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 #include <sys/cdefs.h> 20 __FBSDID("$FreeBSD$"); 21 22 #include <errno.h> 23 #include <libgen.h> 24 #include <stdlib.h> 25 #include <string.h> 26 #include <sys/param.h> 27 28 char * __freebsd11_dirname(char *path); 29 30 char * 31 __freebsd11_dirname(char *path) 32 { 33 static char *dname = NULL; 34 size_t len; 35 const char *endp; 36 37 if (dname == NULL) { 38 dname = (char *)malloc(MAXPATHLEN); 39 if (dname == NULL) 40 return(NULL); 41 } 42 43 /* Empty or NULL string gets treated as "." */ 44 if (path == NULL || *path == '\0') { 45 dname[0] = '.'; 46 dname[1] = '\0'; 47 return (dname); 48 } 49 50 /* Strip any trailing slashes */ 51 endp = path + strlen(path) - 1; 52 while (endp > path && *endp == '/') 53 endp--; 54 55 /* Find the start of the dir */ 56 while (endp > path && *endp != '/') 57 endp--; 58 59 /* Either the dir is "/" or there are no slashes */ 60 if (endp == path) { 61 dname[0] = *endp == '/' ? '/' : '.'; 62 dname[1] = '\0'; 63 return (dname); 64 } else { 65 /* Move forward past the separating slashes */ 66 do { 67 endp--; 68 } while (endp > path && *endp == '/'); 69 } 70 71 len = endp - path + 1; 72 if (len >= MAXPATHLEN) { 73 errno = ENAMETOOLONG; 74 return (NULL); 75 } 76 memcpy(dname, path, len); 77 dname[len] = '\0'; 78 return (dname); 79 } 80 81 __sym_compat(dirname, __freebsd11_dirname, FBSD_1.0); 82