/* Copyright (C) 1991, 1992 Free Software Foundation, Inc.
This file is part of the GNU C Library.

The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.

The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
Library General Public License for more details.

You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB.  If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA.  */

/*
 *	ANSI Standard: 4.12 DATE and TIME	<time.h>
 */

#ifndef	_TIME_H

#if	!defined(__need_time_t) && !defined(__need_clock_t)
#define	_TIME_H		1
#include <features.h>
#endif

#ifdef	_TIME_H
/* Get size_t and NULL from <stddef.h>.  */
#define	__need_size_t
#define	__need_NULL
#include <stddef.h>
#endif	/* <time.h> included.  */



#ifdef	_TIME_H
/* Processor clock ticks per second.  */
#define	CLOCKS_PER_SEC	1	/* ??? */

#ifdef	__USE_POSIX
#define	CLK_TCK		60	/* ??? */
#endif

#endif	/* <time.h> included.  */


#if	!defined(__clock_t_defined) &&			\
	(defined(_TIME_H) || defined(__need_clock_t))
#define	__clock_t_defined	1

/* Returned by `clock'.  */
typedef long int clock_t;

#endif	/* clock_t not defined and <time.h> or need clock_t.  */
#undef	__need_clock_t

#if	!defined(__time_t_defined) &&			\
	(defined(_TIME_H) || defined(__need_time_t))
#define	__time_t_defined	1

#include <gnu/types.h>

/* Returned by `time'.  */
typedef __time_t time_t;

#endif	/* time_t not defined and <time.h> or need time_t.  */
#undef	__need_time_t


#ifdef	_TIME_H
/* Used by other time functions.  */
struct tm
  {
    int tm_sec;		/* Seconds.	[0-61] (2 leap seconds) */
    int tm_min;		/* Minutes.	[0-59] */
    int tm_hour;	/* Hours.	[0-23] */
    int tm_mday;	/* Day.		[1-31] */
    int tm_mon;		/* Month.	[0-11] */
    int tm_year;	/* Year	- 1900.  */
    int tm_wday;	/* Day of week.	[0-6] */
    int tm_yday;	/* Days in year.[0-365]	*/
    int tm_isdst;	/* DST.		[-1/0/1]*/
    long int tm_gmtoff;	/* Seconds west of UTC.  */
    CONST char *tm_zone;/* Timezone abbreviation.  */
  };
#endif	/* <time.h> included.  */


#ifdef	_TIME_H
/* Time used by the program so far (user time + system time).
   The result / CLOCKS_PER_SECOND is program time in seconds.  */
extern clock_t EXFUN(clock, (NOARGS));

/* Return the current time and put it in *TIMER if TIMER is not NULL.  */
extern time_t EXFUN(time, (time_t *__timer));

#ifndef	__CONSTVALUE
#ifdef	__GNUC__
/* The `const' keyword tells GCC that a function's return value is
   based solely on its arguments, and there are no side-effects.  */
#define	__CONSTVALUE	__const
#else
#define	__CONSTVALUE
#endif	/* GCC.  */
#endif	/* __CONSTVALUE not defined.  */

/* Return the difference between TIME1 and TIME0.  */
extern __CONSTVALUE double EXFUN(difftime, (time_t __time1, time_t __time0));

/* Return the `time_t' representation of TP and normalize TP.  */
extern time_t EXFUN(mktime, (struct tm *__tp));


/* Format TP into S according to FORMAT.
   Write no more than MAXSIZE characters and return the number
   of characters written, or 0 if it would exceed MAXSIZE.  */
extern size_t EXFUN(strftime, (char *__s, size_t __maxsize,
			       CONST char *__format, CONST struct tm *__tp));


/* Return the `struct tm' representation of *TIMER
   in Universal Coordinated Time (aka Greenwich Mean Time).  */
extern struct tm *EXFUN(gmtime, (CONST time_t *__timer));

/* Return the `struct tm' representation
   of *TIMER in the local timezone.  */
extern struct tm *EXFUN(localtime, (CONST time_t *__timer));

/* Return the `struct tm' representation of *TIMER,
   offset OFFSET seconds east of Universal Coordinated Time.  */
extern struct tm *EXFUN(__offtime, (CONST time_t *__timer, long int __offset));

#ifdef	__OPTIMIZE__
#define	gmtime(timer)	__offtime((timer), 0L)
#endif	/* Optimizing.  */


/* Return a string of the form "Day Mon dd hh:mm:ss yyyy\n"
   that is the representation of TP in this format.  */
extern char *EXFUN(asctime, (CONST struct tm *__tp));

/* Equivalent to `asctime(localtime(timer))'.  */
extern char *EXFUN(ctime, (CONST time_t *__timer));


/* Defined in localtime.c.  */
extern char *__tzname[2];	/* Current timezone names.  */
extern int __daylight;		/* If it is daylight savings time.  */
extern long int __timezone;	/* Seconds west of UTC.  */

/* Set time conversion information from the TZ environment variable.
   If TZ is not defined, a locale-dependent default is used.  */
extern void EXFUN(__tzset, (NOARGS));

#ifdef	__USE_POSIX
/* Same as above.  */
extern char *tzname[2];

extern long int EXFUN(__tzname_max, (NOARGS));

extern void EXFUN(tzset, (NOARGS));
#ifdef	__OPTIMIZE__
#define	tzset()	__tzset()
#endif	/* Optimizing.  */
#endif

#ifdef	__USE_SVID
extern int daylight;
extern long int timezone;
#endif


/* Nonzero if YEAR is a leap year (every 4 years,
   except every 100th isn't, and every 400th is).  */
#define	__isleap(year)	\
  ((year) % 4 == 0 && ((year) % 100 != 0 || (year) % 400 == 0))

#endif	/* <time.h> included.  */

#endif	/* <time.h> not already included.  */