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
|
#include <errno.h>
#include <libgen.h>
#include <limits.h>
#include <stdio.h>
#include <string.h>
#include "syscall.h"
int renameat(int oldfd, const char *old, int newfd, const char *new)
{
char old_copy[PATH_MAX+1], new_copy[PATH_MAX+1];
char *base;
if (strlen(old) > PATH_MAX || strlen(new) > PATH_MAX) {
errno = ENAMETOOLONG;
return -1;
}
if (strlen(old) == 0 || strlen(new) == 0) {
errno = ENOENT;
return -1;
}
strcpy(old_copy, old);
strcpy(new_copy, new);
base = basename(old_copy);
strncpy(old_copy, base, sizeof(old_copy));
base = basename(new_copy);
strncpy(new_copy, base, sizeof(new_copy));
if (strcmp(old_copy, ".") == 0 || strcmp(old_copy, "..") == 0 ||
strcmp(new_copy, ".") == 0 || strcmp(new_copy, "..") == 0) {
errno = EINVAL;
return -1;
}
return syscall(SYS_renameat, oldfd, old, newfd, new);
}
|
