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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 "strings"
// IsAbs returns true if the path is absolute.
func IsAbs(path string) (b bool) {
v := VolumeName(path)
if v == "" {
return false
}
path = path[len(v):]
if path == "" {
return false
}
return path[0] == '/' || path[0] == '\\'
}
// VolumeName returns leading volume name.
// Given "C:\foo\bar" it returns "C:" under windows.
// On other platforms it returns "".
func VolumeName(path string) (v string) {
if len(path) < 2 {
return ""
}
// with drive letter
c := path[0]
if path[1] == ':' &&
('0' <= c && c <= '9' || 'a' <= c && c <= 'z' ||
'A' <= c && c <= 'Z') {
return path[:2]
}
return ""
}
// HasPrefix tests whether the path p begins with prefix.
// It ignores case while comparing.
func HasPrefix(p, prefix string) bool {
if strings.HasPrefix(p, prefix) {
return true
}
return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix))
}
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