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| | #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 = om * n, new_size;
if (n && m > -1 / n) {
errno = ENOMEM;
return 0;
}
new_size = m * n;
if (new_size <= old_size) {
memset((char *) ptr + new_size, 0, old_size - new_size);
}
newptr = realloc(ptr, m * n);
if (new_size > old_size) {
memset((char *) ptr + old_size, 0, new_size - old_size);
}
return newptr;
}
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