forked from micropython/micropython
-
Notifications
You must be signed in to change notification settings - Fork 4
/
realpath.c
67 lines (64 loc) · 2.27 KB
/
realpath.c
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
/*
* This file is part of the MicroPython project, http://micropython.org/
*
* The MIT License (MIT)
*
* Copyright (c) 2013, 2014 Damien P. George
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
// Make sure a path only has forward slashes.
char *to_unix_path(char *p) {
if (p != NULL) {
char *pp = p;
while (*pp != 0) {
if (*pp == '\\') {
*pp = '/';
}
++pp;
}
}
return p;
}
// Implement realpath() using _fullpath and make it use the same error codes as realpath() on unix.
// Also have it return a path with forward slashes only as some code relies on this,
// but _fullpath() returns backward slashes no matter what.
char *realpath(const char *path, char *resolved_path) {
char *ret = NULL;
if (path == NULL) {
errno = EINVAL;
} else if (access(path, R_OK) == 0) {
ret = resolved_path;
if (ret == NULL) {
ret = malloc(_MAX_PATH);
}
if (ret == NULL) {
errno = ENOMEM;
} else {
ret = _fullpath(ret, path, _MAX_PATH);
if (ret == NULL) {
errno = EIO;
}
}
}
return to_unix_path(ret);
}