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 "uv.h"
  #include "internal.h"
  
  static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno);
  
  
  int uv_dlopen(const char* filename, uv_lib_t* lib) {
    WCHAR filename_w[32768];
  
    lib->handle = NULL;
    lib->errmsg = NULL;
  
    if (!MultiByteToWideChar(CP_UTF8,
                             0,
                             filename,
                             -1,
                             filename_w,
                             ARRAY_SIZE(filename_w))) {
      return uv__dlerror(lib, filename, GetLastError());
    }
  
    lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
    if (lib->handle == NULL) {
      return uv__dlerror(lib, filename, GetLastError());
    }
  
    return 0;
  }
  
  
  void uv_dlclose(uv_lib_t* lib) {
    if (lib->errmsg) {
      LocalFree((void*)lib->errmsg);
      lib->errmsg = NULL;
    }
  
    if (lib->handle) {
      /* Ignore errors. No good way to signal them without leaking memory. */
      FreeLibrary(lib->handle);
      lib->handle = NULL;
    }
  }
  
  
  int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
    *ptr = (void*) GetProcAddress(lib->handle, name);
    return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
  }
  
  
  const char* uv_dlerror(const uv_lib_t* lib) {
    return lib->errmsg ? lib->errmsg : "no error";
  }
  
  
  static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
    DWORD_PTR args[1] = { (DWORD_PTR) errorno };
    LPCSTR fallback_error = "error: %1!d!";
  
    FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
                   FORMAT_MESSAGE_ARGUMENT_ARRAY |
                   FORMAT_MESSAGE_ALLOCATE_BUFFER,
                   fallback_error, 0, 0,
                   (LPSTR) &lib->errmsg,
                   0, (va_list*) args);
  }
  
  
  
  static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
    DWORD_PTR arg;
    DWORD res;
    char* msg;
  
    if (lib->errmsg) {
      LocalFree(lib->errmsg);
      lib->errmsg = NULL;
    }
  
    if (errorno == 0)
      return 0;
  
    res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                         FORMAT_MESSAGE_FROM_SYSTEM |
                         FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
                         MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
                         (LPSTR) &lib->errmsg, 0, NULL);
  
    if (!res && GetLastError() == ERROR_MUI_FILE_NOT_FOUND) {
      res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                           FORMAT_MESSAGE_FROM_SYSTEM |
                           FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
                           0, (LPSTR) &lib->errmsg, 0, NULL);
    }
  
    if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
      msg = lib->errmsg;
      lib->errmsg = NULL;
      arg = (DWORD_PTR) filename;
      res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
                           FORMAT_MESSAGE_ARGUMENT_ARRAY |
                           FORMAT_MESSAGE_FROM_STRING,
                           msg,
                           0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
      LocalFree(msg);
    }
  
    if (!res)
      uv__format_fallback_error(lib, errorno);
  
    return -1;
  }
  