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
|
#include <wchar.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
int main(void)
{
const wchar_t in[] = {L'H', L'e', L'l', L'l', L'o', 0};
wchar_t* dest1 = malloc(5*sizeof(wchar_t) + 2);
wchar_t* dest2 = malloc(11*sizeof(wchar_t));
// uninit read
wcpncpy(dest1, dest2, 3);
wchar_t* end = wcpncpy(dest1, in, 3);
assert(3 == end - dest1);
assert(0 == wmemcmp(in , dest1, 3));
end = wcpncpy(dest2, in, 10);
assert(5 == end - dest2);
assert(0 == wmemcmp(dest2 , in, 6));
assert(0 == dest2[9]);
// too small - invalid write
end = wcpncpy(dest1, in, 6);
wcpncpy(dest2, in, 5);
wcpncpy(dest2+5, in, 6);
// overlap
// sss
// ddd
wcpncpy(dest2, dest2+2, 3);
wcpncpy(dest2, in, 5);
wcpncpy(dest2+5, in, 6);
// overlap
// sss
// ddd
wcpncpy(dest2+2, dest2, 3);
free(dest1);
free(dest2);
}
|
