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Annotation of 43BSDReno/usr.bin/leave/leave.c, revision 1.1

1.1     ! root        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 are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: char copyright[] =
        !            22: "@(#) Copyright (c) 1980, 1988 Regents of the University of California.\n\
        !            23:  All rights reserved.\n";
        !            24: #endif /* not lint */
        !            25: 
        !            26: #ifndef lint
        !            27: static char sccsid[] = "@(#)leave.c    5.5 (Berkeley) 6/1/90";
        !            28: #endif /* not lint */
        !            29: 
        !            30: #include <sys/param.h>
        !            31: #include <sys/time.h>
        !            32: #include <stdio.h>
        !            33: #include <ctype.h>
        !            34: 
        !            35: /*
        !            36:  * leave [[+]hhmm]
        !            37:  *
        !            38:  * Reminds you when you have to leave.
        !            39:  * Leave prompts for input and goes away if you hit return.
        !            40:  * It nags you like a mother hen.
        !            41:  */
        !            42: main(argc, argv)
        !            43:        int argc;
        !            44:        char **argv;
        !            45: {
        !            46:        register u_int secs;
        !            47:        register int hours, minutes;
        !            48:        register char c, *cp;
        !            49:        struct tm *t, *localtime();
        !            50:        time_t now, time();
        !            51:        int plusnow;
        !            52:        char buf[50];
        !            53: 
        !            54:        if (argc < 2) {
        !            55: #define        MSG1    "When do you have to leave? "
        !            56:                (void)write(1, MSG1, sizeof(MSG1) - 1);
        !            57:                cp = fgets(buf, sizeof(buf), stdin);
        !            58:                if (*cp == '\n')
        !            59:                        exit(0);
        !            60:        } else
        !            61:                cp = argv[1];
        !            62: 
        !            63:        if (*cp == '+') {
        !            64:                plusnow = 1;
        !            65:                ++cp;
        !            66:        } else {
        !            67:                plusnow = 0;
        !            68:                (void)time(&now);
        !            69:                t = localtime(&now);
        !            70:        }
        !            71: 
        !            72:        for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
        !            73:                if (!isdigit(c))
        !            74:                        usage();
        !            75:                hours = hours * 10 + (c - '0');
        !            76:        }
        !            77:        minutes = hours % 100;
        !            78:        hours /= 100;
        !            79: 
        !            80:        if (minutes < 0 || minutes > 59)
        !            81:                usage();
        !            82:        if (plusnow)
        !            83:                secs = hours * 60 * 60 + minutes * 60;
        !            84:        else {
        !            85:                if (hours > 23 || t->tm_hour > hours ||
        !            86:                    t->tm_hour == hours && minutes <= t->tm_min)
        !            87:                        usage();
        !            88:                secs = (hours - t->tm_hour) * 60 * 60;
        !            89:                secs += (minutes - t->tm_min) * 60;
        !            90:        }
        !            91:        doalarm(secs);
        !            92:        exit(0);
        !            93: }
        !            94: 
        !            95: static
        !            96: doalarm(secs)
        !            97:        u_int secs;
        !            98: {
        !            99:        register int bother;
        !           100:        time_t daytime, time();
        !           101:        int pid;
        !           102:        char *ctime();
        !           103: 
        !           104:        if (pid = fork()) {
        !           105:                (void)time(&daytime);
        !           106:                daytime += secs;
        !           107:                printf("Alarm set for %.16s. (pid %d)\n",
        !           108:                    ctime(&daytime), pid);
        !           109:                exit(0);
        !           110:        }
        !           111:        sleep((u_int)2);                /* let parent print set message */
        !           112: 
        !           113:        /*
        !           114:         * if write fails, we've lost the terminal through someone else
        !           115:         * causing a vhangup by logging in.
        !           116:         */
        !           117: #define        FIVEMIN (5 * 60)
        !           118: #define        MSG2    "\07\07You have to leave in 5 minutes.\n"
        !           119:        if (secs >= FIVEMIN) {
        !           120:                sleep(secs - FIVEMIN);
        !           121:                if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
        !           122:                        exit(0);
        !           123:                secs = FIVEMIN;
        !           124:        }
        !           125: 
        !           126: #define        ONEMIN  (60)
        !           127: #define        MSG3    "\07\07Just one more minute!\n"
        !           128:        if (secs >= ONEMIN) {
        !           129:                sleep(secs - ONEMIN);
        !           130:                if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
        !           131:                        exit(0);
        !           132:        }
        !           133: 
        !           134: #define        MSG4    "\07\07Time to leave!\n"
        !           135:        for (bother = 10; bother--;) {
        !           136:                sleep((u_int)ONEMIN);
        !           137:                if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
        !           138:                        exit(0);
        !           139:        }
        !           140: 
        !           141: #define        MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
        !           142:        (void)write(1, MSG5, sizeof(MSG5) - 1);
        !           143:        exit(0);
        !           144: }
        !           145: 
        !           146: static
        !           147: usage()
        !           148: {
        !           149:        fprintf(stderr, "usage: leave [[+]hhmm]\n");
        !           150:        exit(1);
        !           151: }

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