1 /*
2 * Copyright (C) the libgit2 contributors. All rights reserved.
3 *
4 * This file is part of libgit2, distributed under the GNU GPL v2 with
5 * a Linking Exception. For full terms see the included COPYING file.
6 */
7
8 #include "error.h"
9
10 #include "utf-conv.h"
11
12 #ifdef GIT_WINHTTP
13 # include <winhttp.h>
14 #endif
15
git_win32_get_error_message(DWORD error_code)16 char *git_win32_get_error_message(DWORD error_code)
17 {
18 LPWSTR lpMsgBuf = NULL;
19 HMODULE hModule = NULL;
20 char *utf8_msg = NULL;
21 DWORD dwFlags =
22 FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS;
23
24 if (!error_code)
25 return NULL;
26
27 #ifdef GIT_WINHTTP
28 /* Errors raised by WinHTTP are not in the system resource table */
29 if (error_code >= WINHTTP_ERROR_BASE &&
30 error_code <= WINHTTP_ERROR_LAST)
31 hModule = GetModuleHandleW(L"winhttp");
32 #endif
33
34 GIT_UNUSED(hModule);
35
36 if (hModule)
37 dwFlags |= FORMAT_MESSAGE_FROM_HMODULE;
38 else
39 dwFlags |= FORMAT_MESSAGE_FROM_SYSTEM;
40
41 if (FormatMessageW(dwFlags, hModule, error_code,
42 MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
43 (LPWSTR)&lpMsgBuf, 0, NULL)) {
44 /* Convert the message to UTF-8. If this fails, we will
45 * return NULL, which is a condition expected by the caller */
46 if (git__utf16_to_8_alloc(&utf8_msg, lpMsgBuf) < 0)
47 utf8_msg = NULL;
48
49 LocalFree(lpMsgBuf);
50 }
51
52 return utf8_msg;
53 }
54