text: /* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to
  * deal in the Software without restriction, including without limitation the
  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  * sell copies of the Software, and to permit persons to whom the Software is
  * furnished to do so, subject to the following conditions:
  *
  * The above copyright notice and this permission notice shall be included in
  * all copies or substantial portions of the Software.
  *
  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  * IN THE SOFTWARE.
  */
  
  #include <assert.h>
  #include <stdio.h>
  
  #include "uv.h"
  #include "internal.h"
  #include "req-inl.h"
  
  #ifndef GetNameInfo
  int WSAAPI GetNameInfoW(
    const SOCKADDR *pSockaddr,
    socklen_t SockaddrLength,
    PWCHAR pNodeBuffer,
    DWORD NodeBufferSize,
    PWCHAR pServiceBuffer,
    DWORD ServiceBufferSize,
    INT Flags
  );
  #endif
  
  static void uv__getnameinfo_work(struct uv__work* w) {
    uv_getnameinfo_t* req;
    WCHAR host[NI_MAXHOST];
    WCHAR service[NI_MAXSERV];
    int ret = 0;
  
    req = container_of(w, uv_getnameinfo_t, work_req);
    if (GetNameInfoW((struct sockaddr*)&req->storage,
                     sizeof(req->storage),
                     host,
                     ARRAY_SIZE(host),
                     service,
                     ARRAY_SIZE(service),
                     req->flags)) {
      ret = WSAGetLastError();
    }
    req->retcode = uv__getaddrinfo_translate_error(ret);
  
    /* convert results to UTF-8 */
    WideCharToMultiByte(CP_UTF8,
                        0,
                        host,
                        -1,
                        req->host,
                        sizeof(req->host),
                        NULL,
                        NULL);
  
    WideCharToMultiByte(CP_UTF8,
                        0,
                        service,
                        -1,
                        req->service,
                        sizeof(req->service),
                        NULL,
                        NULL);
  }
  
  
  /*
  * Called from uv_run when complete.
  */
  static void uv__getnameinfo_done(struct uv__work* w, int status) {
    uv_getnameinfo_t* req;
    char* host;
    char* service;
  
    req = container_of(w, uv_getnameinfo_t, work_req);
    uv__req_unregister(req->loop, req);
    host = service = NULL;
  
    if (status == UV_ECANCELED) {
      assert(req->retcode == 0);
      req->retcode = UV_EAI_CANCELED;
    } else if (req->retcode == 0) {
      host = req->host;
      service = req->service;
    }
  
    if (req->getnameinfo_cb)
      req->getnameinfo_cb(req, req->retcode, host, service);
  }
  
  
  /*
  * Entry point for getnameinfo
  * return 0 if a callback will be made
  * return error code if validation fails
  */
  int uv_getnameinfo(uv_loop_t* loop,
                     uv_getnameinfo_t* req,
                     uv_getnameinfo_cb getnameinfo_cb,
                     const struct sockaddr* addr,
                     int flags) {
    if (req == NULL || addr == NULL)
      return UV_EINVAL;
  
    if (addr->sa_family == AF_INET) {
      memcpy(&req->storage,
             addr,
             sizeof(struct sockaddr_in));
    } else if (addr->sa_family == AF_INET6) {
      memcpy(&req->storage,
             addr,
             sizeof(struct sockaddr_in6));
    } else {
      return UV_EINVAL;
    }
  
    uv_req_init(loop, (uv_req_t*)req);
    uv__req_register(loop, req);
  
    req->getnameinfo_cb = getnameinfo_cb;
    req->flags = flags;
    req->type = UV_GETNAMEINFO;
    req->loop = loop;
    req->retcode = 0;
  
    if (getnameinfo_cb) {
      uv__work_submit(loop,
                      &req->work_req,
                      uv__getnameinfo_work,
                      uv__getnameinfo_done);
      return 0;
    } else {
      uv__getnameinfo_work(&req->work_req);
      uv__getnameinfo_done(&req->work_req, 0);
      return req->retcode;
    }
  }
  