Annotation of src/lib/libc/gen/glob.c, Revision 1.25
1.25 ! christos 1: /* $NetBSD: glob.c,v 1.24 2009/04/08 16:28:50 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
1.25 ! christos 40: __RCSID("$NetBSD: glob.c,v 1.24 2009/04/08 16:28:50 christos 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 *);
1.25 ! christos 158: static int glob0(const Char *, glob_t *, size_t *);
1.18 christos 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 *);
1.25 ! christos 166: static int globexp1(const Char *, glob_t *, size_t *);
! 167: static int globexp2(const Char *, const Char *, glob_t *, int *,
! 168: size_t *);
1.18 christos 169: static int match(Char *, Char *, Char *);
1.12 christos 170: #ifdef DEBUG
1.18 christos 171: static void qprintf(const char *, Char *);
1.12 christos 172: #endif
173:
174: int
1.18 christos 175: glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
176: glob_t *pglob)
1.12 christos 177: {
178: const u_char *patnext;
179: int c;
180: Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
1.25 ! christos 181: size_t limit = 0;
1.12 christos 182:
183: _DIAGASSERT(pattern != NULL);
184:
185: patnext = (const u_char *) pattern;
186: if (!(flags & GLOB_APPEND)) {
187: pglob->gl_pathc = 0;
188: pglob->gl_pathv = NULL;
189: if (!(flags & GLOB_DOOFFS))
190: pglob->gl_offs = 0;
191: }
192: pglob->gl_flags = flags & ~GLOB_MAGCHAR;
193: pglob->gl_errfunc = errfunc;
194: pglob->gl_matchc = 0;
195:
196: bufnext = patbuf;
197: bufend = bufnext + MAXPATHLEN;
198: if (flags & GLOB_NOESCAPE) {
199: while (bufnext < bufend && (c = *patnext++) != EOS)
200: *bufnext++ = c;
201: } else {
202: /* Protect the quoted characters. */
203: while (bufnext < bufend && (c = *patnext++) != EOS)
204: if (c == QUOTE) {
205: if ((c = *patnext++) == EOS) {
206: c = QUOTE;
207: --patnext;
208: }
209: *bufnext++ = c | M_PROTECT;
210: }
211: else
212: *bufnext++ = c;
213: }
214: *bufnext = EOS;
215:
216: if (flags & GLOB_BRACE)
1.25 ! christos 217: return globexp1(patbuf, pglob, &limit);
1.12 christos 218: else
1.25 ! christos 219: return glob0(patbuf, pglob, &limit);
1.12 christos 220: }
221:
222: /*
223: * Expand recursively a glob {} pattern. When there is no more expansion
224: * invoke the standard globbing routine to glob the rest of the magic
225: * characters
226: */
227: static int
1.25 ! christos 228: globexp1(const Char *pattern, glob_t *pglob, size_t *limit)
1.12 christos 229: {
230: const Char* ptr = pattern;
231: int rv;
232:
233: _DIAGASSERT(pattern != NULL);
234: _DIAGASSERT(pglob != NULL);
235:
236: /* Protect a single {}, for find(1), like csh */
237: if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
1.25 ! christos 238: return glob0(pattern, pglob, limit);
1.12 christos 239:
240: while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
1.25 ! christos 241: if (!globexp2(ptr, pattern, pglob, &rv, limit))
1.12 christos 242: return rv;
243:
1.25 ! christos 244: return glob0(pattern, pglob, limit);
1.12 christos 245: }
246:
247:
248: /*
249: * Recursive brace globbing helper. Tries to expand a single brace.
250: * If it succeeds then it invokes globexp1 with the new pattern.
251: * If it fails then it tries to glob the rest of the pattern and returns.
252: */
253: static int
1.25 ! christos 254: globexp2(const Char *ptr, const Char *pattern, glob_t *pglob, int *rv,
! 255: size_t *limit)
1.12 christos 256: {
257: int i;
258: Char *lm, *ls;
259: const Char *pe, *pm, *pl;
260: Char patbuf[MAXPATHLEN + 1];
261:
262: _DIAGASSERT(ptr != NULL);
263: _DIAGASSERT(pattern != NULL);
264: _DIAGASSERT(pglob != NULL);
265: _DIAGASSERT(rv != NULL);
266:
267: /* copy part up to the brace */
268: for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
269: continue;
270: ls = lm;
271:
272: /* Find the balanced brace */
273: for (i = 0, pe = ++ptr; *pe; pe++)
274: if (*pe == LBRACKET) {
275: /* Ignore everything between [] */
276: for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
277: continue;
278: if (*pe == EOS) {
279: /*
280: * We could not find a matching RBRACKET.
281: * Ignore and just look for RBRACE
282: */
283: pe = pm;
284: }
285: }
286: else if (*pe == LBRACE)
287: i++;
288: else if (*pe == RBRACE) {
289: if (i == 0)
290: break;
291: i--;
292: }
293:
294: /* Non matching braces; just glob the pattern */
295: if (i != 0 || *pe == EOS) {
296: /*
297: * we use `pattern', not `patbuf' here so that that
298: * unbalanced braces are passed to the match
299: */
1.25 ! christos 300: *rv = glob0(pattern, pglob, limit);
1.12 christos 301: return 0;
302: }
303:
304: for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
305: switch (*pm) {
306: case LBRACKET:
307: /* Ignore everything between [] */
308: for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
309: continue;
310: if (*pm == EOS) {
311: /*
312: * We could not find a matching RBRACKET.
313: * Ignore and just look for RBRACE
314: */
315: pm = pl;
316: }
317: break;
318:
319: case LBRACE:
320: i++;
321: break;
322:
323: case RBRACE:
324: if (i) {
325: i--;
326: break;
327: }
328: /* FALLTHROUGH */
329: case COMMA:
330: if (i && *pm == COMMA)
331: break;
332: else {
333: /* Append the current string */
334: for (lm = ls; (pl < pm); *lm++ = *pl++)
335: continue;
336: /*
337: * Append the rest of the pattern after the
338: * closing brace
339: */
340: for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
341: continue;
342:
343: /* Expand the current pattern */
344: #ifdef DEBUG
345: qprintf("globexp2:", patbuf);
346: #endif
1.25 ! christos 347: *rv = globexp1(patbuf, pglob, limit);
1.12 christos 348:
349: /* move after the comma, to the next string */
350: pl = pm + 1;
351: }
352: break;
353:
354: default:
355: break;
356: }
357: }
358: *rv = 0;
359: return 0;
360: }
361:
362:
363:
364: /*
365: * expand tilde from the passwd file.
366: */
367: static const Char *
1.18 christos 368: globtilde(const Char *pattern, Char *patbuf, size_t patsize, glob_t *pglob)
1.12 christos 369: {
370: struct passwd *pwd;
371: const char *h;
372: const Char *p;
373: Char *b;
374: char *d;
375: Char *pend = &patbuf[patsize / sizeof(Char)];
376: #ifndef NO_GETPW_R
377: struct passwd pwres;
378: char pwbuf[1024];
379: #endif
380:
381: pend--;
382:
383: _DIAGASSERT(pattern != NULL);
384: _DIAGASSERT(patbuf != NULL);
385: _DIAGASSERT(pglob != NULL);
386:
387: if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
388: return pattern;
389:
390: /* Copy up to the end of the string or / */
391: for (p = pattern + 1, d = (char *)(void *)patbuf;
392: d < (char *)(void *)pend && *p && *p != SLASH;
393: *d++ = *p++)
394: continue;
395:
396: if (d == (char *)(void *)pend)
397: return NULL;
398:
399: *d = EOS;
400: d = (char *)(void *)patbuf;
401:
402: if (*d == EOS) {
403: /*
404: * handle a plain ~ or ~/ by expanding $HOME
405: * first and then trying the password file
406: */
407: if ((h = getenv("HOME")) == NULL) {
408: #ifdef NO_GETPW_R
409: if ((pwd = getpwuid(getuid())) == NULL)
410: #else
411: if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
412: &pwd) != 0 || pwd == NULL)
413: #endif
414: return pattern;
415: else
416: h = pwd->pw_dir;
417: }
418: }
419: else {
420: /*
421: * Expand a ~user
422: */
423: #ifdef NO_GETPW_R
424: if ((pwd = getpwnam(d)) == NULL)
425: #else
426: if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
427: pwd == NULL)
428: #endif
429: return pattern;
430: else
431: h = pwd->pw_dir;
432: }
433:
434: /* Copy the home directory */
435: for (b = patbuf; b < pend && *h; *b++ = *h++)
436: continue;
437:
438: if (b == pend)
439: return NULL;
440:
441: /* Append the rest of the pattern */
442: while (b < pend && (*b++ = *p++) != EOS)
443: continue;
444:
445: if (b == pend)
446: return NULL;
447:
448: return patbuf;
449: }
450:
451:
452: /*
453: * The main glob() routine: compiles the pattern (optionally processing
454: * quotes), calls glob1() to do the real pattern matching, and finally
455: * sorts the list (unless unsorted operation is requested). Returns 0
456: * if things went well, nonzero if errors occurred. It is not an error
457: * to find no matches.
458: */
459: static int
1.25 ! christos 460: glob0(const Char *pattern, glob_t *pglob, size_t *limit)
1.12 christos 461: {
462: const Char *qpatnext;
1.16 christos 463: int c, error;
464: __gl_size_t oldpathc;
1.12 christos 465: Char *bufnext, patbuf[MAXPATHLEN+1];
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:
1.25 ! christos 528: if ((error = glob1(patbuf, pglob, limit)) != 0)
1.18 christos 529: return error;
1.12 christos 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)) {
1.25 ! christos 542: return globextend(pattern, pglob, limit);
1.12 christos 543: } else {
1.18 christos 544: return GLOB_NOMATCH;
1.12 christos 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:
1.18 christos 552: return 0;
1.12 christos 553: }
554:
555: static int
1.18 christos 556: compare(const void *p, const void *q)
1.12 christos 557: {
558:
559: _DIAGASSERT(p != NULL);
560: _DIAGASSERT(q != NULL);
561:
1.18 christos 562: return strcoll(*(const char * const *)p, *(const char * const *)q);
1.12 christos 563: }
564:
565: static int
1.18 christos 566: glob1(Char *pattern, glob_t *pglob, size_t *limit)
1.12 christos 567: {
568: Char pathbuf[MAXPATHLEN+1];
569:
570: _DIAGASSERT(pattern != NULL);
571: _DIAGASSERT(pglob != NULL);
572:
573: /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
574: if (*pattern == EOS)
1.18 christos 575: return 0;
1.12 christos 576: /*
577: * we save one character so that we can use ptr >= limit,
578: * in the general case when we are appending non nul chars only.
579: */
1.18 christos 580: return glob2(pathbuf, pathbuf,
581: pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1, pattern,
582: pglob, limit);
1.12 christos 583: }
584:
585: /*
586: * The functions glob2 and glob3 are mutually recursive; there is one level
587: * of recursion for each segment in the pattern that contains one or more
588: * meta characters.
589: */
590: static int
1.18 christos 591: glob2(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern, glob_t *pglob,
592: size_t *limit)
1.12 christos 593: {
594: __gl_stat_t sb;
595: Char *p, *q;
596: int anymeta;
1.21 christos 597: Char *pend;
598: ptrdiff_t diff;
1.12 christos 599:
600: _DIAGASSERT(pathbuf != NULL);
601: _DIAGASSERT(pathend != NULL);
602: _DIAGASSERT(pattern != NULL);
603: _DIAGASSERT(pglob != NULL);
604:
605: /*
606: * Loop over pattern segments until end of pattern or until
607: * segment with meta character found.
608: */
609: for (anymeta = 0;;) {
610: if (*pattern == EOS) { /* End of pattern? */
611: *pathend = EOS;
612: if (g_lstat(pathbuf, &sb, pglob))
1.18 christos 613: return 0;
1.12 christos 614:
615: if (((pglob->gl_flags & GLOB_MARK) &&
616: pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
617: (S_ISLNK(sb.st_mode) &&
618: (g_stat(pathbuf, &sb, pglob) == 0) &&
619: S_ISDIR(sb.st_mode)))) {
620: if (pathend >= pathlim)
1.18 christos 621: return GLOB_ABORTED;
1.12 christos 622: *pathend++ = SEP;
623: *pathend = EOS;
624: }
625: ++pglob->gl_matchc;
1.18 christos 626: return globextend(pathbuf, pglob, limit);
1.12 christos 627: }
628:
629: /* Find end of next segment, copy tentatively to pathend. */
630: q = pathend;
631: p = pattern;
632: while (*p != EOS && *p != SEP) {
633: if (ismeta(*p))
634: anymeta = 1;
635: if (q >= pathlim)
636: return GLOB_ABORTED;
637: *q++ = *p++;
638: }
639:
1.20 christos 640: /*
1.21 christos 641: * No expansion, or path ends in slash-dot shash-dot-dot,
1.20 christos 642: * do next segment.
643: */
1.21 christos 644: if (pglob->gl_flags & GLOB_PERIOD) {
645: for (pend = pathend; pend > pathbuf && pend[-1] == '/';
646: pend--)
647: continue;
648: diff = pend - pathbuf;
649: } else {
650: /* XXX: GCC */
651: diff = 0;
652: pend = pathend;
653: }
654:
655: if ((!anymeta) ||
656: ((pglob->gl_flags & GLOB_PERIOD) &&
657: (diff >= 1 && pend[-1] == DOT) &&
658: (diff >= 2 && (pend[-2] == SLASH || pend[-2] == DOT)) &&
659: (diff < 3 || pend[-3] == SLASH))) {
1.12 christos 660: pathend = q;
661: pattern = p;
662: while (*pattern == SEP) {
663: if (pathend >= pathlim)
664: return GLOB_ABORTED;
665: *pathend++ = *pattern++;
666: }
667: } else /* Need expansion, recurse. */
1.18 christos 668: return glob3(pathbuf, pathend, pathlim, pattern, p,
669: pglob, limit);
1.12 christos 670: }
671: /* NOTREACHED */
672: }
673:
674: static int
1.18 christos 675: glob3(Char *pathbuf, Char *pathend, Char *pathlim, Char *pattern,
676: Char *restpattern, glob_t *pglob, size_t *limit)
1.12 christos 677: {
678: struct dirent *dp;
679: DIR *dirp;
680: int error;
681: char buf[MAXPATHLEN];
682:
683: /*
684: * The readdirfunc declaration can't be prototyped, because it is
685: * assigned, below, to two functions which are prototyped in glob.h
686: * and dirent.h as taking pointers to differently typed opaque
687: * structures.
688: */
1.18 christos 689: struct dirent *(*readdirfunc)(void *);
1.12 christos 690:
691: _DIAGASSERT(pathbuf != NULL);
692: _DIAGASSERT(pathend != NULL);
693: _DIAGASSERT(pattern != NULL);
694: _DIAGASSERT(restpattern != NULL);
695: _DIAGASSERT(pglob != NULL);
696:
697: *pathend = EOS;
698: errno = 0;
699:
700: if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
701: if (pglob->gl_errfunc) {
702: if (g_Ctoc(pathbuf, buf, sizeof(buf)))
1.18 christos 703: return GLOB_ABORTED;
1.12 christos 704: if (pglob->gl_errfunc(buf, errno) ||
705: pglob->gl_flags & GLOB_ERR)
1.18 christos 706: return GLOB_ABORTED;
1.12 christos 707: }
708: /*
709: * Posix/XOpen: glob should return when it encounters a
710: * directory that it cannot open or read
711: * XXX: Should we ignore ENOTDIR and ENOENT though?
712: * I think that Posix had in mind EPERM...
713: */
714: if (pglob->gl_flags & GLOB_ERR)
1.18 christos 715: return GLOB_ABORTED;
1.12 christos 716:
1.18 christos 717: return 0;
1.12 christos 718: }
719:
720: error = 0;
721:
722: /* Search directory for matching names. */
723: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
724: readdirfunc = pglob->gl_readdir;
725: else
726: readdirfunc = (struct dirent *(*)__P((void *))) readdir;
727: while ((dp = (*readdirfunc)(dirp)) != NULL) {
728: u_char *sc;
729: Char *dc;
730:
1.19 christos 731: /*
732: * Initial DOT must be matched literally, unless we have
733: * GLOB_PERIOD set.
734: */
735: if ((pglob->gl_flags & GLOB_PERIOD) == 0)
736: if (dp->d_name[0] == DOT && *pattern != DOT)
737: continue;
1.12 christos 738: /*
1.22 christos 739: * If GLOB_NO_DOTDIRS is set, . and .. vanish.
740: */
741: if ((pglob->gl_flags & GLOB_NO_DOTDIRS) &&
742: (dp->d_name[0] == DOT) &&
743: ((dp->d_name[1] == EOS) ||
744: ((dp->d_name[1] == DOT) && (dp->d_name[2] == EOS))))
745: continue;
746: /*
1.12 christos 747: * The resulting string contains EOS, so we can
748: * use the pathlim character, if it is the nul
749: */
750: for (sc = (u_char *) dp->d_name, dc = pathend;
751: dc <= pathlim && (*dc++ = *sc++) != EOS;)
752: continue;
753:
754: /*
755: * Have we filled the buffer without seeing EOS?
756: */
757: if (dc > pathlim && *pathlim != EOS) {
758: /*
759: * Abort when requested by caller, otherwise
760: * reset pathend back to last SEP and continue
761: * with next dir entry.
762: */
763: if (pglob->gl_flags & GLOB_ERR) {
764: error = GLOB_ABORTED;
765: break;
766: }
767: else {
768: *pathend = EOS;
769: continue;
770: }
771: }
772:
773: if (!match(pathend, pattern, restpattern)) {
774: *pathend = EOS;
775: continue;
776: }
777: error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit);
778: if (error)
779: break;
780: }
781:
782: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
783: (*pglob->gl_closedir)(dirp);
784: else
785: closedir(dirp);
786:
787: /*
788: * Again Posix X/Open issue with regards to error handling.
789: */
790: if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
1.18 christos 791: return GLOB_ABORTED;
1.12 christos 792:
1.18 christos 793: return error;
1.12 christos 794: }
795:
796:
797: /*
1.17 christos 798: * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
1.12 christos 799: * add the new item, and update gl_pathc.
800: *
801: * This assumes the BSD realloc, which only copies the block when its size
802: * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
803: * behavior.
804: *
805: * Return 0 if new item added, error code if memory couldn't be allocated.
806: *
807: * Invariant of the glob_t structure:
808: * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
809: * gl_pathv points to (gl_offs + gl_pathc + 1) items.
810: */
811: static int
1.18 christos 812: globextend(const Char *path, glob_t *pglob, size_t *limit)
1.12 christos 813: {
814: char **pathv;
1.16 christos 815: size_t i, newsize, len;
1.12 christos 816: char *copy;
817: const Char *p;
818:
819: _DIAGASSERT(path != NULL);
820: _DIAGASSERT(pglob != NULL);
821:
822: newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
823: pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
824: malloc(newsize);
825: if (pathv == NULL)
1.18 christos 826: return GLOB_NOSPACE;
1.12 christos 827:
828: if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
829: /* first time around -- clear initial gl_offs items */
830: pathv += pglob->gl_offs;
1.16 christos 831: for (i = pglob->gl_offs + 1; --i > 0; )
1.12 christos 832: *--pathv = NULL;
833: }
834: pglob->gl_pathv = pathv;
835:
836: for (p = path; *p++;)
837: continue;
838: len = (size_t)(p - path);
839: *limit += len;
840: if ((copy = malloc(len)) != NULL) {
841: if (g_Ctoc(path, copy, len)) {
842: free(copy);
1.18 christos 843: return GLOB_ABORTED;
1.12 christos 844: }
845: pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
846: }
847: pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
848:
849: if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
850: errno = 0;
1.18 christos 851: return GLOB_NOSPACE;
1.12 christos 852: }
853:
1.18 christos 854: return copy == NULL ? GLOB_NOSPACE : 0;
1.12 christos 855: }
856:
857:
858: /*
859: * pattern matching function for filenames. Each occurrence of the *
860: * pattern causes a recursion level.
861: */
862: static int
1.18 christos 863: match(Char *name, Char *pat, Char *patend)
1.12 christos 864: {
865: int ok, negate_range;
866: Char c, k;
867:
868: _DIAGASSERT(name != NULL);
869: _DIAGASSERT(pat != NULL);
870: _DIAGASSERT(patend != NULL);
871:
872: while (pat < patend) {
873: c = *pat++;
874: switch (c & M_MASK) {
875: case M_ALL:
876: if (pat == patend)
1.18 christos 877: return 1;
1.12 christos 878: do
879: if (match(name, pat, patend))
1.18 christos 880: return 1;
1.12 christos 881: while (*name++ != EOS);
1.18 christos 882: return 0;
1.12 christos 883: case M_ONE:
884: if (*name++ == EOS)
1.18 christos 885: return 0;
1.12 christos 886: break;
887: case M_SET:
888: ok = 0;
889: if ((k = *name++) == EOS)
1.18 christos 890: return 0;
1.12 christos 891: if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
892: ++pat;
893: while (((c = *pat++) & M_MASK) != M_END)
894: if ((*pat & M_MASK) == M_RNG) {
895: if (c <= k && k <= pat[1])
896: ok = 1;
897: pat += 2;
898: } else if (c == k)
899: ok = 1;
900: if (ok == negate_range)
1.18 christos 901: return 0;
1.12 christos 902: break;
903: default:
904: if (*name++ != c)
1.18 christos 905: return 0;
1.12 christos 906: break;
907: }
908: }
1.18 christos 909: return *name == EOS;
1.12 christos 910: }
911:
912: /* Free allocated data belonging to a glob_t structure. */
913: void
1.18 christos 914: globfree(glob_t *pglob)
1.12 christos 915: {
1.16 christos 916: size_t i;
1.12 christos 917: char **pp;
918:
919: _DIAGASSERT(pglob != NULL);
920:
921: if (pglob->gl_pathv != NULL) {
922: pp = pglob->gl_pathv + pglob->gl_offs;
923: for (i = pglob->gl_pathc; i--; ++pp)
924: if (*pp)
925: free(*pp);
926: free(pglob->gl_pathv);
927: pglob->gl_pathv = NULL;
928: pglob->gl_pathc = 0;
929: }
930: }
931:
1.24 christos 932: #ifndef __LIBC12_SOURCE__
933: int
934: glob_pattern_p(const char *pattern, int quote)
935: {
936: int range = 0;
937:
938: for (; *pattern; pattern++)
939: switch (*pattern) {
940: case QUESTION:
941: case STAR:
942: return 1;
943:
944: case QUOTE:
945: if (quote && pattern[1] != '\0')
946: ++pattern;
947: break;
948:
949: case LBRACKET:
950: range = 1;
951: break;
952:
953: case RBRACKET:
954: if (range)
955: return 1;
956: break;
957: default:
958: break;
959: }
960:
961: return 0;
962: }
963: #endif
964:
1.12 christos 965: static DIR *
1.18 christos 966: g_opendir(Char *str, glob_t *pglob)
1.12 christos 967: {
968: char buf[MAXPATHLEN];
969:
970: _DIAGASSERT(str != NULL);
971: _DIAGASSERT(pglob != NULL);
972:
973: if (!*str)
974: (void)strlcpy(buf, ".", sizeof(buf));
975: else {
976: if (g_Ctoc(str, buf, sizeof(buf)))
977: return NULL;
978: }
979:
980: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 981: return (*pglob->gl_opendir)(buf);
1.12 christos 982:
1.18 christos 983: return opendir(buf);
1.12 christos 984: }
985:
986: static int
1.18 christos 987: g_lstat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 988: {
989: char buf[MAXPATHLEN];
990:
991: _DIAGASSERT(fn != NULL);
992: _DIAGASSERT(sb != NULL);
993: _DIAGASSERT(pglob != NULL);
994:
995: if (g_Ctoc(fn, buf, sizeof(buf)))
996: return -1;
997: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 998: return (*pglob->gl_lstat)(buf, sb);
999: return lstat(buf, sb);
1.12 christos 1000: }
1001:
1002: static int
1.18 christos 1003: g_stat(Char *fn, __gl_stat_t *sb, glob_t *pglob)
1.12 christos 1004: {
1005: char buf[MAXPATHLEN];
1006:
1007: _DIAGASSERT(fn != NULL);
1008: _DIAGASSERT(sb != NULL);
1009: _DIAGASSERT(pglob != NULL);
1010:
1011: if (g_Ctoc(fn, buf, sizeof(buf)))
1012: return -1;
1013: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
1.18 christos 1014: return (*pglob->gl_stat)(buf, sb);
1015: return stat(buf, sb);
1.12 christos 1016: }
1017:
1018: static Char *
1.18 christos 1019: g_strchr(const Char *str, int ch)
1.12 christos 1020: {
1021:
1022: _DIAGASSERT(str != NULL);
1023:
1024: do {
1025: if (*str == ch)
1.14 christos 1026: return __UNCONST(str);
1.12 christos 1027: } while (*str++);
1028: return NULL;
1029: }
1030:
1031: static int
1.18 christos 1032: g_Ctoc(const Char *str, char *buf, size_t len)
1.12 christos 1033: {
1034: char *dc;
1035:
1036: _DIAGASSERT(str != NULL);
1037: _DIAGASSERT(buf != NULL);
1038:
1039: if (len == 0)
1040: return 1;
1041:
1042: for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1043: continue;
1044:
1045: return len == 0;
1046: }
1047:
1048: #ifdef DEBUG
1049: static void
1.18 christos 1050: qprintf(const char *str, Char *s)
1.12 christos 1051: {
1052: Char *p;
1053:
1054: _DIAGASSERT(str != NULL);
1055: _DIAGASSERT(s != NULL);
1056:
1057: (void)printf("%s:\n", str);
1058: for (p = s; *p; p++)
1059: (void)printf("%c", CHAR(*p));
1060: (void)printf("\n");
1061: for (p = s; *p; p++)
1062: (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1063: (void)printf("\n");
1064: for (p = s; *p; p++)
1065: (void)printf("%c", ismeta(*p) ? '_' : ' ');
1066: (void)printf("\n");
1067: }
1068: #endif
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