langatator/src/operate.c

#include <stdio.h>
#include <string.h>
#include "./operate.h"
#include "./types.h"
#include "./utils.h"

int is_operator(char candidate) {
    return (
        candidate == '*' ||
        candidate == '/' ||
        candidate == '+' ||
        candidate == '-' ||
        candidate == '^'
    );
}

int operate(
    unsigned char operator,
    unsigned char typeA, int aRepr,
    unsigned char typeB, int bRepr,
    unsigned char* typeRes, int* resPtr
)
{
 
    if (
        typeA == TYPE_FLOAT || typeB == TYPE_FLOAT ||
        operator == '/'
    ) {
        *typeRes = TYPE_FLOAT;
        float a, b, res;
        if (typeA == TYPE_FLOAT) {
            *((int*) &a) = aRepr;
        }
        if (typeB == TYPE_FLOAT) {
            *((int*) &b) = bRepr;
        }
        if (typeA == TYPE_INT) {
            a = (float) aRepr;
        }
        if (typeB == TYPE_INT) {
            b = (float) bRepr;
        }

        printf("Appling operation: %f %c %f \n", a, operator, b);
        
        if (operator == '+') {
            res = a+b;
        } else if (operator == '-') {
            res = a-b;
        } else if (operator == '*') {
            res = a*b;
        } else if (operator == '/') {
            res = a/b;
        } else if (operator == '^') {
            res = 0;
        } else {
            return 2;
        }
        printf("Got float: %f \n", res);
        // get int representation of float
        *resPtr = *(int *)(&res);
        return 0;
    }
    if (typeA == TYPE_INT && typeB == TYPE_INT) {
        printf("Appling operation %d %c %d \n", aRepr, operator, bRepr);
        *typeRes = TYPE_INT;
        int res = 0;
        if (operator == '+') {
            res = aRepr+bRepr;
        } else if (operator == '-') {
            res = aRepr-bRepr;
        } else if (operator == '*') {
            res = aRepr*bRepr;
        } else if (operator == '^') {
            res = integer_pow(aRepr, bRepr);
        } else {
            return 2;
        }
        *resPtr = res;
        return 0;
    }

    return 3;
}