games/boggle/boggle/timer.c

   1 /*      $OpenBSD: timer.c,v 1.15 2016/08/27 02:11:27 guenther Exp $     */
   2 /*      $NetBSD: timer.c,v 1.3 1995/04/24 12:22:45 cgd Exp $    */
   3
   4 /*-
   5  * Copyright (c) 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Barry Brachman.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #include <sys/select.h>
  37 #include <curses.h>
  38 #include <setjmp.h>
  39 #include <time.h>
  40 #include <unistd.h>
  41
  42 #include "extern.h"
  43
  44 static int waitch(long);
  45
  46 /*
  47  * Update the display of the remaining time while waiting for a character
  48  * If time runs out do a longjmp() to the game controlling routine, returning
  49  * non-zero; oth. return the character
  50  * Leave the cursor where it was initially
  51  */
  52 int
  53 timerch(void)
  54 {
  55         time_t prevt, t;
  56         int col, remaining, row;
  57
  58         getyx(stdscr, row, col);
  59         prevt = 0L;
  60         for (;;) {
  61                 if (waitch(1000L) == 1)
  62                         break;
  63                 time(&t);
  64                 if (t == prevt)
  65                         continue;
  66                 prevt = t;
  67                 remaining = tlimit - (int) (t - start_t);
  68                 if (remaining < 0) {
  69                         longjmp(env, 1);
  70                 }
  71                 move(TIMER_LINE, TIMER_COL);
  72                 printw("%d:%02d", remaining / 60, remaining % 60);
  73                 move(row, col);
  74                 refresh();
  75         }
  76         return (inputch());
  77 }
  78
  79 /*
  80  * Wait up to 'delay' microseconds for input to appear
  81  * Returns 1 if input is ready, 0 oth.
  82  */
  83 static int
  84 waitch(long delay)
  85 {
  86         fd_set fdbits;
  87         struct timeval duration;
  88
  89         duration.tv_sec = 0;
  90         duration.tv_usec = delay;
  91         FD_ZERO(&fdbits);
  92         FD_SET(STDIN_FILENO, &fdbits);
  93         return (select(STDIN_FILENO+1, &fdbits, NULL, NULL, &duration));
  94 }
  95
  96 void
  97 delay(int tenths)
  98 {
  99         struct timeval duration;
 100
 101         duration.tv_usec = (tenths % 10 ) * 100000L;
 102         duration.tv_sec = tenths / 10;
 103         select(0, 0, 0, 0, &duration);
 104 }