mirror of
https://github.com/byteworksinc/ORCA-C.git
synced 2024-06-07 19:29:29 +00:00
289 lines
7.2 KiB
C++
289 lines
7.2 KiB
C++
/***************************************************************
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*
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* Calendar
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*
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* This classic desk accessory shows the calendar for the
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* current date. The arrow keys can be used to see calendars
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* for previous or future months.
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*
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* Commands (each is a single keystroke)
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*
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* up-arrow Look at the same month in the previous
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* year.
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* down-arrow Look at the same month in the next
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* year.
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* left-arrow Look at the previous month.
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* right-arrow Look at the next month.
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* ? or / Display help screen.
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* ESC Return to CDA main menu.
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*
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* Mike Westerfield
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*
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* Copyright 1987-1989
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* Byte Works, Inc.
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*
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***************************************************************/
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#pragma keep "Calendar"
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#pragma cda "Calendar" Start ShutDown
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#pragma lint -1
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#include <stddef.h>
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#include <stdio.h>
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#include <time.h>
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#include <misctool.h>
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#define LEFT_ARROW 0x08 /* key codes for legal commands */
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#define DOWN_ARROW 0x0A
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#define UP_ARROW 0x0B
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#define RIGHT_ARROW 0x15
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#define ESC 0x1B
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#define SLASH '/'
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#define QUESTION '?'
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int ch; /* ord of last character read */
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int month, year; /* current month and year */
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/****************************************************************
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*
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* Factor: Computes the 'factor' for the first day of the
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* month. The factor is the number of days since
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* 31 Dec 0000.
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*
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****************************************************************/
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long Factor (long year, long month)
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{
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if (month < 2)
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return 365 * year + 1 + 31 * month + (year - 1) / 4 -
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((year - 1) / 100 + 1) * 3 / 4;
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return 365 * year + 1 + 31 * month - ((month + 1) * 4 + 23) / 10 +
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year / 4 - (year / 100 + 1) * 3 / 4;
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}
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/****************************************************************
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*
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* GetKey: Returns the ordinal value of the next key typed
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* by the user.
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*
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****************************************************************/
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int GetKey (void)
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{
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char ch, *cp;
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cp = (char *) 0x00C000; /* wait for keypress */
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while ((*cp & 0x80) == 0) ;
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ch = *cp; /* save the key */
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cp = (char *) 0x00C010; /* clear the strobe */
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*cp = 0;
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return ch & 0x7F; /* return the key read */
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}
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/****************************************************************
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*
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* GetThisMonth: Reads the clock to obtain today's month
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*
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****************************************************************/
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void GetThisMonth (void)
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{
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time_t lt; /* encoded time */
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struct tm *ct; /* current time */
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lt = time(NULL); /* get the coded time */
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ct = gmtime(<); /* convert to a decoded time */
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year = ct->tm_year + 1900; /* set the month/year */
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month = ct->tm_mon;
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}
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/****************************************************************
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*
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* GotoXY: Positions the cursor
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*
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****************************************************************/
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void GotoXY (int x, int y)
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{
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putchar(0x1E);
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putchar(0x20 + x);
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putchar(0x20 + y);
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}
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/****************************************************************
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*
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* PrintCalendar: Prints the calendar for the current
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* and year.
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*
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****************************************************************/
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void PrintCalendar (void)
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{
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#define TAB 26 /* disp of calendar from left edge */
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#define VTAB 5 /* disp of calendar from top */
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int startDay, /* day of week for 1st day in month */
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numDays, /* # days in the month */
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nextMonth, nextYear, /* work variables */
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i, /* loop variable */
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vt, /* line # for next line of days */
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pos; /* day position for next date */
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/* Compute day of week for 1st day in month */
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startDay = (int) ((Factor (year, month) - 1) % 7);
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nextMonth = month+1; /* compute # days in month */
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if (nextMonth == 12) {
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nextMonth = 0;
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nextYear = year+1;
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}
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else
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nextYear = year;
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numDays = (int) (Factor (nextYear, nextMonth) - Factor (year, month));
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putchar(12); /* clear the screen */
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GotoXY(TAB+7, VTAB); /* position cursor */
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switch (month) { /* write the month */
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case 0: printf(" January "); break;
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case 1: printf("February "); break;
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case 2: printf(" March "); break;
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case 3: printf(" April "); break;
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case 4: printf(" May "); break;
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case 5: printf(" June "); break;
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case 6: printf(" July "); break;
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case 7: printf(" August "); break;
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case 8: printf("September "); break;
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case 9: printf(" October "); break;
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case 10: printf("November "); break;
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case 11: printf("December ");
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}
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printf("%d", year); /* write the year */
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GotoXY(TAB, VTAB+2); /* write the day header line */
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printf("Sun Mon Tue Wed Thu Fri Sat");
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vt = VTAB+4; /* set current date line */
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pos = 0; /* set day position */
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GotoXY(TAB-1, vt); /* position cursor for 1st line */
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for (i = 1; i <= startDay; i++) { /* skip over blank days */
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pos++;
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printf(" ");
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}
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/* Write the dates */
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for (i = 1; i <= numDays; i++) {
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printf("%4d", i);
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pos++;
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if (pos == 7) {
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pos = 0;
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vt += 2;
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GotoXY(TAB-1, vt);
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}
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}
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GotoXY(25, 23); /* write instructions */
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printf("Hit ? for help, or ESC to quit");
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}
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/****************************************************************
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*
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* PrintHelp: Print the help screen.
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*
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****************************************************************/
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void PrintHelp (void)
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{
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int ch; /* dummy variable for reading keyboard */
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putchar(0x0C); /* clear screen */
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printf( "This program recognizes the following single-keystroke commands:"
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"\n\n"
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" key action\n"
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" --- ------\n"
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" up-arrow Show the current month in the previous year.\n"
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" down-arrow Show the current month in the next year.\n"
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" left-arrow Show the previous month.\n"
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" right-arrow Show the next month.\n"
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" ESC exit the program.");
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GotoXY(0, 23);
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printf("Hit any key to return to the program.");
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ch = GetKey();
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}
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/**************************************************************
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*
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* Start: Body of calendar program
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*
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**************************************************************/
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void Start(void)
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{
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putchar('\006'); /* turn the cursor off */
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GetThisMonth(); /* find out what month it is */
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PrintCalendar(); /* print the calendar for this month */
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do {
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ch = GetKey(); /* get a command */
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switch (ch) {
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case LEFT_ARROW: {
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month--;
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if (month < 0) {
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month = 11;
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year--;
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}
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PrintCalendar();
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break;
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}
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case RIGHT_ARROW: {
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month++;
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if (month > 11) {
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month = 0;
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year++;
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}
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PrintCalendar();
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break;
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}
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case UP_ARROW: {
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year--;
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PrintCalendar();
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break;
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}
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case DOWN_ARROW: {
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year++;
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PrintCalendar();
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break;
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}
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case QUESTION:
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case SLASH: {
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PrintHelp();
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PrintCalendar();
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break;
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}
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case ESC: return;
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default:
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SysBeep();
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}
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}
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while (1);
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}
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/*************************************************************
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*
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* ShutDown: Does nothing
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*
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*************************************************************/
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void ShutDown(void)
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{
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}
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