1 /* OPENBSD ORIGINAL: lib/libc/gen/dirname.c */ 2 3 /* $OpenBSD: dirname.c,v 1.10 2003/06/17 21:56:23 millert Exp $ */ 4 5 /* 6 * Copyright (c) 1997 Todd C. Miller <Todd.Miller@courtesan.com> 7 * 8 * Permission to use, copy, modify, and distribute this software for any 9 * purpose with or without fee is hereby granted, provided that the above 10 * copyright notice and this permission notice appear in all copies. 11 * 12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES 13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF 14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR 15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES 16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN 17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF 18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. 19 */ 20 21 #include "includes.h" 22 #ifndef HAVE_DIRNAME 23 24 #ifndef lint 25 static char rcsid[] = "$OpenBSD: dirname.c,v 1.10 2003/06/17 21:56:23 millert Exp $"; 26 #endif /* not lint */ 27 28 #include <errno.h> 29 #include <string.h> 30 #include <sys/param.h> 31 32 char * 33 dirname(const char *path) 34 { 35 static char bname[MAXPATHLEN]; 36 register const char *endp; 37 38 /* Empty or NULL string gets treated as "." */ 39 if (path == NULL || *path == '\0') { 40 (void)strlcpy(bname, ".", sizeof bname); 41 return(bname); 42 } 43 44 /* Strip trailing slashes */ 45 endp = path + strlen(path) - 1; 46 while (endp > path && *endp == '/') 47 endp--; 48 49 /* Find the start of the dir */ 50 while (endp > path && *endp != '/') 51 endp--; 52 53 /* Either the dir is "/" or there are no slashes */ 54 if (endp == path) { 55 (void)strlcpy(bname, *endp == '/' ? "/" : ".", sizeof bname); 56 return(bname); 57 } else { 58 do { 59 endp--; 60 } while (endp > path && *endp == '/'); 61 } 62 63 if (endp - path + 2 > sizeof(bname)) { 64 errno = ENAMETOOLONG; 65 return(NULL); 66 } 67 strlcpy(bname, path, endp - path + 2); 68 return(bname); 69 } 70 #endif 71