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locale_windows.go
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locale_windows.go
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//go:build windows
package main
import (
"syscall"
"unsafe"
"golang.org/x/sys/windows"
)
// Do the interface allocations only once for common
// Errno values.
const (
errnoERROR_IO_PENDING = 997
)
var (
errERROR_IO_PENDING error = syscall.Errno(errnoERROR_IO_PENDING)
errERROR_EINVAL error = syscall.EINVAL
)
// errnoErr returns common boxed Errno values, to prevent
// allocations at runtime.
func errnoErr(e syscall.Errno) error {
switch e {
case 0:
return errERROR_EINVAL
case errnoERROR_IO_PENDING:
return errERROR_IO_PENDING
}
// TODO: add more here, after collecting data on the common
// error values see on Windows. (perhaps when running
// all.bat?)
return e
}
var (
kernel32 = syscall.NewLazyDLL("kernel32.dll")
pGetUserDefaultLocaleName = kernel32.NewProc("GetUserDefaultLocaleName")
)
func GetUserDefaultLocaleName(buffer *uint16, bufferLen uint32) (uint32, error) {
r0, _, e0 := syscall.SyscallN(pGetUserDefaultLocaleName.Addr(), uintptr(unsafe.Pointer(buffer)), uintptr(bufferLen))
if r0 == 0 {
return 0, errnoErr(e0)
}
return uint32(r0), nil
}
func defaultLocaleName() string {
n := uint32(32)
var err error
for {
buf := make([]uint16, n)
n, err = GetUserDefaultLocaleName(&buf[0], uint32(len(buf)))
if err != nil {
return ""
}
if n <= uint32(len(buf)) {
return windows.UTF16ToString(buf[:n])
}
}
}