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      1 // Copyright 2011 The Go Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style
      3 // license that can be found in the LICENSE file.
      4 
      5 package os
      6 
      7 func isExist(err error) bool {
      8 	return checkErrMessageContent(err, " exists")
      9 }
     10 
     11 func isNotExist(err error) bool {
     12 	return checkErrMessageContent(err, "does not exist", "not found",
     13 		"has been removed", "no parent")
     14 }
     15 
     16 func isPermission(err error) bool {
     17 	return checkErrMessageContent(err, "permission denied")
     18 }
     19 
     20 // checkErrMessageContent checks if err message contains one of msgs.
     21 func checkErrMessageContent(err error, msgs ...string) bool {
     22 	if err == nil {
     23 		return false
     24 	}
     25 	err = underlyingError(err)
     26 	for _, msg := range msgs {
     27 		if contains(err.Error(), msg) {
     28 			return true
     29 		}
     30 	}
     31 	return false
     32 }
     33 
     34 // contains is a local version of strings.Contains. It knows len(sep) > 1.
     35 func contains(s, sep string) bool {
     36 	n := len(sep)
     37 	c := sep[0]
     38 	for i := 0; i+n <= len(s); i++ {
     39 		if s[i] == c && s[i:i+n] == sep {
     40 			return true
     41 		}
     42 	}
     43 	return false
     44 }
     45