C swap funtions

#include <stdint.h>
#include <math.h>
#include <assert.h>
#include <memory.h>

inline void swap(void* a, void* b, size_t size) {
    for (; size % sizeof(long); size--) {
        char temp = *(char*)a;
        *(((char*)a)++) = *(char*)b;
        *(((char*)b)++) = temp;
    };
    for (; size; size -= sizeof(long)) {
        long temp = *(long*)a;
        *(((long*)a)++) = *(long*)b;
        *(((long*)b)++) = temp;
    };
}
inline void swap_s(void* a, void* b, size_t size) {
    if (abs((char*)a - b) >= size) {
        long temp;
        for (; size % sizeof(long); size--) {
            temp = *(char*)a;
            *(((char*)a)++) = *(char*)b;
            *(((char*)b)++) = temp;
        };
        for (; size; size -= sizeof(long)) {
            temp = *(long*)a;
            *(((long*)a)++) = *(long*)b;
            *(((long*)b)++) = temp;
        };
    }
}