annotate nspr/pr/include/prtime.h @ 4:b513267f632f tip

Build DBM module
author Andre Heinecke <andre.heinecke@intevation.de>
date Tue, 05 Aug 2014 18:58:03 +0200
parents 1e5118fa0cb1
children
rev   line source
0
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1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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2 /* This Source Code Form is subject to the terms of the Mozilla Public
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3 * License, v. 2.0. If a copy of the MPL was not distributed with this
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4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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5
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6 /*
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7 *----------------------------------------------------------------------
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8 *
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9 * prtime.h --
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10 *
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11 * NSPR date and time functions
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12 *
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13 *-----------------------------------------------------------------------
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14 */
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15
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16 #ifndef prtime_h___
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17 #define prtime_h___
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18
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19 #include "prlong.h"
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20
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21 PR_BEGIN_EXTERN_C
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22
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23 /**********************************************************************/
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24 /************************* TYPES AND CONSTANTS ************************/
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25 /**********************************************************************/
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26
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27 #define PR_MSEC_PER_SEC 1000L
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28 #define PR_USEC_PER_SEC 1000000L
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29 #define PR_NSEC_PER_SEC 1000000000L
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30 #define PR_USEC_PER_MSEC 1000L
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31 #define PR_NSEC_PER_MSEC 1000000L
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32
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33 /*
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34 * PRTime --
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35 *
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36 * NSPR represents basic time as 64-bit signed integers relative
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37 * to midnight (00:00:00), January 1, 1970 Greenwich Mean Time (GMT).
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38 * (GMT is also known as Coordinated Universal Time, UTC.)
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39 * The units of time are in microseconds. Negative times are allowed
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40 * to represent times prior to the January 1970 epoch. Such values are
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41 * intended to be exported to other systems or converted to human
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42 * readable form.
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43 *
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44 * Notes on porting: PRTime corresponds to time_t in ANSI C. NSPR 1.0
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45 * simply uses PRInt64.
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46 */
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47
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48 typedef PRInt64 PRTime;
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49
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50 /*
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51 * Time zone and daylight saving time corrections applied to GMT to
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52 * obtain the local time of some geographic location
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53 */
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54
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55 typedef struct PRTimeParameters {
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56 PRInt32 tp_gmt_offset; /* the offset from GMT in seconds */
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57 PRInt32 tp_dst_offset; /* contribution of DST in seconds */
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58 } PRTimeParameters;
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59
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60 /*
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61 * PRExplodedTime --
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62 *
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63 * Time broken down into human-readable components such as year, month,
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64 * day, hour, minute, second, and microsecond. Time zone and daylight
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65 * saving time corrections may be applied. If they are applied, the
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66 * offsets from the GMT must be saved in the 'tm_params' field so that
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67 * all the information is available to reconstruct GMT.
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68 *
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69 * Notes on porting: PRExplodedTime corrresponds to struct tm in
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70 * ANSI C, with the following differences:
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71 * - an additional field tm_usec;
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72 * - replacing tm_isdst by tm_params;
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73 * - the month field is spelled tm_month, not tm_mon;
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74 * - we use absolute year, AD, not the year since 1900.
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75 * The corresponding type in NSPR 1.0 is called PRTime. Below is
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76 * a table of date/time type correspondence in the three APIs:
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77 * API time since epoch time in components
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78 * ANSI C time_t struct tm
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79 * NSPR 1.0 PRInt64 PRTime
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80 * NSPR 2.0 PRTime PRExplodedTime
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81 */
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82
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83 typedef struct PRExplodedTime {
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84 PRInt32 tm_usec; /* microseconds past tm_sec (0-99999) */
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85 PRInt32 tm_sec; /* seconds past tm_min (0-61, accomodating
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86 up to two leap seconds) */
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87 PRInt32 tm_min; /* minutes past tm_hour (0-59) */
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88 PRInt32 tm_hour; /* hours past tm_day (0-23) */
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89 PRInt32 tm_mday; /* days past tm_mon (1-31, note that it
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90 starts from 1) */
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91 PRInt32 tm_month; /* months past tm_year (0-11, Jan = 0) */
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92 PRInt16 tm_year; /* absolute year, AD (note that we do not
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93 count from 1900) */
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94
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95 PRInt8 tm_wday; /* calculated day of the week
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96 (0-6, Sun = 0) */
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97 PRInt16 tm_yday; /* calculated day of the year
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98 (0-365, Jan 1 = 0) */
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99
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100 PRTimeParameters tm_params; /* time parameters used by conversion */
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101 } PRExplodedTime;
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102
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103 /*
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104 * PRTimeParamFn --
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105 *
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106 * A function of PRTimeParamFn type returns the time zone and
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107 * daylight saving time corrections for some geographic location,
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108 * given the current time in GMT. The input argument gmt should
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109 * point to a PRExplodedTime that is in GMT, i.e., whose
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110 * tm_params contains all 0's.
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111 *
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112 * For any time zone other than GMT, the computation is intended to
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113 * consist of two steps:
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114 * - Figure out the time zone correction, tp_gmt_offset. This number
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115 * usually depends on the geographic location only. But it may
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116 * also depend on the current time. For example, all of China
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117 * is one time zone right now. But this situation may change
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118 * in the future.
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119 * - Figure out the daylight saving time correction, tp_dst_offset.
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120 * This number depends on both the geographic location and the
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121 * current time. Most of the DST rules are expressed in local
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122 * current time. If so, one should apply the time zone correction
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123 * to GMT before applying the DST rules.
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124 */
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125
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126 typedef PRTimeParameters (PR_CALLBACK *PRTimeParamFn)(const PRExplodedTime *gmt);
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127
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128 /**********************************************************************/
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129 /****************************** FUNCTIONS *****************************/
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130 /**********************************************************************/
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131
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132 /*
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133 * The PR_Now routine returns the current time relative to the
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134 * epoch, midnight, January 1, 1970 UTC. The units of the returned
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135 * value are microseconds since the epoch.
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136 *
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137 * The values returned are not guaranteed to advance in a linear fashion
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138 * due to the application of time correction protocols which synchronize
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139 * computer clocks to some external time source. Consequently it should
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140 * not be depended on for interval timing.
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141 *
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142 * The implementation is machine dependent.
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143 * Cf. time_t time(time_t *tp) in ANSI C.
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144 */
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145 NSPR_API(PRTime)
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146 PR_Now(void);
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147
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148 /*
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149 * Expand time binding it to time parameters provided by PRTimeParamFn.
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150 * The calculation is envisoned to proceed in the following steps:
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151 * - From given PRTime, calculate PRExplodedTime in GMT
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152 * - Apply the given PRTimeParamFn to the GMT that we just calculated
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153 * to obtain PRTimeParameters.
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154 * - Add the PRTimeParameters offsets to GMT to get the local time
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155 * as PRExplodedTime.
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156 */
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157
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158 NSPR_API(void) PR_ExplodeTime(
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159 PRTime usecs, PRTimeParamFn params, PRExplodedTime *exploded);
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160
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161 /* Reverse operation of PR_ExplodeTime */
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162 NSPR_API(PRTime)
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163 PR_ImplodeTime(const PRExplodedTime *exploded);
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164
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165 /*
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166 * Adjust exploded time to normalize field overflows after manipulation.
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167 * Note that the following fields of PRExplodedTime should not be
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168 * manipulated:
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169 * - tm_month and tm_year: because the number of days in a month and
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170 * number of days in a year are not constant, it is ambiguous to
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171 * manipulate the month and year fields, although one may be tempted
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172 * to. For example, what does "a month from January 31st" mean?
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173 * - tm_wday and tm_yday: these fields are calculated by NSPR. Users
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174 * should treat them as "read-only".
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175 */
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176
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177 NSPR_API(void) PR_NormalizeTime(
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178 PRExplodedTime *exploded, PRTimeParamFn params);
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179
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180 /**********************************************************************/
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181 /*********************** TIME PARAMETER FUNCTIONS *********************/
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182 /**********************************************************************/
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183
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184 /* Time parameters that suit current host machine */
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185 NSPR_API(PRTimeParameters) PR_LocalTimeParameters(const PRExplodedTime *gmt);
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186
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187 /* Time parameters that represent Greenwich Mean Time */
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188 NSPR_API(PRTimeParameters) PR_GMTParameters(const PRExplodedTime *gmt);
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189
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190 /*
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191 * Time parameters that represent the US Pacific Time Zone, with the
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192 * current daylight saving time rules (for testing only)
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193 */
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194 NSPR_API(PRTimeParameters) PR_USPacificTimeParameters(const PRExplodedTime *gmt);
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195
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196 /*
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197 * This parses a time/date string into a PRExplodedTime
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198 * struct. It populates all fields but it can't split
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199 * the offset from UTC into tp_gmt_offset and tp_dst_offset in
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200 * most cases (exceptions: PST/PDT, MST/MDT, CST/CDT, EST/EDT, GMT/BST).
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201 * In those cases tp_gmt_offset will be the sum of these two and
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202 * tp_dst_offset will be 0.
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203 * It returns PR_SUCCESS on success, and PR_FAILURE
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204 * if the time/date string can't be parsed.
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205 *
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206 * Many formats are handled, including:
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207 *
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208 * 14 Apr 89 03:20:12
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209 * 14 Apr 89 03:20 GMT
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210 * Fri, 17 Mar 89 4:01:33
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211 * Fri, 17 Mar 89 4:01 GMT
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212 * Mon Jan 16 16:12 PDT 1989
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213 * Mon Jan 16 16:12 +0130 1989
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214 * 6 May 1992 16:41-JST (Wednesday)
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215 * 22-AUG-1993 10:59:12.82
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216 * 22-AUG-1993 10:59pm
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217 * 22-AUG-1993 12:59am
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218 * 22-AUG-1993 12:59 PM
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219 * Friday, August 04, 1995 3:54 PM
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220 * 06/21/95 04:24:34 PM
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221 * 20/06/95 21:07
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222 * 95-06-08 19:32:48 EDT
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223 *
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224 * If the input string doesn't contain a description of the timezone,
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225 * we consult the `default_to_gmt' to decide whether the string should
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226 * be interpreted relative to the local time zone (PR_FALSE) or GMT (PR_TRUE).
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227 * The correct value for this argument depends on what standard specified
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228 * the time string which you are parsing.
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229 */
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230
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231 NSPR_API(PRStatus) PR_ParseTimeStringToExplodedTime (
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232 const char *string,
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233 PRBool default_to_gmt,
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234 PRExplodedTime *result);
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235
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236 /*
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237 * This uses PR_ParseTimeStringToExplodedTime to parse
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238 * a time/date string and PR_ImplodeTime to transform it into
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239 * a PRTime (microseconds after "1-Jan-1970 00:00:00 GMT").
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240 * It returns PR_SUCCESS on success, and PR_FAILURE
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241 * if the time/date string can't be parsed.
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242 */
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243
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244 NSPR_API(PRStatus) PR_ParseTimeString (
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245 const char *string,
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246 PRBool default_to_gmt,
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247 PRTime *result);
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248
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249 /* Format a time value into a buffer. Same semantics as strftime() */
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250 NSPR_API(PRUint32) PR_FormatTime(char *buf, int buflen, const char *fmt,
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251 const PRExplodedTime *tm);
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252
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253 /* Format a time value into a buffer. Time is always in US English format, regardless
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254 * of locale setting.
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255 */
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256 NSPR_API(PRUint32)
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257 PR_FormatTimeUSEnglish( char* buf, PRUint32 bufSize,
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258 const char* format, const PRExplodedTime* tm );
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259
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260 PR_END_EXTERN_C
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
261
1e5118fa0cb1 This is NSS with a Cmake Buildsyste
Andre Heinecke <andre.heinecke@intevation.de>
parents:
diff changeset
262 #endif /* prtime_h___ */
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