mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-22 21:10:07 +00:00
80fd73873b
Rewrite mktime from scratch for performance, and for correctness in the presence of leap seconds. * time/mktime.c (ydhms_tm_diff, not_equal_tm, print_tm, check_result): New functions. (LEAP_SECONDS_POSSIBLE, CHAR_BIT, INT_MIN, INT_MAX, TIME_T_MIN, TIME_T_MAX, TM_YEAR_BASE, EPOCH_YEAR): New macros. <limits.h>, <stdlib.h>: New #includes. (main): Support tests with given broken-down value; support benchmarks. (__mon_lengths, debugging_enabled, printtm, dist_tm, doit, do_normalization, normalize, BAD_STRUCT_TM, SKIP_VALUE, <ctype.h>): Remove. * time/time.h, time/mktime.c (__mktime_internal): New offset arg. * time/mktime.c (mktime), time/timegm.c (timegm): Use it. * time/mktime.c (__mon_yday): New variable; replaces `__mon_lengths'. time/offtime.c (__offtime), time/tzset.c (compute_change): Use it. * time/offtime.c (__offtime): Remove useless assignment `tp->tm_isdst = -1'. * manual/maint.texi: Update credits. Fri Oct 6 00:28:53 1995 Roland McGrath <roland@churchy.gnu.ai.mit.edu> * sysdeps/unix/common/readv.S: Moved to sysdeps/unix/bsd. * sysdeps/unix/common/writev.S: Moved to sysdeps/unix/bsd. * sysdeps/unix/sysv/linux/readv.c: File removed. * sysdeps/unix/sysv/linux/writev.c: File removed. * sysdeps/unix/configure.in: Check for readv and writev syscalls. * sysdeps/unix/configure.in: If eval doesn't set $unix_srcname, set it to $unix_syscall instead of $unix_function.
225 lines
6.6 KiB
C
225 lines
6.6 KiB
C
/* 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. Keep track of next guess for time_t offset in *OFFSET. */
|
|
extern time_t __mktime_internal __P ((struct tm *__tp,
|
|
struct tm *(*__func) (const time_t *,
|
|
struct tm *),
|
|
time_t *__offset));
|
|
|
|
|
|
/* 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));
|
|
|
|
#ifdef __USE_REENTRANT
|
|
/* Return the `struct tm' representation of *TIMER in UTC,
|
|
using *TP to store the result. */
|
|
extern struct tm *__gmtime_r __P ((__const time_t *__timer,
|
|
struct tm *__tp));
|
|
extern struct tm *gmtime_r __P ((__const time_t *__timer,
|
|
struct tm *__tp));
|
|
|
|
/* Return the `struct tm' representation of *TIMER in local time,
|
|
using *TP to store the result. */
|
|
extern struct tm *__localtime_r __P ((__const time_t *__timer,
|
|
struct tm *__tp));
|
|
extern struct tm *localtime_r __P ((__const time_t *__timer,
|
|
struct tm *__tp));
|
|
#endif
|
|
|
|
/* Compute the `struct tm' representation of *T,
|
|
offset OFFSET seconds east of UTC,
|
|
and store year, yday, mon, mday, wday, hour, min, sec into *TP. */
|
|
extern void __offtime __P ((__const time_t *__timer,
|
|
long int __offset,
|
|
struct tm *__TP));
|
|
|
|
/* 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. */
|