Prepared newlib toolchain for socket implementation

native_client_sdk/src/libraries/nacl_io/inet_ntoa.cc

+#include <arpa/inet.h>

[Sam Clegg, 2013/08/01 20:50:53]

Missing copyright.

[torinmr, 2013/08/01 22:04:00]

Done.

+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+
+#include <iostream>
+#include <sstream>
+#include <string>
+
+static inline uint8_t get_byte(const void *addr, int byte) {

[Sam Clegg, 2013/08/01 20:50:53]

We use the "char* " rather than "char *" style.

[torinmr, 2013/08/01 22:04:00]

Done.

+  const char *buf = static_cast<const char*>(addr);
+  return static_cast<uint8_t>(buf[byte]);
+}
+
+char *inet_ntoa(struct in_addr in) {

[Sam Clegg, 2013/08/01 20:50:53]

Are these functions missing under glibc?  If not maybe these functions should be
newlib only?

+  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;
+}