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leave.c revision 1.1 
      1 /*
      2  * Copyright (c) 1980, 1988 Regents of the University of California.
      3  * 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 char copyright[] =
     36 "@(#) Copyright (c) 1980, 1988 Regents of the University of California.\n\
     37  All rights reserved.\n";
     38 #endif /* not lint */
     39 
     40 #ifndef lint
     41 static char sccsid[] = "@(#)leave.c	5.6 (Berkeley) 3/1/91";
     42 #endif /* not lint */
     43 
     44 #include <sys/param.h>
     45 #include <sys/time.h>
     46 #include <stdio.h>
     47 #include <ctype.h>
     48 
     49 /*
     50  * leave [[+]hhmm]
     51  *
     52  * Reminds you when you have to leave.
     53  * Leave prompts for input and goes away if you hit return.
     54  * It nags you like a mother hen.
     55  */
     56 main(argc, argv)
     57 	int argc;
     58 	char **argv;
     59 {
     60 	register u_int secs;
     61 	register int hours, minutes;
     62 	register char c, *cp;
     63 	struct tm *t, *localtime();
     64 	time_t now, time();
     65 	int plusnow;
     66 	char buf[50];
     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 == '\n')
     73 			exit(0);
     74 	} else
     75 		cp = argv[1];
     76 
     77 	if (*cp == '+') {
     78 		plusnow = 1;
     79 		++cp;
     80 	} else {
     81 		plusnow = 0;
     82 		(void)time(&now);
     83 		t = localtime(&now);
     84 	}
     85 
     86 	for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
     87 		if (!isdigit(c))
     88 			usage();
     89 		hours = hours * 10 + (c - '0');
     90 	}
     91 	minutes = hours % 100;
     92 	hours /= 100;
     93 
     94 	if (minutes < 0 || minutes > 59)
     95 		usage();
     96 	if (plusnow)
     97 		secs = hours * 60 * 60 + minutes * 60;
     98 	else {
     99 		if (hours > 23 || t->tm_hour > hours ||
    100 		    t->tm_hour == hours && minutes <= t->tm_min)
    101 			usage();
    102 		secs = (hours - t->tm_hour) * 60 * 60;
    103 		secs += (minutes - t->tm_min) * 60;
    104 	}
    105 	doalarm(secs);
    106 	exit(0);
    107 }
    108 
    109 doalarm(secs)
    110 	u_int secs;
    111 {
    112 	register int bother;
    113 	time_t daytime, time();
    114 	int pid;
    115 	char *ctime();
    116 
    117 	if (pid = fork()) {
    118 		(void)time(&daytime);
    119 		daytime += secs;
    120 		printf("Alarm set for %.16s. (pid %d)\n",
    121 		    ctime(&daytime), pid);
    122 		exit(0);
    123 	}
    124 	sleep((u_int)2);		/* let parent print set message */
    125 
    126 	/*
    127 	 * if write fails, we've lost the terminal through someone else
    128 	 * causing a vhangup by logging in.
    129 	 */
    130 #define	FIVEMIN	(5 * 60)
    131 #define	MSG2	"\07\07You have to leave in 5 minutes.\n"
    132 	if (secs >= FIVEMIN) {
    133 		sleep(secs - FIVEMIN);
    134 		if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
    135 			exit(0);
    136 		secs = FIVEMIN;
    137 	}
    138 
    139 #define	ONEMIN	(60)
    140 #define	MSG3	"\07\07Just one more minute!\n"
    141 	if (secs >= ONEMIN) {
    142 		sleep(secs - ONEMIN);
    143 		if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
    144 			exit(0);
    145 	}
    146 
    147 #define	MSG4	"\07\07Time to leave!\n"
    148 	for (bother = 10; bother--;) {
    149 		sleep((u_int)ONEMIN);
    150 		if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
    151 			exit(0);
    152 	}
    153 
    154 #define	MSG5	"\07\07That was the last time I'll tell you.  Bye.\n"
    155 	(void)write(1, MSG5, sizeof(MSG5) - 1);
    156 	exit(0);
    157 }
    158 
    159 usage()
    160 {
    161 	fprintf(stderr, "usage: leave [[+]hhmm]\n");
    162 	exit(1);
    163 }
    164