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INCLUDE
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TIME.H
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C/C++ Source or Header
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1988-04-27
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5KB
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142 lines
/*
* time.h -- time and date services.
*
* Copyright (c) 1981-1988, Mark Williams Company, Chicago
* This file and its contents may not be copied or distributed
* without permission.
*/
#ifndef TIME_H
#define TIME_H
/*
* Clock function for process timing.
* This returns raw ticks, CLK_TCK per second,
* for the process's personal interpretation.
*/
#if GEMDOS
#define CLK_TCK 200 /* 200 hz timer */
typedef unsigned long clock_t; /* 200 hz timer ticks */
#endif
clock_t clock(); /* (void) */
/*
* Time difference as a double.
*/
double difftime(); /* (time_t time1, time_t time2) */
/*
* Time function for calendar time.
* Draft ANSI standard leaves time_t implementation-dependent:
* ours is time_t is 32 bits of seconds,
* beginning January 1, 1970, 0h00m00s GMT.
*/
typedef unsigned long time_t;
time_t time(); /* (time_t *timer) */
/*
* Time fields structure: struct "tm",
* aliased to "tm_t" for neatness.
* This structure is filled in by localtime() and gmtime().
* Note that "tm_mon" is 0 through 11,
* and "tm_year" is number of years since 1900.
*/
typedef struct tm {
int tm_sec; /* Seconds (0-59) */
int tm_min; /* Minutes (0-59) */
int tm_hour; /* Hours (0-23); 0 = midnight */
int tm_mday; /* Day of month (1..28,29,30,31) */
int tm_mon; /* Month (0-11); 0 = January */
int tm_year; /* Year AD since 1900 */
int tm_wday; /* Day of week (0-6): 0 = Sunday */
int tm_yday; /* Day of year (0-365,366) */
int tm_isdst; /* Daylight savings time flag: */
/* Non-standard, they make negative==NA */
} tm_t;
/*
* Calendar time conversion functions:
*/
char *asctime(); /* tm_t fields to ascii string */
char *ctime(); /* time_t * to ascii string */
tm_t *gmtime(); /* time_t * to standard time fields */
tm_t *localtime(); /* time_t * to local time fields */
/*
* Mark Williams extensions to the draft ANSI standard:
*/
/*
* Timezone and daylight savings time implementation.
* localtime() parses the TIMEZONE environmental parameter
* or default values to set timezone, tzname[][], and daylight
* savings time parameters.
*/
extern long timezone; /* Seconds subtracted from standard time */
extern int dstadjust; /* Seconds added to local standard */
extern char tzname[2][32]; /* Names of local standard and daylight zone */
/*
* Calendar utilities:
* Gregorian calendar counted from October 1582; Julian calendar
* before that.
* The month of Gregorian adjustment isn't right.
*/
int isleapyear(); /* (year) AD */
int dayspermonth(); /* (month, year) [1..12], AD */
/*
* Julian day structure consists of the days and seconds since
* Greenwich mean noon of January 1st 4713 BC.
* COHERENT time_t is a variation of Julian time:
* it counts seconds from Julian day 2,440,587.5 (January 1, 1970).
*/
typedef struct { long j_d, j_s; } jday_t;
#define COHEPOCH 2440587L /* Julian day 1969.12.31 12h00m00s */
jday_t time_to_jday(); /* COHERENT time into Julian date */
time_t jday_to_time(); /* Julian date to coherent time */
jday_t tm_to_jday(); /* tm_t structure into Julian date */
tm_t *jday_to_tm(); /* Julian date into tm_t structure */
#if GEMDOS
/*
* Atari ST support.
* TOS time & date: packed binary date and time
* A "tetd_t" object is the object of xbios functions Gettime() and Settime().
* The halves are the objects of gemdos Tgettime(), Tgetdate(), Tsettime(),
* Tsetdate().
* The file time and date stamps that Fdatime(), Fsfirst(),
* and Fsnext() maintain are rtetd_t format:
* they reverse the order of the time
* and date fields from the utetd_t format used by Gettime() and Settime().
*/
typedef unsigned long tetd_t;
typedef struct { unsigned g_date, g_time; } utetd_t;
typedef struct { unsigned g_rtime, g_rdate; } rtetd_t;
tetd_t tm_to_tetd(); /* tm_t structure into TOS time and date */
tm_t *tetd_to_tm(); /* TOS time and date into tm_t */
#define tetd_to_jday(td) tm_to_jday(tetd_to_tm(td))
#define jday_to_tetd(jd) tm_to_tetd(jday_to_tm(jd))
#define tetd_to_time(td) jday_to_time(tetd_to_jday(td))
#define time_to_tetd(t) jday_to_tetd(time_to_jday(t))
/*
* The intelligent keyboard keeps time to the second
* which neither xbios or gemdos support.
* These two functions operate on tm_t objects.
*/
tm_t *Kgettime(); /* (void) */
int Ksettime(); /* (tm_t *timep) */
/*
* Similar routines for the XBIOS time.
* These two functions operate on tm_t objects.
*/
tm_t *Sgettime(); /* (void) */
int Ssettime(); /* (tm_t *timep) */
#endif
#endif
/* end of time.h */