InfoMagic Source Code 1993 July/THE_SOURCE_CODE_CD_ROM.iso/bsd_srcs/usr.bin/leave/leave.c

C/C++ Source or Header | 1991-04-17 | 4.4 KB | 164 lines

/*
 * Copyright (c) 1980, 1988 Regents of the University of California.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. All advertising materials mentioning features or use of this software
 *    must display the following acknowledgement:
 *    This product includes software developed by the University of
 *    California, Berkeley and its contributors.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1980, 1988 Regents of the University of California.\n\
 All rights reserved.\n";
#endif /* not lint */

#ifndef lint
static char sccsid[] = "@(#)leave.c    5.6 (Berkeley) 3/1/91";
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <stdio.h>
#include <ctype.h>

/*
 * leave [[+]hhmm]
 *
 * Reminds you when you have to leave.
 * Leave prompts for input and goes away if you hit return.
 * It nags you like a mother hen.
 */
main(argc, argv)
    int argc;
    char **argv;
{
    register u_int secs;
    register int hours, minutes;
    register char c, *cp;
    struct tm *t, *localtime();
    time_t now, time();
    int plusnow;
    char buf[50];

    if (argc < 2) {
#define    MSG1    "When do you have to leave? "
        (void)write(1, MSG1, sizeof(MSG1) - 1);
        cp = fgets(buf, sizeof(buf), stdin);
        if (*cp == '\n')
            exit(0);
    } else
        cp = argv[1];

    if (*cp == '+') {
        plusnow = 1;
        ++cp;
    } else {
        plusnow = 0;
        (void)time(&now);
        t = localtime(&now);
    }

    for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
        if (!isdigit(c))
            usage();
        hours = hours * 10 + (c - '0');
    }
    minutes = hours % 100;
    hours /= 100;

    if (minutes < 0 || minutes > 59)
        usage();
    if (plusnow)
        secs = hours * 60 * 60 + minutes * 60;
    else {
        if (hours > 23 || t->tm_hour > hours ||
            t->tm_hour == hours && minutes <= t->tm_min)
            usage();
        secs = (hours - t->tm_hour) * 60 * 60;
        secs += (minutes - t->tm_min) * 60;
    }
    doalarm(secs);
    exit(0);
}

doalarm(secs)
    u_int secs;
{
    register int bother;
    time_t daytime, time();
    int pid;
    char *ctime();

    if (pid = fork()) {
        (void)time(&daytime);
        daytime += secs;
        printf("Alarm set for %.16s. (pid %d)\n",
            ctime(&daytime), pid);
        exit(0);
    }
    sleep((u_int)2);        /* let parent print set message */

    /*
     * if write fails, we've lost the terminal through someone else
     * causing a vhangup by logging in.
     */
#define    FIVEMIN    (5 * 60)
#define    MSG2    "\07\07You have to leave in 5 minutes.\n"
    if (secs >= FIVEMIN) {
        sleep(secs - FIVEMIN);
        if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
            exit(0);
        secs = FIVEMIN;
    }

#define    ONEMIN    (60)
#define    MSG3    "\07\07Just one more minute!\n"
    if (secs >= ONEMIN) {
        sleep(secs - ONEMIN);
        if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
            exit(0);
    }

#define    MSG4    "\07\07Time to leave!\n"
    for (bother = 10; bother--;) {
        sleep((u_int)ONEMIN);
        if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
            exit(0);
    }

#define    MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
    (void)write(1, MSG5, sizeof(MSG5) - 1);
    exit(0);
}

usage()
{
    fprintf(stderr, "usage: leave [[+]hhmm]\n");
    exit(1);
}