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      1 /*	$NetBSD: leave.c,v 1.15 2011/09/16 15:39:27 joerg Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 1980, 1988, 1993
      5  *	The Regents of the University of California.  All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  * 3. Neither the name of the University nor the names of its contributors
     16  *    may be used to endorse or promote products derived from this software
     17  *    without specific prior written permission.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     29  * SUCH DAMAGE.
     30  */
     31 
     32 #include <sys/cdefs.h>
     33 #ifndef lint
     34 __COPYRIGHT("@(#) Copyright (c) 1980, 1988, 1993\
     35  The Regents of the University of California.  All rights reserved.");
     36 #endif /* not lint */
     37 
     38 #ifndef lint
     39 #if 0
     40 static char sccsid[] = "@(#)leave.c	8.1 (Berkeley) 6/6/93";
     41 #else
     42 __RCSID("$NetBSD: leave.c,v 1.15 2011/09/16 15:39:27 joerg Exp $");
     43 #endif
     44 #endif /* not lint */
     45 
     46 #include <sys/param.h>
     47 #include <sys/time.h>
     48 #include <ctype.h>
     49 #include <stdio.h>
     50 #include <stdlib.h>
     51 #include <time.h>
     52 #include <err.h>
     53 #include <unistd.h>
     54 
     55 #define	SECOND	1
     56 #define MINUTE	(SECOND * 60)
     57 #define	HOUR	(MINUTE * 60)
     58 
     59 /*
     60  * leave [[+]hhmm]
     61  *
     62  * Reminds you when you have to leave.
     63  * Leave prompts for input and goes away if you hit return.
     64  * It nags you like a mother hen.
     65  */
     66 
     67 __dead static void doalarm(u_int);
     68 __dead static void usage(void);
     69 
     70 int
     71 main(int argc, char **argv)
     72 {
     73 	u_int secs;
     74 	int hours, minutes;
     75 	char c, *cp;
     76 	struct tm *t = NULL;
     77 	time_t now;
     78 	int plusnow;
     79 	char buf[50];
     80 
     81 	if (setvbuf(stdout, NULL, _IONBF, 0) != 0)
     82 		errx(1, "Cannot set stdout to unbuffered.");
     83 
     84 	if (argc < 2) {
     85 		(void)puts("When do you have to leave? ");
     86 		cp = fgets(buf, sizeof(buf), stdin);
     87 		if (cp == NULL || *cp == '\n')
     88 			exit(0);
     89 	} else
     90 		cp = argv[1];
     91 
     92 	if (*cp == '+') {
     93 		plusnow = 1;
     94 		++cp;
     95 	} else {
     96 		plusnow = 0;
     97 		(void)time(&now);
     98 		t = localtime(&now);
     99 	}
    100 
    101 	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
    102 		if (!isdigit((unsigned char)c))
    103 			usage();
    104 		hours = hours * 10 + (c - '0');
    105 	}
    106 	minutes = hours % 100;
    107 	hours /= 100;
    108 
    109 	if (minutes < 0 || minutes > 59)
    110 		usage();
    111 	if (plusnow)
    112 		secs = (hours * HOUR) + (minutes * MINUTE);
    113 	else {
    114 		if (hours > 23)
    115 			usage();
    116 		if (t->tm_hour >= 12)
    117 			t->tm_hour -= 12;
    118 		if (hours >= 12)
    119 			hours -= 12;
    120 		if (t->tm_hour > hours ||
    121 		    (t->tm_hour == hours && minutes <= t->tm_min))
    122 			hours += 12;
    123 		secs = (hours - t->tm_hour) * HOUR;
    124 		secs += (minutes - t->tm_min) * MINUTE;
    125 	}
    126 	doalarm(secs);
    127 	exit(0);
    128 }
    129 
    130 static void
    131 doalarm(u_int secs)
    132 {
    133 	int bother;
    134 	time_t daytime;
    135 
    136 	switch (fork()) {
    137 	case 0:
    138 		break;
    139 	case -1:
    140 		err(1, "Fork failed");
    141 		/*NOTREACHED*/
    142 	default:
    143 		exit(0);
    144 	}
    145 
    146 	(void)time(&daytime);
    147 	daytime += secs;
    148 	printf("Alarm set for %.16s. (pid %u)\n",
    149 	    ctime(&daytime), (unsigned)getpid());
    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 * MINUTE)
    156 	if (secs >= FIVEMIN) {
    157 		sleep(secs - FIVEMIN);
    158 		if (puts("\07\07You have to leave in 5 minutes.\n") == EOF)
    159 			exit(0);
    160 		secs = FIVEMIN;
    161 	}
    162 
    163 #define	ONEMIN	(MINUTE)
    164 	if (secs >= ONEMIN) {
    165 		sleep(secs - ONEMIN);
    166 		if (puts("\07\07Just one more minute!\n") == EOF)
    167 			exit(0);
    168 	}
    169 
    170 	for (bother = 10; bother--;) {
    171 		sleep((u_int)ONEMIN);
    172 		if (puts("\07\07Time to leave!\n") == EOF)
    173 			exit(0);
    174 	}
    175 
    176 	(void)puts("\07\07That was the last time I'll tell you.  Bye.\n");
    177 	exit(0);
    178 }
    179 
    180 static void
    181 usage(void)
    182 {
    183 	(void)fprintf(stderr, "usage: %s [[+]hhmm]\n", getprogname());
    184 	exit(1);
    185 }
    186