1 /* 2 * Copyright 2010-2011, Oliver Tappe, zooey@hirschkaefer.de. 3 * Distributed under the terms of the MIT License. 4 */ 5 6 7 #include "ICUTimeConversion.h" 8 9 #include <math.h> 10 #include <string.h> 11 #include <strings.h> 12 13 #include <unicode/gregocal.h> 14 15 16 U_NAMESPACE_USE 17 18 19 namespace BPrivate { 20 namespace Libroot { 21 22 23 ICUTimeConversion::ICUTimeConversion(const ICUTimeData& timeData) 24 : 25 fTimeData(timeData), 26 fDataBridge(NULL), 27 fTimeZone(NULL) 28 { 29 fTimeZoneID[0] = '\0'; 30 } 31 32 33 ICUTimeConversion::~ICUTimeConversion() 34 { 35 delete fTimeZone; 36 } 37 38 39 void 40 ICUTimeConversion::Initialize(TimeConversionDataBridge* dataBridge) 41 { 42 fDataBridge = dataBridge; 43 } 44 45 46 status_t 47 ICUTimeConversion::TZSet(const char* timeZoneID, const char* tz) 48 { 49 bool offsetHasBeenSet = false; 50 bool timeZoneIdMatches = false; 51 52 // The given TZ environment variable's content overrides the default 53 // system timezone. 54 if (tz != NULL) { 55 // If the value given in the TZ env-var starts with a colon, that 56 // value is implementation specific, we expect a full timezone ID. 57 if (*tz == ':') { 58 // nothing to do if the given name matches the current timezone 59 if (strcasecmp(fTimeZoneID, tz + 1) == 0) { 60 timeZoneIdMatches = true; 61 goto done; 62 } 63 64 strlcpy(fTimeZoneID, tz + 1, sizeof(fTimeZoneID)); 65 } else { 66 // note timezone name 67 strlcpy(fTimeZoneID, tz, sizeof(fTimeZoneID)); 68 69 // nothing to do if the given name matches the current timezone 70 if (strcasecmp(fTimeZoneID, fDataBridge->addrOfTZName[0]) == 0) { 71 timeZoneIdMatches = true; 72 goto done; 73 } 74 75 // parse TZ variable (only <std> and <offset> supported) 76 const char* tzNameEnd = tz; 77 while(isalpha(*tzNameEnd)) 78 ++tzNameEnd; 79 if (*tzNameEnd == '-' || *tzNameEnd == '+') { 80 int hours = 0; 81 int minutes = 0; 82 int seconds = 0; 83 sscanf(tzNameEnd + 1, "%2d:%2d:%2d", &hours, &minutes, 84 &seconds); 85 hours = min_c(24, max_c(0, hours)); 86 minutes = min_c(59, max_c(0, minutes)); 87 seconds = min_c(59, max_c(0, seconds)); 88 89 *fDataBridge->addrOfTimezone = (*tzNameEnd == '-' ? -1 : 1) 90 * (hours * 3600 + minutes * 60 + seconds); 91 offsetHasBeenSet = true; 92 } 93 } 94 } else { 95 // nothing to do if the given name matches the current timezone 96 if (strcasecmp(fTimeZoneID, timeZoneID) == 0) { 97 timeZoneIdMatches = true; 98 goto done; 99 } 100 101 strlcpy(fTimeZoneID, timeZoneID, sizeof(fTimeZoneID)); 102 } 103 104 done: 105 // fTimeZone can still be NULL if we don't initialize it 106 // in the first TZSet, causing problems for future 107 // Localtime invocations. 108 if (fTimeZone != NULL && timeZoneIdMatches) 109 return B_OK; 110 111 delete fTimeZone; 112 fTimeZone = TimeZone::createTimeZone(fTimeZoneID); 113 if (fTimeZone == NULL) 114 return B_NO_MEMORY; 115 116 if (offsetHasBeenSet) { 117 fTimeZone->setRawOffset(*fDataBridge->addrOfTimezone * -1 * 1000); 118 } else { 119 int32_t rawOffset; 120 int32_t dstOffset; 121 UDate nowMillis = 1000 * (UDate)time(NULL); 122 UErrorCode icuStatus = U_ZERO_ERROR; 123 fTimeZone->getOffset(nowMillis, FALSE, rawOffset, dstOffset, icuStatus); 124 if (!U_SUCCESS(icuStatus)) { 125 *fDataBridge->addrOfTimezone = 0; 126 *fDataBridge->addrOfDaylight = false; 127 strcpy(fDataBridge->addrOfTZName[0], "GMT"); 128 strcpy(fDataBridge->addrOfTZName[1], "GMT"); 129 130 return B_ERROR; 131 } 132 *fDataBridge->addrOfTimezone = -1 * (rawOffset + dstOffset) / 1000; 133 // we want seconds, not the ms that ICU gives us 134 } 135 136 *fDataBridge->addrOfDaylight = fTimeZone->useDaylightTime(); 137 138 for (int i = 0; i < 2; ++i) { 139 if (tz != NULL && *tz != ':' && i == 0) { 140 strcpy(fDataBridge->addrOfTZName[0], fTimeZoneID); 141 } else { 142 UnicodeString icuString; 143 fTimeZone->getDisplayName(i == 1, TimeZone::SHORT, 144 fTimeData.ICULocaleForStrings(), icuString); 145 CheckedArrayByteSink byteSink(fDataBridge->addrOfTZName[i], 146 sizeof(fTimeZoneID)); 147 icuString.toUTF8(byteSink); 148 149 // make sure to canonicalize "GMT+00:00" to just "GMT" 150 if (strcmp(fDataBridge->addrOfTZName[i], "GMT+00:00") == 0) 151 fDataBridge->addrOfTZName[i][3] = '\0'; 152 } 153 } 154 155 return B_OK; 156 } 157 158 159 status_t 160 ICUTimeConversion::Localtime(const time_t* inTime, struct tm* tmOut) 161 { 162 if (fTimeZone == NULL) 163 return B_NO_INIT; 164 165 tmOut->tm_zone = fTimeZoneID; 166 return _FillTmValues(fTimeZone, inTime, tmOut); 167 } 168 169 170 status_t 171 ICUTimeConversion::Gmtime(const time_t* inTime, struct tm* tmOut) 172 { 173 const TimeZone* icuTimeZone = TimeZone::getGMT(); 174 // no delete - doesn't belong to us 175 176 return _FillTmValues(icuTimeZone, inTime, tmOut); 177 } 178 179 180 status_t 181 ICUTimeConversion::Mktime(struct tm* inOutTm, time_t& timeOut) 182 { 183 return _Mktime(fTimeZone, inOutTm, timeOut); 184 } 185 186 187 status_t 188 ICUTimeConversion::Timegm(struct tm* inOutTm, time_t& timeOut) 189 { 190 const TimeZone* icuTimeZone = TimeZone::getGMT(); 191 return _Mktime(icuTimeZone, inOutTm, timeOut); 192 } 193 194 195 status_t 196 ICUTimeConversion::_FillTmValues(const TimeZone* icuTimeZone, 197 const time_t* inTime, struct tm* tmOut) 198 { 199 UErrorCode icuStatus = U_ZERO_ERROR; 200 GregorianCalendar calendar(*icuTimeZone, fTimeData.ICULocale(), icuStatus); 201 if (!U_SUCCESS(icuStatus)) 202 return B_ERROR; 203 204 calendar.setTime(1000 * (UDate)*inTime, icuStatus); 205 if (!U_SUCCESS(icuStatus)) 206 return B_ERROR; 207 208 tmOut->tm_sec = calendar.get(UCAL_SECOND, icuStatus); 209 if (!U_SUCCESS(icuStatus)) 210 return B_ERROR; 211 tmOut->tm_min = calendar.get(UCAL_MINUTE, icuStatus); 212 if (!U_SUCCESS(icuStatus)) 213 return B_ERROR; 214 tmOut->tm_hour = calendar.get(UCAL_HOUR_OF_DAY, icuStatus); 215 if (!U_SUCCESS(icuStatus)) 216 return B_ERROR; 217 tmOut->tm_mday = calendar.get(UCAL_DAY_OF_MONTH, icuStatus); 218 if (!U_SUCCESS(icuStatus)) 219 return B_ERROR; 220 tmOut->tm_mon = calendar.get(UCAL_MONTH, icuStatus); 221 if (!U_SUCCESS(icuStatus)) 222 return B_ERROR; 223 tmOut->tm_year = calendar.get(UCAL_YEAR, icuStatus) - 1900; 224 if (!U_SUCCESS(icuStatus)) 225 return B_ERROR; 226 tmOut->tm_wday = calendar.get(UCAL_DAY_OF_WEEK, icuStatus) - 1; 227 if (!U_SUCCESS(icuStatus)) 228 return B_ERROR; 229 tmOut->tm_yday = calendar.get(UCAL_DAY_OF_YEAR, icuStatus) - 1; 230 if (!U_SUCCESS(icuStatus)) 231 return B_ERROR; 232 tmOut->tm_isdst = calendar.inDaylightTime(icuStatus); 233 if (!U_SUCCESS(icuStatus)) 234 return B_ERROR; 235 tmOut->tm_gmtoff = (calendar.get(UCAL_ZONE_OFFSET, icuStatus) 236 + calendar.get(UCAL_DST_OFFSET, icuStatus)) / 1000; 237 if (!U_SUCCESS(icuStatus)) 238 return B_ERROR; 239 tmOut->tm_zone = fDataBridge->addrOfTZName[tmOut->tm_isdst ? 1 : 0]; 240 241 return B_OK; 242 } 243 244 245 status_t 246 ICUTimeConversion::_Mktime(const TimeZone* icuTimeZone, 247 struct tm* inOutTm, time_t& timeOut) 248 { 249 if (icuTimeZone == NULL) 250 return B_NO_INIT; 251 252 UErrorCode icuStatus = U_ZERO_ERROR; 253 GregorianCalendar calendar(*icuTimeZone, fTimeData.ICULocale(), 254 icuStatus); 255 if (!U_SUCCESS(icuStatus)) 256 return B_ERROR; 257 258 calendar.setLenient(TRUE); 259 calendar.set(inOutTm->tm_year + 1900, inOutTm->tm_mon, inOutTm->tm_mday, 260 inOutTm->tm_hour, inOutTm->tm_min, inOutTm->tm_sec); 261 262 UDate timeInMillis = calendar.getTime(icuStatus); 263 if (!U_SUCCESS(icuStatus)) 264 return B_ERROR; 265 timeOut = (time_t)((int64_t)timeInMillis / 1000); 266 267 return _FillTmValues(icuTimeZone, &timeOut, inOutTm); 268 } 269 270 271 } // namespace Libroot 272 } // namespace BPrivate 273