libgo/go/syscall/errstr_nor.go

   1 // errstr.go -- Error strings when there is no strerror_r.
   2
   3 // Copyright 2011 The Go Authors. All rights reserved.
   4 // Use of this source code is governed by a BSD-style
   5 // license that can be found in the LICENSE file.
   6
   7 package syscall
   8
   9 import (
  10         "sync"
  11         "unsafe"
  12 )
  13
  14 //sysnb strerror(errnum int) (buf *byte)
  15 //strerror(errnum _C_int) *byte
  16
  17 var errstr_lock sync.Mutex
  18
  19 func Errstr(errno int) string {
  20         errstr_lock.Lock()
  21
  22         bp := strerror(errno)
  23         b := (*[1000]byte)(unsafe.Pointer(bp))
  24         i := 0
  25         for b[i] != 0 {
  26                 i++
  27         }
  28
  29         // Lowercase first letter: Bad -> bad, but STREAM -> STREAM.
  30         var s string
  31         if i > 1 && 'A' <= b[0] && b[0] <= 'Z' && 'a' <= b[1] && b[1] <= 'z' {
  32                 c := b[0] + 'a' - 'A'
  33                 s = string(c) + string(b[1:i])
  34         } else {
  35                 s = string(b[:i])
  36         }
  37
  38         errstr_lock.Unlock()
  39
  40         return s
  41 }