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
| | #define _BSD_SOURCE
#include <errno.h>
#include <stdlib.h>
#include <string.h>
void *recallocarray(void *ptr, size_t om, size_t m, size_t n)
{
void *newptr;
size_t old_size, new_size;
if (n && m > -1 / n) {
errno = ENOMEM;
return 0;
}
new_size = m * n;
if (n && om > -1 / n) {
errno = EINVAL;
return 0;
}
old_size = om * n;
newptr = calloc(m, n);
if (!newptr)
return ptr;
if (new_size <= old_size) {
memcpy((char *) newptr, ptr, new_size);
}
else {
memcpy((char *) newptr, ptr, old_size);
memset((char *) newptr + old_size, 0, new_size - old_size);
}
memset(ptr, 0, old_size);
free(ptr);
return newptr;
}
|