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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
func isExist(err error) bool {
switch pe := err.(type) {
case nil:
return false
case *PathError:
err = pe.Err
case *LinkError:
err = pe.Err
}
return contains(err.Error(), " exists")
}
func isNotExist(err error) bool {
switch pe := err.(type) {
case nil:
return false
case *PathError:
err = pe.Err
case *LinkError:
err = pe.Err
}
return contains(err.Error(), "does not exist") || contains(err.Error(), "not found") ||
contains(err.Error(), "has been removed") || contains(err.Error(), "no parent")
}
func isPermission(err error) bool {
switch pe := err.(type) {
case nil:
return false
case *PathError:
err = pe.Err
case *LinkError:
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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