mirror of git://gcc.gnu.org/git/gcc.git
106 lines
2.2 KiB
Go
106 lines
2.2 KiB
Go
// Copyright 2010 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package filepath
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import (
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"strings"
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)
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func isSlash(c uint8) bool {
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return c == '\\' || c == '/'
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}
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// IsAbs returns true if the path is absolute.
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func IsAbs(path string) (b bool) {
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l := volumeNameLen(path)
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if l == 0 {
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return false
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}
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path = path[l:]
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if path == "" {
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return false
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}
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return isSlash(path[0])
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}
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// volumeNameLen returns length of the leading volume name on Windows.
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// It returns 0 elsewhere.
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func volumeNameLen(path string) int {
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if len(path) < 2 {
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return 0
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}
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// with drive letter
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c := path[0]
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if path[1] == ':' && ('a' <= c && c <= 'z' || 'A' <= c && c <= 'Z') {
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return 2
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}
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// is it UNC
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if l := len(path); l >= 5 && isSlash(path[0]) && isSlash(path[1]) &&
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!isSlash(path[2]) && path[2] != '.' {
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// first, leading `\\` and next shouldn't be `\`. its server name.
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for n := 3; n < l-1; n++ {
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// second, next '\' shouldn't be repeated.
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if isSlash(path[n]) {
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n++
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// third, following something characters. its share name.
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if !isSlash(path[n]) {
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if path[n] == '.' {
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break
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}
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for ; n < l; n++ {
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if isSlash(path[n]) {
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break
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}
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}
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return n
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}
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break
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}
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}
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}
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return 0
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}
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// HasPrefix exists for historical compatibility and should not be used.
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func HasPrefix(p, prefix string) bool {
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if strings.HasPrefix(p, prefix) {
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return true
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}
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return strings.HasPrefix(strings.ToLower(p), strings.ToLower(prefix))
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}
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func splitList(path string) []string {
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// The same implementation is used in LookPath in os/exec;
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// consider changing os/exec when changing this.
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if path == "" {
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return []string{}
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}
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// Split path, respecting but preserving quotes.
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list := []string{}
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start := 0
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quo := false
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for i := 0; i < len(path); i++ {
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switch c := path[i]; {
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case c == '"':
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quo = !quo
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case c == ListSeparator && !quo:
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list = append(list, path[start:i])
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start = i + 1
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}
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}
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list = append(list, path[start:])
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// Remove quotes.
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for i, s := range list {
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if strings.Contains(s, `"`) {
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list[i] = strings.Replace(s, `"`, ``, -1)
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}
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}
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return list
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}
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