EMS/kit/kit_safe_memcpy.c

#include <string.h>
#include <errno.h>

int memcpy_s(void *dest, size_t dest_size, const void *src, size_t count) {
    if (!dest || !src) return EINVAL;
    if (count > dest_size) return ERANGE;
    memcpy(dest, src, count);
    return 0;
}