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/*
* Copyright (C) the libgit2 contributors. All rights reserved.
*
* This file is part of libgit2, distributed under the GNU GPL v2 with
* a Linking Exception. For full terms see the included COPYING file.
*/
#include "common.h"
#include "error.h"
#ifdef GIT_WINHTTP
# include <winhttp.h>
#endif
#ifndef WC_ERR_INVALID_CHARS
#define WC_ERR_INVALID_CHARS 0x80
#endif
char *git_win32_get_error_message(DWORD error_code)
{
LPWSTR lpMsgBuf = NULL;
HMODULE hModule = NULL;
char *utf8_msg = NULL;
int utf8_size;
DWORD dwFlags =
FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_IGNORE_INSERTS;
if (!error_code)
return NULL;
#ifdef GIT_WINHTTP
/* Errors raised by WinHTTP are not in the system resource table */
if (error_code >= WINHTTP_ERROR_BASE &&
error_code <= WINHTTP_ERROR_LAST)
hModule = GetModuleHandleW(L"winhttp");
#endif
GIT_UNUSED(hModule);
if (hModule)
dwFlags |= FORMAT_MESSAGE_FROM_HMODULE;
else
dwFlags |= FORMAT_MESSAGE_FROM_SYSTEM;
if (FormatMessageW(dwFlags, hModule, error_code,
MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(LPWSTR)&lpMsgBuf, 0, NULL)) {
/* Invalid code point check supported on Vista+ only */
if (git_has_win32_version(6, 0, 0))
dwFlags = WC_ERR_INVALID_CHARS;
else
dwFlags = 0;
utf8_size = WideCharToMultiByte(CP_UTF8, dwFlags,
lpMsgBuf, -1, NULL, 0, NULL, NULL);
if (!utf8_size) {
assert(0);
goto on_error;
}
utf8_msg = git__malloc(utf8_size);
if (!utf8_msg)
goto on_error;
if (!WideCharToMultiByte(CP_UTF8, dwFlags,
lpMsgBuf, -1, utf8_msg, utf8_size, NULL, NULL)) {
git__free(utf8_msg);
goto on_error;
}
on_error:
LocalFree(lpMsgBuf);
}
return utf8_msg;
}
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