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 1.7 2006/08/14 07:37:38 swildner Exp $
  37  */
  38
  39 #include <err.h>
  40 #include <ctype.h>
  41 #include <langinfo.h>
  42 #include <locale.h>
  43 #include <stdio.h>
  44 #include <stdlib.h>
  45 #include <time.h>
  46 #include <unistd.h>
  47
  48 void doalarm(u_int);
  49 static void usage(void);
  50
  51 /*
  52  * leave [[+]hhmm]
  53  *
  54  * Reminds you when you have to leave.
  55  * Leave prompts for input and goes away if you hit return.
  56  * It nags you like a mother hen.
  57  */
  58 int
  59 main(int argc, char **argv)
  60 {
  61         u_int secs;
  62         int hours, minutes;
  63         char c, *cp = NULL;
  64         struct tm *t;
  65         time_t now;
  66         int plusnow, t_12_hour;
  67         char buf[50];
  68
  69         if (setlocale(LC_TIME, "") == NULL)
  70                 warn("setlocale");
  71
  72         if (argc < 2) {
  73 #define MSG1    "When do you have to leave? "
  74                 (void)write(1, MSG1, sizeof(MSG1) - 1);
  75                 cp = fgets(buf, sizeof(buf), stdin);
  76                 if (cp == NULL || *cp == '\n')
  77                         exit(0);
  78         } else if (argc > 2)
  79                 usage();
  80         else
  81                 cp = argv[1];
  82
  83         if (*cp == '+') {
  84                 plusnow = 1;
  85                 ++cp;
  86         } else
  87                 plusnow = 0;
  88
  89         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
  90                 if (!isdigit(c))
  91                         usage();
  92                 hours = hours * 10 + (c - '0');
  93         }
  94         minutes = hours % 100;
  95         hours /= 100;
  96
  97         if (minutes < 0 || minutes > 59)
  98                 usage();
  99         if (plusnow)
 100                 secs = hours * 60 * 60 + minutes * 60;
 101         else {
 102                 (void)time(&now);
 103                 t = localtime(&now);
 104
 105                 if (hours > 23)
 106                         usage();
 107
 108                 /* Convert tol to 12 hr time (0:00...11:59) */
 109                 if (hours > 11)
 110                         hours -= 12;
 111
 112                 /* Convert tm to 12 hr time (0:00...11:59) */
 113                 if (t->tm_hour > 11)
 114                         t_12_hour = t->tm_hour - 12;
 115                 else
 116                         t_12_hour = t->tm_hour;
 117
 118                 if (hours < t_12_hour ||
 119                    (hours == t_12_hour && minutes <= t->tm_min))
 120                         /* Leave time is in the past so we add 12 hrs */
 121                         hours += 12;
 122
 123                 secs = (hours - t_12_hour) * 60 * 60;
 124                 secs += (minutes - t->tm_min) * 60;
 125                 secs -= now % 60;       /* truncate (now + secs) to min */
 126         }
 127         doalarm(secs);
 128         exit(0);
 129 }
 130
 131 void
 132 doalarm(u_int secs)
 133 {
 134         int bother;
 135         time_t daytime;
 136         char tb[80];
 137         int pid;
 138
 139         if ((pid = fork())) {
 140                 (void)time(&daytime);
 141                 daytime += secs;
 142                 strftime(tb, sizeof(tb), nl_langinfo(D_T_FMT),
 143                     localtime(&daytime));
 144                 printf("Alarm set for %s. (pid %d)\n", tb, pid);
 145                 exit(0);
 146         }
 147         sleep((u_int)2);                /* let parent print set message */
 148         if (secs >= 2)
 149                 secs -= 2;
 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 * 60)
 156 #define MSG2    "\07\07You have to leave in 5 minutes.\n"
 157         if (secs >= FIVEMIN) {
 158                 sleep(secs - FIVEMIN);
 159                 if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
 160                         exit(0);
 161                 secs = FIVEMIN;
 162         }
 163
 164 #define ONEMIN  (60)
 165 #define MSG3    "\07\07Just one more minute!\n"
 166         if (secs >= ONEMIN) {
 167                 sleep(secs - ONEMIN);
 168                 if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
 169                         exit(0);
 170         }
 171
 172 #define MSG4    "\07\07Time to leave!\n"
 173         for (bother = 10; bother--;) {
 174                 sleep((u_int)ONEMIN);
 175                 if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
 176                         exit(0);
 177         }
 178
 179 #define MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
 180         (void)write(1, MSG5, sizeof(MSG5) - 1);
 181         exit(0);
 182 }
 183
 184 static void
 185 usage(void)
 186 {
 187         fprintf(stderr, "usage: leave [[+]hhmm]\n");
 188         exit(1);
 189 }