#include "program.h"
#include <stddef.h>
#include <stdlib.h>
#include <stdio.h>
struct Program* load_program(char* filename) {
    FILE* f = fopen(filename, "r");
    if (f == NULL) {
        return NULL;
    }
    int num_instructions;
    int num_read = fread(&num_instructions, 4, 1, f);
    if (num_read != 1) {
        return NULL;
    }
    int program_size = 4 + num_instructions * 4;
    struct Program* program = (struct Program *)malloc(program_size);
    program->num_instructions = num_instructions;
    num_read = fread(&program->instructions, 1, program_size-4, f);
    if (num_read != program_size-4) {
        return NULL;
    }
    fclose(f);
    return program;
}