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12345678910111213141516171819202122232425262728293031323334353637383940//// gettemppath.cpp//// Copyright (c) Microsoft Corporation. All rights reserved.//// The __acrt_GetTempPath2A() function, which calls GetTempPathW and converts the string to multibyte.//#include <corecrt_internal.h>#include <io.h>
// This function simply calls __acrt_GetTempPath2W() and converts the wide string to multibyte.// Note that GetTempPathA is not UTF-8 aware. This is because APIs using temporary paths// must not depend on the current locale setting and must use the ACP or OEMCP since// the returned data must be a static buffer and this behavior is guaranteed by MSDN documentation.extern "C" DWORD __cdecl __acrt_GetTempPath2A(DWORD nBufferLength, LPSTR lpBuffer){ wchar_t wide_buffer[_MAX_PATH + 1] = {};
DWORD const get_temp_path_result = __acrt_GetTempPath2W(_countof(wide_buffer), wide_buffer); if (get_temp_path_result == 0) { return 0; }
bool const use_oem_code_page = !__acrt_AreFileApisANSI(); int const code_page = use_oem_code_page ? CP_OEMCP : CP_ACP;#pragma warning(suppress:__WARNING_W2A_BEST_FIT) // 38021 Prefast recommends WC_NO_BEST_FIT_CHARS. int const wctmb_result = __acrt_WideCharToMultiByte(code_page, 0, wide_buffer, -1, lpBuffer, nBufferLength, nullptr, nullptr); if (wctmb_result == 0) { return 0; }
// The return value of WideCharToMultiByte includes the null terminator; the // return value of GetTempPathA does not. return wctmb_result - 1;}