github.com/llvm-mirror/llgo@v0.0.0-20190322182713-bf6f0a60fce1/third_party/gofrontend/libgo/go/syscall/errstr_nor.go (about)

     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  }