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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"
)
func isSlash(c uint8) bool {
return c == '\\' || c == '/'
}
// 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 isSlash(path[0])
}
// VolumeName returns leading volume name.
// Given "C:\foo\bar" it returns "C:" under windows.
// Given "\\host\share\foo" it returns "\\host\share".
// 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]
}
// is it UNC
if l := len(path); l >= 5 && isSlash(path[0]) && isSlash(path[1]) &&
!isSlash(path[2]) && path[2] != '.' {
// first, leading `\\` and next shouldn't be `\`. its server name.
for n := 3; n < l-1; n++ {
// second, next '\' shouldn't be repeated.
if isSlash(path[n]) {
n++
// third, following something characters. its share name.
if !isSlash(path[n]) {
if path[n] == '.' {
break
}
for ; n < l; n++ {
if isSlash(path[n]) {
break
}
}
return path[:n]
}
break
}
}
}
return ""
}
// HasPrefix exists for historical compatibility and should not be used.
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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