libuv-svace-build

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/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
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 *
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 * Permission is hereby granted, free of charge, to any person obtaining a copy
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 * of this software and associated documentation files (the "Software"), to
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 * deal in the Software without restriction, including without limitation the
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 * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
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 * sell copies of the Software, and to permit persons to whom the Software is
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 * furnished to do so, subject to the following conditions:
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 *
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 * The above copyright notice and this permission notice shall be included in
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 * all copies or substantial portions of the Software.
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 *
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 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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 * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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 * IN THE SOFTWARE.
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 */
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#include "uv.h"
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#include "internal.h"
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static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno);
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int uv_dlopen(const char* filename, uv_lib_t* lib) {
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  WCHAR filename_w[32768];
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  ssize_t r;
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  lib->handle = NULL;
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  lib->errmsg = NULL;
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  r = uv_wtf8_length_as_utf16(filename);
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  if (r < 0)
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    return uv__dlerror(lib, filename, ERROR_NO_UNICODE_TRANSLATION);
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  if ((size_t) r > ARRAY_SIZE(filename_w))
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    return uv__dlerror(lib, filename, ERROR_INSUFFICIENT_BUFFER);
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  uv_wtf8_to_utf16(filename, filename_w, r);
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  lib->handle = LoadLibraryExW(filename_w, NULL, LOAD_WITH_ALTERED_SEARCH_PATH);
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  if (lib->handle == NULL) {
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    return uv__dlerror(lib, filename, GetLastError());
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  }
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  return 0;
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}
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void uv_dlclose(uv_lib_t* lib) {
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  if (lib->errmsg) {
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    LocalFree((void*)lib->errmsg);
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    lib->errmsg = NULL;
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  }
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  if (lib->handle) {
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    /* Ignore errors. No good way to signal them without leaking memory. */
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    FreeLibrary(lib->handle);
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    lib->handle = NULL;
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  }
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}
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int uv_dlsym(uv_lib_t* lib, const char* name, void** ptr) {
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  /* Cast though integer to suppress pedantic warning about forbidden cast. */
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  *ptr = (void*)(uintptr_t) GetProcAddress(lib->handle, name);
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  return uv__dlerror(lib, "", *ptr ? 0 : GetLastError());
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}
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const char* uv_dlerror(const uv_lib_t* lib) {
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  return lib->errmsg ? lib->errmsg : "no error";
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}
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static void uv__format_fallback_error(uv_lib_t* lib, int errorno){
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  static const CHAR fallback_error[] = "error: %1!d!";
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  DWORD_PTR args[1];
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  args[0] = (DWORD_PTR) errorno;
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  FormatMessageA(FORMAT_MESSAGE_FROM_STRING |
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                 FORMAT_MESSAGE_ARGUMENT_ARRAY |
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                 FORMAT_MESSAGE_ALLOCATE_BUFFER,
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                 fallback_error, 0, 0,
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                 (LPSTR) &lib->errmsg,
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                 0, (va_list*) args);
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}
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static int uv__dlerror(uv_lib_t* lib, const char* filename, DWORD errorno) {
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  DWORD_PTR arg;
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  DWORD res;
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  char* msg;
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  if (lib->errmsg) {
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    LocalFree(lib->errmsg);
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    lib->errmsg = NULL;
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  }
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  if (errorno == 0)
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    return 0;
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  res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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                       FORMAT_MESSAGE_FROM_SYSTEM |
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                       FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
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                       MAKELANGID(LANG_ENGLISH, SUBLANG_ENGLISH_US),
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                       (LPSTR) &lib->errmsg, 0, NULL);
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  if (!res && (GetLastError() == ERROR_MUI_FILE_NOT_FOUND ||
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               GetLastError() == ERROR_RESOURCE_TYPE_NOT_FOUND)) {
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    res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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                         FORMAT_MESSAGE_FROM_SYSTEM |
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                         FORMAT_MESSAGE_IGNORE_INSERTS, NULL, errorno,
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                         0, (LPSTR) &lib->errmsg, 0, NULL);
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  }
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  if (res && errorno == ERROR_BAD_EXE_FORMAT && strstr(lib->errmsg, "%1")) {
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    msg = lib->errmsg;
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    lib->errmsg = NULL;
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    arg = (DWORD_PTR) filename;
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    res = FormatMessageA(FORMAT_MESSAGE_ALLOCATE_BUFFER |
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                         FORMAT_MESSAGE_ARGUMENT_ARRAY |
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                         FORMAT_MESSAGE_FROM_STRING,
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                         msg,
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                         0, 0, (LPSTR) &lib->errmsg, 0, (va_list*) &arg);
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    LocalFree(msg);
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  }
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  if (!res)
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    uv__format_fallback_error(lib, errorno);
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  return -1;
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}
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