478 lines
10 KiB
C
478 lines
10 KiB
C
/* $NetBSD: fish.c,v 1.22 2011/09/01 07:18:50 plunky Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Muffy Barkocy.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1990, 1993\
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The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)fish.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: fish.c,v 1.22 2011/09/01 07:18:50 plunky Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <time.h>
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#include <err.h>
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#include "pathnames.h"
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#define RANKS 13
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#define HANDSIZE 7
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#define CARDS 4
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#define TOTCARDS RANKS * CARDS
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#define USER 1
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#define COMPUTER 0
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#define OTHER(a) (1 - (a))
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static const char *const cards[] = {
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"A", "2", "3", "4", "5", "6", "7",
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"8", "9", "10", "J", "Q", "K", NULL,
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};
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#define PRC(card) (void)printf(" %s", cards[card])
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static int promode;
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static int asked[RANKS], comphand[RANKS], deck[TOTCARDS];
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static int userasked[RANKS], userhand[RANKS];
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static int curcard = TOTCARDS;
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static void chkwinner(int, const int *);
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static int compmove(void);
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static int countbooks(const int *);
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static int countcards(const int *);
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static int drawcard(int, int *);
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static int gofish(int, int, int *);
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static void goodmove(int, int, int *, int *);
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static void init(void);
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static void instructions(void);
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static int nrandom(int);
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static void printhand(const int *);
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static void printplayer(int);
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static int promove(void);
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static void usage(void) __dead;
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static int usermove(void);
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int
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main(int argc, char **argv)
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{
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int ch, move;
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/* Revoke setgid privileges */
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setgid(getgid());
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while ((ch = getopt(argc, argv, "p")) != -1)
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switch(ch) {
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case 'p':
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promode = 1;
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break;
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case '?':
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default:
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usage();
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}
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srandom(time(NULL));
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instructions();
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init();
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if (nrandom(2) == 1) {
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printplayer(COMPUTER);
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(void)printf("get to start.\n");
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goto istart;
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}
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printplayer(USER);
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(void)printf("get to start.\n");
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for (;;) {
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move = usermove();
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if (!comphand[move]) {
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if (gofish(move, USER, userhand))
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continue;
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} else {
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goodmove(USER, move, userhand, comphand);
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continue;
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}
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istart: for (;;) {
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move = compmove();
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if (!userhand[move]) {
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if (!gofish(move, COMPUTER, comphand))
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break;
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} else
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goodmove(COMPUTER, move, comphand, userhand);
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}
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}
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/* NOTREACHED */
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}
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static int
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usermove(void)
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{
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int n;
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const char *const *p;
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char buf[256];
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(void)printf("\nYour hand is:");
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printhand(userhand);
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for (;;) {
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(void)printf("You ask me for: ");
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(void)fflush(stdout);
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if (fgets(buf, sizeof(buf), stdin) == NULL)
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exit(0);
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if (buf[0] == '\0')
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continue;
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if (buf[0] == '\n') {
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(void)printf("%d cards in my hand, %d in the pool.\n",
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countcards(comphand), curcard);
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(void)printf("My books:");
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(void)countbooks(comphand);
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continue;
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}
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buf[strlen(buf) - 1] = '\0';
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if (!strcasecmp(buf, "p") && !promode) {
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promode = 1;
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(void)printf("Entering pro mode.\n");
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continue;
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}
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if (!strcasecmp(buf, "quit"))
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exit(0);
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for (p = cards; *p; ++p)
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if (!strcasecmp(*p, buf))
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break;
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if (!*p) {
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(void)printf("I don't understand!\n");
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continue;
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}
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n = p - cards;
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if (userhand[n]) {
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userasked[n] = 1;
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return(n);
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}
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if (nrandom(3) == 1)
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(void)printf("You don't have any of those!\n");
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else
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(void)printf("You don't have any %s's!\n", cards[n]);
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if (nrandom(4) == 1)
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(void)printf("No cheating!\n");
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(void)printf("Guess again.\n");
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}
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/* NOTREACHED */
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}
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static int
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compmove(void)
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{
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static int lmove;
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if (promode)
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lmove = promove();
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else {
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do {
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lmove = (lmove + 1) % RANKS;
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} while (!comphand[lmove] || comphand[lmove] == CARDS);
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}
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asked[lmove] = 1;
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(void)printf("I ask you for: %s.\n", cards[lmove]);
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return(lmove);
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}
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static int
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promove(void)
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{
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int i, max;
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for (i = 0; i < RANKS; ++i)
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if (userasked[i] &&
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comphand[i] > 0 && comphand[i] < CARDS) {
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userasked[i] = 0;
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return(i);
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}
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if (nrandom(3) == 1) {
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for (i = 0;; ++i)
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if (comphand[i] && comphand[i] != CARDS) {
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max = i;
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break;
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}
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while (++i < RANKS)
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if (comphand[i] != CARDS &&
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comphand[i] > comphand[max])
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max = i;
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return(max);
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}
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if (nrandom(1024) == 0723) {
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for (i = 0; i < RANKS; ++i)
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if (userhand[i] && comphand[i])
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return(i);
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}
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for (;;) {
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for (i = 0; i < RANKS; ++i)
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if (comphand[i] && comphand[i] != CARDS &&
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!asked[i])
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return(i);
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for (i = 0; i < RANKS; ++i)
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asked[i] = 0;
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}
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/* NOTREACHED */
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}
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static int
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drawcard(int player, int *hand)
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{
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int card;
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++hand[card = deck[--curcard]];
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if (player == USER || hand[card] == CARDS) {
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printplayer(player);
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(void)printf("drew %s", cards[card]);
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if (hand[card] == CARDS) {
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(void)printf(" and made a book of %s's!\n",
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cards[card]);
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chkwinner(player, hand);
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} else
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(void)printf(".\n");
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}
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return(card);
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}
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static int
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gofish(int askedfor, int player, int *hand)
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{
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printplayer(OTHER(player));
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(void)printf("say \"GO FISH!\"\n");
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if (askedfor == drawcard(player, hand)) {
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printplayer(player);
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(void)printf("drew the guess!\n");
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printplayer(player);
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(void)printf("get to ask again!\n");
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return(1);
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}
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return(0);
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}
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static void
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goodmove(int player, int move, int *hand, int *opphand)
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{
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printplayer(OTHER(player));
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(void)printf("have %d %s%s.\n",
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opphand[move], cards[move], opphand[move] == 1 ? "": "'s");
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hand[move] += opphand[move];
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opphand[move] = 0;
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if (hand[move] == CARDS) {
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printplayer(player);
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(void)printf("made a book of %s's!\n", cards[move]);
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chkwinner(player, hand);
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}
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chkwinner(OTHER(player), opphand);
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printplayer(player);
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(void)printf("get another guess!\n");
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}
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static void
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chkwinner(int player, const int *hand)
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{
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int cb, i, ub;
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for (i = 0; i < RANKS; ++i)
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if (hand[i] > 0 && hand[i] < CARDS)
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return;
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printplayer(player);
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(void)printf("don't have any more cards!\n");
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(void)printf("My books:");
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cb = countbooks(comphand);
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(void)printf("Your books:");
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ub = countbooks(userhand);
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(void)printf("\nI have %d, you have %d.\n", cb, ub);
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if (ub > cb) {
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(void)printf("\nYou win!!!\n");
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if (nrandom(1024) == 0723)
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(void)printf("Cheater, cheater, pumpkin eater!\n");
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} else if (cb > ub) {
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(void)printf("\nI win!!!\n");
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if (nrandom(1024) == 0723)
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(void)printf("Hah! Stupid peasant!\n");
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} else
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(void)printf("\nTie!\n");
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exit(0);
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}
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static void
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printplayer(int player)
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{
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switch (player) {
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case COMPUTER:
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(void)printf("I ");
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break;
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case USER:
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(void)printf("You ");
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break;
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}
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}
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static void
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printhand(const int *hand)
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{
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int book, i, j;
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for (book = i = 0; i < RANKS; i++)
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if (hand[i] < CARDS)
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for (j = hand[i]; --j >= 0;)
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PRC(i);
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else
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++book;
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if (book) {
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(void)printf(" + Book%s of", book > 1 ? "s" : "");
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for (i = 0; i < RANKS; i++)
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if (hand[i] == CARDS)
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PRC(i);
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}
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(void)putchar('\n');
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}
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static int
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countcards(const int *hand)
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{
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int i, count;
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for (count = i = 0; i < RANKS; i++)
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count += *hand++;
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return(count);
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}
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static int
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countbooks(const int *hand)
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{
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int i, count;
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for (count = i = 0; i < RANKS; i++)
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if (hand[i] == CARDS) {
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++count;
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PRC(i);
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}
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if (!count)
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(void)printf(" none");
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(void)putchar('\n');
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return(count);
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}
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static void
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init(void)
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{
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int i, j, temp;
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for (i = 0; i < TOTCARDS; ++i)
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deck[i] = i % RANKS;
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for (i = 0; i < TOTCARDS - 1; ++i) {
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j = nrandom(TOTCARDS-i);
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if (j == 0)
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continue;
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temp = deck[i];
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deck[i] = deck[i+j];
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deck[i+j] = temp;
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}
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for (i = 0; i < HANDSIZE; ++i) {
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++userhand[deck[--curcard]];
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++comphand[deck[--curcard]];
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}
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}
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static int
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nrandom(int n)
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{
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return((int)random() % n);
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}
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static void
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instructions(void)
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{
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int input;
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pid_t pid;
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int fd;
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const char *pager;
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int status;
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(void)printf("Would you like instructions (y or n)? ");
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input = getchar();
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while (getchar() != '\n');
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if (input != 'y')
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return;
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switch (pid = fork()) {
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case 0: /* child */
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if (!isatty(1))
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pager = "cat";
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else {
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if (!(pager = getenv("PAGER")) || (*pager == 0))
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pager = _PATH_MORE;
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}
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if ((fd = open(_PATH_INSTR, O_RDONLY)) == -1)
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err(1, "open %s", _PATH_INSTR);
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if (dup2(fd, 0) == -1)
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err(1, "dup2");
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(void)execl("/bin/sh", "sh", "-c", pager, (char *) NULL);
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err(1, "exec sh -c %s", pager);
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/*NOTREACHED*/
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case -1:
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err(1, "fork");
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/*NOTREACHED*/
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default:
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(void)waitpid(pid, &status, 0);
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break;
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}
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(void)printf("Hit return to continue...\n");
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while ((input = getchar()) != EOF && input != '\n');
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}
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static void
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usage(void)
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{
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(void)fprintf(stderr, "usage: fish [-p]\n");
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exit(1);
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}
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