1 /* $OpenBSD: dirname.c,v 1.13 2005/08/08 08:05:33 espie Exp $ */ 2 3 /* 4 * Copyright (c) 1997, 2004 Todd C. Miller <Todd.Miller@courtesan.com> 5 * 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. 9 * 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. 17 */ 18 19 /* OPENBSD ORIGINAL: lib/libc/gen/dirname.c */ 20 21 #include "includes.h" 22 #ifndef HAVE_DIRNAME 23 24 #include <errno.h> 25 #include <string.h> 26 27 char * 28 dirname(const char *path) 29 { 30 static char dname[MAXPATHLEN]; 31 size_t len; 32 const char *endp; 33 34 /* Empty or NULL string gets treated as "." */ 35 if (path == NULL || *path == '\0') { 36 dname[0] = '.'; 37 dname[1] = '\0'; 38 return (dname); 39 } 40 41 /* Strip any trailing slashes */ 42 endp = path + strlen(path) - 1; 43 while (endp > path && *endp == '/') 44 endp--; 45 46 /* Find the start of the dir */ 47 while (endp > path && *endp != '/') 48 endp--; 49 50 /* Either the dir is "/" or there are no slashes */ 51 if (endp == path) { 52 dname[0] = *endp == '/' ? '/' : '.'; 53 dname[1] = '\0'; 54 return (dname); 55 } else { 56 /* Move forward past the separating slashes */ 57 do { 58 endp--; 59 } while (endp > path && *endp == '/'); 60 } 61 62 len = endp - path + 1; 63 if (len >= sizeof(dname)) { 64 errno = ENAMETOOLONG; 65 return (NULL); 66 } 67 memcpy(dname, path, len); 68 dname[len] = '\0'; 69 return (dname); 70 } 71 #endif 72