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// Copyright 2018 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 str
import (
"path/filepath"
"strings"
)
// HasFilePathPrefix reports whether the filesystem path s begins with the
// elements in prefix.
func HasFilePathPrefix(s, prefix string) bool {
sv := strings.ToUpper(filepath.VolumeName(s))
pv := strings.ToUpper(filepath.VolumeName(prefix))
s = s[len(sv):]
prefix = prefix[len(pv):]
switch {
default:
return false
case sv != pv:
return false
case len(s) == len(prefix):
return s == prefix
case len(s) > len(prefix):
if prefix != "" && prefix[len(prefix)-1] == filepath.Separator {
return strings.HasPrefix(s, prefix)
}
return s[len(prefix)] == filepath.Separator && s[:len(prefix)] == prefix
}
}
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