extern fn puts(message: *char) -> i32;
extern fn malloc(size: u64) -> *u8;
extern fn free(ptr: *u8);
extern fn div(numerator: i32, denominator: i32) -> div_t;

struct div_t {
    quotient: i32,
    remainder: i32,
}

pub fn print(message: &String) {
    puts(*message.inner);
}

pub fn int_div(numerator: i32, denominator: i32) -> div_t {
    return div(numerator, denominator);
}

pub fn allocate(size: u64) -> *u8 {
    malloc(size)
}

struct String {
    inner: *char,
    length: u64,
    max_length: u64,
}

pub fn new_string() -> String {
    String {
        inner: allocate(0),
        length: 0,
    }
}

pub fn add_char(string: &mut String, c: char) {
    if ((*string).length + 1) >= (*string).max_length {
        free((*string).inner as *u8);
        (*string).max_length = (*string).max_length + 4;
        (*string).inner = allocate((*string).max_length) as *char;
    }
    (*string).inner[(*string).length] = c;
    (((*string).inner) as *u8)[((*string).length + 1)] = 0;
    (*string).length = (*string).length + 1;
}

pub fn free_string(string: &mut String) {
    free((*string).inner as *u8);
}