Prepared newlib toolchain for socket implementation

native_client_sdk/src/libraries/nacl_io/inet_ntoa.cc

+// 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"
+
+#ifdef PROVIDES_SOCKET_API
+
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+
+#include <iostream>
+#include <sstream>
+#include <string>
+
+static inline uint8_t get_byte(const void* addr, int byte) {
+  const char* buf = static_cast<const char*>(addr);
+  return static_cast<uint8_t>(buf[byte]);
+}
+
+char* inet_ntoa(struct in_addr in) {
+  static char addr[INET_ADDRSTRLEN];
+  snprintf(addr, INET_ADDRSTRLEN, "%u.%u.%u.%u",
+           get_byte(&in, 0), get_byte(&in, 1),
+           get_byte(&in, 2), get_byte(&in, 3));
+  return addr;
+}
+
+const char* inet_ntop(int af, const void* src, char* dst, socklen_t size) {
+  if (AF_INET == af) {
+    if (size < INET_ADDRSTRLEN) {
+      errno = ENOSPC;
+      return NULL;
+    }
+    struct in_addr in;
+    memcpy(&in, src, sizeof(in));
+    char* result = inet_ntoa(in);
+    memcpy(dst, result, strlen(result) + 1);
+    return dst;
+  }
+
+  if (AF_INET6 == af) {
+    if (size < INET6_ADDRSTRLEN) {
+      errno = ENOSPC;
+      return NULL;
+    }
+    const uint8_t* tuples = static_cast<const uint8_t*>(src);
+    std::stringstream output;
+    for (int i = 0; i < 8; i++) {
+      uint16_t tuple = (tuples[2*i] << 8) + tuples[2*i+1];
+      output << std::hex << tuple;
+      if (i < 7) {
+        output << ":";
+      }
+    }
+    memcpy(dst, output.str().c_str(), output.str().size() + 1);
+    return dst;
+  }
+
+  errno = EAFNOSUPPORT;
+  return NULL;
+}
+
+#endif // PROVIDES_SOCKET_API