usr.bin/leave/leave.c

   1 /*      $NetBSD: leave.c,v 1.15 2011/09/16 15:39:27 joerg Exp $ */
   2
   3 /*
   4  * Copyright (c) 1980, 1988, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #ifndef lint
  34 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
  35  The Regents of the University of California.  All rights reserved.");
  36 #endif /* not lint */
  37
  38 #ifndef lint
  39 #if 0
  40 static char sccsid[] = "@(#)leave.c     8.1 (Berkeley) 6/6/93";
  41 #else
  42 __RCSID("$NetBSD: leave.c,v 1.15 2011/09/16 15:39:27 joerg Exp $");
  43 #endif
  44 #endif /* not lint */
  45
  46 #include <sys/param.h>
  47 #include <sys/time.h>
  48 #include <ctype.h>
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <time.h>
  52 #include <err.h>
  53 #include <unistd.h>
  54
  55 #define SECOND  1
  56 #define MINUTE  (SECOND * 60)
  57 #define HOUR    (MINUTE * 60)
  58
  59 /*
  60  * leave [[+]hhmm]
  61  *
  62  * Reminds you when you have to leave.
  63  * Leave prompts for input and goes away if you hit return.
  64  * It nags you like a mother hen.
  65  */
  66
  67 __dead static void doalarm(u_int);
  68 __dead static void usage(void);
  69
  70 int
  71 main(int argc, char **argv)
  72 {
  73         u_int secs;
  74         int hours, minutes;
  75         char c, *cp;
  76         struct tm *t = NULL;
  77         time_t now;
  78         int plusnow;
  79         char buf[50];
  80
  81         if (setvbuf(stdout, NULL, _IONBF, 0) != 0)
  82                 errx(1, "Cannot set stdout to unbuffered.");
  83
  84         if (argc < 2) {
  85                 (void)puts("When do you have to leave? ");
  86                 cp = fgets(buf, sizeof(buf), stdin);
  87                 if (cp == NULL || *cp == '\n')
  88                         exit(0);
  89         } else
  90                 cp = argv[1];
  91
  92         if (*cp == '+') {
  93                 plusnow = 1;
  94                 ++cp;
  95         } else {
  96                 plusnow = 0;
  97                 (void)time(&now);
  98                 t = localtime(&now);
  99         }
 100
 101         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
 102                 if (!isdigit((unsigned char)c))
 103                         usage();
 104                 hours = hours * 10 + (c - '0');
 105         }
 106         minutes = hours % 100;
 107         hours /= 100;
 108
 109         if (minutes < 0 || minutes > 59)
 110                 usage();
 111         if (plusnow)
 112                 secs = (hours * HOUR) + (minutes * MINUTE);
 113         else {
 114                 if (hours > 23)
 115                         usage();
 116                 if (t->tm_hour >= 12)
 117                         t->tm_hour -= 12;
 118                 if (hours >= 12)
 119                         hours -= 12;
 120                 if (t->tm_hour > hours ||
 121                     (t->tm_hour == hours && minutes <= t->tm_min))
 122                         hours += 12;
 123                 secs = (hours - t->tm_hour) * HOUR;
 124                 secs += (minutes - t->tm_min) * MINUTE;
 125         }
 126         doalarm(secs);
 127         exit(0);
 128 }
 129
 130 static void
 131 doalarm(u_int secs)
 132 {
 133         int bother;
 134         time_t daytime;
 135
 136         switch (fork()) {
 137         case 0:
 138                 break;
 139         case -1:
 140                 err(1, "Fork failed");
 141                 /*NOTREACHED*/
 142         default:
 143                 exit(0);
 144         }
 145
 146         (void)time(&daytime);
 147         daytime += secs;
 148         printf("Alarm set for %.16s. (pid %u)\n",
 149             ctime(&daytime), (unsigned)getpid());
 150
 151         /*
 152          * if write fails, we've lost the terminal through someone else
 153          * causing a vhangup by logging in.
 154          */
 155 #define FIVEMIN (5 * MINUTE)
 156         if (secs >= FIVEMIN) {
 157                 sleep(secs - FIVEMIN);
 158                 if (puts("\07\07You have to leave in 5 minutes.\n") == EOF)
 159                         exit(0);
 160                 secs = FIVEMIN;
 161         }
 162
 163 #define ONEMIN  (MINUTE)
 164         if (secs >= ONEMIN) {
 165                 sleep(secs - ONEMIN);
 166                 if (puts("\07\07Just one more minute!\n") == EOF)
 167                         exit(0);
 168         }
 169
 170         for (bother = 10; bother--;) {
 171                 sleep((u_int)ONEMIN);
 172                 if (puts("\07\07Time to leave!\n") == EOF)
 173                         exit(0);
 174         }
 175
 176         (void)puts("\07\07That was the last time I'll tell you.  Bye.\n");
 177         exit(0);
 178 }
 179
 180 static void
 181 usage(void)
 182 {
 183         (void)fprintf(stderr, "usage: %s [[+]hhmm]\n", getprogname());
 184         exit(1);
 185 }