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Odin/core/time/timezone/tz_windows.odin
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Colin Davidson b2d1fbba9c oops, missed a comma
2024-11-05 03:48:47 -08:00

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Odin
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#+build windows
#+private
package timezone
import "core:strings"
import "core:sys/windows"
import "core:time/datetime"
TZ_Abbrev :: struct {
std: string,
dst: string,
}
tz_abbrevs := map[string]TZ_Abbrev {
"Egypt Standard Time" = {"EET", "EEST"}, // Africa/Cairo
"Morocco Standard Time" = {"+00", "+01"}, // Africa/Casablanca
"South Africa Standard Time" = {"SAST", "SAST"}, // Africa/Johannesburg
"South Sudan Standard Time" = {"CAT", "CAT"}, // Africa/Juba
"Sudan Standard Time" = {"CAT", "CAT"}, // Africa/Khartoum
"W. Central Africa Standard Time" = {"WAT", "WAT"}, // Africa/Lagos
"E. Africa Standard Time" = {"EAT", "EAT"}, // Africa/Nairobi
"Sao Tome Standard Time" = {"GMT", "GMT"}, // Africa/Sao_Tome
"Libya Standard Time" = {"EET", "EET"}, // Africa/Tripoli
"Namibia Standard Time" = {"CAT", "CAT"}, // Africa/Windhoek
"Aleutian Standard Time" = {"HST", "HDT"}, // America/Adak
"Alaskan Standard Time" = {"AKST", "AKDT"}, // America/Anchorage
"Tocantins Standard Time" = {"-03", "-03"}, // America/Araguaina
"Paraguay Standard Time" = {"-04", "-03"}, // America/Asuncion
"Bahia Standard Time" = {"-03", "-03"}, // America/Bahia
"SA Pacific Standard Time" = {"-05", "-05"}, // America/Bogota
"Argentina Standard Time" = {"-03", "-03"}, // America/Buenos_Aires
"Eastern Standard Time (Mexico)" = {"EST", "EST"}, // America/Cancun
"Venezuela Standard Time" = {"-04", "-04"}, // America/Caracas
"SA Eastern Standard Time" = {"-03", "-03"}, // America/Cayenne
"Central Standard Time" = {"CST", "CDT"}, // America/Chicago
"Central Brazilian Standard Time" = {"-04", "-04"}, // America/Cuiaba
"Mountain Standard Time" = {"MST", "MDT"}, // America/Denver
"Greenland Standard Time" = {"-03", "-02"}, // America/Godthab
"Turks And Caicos Standard Time" = {"EST", "EDT"}, // America/Grand_Turk
"Central America Standard Time" = {"CST", "CST"}, // America/Guatemala
"Atlantic Standard Time" = {"AST", "ADT"}, // America/Halifax
"Cuba Standard Time" = {"CST", "CDT"}, // America/Havana
"US Eastern Standard Time" = {"EST", "EDT"}, // America/Indianapolis
"SA Western Standard Time" = {"-04", "-04"}, // America/La_Paz
"Pacific Standard Time" = {"PST", "PDT"}, // America/Los_Angeles
"Mountain Standard Time (Mexico)" = {"MST", "MST"}, // America/Mazatlan
"Central Standard Time (Mexico)" = {"CST", "CST"}, // America/Mexico_City
"Saint Pierre Standard Time" = {"-03", "-02"}, // America/Miquelon
"Montevideo Standard Time" = {"-03", "-03"}, // America/Montevideo
"Eastern Standard Time" = {"EST", "EDT"}, // America/New_York
"US Mountain Standard Time" = {"MST", "MST"}, // America/Phoenix
"Haiti Standard Time" = {"EST", "EDT"}, // America/Port-au-Prince
"Magallanes Standard Time" = {"-03", "-03"}, // America/Punta_Arenas
"Canada Central Standard Time" = {"CST", "CST"}, // America/Regina
"Pacific SA Standard Time" = {"-04", "-03"}, // America/Santiago
"E. South America Standard Time" = {"-03", "-03"}, // America/Sao_Paulo
"Newfoundland Standard Time" = {"NST", "NDT"}, // America/St_Johns
"Pacific Standard Time (Mexico)" = {"PST", "PDT"}, // America/Tijuana
"Yukon Standard Time" = {"MST", "MST"}, // America/Whitehorse
"Central Asia Standard Time" = {"+06", "+06"}, // Asia/Almaty
"Jordan Standard Time" = {"+03", "+03"}, // Asia/Amman
"Arabic Standard Time" = {"+03", "+03"}, // Asia/Baghdad
"Azerbaijan Standard Time" = {"+04", "+04"}, // Asia/Baku
"SE Asia Standard Time" = {"+07", "+07"}, // Asia/Bangkok
"Altai Standard Time" = {"+07", "+07"}, // Asia/Barnaul
"Middle East Standard Time" = {"EET", "EEST"}, // Asia/Beirut
"India Standard Time" = {"IST", "IST"}, // Asia/Calcutta
"Transbaikal Standard Time" = {"+09", "+09"}, // Asia/Chita
"Sri Lanka Standard Time" = {"+0530", "+0530"}, // Asia/Colombo
"Syria Standard Time" = {"+03", "+03"}, // Asia/Damascus
"Bangladesh Standard Time" = {"+06", "+06"}, // Asia/Dhaka
"Arabian Standard Time" = {"+04", "+04"}, // Asia/Dubai
"West Bank Standard Time" = {"EET", "EEST"}, // Asia/Hebron
"W. Mongolia Standard Time" = {"+07", "+07"}, // Asia/Hovd
"North Asia East Standard Time" = {"+08", "+08"}, // Asia/Irkutsk
"Israel Standard Time" = {"IST", "IDT"}, // Asia/Jerusalem
"Afghanistan Standard Time" = {"+0430", "+0430"}, // Asia/Kabul
"Russia Time Zone 11" = {"+12", "+12"}, // Asia/Kamchatka
"Pakistan Standard Time" = {"PKT", "PKT"}, // Asia/Karachi
"Nepal Standard Time" = {"+0545", "+0545"}, // Asia/Katmandu
"North Asia Standard Time" = {"+07", "+07"}, // Asia/Krasnoyarsk
"Magadan Standard Time" = {"+11", "+11"}, // Asia/Magadan
"N. Central Asia Standard Time" = {"+07", "+07"}, // Asia/Novosibirsk
"Omsk Standard Time" = {"+06", "+06"}, // Asia/Omsk
"North Korea Standard Time" = {"KST", "KST"}, // Asia/Pyongyang
"Qyzylorda Standard Time" = {"+05", "+05"}, // Asia/Qyzylorda
"Myanmar Standard Time" = {"+0630", "+0630"}, // Asia/Rangoon
"Arab Standard Time" = {"+03", "+03"}, // Asia/Riyadh
"Sakhalin Standard Time" = {"+11", "+11"}, // Asia/Sakhalin
"Korea Standard Time" = {"KST", "KST"}, // Asia/Seoul
"China Standard Time" = {"CST", "CST"}, // Asia/Shanghai
"Singapore Standard Time" = {"+08", "+08"}, // Asia/Singapore
"Russia Time Zone 10" = {"+11", "+11"}, // Asia/Srednekolymsk
"Taipei Standard Time" = {"CST", "CST"}, // Asia/Taipei
"West Asia Standard Time" = {"+05", "+05"}, // Asia/Tashkent
"Georgian Standard Time" = {"+04", "+04"}, // Asia/Tbilisi
"Iran Standard Time" = {"+0330", "+0330"}, // Asia/Tehran
"Tokyo Standard Time" = {"JST", "JST"}, // Asia/Tokyo
"Tomsk Standard Time" = {"+07", "+07"}, // Asia/Tomsk
"Ulaanbaatar Standard Time" = {"+08", "+08"}, // Asia/Ulaanbaatar
"Vladivostok Standard Time" = {"+10", "+10"}, // Asia/Vladivostok
"Yakutsk Standard Time" = {"+09", "+09"}, // Asia/Yakutsk
"Ekaterinburg Standard Time" = {"+05", "+05"}, // Asia/Yekaterinburg
"Caucasus Standard Time" = {"+04", "+04"}, // Asia/Yerevan
"Azores Standard Time" = {"-01", "+00"}, // Atlantic/Azores
"Cape Verde Standard Time" = {"-01", "-01"}, // Atlantic/Cape_Verde
"Greenwich Standard Time" = {"GMT", "GMT"}, // Atlantic/Reykjavik
"Cen. Australia Standard Time" = {"ACST", "ACDT"}, // Australia/Adelaide
"E. Australia Standard Time" = {"AEST", "AEST"}, // Australia/Brisbane
"AUS Central Standard Time" = {"ACST", "ACST"}, // Australia/Darwin
"Aus Central W. Standard Time" = {"+0845", "+0845"}, // Australia/Eucla
"Tasmania Standard Time" = {"AEST", "AEDT"}, // Australia/Hobart
"Lord Howe Standard Time" = {"+1030", "+11"}, // Australia/Lord_Howe
"W. Australia Standard Time" = {"AWST", "AWST"}, // Australia/Perth
"AUS Eastern Standard Time" = {"AEST", "AEDT"}, // Australia/Sydney
"UTC-11" = {"-11", "-11"}, // Etc/GMT+11
"Dateline Standard Time" = {"-12", "-12"}, // Etc/GMT+12
"UTC-02" = {"-02", "-02"}, // Etc/GMT+2
"UTC-08" = {"-08", "-08"}, // Etc/GMT+8
"UTC-09" = {"-09", "-09"}, // Etc/GMT+9
"UTC+12" = {"+12", "+12"}, // Etc/GMT-12
"UTC+13" = {"+13", "+13"}, // Etc/GMT-13
"UTC" = {"UTC", "UTC"}, // Etc/UTC
"Astrakhan Standard Time" = {"+04", "+04"}, // Europe/Astrakhan
"W. Europe Standard Time" = {"CET", "CEST"}, // Europe/Berlin
"GTB Standard Time" = {"EET", "EEST"}, // Europe/Bucharest
"Central Europe Standard Time" = {"CET", "CEST"}, // Europe/Budapest
"E. Europe Standard Time" = {"EET", "EEST"}, // Europe/Chisinau
"Turkey Standard Time" = {"+03", "+03"}, // Europe/Istanbul
"Kaliningrad Standard Time" = {"EET", "EET"}, // Europe/Kaliningrad
"FLE Standard Time" = {"EET", "EEST"}, // Europe/Kiev
"GMT Standard Time" = {"GMT", "BST"}, // Europe/London
"Belarus Standard Time" = {"+03", "+03"}, // Europe/Minsk
"Russian Standard Time" = {"MSK", "MSK"}, // Europe/Moscow
"Romance Standard Time" = {"CET", "CEST"}, // Europe/Paris
"Russia Time Zone 3" = {"+04", "+04"}, // Europe/Samara
"Saratov Standard Time" = {"+04", "+04"}, // Europe/Saratov
"Volgograd Standard Time" = {"MSK", "MSK"}, // Europe/Volgograd
"Central European Standard Time" = {"CET", "CEST"}, // Europe/Warsaw
"Mauritius Standard Time" = {"+04", "+04"}, // Indian/Mauritius
"Samoa Standard Time" = {"+13", "+13"}, // Pacific/Apia
"New Zealand Standard Time" = {"NZST", "NZDT"}, // Pacific/Auckland
"Bougainville Standard Time" = {"+11", "+11"}, // Pacific/Bougainville
"Chatham Islands Standard Time" = {"+1245", "+1345"}, // Pacific/Chatham
"Easter Island Standard Time" = {"-06", "-05"}, // Pacific/Easter
"Fiji Standard Time" = {"+12", "+12"}, // Pacific/Fiji
"Central Pacific Standard Time" = {"+11", "+11"}, // Pacific/Guadalcanal
"Hawaiian Standard Time" = {"HST", "HST"}, // Pacific/Honolulu
"Line Islands Standard Time" = {"+14", "+14"}, // Pacific/Kiritimati
"Marquesas Standard Time" = {"-0930", "-0930"}, // Pacific/Marquesas
"Norfolk Standard Time" = {"+11", "+12"}, // Pacific/Norfolk
"West Pacific Standard Time" = {"+10", "+10"}, // Pacific/Port_Moresby
"Tonga Standard Time" = {"+13", "+13"}, // Pacific/Tongatapu
}
iana_to_windows_tz :: proc(iana_name: string, allocator := context.allocator) -> (name: string, success: bool) {
wintz_name_buffer: [128]u16
status: windows.UError
iana_name_wstr := windows.utf8_to_wstring(iana_name, allocator)
defer free(iana_name_wstr, allocator)
wintz_name_len := windows.ucal_getWindowsTimeZoneID(iana_name_wstr, -1, raw_data(wintz_name_buffer[:]), len(wintz_name_buffer), &status)
if status != .U_ZERO_ERROR {
return
}
wintz_name, err := windows.utf16_to_utf8(wintz_name_buffer[:wintz_name_len], allocator)
if err != nil {
return
}
return wintz_name, true
}
local_tz_name :: proc(allocator := context.allocator) -> (name: string, success: bool) {
iana_name_buffer: [128]u16
status: windows.UError
zone_str_len := windows.ucal_getDefaultTimeZone(raw_data(iana_name_buffer[:]), len(iana_name_buffer), &status)
if status != .U_ZERO_ERROR {
return
}
iana_name, err := windows.utf16_to_utf8(iana_name_buffer[:zone_str_len], allocator)
if err != nil {
return
}
return iana_name, true
}
REG_TZI_FORMAT :: struct #packed {
bias: windows.LONG,
std_bias: windows.LONG,
dst_bias: windows.LONG,
std_date: windows.SYSTEMTIME,
dst_date: windows.SYSTEMTIME,
}
generate_rrule_from_tzi :: proc(tzi: ^REG_TZI_FORMAT, abbrevs: TZ_Abbrev, allocator := context.allocator) -> (rrule: datetime.TZ_RRule, ok: bool) {
std_name, err := strings.clone(abbrevs.std, allocator)
if err != nil { return }
defer if err != nil { delete(std_name, allocator) }
if (tzi.std_date.month == 0) {
return datetime.TZ_RRule{
has_dst = false,
std_name = std_name,
std_offset = -(i64(tzi.bias) + i64(tzi.std_bias)) * 60,
dst_date = datetime.TZ_Transition_Date{
type = .Month_Week_Day,
month = u8(tzi.std_date.month),
week = u8(tzi.std_date.day),
day = tzi.std_date.day_of_week,
time = (i64(tzi.std_date.hour) * 60 * 60) + (i64(tzi.std_date.minute) * 60) + i64(tzi.std_date.second),
},
}, true
}
dst_name: string
dst_name, err = strings.clone(abbrevs.dst, allocator)
if err != nil { return }
defer if err != nil { delete(dst_name, allocator) }
return datetime.TZ_RRule{
has_dst = true,
std_name = std_name,
std_offset = -(i64(tzi.bias) + i64(tzi.std_bias)) * 60,
dst_date = datetime.TZ_Transition_Date{
type = .Month_Week_Day,
month = u8(tzi.std_date.month),
week = u8(tzi.std_date.day),
day = tzi.std_date.day_of_week,
time = (i64(tzi.std_date.hour) * 60 * 60) + (i64(tzi.std_date.minute) * 60) + i64(tzi.std_date.second),
},
dst_name = dst_name,
dst_offset = -(i64(tzi.bias) + i64(tzi.dst_bias)) * 60,
std_date = datetime.TZ_Transition_Date{
type = .Month_Week_Day,
month = u8(tzi.dst_date.month),
week = u8(tzi.dst_date.day),
day = tzi.dst_date.day_of_week,
time = (i64(tzi.dst_date.hour) * 60 * 60) + (i64(tzi.dst_date.minute) * 60) + i64(tzi.dst_date.second),
},
}, true
}
_region_load :: proc(reg_str: string, allocator := context.allocator) -> (out_reg: ^datetime.TZ_Region, success: bool) {
wintz_name: string
iana_name: string
if reg_str == "local" {
ok := false
iana_name = local_tz_name(allocator) or_return
wintz_name, ok = iana_to_windows_tz(iana_name, allocator)
if !ok {
delete(iana_name, allocator)
return
}
} else {
wintz_name = iana_to_windows_tz(reg_str, allocator) or_return
iana_name = strings.clone(reg_str, allocator)
}
defer delete(wintz_name, allocator)
defer delete(iana_name, allocator)
abbrevs := tz_abbrevs[wintz_name] or_return
if abbrevs.std == "UTC" && abbrevs.dst == abbrevs.std {
return nil, true
}
key_base := `SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones`
tz_key := strings.join({key_base, wintz_name}, "\\", allocator = allocator)
defer delete(tz_key, allocator)
tz_key_wstr := windows.utf8_to_wstring(tz_key, allocator)
defer free(tz_key_wstr, allocator)
key: windows.HKEY
res := windows.RegOpenKeyExW(windows.HKEY_LOCAL_MACHINE, tz_key_wstr, 0, windows.KEY_READ, &key)
if res != 0 { return }
defer windows.RegCloseKey(key)
tzi: REG_TZI_FORMAT
size := u32(size_of(REG_TZI_FORMAT))
res = windows.RegGetValueW(key, nil, windows.L("TZI"), windows.RRF_RT_ANY, nil, &tzi, &size)
if res != 0 {
return
}
rrule := generate_rrule_from_tzi(&tzi, abbrevs, allocator) or_return
region_name, err := strings.clone(iana_name, allocator)
if err != nil { return }
defer if err != nil { delete(region_name, allocator) }
region: ^datetime.TZ_Region
region, err = new_clone(datetime.TZ_Region{
name = region_name,
rrule = rrule,
}, allocator)
if err != nil { return }
return region, true
}
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