Annotation of src/lib/libc/gen/glob.c, Revision 1.24
1.24 ! christos 1: /* $NetBSD: glob.c,v 1.23 2008/05/26 13:06:38 ad 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
1.24 ! christos 40: __RCSID("$NetBSD: glob.c,v 1.23 2008/05/26 13:06:38 ad Exp $");
1.12 christos 41: #endif
42: #endif /* LIBC_SCCS and not lint */
1.1 cgd 43:
1.12 christos 44: /*
45: * glob(3) -- a superset of the one defined in POSIX 1003.2.
46: *
47: * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
48: *
49: * Optional extra services, controlled by flags not defined by POSIX:
50: *
51: * GLOB_MAGCHAR:
52: * Set in gl_flags if pattern contained a globbing character.
53: * GLOB_NOMAGIC:
54: * Same as GLOB_NOCHECK, but it will only append pattern if it did
55: * not contain any magic characters. [Used in csh style globbing]
56: * GLOB_ALTDIRFUNC:
57: * Use alternately specified directory access functions.
58: * GLOB_TILDE:
59: * expand ~user/foo to the /home/dir/of/user/foo
60: * GLOB_BRACE:
61: * expand {1,2}{a,b} to 1a 1b 2a 2b
1.19 christos 62: * GLOB_PERIOD:
63: * allow metacharacters to match leading dots in filenames.
1.22 christos 64: * GLOB_NO_DOTDIRS:
65: * . and .. are hidden from wildcards, even if GLOB_PERIOD is set.
1.12 christos 66: * gl_matchc:
67: * Number of matches in the current invocation of glob.
68: */
69:
70: #include "namespace.h"
71: #include <sys/param.h>
72: #include <sys/stat.h>
73:
74: #include <assert.h>
75: #include <ctype.h>
76: #include <dirent.h>
77: #include <errno.h>
78: #include <glob.h>
79: #include <pwd.h>
80: #include <stdio.h>
1.21 christos 81: #include <stddef.h>
1.12 christos 82: #include <stdlib.h>
83: #include <string.h>
84: #include <unistd.h>
85:
86: #ifdef HAVE_NBTOOL_CONFIG_H
87: #define NO_GETPW_R
88: #endif
89:
1.23 ad 90: #if !defined(ARG_MAX)
91: #include <limits.h>
92: #define ARG_MAX _POSIX_ARG_MAX
93: #endif
94:
1.12 christos 95: /*
96: * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
97: */
98: #ifndef _DIAGASSERT
99: #define _DIAGASSERT(a)
100: #endif
101:
102: #define DOLLAR '$'
103: #define DOT '.'
104: #define EOS '\0'
105: #define LBRACKET '['
106: #define NOT '!'
107: #define QUESTION '?'
108: #define QUOTE '\\'
109: #define RANGE '-'
110: #define RBRACKET ']'
111: #define SEP '/'
112: #define STAR '*'
113: #define TILDE '~'
114: #define UNDERSCORE '_'
115: #define LBRACE '{'
116: #define RBRACE '}'
117: #define SLASH '/'
118: #define COMMA ','
119:
1.15 christos 120: #ifndef USE_8BIT_CHARS
1.12 christos 121:
122: #define M_QUOTE 0x8000
123: #define M_PROTECT 0x4000
124: #define M_MASK 0xffff
125: #define M_ASCII 0x00ff
126:
127: typedef u_short Char;
128:
129: #else
130:
1.15 christos 131: #define M_QUOTE (Char)0x80
132: #define M_PROTECT (Char)0x40
133: #define M_MASK (Char)0xff
134: #define M_ASCII (Char)0x7f
1.12 christos 135:
136: typedef char Char;
137:
138: #endif
139:
140:
141: #define CHAR(c) ((Char)((c)&M_ASCII))
142: #define META(c) ((Char)((c)|M_QUOTE))
143: #define M_ALL META('*')
144: #define M_END META(']')
145: #define M_NOT META('!')
146: #define M_ONE META('?')
147: #define M_RNG META('-')
148: #define M_SET META('[')
149: #define ismeta(c) (((c)&M_QUOTE) != 0)
150:
151:
1.18 christos 152: static int compare(const void *, const void *);
153: static int g_Ctoc(const Char *, char *, size_t);
154: static int g_lstat(Char *, __gl_stat_t *, glob_t *);
155: static DIR *g_opendir(Char *, glob_t *);
156: static Char *g_strchr(const Char *, int);
157: static int g_stat(Char *, __gl_stat_t *, glob_t *);
158: static int glob0(const Char *, glob_t *);
159: static int glob1(Char *, glob_t *, size_t *);
160: static int glob2(Char *, Char *, Char *, Char *, glob_t *,
161: size_t *);
162: static int glob3(Char *, Char *, Char *, Char *, Char *, glob_t *,
163: size_t *);
164: static int globextend(const Char *, glob_t *, size_t *);
165: static const Char *globtilde(const Char *, Char *, size_t, glob_t *);
166: static int globexp1(const Char *, glob_t *);
167: static int globexp2(const Char *, const Char *, glob_t *, int *);
168: static int match(Char *, Char *, Char *);
1.12 christos 169: #ifdef DEBUG
1.18 christos 170: static void qprintf(const char *, Char *);
1.12 christos 171: #endif
172:
173: int
1.18 christos 174: glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
175: glob_t *pglob)
1.12 christos 176: {
177: const u_char *patnext;
178: int c;
179: Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
180:
181: _DIAGASSERT(pattern != NULL);
182:
183: patnext = (const u_char *) pattern;
184: if (!(flags & GLOB_APPEND)) {
185: pglob->gl_pathc = 0;
186: pglob->gl_pathv = NULL;
187: if (!(flags & GLOB_DOOFFS))
188: pglob->gl_offs = 0;
189: }
190: pglob->gl_flags = flags & ~GLOB_MAGCHAR;
191: pglob->gl_errfunc = errfunc;
192: pglob->gl_matchc = 0;
193:
194: bufnext = patbuf;
195: bufend = bufnext + MAXPATHLEN;
196: if (flags & GLOB_NOESCAPE) {
197: while (bufnext < bufend && (c = *patnext++) != EOS)
198: *bufnext++ = c;
199: } else {
200: /* Protect the quoted characters. */
201: while (bufnext < bufend && (c = *patnext++) != EOS)
202: if (c == QUOTE) {
203: if ((c = *patnext++) == EOS) {
204: c = QUOTE;
205: --patnext;
206: }
207: *bufnext++ = c | M_PROTECT;
208: }
209: else
210: *bufnext++ = c;
211: }
212: *bufnext = EOS;
213:
214: if (flags & GLOB_BRACE)
215: return globexp1(patbuf, pglob);
216: else
217: return glob0(patbuf, pglob);
218: }
219:
220: /*
221: * Expand recursively a glob {} pattern. When there is no more expansion
222: * invoke the standard globbing routine to glob the rest of the magic
223: * characters
224: */
225: static int
1.18 christos 226: globexp1(const Char *pattern, glob_t *pglob)
1.12 christos 227: {
228: const Char* ptr = pattern;
229: int rv;
230:
231: _DIAGASSERT(pattern != NULL);
232: _DIAGASSERT(pglob != NULL);
233:
234: /* Protect a single {}, for find(1), like csh */
235: if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
236: return glob0(pattern, pglob);
237:
238: while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
239: if (!globexp2(ptr, pattern, pglob, &rv))
240: return rv;
241:
242: return glob0(pattern, pglob);
243: }
244:
245:
246: /*
247: * Recursive brace globbing helper. Tries to expand a single brace.
248: * If it succeeds then it invokes globexp1 with the new pattern.
249: * If it fails then it tries to glob the rest of the pattern and returns.
250: */
251: static int
1.18 christos 252: globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv)
1.12 christos 253: {
254: int i;
255: Char *lm, *ls;
256: const Char *pe, *pm, *pl;
257: Char patbuf[MAXPATHLEN + 1];
258:
259: _DIAGASSERT(ptr != NULL);
260: _DIAGASSERT(pattern != NULL);
261: _DIAGASSERT(pglob != NULL);
262: _DIAGASSERT(rv != NULL);
263:
264: /* copy part up to the brace */
265: for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
266: continue;
267: ls = lm;
268:
269: /* Find the balanced brace */
270: for (i = 0, pe = ++ptr; *pe; pe++)
271: if (*pe == LBRACKET) {
272: /* Ignore everything between [] */
273: for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
274: continue;
275: if (*pe == EOS) {
276: /*
277: * We could not find a matching RBRACKET.
278: * Ignore and just look for RBRACE
279: */
280: pe = pm;
281: }
282: }
283: else if (*pe == LBRACE)
284: i++;
285: else if (*pe == RBRACE) {
286: if (i == 0)
287: break;
288: i--;
289: }
290:
291: /* Non matching braces; just glob the pattern */
292: if (i != 0 || *pe == EOS) {
293: /*
294: * we use `pattern', not `patbuf' here so that that
295: * unbalanced braces are passed to the match
296: */
297: *rv = glob0(pattern, pglob);
298: return 0;
299: }
300:
301: for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
302: switch (*pm) {
303: case LBRACKET:
304: /* Ignore everything between [] */
305: for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
306: continue;
307: if (*pm == EOS) {
308: /*
309: * We could not find a matching RBRACKET.
310: * Ignore and just look for RBRACE
311: */
312: pm = pl;
313: }
314: break;
315:
316: case LBRACE:
317: i++;
318: break;
319:
320: case RBRACE:
321: if (i) {
322: i--;
323: break;
324: }
325: /* FALLTHROUGH */
326: case COMMA:
327: if (i && *pm == COMMA)
328: break;
329: else {
330: /* Append the current string */
331: for (lm = ls; (pl < pm); *lm++ = *pl++)
332: continue;
333: /*
334: * Append the rest of the pattern after the
335: * closing brace
336: */
337: for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
338: continue;
339:
340: /* Expand the current pattern */
341: #ifdef DEBUG
342: qprintf("globexp2:", patbuf);
343: #endif
344: *rv = globexp1(patbuf, pglob);
345:
346: /* move after the comma, to the next string */
347: pl = pm + 1;
348: }
349: break;
350:
351: default:
352: break;
353: }
354: }
355: *rv = 0;
356: return 0;
357: }
358:
359:
360:
361: /*
362: * expand tilde from the passwd file.
363: */
364: static const Char *
1.18 christos 365: globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
1.12 christos 366: {
367: struct passwd *pwd;
368: const char *h;
369: const Char *p;
370: Char *b;
371: char *d;
372: Char *pend = &patbuf[patsize / sizeof(Char)];
373: #ifndef NO_GETPW_R
374: struct passwd pwres;
375: char pwbuf[1024];
376: #endif
377:
378: pend--;
379:
380: _DIAGASSERT(pattern != NULL);
381: _DIAGASSERT(patbuf != NULL);
382: _DIAGASSERT(pglob != NULL);
383:
384: if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
385: return pattern;
386:
387: /* Copy up to the end of the string or / */
388: for (p = pattern + 1, d = (char *)(void *)patbuf;
389: d < (char *)(void *)pend && *p && *p != SLASH;
390: *d++ = *p++)
391: continue;
392:
393: if (d == (char *)(void *)pend)
394: return NULL;
395:
396: *d = EOS;
397: d = (char *)(void *)patbuf;
398:
399: if (*d == EOS) {
400: /*
401: * handle a plain ~ or ~/ by expanding $HOME
402: * first and then trying the password file
403: */
404: if ((h = getenv("HOME")) == NULL) {
405: #ifdef NO_GETPW_R
406: if ((pwd = getpwuid(getuid())) == NULL)
407: #else
408: if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
409: &pwd) != 0 || pwd == NULL)
410: #endif
411: return pattern;
412: else
413: h = pwd->pw_dir;
414: }
415: }
416: else {
417: /*
418: * Expand a ~user
419: */
420: #ifdef NO_GETPW_R
421: if ((pwd = getpwnam(d)) == NULL)
422: #else
423: if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
424: pwd == NULL)
425: #endif
426: return pattern;
427: else
428: h = pwd->pw_dir;
429: }
430:
431: /* Copy the home directory */
432: for (b = patbuf; b < pend && *h; *b++ = *h++)
433: continue;
434:
435: if (b == pend)
436: return NULL;
437:
438: /* Append the rest of the pattern */
439: while (b < pend && (*b++ = *p++) != EOS)
440: continue;
441:
442: if (b == pend)
443: return NULL;
444:
445: return patbuf;
446: }
447:
448:
449: /*
450: * The main glob() routine: compiles the pattern (optionally processing
451: * quotes), calls glob1() to do the real pattern matching, and finally
452: * sorts the list (unless unsorted operation is requested). Returns 0
453: * if things went well, nonzero if errors occurred. It is not an error
454: * to find no matches.
455: */
456: static int
1.18 christos 457: glob0(const Char *pattern, glob_t *pglob)
1.12 christos 458: {
459: const Char *qpatnext;
1.16 christos 460: int c, error;
461: __gl_size_t oldpathc;
1.12 christos 462: Char *bufnext, patbuf[MAXPATHLEN+1];
463: size_t limit = 0;
464:
465: _DIAGASSERT(pattern != NULL);
466: _DIAGASSERT(pglob != NULL);
467:
468: if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
469: pglob)) == NULL)
470: return GLOB_ABEND;
471: oldpathc = pglob->gl_pathc;
472: bufnext = patbuf;
473:
474: /* We don't need to check for buffer overflow any more. */
475: while ((c = *qpatnext++) != EOS) {
476: switch (c) {
477: case LBRACKET:
478: c = *qpatnext;
479: if (c == NOT)
480: ++qpatnext;
481: if (*qpatnext == EOS ||
482: g_strchr(qpatnext+1, RBRACKET) == NULL) {
483: *bufnext++ = LBRACKET;
484: if (c == NOT)
485: --qpatnext;
486: break;
487: }
488: *bufnext++ = M_SET;
489: if (c == NOT)
490: *bufnext++ = M_NOT;
491: c = *qpatnext++;
492: do {
493: *bufnext++ = CHAR(c);
494: if (*qpatnext == RANGE &&
495: (c = qpatnext[1]) != RBRACKET) {
496: *bufnext++ = M_RNG;
497: *bufnext++ = CHAR(c);
498: qpatnext += 2;
499: }
500: } while ((c = *qpatnext++) != RBRACKET);
501: pglob->gl_flags |= GLOB_MAGCHAR;
502: *bufnext++ = M_END;
503: break;
504: case QUESTION:
505: pglob->gl_flags |= GLOB_MAGCHAR;
506: *bufnext++ = M_ONE;
507: break;
508: case STAR:
509: pglob->gl_flags |= GLOB_MAGCHAR;
510: /* collapse adjacent stars to one,
511: * to avoid exponential behavior
512: */
513: if (bufnext == patbuf || bufnext[-1] != M_ALL)
514: *bufnext++ = M_ALL;
515: break;
516: default:
517: *bufnext++ = CHAR(c);
518: break;
519: }
520: }
521: *bufnext = EOS;
522: #ifdef DEBUG
523: qprintf("glob0:", patbuf);
524: #endif
525:
526: if ((error = glob1(patbuf, pglob, &limit)) != 0)
1.18 christos 527: return error;
1.12 christos 528:
529: if (pglob->gl_pathc == oldpathc) {
530: /*
531: * If there was no match we are going to append the pattern
532: * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
533: * specified and the pattern did not contain any magic
534: * characters GLOB_NOMAGIC is there just for compatibility
535: * with csh.
536: */
537: if ((pglob->gl_flags & GLOB_NOCHECK) ||
538: ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
539: == GLOB_NOMAGIC)) {
540: return globextend(pattern, pglob, &limit);
541: } else {
1.18 christos 542: return GLOB_NOMATCH;
1.12 christos 543: }
544: } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
545: qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
546: (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
547: compare);
548: }
549:
1.18 christos 550: return 0;
1.12 christos 551: }
552:
553: static int
1.18 christos 554: compare(const void *p, const void *q)
1.12 christos 555: {
556:
557: _DIAGASSERT(p != NULL);
558: _DIAGASSERT(q != NULL);
559:
1.18 christos 560: return strcoll(*(const char * const *)p, *(const char * const *)q);
1.12 christos 561: }
562:
563: static int
1.18 christos 564: glob1(Char *pattern, glob_t *pglob, size_t *limit)
1.12 christos 565: {
566: Char pathbuf[MAXPATHLEN+1];
567:
568: _DIAGASSERT(pattern != NULL);
569: _DIAGASSERT(pglob != NULL);
570:
571: /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
572: if (*pattern == EOS)
1.18 christos 573: return 0;
1.12 christos 574: /*
575: * we save one character so that we can use ptr >= limit,
576: * in the general case when we are appending non nul chars only.
577: */
1.18 christos 578: return glob2(pathbuf, pathbuf,
579: pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
580: pglob, limit);
1.12 christos 581: }
582:
583: /*
584: * The functions glob2 and glob3 are mutually recursive; there is one level
585: * of recursion for each segment in the pattern that contains one or more
586: * meta characters.
587: */
588: static int
1.18 christos 589: glob2(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern, glob_t *pglob,
590: size_t *limit)
1.12 christos 591: {
592: __gl_stat_t sb;
593: Char *p, *q;
594: int anymeta;
1.21 christos 595: Char *pend;
596: ptrdiff_t diff;
1.12 christos 597:
598: _DIAGASSERT(pathbuf != NULL);
599: _DIAGASSERT(pathend != NULL);
600: _DIAGASSERT(pattern != NULL);
601: _DIAGASSERT(pglob != NULL);
602:
603: /*
604: * Loop over pattern segments until end of pattern or until
605: * segment with meta character found.
606: */
607: for (anymeta = 0;;) {
608: if (*pattern == EOS) { /* End of pattern? */
609: *pathend = EOS;
610: if (g_lstat(pathbuf, &sb, pglob))
1.18 christos 611: return 0;
1.12 christos 612:
613: if (((pglob->gl_flags & GLOB_MARK) &&
614: pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
615: (S_ISLNK(sb.st_mode) &&
616: (g_stat(pathbuf, &sb, pglob) == 0) &&
617: S_ISDIR(sb.st_mode)))) {
618: if (pathend >= pathlim)
1.18 christos 619: return GLOB_ABORTED;
1.12 christos 620: *pathend++ = SEP;
621: *pathend = EOS;
622: }
623: ++pglob->gl_matchc;
1.18 christos 624: return globextend(pathbuf, pglob, limit);
1.12 christos 625: }
626:
627: /* Find end of next segment, copy tentatively to pathend. */
628: q = pathend;
629: p = pattern;
630: while (*p != EOS && *p != SEP) {
631: if (ismeta(*p))
632: anymeta = 1;
633: if (q >= pathlim)
634: return GLOB_ABORTED;
635: *q++ = *p++;
636: }
637:
1.20 christos 638: /*
1.21 christos 639: * No expansion, or path ends in slash-dot shash-dot-dot,
1.20 christos 640: * do next segment.
641: */
1.21 christos 642: if (pglob->gl_flags & GLOB_PERIOD) {
643: for (pend = pathend; pend > pathbuf && pend[-1] == '/';
644: pend--)
645: continue;
646: diff = pend - pathbuf;
647: } else {
648: /* XXX: GCC */
649: diff = 0;
650: pend = pathend;
651: }
652:
653: if ((!anymeta) ||
654: ((pglob->gl_flags & GLOB_PERIOD) &&
655: (diff >= 1 && pend[-1] == DOT) &&
656: (diff >= 2 && (pend[-2] == SLASH || pend[-2] == DOT)) &&
657: (diff < 3 || pend[-3] == SLASH))) {
1.12 christos 658: pathend = q;
659: pattern = p;
660: while (*pattern == SEP) {
661: if (pathend >= pathlim)
662: return GLOB_ABORTED;
663: *pathend++ = *pattern++;
664: }
665: } else /* Need expansion, recurse. */
1.18 christos 666: return glob3(pathbuf, pathend, pathlim, pattern, p,
667: pglob, limit);
1.12 christos 668: }
669: /* NOTREACHED */
670: }
671:
672: static int
1.18 christos 673: glob3(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern,
674: Char *restpattern, glob_t *pglob, size_t *limit)
1.12 christos 675: {
676: struct dirent *dp;
677: DIR *dirp;
678: int error;
679: char buf[MAXPATHLEN];
680:
681: /*
682: * The readdirfunc declaration can't be prototyped, because it is
683: * assigned, below, to two functions which are prototyped in glob.h
684: * and dirent.h as taking pointers to differently typed opaque
685: * structures.
686: */
1.18 christos 687: struct dirent *(*readdirfunc)(void *);
1.12 christos 688:
689: _DIAGASSERT(pathbuf != NULL);
690: _DIAGASSERT(pathend != NULL);
691: _DIAGASSERT(pattern != NULL);
692: _DIAGASSERT(restpattern != NULL);
693: _DIAGASSERT(pglob != NULL);
694:
695: *pathend = EOS;
696: errno = 0;
697:
698: if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
699: if (pglob->gl_errfunc) {
700: if (g_Ctoc(pathbuf, buf, sizeof(buf)))
1.18 christos 701: return GLOB_ABORTED;
1.12 christos 702: if (pglob->gl_errfunc(buf, errno) ||
703: pglob->gl_flags & GLOB_ERR)
1.18 christos 704: return GLOB_ABORTED;
1.12 christos 705: }
706: /*
707: * Posix/XOpen: glob should return when it encounters a
708: * directory that it cannot open or read
709: * XXX: Should we ignore ENOTDIR and ENOENT though?
710: * I think that Posix had in mind EPERM...
711: */
712: if (pglob->gl_flags & GLOB_ERR)
1.18 christos 713: return GLOB_ABORTED;
1.12 christos 714:
1.18 christos 715: return 0;
1.12 christos 716: }
717:
718: error = 0;
719:
720: /* Search directory for matching names. */
721: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
722: readdirfunc = pglob->gl_readdir;
723: else
724: readdirfunc = (struct dirent *(*)__P((void *))) readdir;
725: while ((dp = (*readdirfunc)(dirp)) != NULL) {
726: u_char *sc;
727: Char *dc;
728:
1.19 christos 729: /*
730: * Initial DOT must be matched literally, unless we have
731: * GLOB_PERIOD set.
732: */
733: if ((pglob->gl_flags & GLOB_PERIOD) == 0)
734: if (dp->d_name[0] == DOT && *pattern != DOT)
735: continue;
1.12 christos 736: /*
1.22 christos 737: * If GLOB_NO_DOTDIRS is set, . and .. vanish.
738: */
739: if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
740: (dp->d_name[0] == DOT) &&
741: ((dp->d_name[1] == EOS) ||
742: ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
743: continue;
744: /*
1.12 christos 745: * The resulting string contains EOS, so we can
746: * use the pathlim character, if it is the nul
747: */
748: for (sc = (u_char *) dp->d_name, dc = pathend;
749: dc <= pathlim && (*dc++ = *sc++) != EOS;)
750: continue;
751:
752: /*
753: * Have we filled the buffer without seeing EOS?
754: */
755: if (dc > pathlim && *pathlim != EOS) {
756: /*
757: * Abort when requested by caller, otherwise
758: * reset pathend back to last SEP and continue
759: * with next dir entry.
760: */
761: if (pglob->gl_flags & GLOB_ERR) {
762: error = GLOB_ABORTED;
763: break;
764: }
765: else {
766: *pathend = EOS;
767: continue;
768: }
769: }
770:
771: if (!match(pathend, pattern, restpattern)) {
772: *pathend = EOS;
773: continue;
774: }
775: error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit);
776: if (error)
777: break;
778: }
779:
780: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
781: (*pglob->gl_closedir)(dirp);
782: else
783: closedir(dirp);
784:
785: /*
786: * Again Posix X/Open issue with regards to error handling.
787: */
788: if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
1.18 christos 789: return GLOB_ABORTED;
1.12 christos 790:
1.18 christos 791: return error;
1.12 christos 792: }
793:
794:
795: /*
1.17 christos 796: * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
1.12 christos 797: * add the new item, and update gl_pathc.
798: *
799: * This assumes the BSD realloc, which only copies the block when its size
800: * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
801: * behavior.
802: *
803: * Return 0 if new item added, error code if memory couldn't be allocated.
804: *
805: * Invariant of the glob_t structure:
806: * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
807: * gl_pathv points to (gl_offs + gl_pathc + 1) items.
808: */
809: static int
1.18 christos 810: globextend(const Char *path, glob_t *pglob, size_t *limit)
1.12 christos 811: {
812: char **pathv;
1.16 christos 813: size_t i, newsize, len;
1.12 christos 814: char *copy;
815: const Char *p;
816:
817: _DIAGASSERT(path != NULL);
818: _DIAGASSERT(pglob != NULL);
819:
820: newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
821: pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
822: malloc(newsize);
823: if (pathv == NULL)
1.18 christos 824: return GLOB_NOSPACE;
1.12 christos 825:
826: if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
827: /* first time around -- clear initial gl_offs items */
828: pathv += pglob->gl_offs;
1.16 christos 829: for (i = pglob->gl_offs + 1; --i > 0; )
1.12 christos 830: *--pathv = NULL;
831: }
832: pglob->gl_pathv = pathv;
833:
834: for (p = path; *p++;)
835: continue;
836: len = (size_t)(p - path);
837: *limit += len;
838: if ((copy = malloc(len)) != NULL) {
839: if (g_Ctoc(path, copy, len)) {
840: free(copy);
1.18 christos 841: return GLOB_ABORTED;
1.12 christos 842: }
843: pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
844: }
845: pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
846:
847: if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
848: errno = 0;
1.18 christos 849: return GLOB_NOSPACE;
1.12 christos 850: }
851:
1.18 christos 852: return copy == NULL ? GLOB_NOSPACE : 0;
1.12 christos 853: }
854:
855:
856: /*
857: * pattern matching function for filenames. Each occurrence of the *
858: * pattern causes a recursion level.
859: */
860: static int
1.18 christos 861: match(Char *name, Char *pat, Char *patend)
1.12 christos 862: {
863: int ok, negate_range;
864: Char c, k;
865:
866: _DIAGASSERT(name != NULL);
867: _DIAGASSERT(pat != NULL);
868: _DIAGASSERT(patend != NULL);
869:
870: while (pat < patend) {
871: c = *pat++;
872: switch (c & M_MASK) {
873: case M_ALL:
874: if (pat == patend)
1.18 christos 875: return 1;
1.12 christos 876: do
877: if (match(name, pat, patend))
1.18 christos 878: return 1;
1.12 christos 879: while (*name++ != EOS);
1.18 christos 880: return 0;
1.12 christos 881: case M_ONE:
882: if (*name++ == EOS)
1.18 christos 883: return 0;
1.12 christos 884: break;
885: case M_SET:
886: ok = 0;
887: if ((k = *name++) == EOS)
1.18 christos 888: return 0;
1.12 christos 889: if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
890: ++pat;
891: while (((c = *pat++) & M_MASK) != M_END)
892: if ((*pat & M_MASK) == M_RNG) {
893: if (c <= k && k <= pat[1])
894: ok = 1;
895: pat += 2;
896: } else if (c == k)
897: ok = 1;
898: if (ok == negate_range)
1.18 christos 899: return 0;
1.12 christos 900: break;
901: default:
902: if (*name++ != c)
1.18 christos 903: return 0;
1.12 christos 904: break;
905: }
906: }
1.18 christos 907: return *name == EOS;
1.12 christos 908: }
909:
910: /* Free allocated data belonging to a glob_t structure. */
911: void
1.18 christos 912: globfree(glob_t *pglob)
1.12 christos 913: {
1.16 christos 914: size_t i;
1.12 christos 915: char **pp;
916:
917: _DIAGASSERT(pglob != NULL);
918:
919: if (pglob->gl_pathv != NULL) {
920: pp = pglob->gl_pathv + pglob->gl_offs;
921: for (i = pglob->gl_pathc; i--; ++pp)
922: if (*pp)
923: free(*pp);
924: free(pglob->gl_pathv);
925: pglob->gl_pathv = NULL;
926: pglob->gl_pathc = 0;
927: }
928: }
929:
1.24 ! christos 930: #ifndef __LIBC12_SOURCE__
! 931: int
! 932: glob_pattern_p(const char *pattern, int quote)
! 933: {
! 934: int range = 0;
! 935:
! 936: for (; *pattern; pattern++)
! 937: switch (*pattern) {
! 938: case QUESTION:
! 939: case STAR:
! 940: return 1;
! 941:
! 942: case QUOTE:
! 943: if (quote && pattern[1] != '\0')
! 944: ++pattern;
! 945: break;
! 946:
! 947: case LBRACKET:
! 948: range = 1;
! 949: break;
! 950:
! 951: case RBRACKET:
! 952: if (range)
! 953: return 1;
! 954: break;
! 955: default:
! 956: break;
! 957: }
! 958:
! 959: return 0;
! 960: }
! 961: #endif
! 962:
1.12 christos 963: static DIR *
1.18 christos 964: g_opendir(Char *str, glob_t *pglob)
1.12 christos 965: {
966: char buf[MAXPATHLEN];
967:
968: _DIAGASSERT(str != NULL);
969: _DIAGASSERT(pglob != NULL);
970:
971: if (!*str)
972: (void)strlcpy(buf, ".", sizeof(buf));
973: else {
974: if (g_Ctoc(str, buf, sizeof(buf)))
975: return NULL;
976: }
977:
978: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 979: return (*pglob->gl_opendir)(buf);
1.12 christos 980:
1.18 christos 981: return opendir(buf);
1.12 christos 982: }
983:
984: static int
1.18 christos 985: g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 986: {
987: char buf[MAXPATHLEN];
988:
989: _DIAGASSERT(fn != NULL);
990: _DIAGASSERT(sb != NULL);
991: _DIAGASSERT(pglob != NULL);
992:
993: if (g_Ctoc(fn, buf, sizeof(buf)))
994: return -1;
995: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 996: return (*pglob->gl_lstat)(buf, sb);
997: return lstat(buf, sb);
1.12 christos 998: }
999:
1000: static int
1.18 christos 1001: g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 1002: {
1003: char buf[MAXPATHLEN];
1004:
1005: _DIAGASSERT(fn != NULL);
1006: _DIAGASSERT(sb != NULL);
1007: _DIAGASSERT(pglob != NULL);
1008:
1009: if (g_Ctoc(fn, buf, sizeof(buf)))
1010: return -1;
1011: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 1012: return (*pglob->gl_stat)(buf, sb);
1013: return stat(buf, sb);
1.12 christos 1014: }
1015:
1016: static Char *
1.18 christos 1017: g_strchr(const Char *str, int ch)
1.12 christos 1018: {
1019:
1020: _DIAGASSERT(str != NULL);
1021:
1022: do {
1023: if (*str == ch)
1.14 christos 1024: return __UNCONST(str);
1.12 christos 1025: } while (*str++);
1026: return NULL;
1027: }
1028:
1029: static int
1.18 christos 1030: g_Ctoc(const Char *str, char *buf, size_t len)
1.12 christos 1031: {
1032: char *dc;
1033:
1034: _DIAGASSERT(str != NULL);
1035: _DIAGASSERT(buf != NULL);
1036:
1037: if (len == 0)
1038: return 1;
1039:
1040: for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1041: continue;
1042:
1043: return len == 0;
1044: }
1045:
1046: #ifdef DEBUG
1047: static void
1.18 christos 1048: qprintf(const char *str, Char *s)
1.12 christos 1049: {
1050: Char *p;
1051:
1052: _DIAGASSERT(str != NULL);
1053: _DIAGASSERT(s != NULL);
1054:
1055: (void)printf("%s:\n", str);
1056: for (p = s; *p; p++)
1057: (void)printf("%c", CHAR(*p));
1058: (void)printf("\n");
1059: for (p = s; *p; p++)
1060: (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1061: (void)printf("\n");
1062: for (p = s; *p; p++)
1063: (void)printf("%c", ismeta(*p) ? '_' : ' ');
1064: (void)printf("\n");
1065: }
1066: #endif
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