Annotation of src/lib/libc/gen/glob.c, Revision 1.13
1.13 ! elad 1: /* $NetBSD: glob.c,v 1.12 2005/09/13 01:44:09 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
1.13 ! elad 40: __RCSID("$NetBSD: glob.c,v 1.12 2005/09/13 01:44:09 christos Exp $");
1.12 christos 41: #endif
42: #endif /* LIBC_SCCS and not lint */
1.1 cgd 43:
1.12 christos 44: /*
45: * glob(3) -- a superset of the one defined in POSIX 1003.2.
46: *
47: * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
48: *
49: * Optional extra services, controlled by flags not defined by POSIX:
50: *
51: * GLOB_MAGCHAR:
52: * Set in gl_flags if pattern contained a globbing character.
53: * GLOB_NOMAGIC:
54: * Same as GLOB_NOCHECK, but it will only append pattern if it did
55: * not contain any magic characters. [Used in csh style globbing]
56: * GLOB_ALTDIRFUNC:
57: * Use alternately specified directory access functions.
58: * GLOB_TILDE:
59: * expand ~user/foo to the /home/dir/of/user/foo
60: * GLOB_BRACE:
61: * expand {1,2}{a,b} to 1a 1b 2a 2b
62: * gl_matchc:
63: * Number of matches in the current invocation of glob.
64: */
65:
66: #include "namespace.h"
67: #include <sys/param.h>
68: #include <sys/stat.h>
69:
70: #include <assert.h>
71: #include <ctype.h>
72: #include <dirent.h>
73: #include <errno.h>
74: #include <glob.h>
75: #include <pwd.h>
76: #include <stdio.h>
77: #include <stdlib.h>
78: #include <string.h>
79: #include <unistd.h>
80:
81: #ifdef HAVE_NBTOOL_CONFIG_H
82: #define NO_GETPW_R
83: #endif
84:
85: /*
86: * XXX: For NetBSD 1.4.x compatibility. (kill me l8r)
87: */
88: #ifndef _DIAGASSERT
89: #define _DIAGASSERT(a)
90: #endif
91:
92: #define DOLLAR '$'
93: #define DOT '.'
94: #define EOS '\0'
95: #define LBRACKET '['
96: #define NOT '!'
97: #define QUESTION '?'
98: #define QUOTE '\\'
99: #define RANGE '-'
100: #define RBRACKET ']'
101: #define SEP '/'
102: #define STAR '*'
103: #define TILDE '~'
104: #define UNDERSCORE '_'
105: #define LBRACE '{'
106: #define RBRACE '}'
107: #define SLASH '/'
108: #define COMMA ','
109:
110: #ifndef DEBUG
111:
112: #define M_QUOTE 0x8000
113: #define M_PROTECT 0x4000
114: #define M_MASK 0xffff
115: #define M_ASCII 0x00ff
116:
117: typedef u_short Char;
118:
119: #else
120:
121: #define M_QUOTE 0x80
122: #define M_PROTECT 0x40
123: #define M_MASK 0xff
124: #define M_ASCII 0x7f
125:
126: typedef char Char;
127:
128: #endif
129:
130:
131: #define CHAR(c) ((Char)((c)&M_ASCII))
132: #define META(c) ((Char)((c)|M_QUOTE))
133: #define M_ALL META('*')
134: #define M_END META(']')
135: #define M_NOT META('!')
136: #define M_ONE META('?')
137: #define M_RNG META('-')
138: #define M_SET META('[')
139: #define ismeta(c) (((c)&M_QUOTE) != 0)
140:
141:
142: static int compare __P((const void *, const void *));
143: static int g_Ctoc __P((const Char *, char *, size_t));
144: static int g_lstat __P((Char *, __gl_stat_t *, glob_t *));
145: static DIR *g_opendir __P((Char *, glob_t *));
146: static Char *g_strchr __P((const Char *, int));
147: static int g_stat __P((Char *, __gl_stat_t *, glob_t *));
148: static int glob0 __P((const Char *, glob_t *));
149: static int glob1 __P((Char *, glob_t *, size_t *));
150: static int glob2 __P((Char *, Char *, Char *, Char *, glob_t *,
151: size_t *));
152: static int glob3 __P((Char *, Char *, Char *, Char *, Char *, glob_t *,
153: size_t *));
154: static int globextend __P((const Char *, glob_t *, size_t *));
155: static const Char *globtilde __P((const Char *, Char *, size_t, glob_t *));
156: static int globexp1 __P((const Char *, glob_t *));
157: static int globexp2 __P((const Char *, const Char *, glob_t *, int *));
158: static int match __P((Char *, Char *, Char *));
159: #ifdef DEBUG
160: static void qprintf __P((const char *, Char *));
161: #endif
162:
163: int
164: glob(pattern, flags, errfunc, pglob)
165: const char *pattern;
166: int flags, (*errfunc) __P((const char *, int));
167: glob_t *pglob;
168: {
169: const u_char *patnext;
170: int c;
171: Char *bufnext, *bufend, patbuf[MAXPATHLEN+1];
172:
173: _DIAGASSERT(pattern != NULL);
174:
175: patnext = (const u_char *) pattern;
176: if (!(flags & GLOB_APPEND)) {
177: pglob->gl_pathc = 0;
178: pglob->gl_pathv = NULL;
179: if (!(flags & GLOB_DOOFFS))
180: pglob->gl_offs = 0;
181: }
182: pglob->gl_flags = flags & ~GLOB_MAGCHAR;
183: pglob->gl_errfunc = errfunc;
184: pglob->gl_matchc = 0;
185:
186: bufnext = patbuf;
187: bufend = bufnext + MAXPATHLEN;
188: if (flags & GLOB_NOESCAPE) {
189: while (bufnext < bufend && (c = *patnext++) != EOS)
190: *bufnext++ = c;
191: } else {
192: /* Protect the quoted characters. */
193: while (bufnext < bufend && (c = *patnext++) != EOS)
194: if (c == QUOTE) {
195: if ((c = *patnext++) == EOS) {
196: c = QUOTE;
197: --patnext;
198: }
199: *bufnext++ = c | M_PROTECT;
200: }
201: else
202: *bufnext++ = c;
203: }
204: *bufnext = EOS;
205:
206: if (flags & GLOB_BRACE)
207: return globexp1(patbuf, pglob);
208: else
209: return glob0(patbuf, pglob);
210: }
211:
212: /*
213: * Expand recursively a glob {} pattern. When there is no more expansion
214: * invoke the standard globbing routine to glob the rest of the magic
215: * characters
216: */
217: static int
218: globexp1(pattern, pglob)
219: const Char *pattern;
220: glob_t *pglob;
221: {
222: const Char* ptr = pattern;
223: int rv;
224:
225: _DIAGASSERT(pattern != NULL);
226: _DIAGASSERT(pglob != NULL);
227:
228: /* Protect a single {}, for find(1), like csh */
229: if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
230: return glob0(pattern, pglob);
231:
232: while ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
233: if (!globexp2(ptr, pattern, pglob, &rv))
234: return rv;
235:
236: return glob0(pattern, pglob);
237: }
238:
239:
240: /*
241: * Recursive brace globbing helper. Tries to expand a single brace.
242: * If it succeeds then it invokes globexp1 with the new pattern.
243: * If it fails then it tries to glob the rest of the pattern and returns.
244: */
245: static int
246: globexp2(ptr, pattern, pglob, rv)
247: const Char *ptr, *pattern;
248: glob_t *pglob;
249: int *rv;
250: {
251: int i;
252: Char *lm, *ls;
253: const Char *pe, *pm, *pl;
254: Char patbuf[MAXPATHLEN + 1];
255:
256: _DIAGASSERT(ptr != NULL);
257: _DIAGASSERT(pattern != NULL);
258: _DIAGASSERT(pglob != NULL);
259: _DIAGASSERT(rv != NULL);
260:
261: /* copy part up to the brace */
262: for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
263: continue;
264: ls = lm;
265:
266: /* Find the balanced brace */
267: for (i = 0, pe = ++ptr; *pe; pe++)
268: if (*pe == LBRACKET) {
269: /* Ignore everything between [] */
270: for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
271: continue;
272: if (*pe == EOS) {
273: /*
274: * We could not find a matching RBRACKET.
275: * Ignore and just look for RBRACE
276: */
277: pe = pm;
278: }
279: }
280: else if (*pe == LBRACE)
281: i++;
282: else if (*pe == RBRACE) {
283: if (i == 0)
284: break;
285: i--;
286: }
287:
288: /* Non matching braces; just glob the pattern */
289: if (i != 0 || *pe == EOS) {
290: /*
291: * we use `pattern', not `patbuf' here so that that
292: * unbalanced braces are passed to the match
293: */
294: *rv = glob0(pattern, pglob);
295: return 0;
296: }
297:
298: for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
299: switch (*pm) {
300: case LBRACKET:
301: /* Ignore everything between [] */
302: for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
303: continue;
304: if (*pm == EOS) {
305: /*
306: * We could not find a matching RBRACKET.
307: * Ignore and just look for RBRACE
308: */
309: pm = pl;
310: }
311: break;
312:
313: case LBRACE:
314: i++;
315: break;
316:
317: case RBRACE:
318: if (i) {
319: i--;
320: break;
321: }
322: /* FALLTHROUGH */
323: case COMMA:
324: if (i && *pm == COMMA)
325: break;
326: else {
327: /* Append the current string */
328: for (lm = ls; (pl < pm); *lm++ = *pl++)
329: continue;
330: /*
331: * Append the rest of the pattern after the
332: * closing brace
333: */
334: for (pl = pe + 1; (*lm++ = *pl++) != EOS;)
335: continue;
336:
337: /* Expand the current pattern */
338: #ifdef DEBUG
339: qprintf("globexp2:", patbuf);
340: #endif
341: *rv = globexp1(patbuf, pglob);
342:
343: /* move after the comma, to the next string */
344: pl = pm + 1;
345: }
346: break;
347:
348: default:
349: break;
350: }
351: }
352: *rv = 0;
353: return 0;
354: }
355:
356:
357:
358: /*
359: * expand tilde from the passwd file.
360: */
361: static const Char *
362: globtilde(pattern, patbuf, patsize, pglob)
363: const Char *pattern;
364: Char *patbuf;
365: size_t patsize;
366: glob_t *pglob;
367: {
368: struct passwd *pwd;
369: const char *h;
370: const Char *p;
371: Char *b;
372: char *d;
373: Char *pend = &patbuf[patsize / sizeof(Char)];
374: #ifndef NO_GETPW_R
375: struct passwd pwres;
376: char pwbuf[1024];
377: #endif
378:
379: pend--;
380:
381: _DIAGASSERT(pattern != NULL);
382: _DIAGASSERT(patbuf != NULL);
383: _DIAGASSERT(pglob != NULL);
384:
385: if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
386: return pattern;
387:
388: /* Copy up to the end of the string or / */
389: for (p = pattern + 1, d = (char *)(void *)patbuf;
390: d < (char *)(void *)pend && *p && *p != SLASH;
391: *d++ = *p++)
392: continue;
393:
394: if (d == (char *)(void *)pend)
395: return NULL;
396:
397: *d = EOS;
398: d = (char *)(void *)patbuf;
399:
400: if (*d == EOS) {
401: /*
402: * handle a plain ~ or ~/ by expanding $HOME
403: * first and then trying the password file
404: */
405: if ((h = getenv("HOME")) == NULL) {
406: #ifdef NO_GETPW_R
407: if ((pwd = getpwuid(getuid())) == NULL)
408: #else
409: if (getpwuid_r(getuid(), &pwres, pwbuf, sizeof(pwbuf),
410: &pwd) != 0 || pwd == NULL)
411: #endif
412: return pattern;
413: else
414: h = pwd->pw_dir;
415: }
416: }
417: else {
418: /*
419: * Expand a ~user
420: */
421: #ifdef NO_GETPW_R
422: if ((pwd = getpwnam(d)) == NULL)
423: #else
424: if (getpwnam_r(d, &pwres, pwbuf, sizeof(pwbuf), &pwd) != 0 ||
425: pwd == NULL)
426: #endif
427: return pattern;
428: else
429: h = pwd->pw_dir;
430: }
431:
432: /* Copy the home directory */
433: for (b = patbuf; b < pend && *h; *b++ = *h++)
434: continue;
435:
436: if (b == pend)
437: return NULL;
438:
439: /* Append the rest of the pattern */
440: while (b < pend && (*b++ = *p++) != EOS)
441: continue;
442:
443: if (b == pend)
444: return NULL;
445:
446: return patbuf;
447: }
448:
449:
450: /*
451: * The main glob() routine: compiles the pattern (optionally processing
452: * quotes), calls glob1() to do the real pattern matching, and finally
453: * sorts the list (unless unsorted operation is requested). Returns 0
454: * if things went well, nonzero if errors occurred. It is not an error
455: * to find no matches.
456: */
457: static int
458: glob0(pattern, pglob)
459: const Char *pattern;
460: glob_t *pglob;
461: {
462: const Char *qpatnext;
463: int c, error, oldpathc;
464: Char *bufnext, patbuf[MAXPATHLEN+1];
465: size_t limit = 0;
466:
467: _DIAGASSERT(pattern != NULL);
468: _DIAGASSERT(pglob != NULL);
469:
470: if ((qpatnext = globtilde(pattern, patbuf, sizeof(patbuf),
471: pglob)) == NULL)
472: return GLOB_ABEND;
473: oldpathc = pglob->gl_pathc;
474: bufnext = patbuf;
475:
476: /* We don't need to check for buffer overflow any more. */
477: while ((c = *qpatnext++) != EOS) {
478: switch (c) {
479: case LBRACKET:
480: c = *qpatnext;
481: if (c == NOT)
482: ++qpatnext;
483: if (*qpatnext == EOS ||
484: g_strchr(qpatnext+1, RBRACKET) == NULL) {
485: *bufnext++ = LBRACKET;
486: if (c == NOT)
487: --qpatnext;
488: break;
489: }
490: *bufnext++ = M_SET;
491: if (c == NOT)
492: *bufnext++ = M_NOT;
493: c = *qpatnext++;
494: do {
495: *bufnext++ = CHAR(c);
496: if (*qpatnext == RANGE &&
497: (c = qpatnext[1]) != RBRACKET) {
498: *bufnext++ = M_RNG;
499: *bufnext++ = CHAR(c);
500: qpatnext += 2;
501: }
502: } while ((c = *qpatnext++) != RBRACKET);
503: pglob->gl_flags |= GLOB_MAGCHAR;
504: *bufnext++ = M_END;
505: break;
506: case QUESTION:
507: pglob->gl_flags |= GLOB_MAGCHAR;
508: *bufnext++ = M_ONE;
509: break;
510: case STAR:
511: pglob->gl_flags |= GLOB_MAGCHAR;
512: /* collapse adjacent stars to one,
513: * to avoid exponential behavior
514: */
515: if (bufnext == patbuf || bufnext[-1] != M_ALL)
516: *bufnext++ = M_ALL;
517: break;
518: default:
519: *bufnext++ = CHAR(c);
520: break;
521: }
522: }
523: *bufnext = EOS;
524: #ifdef DEBUG
525: qprintf("glob0:", patbuf);
526: #endif
527:
528: if ((error = glob1(patbuf, pglob, &limit)) != 0)
529: return(error);
530:
531: if (pglob->gl_pathc == oldpathc) {
532: /*
533: * If there was no match we are going to append the pattern
534: * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was
535: * specified and the pattern did not contain any magic
536: * characters GLOB_NOMAGIC is there just for compatibility
537: * with csh.
538: */
539: if ((pglob->gl_flags & GLOB_NOCHECK) ||
540: ((pglob->gl_flags & (GLOB_NOMAGIC|GLOB_MAGCHAR))
541: == GLOB_NOMAGIC)) {
542: return globextend(pattern, pglob, &limit);
543: } else {
544: return (GLOB_NOMATCH);
545: }
546: } else if (!(pglob->gl_flags & GLOB_NOSORT)) {
547: qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
548: (size_t)pglob->gl_pathc - oldpathc, sizeof(char *),
549: compare);
550: }
551:
552: return(0);
553: }
554:
555: static int
556: compare(p, q)
557: const void *p, *q;
558: {
559:
560: _DIAGASSERT(p != NULL);
561: _DIAGASSERT(q != NULL);
562:
563: return(strcoll(*(const char * const *)p, *(const char * const *)q));
564: }
565:
566: static int
567: glob1(pattern, pglob, limit)
568: Char *pattern;
569: glob_t *pglob;
570: size_t *limit;
571: {
572: Char pathbuf[MAXPATHLEN+1];
573:
574: _DIAGASSERT(pattern != NULL);
575: _DIAGASSERT(pglob != NULL);
576:
577: /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
578: if (*pattern == EOS)
579: return(0);
580: /*
581: * we save one character so that we can use ptr >= limit,
582: * in the general case when we are appending non nul chars only.
583: */
1.13 ! elad 584: return(glob2(pathbuf, pathbuf,
! 585: pathbuf + (sizeof(pathbuf) / sizeof(*pathbuf)) - 1,
! 586: pattern,
1.12 christos 587: pglob, limit));
588: }
589:
590: /*
591: * The functions glob2 and glob3 are mutually recursive; there is one level
592: * of recursion for each segment in the pattern that contains one or more
593: * meta characters.
594: */
595: static int
596: glob2(pathbuf, pathend, pathlim, pattern, pglob, limit)
597: Char *pathbuf, *pathend, *pathlim, *pattern;
598: glob_t *pglob;
599: size_t *limit;
600: {
601: __gl_stat_t sb;
602: Char *p, *q;
603: int anymeta;
604:
605: _DIAGASSERT(pathbuf != NULL);
606: _DIAGASSERT(pathend != NULL);
607: _DIAGASSERT(pattern != NULL);
608: _DIAGASSERT(pglob != NULL);
609:
610: /*
611: * Loop over pattern segments until end of pattern or until
612: * segment with meta character found.
613: */
614: for (anymeta = 0;;) {
615: if (*pattern == EOS) { /* End of pattern? */
616: *pathend = EOS;
617: if (g_lstat(pathbuf, &sb, pglob))
618: return(0);
619:
620: if (((pglob->gl_flags & GLOB_MARK) &&
621: pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
622: (S_ISLNK(sb.st_mode) &&
623: (g_stat(pathbuf, &sb, pglob) == 0) &&
624: S_ISDIR(sb.st_mode)))) {
625: if (pathend >= pathlim)
626: return (GLOB_ABORTED);
627: *pathend++ = SEP;
628: *pathend = EOS;
629: }
630: ++pglob->gl_matchc;
631: return(globextend(pathbuf, pglob, limit));
632: }
633:
634: /* Find end of next segment, copy tentatively to pathend. */
635: q = pathend;
636: p = pattern;
637: while (*p != EOS && *p != SEP) {
638: if (ismeta(*p))
639: anymeta = 1;
640: if (q >= pathlim)
641: return GLOB_ABORTED;
642: *q++ = *p++;
643: }
644:
645: if (!anymeta) { /* No expansion, do next segment. */
646: pathend = q;
647: pattern = p;
648: while (*pattern == SEP) {
649: if (pathend >= pathlim)
650: return GLOB_ABORTED;
651: *pathend++ = *pattern++;
652: }
653: } else /* Need expansion, recurse. */
654: return(glob3(pathbuf, pathend, pathlim, pattern, p,
655: pglob, limit));
656: }
657: /* NOTREACHED */
658: }
659:
660: static int
661: glob3(pathbuf, pathend, pathlim, pattern, restpattern, pglob, limit)
662: Char *pathbuf, *pathend, *pathlim, *pattern, *restpattern;
663: glob_t *pglob;
664: size_t *limit;
665: {
666: struct dirent *dp;
667: DIR *dirp;
668: int error;
669: char buf[MAXPATHLEN];
670:
671: /*
672: * The readdirfunc declaration can't be prototyped, because it is
673: * assigned, below, to two functions which are prototyped in glob.h
674: * and dirent.h as taking pointers to differently typed opaque
675: * structures.
676: */
677: struct dirent *(*readdirfunc) __P((void *));
678:
679: _DIAGASSERT(pathbuf != NULL);
680: _DIAGASSERT(pathend != NULL);
681: _DIAGASSERT(pattern != NULL);
682: _DIAGASSERT(restpattern != NULL);
683: _DIAGASSERT(pglob != NULL);
684:
685: *pathend = EOS;
686: errno = 0;
687:
688: if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
689: if (pglob->gl_errfunc) {
690: if (g_Ctoc(pathbuf, buf, sizeof(buf)))
691: return (GLOB_ABORTED);
692: if (pglob->gl_errfunc(buf, errno) ||
693: pglob->gl_flags & GLOB_ERR)
694: return (GLOB_ABORTED);
695: }
696: /*
697: * Posix/XOpen: glob should return when it encounters a
698: * directory that it cannot open or read
699: * XXX: Should we ignore ENOTDIR and ENOENT though?
700: * I think that Posix had in mind EPERM...
701: */
702: if (pglob->gl_flags & GLOB_ERR)
703: return (GLOB_ABORTED);
704:
705: return(0);
706: }
707:
708: error = 0;
709:
710: /* Search directory for matching names. */
711: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
712: readdirfunc = pglob->gl_readdir;
713: else
714: readdirfunc = (struct dirent *(*)__P((void *))) readdir;
715: while ((dp = (*readdirfunc)(dirp)) != NULL) {
716: u_char *sc;
717: Char *dc;
718:
719: /* Initial DOT must be matched literally. */
720: if (dp->d_name[0] == DOT && *pattern != DOT)
721: continue;
722: /*
723: * The resulting string contains EOS, so we can
724: * use the pathlim character, if it is the nul
725: */
726: for (sc = (u_char *) dp->d_name, dc = pathend;
727: dc <= pathlim && (*dc++ = *sc++) != EOS;)
728: continue;
729:
730: /*
731: * Have we filled the buffer without seeing EOS?
732: */
733: if (dc > pathlim && *pathlim != EOS) {
734: /*
735: * Abort when requested by caller, otherwise
736: * reset pathend back to last SEP and continue
737: * with next dir entry.
738: */
739: if (pglob->gl_flags & GLOB_ERR) {
740: error = GLOB_ABORTED;
741: break;
742: }
743: else {
744: *pathend = EOS;
745: continue;
746: }
747: }
748:
749: if (!match(pathend, pattern, restpattern)) {
750: *pathend = EOS;
751: continue;
752: }
753: error = glob2(pathbuf, --dc, pathlim, restpattern, pglob, limit);
754: if (error)
755: break;
756: }
757:
758: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
759: (*pglob->gl_closedir)(dirp);
760: else
761: closedir(dirp);
762:
763: /*
764: * Again Posix X/Open issue with regards to error handling.
765: */
766: if ((error || errno) && (pglob->gl_flags & GLOB_ERR))
767: return (GLOB_ABORTED);
768:
769: return(error);
770: }
771:
772:
773: /*
774: * Extend the gl_pathv member of a glob_t structure to accomodate a new item,
775: * add the new item, and update gl_pathc.
776: *
777: * This assumes the BSD realloc, which only copies the block when its size
778: * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
779: * behavior.
780: *
781: * Return 0 if new item added, error code if memory couldn't be allocated.
782: *
783: * Invariant of the glob_t structure:
784: * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
785: * gl_pathv points to (gl_offs + gl_pathc + 1) items.
786: */
787: static int
788: globextend(path, pglob, limit)
789: const Char *path;
790: glob_t *pglob;
791: size_t *limit;
792: {
793: char **pathv;
794: int i;
795: size_t newsize, len;
796: char *copy;
797: const Char *p;
798:
799: _DIAGASSERT(path != NULL);
800: _DIAGASSERT(pglob != NULL);
801:
802: newsize = sizeof(*pathv) * (2 + pglob->gl_pathc + pglob->gl_offs);
803: pathv = pglob->gl_pathv ? realloc(pglob->gl_pathv, newsize) :
804: malloc(newsize);
805: if (pathv == NULL)
806: return(GLOB_NOSPACE);
807:
808: if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
809: /* first time around -- clear initial gl_offs items */
810: pathv += pglob->gl_offs;
811: for (i = pglob->gl_offs; --i >= 0; )
812: *--pathv = NULL;
813: }
814: pglob->gl_pathv = pathv;
815:
816: for (p = path; *p++;)
817: continue;
818: len = (size_t)(p - path);
819: *limit += len;
820: if ((copy = malloc(len)) != NULL) {
821: if (g_Ctoc(path, copy, len)) {
822: free(copy);
823: return(GLOB_ABORTED);
824: }
825: pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
826: }
827: pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
828:
829: if ((pglob->gl_flags & GLOB_LIMIT) && (newsize + *limit) >= ARG_MAX) {
830: errno = 0;
831: return(GLOB_NOSPACE);
832: }
833:
834: return(copy == NULL ? GLOB_NOSPACE : 0);
835: }
836:
837:
838: /*
839: * pattern matching function for filenames. Each occurrence of the *
840: * pattern causes a recursion level.
841: */
842: static int
843: match(name, pat, patend)
844: Char *name, *pat, *patend;
845: {
846: int ok, negate_range;
847: Char c, k;
848:
849: _DIAGASSERT(name != NULL);
850: _DIAGASSERT(pat != NULL);
851: _DIAGASSERT(patend != NULL);
852:
853: while (pat < patend) {
854: c = *pat++;
855: switch (c & M_MASK) {
856: case M_ALL:
857: if (pat == patend)
858: return(1);
859: do
860: if (match(name, pat, patend))
861: return(1);
862: while (*name++ != EOS);
863: return(0);
864: case M_ONE:
865: if (*name++ == EOS)
866: return(0);
867: break;
868: case M_SET:
869: ok = 0;
870: if ((k = *name++) == EOS)
871: return(0);
872: if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
873: ++pat;
874: while (((c = *pat++) & M_MASK) != M_END)
875: if ((*pat & M_MASK) == M_RNG) {
876: if (c <= k && k <= pat[1])
877: ok = 1;
878: pat += 2;
879: } else if (c == k)
880: ok = 1;
881: if (ok == negate_range)
882: return(0);
883: break;
884: default:
885: if (*name++ != c)
886: return(0);
887: break;
888: }
889: }
890: return(*name == EOS);
891: }
892:
893: /* Free allocated data belonging to a glob_t structure. */
894: void
895: globfree(pglob)
896: glob_t *pglob;
897: {
898: int i;
899: char **pp;
900:
901: _DIAGASSERT(pglob != NULL);
902:
903: if (pglob->gl_pathv != NULL) {
904: pp = pglob->gl_pathv + pglob->gl_offs;
905: for (i = pglob->gl_pathc; i--; ++pp)
906: if (*pp)
907: free(*pp);
908: free(pglob->gl_pathv);
909: pglob->gl_pathv = NULL;
910: pglob->gl_pathc = 0;
911: }
912: }
913:
914: static DIR *
915: g_opendir(str, pglob)
916: Char *str;
917: glob_t *pglob;
918: {
919: char buf[MAXPATHLEN];
920:
921: _DIAGASSERT(str != NULL);
922: _DIAGASSERT(pglob != NULL);
923:
924: if (!*str)
925: (void)strlcpy(buf, ".", sizeof(buf));
926: else {
927: if (g_Ctoc(str, buf, sizeof(buf)))
928: return NULL;
929: }
930:
931: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
932: return((*pglob->gl_opendir)(buf));
933:
934: return(opendir(buf));
935: }
936:
937: static int
938: g_lstat(fn, sb, pglob)
939: Char *fn;
940: __gl_stat_t *sb;
941: glob_t *pglob;
942: {
943: char buf[MAXPATHLEN];
944:
945: _DIAGASSERT(fn != NULL);
946: _DIAGASSERT(sb != NULL);
947: _DIAGASSERT(pglob != NULL);
948:
949: if (g_Ctoc(fn, buf, sizeof(buf)))
950: return -1;
951: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
952: return((*pglob->gl_lstat)(buf, sb));
953: return(lstat(buf, sb));
954: }
955:
956: static int
957: g_stat(fn, sb, pglob)
958: Char *fn;
959: __gl_stat_t *sb;
960: glob_t *pglob;
961: {
962: char buf[MAXPATHLEN];
963:
964: _DIAGASSERT(fn != NULL);
965: _DIAGASSERT(sb != NULL);
966: _DIAGASSERT(pglob != NULL);
967:
968: if (g_Ctoc(fn, buf, sizeof(buf)))
969: return -1;
970: if (pglob->gl_flags & GLOB_ALTDIRFUNC)
971: return((*pglob->gl_stat)(buf, sb));
972: return(stat(buf, sb));
973: }
974:
975: static Char *
976: g_strchr(str, ch)
977: const Char *str;
978: int ch;
979: {
980:
981: _DIAGASSERT(str != NULL);
982:
983: do {
984: if (*str == ch)
985: /* LINTED this is libc's definition! */
986: return (Char *)str;
987: } while (*str++);
988: return NULL;
989: }
990:
991: static int
992: g_Ctoc(str, buf, len)
993: const Char *str;
994: char *buf;
995: size_t len;
996: {
997: char *dc;
998:
999: _DIAGASSERT(str != NULL);
1000: _DIAGASSERT(buf != NULL);
1001:
1002: if (len == 0)
1003: return 1;
1004:
1005: for (dc = buf; len && (*dc++ = *str++) != EOS; len--)
1006: continue;
1007:
1008: return len == 0;
1009: }
1010:
1011: #ifdef DEBUG
1012: static void
1013: qprintf(str, s)
1014: const char *str;
1015: Char *s;
1016: {
1017: Char *p;
1018:
1019: _DIAGASSERT(str != NULL);
1020: _DIAGASSERT(s != NULL);
1021:
1022: (void)printf("%s:\n", str);
1023: for (p = s; *p; p++)
1024: (void)printf("%c", CHAR(*p));
1025: (void)printf("\n");
1026: for (p = s; *p; p++)
1027: (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1028: (void)printf("\n");
1029: for (p = s; *p; p++)
1030: (void)printf("%c", ismeta(*p) ? '_' : ' ');
1031: (void)printf("\n");
1032: }
1033: #endif
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