Annotation of prex/usr/lib/libc/gen/dirname.c, Revision 1.1.1.1
1.1 nbrk 1: /*
2: * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com>
3: *
4: * Permission to use, copy, modify, and distribute this software for any
5: * purpose with or without fee is hereby granted, provided that the above
6: * copyright notice and this permission notice appear in all copies.
7: *
8: * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
9: * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
10: * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
11: * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
12: * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
13: * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
14: * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
15: */
16:
17: #include <errno.h>
18: #include <libgen.h>
19: #include <string.h>
20: #include <sys/param.h>
21:
22: char *
23: dirname(const char *path)
24: {
25: static char dname[MAXPATHLEN];
26: size_t len;
27: const char *endp;
28:
29: /* Empty or NULL string gets treated as "." */
30: if (path == NULL || *path == '\0') {
31: dname[0] = '.';
32: dname[1] = '\0';
33: return (dname);
34: }
35:
36: /* Strip any trailing slashes */
37: endp = path + strlen(path) - 1;
38: while (endp > path && *endp == '/')
39: endp--;
40:
41: /* Find the start of the dir */
42: while (endp > path && *endp != '/')
43: endp--;
44:
45: /* Either the dir is "/" or there are no slashes */
46: if (endp == path) {
47: dname[0] = *endp == '/' ? '/' : '.';
48: dname[1] = '\0';
49: return (dname);
50: } else {
51: /* Move forward past the separating slashes */
52: do {
53: endp--;
54: } while (endp > path && *endp == '/');
55: }
56:
57: len = endp - path + 1;
58: if (len >= sizeof(dname)) {
59: errno = ENAMETOOLONG;
60: return (NULL);
61: }
62: memcpy(dname, path, len);
63: dname[len] = '\0';
64: return (dname);
65: }
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