rclone/fs/driveletter/driveletter_windows.go

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// +build windows
package driveletter
// IsDriveLetter returns a bool indicating whether name is a valid
// Windows drive letter
func IsDriveLetter(name string) bool {
if len(name) != 1 {
return false
}
c := name[0]
return (c >= 'a' && c <= 'z') || (c >= 'A' && c <= 'Z')
}