io.h

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#ifndef IO_H
#define IO_H
 
#include "types.h"
 
typedef union Key {
    struct {
        Byte character: 8;
        Byte scancode: 7;
        Byte available: 1;
    };
} Key;
 
#pragma GCC diagnostic push
#pragma GCC diagnostic ignored "-Wreturn-type"
#pragma GCC diagnostic ignored "-Wunused-parameter"
 
void putc(Byte character) {
    asm("xor ax, ax\n"
        "mov al, [ebp+8]\n"
        "int 0x20");
}
 
void puts(const int string) {
    asm("mov bx,[ebp+8]\n"
        "int 0x20"::"a"(0x100));
}
 
void puti(int num) {
    asm("cmp dx, 0\n"
        "jge L%=\n"
        "mov ax, '-'\n"
        "int 0x20\n"
        "neg dx\n"
        "L%=:\n"
        "mov bx, dx\n"
        "mov ah, 2\n"
        "int 0x20\n"::"d"(num));
}
 
void printf(const int str, ...) {
    asm("lea bx, [ebp+8]\n"//BX = EBP + 8
        "int 0x20"::"a"(0x0300));
    return;
}
 
Key getc(void) {
    Key key;
    asm("int 0x16"
        :"=a"(key)
        :"a" (0x0));
    return key;
}
 
Key getKeyBuff(void) {
    Key key;
    asm("int 0x16\n"
        "mov bx, 0\n"
        "jz .end\n"
        "mov bx, 1\n"
        ".end:"
        :"=a"(key), "=b"(key.available)
        :"a" (0x0100));
    return key;
}
 
#pragma GCC diagnostic pop
#endif