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. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#) Copyright (c) 1980, 1988, 1993 The Regents of the University of California.  All rights reserved.
  30  * @(#)leave.c  8.1 (Berkeley) 6/6/93
  31  * $FreeBSD: src/usr.bin/leave/leave.c,v 1.5.2.2 2001/07/30 09:43:30 dd Exp $
  32  * $DragonFly: src/usr.bin/leave/leave.c,v 1.7 2006/08/14 07:37:38 swildner Exp $
  33  */
  34
  35 #include <err.h>
  36 #include <ctype.h>
  37 #include <langinfo.h>
  38 #include <locale.h>
  39 #include <stdio.h>
  40 #include <stdlib.h>
  41 #include <time.h>
  42 #include <unistd.h>
  43
  44 void doalarm(u_int);
  45 static void usage(void);
  46
  47 /*
  48  * leave [[+]hhmm]
  49  *
  50  * Reminds you when you have to leave.
  51  * Leave prompts for input and goes away if you hit return.
  52  * It nags you like a mother hen.
  53  */
  54 int
  55 main(int argc, char **argv)
  56 {
  57         u_int secs;
  58         int hours, minutes;
  59         char c, *cp = NULL;
  60         struct tm *t;
  61         time_t now;
  62         int plusnow, t_12_hour;
  63         char buf[50];
  64
  65         if (setlocale(LC_TIME, "") == NULL)
  66                 warn("setlocale");
  67
  68         if (argc < 2) {
  69 #define MSG1    "When do you have to leave? "
  70                 (void)write(1, MSG1, sizeof(MSG1) - 1);
  71                 cp = fgets(buf, sizeof(buf), stdin);
  72                 if (cp == NULL || *cp == '\n')
  73                         exit(0);
  74         } else if (argc > 2)
  75                 usage();
  76         else
  77                 cp = argv[1];
  78
  79         if (*cp == '+') {
  80                 plusnow = 1;
  81                 ++cp;
  82         } else
  83                 plusnow = 0;
  84
  85         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
  86                 if (!isdigit(c))
  87                         usage();
  88                 hours = hours * 10 + (c - '0');
  89         }
  90         minutes = hours % 100;
  91         hours /= 100;
  92
  93         if (minutes < 0 || minutes > 59)
  94                 usage();
  95         if (plusnow)
  96                 secs = hours * 60 * 60 + minutes * 60;
  97         else {
  98                 (void)time(&now);
  99                 t = localtime(&now);
 100
 101                 if (hours > 23)
 102                         usage();
 103
 104                 /* Convert tol to 12 hr time (0:00...11:59) */
 105                 if (hours > 11)
 106                         hours -= 12;
 107
 108                 /* Convert tm to 12 hr time (0:00...11:59) */
 109                 if (t->tm_hour > 11)
 110                         t_12_hour = t->tm_hour - 12;
 111                 else
 112                         t_12_hour = t->tm_hour;
 113
 114                 if (hours < t_12_hour ||
 115                    (hours == t_12_hour && minutes <= t->tm_min))
 116                         /* Leave time is in the past so we add 12 hrs */
 117                         hours += 12;
 118
 119                 secs = (hours - t_12_hour) * 60 * 60;
 120                 secs += (minutes - t->tm_min) * 60;
 121                 secs -= now % 60;       /* truncate (now + secs) to min */
 122         }
 123         doalarm(secs);
 124         exit(0);
 125 }
 126
 127 void
 128 doalarm(u_int secs)
 129 {
 130         int bother;
 131         time_t daytime;
 132         char tb[80];
 133         int pid;
 134
 135         if ((pid = fork())) {
 136                 (void)time(&daytime);
 137                 daytime += secs;
 138                 strftime(tb, sizeof(tb), nl_langinfo(D_T_FMT),
 139                     localtime(&daytime));
 140                 printf("Alarm set for %s. (pid %d)\n", tb, pid);
 141                 exit(0);
 142         }
 143         sleep((u_int)2);                /* let parent print set message */
 144         if (secs >= 2)
 145                 secs -= 2;
 146
 147         /*
 148          * if write fails, we've lost the terminal through someone else
 149          * causing a vhangup by logging in.
 150          */
 151 #define FIVEMIN (5 * 60)
 152 #define MSG2    "\07\07You have to leave in 5 minutes.\n"
 153         if (secs >= FIVEMIN) {
 154                 sleep(secs - FIVEMIN);
 155                 if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
 156                         exit(0);
 157                 secs = FIVEMIN;
 158         }
 159
 160 #define ONEMIN  (60)
 161 #define MSG3    "\07\07Just one more minute!\n"
 162         if (secs >= ONEMIN) {
 163                 sleep(secs - ONEMIN);
 164                 if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
 165                         exit(0);
 166         }
 167
 168 #define MSG4    "\07\07Time to leave!\n"
 169         for (bother = 10; bother--;) {
 170                 sleep((u_int)ONEMIN);
 171                 if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
 172                         exit(0);
 173         }
 174
 175 #define MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
 176         (void)write(1, MSG5, sizeof(MSG5) - 1);
 177         exit(0);
 178 }
 179
 180 static void
 181 usage(void)
 182 {
 183         fprintf(stderr, "usage: leave [[+]hhmm]\n");
 184         exit(1);
 185 }