misc_cmds/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
  34 #ifndef lint
  35 static const char copyright[] =
  36 "@(#) Copyright (c) 1980, 1988, 1993\n\
  37         The Regents of the University of California.  All rights reserved.\n";
  38 #endif /* not lint */
  39
  40 #ifndef lint
  41 #if 0
  42 static char sccsid[] = "@(#)leave.c     8.1 (Berkeley) 6/6/93";
  43 #endif
  44 #endif /* not lint */
  45 #include <sys/cdefs.h>
  46 __FBSDID("$FreeBSD: src/usr.bin/leave/leave.c,v 1.12 2002/09/04 23:29:03 dwmalone Exp $");
  47
  48 #include <sys/types.h>
  49 #include <err.h>
  50 #include <ctype.h>
  51 #include <locale.h>
  52 #include <stdio.h>
  53 #include <stdlib.h>
  54 #include <time.h>
  55 #include <unistd.h>
  56
  57 void doalarm(u_int);
  58 static void usage(void);
  59
  60 /*
  61  * leave [[+]hhmm]
  62  *
  63  * Reminds you when you have to leave.
  64  * Leave prompts for input and goes away if you hit return.
  65  * It nags you like a mother hen.
  66  */
  67 int
  68 main(int argc, char **argv)
  69 {
  70         u_int secs;
  71         int hours, minutes;
  72         char c, *cp = NULL;
  73         struct tm *t;
  74         time_t now;
  75         int plusnow, t_12_hour;
  76         char buf[50];
  77
  78         if (setlocale(LC_TIME, "") == NULL)
  79                 warn("setlocale");
  80
  81         if (argc < 2) {
  82 #define MSG1    "When do you have to leave? "
  83                 (void)write(STDOUT_FILENO, MSG1, sizeof(MSG1) - 1);
  84                 cp = fgets(buf, sizeof(buf), stdin);
  85                 if (cp == NULL || *cp == '\n')
  86                         exit(0);
  87         } else if (argc > 2)
  88                 usage();
  89         else
  90                 cp = argv[1];
  91
  92         if (*cp == '+') {
  93                 plusnow = 1;
  94                 ++cp;
  95         } else
  96                 plusnow = 0;
  97
  98         for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
  99                 if (!isdigit(c))
 100                         usage();
 101                 hours = hours * 10 + (c - '0');
 102         }
 103         minutes = hours % 100;
 104         hours /= 100;
 105
 106         if (minutes < 0 || minutes > 59)
 107                 usage();
 108         if (plusnow)
 109                 secs = hours * 60 * 60 + minutes * 60;
 110         else {
 111                 (void)time(&now);
 112                 t = localtime(&now);
 113
 114                 if (hours > 23)
 115                         usage();
 116
 117                 /* Convert tol to 12 hr time (0:00...11:59) */
 118                 if (hours > 11)
 119                         hours -= 12;
 120
 121                 /* Convert tm to 12 hr time (0:00...11:59) */
 122                 if (t->tm_hour > 11)
 123                         t_12_hour = t->tm_hour - 12;
 124                 else
 125                         t_12_hour = t->tm_hour;
 126
 127                 if (hours < t_12_hour ||
 128                    (hours == t_12_hour && minutes <= t->tm_min))
 129                         /* Leave time is in the past so we add 12 hrs */
 130                         hours += 12;
 131
 132                 secs = (hours - t_12_hour) * 60 * 60;
 133                 secs += (minutes - t->tm_min) * 60;
 134                 secs -= now % 60;       /* truncate (now + secs) to min */
 135         }
 136         doalarm(secs);
 137         exit(0);
 138 }
 139
 140 void
 141 doalarm(u_int secs)
 142 {
 143         int bother;
 144         time_t daytime;
 145         char tb[80];
 146         int pid;
 147
 148         if ((pid = fork())) {
 149                 (void)time(&daytime);
 150                 daytime += secs;
 151                 strftime(tb, sizeof(tb), "%+", localtime(&daytime));
 152                 printf("Alarm set for %s. (pid %d)\n", tb, pid);
 153                 exit(0);
 154         }
 155         sleep((u_int)2);                /* let parent print set message */
 156         if (secs >= 2)
 157                 secs -= 2;
 158
 159         /*
 160          * if write fails, we've lost the terminal through someone else
 161          * causing a vhangup by logging in.
 162          */
 163 #define FIVEMIN (5 * 60)
 164 #define MSG2    "\07\07You have to leave in 5 minutes.\n"
 165         if (secs >= FIVEMIN) {
 166                 sleep(secs - FIVEMIN);
 167                 if (write(STDOUT_FILENO, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
 168                         exit(0);
 169                 secs = FIVEMIN;
 170         }
 171
 172 #define ONEMIN  (60)
 173 #define MSG3    "\07\07Just one more minute!\n"
 174         if (secs >= ONEMIN) {
 175                 sleep(secs - ONEMIN);
 176                 if (write(STDOUT_FILENO, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
 177                         exit(0);
 178         }
 179
 180 #define MSG4    "\07\07Time to leave!\n"
 181         for (bother = 10; bother--;) {
 182                 sleep((u_int)ONEMIN);
 183                 if (write(STDOUT_FILENO, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
 184                         exit(0);
 185         }
 186
 187 #define MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
 188         (void)write(STDOUT_FILENO, MSG5, sizeof(MSG5) - 1);
 189         exit(0);
 190 }
 191
 192 static void
 193 usage(void)
 194 {
 195         fprintf(stderr, "usage: leave [[+]hhmm]\n");
 196         exit(1);
 197 }