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// Copyright 2010 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 filepath
import "os"
// IsAbs returns true if the path is absolute.
func IsAbs(path string) bool {
return path != "" && (volumeName(path) != "" || os.IsPathSeparator(path[0]))
}
// volumeName return leading volume name.
// If given "C:\foo\bar", return "C:" on windows.
func volumeName(path string) string {
if path == "" {
return ""
}
// with drive letter
c := path[0]
if len(path) > 2 && path[1] == ':' && os.IsPathSeparator(path[2]) &&
('0' <= c && c <= '9' || 'a' <= c && c <= 'z' ||
'A' <= c && c <= 'Z') {
return path[0:2]
}
return ""
}
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