gistfile1.c

// Only works for constants and arrays, so watch out.
#define write(s) syscall_write(1, s, sizeof(s))

void write_char(char c) {
    syscall_write(1, &c, 1);
}

void write_int(int n) {
    int k, leading_zeros, div;

    if (n == 0) {
        write_char('0');
        return;
    }

    if (n < 0) {
        write("-");
        n *= -1;
    }

    k = 1000000000;
    leading_zeros = 1;
    while (k > 0) {
        div = n / k;
        if (leading_zeros && div != 0) {
            leading_zeros = 0;
        }
        if (!leading_zeros) {
            write_char(div + '0');
        }
        n %= k;
        k /= 10;
    }
}

Et systemkald per tegn? Ad