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3c8f7a26 | 1 | /* $OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $ */ |
b4d02860 | 2 | |
3 | /* | |
3c8f7a26 | 4 | * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com> |
b4d02860 | 5 | * |
510a42ce | 6 | * Permission to use, copy, modify, and distribute this software for any |
7 | * purpose with or without fee is hereby granted, provided that the above | |
8 | * copyright notice and this permission notice appear in all copies. | |
b4d02860 | 9 | * |
510a42ce | 10 | * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
11 | * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF | |
12 | * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR | |
13 | * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES | |
14 | * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN | |
15 | * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF | |
16 | * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. | |
b4d02860 | 17 | */ |
18 | ||
f6d4fb87 | 19 | /* OPENBSD ORIGINAL: lib/libc/gen/dirname.c */ |
20 | ||
b4d02860 | 21 | #include "includes.h" |
22 | #ifndef HAVE_DIRNAME | |
23 | ||
b4d02860 | 24 | #include <errno.h> |
25 | #include <string.h> | |
26 | #include <sys/param.h> | |
27 | ||
28 | char * | |
510a42ce | 29 | dirname(const char *path) |
b4d02860 | 30 | { |
3c8f7a26 | 31 | static char dname[MAXPATHLEN]; |
32 | size_t len; | |
33 | const char *endp; | |
b4d02860 | 34 | |
35 | /* Empty or NULL string gets treated as "." */ | |
36 | if (path == NULL || *path == '\0') { | |
3c8f7a26 | 37 | dname[0] = '.'; |
38 | dname[1] = '\0'; | |
39 | return (dname); | |
b4d02860 | 40 | } |
41 | ||
3c8f7a26 | 42 | /* Strip any trailing slashes */ |
b4d02860 | 43 | endp = path + strlen(path) - 1; |
44 | while (endp > path && *endp == '/') | |
45 | endp--; | |
46 | ||
47 | /* Find the start of the dir */ | |
48 | while (endp > path && *endp != '/') | |
49 | endp--; | |
50 | ||
51 | /* Either the dir is "/" or there are no slashes */ | |
52 | if (endp == path) { | |
3c8f7a26 | 53 | dname[0] = *endp == '/' ? '/' : '.'; |
54 | dname[1] = '\0'; | |
55 | return (dname); | |
b4d02860 | 56 | } else { |
3c8f7a26 | 57 | /* Move forward past the separating slashes */ |
b4d02860 | 58 | do { |
59 | endp--; | |
60 | } while (endp > path && *endp == '/'); | |
61 | } | |
62 | ||
3c8f7a26 | 63 | len = endp - path + 1; |
64 | if (len >= sizeof(dname)) { | |
b4d02860 | 65 | errno = ENAMETOOLONG; |
3c8f7a26 | 66 | return (NULL); |
b4d02860 | 67 | } |
3c8f7a26 | 68 | memcpy(dname, path, len); |
69 | dname[len] = '\0'; | |
70 | return (dname); | |
b4d02860 | 71 | } |
72 | #endif |