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102 lines
2.5 KiB
Go
102 lines
2.5 KiB
Go
// +build windows
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package locale
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import (
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"fmt"
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"unsafe"
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"golang.org/x/sys/windows"
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)
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// LocaleNameMaxLength is the maximum length of a locale name on Windows.
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// See https://docs.microsoft.com/en-us/windows/win32/intl/locale-name-constants.
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const LocaleNameMaxLength uint32 = 85
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func getWindowsLocaleFromProc(syscall string) (string, error) {
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dll, err := windows.LoadDLL("kernel32")
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if err != nil {
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return "", fmt.Errorf("could not find the kernel32 DLL: %v", err)
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}
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proc, err := dll.FindProc(syscall)
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if err != nil {
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return "", fmt.Errorf("could not find the %s proc in kernel32: %v", syscall, err)
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}
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buffer := make([]uint16, LocaleNameMaxLength)
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// See https://docs.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-getuserdefaultlocalename
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// and https://docs.microsoft.com/en-us/windows/win32/api/winnls/nf-winnls-getsystemdefaultlocalename
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// GetUserDefaultLocaleName and GetSystemDefaultLocaleName both take a buffer and a buffer size,
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// and return the length of the locale name (0 if not found).
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ret, _, err := proc.Call(uintptr(unsafe.Pointer(&buffer[0])), uintptr(LocaleNameMaxLength))
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if ret == 0 {
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return "", fmt.Errorf("locale not found when calling %s: %v", syscall, err)
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}
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return windows.UTF16ToString(buffer), nil
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}
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func getWindowsLocale() (string, error) {
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var (
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locale string
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err error
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)
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for _, proc := range [...]string{"GetUserDefaultLocaleName", "GetSystemDefaultLocaleName"} {
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locale, err = getWindowsLocaleFromProc(proc)
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if err == nil {
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return locale, err
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}
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}
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return locale, err
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}
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// GetLocale retrieves the IETF BCP 47 language tag set on the system.
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func GetLocale() (string, error) {
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locale, err := getWindowsLocale()
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if err != nil {
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return "", fmt.Errorf("cannot determine locale: %v", err)
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}
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return locale, err
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}
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// GetLocales retrieves the IETF BCP 47 language tags set on the system.
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func GetLocales() ([]string, error) {
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locale, err := GetLocale()
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if err != nil {
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return nil, err
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}
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return []string{locale}, nil
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}
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// GetLanguage retrieves the IETF BCP 47 language tag set on the system and
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// returns the language part of the tag.
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func GetLanguage() (string, error) {
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language := ""
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locale, err := GetLocale()
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if err == nil {
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language, _ = splitLocale(locale)
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}
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return language, err
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}
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// GetRegion retrieves the IETF BCP 47 language tag set on the system and
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// returns the region part of the tag.
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func GetRegion() (string, error) {
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region := ""
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locale, err := GetLocale()
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if err == nil {
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_, region = splitLocale(locale)
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}
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return region, err
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}
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