text: /*	$OpenBSD: timer.c,v 1.15 2016/08/27 02:11:27 guenther Exp $	*/
  /*	$NetBSD: timer.c,v 1.3 1995/04/24 12:22:45 cgd Exp $	*/
  
  /*-
   * Copyright (c) 1993
   *	The Regents of the University of California.  All rights reserved.
   *
   * This code is derived from software contributed to Berkeley by
   * Barry Brachman.
   *
   * 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.
   */
  
  #include <sys/select.h>
  #include <curses.h>
  #include <setjmp.h>
  #include <time.h>
  #include <unistd.h>
  
  #include "extern.h"
  
  static int waitch(long);
  
  /*
   * Update the display of the remaining time while waiting for a character
   * If time runs out do a longjmp() to the game controlling routine, returning
   * non-zero; oth. return the character
   * Leave the cursor where it was initially
   */
  int
  timerch(void)
  {
  	time_t prevt, t;
  	int col, remaining, row;
  
  	getyx(stdscr, row, col);
  	prevt = 0L;
  	for (;;) {
  		if (waitch(1000L) == 1)
  			break;
  		time(&t);
  		if (t == prevt)
  			continue;
  		prevt = t;
  		remaining = tlimit - (int) (t - start_t);
  		if (remaining < 0) {
  			longjmp(env, 1);
  		}
  		move(TIMER_LINE, TIMER_COL);
  		printw("%d:%02d", remaining / 60, remaining % 60);
  		move(row, col);
  		refresh();
  	}
  	return (inputch());
  }
  
  /*
   * Wait up to 'delay' microseconds for input to appear
   * Returns 1 if input is ready, 0 oth.
   */
  static int
  waitch(long delay)
  {
  	fd_set fdbits;
  	struct timeval duration;
  
  	duration.tv_sec = 0;
  	duration.tv_usec = delay;
  	FD_ZERO(&fdbits);
  	FD_SET(STDIN_FILENO, &fdbits);
  	return (select(STDIN_FILENO+1, &fdbits, NULL, NULL, &duration));
  }
  
  void
  delay(int tenths)
  {
  	struct timeval duration;
  
  	duration.tv_usec = (tenths % 10 ) * 100000L;
  	duration.tv_sec = tenths / 10;
  	select(0, 0, 0, 0, &duration);
  }
  