xref: /openbsd-src/games/hangman/getguess.c (revision 2010f3c835ae4bf769b9e69e53a37d2dfeb4a7e5)

/*	$OpenBSD: getguess.c,v 1.15 2016/01/04 17:33:24 mestre Exp $	*/
/*	$NetBSD: getguess.c,v 1.5 1995/03/23 08:32:43 cgd Exp $	*/

/*
 * Copyright (c) 1983, 1993
 *	The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <ctype.h>
#include <curses.h>
#include <termios.h>
#include <unistd.h>

#include "hangman.h"

/*
 * getguess:
 *	Get another guess
 */
void
getguess(void)
{
	int	i;
	unsigned char	ch, uch;
	bool	correct;

	leaveok(stdscr, FALSE);
	for (;;) {
		move(PROMPTY, PROMPTX + sizeof "Guess: ");
		refresh();
		ch = readch();
		if (isalpha(ch)) {
			if (isupper(ch))
				ch = tolower(ch);
			if (Guessed[ch - 'a']) {
				move(MESGY, MESGX);
				clrtoeol();
				mvprintw(MESGY, MESGX, "Already guessed '%c'",
				    ch);
			} else
				break;
		} else if (isdigit(ch)) {
			if (Guessed[ch - '0' + 26]) {
				move(MESGY, MESGX);
				clrtoeol();
				mvprintw(MESGY, MESGX, "Already guessed '%c'",
				    ch);
			} else
				break;
		} else
			if (ch == CTRL('D'))
				die(0);
			else {
				move(MESGY, MESGX);
				clrtoeol();
				mvprintw(MESGY, MESGX,
				    "Not a valid guess: '%s'", unctrl(ch));
			}
	}
	leaveok(stdscr, TRUE);
	move(MESGY, MESGX);
	clrtoeol();

	if (isalpha(ch))
		Guessed[ch - 'a'] = TRUE;
	else
		Guessed[ch - '0' + 26] = TRUE;
	correct = FALSE;
	uch = toupper(ch);
	for (i = 0; Word[i] != '\0'; i++)
		if (Word[i] == ch) {
			Known[i] = ch;
			correct = TRUE;
		} else if (Word[i] == uch) {
			Known[i] = uch;
			correct = TRUE;
		}
	if (!correct)
		Errors++;
}

/*
 * readch;
 *	Read a character from the input
 */
unsigned char
readch(void)
{
	int	cnt;
	char	ch;

	cnt = 0;
	for (;;) {
		if (read(STDIN_FILENO, &ch, sizeof ch) <= 0) {
			if (++cnt > 100)
				die(0);
		} else
			if (ch == CTRL('L')) {
				wrefresh(curscr);
				mvcur(0, 0, curscr->_cury, curscr->_curx);
			} else
				return ch;
	}
}