Adds htonl, htons, ntohl, and ntohs to newlib

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

Index: native_client_sdk/src/libraries/nacl_io/syscalls/htonl.c
diff --git a/native_client_sdk/src/libraries/nacl_io/syscalls/htonl.c b/native_client_sdk/src/libraries/nacl_io/syscalls/htonl.c
new file mode 100644
index 0000000000000000000000000000000000000000..f198c62afbd18a40af21d59997e9dc761ba3387e
--- /dev/null
+++ b/native_client_sdk/src/libraries/nacl_io/syscalls/htonl.c
@@ -0,0 +1,18 @@
+/* Copyright (c) 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"
+#if defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)
+
+inline uint32_t htonl(uint32_t hostlong) {
+  uint8_t result_bytes[4];
+  result_bytes[0] = (uint8_t) ((hostlong >> 24) & 0xFF);
+  result_bytes[1] = (uint8_t) ((hostlong >> 16) & 0xFF);
+  result_bytes[2] = (uint8_t) ((hostlong >> 8) & 0xFF);
+  result_bytes[3] = (uint8_t) (hostlong & 0xFF);
+  uint32_t* result = (uint32_t*) result_bytes;

[binji, 2013/08/08 16:07:21]

This breaks strict aliasing rules. Probably will work, but AIUI it is safer to
use a memcpy here (or cast via union, which is technically "unspecified" but
apparently supported by most compilers).

Same for all the other functions.

[torinmr, 2013/08/08 17:10:07]

Done.

+  return *result;
+}
+
+#endif  // defined(PROVIDES_SOCKET_API) && !defined(__GLIBC__)

[Sam Clegg, 2013/08/08 01:47:25]

Use C++ comment

[binji, 2013/08/08 16:07:21]

You mean C89 comment.

[torinmr, 2013/08/08 17:01:22]

Done.