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         switch pe := err.(type) {
   9         case nil:
  10                 return false
  11         case *PathError:
  12                 err = pe.Err
  13         case *LinkError:
  14                 err = pe.Err
  15         }
  16         return contains(err.Error(), " exists")
  17 }
  18
  19 func isNotExist(err error) bool {
  20         switch pe := err.(type) {
  21         case nil:
  22                 return false
  23         case *PathError:
  24                 err = pe.Err
  25         case *LinkError:
  26                 err = pe.Err
  27         }
  28         return contains(err.Error(), "does not exist")
  29 }
  30
  31 func isPermission(err error) bool {
  32         switch pe := err.(type) {
  33         case nil:
  34                 return false
  35         case *PathError:
  36                 err = pe.Err
  37         case *LinkError:
  38                 err = pe.Err
  39         }
  40         return contains(err.Error(), "permission denied")
  41 }
  42
  43 // contains is a local version of strings.Contains. It knows len(sep) > 1.
  44 func contains(s, sep string) bool {
  45         n := len(sep)
  46         c := sep[0]
  47         for i := 0; i+n <= len(s); i++ {
  48                 if s[i] == c && s[i:i+n] == sep {
  49                         return true
  50                 }
  51         }
  52         return false
  53 }