1 /* 2 * Filesystem path utilities. 3 * 4 * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk> 5 * 6 * This program is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU General Public License as 8 * published by the Free Software Foundation; either version 2 of 9 * the License, or (at your option) 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 18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, 19 * Boston, MA 02110-1301, USA 20 */ 21 22 #include <string.h> 23 24 #include "fspath.h" 25 26 void rewrite_path(char *path, const char *prefix) 27 { 28 size_t pathlen = strlen(path), 29 prefixlen = strlen(prefix), 30 newpathlen = pathlen - prefixlen; 31 const char *newpath = path + prefixlen; 32 33 /* Copy the new path (minus the prefix) to the base address. */ 34 35 memmove(path, newpath, strlen(newpath)); 36 37 /* Overwrite remaining traces of the old path. Since the new path has been 38 relocated over the prefix, the remaining traces are as long as the 39 prefix. */ 40 41 memset(path + newpathlen, 0, prefixlen); 42 }