MUD programming in C

#define SEC_PER_MUD_MIN		3
#define SEC_PER_MUD_HOUR	(60*SEC_PER_MUD_MIN)	/*     180 */
#define SEC_PER_MUD_DAY		(24*SEC_PER_MUD_HOUR)	/*    4320 */
#define SEC_PER_MUD_MONTH	(32*SEC_PER_MUD_DAY)	/*  138240 */
#define SEC_PER_MUD_YEAR	(20*SEC_PER_MUD_MONTH)	/* 2764800 */

// decade name 
const char *decade_name[] = {
						/*  1 */	"the Rebirth"	,
						/*  2 */	"the Twin Towers"	,
						/*  3 */	"Asheron's Call"	,
						/*  4 */	"the Black Rain"	,
						/*  5 */	"the Blinding"	,
						/*  6 */	"the First Sight"	,
						/*  7 */	"the Moon Rivers"	,
						/*  8 */	"the Sky Fall"	,
						/*  9 */	"the Shields of Fate"	,
						/* 10 */	"the Fates"	,
						/* 11 */	"the Great Battles"	,
						/* 12 */	"the Revolt"	,
						/* 13 */	"the Rebellion"	,
						/* 14 */	"Mica's Regret"	,
						/* 15 */	"the Fierce Winds"	} ;

const char *month_name[] = {
						/*  1 */	"Month of Terebrinth"	,
						/*  2 */	"Month of Czuven Lith"	,
						/*  3 */	"Month of Cian"	,
						/*  4 */	"Month of Diere"	,
						/*  5 */	"Month of Garai"	,
						/*  6 */	"Month of Shevatt"	,
						/*  7 */	"Month of Juno"	,
						/*  8 */	"Month of Micah"	,
						/*  9 */	"Month of Ezra"	,
						/* 10 */	"Month of Durai"	,
						/* 11 */	"Month of Poshu"	,
						/* 12 */	"Month of Quezacotl"	,
						/* 13 */	"Month of Armagged"	,
						/* 14 */	"Month of Osiris"	,
						/* 15 */	"Month of Iris"	,
						/* 16 */	"Month of Ar"	,
						/* 17 */	"Month of MonThaire"	,
						/* 18 */	"Month of Iezapeth"	,
						/* 19 */	"Month of Ttannia"	,
						/* 20 */	"Month of Zerynth"	,
} ;

// day of the week 
const char *day_of_week[] = {
								/* Holy     */	"the Day of Sunnan"		,
								/* Wind     */	"the Day of Celes"		,
								/* Fire     */	"the Day of Helios"		,
								/* Earth    */	"the Day of Zovogath"	,
								/* Water    */	"the Day of Leviath"	,
								/* Thunder  */	"the Day of Innothor"	,
								/* Dark	    */	"the Day of Anak-zuul"	,
								/* Strength */	"the Day of Runaeis"		} ;


// time information container
typedef struct 
{
	unsigned int	year	:	32 ;
	unsigned int	months	:	8 ;		// 20 months in a year
	unsigned int	days	:	8 ;		// 32 days in a month
	unsigned int	hours	:	8;		// 24 hours a day
	unsigned int	minutes :	8;		// 60 minutes an hour
} M_TIME_DATA;



// gets the current MUD time based on the beginning of time
M_TIME_DATA get_current_mud_time(time_t epoch, time_t current_time)
{
	M_TIME_DATA		now ;
	unsigned long	seconds_passed ;

	seconds_passed = (unsigned long) (current_time - epoch) ;
	memset(&now, 0x00, sizeof(M_TIME_DATA)) ;
	now.minutes = (seconds_passed/SEC_PER_MUD_MIN) % 60;	// 0..59
	seconds_passed -= SEC_PER_MUD_MIN * now.minutes;

	now.hours = (seconds_passed/SEC_PER_MUD_HOUR) % 24;		// 0..23
	seconds_passed -= SEC_PER_MUD_HOUR * now.hours;

	now.days = (seconds_passed/SEC_PER_MUD_DAY) % 32 ;		// 0..31
	seconds_passed -= SEC_PER_MUD_DAY * now.days;

	now.months = (seconds_passed/SEC_PER_MUD_MONTH) % 20;	// 0..19
	seconds_passed -= SEC_PER_MUD_MONTH * now.months;

	now.year = (seconds_passed/SEC_PER_MUD_YEAR);			// 0..1553 years

	return now ;
}

// make the time readable to players
void say_time(M_TIME_DATA time_info)
{
	char			am_pm[14] ;
	char			*suf ;
	char			minutes[3] ;
	char			minute_buff[3] ;
	unsigned long	hours ;
	unsigned int	day ;
	unsigned int	decade = 0;

	memset(&am_pm, 0x00, (sizeof(char)*14)) ;
	memset(&minutes, 0x00, (sizeof(char)*3)) ;
	memset(&minute_buff, 0x00, (sizeof(char)*3)) ;

	// determine if AM or PM 
	((time_info.hours < 12) && (time_info.minutes <= 59)) ? strncpy(am_pm, &quot;Ante Meridian&quot;, 14)
		: strncpy(am_pm, &quot;Post Meridian&quot;, 14) ;
	hours = ((time_info.hours % 12) == 0) ? 12 : (time_info.hours % 12) ; // change 0 to 12

	// padd additional '0' to minutes if less than 10
	itoa(time_info.minutes, minute_buff, 10);
	if (time_info.minutes < 10) {
		minutes[0] = '0' ;
		strncat(minutes, minute_buff, 1) ;
	} else {
		strncpy(minutes, minute_buff, 2) ;
	}

	day = time_info.days + 1 ; /* 1..32 */
	// add the suffixes
	if (day == 1)
		suf = &quot;st&quot;;
	else if (day == 2)
		suf = &quot;nd&quot;;
	else if (day == 3)
		suf = &quot;rd&quot;;
	else if (day < 20)
		suf = &quot;th&quot;;
	else if ((day % 10) == 1)
		suf = &quot;st&quot;;
	else if ((day % 10) == 2)
		suf = &quot;nd&quot;;
	else if ((day % 10) == 3)
		suf = &quot;rd&quot;;
	else
		suf = &quot;th&quot;;
	
	printf(&quot;The current time is %d:%s %s.\n&quot;, hours, minutes, am_pm) ;
	printf(&quot;This is %s, %d%s of the %s, the year %d of %s.\n&quot;, 
		day_of_week[(time_info.days%8)], day, suf, month_name[(time_info.months%20)], 
		time_info.year, decade_name[decade]) ;
	
}

int main(void)
{
	unsigned long		beginning_of_time	= 0 ;
	unsigned long		test_time			= 2764800 ;
	M_TIME_DATA	time_info ;

	for(;;) {
		test_time += SEC_PER_MUD_YEAR ;
		time_info = get_current_mud_time(beginning_of_time, test_time);	
		printf(&quot;test_time value:%l [%X]\n&quot;, test_time, test_time) ;
		say_time(time_info) ;
	}
	return 0;
}

unsigned long

test_time

test_time