huwcampbell.com
Reactos
1//
2// gettemppath.cpp
3//
4// Copyright (c) Microsoft Corporation. All rights reserved.
5//
6// The __acrt_GetTempPath2A() function, which calls GetTempPathW and converts the string to multibyte.
7//
8#include <corecrt_internal.h>
9#include <io.h>
10
11
12
13// This function simply calls __acrt_GetTempPath2W() and converts the wide string to multibyte.
14// Note that GetTempPathA is not UTF-8 aware. This is because APIs using temporary paths
15// must not depend on the current locale setting and must use the ACP or OEMCP since
16// the returned data must be a static buffer and this behavior is guaranteed by MSDN documentation.
17extern "C" DWORD __cdecl __acrt_GetTempPath2A(DWORD nBufferLength, LPSTR lpBuffer)
18{
19 wchar_t wide_buffer[_MAX_PATH + 1] = {};
20
21 DWORD const get_temp_path_result = __acrt_GetTempPath2W(_countof(wide_buffer), wide_buffer);
22 if (get_temp_path_result == 0)
23 {
24 return 0;
25 }
26
27 bool const use_oem_code_page = !__acrt_AreFileApisANSI();
28 int const code_page = use_oem_code_page ? CP_OEMCP : CP_ACP;
29#pragma warning(suppress:__WARNING_W2A_BEST_FIT) // 38021 Prefast recommends WC_NO_BEST_FIT_CHARS.
30 int const wctmb_result = __acrt_WideCharToMultiByte(code_page, 0, wide_buffer, -1, lpBuffer, nBufferLength, nullptr, nullptr);
31 if (wctmb_result == 0)
32 {
33 return 0;
34 }
35
36 // The return value of WideCharToMultiByte includes the null terminator; the
37 // return value of GetTempPathA does not.
38 return wctmb_result - 1;
39}