libgo/go/os/error_plan9.go

   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", "is a directory")
   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 }