paul@0 | 1 | /* |
paul@0 | 2 | * Filesystem path utilities. |
paul@0 | 3 | * |
paul@0 | 4 | * Copyright (C) 2018 Paul Boddie <paul@boddie.org.uk> |
paul@0 | 5 | * |
paul@0 | 6 | * This program is free software; you can redistribute it and/or |
paul@0 | 7 | * modify it under the terms of the GNU General Public License as |
paul@0 | 8 | * published by the Free Software Foundation; either version 2 of |
paul@0 | 9 | * the License, or (at your option) any later version. |
paul@0 | 10 | * |
paul@0 | 11 | * This program is distributed in the hope that it will be useful, |
paul@0 | 12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
paul@0 | 13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
paul@0 | 14 | * GNU General Public License for more details. |
paul@0 | 15 | * |
paul@0 | 16 | * You should have received a copy of the GNU General Public License |
paul@0 | 17 | * along with this program; if not, write to the Free Software |
paul@0 | 18 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, |
paul@0 | 19 | * Boston, MA 02110-1301, USA |
paul@0 | 20 | */ |
paul@0 | 21 | |
paul@0 | 22 | #include <string.h> |
paul@0 | 23 | |
paul@0 | 24 | #include "fspath.h" |
paul@0 | 25 | |
paul@0 | 26 | void rewrite_path(char *path, const char *prefix) |
paul@0 | 27 | { |
paul@0 | 28 | size_t pathlen = strlen(path), |
paul@0 | 29 | prefixlen = strlen(prefix), |
paul@0 | 30 | newpathlen = pathlen - prefixlen; |
paul@0 | 31 | const char *newpath = path + prefixlen; |
paul@0 | 32 | |
paul@0 | 33 | /* Copy the new path (minus the prefix) to the base address. */ |
paul@0 | 34 | |
paul@0 | 35 | memmove(path, newpath, strlen(newpath)); |
paul@0 | 36 | |
paul@0 | 37 | /* Overwrite remaining traces of the old path. Since the new path has been |
paul@0 | 38 | relocated over the prefix, the remaining traces are as long as the |
paul@0 | 39 | prefix. */ |
paul@0 | 40 | |
paul@0 | 41 | memset(path + newpathlen, 0, prefixlen); |
paul@0 | 42 | } |