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// errstr.go -- Error strings.
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package syscall
import "internal/bytealg"
//extern go_strerror
func go_strerror(_C_int, *byte, Size_t) _C_int
func Errstr(errnum int) string {
for size := 128; ; size *= 2 {
b := make([]byte, size)
errno := go_strerror(_C_int(errnum), &b[0], Size_t(len(b)))
if errno == 0 {
i := bytealg.IndexByte(b, 0)
// Lowercase first letter: Bad -> bad, but
// STREAM -> STREAM.
if i > 1 && 'A' <= b[0] && b[0] <= 'Z' && 'a' <= b[1] && b[1] <= 'z' {
b[0] += 'a' - 'A'
}
return string(b[:i])
}
if errno != ERANGE {
return "strerror_r failure"
}
}
}
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