1/* Return the name-within-directory of a file name. 2 Copyright (C) 1996-1999, 2000-2002, 2004, 2006 Free Software Foundation, Inc. 3 4 NOTE: The canonical source of this file is maintained with the GNU C Library. 5 Bugs can be reported to bug-glibc@gnu.org. 6 7 This program is free software; you can redistribute it and/or modify it 8 under the terms of the GNU General Public License as published by the 9 Free Software Foundation; either version 2, or (at your option) any 10 later version. 11 12 This program is distributed in the hope that it will be useful, 13 but WITHOUT ANY WARRANTY; without even the implied warranty of 14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 15 GNU General Public License for more details. 16 17 You should have received a copy of the GNU General Public License 18 along with this program; if not, write to the Free Software 19 Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, 20 USA. */ 21 22#include <config.h> 23 24/* Specification. */ 25#include "basename.h" 26 27#if !(__GLIBC__ >= 2) 28 29#include <stdio.h> 30#include <assert.h> 31 32#if defined _WIN32 || defined __WIN32__ || defined __CYGWIN__ || defined __EMX__ || defined __DJGPP__ 33 /* Win32, Cygwin, OS/2, DOS */ 34# define HAS_DEVICE(P) \ 35 ((((P)[0] >= 'A' && (P)[0] <= 'Z') || ((P)[0] >= 'a' && (P)[0] <= 'z')) \ 36 && (P)[1] == ':') 37# define FILE_SYSTEM_PREFIX_LEN(P) (HAS_DEVICE (P) ? 2 : 0) 38# define ISSLASH(C) ((C) == '/' || (C) == '\\') 39#endif 40 41#ifndef FILE_SYSTEM_PREFIX_LEN 42# define FILE_SYSTEM_PREFIX_LEN(Filename) 0 43#endif 44 45#ifndef ISSLASH 46# define ISSLASH(C) ((C) == '/') 47#endif 48 49#ifndef _LIBC 50/* We cannot generally use the name `basename' since XPG defines an unusable 51 variant of the function but we cannot use it. */ 52# undef basename 53# define basename gnu_basename 54#endif 55 56/* In general, we can't use the builtin `basename' function if available, 57 since it has different meanings in different environments. 58 In some environments the builtin `basename' modifies its argument. 59 If NAME is all slashes, be sure to return `/'. */ 60 61char * 62basename (char const *name) 63{ 64 char const *base = name += FILE_SYSTEM_PREFIX_LEN (name); 65 int all_slashes = 1; 66 char const *p; 67 68 for (p = name; *p; p++) 69 { 70 if (ISSLASH (*p)) 71 base = p + 1; 72 else 73 all_slashes = 0; 74 } 75 76 /* If NAME is all slashes, arrange to return `/'. */ 77 if (*base == '\0' && ISSLASH (*name) && all_slashes) 78 --base; 79 80 /* Make sure the last byte is not a slash. */ 81 assert (all_slashes || !ISSLASH (*(p - 1))); 82 83 return (char *) base; 84} 85 86#endif 87