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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 {
return checkErrMessageContent(err, " exists")
}
func isNotExist(err error) bool {
return checkErrMessageContent(err, "does not exist", "not found",
"has been removed", "no parent")
}
func isPermission(err error) bool {
return checkErrMessageContent(err, "permission denied")
}
// checkErrMessageContent checks if err message contains one of msgs.
func checkErrMessageContent(err error, msgs ...string) bool {
if err == nil {
return false
}
err = underlyingError(err)
for _, msg := range msgs {
if contains(err.Error(), msg) {
return true
}
}
return false
}
// 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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