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