usr.bin/leave/leave.c

   1 /*
   2  * Copyright (c) 1980, 1988, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 3. All advertising materials mentioning features or use of this software
  14  *    must display the following acknowledgement:
  15  *      This product includes software developed by the University of
  16  *      California, Berkeley and its contributors.
  17  * 4. Neither the name of the University nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  *
  33  * @(#) Copyright (c) 1980, 1988, 1993 The Regents of the University of California.  All rights reserved.
  34  * @(#)leave.c  8.1 (Berkeley) 6/6/93
  35  * $FreeBSD: src/usr.bin/leave/leave.c,v 1.5.2.2 2001/07/30 09:43:30 dd Exp $
  36  * $DragonFly: src/usr.bin/leave/leave.c,v 1.4 2005/04/10 20:55:38 drhodus Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <ctype.h>
  41 #include <locale.h>
  42 #include <stdio.h>
  43 #include <stdlib.h>
  44 #include <time.h>
  45 #include <unistd.h>
  46
  47 void doalarm(u_int);
  48 static void usage(void);
  49
  50 /*
  51  * leave [[+]hhmm]
  52  *
  53  * Reminds you when you have to leave.
  54  * Leave prompts for input and goes away if you hit return.
  55  * It nags you like a mother hen.
  56  */
  57 int
  58 main(int argc, char **argv)
  59 {
  60         u_int secs;
  61         int hours, minutes;
  62         char c, *cp = NULL;
  63         struct tm *t;
  64         time_t now;
  65         int plusnow, t_12_hour;
  66         char buf[50];
  67
  68         if (setlocale(LC_TIME, "") == NULL)
  69                 warn("setlocale");
  70
  71         if (argc < 2) {
  72 #define MSG1    "When do you have to leave? "
  73                 (void)write(1, MSG1, sizeof(MSG1) - 1);
  74                 cp = fgets(buf, sizeof(buf), stdin);
  75                 if (cp == NULL || *cp == '\n')
  76                         exit(0);
  77         } else if (argc > 2)
  78                 usage();
  79         else
  80                 cp = argv[1];
  81
  82         if (*cp == '+') {
  83                 plusnow = 1;
  84                 ++cp;
  85         } else
  86                 plusnow = 0;
  87
  88         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
  89                 if (!isdigit(c))
  90                         usage();
  91                 hours = hours * 10 + (c - '0');
  92         }
  93         minutes = hours % 100;
  94         hours /= 100;
  95
  96         if (minutes < 0 || minutes > 59)
  97                 usage();
  98         if (plusnow)
  99                 secs = hours * 60 * 60 + minutes * 60;
 100         else {
 101                 (void)time(&now);
 102                 t = localtime(&now);
 103
 104                 if (hours > 23)
 105                         usage();
 106
 107                 /* Convert tol to 12 hr time (0:00...11:59) */
 108                 if (hours > 11)
 109                         hours -= 12;
 110
 111                 /* Convert tm to 12 hr time (0:00...11:59) */
 112                 if (t->tm_hour > 11)
 113                         t_12_hour = t->tm_hour - 12;
 114                 else
 115                         t_12_hour = t->tm_hour;
 116
 117                 if (hours < t_12_hour ||
 118                    (hours == t_12_hour && minutes <= t->tm_min))
 119                         /* Leave time is in the past so we add 12 hrs */
 120                         hours += 12;
 121
 122                 secs = (hours - t_12_hour) * 60 * 60;
 123                 secs += (minutes - t->tm_min) * 60;
 124                 secs -= now % 60;       /* truncate (now + secs) to min */
 125         }
 126         doalarm(secs);
 127         exit(0);
 128 }
 129
 130 void
 131 doalarm(u_int secs)
 132 {
 133         int bother;
 134         time_t daytime;
 135         char tb[80];
 136         int pid;
 137
 138         if ((pid = fork())) {
 139                 (void)time(&daytime);
 140                 daytime += secs;
 141                 strftime(tb, sizeof(tb), "%+", localtime(&daytime));
 142                 printf("Alarm set for %s. (pid %d)\n", tb, pid);
 143                 exit(0);
 144         }
 145         sleep((u_int)2);                /* let parent print set message */
 146         if (secs >= 2)
 147                 secs -= 2;
 148
 149         /*
 150          * if write fails, we've lost the terminal through someone else
 151          * causing a vhangup by logging in.
 152          */
 153 #define FIVEMIN (5 * 60)
 154 #define MSG2    "\07\07You have to leave in 5 minutes.\n"
 155         if (secs >= FIVEMIN) {
 156                 sleep(secs - FIVEMIN);
 157                 if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
 158                         exit(0);
 159                 secs = FIVEMIN;
 160         }
 161
 162 #define ONEMIN  (60)
 163 #define MSG3    "\07\07Just one more minute!\n"
 164         if (secs >= ONEMIN) {
 165                 sleep(secs - ONEMIN);
 166                 if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
 167                         exit(0);
 168         }
 169
 170 #define MSG4    "\07\07Time to leave!\n"
 171         for (bother = 10; bother--;) {
 172                 sleep((u_int)ONEMIN);
 173                 if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
 174                         exit(0);
 175         }
 176
 177 #define MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
 178         (void)write(1, MSG5, sizeof(MSG5) - 1);
 179         exit(0);
 180 }
 181
 182 static void
 183 usage(void)
 184 {
 185         fprintf(stderr, "usage: leave [[+]hhmm]\n");
 186         exit(1);
 187 }