#include <stdlib.h>

int ip4_flat(char* value, wchar_t* flat)
{
    unsigned char value_index = 0;
    unsigned char octet_index = 0;
    unsigned char octet_value = 0;
    char flat_index;
    unsigned char value_chara;
    do {
        value_chara = value[value_index];
        if (value_chara >= '0' && value_chara <= '9') {
            octet_value *= 10;
            octet_value += value_chara - '0';
        } else if (value_chara == '.') {
            for (flat_index = (octet_index+1)*8-1; flat_index >= octet_index*8; flat_index--) {
                flat[flat_index] = '0' + (octet_value & 1);
                octet_value >>= 1;
            }
            octet_index++;
            octet_value = 0;
        } else if (value_chara == '\0') {
            if (octet_index != 3) {
                return 1;
            }
            for (flat_index = 31; flat_index >= 24; flat_index--) {
                flat[flat_index] = '0' + (octet_value & 1);
                octet_value >>= 1;
            }
            return 0;
        } else {
            return 1;
        }
        value_index++;
    } while (1); // This ugly thing save one comparison
    return 1;
}