Source Code 1992 March/Source_Code_CD-ROM_Walnut_Creek_March_1992.iso/usenet/compsrcs/misc/volume10/weekday

Internet Message Format | 1991-08-27 | 29.9 KB

From decwrl!ogicse!uwm.edu!cs.utexas.edu!uunet!allbery Sat Mar  3 18:29:02 PST 1990
Article 1356 of comp.sources.misc:
Path: decwrl!ogicse!uwm.edu!cs.utexas.edu!uunet!allbery
From: [e-mail] (Marcel Mol)
Newsgroups: comp.sources.misc
Subject: v10i084: new version of weekday
Message-ID: <[e-mail]>
Date: 27 Feb 90 02:54:57 GMT
Sender: [e-mail]
Organization: Delft University of Technology, Dep. of Electrotechnical engineering.
Lines: 755
Approved: [e-mail] (Brandon S. Allbery - comp.sources.misc)
Posted: Mon Feb 26 18:54:57 1990

Posting-number: Volume 10, Issue 84
Submitted-by: [e-mail] (Marcel Mol)
Archive-name: weekday

[Shar, please!!!  ++bsa]

This version of weekday repairs some bugs and adds the ISO date standard as
date input format. (The diffs were almost as large as the source so I send out
the soure).

-Marcel

------------------------- Cut here ---------------------------------------
#! /bin/sh
# This file was wrapped with "dummyshar".  "sh" this file to extract.
# Contents:  weekday.c
echo extracting 'weekday.c'
if test -f 'weekday.c' -a -z "$1"; then echo Not overwriting 'weekday.c'; else
sed 's/^X//' << \EOF > 'weekday.c'
X/* @(#) weekday.c       3.40 02/06/90  */
X/*************************************************************************
X **                                                                     **
X **  Name    :  weekday                                                 **
X **  Author  :  Marcel J.E. Mol                                         **
X **  Date    :  12/28/89              (first release)                   **
X **  Version :  3.40                                                    **
X **  Files   :  weekday.c       Main source file                        **
X **                                                                     **
X **  ------------------------- Revision List -------------------------  **
X **  Ver   Date       Name                   Remarks                    **
X **  3.40  02/06/90   Marcel Mol    Added ISO date standard YYYY-MM-DD  **
X **                              Suggested by mathew [e-mail] **
X **  3.33  02/04/90   Marcel Mol    Fixed bug when entering years in    **
X **                                 0 <= year <= 99 with leading '0'    **
X **  3.32  02/01/90   Marcel Mol    Fixed typos in January February     **
X **                                 October                             **
X **  3.31  01/09/90   Marcel Mol    Removed unnecessary code.           **
X **                                 Added comments.                     **
X **  3.30  01/08/90   Marcel Mol    Improved option handling.           **
X **                                 verbose works on more options.      **
X **                                 use printf field length option to   **
X **                                 get short day and month names.      **
X **  3.26  01/07/90   Marcel Mol    Filled in usage function.           **
X **  3.25  01/04/90   Marcel Mol    Use 'today' when no date is given.  **
X **  3.20  01/03/90   Marcel Mol    Allow bsd `date` as input.          **
X **  3.11  01/03/90   Marcel Mol    Documentation, typos, checkdate().  **
X **                                 Removed redundant checks.           **
X **  3.10  01/02/90   Marcel Mol    Added -s and -v options.            **
X **                                 allow yy.ddd input and implement    **
X **                                 julian date conversion.             **
X **  3.00  12/30/89   Marcel Mol    Set up user interface.              **
X **                                 Allow mm/dd/yy and dd-mm-yy input.  **
X **                                 Options to print different parts.   **
X **  2.10  12/28/89   Marcel Mol    Added Julianday.                    **
X **  2.00  12/27/89   Marcel Mol    Made weekday and weeknr everlasting.**
X **  1.00  12/26/89   Marcel Mol    First release.                      **
X **                                 Set up algorithms weekday weeknr.   **
X **  =================================================================  **
X **                                                                     **
X **  Compile as follows: cc weekday.c -Oso weekday                      **
X **                                                                     **
X **  Usage: weekday [-svdDmMywjnah] [<date>]                            **
X **                                                                     **
X **         Weekday outputs line on which it informs you about several  **
X **         thing of the given <date>.                                  **
X **         The <date> input may be in several formats:                 **
X **                                                                     **
X **             mm/dd/yy      e.g.   10/30/89    or 1/2/510             **
X **             dd-mm-yy      e.g.   30-10-89    or 2-1-510             **
X **             yyyy-mm-dd    e.g. 1989-10-30    or 0510-1-2            **
X **             yy.ddd        e.g.   89.303      or 510.2               **
X **             `date` output e.g.   Mon Oct 30 99:99:99 1989           **
X **                                                                     **
X **         If no date argument is given, weekday uses the system date. **
X **         The yyyy-mm-dd date format must have 4 digits for the yyyy  **
X **         part, 2 for the mm part and 2 for the dd part; it's just    **
X **         the ISO date standard. (undocumented feature: it also works **
X **         if the mm and/or dd part is only one digit long.)           **
X **         So the following trick does not apply to this date format:  **
X **         When the year number is less than 100 and the string        **
X **         forming the year does not start with a 0, the year is       **
X **         converted to be in the current century. So 10/30/89 is      **
X **         actually 10/30/1989. If the real year 89 is wanted specify  **
X **         it as 10/30/089. (the current century is a constant in the  **
X **         source code. If this programs survives 1999 this constant   **
X **         must be changed, and the program recompiled.)               **
X **         Note: make sure that `date` output is passed as one         **
X **         argument, so enclose it with "s.                            **
X **                                                                     **
X **         The output, when no options are given, is something like    **
X **         this:                                                       **
X **                                                                     **
X **         30 October 1989 is on a Monday on julian day 303 in week 44 **
X **                                                                     **
X **         or:                                                         **
X **                                                                     **
X **         2 January 510 is on a Friday on julian day 2 in week 1      **
X **                                                                     **
X **         Depending on the options the output changes:                **
X **                                                                     **
X **           -s toggle short form output: Monday -> Mon, June -> Jun   **
X **              and vice versa.                                        **
X **           -v toggle verbose output; removes 'is on a' etc.          **
X **              and vice versa.                                        **
X **           -d prints day of week number: 1 is Monday, 7 is Sunday    **
X **           -D gives day of week name, i.e Monday or Mon              **
X **           -m prints the month number                                **
X **           -M outputs the month name, i.e. January or Jan            **
X **           -y outputs the year number                                **
X **           -w gives the week number                                  **
X **           -j outputs the julian day number                          **
X **           -n gives day of month                                     **
X **           -a gives everything it knows. Without the -s and -v       **
X **              options this outputs the same as the default case.     **
X **              In fact -a is just short for -nmyDjw.                  **
X **           -h give a usage message                                   **
X **                                                                     **
X **         With the verbose option on, each printing option speaks to  **
X **         you in a more or less english way.                          **
X **         All options that print something also print a space         **
X **         character (except -a).                                      **
X **         The options may come in any order and as many times as      **
X **         you like. The -s and -v options only have an effect on the  **
X **         options that follow them.                                   **
X **         When now option is given (except for the -v and -s option)  **
X **         the -a option is default.                                   **
X **         The output is ended with a newline                          **
X **         Examples:                                                   **
X **                                                                     **
X **           % weekday  -yjMdD 12/31/89                                **
X **           89 365 December 7 Sunday                                  **
X **                                                                     **
X **           % weekday  -yjMsdD 12/31/89                               **
X **           89 365 December 7 Sun                                     **
X **                                                                     **
X **           % weekday  -yjsMsdD 12/31/89                              **
X **           89 365 Dec 7 Sunday                                       **
X **                                                                     **
X **           % weekday  -v 30/30/89                                    **
X **           30 Oct 1989 is on a Mon on julian day 303 in week 44      **
X **                                                                     **
X **   BUGS: the program assumes there have always been leap years       **
X **         so year 4 is a leap year as far as the program can tell...  **
X **                                                                     **
X **   This software is copyrighted (c) 1989 1990 by M.J.E. Mol.         **
X **   This code or part of this code may be used by freeware,           **
X **   public domain or any other non-commercial product. I only ask     **
X **   you to give me credit for the used code in the documentation      **
X **   and in your source code.                                          **
X **                                                                     **
X **   If you want to use this code or part of this code in your         **
X **   shareware or any other commercial product, I ask you to contact   **
X **   me so we can setup an arrangement for the use of the code or part **
X **   of the code.                                                      **
X **                                                                     **
X **   In any case, I can not be held responsible for any damage this    **
X **   code or part of this code may cause you or anyone or anything     **
X **   else.                                                             **
X **                                                                     **
X **   Mail bugs to: email: [e-mail]                     **
X **                 pmail: Marcel J.E. Mol                              **
X **                        Karel Doormanlaan 58                         **
X **                        2283AT Rijswijk                              **
X **                        The Netherlands (Holland)                    **
X **                 Phone: [phone]                            **
X **                 Bankaccount: 36.89.35.922 (In the Netherlands)      **
X **                                                                     **
X ************************************************************************/
X
Xchar * copyright = "@(#) weekday.c  3.40 02/06/90  (c) M.J.E. Mol";
X
X#include <stdio.h>
X#include <string.h>
X#include <time.h>
X
X
X#define CENTURY     1900                             /* prefix for years */
X#define LEAP(year)  ((year%4 == 0) && (year%100 != 0) || (year%400 == 0))
X
X/*
X * Global variables
X */
X
Xchar *weekdays[8]   = {"", "Monday", "Tuesday", "Wednesday", "Thursday",
X                           "Friday", "Saterday", "Sunday"};
Xchar  days[13]      = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
Xint   juldays[13]   = {0, 0, 31, 59, 90, 120, 151, 181, 212, 243, 273, 304, 334};
Xchar *monthname[13] = {"", "January", "February", "March", "April",
X                           "May", "June", "July", "August",
X                           "September", "October", "November", "December"};
X
Xint shortflag = 0;                  /* short output of day and month name */
Xint verbose   = 1;                  /* output in a 'sentence' */
Xchar * progname;
X
X
X/*
X * function declarations
X */
Xvoid main();
Xvoid scanmmddyy();
Xvoid scanyyyymmdd();
Xvoid scanddmmyy();
Xint  scanjul();
Xint  scandate();
Xint  julianday();
Xvoid julian2day();
Xint  weekday();
Xint  weeknr();
Xvoid checkdate();
Xvoid usage();
X
X
Xvoid main(argc, argv)
Xint argc;
Xchar **argv;
X{
X    int year, month, day, week;
X    int wday = -1;
X    int jday = -1;
X    int opt, haveopt;
X    char *date;
X    extern int optind;                  /* For getopt */
X    extern char * optarg;               /* For getopt */
X
X    progname = *argv;
X    date = argv[argc-1];
X
X    /*
X     * pick up the date argument and scan it
X     */
X    if (*date == '-' || argc == 1)                   /* no date, take current */
X        wday = scandate(NULL, &year, &month, &day);
X    else if (strchr(date, '/') != NULL)              /* mm/dd/yy format date */
X        scanmmddyy(date, &year, &month, &day);
X    else if (strchr(date, '-') == date+4)            /* yyyy-mm-dd format    */
X        scanyyyymmdd(date, &year, &month, &day);
X    else if (strchr(date, '-') != NULL)              /* dd-mm-yy format date */
X        scanddmmyy(date, &year, &month, &day);
X    else if (strchr(date, '.') != NULL)              /* yyyy.ddd format date */
X        jday = scanjulian(date, &year, &month, &day);
X    else                                           /* unix date output format */
X        wday = scandate(date, &year, &month, &day);
X
X    /*
X     * get missing data
X     */
X    if (jday == -1)
X        jday = julianday(year, month, day);
X    if (wday == -1)
X        wday = weekday(year, month, day);
X    week = weeknr(year, month, day);
X
X
X    /*
X     * print the wanted stuff ...
X     */
X    while ((opt = getopt(argc, argv, "svdDmMywjnah")) != EOF) {
X        switch (opt) {
X            case 's' : shortflag ^=  1;
X                       break;
X            case 'v' : verbose ^= 1;
X                       break;
X            case 'D' : printf("%s%.*s ",
X                                   verbose ? "is on a " : "",
X                                   shortflag ? 3 : 9 , weekdays[wday]);
X                       haveopt = 1;
X                       break;
X            case 'd' : printf("%s%d ", verbose ? "is weekday " : "", wday);
X                       haveopt = 1;
X                       break;
X            case 'm' : printf("%d ", month);
X                       haveopt = 1;
X                       break;
X            case 'M' : printf("%.*s ", shortflag ? 3 : 9, monthname[month]);
X                       haveopt = 1;
X                       break;
X            case 'y' : printf("%d ", year);
X                       haveopt = 1;
X                       break;
X            case 'w' : printf("%s%d ", verbose ? "in week " : "", week);
X                       haveopt = 1;
X                       break;
X            case 'j' : printf("%s%d ", verbose ? "on julian day " : "", jday);
X                       haveopt = 1;
X                       break;
X            case 'n' : printf("%d ", day);
X                       haveopt = 1;
X                       break;
X            case 'a' : if (verbose) {
X                           printf("%d %.*s %d is on a %.*s ",
X                                  day,  shortflag ? 3 : 9, monthname[month],
X                                  year, shortflag ? 3 : 9, weekdays[wday]);
X                           printf("on julian day %d in week %d", jday, week);
X                       }
X                       else
X                           printf("%d %.*s %d %.*s %d %d",
X                                  day,  shortflag ? 3 : 9, monthname[month],
X                                  year, shortflag ? 3 : 9, weekdays[wday],
X                                  jday, week);
X                       haveopt = 1;
X                       break;
X            case 'h' : usage();
X                       break;
X            default  : fprintf(stderr,
X                               "%s: use -h option for help\n", progname);
X                       exit(1);
X                       break;
X        }
X    }
X
X
X    if (!haveopt) {
X        if (verbose) {
X            printf("%d %.*s %d is on a %.*s ",
X                   day,  shortflag ? 3 : 9, monthname[month],
X                   year, shortflag ? 3 : 9, weekdays[wday]);
X            printf("on julian day %d in week %d", jday, week);
X        }
X        else
X            printf("%d %.*s %d %.*s %d %d",
X                   day,  shortflag ? 3 : 9, monthname[month],
X                   year, shortflag ? 3 : 9, weekdays[wday],
X                   jday, week);
X    }
X
X    /*
X     * finish with a newline
X     */
X    putchar('\n');
X
X    exit(0);
X
X} /* main */
X/*************************************************************************
X **                                                                     **
X **                    DATE SCANNING ROUTINES                           **
X **                                                                     **
X *************************************************************************/
X
X/*
X * scanmmddyy --- scan the date variable in the form MM/DD/YY.
X *                MM, DD and YY may be variable sized numbers.
X *                output is in output variables year, month and day.
X */
Xvoid scanmmddyy(date, year, month, day)
Xchar *date;
Xint *year, *month, *day;
X{
X    char *i;
X
X    if (sscanf(date, "%d/%d/%d", month, day, year) != 3 ||
X        *month <= 0 || *day <= 0 || *year < 0) {
X        fprintf(stderr, "%s: error in mm/dd/yy format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X
X    if (*year < 100) {
X        i = strrchr(date, '/') + 1;
X        if (*i != '0')
X           *year += CENTURY;
X    }
X
X    return;
X
X} /* scanmmddyy */
X
X
X
X/*
X * scanyyyymmdd --- scan the date variable in the form YYYY-MM-DD.
X *                YYYY, MM and DD must be 4, 2 and 2 digits wide.
X *                output is in output variables year, month and day.
X */
Xvoid scanyyyymmdd(date, year, month, day)
Xchar *date;
Xint *year, *month, *day;
X{
X
X    if (sscanf(date, "%4d-%2d-%2d", year, month, day) != 3 ||
X        *month <= 0 || *day <= 0 || *year < 0) {
X        fprintf(stderr, "%s: error in yyyy-mm-dd format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X
X    return;
X
X} /* scanyyyymmdd */
X
X
X/*
X * scanddmmyy --- scan the date variable in the form DD-MM-YY.
X *                Also YYYY-MM-DD is recognized if YYYY > 31 and DD <= 31.
X *                DD, MM and YY may be variable sized numbers.
X *                output is in output variables year, month and day.
X */
Xvoid scanddmmyy(date, year, month, day)
Xchar *date;
Xint *year, *month, *day;
X{
X    char *i;
X
X    if (sscanf(date, "%d-%d-%d", day, month, year) != 3 ||
X        *month <= 0 || *day <= 0 || *year < 0) {
X        fprintf(stderr, "%s: error in dd-mm-yy format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X
X    if (*year < 100) {
X        i = strrchr(date, '-') + 1;
X        if (*i != '0')
X           *year += CENTURY;
X    }
X
X    return;
X
X} /* scanddmmyy */
X
X
X
X/*
X * scanjulian --- scan the date variable in the form YY.DDD.
X *                YY and DDD may be variable sized numbers.
X *                output is in output variables year, month and day.
X *                the return value is tha actual julian day DDD.
X */
Xint scanjulian(date, year, month, day)
Xchar *date;
Xint *year, *month, *day;
X{
X    int jday;
X
X    if (sscanf(date, "%d.%d", year, &jday) != 2 || *year < 0 || jday <= 0) {
X        fprintf(stderr, "%s: error in julian date %s\n", progname, date);
X        exit(4);
X    }
X
X    if ((*year < 100) && (*date != '0'))
X        *year += CENTURY;
X    julian2day(*year, jday, month, day);
X
X    return jday;
X
X} /* scanjulian */
X
X
X
X/*
X * scandate --- scan the date variable in the Unix `date` form.
X *              This can look like: "Mon Jan 8 20:10:10 MET 1990"
X *              or:                 "Mon Jan 8 20:10:10 1990"
X *              the number of spaces between the fields is not fixed
X *              (although date output is always in  the same with, see ctime(3).
X *              output is in output variables year, month and day.
X *              the return value is the day of the week number.
X *              If the date input is the NULL pointer, the xurrent system date
X *              is taken.
X */
Xint scandate(date, year, month, day)
Xchar *date;
Xint *year, *month, *day;
X{
X    char *i;
X    char dayname[4];
X    char monname[10];
X    int j, k;
X    long tim;
X
X    if (date == NULL) {
X        tim = time((long *) 0);
X        date= ctime(&tim);
X    }
X
X    if (sscanf(date, "%3s %3s %d %*s %d",      /* date without time zone */
X                     dayname, monname, day, year) != 4 &&
X        sscanf(date, "%3s %3s %d %*s %*s %d", /* date with time zone */
X                     dayname, monname, day, year) != 4) {
X        fprintf(stderr, "%s: error in unix `date` format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X
X    for(j=1; j<12; j++) {
X        if (strncmp(monname, monthname[j], 3) == NULL)
X            break;
X    }
X    if (strncmp(monname, monthname[j], 3) != NULL) {
X        fprintf(stderr, "%s: error in unix `date` format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X    *month = j;
X    for(j=1; j<7; j++) {
X        if (strncmp(dayname, weekdays[j], 3) == NULL)
X            break;
X    }
X    if (strncmp(dayname, weekdays[j], 3) != NULL) {
X        fprintf(stderr, "%s: error in unix `date` format date %s\n",
X                        progname, date);
X        exit(4);
X    }
X
X    return j;
X
X} /* scandate */
X/*************************************************************************
X **                                                                     **
X **                    DATE CONVERSION ROUTINES                         **
X **                                                                     **
X *************************************************************************/
X
X
X
X/*
X * julian2day -- converts year and julian day value to the corresponding
X *               month and day of the month values for that year.
X *               these values are returned in the ouput variables month and day.
X */
Xvoid julian2day(year, jday, month, day)
Xint year, jday;
Xint *month, *day;
X{
X    int leap;
X
X    leap = LEAP(year) ? 1 : 0;
X    if (jday > 365+leap || jday <= 0) {
X        fprintf(stderr, "%s: error in julian date %d.%d\n",
X                        progname, year, jday);
X       exit(8);
X    }
X
X    if (jday <= 31) {
X        *month = 1;
X        *day = jday;
X        return;
X    }
X
X    jday -= leap;
X    if (jday <= 59) {
X        *month = 2;
X        *day = jday - 31 + leap;
X    }
X    else if (jday <= 90) {
X        *month = 3;
X        *day = jday - 59;
X    }
X    else if (jday <= 120) {
X        *month = 4;
X        *day = jday - 90;
X    }
X    else if (jday <= 151) {
X        *month = 5;
X        *day = jday - 120;
X    }
X    else if (jday <= 181) {
X        *month = 6;
X        *day = jday - 151;
X    }
X    else if (jday <= 212) {
X        *month = 7;
X        *day = jday - 181;
X    }
X    else if (jday <= 243) {
X        *month = 8;
X        *day = jday - 212;
X    }
X    else if (jday <= 273) {
X        *month = 9;
X        *day = jday - 243;
X    }
X    else if (jday <= 304) {
X        *month = 10;
X        *day = jday - 273;
X    }
X    else if (jday <= 334) {
X        *month = 11;
X        *day = jday - 304;
X    }
X    else {
X        *month = 12;
X        *day = jday - 334;
X    }
X
X    return;
X
X} /* julian2day */
X
X
X
X/*
X * julianday -- converts a year, mont and day value the corresponding julian
X *              day number of that year.
X *              the julian day is passed as a return value.
X */
Xjulianday(year, month, day)
Xint year, month, day;
X{
X    register int doy;
X
X    checkdate(year, month, day);           /* exits if date in error */
X
X    doy = juldays[month];
X    if ((month > 2) && LEAP(year))
X        doy++;
X    doy += day;
X
X    return doy;
X
X} /* julianday */
X
X
X
X/*
X * weekday -- returns the day of the week number based on the given
X *            year, month and day of the month value.
X */
Xweekday(year, month, day)
Xint year, month, day;
X{
X    register int dow;
X
X    checkdate(year, month, day);           /* exits if date in error */
X
X    dow = 6 +                             /* the magic number */
X          year +                          /* shift a day each year */
X          year/4 - year/100 + year/400 +  /* shift a day each leap year */
X          juldays[month] + day;           /* day of year */
X
X    if ((month < 3) && LEAP(year))        /* first two months of leap don't */
X        dow--;                            /* have the extra leap shift      */
X
X    dow %= 7;
X    return (dow == 0) ? 7 : dow;          /* convert 0 to 7 */
X
X} /* weekday */
X
X
X/*
X * weeknr -- returns the weeknumber of the given date (year, month and day of
X *           the month) for that year.
X */
Xweeknr(year, month, day)
Xint year, month, day;
X{
X    register int fday, jul, weeknum;
X
X    checkdate(year, month, day);           /* exits if date in error */
X
X    fday = weekday(year, 1, 1);
X
X    jul = julianday(year, month, day);
X    weeknum = (jul + fday - 2)/7;
X    if (fday <= 4)
X        weeknum++;
X
X    if (weeknum == 0)                      /* go into previous year           */
X        if ((fday == 5) ||                 /* week 1 has 4 or 5 days and week */
X           ((fday == 6) && LEAP(year-1)) ) /*    53 has 4 or 5 days in year-1 */
X            return 53;
X        else
X            return 52;
X
X    if (weeknum == 53) {                  /* only a week 53 if we have > 4   */
X        fday = weekday(year, 12, 31);     /*     days in the week            */
X        if (fday < 4)
X           weeknum = 1;
X    }
X
X    return weeknum;
X
X} /* weeknr */
X/*************************************************************************
X **                                                                     **
X **                         OTHER  ROUTINES                             **
X **                                                                     **
X *************************************************************************/
X
X
X
X/*
X * checkdate -- checks if the given date is a valid one.
X *              if not, it just exits.
X */
Xvoid checkdate(year, month, day)
Xint year, month, day;
X{
X    int dim;
X
X    if (year < 0) {
X        fprintf(stderr, "%s: %d is an invalid year\n", progname, year);
X        exit(2);
X    }
X
X    if ((month < 1) || (month > 12)) {
X        fprintf(stderr, "%s: %d is an invalid month\n", progname, month);
X        exit(2);
X    }
X
X    dim = days[month];
X    if ((month == 2) && LEAP(year))
X        dim++;
X    if ((day > dim) || (day < 1)) {
X        fprintf(stderr, "%s: %d is an invalid day in %s %d\n", progname,
X                         day, monthname[month], year);
X        exit(2);
X    }
X
X   return;
X
X} /* checkdate */
X
X
X
X/*
X * usage -- give usage message.
X */
Xvoid usage()
X{
X
X    fprintf(stderr,"Usage: weekday [-svdDmMywjnah] [<date>]\n");
X    fprintf(stderr,"   <date>: mm/dd/yy  |  dd-mm-yy  |  yyyy-mm-dd\n  |");
X    fprintf(stderr,"           yy.ddd  |  Unix date\n");
X    fprintf(stderr,"   default is today\n");
X    fprintf(stderr,"   options: -s toggle short form output\n");
X    fprintf(stderr,"            -v toggle verbose output\n");
X    fprintf(stderr,"            -d prints day of week number\n");
X    fprintf(stderr,"            -D gives day of week name\n");
X    fprintf(stderr,"            -m prints the month number\n");
X    fprintf(stderr,"            -M outputs the month name\n");
X    fprintf(stderr,"            -y outputs the year number\n");
X    fprintf(stderr,"            -w gives the week number\n");
X    fprintf(stderr,"            -j outputs the julian day number\n");
X    fprintf(stderr,"            -n gives day of month\n");
X    fprintf(stderr,"            -a gives everything it knows (default)\n");
X    fprintf(stderr,"            -h give a usage message\n");
X
X    return;
X
X} /* usage */
EOF
chars=`wc -c < 'weekday.c'`
if test $chars !=    27998; then echo 'weekday.c' is $chars characters, should be    27998 characters!; fi
fi
exit 0
--
#########################################
# Marcel J.E. Mol                       ######################################
# Delft University of Technology          Pink Elephant Management Services  #
# The Netherlands                         Voorburg                           #
# UUCP: [e-mail]          Tel: [phone]                    #
#                                          ######################################
#########################################