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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) {
l := volumeNameLen(path)
if l == 0 {
return false
}
path = path[l:]
if path == "" {
return false
}
return isSlash(path[0])
}
// volumeNameLen returns length of the leading volume name on Windows.
// It returns 0 elsewhere.
func volumeNameLen(path string) int {
if len(path) < 2 {
return 0
}
// with drive letter
c := path[0]
if path[1] == ':' && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
return 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 n
}
break
}
}
}
return 0
}
// 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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