf, sizeof(buf)))
1.18 christos 725: return GLOB_ABORTED;
1.12 christos 726: if (pglob->gl_errfunc(buf, errno) ||
727: pglob->gl_flags & GLOB_ERR)
1.18 christos 728: return GLOB_ABORTED;
1.12 christos 729: }
730: /*
731: * Posix/XOpen: glob should return when it encounters a
732: * directory that it cannot open or read
733: * XXX: Should we ignore ENOTDIR and ENOENT though?
734: * I think that Posix had in mind EPERM...
735: */
736: if (pglob->gl_flags & GLOB_ERR)
1.18 christos 737: return GLOB_ABORTED;
1.12 christos 738:
1.18 christos 739: return 0;
1.12 christos 740: }
741:
742: error = 0;
743:
744: /* Search directory for matching names. */
745: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
746: readdirfunc = pglob->gl_readdir;
747: else
748: readdirfunc = (struct dirent *(*)__P((void *))) readdir;
749: while ((dp = (*readdirfunc)(dirp)) != NULL) {
750: u_char *sc;
751: Char *dc;
752:
1.23.10.1 riz 753: if ((pglob->gl_flags & GLOB_LIMIT) &&
1.23.10.2! riz 754: limit->l_readdir++ >= GLOB_LIMIT_READDIR) {
1.23.10.1 riz 755: errno = 0;
756: *pathend++ = SEP;
757: *pathend = EOS;
758: return GLOB_NOSPACE;
759: }
760:
1.19 christos 761: /*
762: * Initial DOT must be matched literally, unless we have
763: * GLOB_PERIOD set.
764: */
765: if ((pglob->gl_flags & GLOB_PERIOD) == 0)
766: if (dp->d_name[0] == DOT && *pattern != DOT)
767: continue;
1.12 christos 768: /*
1.22 christos 769: * If GLOB_NO_DOTDIRS is set, . and .. vanish.
770: */
771: if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
772: (dp->d_name[0] == DOT) &&
773: ((dp->d_name[1] == EOS) ||
774: ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
775: continue;
776: /*
1.12 christos 777: * The resulting string contains EOS, so we can
778: * use the pathlim character, if it is the nul
779: */
780: for (sc = (u_char *) dp->d_name, dc = pathend;
781: dc <= pathlim && (*dc++ = *sc++) != EOS;)
782: continue;
783:
784: /*
785: * Have we filled the buffer without seeing EOS?
786: */
787: if (dc > pathlim && *pathlim != EOS) {
788: /*
789: * Abort when requested by caller, otherwise
790: * reset pathend back to last SEP and continue
791: * with next dir entry.
792: */
793: if (pglob->gl_flags & GLOB_ERR) {
794: error = GLOB_ABORTED;
795: break;
796: }
797: else {
798: *pathend = EOS;
799: continue;
800: }
801: }
802:
803: if (!match(pathend, pattern, restpattern)) {
804: *pathend = EOS;
805: continue;
806: }
1.23.10.1 riz 807: error = glob2(pathbuf, --dc, pathlim, restpattern, pglob,
808: limit);
1.12 christos 809: if (error)
810: break;
811: }
812:
813: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
814: (*pglob->gl_closedir)(dirp);
815: else
816: closedir(dirp);
817:
818: /*
819: * Again Posix X/Open issue with regards to error handling.
820: */
821: if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
1.18 christos 822: return GLOB_ABORTED;
1.12 christos 823:
1.18 christos 824: return error;
1.12 christos 825: }
826:
827:
828: /*
1.17 christos 829: * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
1.12 christos 830: * add the new item, and update gl_pathc.
831: *
832: * This assumes the BSD realloc, which only copies the block when its size
833: * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
834: * behavior.
835: *
836: * Return 0 if new item added, error code if memory couldn't be allocated.
837: *
838: * Invariant of the glob_t structure:
839: * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
840: * gl_pathv points to (gl_offs + gl_pathc + 1) items.
841: */
842: static int
1.23.10.2! riz 843: globextend(const Char *path, glob_t *pglob, struct glob_limit *limit)
1.12 christos 844: {
845: char **pathv;
1.16 christos 846: size_t i, newsize, len;
1.12 christos 847: char *copy;
848: const Char *p;
849:
850: _DIAGASSERT(path != NULL);
851: _DIAGASSERT(pglob != NULL);
852:
853: newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
1.23.10.2! riz 854: if ((pglob->gl_flags & GLOB_LIMIT) &&
! 855: newsize > GLOB_LIMIT_PATH * sizeof(*pathv))
! 856: goto nospace;
1.12 christos 857: pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
858: malloc(newsize);
859: if (pathv == NULL)
1.18 christos 860: return GLOB_NOSPACE;
1.12 christos 861:
862: if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
863: /* first time around -- clear initial gl_offs items */
864: pathv += pglob->gl_offs;
1.16 christos 865: for (i = pglob->gl_offs + 1; --i > 0; )
1.12 christos 866: *--pathv = NULL;
867: }
868: pglob->gl_pathv = pathv;
869:
870: for (p = path; *p++;)
871: continue;
872: len = (size_t)(p - path);
1.23.10.2! riz 873: limit->l_string += len;
1.12 christos 874: if ((copy = malloc(len)) != NULL) {
875: if (g_Ctoc(path, copy, len)) {
876: free(copy);
1.18 christos 877: return GLOB_ABORTED;
1.12 christos 878: }
879: pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
880: }
881: pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
882:
1.23.10.1 riz 883: if ((pglob->gl_flags & GLOB_LIMIT) &&
1.23.10.2! riz 884: (newsize + limit->l_string) >= GLOB_LIMIT_STRING)
! 885: goto nospace;
1.12 christos 886:
1.18 christos 887: return copy == NULL ? GLOB_NOSPACE : 0;
1.23.10.2! riz 888: nospace:
! 889: errno = 0;
! 890: return GLOB_NOSPACE;
1.12 christos 891: }
892:
893:
894: /*
895: * pattern matching function for filenames. Each occurrence of the *
896: * pattern causes a recursion level.
897: */
898: static int
1.23.10.2! riz 899: match(const Char *name, const Char *pat, const Char *patend)
1.12 christos 900: {
901: int ok, negate_range;
902: Char c, k;
903:
904: _DIAGASSERT(name != NULL);
905: _DIAGASSERT(pat != NULL);
906: _DIAGASSERT(patend != NULL);
907:
908: while (pat < patend) {
909: c = *pat++;
910: switch (c & M_MASK) {
911: case M_ALL:
912: if (pat == patend)
1.18 christos 913: return 1;
1.12 christos 914: do
915: if (match(name, pat, patend))
1.18 christos 916: return 1;
1.12 christos 917: while (*name++ != EOS);
1.18 christos 918: return 0;
1.12 christos 919: case M_ONE:
920: if (*name++ == EOS)
1.18 christos 921: return 0;
1.12 christos 922: break;
923: case M_SET:
924: ok = 0;
925: if ((k = *name++) == EOS)
1.18 christos 926: return 0;
1.12 christos 927: if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
928: ++pat;
929: while (((c = *pat++) & M_MASK) != M_END)
930: if ((*pat & M_MASK) == M_RNG) {
931: if (c <= k && k <= pat[1])
932: ok = 1;
933: pat += 2;
934: } else if (c == k)
935: ok = 1;
936: if (ok == negate_range)
1.18 christos 937: return 0;
1.12 christos 938: break;
939: default:
940: if (*name++ != c)
1.18 christos 941: return 0;
1.12 christos 942: break;
943: }
944: }
1.18 christos 945: return *name == EOS;
1.12 christos 946: }
947:
948: /* Free allocated data belonging to a glob_t structure. */
949: void
1.18 christos 950: globfree(glob_t *pglob)
1.12 christos 951: {
1.16 christos 952: size_t i;
1.12 christos 953: char **pp;
954:
955: _DIAGASSERT(pglob != NULL);
956:
957: if (pglob->gl_pathv != NULL) {
958: pp = pglob->gl_pathv + pglob->gl_offs;
959: for (i = pglob->gl_pathc; i--; ++pp)
960: if (*pp)
961: free(*pp);
962: free(pglob->gl_pathv);
963: pglob->gl_pathv = NULL;
964: pglob->gl_pathc = 0;
965: }
966: }
967:
968: static DIR *
1.18 christos 969: g_opendir(Char *str, glob_t *pglob)
1.12 christos 970: {
971: char buf[MAXPATHLEN];
972:
973: _DIAGASSERT(str != NULL);
974: _DIAGASSERT(pglob != NULL);
975:
976: if (!*str)
977: (void)strlcpy(buf, ".", sizeof(buf));
978: else {
979: if (g_Ctoc(str, buf, sizeof(buf)))
980: return NULL;
981: }
982:
983: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 984: return (*pglob->gl_opendir)(buf);
1.12 christos 985:
1.18 christos 986: return opendir(buf);
1.12 christos 987: }
988:
989: static int
1.18 christos 990: g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 991: {
992: char buf[MAXPATHLEN];
993:
994: _DIAGASSERT(fn != NULL);
995: _DIAGASSERT(sb != NULL);
996: _DIAGASSERT(pglob != NULL);
997:
998: if (g_Ctoc(fn, buf, sizeof(buf)))
999: return -1;
1000: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 1001: return (*pglob->gl_lstat)(buf, sb);
1002: return lstat(buf, sb);
1.12 christos 1003: }
1004:
1005: static int
1.18 christos 1006: g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 1007: {
1008: char buf[MAXPATHLEN];
1009:
1010: _DIAGASSERT(fn != NULL);
1011: _DIAGASSERT(sb != NULL);
1012: _DIAGASSERT(pglob != NULL);
1013:
1014: if (g_Ctoc(fn, buf, sizeof(buf)))
1015: return -1;
1016: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 1017: return (*pglob->gl_stat)(buf, sb);
1018: return stat(buf, sb);
1.12 christos 1019: }
1020:
1021: static Char *
1.18 christos 1022: g_strchr(const Char *str, int ch)
1.12 christos 1023: {
1024:
1025: _DIAGASSERT(str != NULL);
1026:
1027: do {
1028: if (*str == ch)
1.14 christos 1029: return __UNCONST(str);
1.12 christos 1030: } while (*str++);
1031: return NULL;
1032: }
1033:
1034: static int
1.18 christos 1035: g_Ctoc(const Char *str, char *buf, size_t len)
1.12 christos 1036: {
1037: char *dc;
1038:
1039: _DIAGASSERT(str != NULL);
1040: _DIAGASSERT(buf != NULL);
1041:
1042: if (len == 0)
1043: return 1;
1044:
1045: for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1046: continue;
1047:
1048: return len == 0;
1049: }
1050:
1051: #ifdef DEBUG
1052: static void
1.18 christos 1053: qprintf(const char *str, Char *s)
1.12 christos 1054: {
1055: Char *p;
1056:
1057: _DIAGASSERT(str != NULL);
1058: _DIAGASSERT(s != NULL);
1059:
1060: (void)printf("%s:\n", str);
1061: for (p = s; *p; p++)
1062: (void)printf("%c", CHAR(*p));
1063: (void)printf("\n");
1064: for (p = s; *p; p++)
1065: (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1066: (void)printf("\n");
1067: for (p = s; *p; p++)
1068: (void)printf("%c", ismeta(*p) ? '_' : ' ');
1069: (void)printf("\n");
1070: }
1071: #endif
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