1 /*
2 * Copyright (c) 2024 Huawei Device Co., Ltd.
3 * Licensed under the Apache License, Version 2.0 (the "License");
4 * you may not use this file except in compliance with the License.
5 * You may obtain a copy of the License at
6 *
7 * http://www.apache.org/licenses/LICENSE-2.0
8 *
9 * Unless required by applicable law or agreed to in writing, software
10 * distributed under the License is distributed on an "AS IS" BASIS,
11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 * See the License for the specific language governing permissions and
13 * limitations under the License.
14 */
15
16 #include <stdlib.h>
17 #include <limits.h>
18 #include <sys/stat.h>
19 #include <fcntl.h>
20 #include <errno.h>
21 #include <unistd.h>
22 #include <string.h>
23 #include "syscall.h"
24
realpath(const char * restrict filename,char * restrict resolved)25 char *realpath(const char *restrict filename, char *restrict resolved)
26 {
27 int ret;
28 char tmp[PATH_MAX];
29
30 if (!filename) {
31 errno = EINVAL;
32 return 0;
33 }
34
35 ret = syscall(SYS_realpath, filename, tmp);
36 if (ret < 0) return 0;
37
38 return resolved ? strcpy(resolved, tmp) : strdup(tmp);
39 }
40