105436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* basename.c -- return the last element in a file name 205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 305436638acc7c010349a69c3395f1a57c642dc62Ying Wang Copyright (C) 1990, 1998-2001, 2003-2006, 2009-2012 Free Software 405436638acc7c010349a69c3395f1a57c642dc62Ying Wang Foundation, Inc. 505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 605436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is free software: you can redistribute it and/or modify 705436638acc7c010349a69c3395f1a57c642dc62Ying Wang it under the terms of the GNU General Public License as published by 805436638acc7c010349a69c3395f1a57c642dc62Ying Wang the Free Software Foundation; either version 3 of the License, or 905436638acc7c010349a69c3395f1a57c642dc62Ying Wang (at your option) any later version. 1005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1105436638acc7c010349a69c3395f1a57c642dc62Ying Wang This program is distributed in the hope that it will be useful, 1205436638acc7c010349a69c3395f1a57c642dc62Ying Wang but WITHOUT ANY WARRANTY; without even the implied warranty of 1305436638acc7c010349a69c3395f1a57c642dc62Ying Wang MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 1405436638acc7c010349a69c3395f1a57c642dc62Ying Wang GNU General Public License for more details. 1505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1605436638acc7c010349a69c3395f1a57c642dc62Ying Wang You should have received a copy of the GNU General Public License 1705436638acc7c010349a69c3395f1a57c642dc62Ying Wang along with this program. If not, see <http://www.gnu.org/licenses/>. */ 1805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 1905436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <config.h> 2005436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2105436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include "dirname.h" 2205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2305436638acc7c010349a69c3395f1a57c642dc62Ying Wang#include <string.h> 2405436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2505436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Return the address of the last file name component of NAME. If 2605436638acc7c010349a69c3395f1a57c642dc62Ying Wang NAME has no relative file name components because it is a file 2705436638acc7c010349a69c3395f1a57c642dc62Ying Wang system root, return the empty string. */ 2805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 2905436638acc7c010349a69c3395f1a57c642dc62Ying Wangchar * 3005436638acc7c010349a69c3395f1a57c642dc62Ying Wanglast_component (char const *name) 3105436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 3205436638acc7c010349a69c3395f1a57c642dc62Ying Wang char const *base = name + FILE_SYSTEM_PREFIX_LEN (name); 3305436638acc7c010349a69c3395f1a57c642dc62Ying Wang char const *p; 3405436638acc7c010349a69c3395f1a57c642dc62Ying Wang bool saw_slash = false; 3505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3605436638acc7c010349a69c3395f1a57c642dc62Ying Wang while (ISSLASH (*base)) 3705436638acc7c010349a69c3395f1a57c642dc62Ying Wang base++; 3805436638acc7c010349a69c3395f1a57c642dc62Ying Wang 3905436638acc7c010349a69c3395f1a57c642dc62Ying Wang for (p = base; *p; p++) 4005436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4105436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (ISSLASH (*p)) 4205436638acc7c010349a69c3395f1a57c642dc62Ying Wang saw_slash = true; 4305436638acc7c010349a69c3395f1a57c642dc62Ying Wang else if (saw_slash) 4405436638acc7c010349a69c3395f1a57c642dc62Ying Wang { 4505436638acc7c010349a69c3395f1a57c642dc62Ying Wang base = p; 4605436638acc7c010349a69c3395f1a57c642dc62Ying Wang saw_slash = false; 4705436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 4805436638acc7c010349a69c3395f1a57c642dc62Ying Wang } 4905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5005436638acc7c010349a69c3395f1a57c642dc62Ying Wang return (char *) base; 5105436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 5205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5305436638acc7c010349a69c3395f1a57c642dc62Ying Wang/* Return the length of the basename NAME. Typically NAME is the 5405436638acc7c010349a69c3395f1a57c642dc62Ying Wang value returned by base_name or last_component. Act like strlen 5505436638acc7c010349a69c3395f1a57c642dc62Ying Wang (NAME), except omit all trailing slashes. */ 5605436638acc7c010349a69c3395f1a57c642dc62Ying Wang 5705436638acc7c010349a69c3395f1a57c642dc62Ying Wangsize_t 5805436638acc7c010349a69c3395f1a57c642dc62Ying Wangbase_len (char const *name) 5905436638acc7c010349a69c3395f1a57c642dc62Ying Wang{ 6005436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t len; 6105436638acc7c010349a69c3395f1a57c642dc62Ying Wang size_t prefix_len = FILE_SYSTEM_PREFIX_LEN (name); 6205436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6305436638acc7c010349a69c3395f1a57c642dc62Ying Wang for (len = strlen (name); 1 < len && ISSLASH (name[len - 1]); len--) 6405436638acc7c010349a69c3395f1a57c642dc62Ying Wang continue; 6505436638acc7c010349a69c3395f1a57c642dc62Ying Wang 6605436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (DOUBLE_SLASH_IS_DISTINCT_ROOT && len == 1 6705436638acc7c010349a69c3395f1a57c642dc62Ying Wang && ISSLASH (name[0]) && ISSLASH (name[1]) && ! name[2]) 6805436638acc7c010349a69c3395f1a57c642dc62Ying Wang return 2; 6905436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7005436638acc7c010349a69c3395f1a57c642dc62Ying Wang if (FILE_SYSTEM_DRIVE_PREFIX_CAN_BE_RELATIVE && prefix_len 7105436638acc7c010349a69c3395f1a57c642dc62Ying Wang && len == prefix_len && ISSLASH (name[prefix_len])) 7205436638acc7c010349a69c3395f1a57c642dc62Ying Wang return prefix_len + 1; 7305436638acc7c010349a69c3395f1a57c642dc62Ying Wang 7405436638acc7c010349a69c3395f1a57c642dc62Ying Wang return len; 7505436638acc7c010349a69c3395f1a57c642dc62Ying Wang} 76