blob: f87d95cd3a8dabd92c0b278c02757e38caf1818a (
plain)
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
|
#include <errno.h> // for EINVAL, ERANGE
#include <stddef.h> // for NULL, errno_t
#include <string.h> // for rsize_t, memcpy, size_t, memcpy_s
#include <sys/cdefs.h>
__weak void *memcpy(void *restrict s1, const void *restrict s2, size_t n);
void *memcpy(void *restrict s1, const void *restrict s2, size_t n)
{
unsigned char *dest = (unsigned char *)s1;
const unsigned char *src = (const unsigned char *)s2;
while (n--) {
*dest++ = *src++;
}
return s1;
}
errno_t memcpy_s(void *restrict dest, rsize_t destsz, const void *restrict src, rsize_t count)
{
if (dest == NULL || src == NULL) {
if (dest != NULL && destsz > 0) {
unsigned char *d = dest;
for (rsize_t i = 0; i < destsz; i++) {
d[i] = 0;
}
}
return EINVAL;
}
const unsigned char *s = src;
unsigned char *d = dest;
if ((d > s && d < s + count) || (s > d && s < d + count)) {
for (rsize_t i = 0; i < destsz; i++) {
d[i] = 0;
}
return EINVAL;
}
if (count > destsz) {
for (rsize_t i = 0; i < destsz; i++) {
d[i] = 0;
}
return ERANGE;
}
for (rsize_t i = 0; i < count; i++) {
d[i] = s[i];
}
return 0;
}
|
