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/*
** CAL - a calendar for DOS
**
** a public domain demo using Ray Gardner's SCALDATE.C scalar date functions
** by Bob Stout
*/
#include <stdio.h>
#include <stdlib.h>
/*
** function prototypes for SCALDATE.C
*/
int isleap (unsigned);
long ymd_to_scalar (unsigned, unsigned, unsigned);
/*
** calendar generation information
*/
int days[12] = {31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};
char *month[12] = {"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
char *daynames[8] = {"Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun"};
/*
** box drawing stuff
*/
#ifdef MSDOS
const char *topborder = "\xd5\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xb8";
const char *midborder = "\xc6\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xb5";
const char *botborder = "\xd4\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd\xcd"
"\xcd\xcd\xcd\xcd\xbe";
const char *line = "\xb3";
#else
const char *line = "";
#endif
/*
** tell 'em they messed up
*/
void usage(void)
{
puts("Usage: CAL m y");
puts("where: m = month (1 - 12)");
puts(" y = year (1 - 99, 1800 - 3000)");
exit(-1);
}
/*
** Define ISO to be 1 for ISO (Mon-Sun) calendars
*/
#ifndef ISO
#define ISO 0
#endif
#if (ISO != 0 && ISO != 1)
#error ISO must be set to either 0 or 1
#endif
/*
** here's where the real work's done
*/
int main(int argc, char *argv[])
{
int day, day_1, numdays, i, j;
unsigned yr, mo;
if (3 > argc)
usage();
yr = atoi(argv[2]);
mo = atoi(argv[1]);
if (!mo || 12 < mo)
usage();
if (100 > yr)
yr += 1900;
if (3000 < yr || 1800 > yr)
usage();
for (i = 0, mo -= 1; i < 3; ++i, ++mo)
{
if (!mo)
{
mo = 12;
--yr;
}
if (12 < mo)
{
mo = 1;
++yr;
}
numdays = days[mo - 1];
if (2 == mo && isleap(yr))
++numdays;
day_1 = (int)((ymd_to_scalar(yr, mo, 1) - (long)ISO) % 7L);
#ifdef MSDOS
if (!i)
puts(topborder);
#endif
fputs(line, stdout);
for (j = 0; j < 7; )
{
fputs(daynames[ISO + j], stdout);
if (7 != ++j)
fputc(' ', stdout);
}
printf("%s < %s, %d\n%s", line, month[mo - 1], yr, line);
for (day = 0; day < day_1; ++day)
fputs(" ", stdout);
for (day = 1; day <= numdays; ++day, ++day_1, day_1 %= 7)
{
if (!day_1 && 1 != day)
printf("\b%s\n%s", line, line);
printf("%3d ", day);
}
for ( ; day_1; ++day_1, day_1 %= 7)
fputs(" ", stdout);
#ifdef MSDOS
printf("\b%s\n", line);
if (2 > i)
puts(midborder);
else puts(botborder);
#else
fputc('\n', stdout);
#endif
}
return 0;
}
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