extern printf = (*i8, varargs) => void;
extern exit = (i64) => void;

let strcmp = (stra: *i8, strb: *i8) => bool {
	let i = 0;
	while true {
		let ca = (*(stra + cast(*i8, i)));
		let cb = (*(strb + cast(*i8, i)));

		if ca == '\0' {
			return cb == '\0';
		};
		
		if cb == '\0' {
			return ca == '\0';
		};

		if !(ca == cb) {
			return false;
		};

		i = i + 1;
	};

	return true;
};

let isdigit = (c: i8) => bool {
	if c >= '0' {
		if c <= '9' {
			return true;
		};
	};
	return false;
};

let isalpha = (c: i8) => bool {
	if c >= 'a' {
		if c <= 'z' {
			return true;
		};
	};
	if c >= 'A' {
		if c <= 'Z' {
			return true;
		};
	};
	return false;
};

let isalphanum = (c: i8) => bool {
	if isalpha(c) {
		return true;
	};
	if isdigit(c) {
		return true;
	};

	return false;
};

let iswhitespace = (c: i8) => bool {
	if c == ' ' {
		return true;
	};

	if c >= '\t' {
		if c <= '\r' {
			return true;
		};
	};

	return false;
};

let assert = (cond: bool) => void {
	if !cond {
		printf("ASSERTION FAILED\n");
		exit(1);
	};

	return;
};