-/* $NetBSD: wump.c,v 1.6 1998/08/30 09:19:41 veego Exp $ */
+/* $NetBSD: wump.c,v 1.20 2006/01/19 21:20:35 garbled Exp $ */
/*
* Copyright (c) 1989, 1993
* 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. Neither the name of the University nor the names of its contributors
+ * 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.
*
#if 0
static char sccsid[] = "@(#)wump.c 8.1 (Berkeley) 5/31/93";
#else
-__RCSID("$NetBSD: wump.c,v 1.6 1998/08/30 09:19:41 veego Exp $");
+__RCSID("$NetBSD: wump.c,v 1.20 2006/01/19 21:20:35 garbled Exp $");
#endif
#endif /* not lint */
* would care to remember.
*/
+#include <err.h>
#include <sys/types.h>
#include <sys/file.h>
+#include <sys/wait.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
+#include <time.h>
#include <unistd.h>
#include "pathnames.h"
char answer[20]; /* user input */
-int bats_nearby __P((void));
-void cave_init __P((void));
-void clear_things_in_cave __P((void));
-void display_room_stats __P((void));
-int getans __P((const char *));
-void initialize_things_in_cave __P((void));
-void instructions __P((void));
-int int_compare __P((const void *, const void *));
-void jump __P((int));
-void kill_wump __P((void));
-int main __P((int, char **));
-int move_to __P((const char *));
-void move_wump __P((void));
-void no_arrows __P((void));
-void pit_kill __P((void));
-int pit_nearby __P((void));
-void pit_survive __P((void));
-int shoot __P((char *));
-void shoot_self __P((void));
-int take_action __P((void));
-void usage __P((void));
-void wump_kill __P((void));
-int wump_nearby __P((void));
+int bats_nearby(void);
+void cave_init(void);
+void clear_things_in_cave(void);
+void display_room_stats(void);
+int gcd(int, int);
+int getans(const char *);
+void initialize_things_in_cave(void);
+void instructions(void);
+int int_compare(const void *, const void *);
+void jump(int);
+void kill_wump(void);
+int main(int, char **);
+int move_to(const char *);
+void move_wump(void);
+void no_arrows(void);
+void pit_kill(void);
+int pit_nearby(void);
+void pit_survive(void);
+int shoot(char *);
+void shoot_self(void);
+int take_action(void);
+void usage(void) __attribute__((__noreturn__));
+void wump_kill(void);
+int wump_nearby(void);
int
main(argc, argv)
int argc;
char **argv;
{
- int c;
+ int c, e=0;
+
+ /* Revoke setgid privileges */
+ setgid(getgid());
#ifdef DEBUG
while ((c = getopt(argc, argv, "a:b:hp:r:t:d")) != -1)
plural(pit_num), arrow_num);
for (;;) {
+ clear_things_in_cave();
initialize_things_in_cave();
arrows_left = arrow_num;
do {
display_room_stats();
(void)printf("Move or shoot? (m-s) ");
(void)fflush(stdout);
- if (!fgets(answer, sizeof(answer), stdin))
+ if (!fgets(answer, sizeof(answer), stdin)) {
+ e=2;
break;
- } while (!take_action());
+ }
+ } while (!(e = take_action()));
- if (!getans("\nCare to play another game? (y-n) "))
+ if (e == 2 || !getans("\nCare to play another game? (y-n) "))
exit(0);
- if (getans("In the same cave? (y-n) "))
- clear_things_in_cave();
- else
+ if (getans("In the same cave? (y-n) ") == 0)
cave_init();
}
/* NOTREACHED */
/* each time you shoot, it's more likely the wumpus moves */
static int lastchance = 2;
- if (random() % level == EASY ? 12 : 9 < (lastchance += 2)) {
+ if (random() % (level == EASY ? 12 : 9) < (lastchance += 2)) {
move_wump();
if (wumpus_loc == player_loc)
wump_kill();
return(0);
}
+int
+gcd(a, b)
+ int a, b;
+{
+ int r;
+
+ r = a % b;
+ if (r == 0)
+ return (b);
+ return (gcd(b, r));
+}
+
void
cave_init()
{
for (j = 0; j < link_num ; ++j)
cave[i].tunnel[j] = -1;
- /* choose a random 'hop' delta for our guaranteed link */
- while (!(delta = random() % room_num));
+ /*
+ * Choose a random 'hop' delta for our guaranteed link.
+ * To keep the cave connected, we need the greatest common divisor
+ * of (delta + 1) and room_num to be 1.
+ */
+ do {
+ delta = (random() % (room_num - 1)) + 1;
+ } while (gcd(room_num, delta + 1) != 1);
for (i = 1; i <= room_num; ++i) {
link = ((i + delta) % room_num) + 1; /* connection */
for (i = 0; i < pit_num; ++i) {
do {
loc = (random() % room_num) + 1;
- } while (cave[loc].has_a_pit && cave[loc].has_a_bat);
+ } while (cave[loc].has_a_pit || cave[loc].has_a_bat);
cave[loc].has_a_pit = 1;
#ifdef DEBUG
if (debug)
(void)printf("<wumpus in room %d>\n", loc);
#endif
+ i = 0;
do {
player_loc = (random() % room_num) + 1;
- } while (player_loc == wumpus_loc || (level == HARD ?
- (link_num / room_num < 0.4 ? wump_nearby() : 0) : 0));
+ i++;
+ } while (player_loc == wumpus_loc || cave[player_loc].has_a_pit ||
+ cave[player_loc].has_a_bat || (level == HARD ?
+ (link_num / room_num < 0.4 ? wump_nearby() : 0) : 0) ||
+ (i > 100 && player_loc != wumpus_loc));
}
int
int_compare(a, b)
const void *a, *b;
{
- return(*(int *)a < *(int *)b ? -1 : 1);
+ return(*(const int *)a < *(const int *)b ? -1 : 1);
}
void
instructions()
{
- char buf[120], *p;
+ const char *pager;
+ pid_t pid;
+ int status;
+ int fd;
/*
* read the instructions file, if needed, and show the user how to
return;
}
- if (!(p = getenv("PAGER")) ||
- strlen(p) > sizeof(buf) + strlen(_PATH_WUMPINFO) + 5)
- p = _PATH_PAGER;
-
- (void)sprintf(buf, "%s %s", p, _PATH_WUMPINFO);
- (void)system(buf);
+ if (!isatty(STDOUT_FILENO))
+ pager = "cat";
+ else {
+ if (!(pager = getenv("PAGER")) || (*pager == 0))
+ pager = _PATH_PAGER;
+ }
+ switch (pid = fork()) {
+ case 0: /* child */
+ if ((fd = open(_PATH_WUMPINFO, O_RDONLY)) == -1)
+ err(1, "open %s", _PATH_WUMPINFO);
+ if (dup2(fd, STDIN_FILENO) == -1)
+ err(1, "dup2");
+ (void)execl("/bin/sh", "sh", "-c", pager, (char *) NULL);
+ err(1, "exec sh -c %s", pager);
+ case -1:
+ err(1, "fork");
+ default:
+ (void)waitpid(pid, &status, 0);
+ break;
+ }
}
void
git.ckatri.com / bsdgames-darwin.git / blobdiff