Int to string (selfmade)

char* itos(int num)
{
    int len = 0, n = num, m = 0, s = 0, l = 0;
    while(n != 0){ n = n / 10; len ++; } n = num;
    char* buff = (char*)malloc(l = len);
    char* i = buff;

    do
    {
        s = n;
        n = n / 10;
        m = s - n * 10;
        *i++ = 0x30 + m;
    }while(--len>0);

    *i = 0;

    for(int j=0,k=l-1;j<l/2;j++,k--)
        buff[j] ^= buff[k] ^= buff[j] ^= buff[k];

    return buff;
}