| // 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 "" |
| } |