Goldfish/Implementation

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Goldfish implementation in C++ by User:Fergusq.

#include <iostream>
#include <fstream>
#include <string>
#include <cstdlib>
using namespace std;

const int SIZE = 10000;
const int HALF = SIZE/2;

int vars[SIZE];
string funcs[SIZE];

int runFunction(int n, int p);

int main(int argc, char * argv[]) {
	if (argc != 2) {
		cerr << "usage: goldfish <file>" << endl;
		return 1;
	}

	ifstream in(argv[1]);

	if (in.is_open()) while (!in.eof()) {
		int n;
		string code;
		char chr;

		in >> n;
		chr = in.get();
		while (chr != '\n' && chr != '\r' && !in.eof()) {
			if (!isspace(chr)) code += chr;
			chr = in.get();
		}

		if (code.length()) {
			funcs[HALF+n] = code;
		}
	} else {
		cerr << "io error" << endl;
		return 1;
	}

	runFunction(0, 0);

	return 0;
}

/**
 * Runs a function
 */
int runFunction(int n, int p) {
	int &v = vars[HALF+n];

	string code = funcs[HALF+n];

	int i = 0;
	while (code[i]) {
		switch (code[i++]) {
		case 'i':
			v++;
			break;
		case 'I':
			p++;
			break;
		case 'd':
			v--;
			break;
		case 'D':
			p--;
			break;
		case 's':
			v *= v;
			break;
		case 'S':
			p *= p;
			break;
		case 'n':
			v=0;
			break;
		case 'N':
			p=0;
			break;
		case 'c':
			v = runFunction(v, p);
			break;
		case 'C':
			v = runFunction(p, v);
			break;
		case 'x':
		case 'X':
			{ int tmp = p; p = v; v = tmp; }break;
		case 'm':
			funcs[HALF+p] = funcs[HALF+v];
			break;
		case 'M':
			funcs[HALF+v] = funcs[HALF+p];
			break;
		case 'o':
			cout << (char)v; cout.flush();
			break;
		case 'O':
			cout << (char)p; cout.flush();
			break;
		case 'r':
			cin >> (char&)v;
			break;
		case 'R':
			cin >> (char&)p;
		break;
		case 'h':
		case 'H':
			exit(0);
			break;
		}
	}
	return v;
}