4.3BSD - /usr/src/games/worm.c

   1: /*
   2:  * Copyright (c) 1980 Regents of the University of California.
   3:  * All rights reserved.  The Berkeley software License Agreement
   4:  * specifies the terms and conditions for redistribution.
   5:  */
   6: 
   7: #ifndef lint
   8: char copyright[] =
   9: "@(#) Copyright (c) 1980 Regents of the University of California.\n\
  10:  All rights reserved.\n";
  11: #endif not lint
  12: 
  13: #ifndef lint
  14: static char sccsid[] = "@(#)worm.c	5.2 (Berkeley) 6/25/85";
  15: #endif not lint
  16: 
  17: /*
  18:  * Worm.  Written by Michael Toy
  19:  * UCSC
  20:  */
  21: 
  22: #include <ctype.h>
  23: #include <curses.h>
  24: #include <signal.h>
  25: 
  26: #define newlink() (struct body *) malloc(sizeof (struct body));
  27: #define HEAD '@'
  28: #define BODY 'o'
  29: #define LENGTH 7
  30: #define RUNLEN 8
  31: #define when break;case
  32: #define otherwise break;default
  33: #define CNTRL(p) ('p'-'A'+1)
  34: #ifndef baudrate
  35: # define    baudrate()  _tty.sg_ospeed
  36: #endif
  37: 
  38: WINDOW *tv;
  39: WINDOW *stw;
  40: struct body {
  41:     int x;
  42:     int y;
  43:     struct body *prev;
  44:     struct body *next;
  45: } *head, *tail, goody;
  46: int growing = 0;
  47: int running = 0;
  48: int slow = 0;
  49: int score = 0;
  50: int start_len = LENGTH;
  51: char lastch;
  52: char outbuf[BUFSIZ];
  53: 
  54: main(argc, argv)
  55: char **argv;
  56: {
  57:     int leave(), wake(), suspend();
  58:     char ch;
  59: 
  60:     if (argc == 2)
  61:         start_len = atoi(argv[1]);
  62:     if ((start_len <= 0) || (start_len > 500))
  63:         start_len = LENGTH;
  64:     setbuf(stdout, outbuf);
  65:     srand(getpid());
  66:     signal(SIGALRM, wake);
  67:     signal(SIGINT, leave);
  68:     signal(SIGQUIT, leave);
  69: #ifdef SIGTSTP
  70:     signal(SIGTSTP, suspend);   /* process control signal */
  71: #endif
  72:     initscr();
  73:     crmode();
  74:     noecho();
  75:     slow = (baudrate() <= B1200);
  76:     clear();
  77:     stw = newwin(1, COLS-1, 0, 0);
  78:     tv = newwin(LINES-1, COLS-1, 1, 0);
  79:     box(tv, '*', '*');
  80:     scrollok(tv, FALSE);
  81:     scrollok(stw, FALSE);
  82:     wmove(stw, 0, 0);
  83:     wprintw(stw, " Worm");
  84:     refresh();
  85:     wrefresh(stw);
  86:     wrefresh(tv);
  87:     life();         /* Create the worm */
  88:     prize();        /* Put up a goal */
  89:     while(1)
  90:     {
  91:         if (running)
  92:         {
  93:             running--;
  94:             process(lastch);
  95:         }
  96:         else
  97:         {
  98:             fflush(stdout);
  99:             if (read(0, &ch, 1) >= 0)
 100:             process(ch);
 101:         }
 102:     }
 103: }
 104: 
 105: life()
 106: {
 107:     register struct body *bp, *np;
 108:     register int i;
 109: 
 110:     head = newlink();
 111:     head->x = start_len+2;
 112:     head->y = 12;
 113:     head->next = NULL;
 114:     display(head, HEAD);
 115:     for (i = 0, bp = head; i < start_len; i++, bp = np) {
 116:         np = newlink();
 117:         np->next = bp;
 118:         bp->prev = np;
 119:         np->x = bp->x - 1;
 120:         np->y = bp->y;
 121:         display(np, BODY);
 122:     }
 123:     tail = np;
 124:     tail->prev = NULL;
 125: }
 126: 
 127: display(pos, chr)
 128: struct body *pos;
 129: char chr;
 130: {
 131:     wmove(tv, pos->y, pos->x);
 132:     waddch(tv, chr);
 133: }
 134: 
 135: leave()
 136: {
 137:     endwin();
 138:     exit(0);
 139: }
 140: 
 141: wake()
 142: {
 143:     signal(SIGALRM, wake);
 144:     fflush(stdout);
 145:     process(lastch);
 146: }
 147: 
 148: rnd(range)
 149: {
 150:     return abs((rand()>>5)+(rand()>>5)) % range;
 151: }
 152: 
 153: newpos(bp)
 154: struct body * bp;
 155: {
 156:     do {
 157:         bp->y = rnd(LINES-3)+ 2;
 158:         bp->x = rnd(COLS-3) + 1;
 159:         wmove(tv, bp->y, bp->x);
 160:     } while(winch(tv) != ' ');
 161: }
 162: 
 163: prize()
 164: {
 165:     int value;
 166: 
 167:     value = rnd(9) + 1;
 168:     newpos(&goody);
 169:     waddch(tv, value+'0');
 170:     wrefresh(tv);
 171: }
 172: 
 173: process(ch)
 174: char ch;
 175: {
 176:     register int x,y;
 177:     struct body *nh;
 178: 
 179:     alarm(0);
 180:     x = head->x;
 181:     y = head->y;
 182:     switch(ch)
 183:     {
 184:         when 'h': x--;
 185:         when 'j': y++;
 186:         when 'k': y--;
 187:         when 'l': x++;
 188:         when 'H': x--; running = RUNLEN; ch = tolower(ch);
 189:         when 'J': y++; running = RUNLEN/2; ch = tolower(ch);
 190:         when 'K': y--; running = RUNLEN/2; ch = tolower(ch);
 191:         when 'L': x++; running = RUNLEN; ch = tolower(ch);
 192:         when '\f': setup(); return;
 193:         when CNTRL(Z): suspend(); return;
 194:         when CNTRL(C): crash(); return;
 195:         when CNTRL(D): crash(); return;
 196:         otherwise: if (! running) alarm(1);
 197:                return;
 198:     }
 199:     lastch = ch;
 200:     if (growing == 0)
 201:     {
 202:         display(tail, ' ');
 203:         tail->next->prev = NULL;
 204:         nh = tail->next;
 205:         free(tail);
 206:         tail = nh;
 207:     }
 208:     else growing--;
 209:     display(head, BODY);
 210:     wmove(tv, y, x);
 211:     if (isdigit(ch = winch(tv)))
 212:     {
 213:         growing += ch-'0';
 214:         prize();
 215:         score += growing;
 216:         running = 0;
 217:         wmove(stw, 0, 68);
 218:         wprintw(stw, "Score: %3d", score);
 219:         wrefresh(stw);
 220:     }
 221:     else if(ch != ' ') crash();
 222:     nh = newlink();
 223:     nh->next = NULL;
 224:     nh->prev = head;
 225:     head->next = nh;
 226:     nh->y = y;
 227:     nh->x = x;
 228:     display(nh, HEAD);
 229:     head = nh;
 230:     if (!(slow && running))
 231:         wrefresh(tv);
 232:     if (!running)
 233:         alarm(1);
 234: }
 235: 
 236: crash()
 237: {
 238:     sleep(2);
 239:     clear();
 240:     move(23, 0);
 241:     refresh();
 242:     printf("Well you ran into something and the game is over.\n");
 243:     printf("Your final score was %d\n", score);
 244:     leave();
 245: }
 246: 
 247: suspend()
 248: {
 249:     char *sh;
 250: 
 251:     move(LINES-1, 0);
 252:     refresh();
 253:     endwin();
 254:     fflush(stdout);
 255: #ifdef SIGTSTP
 256:     kill(getpid(), SIGTSTP);
 257:     signal(SIGTSTP, suspend);
 258: #else
 259:     sh = getenv("SHELL");
 260:     if (sh == NULL)
 261:         sh = "/bin/sh";
 262:     system(sh);
 263: #endif
 264:     crmode();
 265:     noecho();
 266:     setup();
 267: }
 268: 
 269: setup()
 270: {
 271:     clear();
 272:     refresh();
 273:     touchwin(stw);
 274:     wrefresh(stw);
 275:     touchwin(tv);
 276:     wrefresh(tv);
 277:     alarm(1);
 278: }

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