// Copyright 2011 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package os
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func isExist(err error) bool {
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return checkErrMessageContent(err, "exists", "is a directory")
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}
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func isNotExist(err error) bool {
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return checkErrMessageContent(err, "does not exist", "not found",
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"has been removed", "no parent")
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}
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func isPermission(err error) bool {
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return checkErrMessageContent(err, "permission denied")
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}
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// checkErrMessageContent checks if err message contains one of msgs.
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func checkErrMessageContent(err error, msgs ...string) bool {
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if err == nil {
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return false
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}
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err = underlyingError(err)
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for _, msg := range msgs {
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if contains(err.Error(), msg) {
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return true
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}
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}
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return false
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}
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// contains is a local version of strings.Contains. It knows len(sep) > 1.
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func contains(s, sep string) bool {
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n := len(sep)
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c := sep[0]
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for i := 0; i+n <= len(s); i++ {
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if s[i] == c && s[i:i+n] == sep {
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return true
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}
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}
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return false
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}
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