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// Copyright 2011 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 os
// IsExist returns whether the error is known to report that a file already exists.
func IsExist(err error) bool {
if pe, ok := err.(*PathError); ok {
err = pe.Err
}
return contains(err.Error(), " exists")
}
// IsNotExist returns whether the error is known to report that a file does not exist.
func IsNotExist(err error) bool {
if pe, ok := err.(*PathError); ok {
err = pe.Err
}
return contains(err.Error(), "does not exist")
}
// IsPermission returns whether the error is known to report that permission is denied.
func IsPermission(err error) bool {
if pe, ok := err.(*PathError); ok {
err = pe.Err
}
return contains(err.Error(), "permission denied")
}
// contains is a local version of strings.Contains. It knows len(sep) > 1.
func contains(s, sep string) bool {
n := len(sep)
c := sep[0]
for i := 0; i+n <= len(s); i++ {
if s[i] == c && s[i:i+n] == sep {
return true
}
}
return false
}
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