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authorRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
committerRoland McGrath <roland@gnu.org>1995-02-18 01:27:10 +0000
commit28f540f45bbacd939bfd07f213bcad2bf730b1bf (patch)
tree15f07c4c43d635959c6afee96bde71fb1b3614ee /time/time.h
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+/* Copyright (C) 1991, 1992, 1993, 1994, 1995 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, 1992 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>
+
+__BEGIN_DECLS
+
+#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 clock __P ((void));
+
+/* Return the current time and put it in *TIMER if TIMER is not NULL.  */
+extern time_t time __P ((time_t *__timer));
+
+/* Return the difference between TIME1 and TIME0.  */
+extern double difftime __P ((time_t __time1, time_t __time0))
+     __attribute__ ((__const__));
+
+/* Return the `time_t' representation of TP and normalize TP.  */
+extern time_t mktime __P ((struct tm *__tp));
+
+/* Subroutine of `mktime'.  Return the `time_t' representation of TP and
+   normalize TP, given that a `struct tm *' maps to a `time_t' as performed
+   by FUNC.  */
+extern time_t _mktime_internal __P ((struct tm *__tp,
+				     struct tm *(*__func) (const time_t *)));
+
+
+/* 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 strftime __P ((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 *gmtime __P ((__const time_t *__timer));
+
+/* Return the `struct tm' representation
+   of *TIMER in the local timezone.  */
+extern struct tm *localtime __P ((__const time_t *__timer));
+
+/* Return the `struct tm' representation of *TIMER,
+   offset OFFSET seconds east of Universal Coordinated Time.  */
+extern struct tm *__offtime __P ((__const time_t *__timer,
+				  long int __offset));
+
+/* 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 *asctime __P ((__const struct tm *__tp));
+
+/* Equivalent to `asctime(localtime(timer))'.  */
+extern char *ctime __P ((__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 __tzset __P ((void));
+
+#ifdef	__USE_POSIX
+/* Same as above.  */
+extern char *tzname[2];
+
+/* Return the maximum length of a timezone name.
+   This is what `sysconf (_SC_TZNAME_MAX)' does.  */
+extern long int __tzname_max __P ((void));
+
+extern void tzset __P ((void));
+#ifdef	__OPTIMIZE__
+#define	tzset()	__tzset()
+#endif /* Optimizing.  */
+#endif
+
+#ifdef	__USE_SVID
+extern int daylight;
+extern long int timezone;
+
+/* Set the system time to *WHEN.
+   This call is restricted to the superuser.  */
+extern int stime __P ((__const time_t *__when));
+#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))
+
+
+#ifdef __USE_MISC
+/* Miscellaneous functions many Unices inherited from the public domain
+   localtime package.  These are included only for compatibility.  */
+
+/* Like `mktime', but for TP represents Universal Time, not local time.  */
+extern time_t timegm __P ((struct tm *__tp));
+
+/* Another name for `mktime'.  */
+extern time_t timelocal __P ((struct tm *__tp));
+
+/* Return the number of days in YEAR.  */
+extern int dysize __P ((int __year));
+#endif
+
+
+__END_DECLS
+
+#endif /* <time.h> included.  */
+
+#endif /* <time.h> not already included.  */