projects / apple / libc.git / blame
| Commit | Line | Data |
|---|---|---|
| 224c7076 A |
1 | /* |
| 2 | * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> | |
| 3 | * All rights reserved. | |
| 4 | * | |
| 5 | * Redistribution and use in source and binary forms, with or without | |
| 6 | * modification, are permitted provided that the following conditions | |
| 7 | * are met: | |
| 8 | * 1. Redistributions of source code must retain the above copyright | |
| 9 | * notice, this list of conditions and the following disclaimer. | |
| 10 | * 2. Redistributions in binary form must reproduce the above copyright | |
| 11 | * notice, this list of conditions and the following disclaimer in the | |
| 12 | * documentation and/or other materials provided with the distribution. | |
| 13 | * 3. The name of the author may not be used to endorse or promote products | |
| 14 | * derived from this software without specific prior written permission. | |
| 15 | * | |
| 16 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, | |
| 17 | * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY | |
| 18 | * AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | |
| 19 | * THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, | |
| 20 | * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | |
| 21 | * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; | |
| 22 | * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, | |
| 23 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR | |
| 24 | * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF | |
| 25 | * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | |
| 26 | */ | |
| 27 | ||
| 28 | #if 0 | |
| 29 | #ifndef lint | |
| 30 | static char rcsid[] = "$OpenBSD: dirname.c,v 1.4 1999/05/30 17:10:30 espie Exp $"; | |
| 31 | #endif /* not lint */ | |
| 32 | #endif | |
| 33 | #include <sys/cdefs.h> | |
| 34 | __FBSDID("$FreeBSD: src/lib/libc/gen/dirname.c,v 1.7 2002/12/30 01:41:14 marcel Exp $"); | |
| 35 | ||
| 36 | #include <errno.h> | |
| 37 | #include <libgen.h> | |
| 38 | #include <stdlib.h> | |
| 39 | #include <string.h> | |
| 40 | #include <sys/param.h> | |
| 41 | ||
| 42 | #if __DARWIN_UNIX03 | |
| 43 | #define const /**/ | |
| 44 | #endif | |
| 45 | ||
| 46 | char * | |
| 47 | dirname(path) | |
| 48 | const char *path; | |
| 49 | { | |
| 50 | static char *bname = NULL; | |
| 51 | const char *endp; | |
| 52 | ||
| 53 | if (bname == NULL) { | |
| 54 | bname = (char *)malloc(MAXPATHLEN); | |
| 55 | if (bname == NULL) | |
| 56 | return(NULL); | |
| 57 | } | |
| 58 | ||
| 59 | /* Empty or NULL string gets treated as "." */ | |
| 60 | if (path == NULL || *path == '\0') { | |
| 61 | (void)strcpy(bname, "."); | |
| 62 | return(bname); | |
| 63 | } | |
| 64 | ||
| 65 | /* Strip trailing slashes */ | |
| 66 | endp = path + strlen(path) - 1; | |
| 67 | while (endp > path && *endp == '/') | |
| 68 | endp--; | |
| 69 | ||
| 70 | /* Find the start of the dir */ | |
| 71 | while (endp > path && *endp != '/') | |
| 72 | endp--; | |
| 73 | ||
| 74 | /* Either the dir is "/" or there are no slashes */ | |
| 75 | if (endp == path) { | |
| 76 | (void)strcpy(bname, *endp == '/' ? "/" : "."); | |
| 77 | return(bname); | |
| 78 | } else { | |
| 79 | do { | |
| 80 | endp--; | |
| 81 | } while (endp > path && *endp == '/'); | |
| 82 | } | |
| 83 | ||
| 84 | if (endp - path + 2 > MAXPATHLEN) { | |
| 85 | errno = ENAMETOOLONG; | |
| 86 | return(NULL); | |
| 87 | } | |
| 88 | (void)strncpy(bname, path, endp - path + 1); | |
| 89 | bname[endp - path + 1] = '\0'; | |
| 90 | return(bname); | |
| 91 | } |