OpenBSD-4.6/games/worm/worm.c
/* $OpenBSD: worm.c,v 1.22 2004/11/29 08:52:29 jsg Exp $ */
/*
* Copyright (c) 1980, 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.
*/
#ifndef lint
static char copyright[] =
"@(#) Copyright (c) 1980, 1993\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#if 0
static char sccsid[] = "@(#)worm.c 8.1 (Berkeley) 5/31/93";
#else
static char rcsid[] = "$OpenBSD: worm.c,v 1.22 2004/11/29 08:52:29 jsg Exp $";
#endif
#endif /* not lint */
/*
* Worm. Written by Michael Toy
* UCSC
*/
#include <sys/types.h>
#include <ctype.h>
#include <curses.h>
#include <err.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#define HEAD '@'
#define BODY 'o'
#define LENGTH 7
#define RUNLEN 8
#define CNTRL(p) (p-'A'+1)
WINDOW *tv;
WINDOW *stw;
struct body {
int x;
int y;
struct body *prev;
struct body *next;
} *head, *tail, goody;
int growing = 0;
int running = 0;
int slow = 0;
int score = 0;
int start_len = LENGTH;
int visible_len;
int lastch;
char outbuf[BUFSIZ];
volatile sig_atomic_t wantleave = 0;
volatile sig_atomic_t wantsuspend = 0;
void crash(void);
void display(struct body *, char);
void leave(int);
void life(void);
void newpos(struct body *);
struct body *newlink(void);
void process(int);
void prize(void);
int rnd(int);
void setup(void);
void suspend(int);
int
main(int argc, char **argv)
{
int retval;
struct timeval t, tod;
struct timezone tz;
fd_set rset;
FD_ZERO(&rset);
setbuf(stdout, outbuf);
srandomdev();
signal(SIGINT, leave);
signal(SIGQUIT, leave);
signal(SIGTSTP, suspend); /* process control signal */
initscr();
cbreak();
noecho();
keypad(stdscr, TRUE);
slow = (baudrate() <= 1200);
clear();
if (COLS < 18 || LINES < 5) {
endwin();
errx(1, "screen too small");
}
if (argc == 2)
start_len = atoi(argv[1]);
if ((start_len <= 0) || (start_len > ((LINES-3) * (COLS-2)) / 3))
start_len = LENGTH;
stw = newwin(1, COLS-1, 0, 0);
tv = newwin(LINES-1, COLS-1, 1, 0);
box(tv, '*', '*');
scrollok(tv, FALSE);
scrollok(stw, FALSE);
wmove(stw, 0, 0);
wprintw(stw, " Worm");
refresh();
wrefresh(stw);
wrefresh(tv);
life(); /* Create the worm */
prize(); /* Put up a goal */
while(1)
{
if (wantleave) {
endwin(); /* XXX signal race */
exit(0);
}
if (wantsuspend) {
move(LINES-1, 0);
refresh();
endwin();
fflush(stdout);
kill(getpid(), SIGSTOP);
signal(SIGTSTP, suspend);
cbreak();
noecho();
setup();
wantsuspend = 0;
}
if (running)
{
running--;
process(lastch);
}
else
{
/* fflush(stdout); */
/* Delay could be a command line option */
t.tv_sec = 1;
t.tv_usec = 0;
(void)gettimeofday(&tod, &tz);
FD_SET(STDIN_FILENO, &rset);
retval = select(STDIN_FILENO + 1, &rset, NULL, NULL, &t);
if (retval > 0)
process(getch());
else
process(lastch);
}
}
}
void
life(void)
{
struct body *bp, *np;
int i,j = 1;
head = newlink();
head->x = start_len % (COLS-5) + 2;
head->y = LINES / 2;
head->next = NULL;
display(head, HEAD);
for (i = 0, bp = head; i < start_len; i++, bp = np) {
np = newlink();
np->next = bp;
bp->prev = np;
if (((bp->x <= 2) && (j == 1)) || ((bp->x >= COLS-4) && (j == -1))) {
j *= -1;
np->x = bp->x;
np->y = bp->y + 1;
} else {
np->x = bp->x - j;
np->y = bp->y;
}
display(np, BODY);
}
tail = np;
tail->prev = NULL;
visible_len = start_len + 1;
}
void
display(struct body *pos, char chr)
{
wmove(tv, pos->y, pos->x);
waddch(tv, chr);
}
void
leave(int dummy)
{
wantleave = 1;
}
int
rnd(int range)
{
return random() % range;
}
void
newpos(struct body *bp)
{
if (visible_len == (LINES-3) * (COLS-3) - 1) {
endwin();
printf("\nYou won!\nYour final score was %d\n\n", score);
exit(0);
}
do {
bp->y = rnd(LINES-3)+ 1;
bp->x = rnd(COLS-3) + 1;
wmove(tv, bp->y, bp->x);
} while(winch(tv) != ' ');
}
void
prize(void)
{
int value;
value = rnd(9) + 1;
newpos(&goody);
waddch(tv, value+'0');
wrefresh(tv);
}
void
process(int ch)
{
int x,y;
struct body *nh;
x = head->x;
y = head->y;
switch(ch)
{
#ifdef KEY_LEFT
case KEY_LEFT:
#endif
case 'h':
x--; break;
#ifdef KEY_DOWN
case KEY_DOWN:
#endif
case 'j':
y++; break;
#ifdef KEY_UP
case KEY_UP:
#endif
case 'k':
y--; break;
#ifdef KEY_RIGHT
case KEY_RIGHT:
#endif
case 'l':
x++; break;
case 'H': x--; running = RUNLEN; ch = tolower(ch); break;
case 'J': y++; running = RUNLEN/2; ch = tolower(ch); break;
case 'K': y--; running = RUNLEN/2; ch = tolower(ch); break;
case 'L': x++; running = RUNLEN; ch = tolower(ch); break;
case '\f': setup(); return;
case CNTRL('Z'): suspend(0); return;
case CNTRL('C'): crash(); return;
case CNTRL('D'): crash(); return;
case ERR: leave(0); return;
default: return;
}
lastch = ch;
if (growing == 0)
{
display(tail, ' ');
tail->next->prev = NULL;
nh = tail->next;
free(tail);
tail = nh;
visible_len--;
}
else growing--;
display(head, BODY);
wmove(tv, y, x);
if (isdigit(ch = winch(tv)))
{
growing += ch-'0';
prize();
score += growing;
running = 0;
wmove(stw, 0, COLS - 12);
wprintw(stw, "Score: %3d", score);
wrefresh(stw);
}
else if(ch != ' ') crash();
nh = newlink();
nh->next = NULL;
nh->prev = head;
head->next = nh;
nh->y = y;
nh->x = x;
display(nh, HEAD);
head = nh;
visible_len++;
if (!(slow && running)) {
wmove(tv, head->y, head->x);
wrefresh(tv);
}
}
struct body *
newlink(void)
{
struct body *tmp;
if ((tmp = (struct body *) malloc(sizeof (struct body))) == NULL) {
endwin();
errx(1, "out of memory");
}
return (tmp);
}
void
crash(void)
{
sleep(2);
clear();
endwin();
printf("Well, you ran into something and the game is over.\n");
printf("Your final score was %d\n", score);
exit(0); /* leave() calls endwin(), which would hose the printf()'s */
}
void
suspend(int dummy)
{
wantsuspend = 1;
}
void
setup(void)
{
clear();
refresh();
touchwin(stw);
wrefresh(stw);
touchwin(tv);
wrefresh(tv);
}