[NaCl SDK] nacl_io: Fix inet_ntop to be consistent with glibc.

native_client_sdk/src/libraries/nacl_io/syscalls/hstrerror.c

+// Copyright 2013 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "nacl_io/ossocket.h"
+
+#ifdef PROVIDES_SOCKET_API
+
+#include <stdio.h>
+
+const char* hstrerror(int err) {
+  switch (err) {
+    case HOST_NOT_FOUND:
+      return "The specified host is unknown.";
+    case NO_ADDRESS:
+      return "The requested name is valid but does not have an IP address.";
+    case NO_RECOVERY:
+      return "A nonrecoverable name server error occurred.";
+    case TRY_AGAIN:
+      return "A temporary error occurred on an authoritative name server. "
+             "Try again later.";
+    case NETDB_INTERNAL:
+      return "Internal error in gethostbyname.";
+  }
+
+  static char rtn[128];
+  snprintf(rtn, sizeof(rtn), "Unknown error in gethostbyname: %d.", err);
+  return rtn;
+}
+
+#endif // PROVIDES_SOCKET_API