1 /* dirname.c -- return all but the last element in a file name 2 3 Copyright (C) 1990, 1998, 2000, 2001, 2003, 2004, 2005 Free Software 4 Foundation, Inc. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 This program is distributed in the hope that it will be useful, 12 but WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program; if not, write to the Free Software Foundation, 18 Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA. */ 19 #include <sys/cdefs.h> 20 __RCSID("$NetBSD: dirname.c,v 1.2 2016/05/17 14:00:09 christos Exp $"); 21 22 23 #ifdef HAVE_CONFIG_H 24 # include <config.h> 25 #endif 26 27 #include "dirname.h" 28 29 #include <string.h> 30 #include "xalloc.h" 31 32 /* Return the length of `dirname (FILE)', or zero if FILE is 33 in the working directory. Works properly even if 34 there are trailing slashes (by effectively ignoring them). */ 35 size_t 36 dir_len (char const *file) 37 { 38 size_t prefix_length = FILE_SYSTEM_PREFIX_LEN (file); 39 size_t length; 40 41 /* Strip the basename and any redundant slashes before it. */ 42 for (length = base_name (file) - file; prefix_length < length; length--) 43 if (! ISSLASH (file[length - 1])) 44 return length; 45 46 /* But don't strip the only slash from "/". */ 47 return prefix_length + ISSLASH (file[prefix_length]); 48 } 49 50 /* Return the leading directories part of FILE, 51 allocated with xmalloc. 52 Works properly even if there are trailing slashes 53 (by effectively ignoring them). */ 54 55 char * 56 dir_name (char const *file) 57 { 58 size_t length = dir_len (file); 59 bool append_dot = (length == FILE_SYSTEM_PREFIX_LEN (file)); 60 char *dir = xmalloc (length + append_dot + 1); 61 memcpy (dir, file, length); 62 if (append_dot) 63 dir[length++] = '.'; 64 dir[length] = 0; 65 return dir; 66 } 67 68 #ifdef TEST_DIRNAME 69 /* 70 71 Run the test like this (expect no output): 72 gcc -DHAVE_CONFIG_H -DTEST_DIRNAME -I.. -O -Wall \ 73 basename.c dirname.c xmalloc.c error.c 74 sed -n '/^BEGIN-DATA$/,/^END-DATA$/p' dirname.c|grep -v DATA|./a.out 75 76 If it's been built on a DOS or Windows platforms, run another test like 77 this (again, expect no output): 78 sed -n '/^BEGIN-DOS-DATA$/,/^END-DOS-DATA$/p' dirname.c|grep -v DATA|./a.out 79 80 BEGIN-DATA 81 foo//// . 82 bar/foo//// bar 83 foo/ . 84 / / 85 . . 86 a . 87 END-DATA 88 89 BEGIN-DOS-DATA 90 c:///// c:/ 91 c:/ c:/ 92 c:/. c:/ 93 c:foo c:. 94 c:foo/bar c:foo 95 END-DOS-DATA 96 97 */ 98 99 # define MAX_BUFF_LEN 1024 100 # include <stdio.h> 101 102 char *program_name; 103 104 int 105 main (int argc, char *argv[]) 106 { 107 char buff[MAX_BUFF_LEN + 1]; 108 109 program_name = argv[0]; 110 111 buff[MAX_BUFF_LEN] = 0; 112 while (fgets (buff, MAX_BUFF_LEN, stdin) && buff[0]) 113 { 114 char file[MAX_BUFF_LEN]; 115 char expected_result[MAX_BUFF_LEN]; 116 char const *result; 117 sscanf (buff, "%s %s", file, expected_result); 118 result = dir_name (file); 119 if (strcmp (result, expected_result)) 120 printf ("%s: got %s, expected %s\n", file, result, expected_result); 121 } 122 return 0; 123 } 124 #endif 125