1 /* $OpenBSD: glob.c,v 1.35 2011/01/12 01:53:14 djm Exp $ */
3 * Copyright (c) 1989, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
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34 /* OPENBSD ORIGINAL: lib/libc/gen/glob.c */
37 * glob(3) -- a superset of the one defined in POSIX 1003.2.
39 * The [!...] convention to negate a range is supported (SysV, Posix, ksh).
41 * Optional extra services, controlled by flags not defined by POSIX:
44 * Escaping convention: \ inhibits any special meaning the following
45 * character might have (except \ at end of string is retained).
47 * Set in gl_flags if pattern contained a globbing character.
49 * Same as GLOB_NOCHECK, but it will only append pattern if it did
50 * not contain any magic characters. [Used in csh style globbing]
52 * Use alternately specified directory access functions.
54 * expand ~user/foo to the /home/dir/of/user/foo
56 * expand {1,2}{a,b} to 1a 1b 2a 2b
58 * Number of matches in the current invocation of glob.
63 #include <sys/types.h>
74 #if !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) || \
75 !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) || \
76 !defined(HAVE_DECL_GLOB_NOMATCH) || HAVE_DECL_GLOB_NOMATCH == 0 || \
79 #include "charclass.h"
93 #define UNDERSCORE '_'
101 #define M_QUOTE 0x8000
102 #define M_PROTECT 0x4000
103 #define M_MASK 0xffff
104 #define M_ASCII 0x00ff
106 typedef u_short Char;
111 #define M_PROTECT 0x40
120 #define CHAR(c) ((Char)((c)&M_ASCII))
121 #define META(c) ((Char)((c)|M_QUOTE))
122 #define M_ALL META('*')
123 #define M_END META(']')
124 #define M_NOT META('!')
125 #define M_ONE META('?')
126 #define M_RNG META('-')
127 #define M_SET META('[')
128 #define M_CLASS META(':')
129 #define ismeta(c) (((c)&M_QUOTE) != 0)
131 #define GLOB_LIMIT_MALLOC 65536
132 #define GLOB_LIMIT_STAT 128
133 #define GLOB_LIMIT_READDIR 16384
141 static int compare(const void *, const void *);
142 static int g_Ctoc(const Char *, char *, u_int);
143 static int g_lstat(Char *, struct stat *, glob_t *);
144 static DIR *g_opendir(Char *, glob_t *);
145 static Char *g_strchr(const Char *, int);
146 static int g_strncmp(const Char *, const char *, size_t);
147 static int g_stat(Char *, struct stat *, glob_t *);
148 static int glob0(const Char *, glob_t *, struct glob_lim *);
149 static int glob1(Char *, Char *, glob_t *, struct glob_lim *);
150 static int glob2(Char *, Char *, Char *, Char *, Char *, Char *,
151 glob_t *, struct glob_lim *);
152 static int glob3(Char *, Char *, Char *, Char *, Char *,
153 Char *, Char *, glob_t *, struct glob_lim *);
154 static int globextend(const Char *, glob_t *, struct glob_lim *,
157 globtilde(const Char *, Char *, size_t, glob_t *);
158 static int globexp1(const Char *, glob_t *, struct glob_lim *);
159 static int globexp2(const Char *, const Char *, glob_t *,
161 static int match(Char *, Char *, Char *);
163 static void qprintf(const char *, Char *);
167 glob(const char *pattern, int flags, int (*errfunc)(const char *, int),
170 const u_char *patnext;
172 Char *bufnext, *bufend, patbuf[MAXPATHLEN];
173 struct glob_lim limit = { 0, 0, 0 };
175 patnext = (u_char *) pattern;
176 if (!(flags & GLOB_APPEND)) {
178 pglob->gl_pathv = NULL;
179 pglob->gl_statv = NULL;
180 if (!(flags & GLOB_DOOFFS))
183 pglob->gl_flags = flags & ~GLOB_MAGCHAR;
184 pglob->gl_errfunc = errfunc;
185 pglob->gl_matchc = 0;
187 if (pglob->gl_offs < 0 || pglob->gl_pathc < 0 ||
188 pglob->gl_offs >= INT_MAX || pglob->gl_pathc >= INT_MAX ||
189 pglob->gl_pathc >= INT_MAX - pglob->gl_offs - 1)
193 bufend = bufnext + MAXPATHLEN - 1;
194 if (flags & GLOB_NOESCAPE)
195 while (bufnext < bufend && (c = *patnext++) != EOS)
198 /* Protect the quoted characters. */
199 while (bufnext < bufend && (c = *patnext++) != EOS)
201 if ((c = *patnext++) == EOS) {
205 *bufnext++ = c | M_PROTECT;
211 if (flags & GLOB_BRACE)
212 return globexp1(patbuf, pglob, &limit);
214 return glob0(patbuf, pglob, &limit);
218 * Expand recursively a glob {} pattern. When there is no more expansion
219 * invoke the standard globbing routine to glob the rest of the magic
223 globexp1(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
225 const Char* ptr = pattern;
227 /* Protect a single {}, for find(1), like csh */
228 if (pattern[0] == LBRACE && pattern[1] == RBRACE && pattern[2] == EOS)
229 return glob0(pattern, pglob, limitp);
231 if ((ptr = (const Char *) g_strchr(ptr, LBRACE)) != NULL)
232 return globexp2(ptr, pattern, pglob, limitp);
234 return glob0(pattern, pglob, limitp);
239 * Recursive brace globbing helper. Tries to expand a single brace.
240 * If it succeeds then it invokes globexp1 with the new pattern.
241 * If it fails then it tries to glob the rest of the pattern and returns.
244 globexp2(const Char *ptr, const Char *pattern, glob_t *pglob,
245 struct glob_lim *limitp)
249 const Char *pe, *pm, *pl;
250 Char patbuf[MAXPATHLEN];
252 /* copy part up to the brace */
253 for (lm = patbuf, pm = pattern; pm != ptr; *lm++ = *pm++)
258 /* Find the balanced brace */
259 for (i = 0, pe = ++ptr; *pe; pe++)
260 if (*pe == LBRACKET) {
261 /* Ignore everything between [] */
262 for (pm = pe++; *pe != RBRACKET && *pe != EOS; pe++)
266 * We could not find a matching RBRACKET.
267 * Ignore and just look for RBRACE
271 } else if (*pe == LBRACE)
273 else if (*pe == RBRACE) {
279 /* Non matching braces; just glob the pattern */
280 if (i != 0 || *pe == EOS)
281 return glob0(patbuf, pglob, limitp);
283 for (i = 0, pl = pm = ptr; pm <= pe; pm++) {
286 /* Ignore everything between [] */
287 for (pl = pm++; *pm != RBRACKET && *pm != EOS; pm++)
291 * We could not find a matching RBRACKET.
292 * Ignore and just look for RBRACE
309 if (i && *pm == COMMA)
312 /* Append the current string */
313 for (lm = ls; (pl < pm); *lm++ = *pl++)
317 * Append the rest of the pattern after the
320 for (pl = pe + 1; (*lm++ = *pl++) != EOS; )
323 /* Expand the current pattern */
325 qprintf("globexp2:", patbuf);
327 rv = globexp1(patbuf, pglob, limitp);
328 if (rv && rv != GLOB_NOMATCH)
331 /* move after the comma, to the next string */
346 * expand tilde from the passwd file.
349 globtilde(const Char *pattern, Char *patbuf, size_t patbuf_len, glob_t *pglob)
356 if (*pattern != TILDE || !(pglob->gl_flags & GLOB_TILDE))
359 /* Copy up to the end of the string or / */
360 eb = &patbuf[patbuf_len - 1];
361 for (p = pattern + 1, h = (char *) patbuf;
362 h < (char *)eb && *p && *p != SLASH; *h++ = *p++)
372 if (((char *) patbuf)[0] == EOS) {
374 * handle a plain ~ or ~/ by expanding $HOME
375 * first and then trying the password file
378 if (issetugid() != 0 || (h = getenv("HOME")) == NULL) {
380 if ((getuid() != geteuid()) || (h = getenv("HOME")) == NULL) {
381 if ((pwd = getpwuid(getuid())) == NULL)
390 if ((pwd = getpwnam((char*) patbuf)) == NULL)
396 /* Copy the home directory */
397 for (b = patbuf; b < eb && *h; *b++ = *h++)
400 /* Append the rest of the pattern */
401 while (b < eb && (*b++ = *p++) != EOS)
409 g_strncmp(const Char *s1, const char *s2, size_t n)
414 rv = *(Char *)s1 - *(const unsigned char *)s2++;
424 g_charclass(const Char **patternp, Char **bufnextp)
426 const Char *pattern = *patternp + 1;
427 Char *bufnext = *bufnextp;
432 if ((colon = g_strchr(pattern, ':')) == NULL || colon[1] != ']')
433 return 1; /* not a character class */
435 len = (size_t)(colon - pattern);
436 for (cc = cclasses; cc->name != NULL; cc++) {
437 if (!g_strncmp(pattern, cc->name, len) && cc->name[len] == '\0')
440 if (cc->name == NULL)
441 return -1; /* invalid character class */
442 *bufnext++ = M_CLASS;
443 *bufnext++ = (Char)(cc - &cclasses[0]);
445 *patternp += len + 3;
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.
458 glob0(const Char *pattern, glob_t *pglob, struct glob_lim *limitp)
460 const Char *qpatnext;
461 int c, err, oldpathc;
462 Char *bufnext, patbuf[MAXPATHLEN];
464 qpatnext = globtilde(pattern, patbuf, MAXPATHLEN, pglob);
465 oldpathc = pglob->gl_pathc;
468 /* We don't need to check for buffer overflow any more. */
469 while ((c = *qpatnext++) != EOS) {
475 if (*qpatnext == EOS ||
476 g_strchr(qpatnext+1, RBRACKET) == NULL) {
477 *bufnext++ = LBRACKET;
487 if (c == LBRACKET && *qpatnext == ':') {
489 err = g_charclass(&qpatnext,
494 } while (c == LBRACKET && *qpatnext == ':');
496 !(pglob->gl_flags & GLOB_NOCHECK))
501 *bufnext++ = CHAR(c);
502 if (*qpatnext == RANGE &&
503 (c = qpatnext[1]) != RBRACKET) {
505 *bufnext++ = CHAR(c);
508 } while ((c = *qpatnext++) != RBRACKET);
509 pglob->gl_flags |= GLOB_MAGCHAR;
513 pglob->gl_flags |= GLOB_MAGCHAR;
517 pglob->gl_flags |= GLOB_MAGCHAR;
518 /* collapse adjacent stars to one,
519 * to avoid exponential behavior
521 if (bufnext == patbuf || bufnext[-1] != M_ALL)
525 *bufnext++ = CHAR(c);
531 qprintf("glob0:", patbuf);
534 if ((err = glob1(patbuf, patbuf+MAXPATHLEN-1, pglob, limitp)) != 0)
538 * If there was no match we are going to append the pattern
539 * if GLOB_NOCHECK was specified or if GLOB_NOMAGIC was specified
540 * and the pattern did not contain any magic characters
541 * GLOB_NOMAGIC is there just for compatibility with csh.
543 if (pglob->gl_pathc == oldpathc) {
544 if ((pglob->gl_flags & GLOB_NOCHECK) ||
545 ((pglob->gl_flags & GLOB_NOMAGIC) &&
546 !(pglob->gl_flags & GLOB_MAGCHAR)))
547 return(globextend(pattern, pglob, limitp, NULL));
549 return(GLOB_NOMATCH);
551 if (!(pglob->gl_flags & GLOB_NOSORT))
552 qsort(pglob->gl_pathv + pglob->gl_offs + oldpathc,
553 pglob->gl_pathc - oldpathc, sizeof(char *), compare);
558 compare(const void *p, const void *q)
560 return(strcmp(*(char **)p, *(char **)q));
564 glob1(Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
566 Char pathbuf[MAXPATHLEN];
568 /* A null pathname is invalid -- POSIX 1003.1 sect. 2.4. */
571 return(glob2(pathbuf, pathbuf+MAXPATHLEN-1,
572 pathbuf, pathbuf+MAXPATHLEN-1,
573 pattern, pattern_last, pglob, limitp));
577 * The functions glob2 and glob3 are mutually recursive; there is one level
578 * of recursion for each segment in the pattern that contains one or more
582 glob2(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
583 Char *pattern, Char *pattern_last, glob_t *pglob, struct glob_lim *limitp)
590 * Loop over pattern segments until end of pattern or until
591 * segment with meta character found.
593 for (anymeta = 0;;) {
594 if (*pattern == EOS) { /* End of pattern? */
596 if (g_lstat(pathbuf, &sb, pglob))
599 if ((pglob->gl_flags & GLOB_LIMIT) &&
600 limitp->glim_stat++ >= GLOB_LIMIT_STAT) {
604 return(GLOB_NOSPACE);
607 if (((pglob->gl_flags & GLOB_MARK) &&
608 pathend[-1] != SEP) && (S_ISDIR(sb.st_mode) ||
609 (S_ISLNK(sb.st_mode) &&
610 (g_stat(pathbuf, &sb, pglob) == 0) &&
611 S_ISDIR(sb.st_mode)))) {
612 if (pathend+1 > pathend_last)
618 return(globextend(pathbuf, pglob, limitp, &sb));
621 /* Find end of next segment, copy tentatively to pathend. */
624 while (*p != EOS && *p != SEP) {
627 if (q+1 > pathend_last)
632 if (!anymeta) { /* No expansion, do next segment. */
635 while (*pattern == SEP) {
636 if (pathend+1 > pathend_last)
638 *pathend++ = *pattern++;
641 /* Need expansion, recurse. */
642 return(glob3(pathbuf, pathbuf_last, pathend,
643 pathend_last, pattern, p, pattern_last,
650 glob3(Char *pathbuf, Char *pathbuf_last, Char *pathend, Char *pathend_last,
651 Char *pattern, Char *restpattern, Char *restpattern_last, glob_t *pglob,
652 struct glob_lim *limitp)
657 char buf[MAXPATHLEN];
660 * The readdirfunc declaration can't be prototyped, because it is
661 * assigned, below, to two functions which are prototyped in glob.h
662 * and dirent.h as taking pointers to differently typed opaque
665 struct dirent *(*readdirfunc)(void *);
667 if (pathend > pathend_last)
672 if ((dirp = g_opendir(pathbuf, pglob)) == NULL) {
673 /* TODO: don't call for ENOENT or ENOTDIR? */
674 if (pglob->gl_errfunc) {
675 if (g_Ctoc(pathbuf, buf, sizeof(buf)))
676 return(GLOB_ABORTED);
677 if (pglob->gl_errfunc(buf, errno) ||
678 pglob->gl_flags & GLOB_ERR)
679 return(GLOB_ABORTED);
686 /* Search directory for matching names. */
687 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
688 readdirfunc = pglob->gl_readdir;
690 readdirfunc = (struct dirent *(*)(void *))readdir;
691 while ((dp = (*readdirfunc)(dirp))) {
695 if ((pglob->gl_flags & GLOB_LIMIT) &&
696 limitp->glim_readdir++ >= GLOB_LIMIT_READDIR) {
700 return(GLOB_NOSPACE);
703 /* Initial DOT must be matched literally. */
704 if (dp->d_name[0] == DOT && *pattern != DOT)
707 sc = (u_char *) dp->d_name;
708 while (dc < pathend_last && (*dc++ = *sc++) != EOS)
710 if (dc >= pathend_last) {
716 if (!match(pathend, pattern, restpattern)) {
720 err = glob2(pathbuf, pathbuf_last, --dc, pathend_last,
721 restpattern, restpattern_last, pglob, limitp);
726 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
727 (*pglob->gl_closedir)(dirp);
735 * Extend the gl_pathv member of a glob_t structure to accommodate a new item,
736 * add the new item, and update gl_pathc.
738 * This assumes the BSD realloc, which only copies the block when its size
739 * crosses a power-of-two boundary; for v7 realloc, this would cause quadratic
742 * Return 0 if new item added, error code if memory couldn't be allocated.
744 * Invariant of the glob_t structure:
745 * Either gl_pathc is zero and gl_pathv is NULL; or gl_pathc > 0 and
746 * gl_pathv points to (gl_offs + gl_pathc + 1) items.
749 globextend(const Char *path, glob_t *pglob, struct glob_lim *limitp,
759 newn = 2 + pglob->gl_pathc + pglob->gl_offs;
760 if (pglob->gl_offs >= INT_MAX ||
761 pglob->gl_pathc >= INT_MAX ||
763 SIZE_MAX / sizeof(*pathv) <= newn ||
764 SIZE_MAX / sizeof(*statv) <= newn) {
766 for (i = pglob->gl_offs; i < (ssize_t)(newn - 2); i++) {
767 if (pglob->gl_pathv && pglob->gl_pathv[i])
768 free(pglob->gl_pathv[i]);
769 if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0 &&
770 pglob->gl_pathv && pglob->gl_pathv[i])
771 free(pglob->gl_statv[i]);
773 if (pglob->gl_pathv) {
774 free(pglob->gl_pathv);
775 pglob->gl_pathv = NULL;
777 if (pglob->gl_statv) {
778 free(pglob->gl_statv);
779 pglob->gl_statv = NULL;
781 return(GLOB_NOSPACE);
784 pathv = realloc(pglob->gl_pathv, newn * sizeof(*pathv));
787 if (pglob->gl_pathv == NULL && pglob->gl_offs > 0) {
788 /* first time around -- clear initial gl_offs items */
789 pathv += pglob->gl_offs;
790 for (i = pglob->gl_offs; --i >= 0; )
793 pglob->gl_pathv = pathv;
795 if ((pglob->gl_flags & GLOB_KEEPSTAT) != 0) {
796 statv = realloc(pglob->gl_statv, newn * sizeof(*statv));
799 if (pglob->gl_statv == NULL && pglob->gl_offs > 0) {
800 /* first time around -- clear initial gl_offs items */
801 statv += pglob->gl_offs;
802 for (i = pglob->gl_offs; --i >= 0; )
805 pglob->gl_statv = statv;
807 statv[pglob->gl_offs + pglob->gl_pathc] = NULL;
809 limitp->glim_malloc += sizeof(**statv);
810 if ((pglob->gl_flags & GLOB_LIMIT) &&
811 limitp->glim_malloc >= GLOB_LIMIT_MALLOC) {
813 return(GLOB_NOSPACE);
815 if ((statv[pglob->gl_offs + pglob->gl_pathc] =
816 malloc(sizeof(**statv))) == NULL)
818 memcpy(statv[pglob->gl_offs + pglob->gl_pathc], sb,
821 statv[pglob->gl_offs + pglob->gl_pathc + 1] = NULL;
824 for (p = path; *p++;)
826 len = (size_t)(p - path);
827 limitp->glim_malloc += len;
828 if ((copy = malloc(len)) != NULL) {
829 if (g_Ctoc(path, copy, len)) {
831 return(GLOB_NOSPACE);
833 pathv[pglob->gl_offs + pglob->gl_pathc++] = copy;
835 pathv[pglob->gl_offs + pglob->gl_pathc] = NULL;
837 if ((pglob->gl_flags & GLOB_LIMIT) &&
838 (newn * sizeof(*pathv)) + limitp->glim_malloc >
841 return(GLOB_NOSPACE);
844 return(copy == NULL ? GLOB_NOSPACE : 0);
849 * pattern matching function for filenames. Each occurrence of the *
850 * pattern causes a recursion level.
853 match(Char *name, Char *pat, Char *patend)
855 int ok, negate_range;
858 while (pat < patend) {
860 switch (c & M_MASK) {
865 if (match(name, pat, patend))
867 } while (*name++ != EOS);
875 if ((k = *name++) == EOS)
877 if ((negate_range = ((*pat & M_MASK) == M_NOT)) != EOS)
879 while (((c = *pat++) & M_MASK) != M_END) {
880 if ((c & M_MASK) == M_CLASS) {
881 Char idx = *pat & M_MASK;
882 if (idx < NCCLASSES &&
883 cclasses[idx].isctype(k))
887 if ((*pat & M_MASK) == M_RNG) {
888 if (c <= k && k <= pat[1])
894 if (ok == negate_range)
903 return(*name == EOS);
906 /* Free allocated data belonging to a glob_t structure. */
908 globfree(glob_t *pglob)
913 if (pglob->gl_pathv != NULL) {
914 pp = pglob->gl_pathv + pglob->gl_offs;
915 for (i = pglob->gl_pathc; i--; ++pp)
918 free(pglob->gl_pathv);
919 pglob->gl_pathv = NULL;
921 if (pglob->gl_statv != NULL) {
922 for (i = 0; i < pglob->gl_pathc; i++) {
923 if (pglob->gl_statv[i] != NULL)
924 free(pglob->gl_statv[i]);
926 free(pglob->gl_statv);
927 pglob->gl_statv = NULL;
932 g_opendir(Char *str, glob_t *pglob)
934 char buf[MAXPATHLEN];
937 strlcpy(buf, ".", sizeof buf);
939 if (g_Ctoc(str, buf, sizeof(buf)))
943 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
944 return((*pglob->gl_opendir)(buf));
946 return(opendir(buf));
950 g_lstat(Char *fn, struct stat *sb, glob_t *pglob)
952 char buf[MAXPATHLEN];
954 if (g_Ctoc(fn, buf, sizeof(buf)))
956 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
957 return((*pglob->gl_lstat)(buf, sb));
958 return(lstat(buf, sb));
962 g_stat(Char *fn, struct stat *sb, glob_t *pglob)
964 char buf[MAXPATHLEN];
966 if (g_Ctoc(fn, buf, sizeof(buf)))
968 if (pglob->gl_flags & GLOB_ALTDIRFUNC)
969 return((*pglob->gl_stat)(buf, sb));
970 return(stat(buf, sb));
974 g_strchr(const Char *str, int ch)
978 return ((Char *)str);
984 g_Ctoc(const Char *str, char *buf, u_int len)
988 if ((*buf++ = *str++) == EOS)
996 qprintf(const char *str, Char *s)
1000 (void)printf("%s:\n", str);
1001 for (p = s; *p; p++)
1002 (void)printf("%c", CHAR(*p));
1004 for (p = s; *p; p++)
1005 (void)printf("%c", *p & M_PROTECT ? '"' : ' ');
1007 for (p = s; *p; p++)
1008 (void)printf("%c", ismeta(*p) ? '_' : ' ');
1013 #endif /* !defined(HAVE_GLOB) || !defined(GLOB_HAS_ALTDIRFUNC) ||
1014 !defined(GLOB_HAS_GL_MATCHC) || !defined(GLOB_HAS_GL_STATV) */