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