#include <stdio.h>
#include <stdlib.h>
#include "formats.c"

r* rFormat;
i* iFormat;

void initFunctions() {
    rFormat = (r*)malloc(sizeof(r));
    iFormat = (i*)malloc(sizeof(i));

    rFormat->opcode = 0;
    iFormat->opcode = 0;
}

// -------------------------- R FORMAT INSTRUCTIONS -------------------------- //
char * add(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 32;

    // Unused in add instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * addu(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 33;

    // Unused in addu instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * and(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 36;

    // Unused in and instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * jr(int * args[]) {
    rFormat->rs = *args[0];
    rFormat->funct = 8;

    // Unused in jr instruction.
    rFormat->shamt = 0;
    rFormat->rd = 0;
    rFormat->rt = 0;

    return rToHex(rFormat);
}

char * nor(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 39;

    // Unused in nor instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * or(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 37;

    // Unused in or instruction.
    rFormat->shamt = 0;
    return rToHex(rFormat);
}

char * slt(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 42;

    // Unused in slt instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * sltu(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 43;

    // Unused in sltu instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * sll(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rt = *args[1];
    rFormat->shamt = *args[2];
    rFormat->funct = 0;

    // Unused in sll instruction.
    rFormat->rs = 0;

    return rToHex(rFormat);
}

char * srl(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rt = *args[1];
    rFormat->shamt = *args[2];
    rFormat->funct = 2;

    // Unused in sll instruction.
    rFormat->rs = 0;

    return rToHex(rFormat);
}

char * sub(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 34;

    // Unused in sll instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

char * subu(int * args[]) {
    rFormat->rd = *args[0];
    rFormat->rs = *args[1];
    rFormat->rt = *args[2];
    rFormat->funct = 35;

    // Unused in sll instruction.
    rFormat->shamt = 0;

    return rToHex(rFormat);
}

// -------------------------- I FORMAT INSTRUCTIONS -------------------------- //
char * addi(int * args[]) {
    iFormat->opcode = 8;
    iFormat->rt = *args[0];
    iFormat->rs = *args[1];
    iFormat->immediate = *args[2];

    return iToHex(iFormat);
}

char * addiu(int * args[]) {
    iFormat->opcode = 9;
    iFormat->rt = *args[0];
    iFormat->rs = *args[1];
    iFormat->immediate = *args[2];

    return iToHex(iFormat);
}

char * andi(int * args[]) {
    iFormat->opcode = 12;
    iFormat->rt = *args[0];
    iFormat->rs = *args[1];
    iFormat->immediate = *args[2];

    return iToHex(iFormat);
}

char * beq(int * args[]) {
    iFormat->opcode = 4;
    iFormat->rt = *args[0];
    iFormat->rs = *args[1];
    iFormat->immediate = *args[2];

    return iToHex(iFormat);
}

// -------------------------- J FORMAT INSTRUCTIONS -------------------------- //