diff options
Diffstat (limited to 'src/pkg/time/zoneinfo_windows.go')
-rw-r--r-- | src/pkg/time/zoneinfo_windows.go | 270 |
1 files changed, 0 insertions, 270 deletions
diff --git a/src/pkg/time/zoneinfo_windows.go b/src/pkg/time/zoneinfo_windows.go deleted file mode 100644 index 6046743e6..000000000 --- a/src/pkg/time/zoneinfo_windows.go +++ /dev/null @@ -1,270 +0,0 @@ -// Copyright 2009 The Go Authors. All rights reserved. -// Use of this source code is governed by a BSD-style -// license that can be found in the LICENSE file. - -package time - -import ( - "errors" - "runtime" - "syscall" - "unsafe" -) - -// TODO(rsc): Fall back to copy of zoneinfo files. - -// BUG(brainman,rsc): On Windows, the operating system does not provide complete -// time zone information. -// The implementation assumes that this year's rules for daylight savings -// time apply to all previous and future years as well. - -// getKeyValue retrieves the string value kname associated with the open registry key kh. -func getKeyValue(kh syscall.Handle, kname string) (string, error) { - var buf [50]uint16 // buf needs to be large enough to fit zone descriptions - var typ uint32 - n := uint32(len(buf) * 2) // RegQueryValueEx's signature expects array of bytes, not uint16 - p, _ := syscall.UTF16PtrFromString(kname) - if err := syscall.RegQueryValueEx(kh, p, nil, &typ, (*byte)(unsafe.Pointer(&buf[0])), &n); err != nil { - return "", err - } - if typ != syscall.REG_SZ { // null terminated strings only - return "", errors.New("Key is not string") - } - return syscall.UTF16ToString(buf[:]), nil -} - -// matchZoneKey checks if stdname and dstname match the corresponding "Std" -// and "Dlt" key values in the kname key stored under the open registry key zones. -func matchZoneKey(zones syscall.Handle, kname string, stdname, dstname string) (matched bool, err2 error) { - var h syscall.Handle - p, _ := syscall.UTF16PtrFromString(kname) - if err := syscall.RegOpenKeyEx(zones, p, 0, syscall.KEY_READ, &h); err != nil { - return false, err - } - defer syscall.RegCloseKey(h) - - s, err := getKeyValue(h, "Std") - if err != nil { - return false, err - } - if s != stdname { - return false, nil - } - s, err = getKeyValue(h, "Dlt") - if err != nil { - return false, err - } - if s != dstname && dstname != stdname { - return false, nil - } - return true, nil -} - -// toEnglishName searches the registry for an English name of a time zone -// whose zone names are stdname and dstname and returns the English name. -func toEnglishName(stdname, dstname string) (string, error) { - var zones syscall.Handle - p, _ := syscall.UTF16PtrFromString(`SOFTWARE\Microsoft\Windows NT\CurrentVersion\Time Zones`) - if err := syscall.RegOpenKeyEx(syscall.HKEY_LOCAL_MACHINE, p, 0, syscall.KEY_READ, &zones); err != nil { - return "", err - } - defer syscall.RegCloseKey(zones) - - var count uint32 - if err := syscall.RegQueryInfoKey(zones, nil, nil, nil, &count, nil, nil, nil, nil, nil, nil, nil); err != nil { - return "", err - } - - var buf [50]uint16 // buf needs to be large enough to fit zone descriptions - for i := uint32(0); i < count; i++ { - n := uint32(len(buf)) - if syscall.RegEnumKeyEx(zones, i, &buf[0], &n, nil, nil, nil, nil) != nil { - continue - } - kname := syscall.UTF16ToString(buf[:]) - matched, err := matchZoneKey(zones, kname, stdname, dstname) - if err == nil && matched { - return kname, nil - } - } - return "", errors.New(`English name for time zone "` + stdname + `" not found in registry`) -} - -// extractCAPS extracts capital letters from description desc. -func extractCAPS(desc string) string { - var short []rune - for _, c := range desc { - if 'A' <= c && c <= 'Z' { - short = append(short, rune(c)) - } - } - return string(short) -} - -// abbrev returns the abbreviations to use for the given zone z. -func abbrev(z *syscall.Timezoneinformation) (std, dst string) { - stdName := syscall.UTF16ToString(z.StandardName[:]) - a, ok := abbrs[stdName] - if !ok { - dstName := syscall.UTF16ToString(z.DaylightName[:]) - // Perhaps stdName is not English. Try to convert it. - englishName, err := toEnglishName(stdName, dstName) - if err == nil { - a, ok = abbrs[englishName] - if ok { - return a.std, a.dst - } - } - // fallback to using capital letters - return extractCAPS(stdName), extractCAPS(dstName) - } - return a.std, a.dst -} - -// pseudoUnix returns the pseudo-Unix time (seconds since Jan 1 1970 *LOCAL TIME*) -// denoted by the system date+time d in the given year. -// It is up to the caller to convert this local time into a UTC-based time. -func pseudoUnix(year int, d *syscall.Systemtime) int64 { - // Windows specifies daylight savings information in "day in month" format: - // d.Month is month number (1-12) - // d.DayOfWeek is appropriate weekday (Sunday=0 to Saturday=6) - // d.Day is week within the month (1 to 5, where 5 is last week of the month) - // d.Hour, d.Minute and d.Second are absolute time - day := 1 - t := Date(year, Month(d.Month), day, int(d.Hour), int(d.Minute), int(d.Second), 0, UTC) - i := int(d.DayOfWeek) - int(t.Weekday()) - if i < 0 { - i += 7 - } - day += i - if week := int(d.Day) - 1; week < 4 { - day += week * 7 - } else { - // "Last" instance of the day. - day += 4 * 7 - if day > daysIn(Month(d.Month), year) { - day -= 7 - } - } - return t.sec + int64(day-1)*secondsPerDay + internalToUnix -} - -func initLocalFromTZI(i *syscall.Timezoneinformation) { - l := &localLoc - - nzone := 1 - if i.StandardDate.Month > 0 { - nzone++ - } - l.zone = make([]zone, nzone) - - stdname, dstname := abbrev(i) - - std := &l.zone[0] - std.name = stdname - if nzone == 1 { - // No daylight savings. - std.offset = -int(i.Bias) * 60 - l.cacheStart = alpha - l.cacheEnd = omega - l.cacheZone = std - l.tx = make([]zoneTrans, 1) - l.tx[0].when = l.cacheStart - l.tx[0].index = 0 - return - } - - // StandardBias must be ignored if StandardDate is not set, - // so this computation is delayed until after the nzone==1 - // return above. - std.offset = -int(i.Bias+i.StandardBias) * 60 - - dst := &l.zone[1] - dst.name = dstname - dst.offset = -int(i.Bias+i.DaylightBias) * 60 - dst.isDST = true - - // Arrange so that d0 is first transition date, d1 second, - // i0 is index of zone after first transition, i1 second. - d0 := &i.StandardDate - d1 := &i.DaylightDate - i0 := 0 - i1 := 1 - if d0.Month > d1.Month { - d0, d1 = d1, d0 - i0, i1 = i1, i0 - } - - // 2 tx per year, 100 years on each side of this year - l.tx = make([]zoneTrans, 400) - - t := Now().UTC() - year := t.Year() - txi := 0 - for y := year - 100; y < year+100; y++ { - tx := &l.tx[txi] - tx.when = pseudoUnix(y, d0) - int64(l.zone[i1].offset) - tx.index = uint8(i0) - txi++ - - tx = &l.tx[txi] - tx.when = pseudoUnix(y, d1) - int64(l.zone[i0].offset) - tx.index = uint8(i1) - txi++ - } -} - -var usPacific = syscall.Timezoneinformation{ - Bias: 8 * 60, - StandardName: [32]uint16{ - 'P', 'a', 'c', 'i', 'f', 'i', 'c', ' ', 'S', 't', 'a', 'n', 'd', 'a', 'r', 'd', ' ', 'T', 'i', 'm', 'e', - }, - StandardDate: syscall.Systemtime{Month: 11, Day: 1, Hour: 2}, - DaylightName: [32]uint16{ - 'P', 'a', 'c', 'i', 'f', 'i', 'c', ' ', 'D', 'a', 'y', 'l', 'i', 'g', 'h', 't', ' ', 'T', 'i', 'm', 'e', - }, - DaylightDate: syscall.Systemtime{Month: 3, Day: 2, Hour: 2}, - DaylightBias: -60, -} - -var aus = syscall.Timezoneinformation{ - Bias: -10 * 60, - StandardName: [32]uint16{ - 'A', 'U', 'S', ' ', 'E', 'a', 's', 't', 'e', 'r', 'n', ' ', 'S', 't', 'a', 'n', 'd', 'a', 'r', 'd', ' ', 'T', 'i', 'm', 'e', - }, - StandardDate: syscall.Systemtime{Month: 4, Day: 1, Hour: 3}, - DaylightName: [32]uint16{ - 'A', 'U', 'S', ' ', 'E', 'a', 's', 't', 'e', 'r', 'n', ' ', 'D', 'a', 'y', 'l', 'i', 'g', 'h', 't', ' ', 'T', 'i', 'm', 'e', - }, - DaylightDate: syscall.Systemtime{Month: 10, Day: 1, Hour: 2}, - DaylightBias: -60, -} - -func initTestingZone() { - initLocalFromTZI(&usPacific) -} - -func initAusTestingZone() { - initLocalFromTZI(&aus) -} - -func initLocal() { - var i syscall.Timezoneinformation - if _, err := syscall.GetTimeZoneInformation(&i); err != nil { - localLoc.name = "UTC" - return - } - initLocalFromTZI(&i) -} - -func loadLocation(name string) (*Location, error) { - if z, err := loadZoneFile(runtime.GOROOT()+`\lib\time\zoneinfo.zip`, name); err == nil { - z.name = name - return z, nil - } - return nil, errors.New("unknown time zone " + name) -} - -func forceZipFileForTesting(zipOnly bool) { - // We only use the zip file anyway. -} |