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263 lines
9.9 KiB
C
263 lines
9.9 KiB
C
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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*----------------------------------------------------------------------
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*
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* prtime.h --
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*
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* NSPR date and time functions
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*
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*-----------------------------------------------------------------------
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*/
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#ifndef prtime_h___
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#define prtime_h___
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#include "prlong.h"
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PR_BEGIN_EXTERN_C
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/**********************************************************************/
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/************************* TYPES AND CONSTANTS ************************/
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/**********************************************************************/
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#define PR_MSEC_PER_SEC 1000L
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#define PR_USEC_PER_SEC 1000000L
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#define PR_NSEC_PER_SEC 1000000000L
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#define PR_USEC_PER_MSEC 1000L
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#define PR_NSEC_PER_MSEC 1000000L
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/*
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* PRTime --
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*
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* NSPR represents basic time as 64-bit signed integers relative
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* to midnight (00:00:00), January 1, 1970 Greenwich Mean Time (GMT).
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* (GMT is also known as Coordinated Universal Time, UTC.)
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* The units of time are in microseconds. Negative times are allowed
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* to represent times prior to the January 1970 epoch. Such values are
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* intended to be exported to other systems or converted to human
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* readable form.
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*
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* Notes on porting: PRTime corresponds to time_t in ANSI C. NSPR 1.0
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* simply uses PRInt64.
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*/
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typedef PRInt64 PRTime;
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/*
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* Time zone and daylight saving time corrections applied to GMT to
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* obtain the local time of some geographic location
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*/
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typedef struct PRTimeParameters {
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PRInt32 tp_gmt_offset; /* the offset from GMT in seconds */
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PRInt32 tp_dst_offset; /* contribution of DST in seconds */
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} PRTimeParameters;
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/*
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* PRExplodedTime --
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*
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* Time broken down into human-readable components such as year, month,
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* day, hour, minute, second, and microsecond. Time zone and daylight
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* saving time corrections may be applied. If they are applied, the
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* offsets from the GMT must be saved in the 'tm_params' field so that
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* all the information is available to reconstruct GMT.
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*
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* Notes on porting: PRExplodedTime corrresponds to struct tm in
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* ANSI C, with the following differences:
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* - an additional field tm_usec;
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* - replacing tm_isdst by tm_params;
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* - the month field is spelled tm_month, not tm_mon;
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* - we use absolute year, AD, not the year since 1900.
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* The corresponding type in NSPR 1.0 is called PRTime. Below is
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* a table of date/time type correspondence in the three APIs:
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* API time since epoch time in components
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* ANSI C time_t struct tm
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* NSPR 1.0 PRInt64 PRTime
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* NSPR 2.0 PRTime PRExplodedTime
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*/
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typedef struct PRExplodedTime {
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PRInt32 tm_usec; /* microseconds past tm_sec (0-99999) */
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PRInt32 tm_sec; /* seconds past tm_min (0-61, accomodating
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up to two leap seconds) */
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PRInt32 tm_min; /* minutes past tm_hour (0-59) */
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PRInt32 tm_hour; /* hours past tm_day (0-23) */
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PRInt32 tm_mday; /* days past tm_mon (1-31, note that it
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starts from 1) */
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PRInt32 tm_month; /* months past tm_year (0-11, Jan = 0) */
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PRInt16 tm_year; /* absolute year, AD (note that we do not
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count from 1900) */
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PRInt8 tm_wday; /* calculated day of the week
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(0-6, Sun = 0) */
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PRInt16 tm_yday; /* calculated day of the year
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(0-365, Jan 1 = 0) */
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PRTimeParameters tm_params; /* time parameters used by conversion */
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} PRExplodedTime;
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/*
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* PRTimeParamFn --
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*
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* A function of PRTimeParamFn type returns the time zone and
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* daylight saving time corrections for some geographic location,
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* given the current time in GMT. The input argument gmt should
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* point to a PRExplodedTime that is in GMT, i.e., whose
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* tm_params contains all 0's.
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*
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* For any time zone other than GMT, the computation is intended to
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* consist of two steps:
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* - Figure out the time zone correction, tp_gmt_offset. This number
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* usually depends on the geographic location only. But it may
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* also depend on the current time. For example, all of China
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* is one time zone right now. But this situation may change
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* in the future.
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* - Figure out the daylight saving time correction, tp_dst_offset.
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* This number depends on both the geographic location and the
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* current time. Most of the DST rules are expressed in local
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* current time. If so, one should apply the time zone correction
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* to GMT before applying the DST rules.
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*/
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typedef PRTimeParameters (PR_CALLBACK *PRTimeParamFn)(const PRExplodedTime *gmt);
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/**********************************************************************/
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/****************************** FUNCTIONS *****************************/
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/**********************************************************************/
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/*
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* The PR_Now routine returns the current time relative to the
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* epoch, midnight, January 1, 1970 UTC. The units of the returned
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* value are microseconds since the epoch.
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*
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* The values returned are not guaranteed to advance in a linear fashion
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* due to the application of time correction protocols which synchronize
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* computer clocks to some external time source. Consequently it should
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* not be depended on for interval timing.
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*
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* The implementation is machine dependent.
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* Cf. time_t time(time_t *tp) in ANSI C.
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*/
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NSPR_API(PRTime)
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PR_Now(void);
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/*
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* Expand time binding it to time parameters provided by PRTimeParamFn.
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* The calculation is envisoned to proceed in the following steps:
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* - From given PRTime, calculate PRExplodedTime in GMT
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* - Apply the given PRTimeParamFn to the GMT that we just calculated
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* to obtain PRTimeParameters.
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* - Add the PRTimeParameters offsets to GMT to get the local time
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* as PRExplodedTime.
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*/
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NSPR_API(void) PR_ExplodeTime(
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PRTime usecs, PRTimeParamFn params, PRExplodedTime *exploded);
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/* Reverse operation of PR_ExplodeTime */
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NSPR_API(PRTime)
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PR_ImplodeTime(const PRExplodedTime *exploded);
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/*
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* Adjust exploded time to normalize field overflows after manipulation.
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* Note that the following fields of PRExplodedTime should not be
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* manipulated:
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* - tm_month and tm_year: because the number of days in a month and
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* number of days in a year are not constant, it is ambiguous to
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* manipulate the month and year fields, although one may be tempted
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* to. For example, what does "a month from January 31st" mean?
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* - tm_wday and tm_yday: these fields are calculated by NSPR. Users
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* should treat them as "read-only".
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*/
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NSPR_API(void) PR_NormalizeTime(
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PRExplodedTime *exploded, PRTimeParamFn params);
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/**********************************************************************/
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/*********************** TIME PARAMETER FUNCTIONS *********************/
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/**********************************************************************/
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/* Time parameters that suit current host machine */
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NSPR_API(PRTimeParameters) PR_LocalTimeParameters(const PRExplodedTime *gmt);
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/* Time parameters that represent Greenwich Mean Time */
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NSPR_API(PRTimeParameters) PR_GMTParameters(const PRExplodedTime *gmt);
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/*
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* Time parameters that represent the US Pacific Time Zone, with the
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* current daylight saving time rules (for testing only)
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*/
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NSPR_API(PRTimeParameters) PR_USPacificTimeParameters(const PRExplodedTime *gmt);
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/*
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* This parses a time/date string into a PRExplodedTime
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* struct. It populates all fields but it can't split
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* the offset from UTC into tp_gmt_offset and tp_dst_offset in
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* most cases (exceptions: PST/PDT, MST/MDT, CST/CDT, EST/EDT, GMT/BST).
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* In those cases tp_gmt_offset will be the sum of these two and
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* tp_dst_offset will be 0.
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* It returns PR_SUCCESS on success, and PR_FAILURE
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* if the time/date string can't be parsed.
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*
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* Many formats are handled, including:
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*
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* 14 Apr 89 03:20:12
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* 14 Apr 89 03:20 GMT
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* Fri, 17 Mar 89 4:01:33
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* Fri, 17 Mar 89 4:01 GMT
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* Mon Jan 16 16:12 PDT 1989
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* Mon Jan 16 16:12 +0130 1989
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* 6 May 1992 16:41-JST (Wednesday)
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* 22-AUG-1993 10:59:12.82
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* 22-AUG-1993 10:59pm
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* 22-AUG-1993 12:59am
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* 22-AUG-1993 12:59 PM
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* Friday, August 04, 1995 3:54 PM
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* 06/21/95 04:24:34 PM
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* 20/06/95 21:07
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* 95-06-08 19:32:48 EDT
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*
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* If the input string doesn't contain a description of the timezone,
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* we consult the `default_to_gmt' to decide whether the string should
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* be interpreted relative to the local time zone (PR_FALSE) or GMT (PR_TRUE).
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* The correct value for this argument depends on what standard specified
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* the time string which you are parsing.
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*/
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NSPR_API(PRStatus) PR_ParseTimeStringToExplodedTime (
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const char *string,
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PRBool default_to_gmt,
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PRExplodedTime *result);
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/*
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* This uses PR_ParseTimeStringToExplodedTime to parse
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* a time/date string and PR_ImplodeTime to transform it into
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* a PRTime (microseconds after "1-Jan-1970 00:00:00 GMT").
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* It returns PR_SUCCESS on success, and PR_FAILURE
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* if the time/date string can't be parsed.
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*/
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NSPR_API(PRStatus) PR_ParseTimeString (
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const char *string,
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PRBool default_to_gmt,
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PRTime *result);
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/* Format a time value into a buffer. Same semantics as strftime() */
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NSPR_API(PRUint32) PR_FormatTime(char *buf, int buflen, const char *fmt,
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const PRExplodedTime *tm);
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/* Format a time value into a buffer. Time is always in US English format, regardless
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* of locale setting.
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*/
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NSPR_API(PRUint32)
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PR_FormatTimeUSEnglish( char* buf, PRUint32 bufSize,
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const char* format, const PRExplodedTime* tm );
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PR_END_EXTERN_C
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#endif /* prtime_h___ */
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