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

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

Index: native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
diff --git a/native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c b/native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
new file mode 100644
index 0000000000000000000000000000000000000000..98dbe8f94cd13c4174b21a16871d1b23fe59ec9d
--- /dev/null
+++ b/native_client_sdk/src/libraries/nacl_io/syscalls/inet_addr.c
@@ -0,0 +1,20 @@
+// Copyright 2014 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"
+
+#if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
+
+#include <string.h>
+
+in_addr_t inet_addr(const char* addr) {
+   struct in_addr rtn = { 0 };
+   int ret = inet_aton(addr, &rtn);
+   // inet_ntoa returns zero if addr is not valid
+   if (ret == 0)
+     return INADDR_NONE;
+   return rtn.s_addr;
+}
+
+#endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)