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  */
  33
  34 #include <err.h>
  35 #include <ctype.h>
  36 #include <langinfo.h>
  37 #include <locale.h>
  38 #include <stdio.h>
  39 #include <stdlib.h>
  40 #include <time.h>
  41 #include <unistd.h>
  42
  43 static void doalarm(u_int) __dead2;
  44 static void usage(void) __dead2;
  45
  46 /*
  47  * leave [[+]hhmm]
  48  *
  49  * Reminds you when you have to leave.
  50  * Leave prompts for input and goes away if you hit return.
  51  * It nags you like a mother hen.
  52  */
  53 int
  54 main(int argc, char **argv)
  55 {
  56         u_int secs;
  57         int hours, minutes;
  58         char c, *cp = NULL;
  59         struct tm *t;
  60         time_t now;
  61         int plusnow, t_12_hour;
  62         char buf[50];
  63
  64         if (setlocale(LC_TIME, "") == NULL)
  65                 warn("setlocale");
  66
  67         if (argc < 2) {
  68 #define MSG1    "When do you have to leave? "
  69                 (void)write(1, MSG1, sizeof(MSG1) - 1);
  70                 cp = fgets(buf, sizeof(buf), stdin);
  71                 if (cp == NULL || *cp == '\n')
  72                         exit(0);
  73         } else if (argc > 2)
  74                 usage();
  75         else
  76                 cp = argv[1];
  77
  78         if (*cp == '+') {
  79                 plusnow = 1;
  80                 ++cp;
  81         } else
  82                 plusnow = 0;
  83
  84         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
  85                 if (!isdigit(c))
  86                         usage();
  87                 hours = hours * 10 + (c - '0');
  88         }
  89         minutes = hours % 100;
  90         hours /= 100;
  91
  92         if (minutes < 0 || minutes > 59)
  93                 usage();
  94         if (plusnow)
  95                 secs = hours * 60 * 60 + minutes * 60;
  96         else {
  97                 (void)time(&now);
  98                 t = localtime(&now);
  99
 100                 if (hours > 23)
 101                         usage();
 102
 103                 /* Convert tol to 12 hr time (0:00...11:59) */
 104                 if (hours > 11)
 105                         hours -= 12;
 106
 107                 /* Convert tm to 12 hr time (0:00...11:59) */
 108                 if (t->tm_hour > 11)
 109                         t_12_hour = t->tm_hour - 12;
 110                 else
 111                         t_12_hour = t->tm_hour;
 112
 113                 if (hours < t_12_hour ||
 114                    (hours == t_12_hour && minutes <= t->tm_min))
 115                         /* Leave time is in the past so we add 12 hrs */
 116                         hours += 12;
 117
 118                 secs = (hours - t_12_hour) * 60 * 60;
 119                 secs += (minutes - t->tm_min) * 60;
 120                 secs -= now % 60;       /* truncate (now + secs) to min */
 121         }
 122         doalarm(secs);
 123         exit(0);
 124 }
 125
 126 static void
 127 doalarm(u_int secs)
 128 {
 129         int bother;
 130         time_t daytime;
 131         char tb[80];
 132         int pid;
 133
 134         if ((pid = fork())) {
 135                 (void)time(&daytime);
 136                 daytime += secs;
 137                 strftime(tb, sizeof(tb), nl_langinfo(D_T_FMT),
 138                     localtime(&daytime));
 139                 printf("Alarm set for %s. (pid %d)\n", tb, pid);
 140                 exit(0);
 141         }
 142         sleep((u_int)2);                /* let parent print set message */
 143         if (secs >= 2)
 144                 secs -= 2;
 145
 146         /*
 147          * if write fails, we've lost the terminal through someone else
 148          * causing a vhangup by logging in.
 149          */
 150 #define FIVEMIN (5 * 60)
 151 #define MSG2    "\07\07You have to leave in 5 minutes.\n"
 152         if (secs >= FIVEMIN) {
 153                 sleep(secs - FIVEMIN);
 154                 if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
 155                         exit(0);
 156                 secs = FIVEMIN;
 157         }
 158
 159 #define ONEMIN  (60)
 160 #define MSG3    "\07\07Just one more minute!\n"
 161         if (secs >= ONEMIN) {
 162                 sleep(secs - ONEMIN);
 163                 if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
 164                         exit(0);
 165         }
 166
 167 #define MSG4    "\07\07Time to leave!\n"
 168         for (bother = 10; bother--;) {
 169                 sleep((u_int)ONEMIN);
 170                 if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
 171                         exit(0);
 172         }
 173
 174 #define MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
 175         (void)write(1, MSG5, sizeof(MSG5) - 1);
 176         exit(0);
 177 }
 178
 179 static void
 180 usage(void)
 181 {
 182         fprintf(stderr, "usage: leave [[+]hhmm]\n");
 183         exit(1);
 184 }