| 1 | /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|---|
| 2 | /* ***** BEGIN LICENSE BLOCK *****
|
|---|
| 3 | * Version: MPL 1.1/GPL 2.0/LGPL 2.1
|
|---|
| 4 | *
|
|---|
| 5 | * The contents of this file are subject to the Mozilla Public License Version
|
|---|
| 6 | * 1.1 (the "License"); you may not use this file except in compliance with
|
|---|
| 7 | * the License. You may obtain a copy of the License at
|
|---|
| 8 | * http://www.mozilla.org/MPL/
|
|---|
| 9 | *
|
|---|
| 10 | * Software distributed under the License is distributed on an "AS IS" basis,
|
|---|
| 11 | * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
|
|---|
| 12 | * for the specific language governing rights and limitations under the
|
|---|
| 13 | * License.
|
|---|
| 14 | *
|
|---|
| 15 | * The Original Code is the Netscape Portable Runtime (NSPR).
|
|---|
| 16 | *
|
|---|
| 17 | * The Initial Developer of the Original Code is
|
|---|
| 18 | * Netscape Communications Corporation.
|
|---|
| 19 | * Portions created by the Initial Developer are Copyright (C) 1998-2000
|
|---|
| 20 | * the Initial Developer. All Rights Reserved.
|
|---|
| 21 | *
|
|---|
| 22 | * Contributor(s):
|
|---|
| 23 | *
|
|---|
| 24 | * Alternatively, the contents of this file may be used under the terms of
|
|---|
| 25 | * either the GNU General Public License Version 2 or later (the "GPL"), or
|
|---|
| 26 | * the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
|
|---|
| 27 | * in which case the provisions of the GPL or the LGPL are applicable instead
|
|---|
| 28 | * of those above. If you wish to allow use of your version of this file only
|
|---|
| 29 | * under the terms of either the GPL or the LGPL, and not to allow others to
|
|---|
| 30 | * use your version of this file under the terms of the MPL, indicate your
|
|---|
| 31 | * decision by deleting the provisions above and replace them with the notice
|
|---|
| 32 | * and other provisions required by the GPL or the LGPL. If you do not delete
|
|---|
| 33 | * the provisions above, a recipient may use your version of this file under
|
|---|
| 34 | * the terms of any one of the MPL, the GPL or the LGPL.
|
|---|
| 35 | *
|
|---|
| 36 | * ***** END LICENSE BLOCK ***** */
|
|---|
| 37 |
|
|---|
| 38 | /*
|
|---|
| 39 | *----------------------------------------------------------------------
|
|---|
| 40 | *
|
|---|
| 41 | * prtime.h --
|
|---|
| 42 | *
|
|---|
| 43 | * NSPR date and time functions
|
|---|
| 44 | *
|
|---|
| 45 | *-----------------------------------------------------------------------
|
|---|
| 46 | */
|
|---|
| 47 |
|
|---|
| 48 | #ifndef prtime_h___
|
|---|
| 49 | #define prtime_h___
|
|---|
| 50 |
|
|---|
| 51 | #include "prlong.h"
|
|---|
| 52 |
|
|---|
| 53 | #ifdef VBOX_WITH_XPCOM_NAMESPACE_CLEANUP
|
|---|
| 54 | #define PR_Now VBoxNsprPR_Now
|
|---|
| 55 | #define PR_ExplodeTime VBoxNsprPR_ExplodeTime
|
|---|
| 56 | #define PR_ImplodeTime VBoxNsprPR_ImplodeTime
|
|---|
| 57 | #define PR_NormalizeTime VBoxNsprPR_NormalizeTime
|
|---|
| 58 | #endif /* VBOX_WITH_XPCOM_NAMESPACE_CLEANUP */
|
|---|
| 59 |
|
|---|
| 60 | PR_BEGIN_EXTERN_C
|
|---|
| 61 |
|
|---|
| 62 | /**********************************************************************/
|
|---|
| 63 | /************************* TYPES AND CONSTANTS ************************/
|
|---|
| 64 | /**********************************************************************/
|
|---|
| 65 |
|
|---|
| 66 | #define PR_MSEC_PER_SEC 1000UL
|
|---|
| 67 | #define PR_USEC_PER_SEC 1000000UL
|
|---|
| 68 | #define PR_NSEC_PER_SEC 1000000000UL
|
|---|
| 69 | #define PR_USEC_PER_MSEC 1000UL
|
|---|
| 70 | #define PR_NSEC_PER_MSEC 1000000UL
|
|---|
| 71 |
|
|---|
| 72 | /*
|
|---|
| 73 | * PRTime --
|
|---|
| 74 | *
|
|---|
| 75 | * NSPR represents basic time as 64-bit signed integers relative
|
|---|
| 76 | * to midnight (00:00:00), January 1, 1970 Greenwich Mean Time (GMT).
|
|---|
| 77 | * (GMT is also known as Coordinated Universal Time, UTC.)
|
|---|
| 78 | * The units of time are in microseconds. Negative times are allowed
|
|---|
| 79 | * to represent times prior to the January 1970 epoch. Such values are
|
|---|
| 80 | * intended to be exported to other systems or converted to human
|
|---|
| 81 | * readable form.
|
|---|
| 82 | *
|
|---|
| 83 | * Notes on porting: PRTime corresponds to time_t in ANSI C. NSPR 1.0
|
|---|
| 84 | * simply uses PRInt64.
|
|---|
| 85 | */
|
|---|
| 86 |
|
|---|
| 87 | typedef PRInt64 PRTime;
|
|---|
| 88 |
|
|---|
| 89 | /*
|
|---|
| 90 | * Time zone and daylight saving time corrections applied to GMT to
|
|---|
| 91 | * obtain the local time of some geographic location
|
|---|
| 92 | */
|
|---|
| 93 |
|
|---|
| 94 | typedef struct PRTimeParameters {
|
|---|
| 95 | PRInt32 tp_gmt_offset; /* the offset from GMT in seconds */
|
|---|
| 96 | PRInt32 tp_dst_offset; /* contribution of DST in seconds */
|
|---|
| 97 | } PRTimeParameters;
|
|---|
| 98 |
|
|---|
| 99 | /*
|
|---|
| 100 | * PRExplodedTime --
|
|---|
| 101 | *
|
|---|
| 102 | * Time broken down into human-readable components such as year, month,
|
|---|
| 103 | * day, hour, minute, second, and microsecond. Time zone and daylight
|
|---|
| 104 | * saving time corrections may be applied. If they are applied, the
|
|---|
| 105 | * offsets from the GMT must be saved in the 'tm_params' field so that
|
|---|
| 106 | * all the information is available to reconstruct GMT.
|
|---|
| 107 | *
|
|---|
| 108 | * Notes on porting: PRExplodedTime corrresponds to struct tm in
|
|---|
| 109 | * ANSI C, with the following differences:
|
|---|
| 110 | * - an additional field tm_usec;
|
|---|
| 111 | * - replacing tm_isdst by tm_params;
|
|---|
| 112 | * - the month field is spelled tm_month, not tm_mon;
|
|---|
| 113 | * - we use absolute year, AD, not the year since 1900.
|
|---|
| 114 | * The corresponding type in NSPR 1.0 is called PRTime. Below is
|
|---|
| 115 | * a table of date/time type correspondence in the three APIs:
|
|---|
| 116 | * API time since epoch time in components
|
|---|
| 117 | * ANSI C time_t struct tm
|
|---|
| 118 | * NSPR 1.0 PRInt64 PRTime
|
|---|
| 119 | * NSPR 2.0 PRTime PRExplodedTime
|
|---|
| 120 | */
|
|---|
| 121 |
|
|---|
| 122 | typedef struct PRExplodedTime {
|
|---|
| 123 | PRInt32 tm_usec; /* microseconds past tm_sec (0-99999) */
|
|---|
| 124 | PRInt32 tm_sec; /* seconds past tm_min (0-61, accomodating
|
|---|
| 125 | up to two leap seconds) */
|
|---|
| 126 | PRInt32 tm_min; /* minutes past tm_hour (0-59) */
|
|---|
| 127 | PRInt32 tm_hour; /* hours past tm_day (0-23) */
|
|---|
| 128 | PRInt32 tm_mday; /* days past tm_mon (1-31, note that it
|
|---|
| 129 | starts from 1) */
|
|---|
| 130 | PRInt32 tm_month; /* months past tm_year (0-11, Jan = 0) */
|
|---|
| 131 | PRInt16 tm_year; /* absolute year, AD (note that we do not
|
|---|
| 132 | count from 1900) */
|
|---|
| 133 |
|
|---|
| 134 | PRInt8 tm_wday; /* calculated day of the week
|
|---|
| 135 | (0-6, Sun = 0) */
|
|---|
| 136 | PRInt16 tm_yday; /* calculated day of the year
|
|---|
| 137 | (0-365, Jan 1 = 0) */
|
|---|
| 138 |
|
|---|
| 139 | PRTimeParameters tm_params; /* time parameters used by conversion */
|
|---|
| 140 | } PRExplodedTime;
|
|---|
| 141 |
|
|---|
| 142 | /*
|
|---|
| 143 | * PRTimeParamFn --
|
|---|
| 144 | *
|
|---|
| 145 | * A function of PRTimeParamFn type returns the time zone and
|
|---|
| 146 | * daylight saving time corrections for some geographic location,
|
|---|
| 147 | * given the current time in GMT. The input argument gmt should
|
|---|
| 148 | * point to a PRExplodedTime that is in GMT, i.e., whose
|
|---|
| 149 | * tm_params contains all 0's.
|
|---|
| 150 | *
|
|---|
| 151 | * For any time zone other than GMT, the computation is intended to
|
|---|
| 152 | * consist of two steps:
|
|---|
| 153 | * - Figure out the time zone correction, tp_gmt_offset. This number
|
|---|
| 154 | * usually depends on the geographic location only. But it may
|
|---|
| 155 | * also depend on the current time. For example, all of China
|
|---|
| 156 | * is one time zone right now. But this situation may change
|
|---|
| 157 | * in the future.
|
|---|
| 158 | * - Figure out the daylight saving time correction, tp_dst_offset.
|
|---|
| 159 | * This number depends on both the geographic location and the
|
|---|
| 160 | * current time. Most of the DST rules are expressed in local
|
|---|
| 161 | * current time. If so, one should apply the time zone correction
|
|---|
| 162 | * to GMT before applying the DST rules.
|
|---|
| 163 | */
|
|---|
| 164 |
|
|---|
| 165 | typedef PRTimeParameters (PR_CALLBACK *PRTimeParamFn)(const PRExplodedTime *gmt);
|
|---|
| 166 |
|
|---|
| 167 | /**********************************************************************/
|
|---|
| 168 | /****************************** FUNCTIONS *****************************/
|
|---|
| 169 | /**********************************************************************/
|
|---|
| 170 |
|
|---|
| 171 | /*
|
|---|
| 172 | * The PR_Now routine returns the current time relative to the
|
|---|
| 173 | * epoch, midnight, January 1, 1970 UTC. The units of the returned
|
|---|
| 174 | * value are microseconds since the epoch.
|
|---|
| 175 | *
|
|---|
| 176 | * The values returned are not guaranteed to advance in a linear fashion
|
|---|
| 177 | * due to the application of time correction protocols which synchronize
|
|---|
| 178 | * computer clocks to some external time source. Consequently it should
|
|---|
| 179 | * not be depended on for interval timing.
|
|---|
| 180 | *
|
|---|
| 181 | * The implementation is machine dependent.
|
|---|
| 182 | * Cf. time_t time(time_t *tp) in ANSI C.
|
|---|
| 183 | */
|
|---|
| 184 | #if defined(HAVE_WATCOM_BUG_2)
|
|---|
| 185 | PRTime __pascal __export __loadds
|
|---|
| 186 | #else
|
|---|
| 187 | NSPR_API(PRTime)
|
|---|
| 188 | #endif
|
|---|
| 189 | PR_Now(void);
|
|---|
| 190 |
|
|---|
| 191 | /*
|
|---|
| 192 | * Expand time binding it to time parameters provided by PRTimeParamFn.
|
|---|
| 193 | * The calculation is envisoned to proceed in the following steps:
|
|---|
| 194 | * - From given PRTime, calculate PRExplodedTime in GMT
|
|---|
| 195 | * - Apply the given PRTimeParamFn to the GMT that we just calculated
|
|---|
| 196 | * to obtain PRTimeParameters.
|
|---|
| 197 | * - Add the PRTimeParameters offsets to GMT to get the local time
|
|---|
| 198 | * as PRExplodedTime.
|
|---|
| 199 | */
|
|---|
| 200 |
|
|---|
| 201 | NSPR_API(void) PR_ExplodeTime(
|
|---|
| 202 | PRTime usecs, PRTimeParamFn params, PRExplodedTime *exploded);
|
|---|
| 203 |
|
|---|
| 204 | /* Reverse operation of PR_ExplodeTime */
|
|---|
| 205 | #if defined(HAVE_WATCOM_BUG_2)
|
|---|
| 206 | PRTime __pascal __export __loadds
|
|---|
| 207 | #else
|
|---|
| 208 | NSPR_API(PRTime)
|
|---|
| 209 | #endif
|
|---|
| 210 | PR_ImplodeTime(const PRExplodedTime *exploded);
|
|---|
| 211 |
|
|---|
| 212 | /*
|
|---|
| 213 | * Adjust exploded time to normalize field overflows after manipulation.
|
|---|
| 214 | * Note that the following fields of PRExplodedTime should not be
|
|---|
| 215 | * manipulated:
|
|---|
| 216 | * - tm_month and tm_year: because the number of days in a month and
|
|---|
| 217 | * number of days in a year are not constant, it is ambiguous to
|
|---|
| 218 | * manipulate the month and year fields, although one may be tempted
|
|---|
| 219 | * to. For example, what does "a month from January 31st" mean?
|
|---|
| 220 | * - tm_wday and tm_yday: these fields are calculated by NSPR. Users
|
|---|
| 221 | * should treat them as "read-only".
|
|---|
| 222 | */
|
|---|
| 223 |
|
|---|
| 224 | NSPR_API(void) PR_NormalizeTime(
|
|---|
| 225 | PRExplodedTime *exploded, PRTimeParamFn params);
|
|---|
| 226 |
|
|---|
| 227 | PR_END_EXTERN_C
|
|---|
| 228 |
|
|---|
| 229 | #endif /* prtime_h___ */
|
|---|
