if (s == NULL) return;
static void rlogin_size(void){    char b[12] = { '\xFF', '\xFF', 0x73, 0x73, 0, 0, 0, 0, 0, 0, 0, 0 };    b[6] = cols >> 8;    b[7] = cols & 0xFF;    b[4] = rows >> 8;    b[5] = rows & 0xFF;    rlogin_bufsize = sk_write(s, b, 12);    return;}