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// Copyright 2017 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 load
import (
"path/filepath"
"strings"
)
// hasSubdir reports whether dir is a subdirectory of
// (possibly multiple levels below) root.
// If so, it sets rel to the path fragment that must be
// appended to root to reach dir.
func hasSubdir(root, dir string) (rel string, ok bool) {
if p, err := filepath.EvalSymlinks(root); err == nil {
root = p
}
if p, err := filepath.EvalSymlinks(dir); err == nil {
dir = p
}
const sep = string(filepath.Separator)
root = filepath.Clean(root)
if !strings.HasSuffix(root, sep) {
root += sep
}
dir = filepath.Clean(dir)
if !strings.HasPrefix(dir, root) {
return "", false
}
return filepath.ToSlash(dir[len(root):]), true
}
// hasPathPrefix reports whether the path s begins with the
// elements in prefix.
func hasPathPrefix(s, prefix string) bool {
switch {
default:
return false
case len(s) == len(prefix):
return s == prefix
case len(s) > len(prefix):
if prefix != "" && prefix[len(prefix)-1] == '/' {
return strings.HasPrefix(s, prefix)
}
return s[len(prefix)] == '/' && s[:len(prefix)] == prefix
}
}
// expandPath returns the symlink-expanded form of path.
func expandPath(p string) string {
x, err := filepath.EvalSymlinks(p)
if err == nil {
return x
}
return p
}
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