#include "opcode.h"

//reads an opcode
int readOpcode(char* data, int pos, int max, opcode_t *opcode) {
	if(pos>=max||pos<0) return -1;
	opcode->byte0=data[pos];
	if(opcode->nArgs) { //if we have arguments, read them
		if(pos+1>=max) return -1;
		opcode->byte1=data[pos+1];
		if(opcode->nArgs-1) { //we either have 2 args or an immediate value
			if(pos+2>=max) return -1;
			opcode->byte2=data[pos+2];
			return 3;
		}
		return 2;
	}
	return 1;
}