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/* $Id: maybe_con_fwrite.c 3547 2022-01-29 02:39:47Z bird $ */
/** @file
* maybe_con_write - Optimized console output on windows.
*/
/*
* Copyright (c) 2016-2018 knut st. osmundsen <bird-kBuild-spamx@anduin.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
* Alternatively, the content of this file may be used under the terms of the
* GPL version 2 or later, or LGPL version 2.1 or later.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "console.h"
#ifdef KBUILD_OS_WINDOWS
# include <windows.h>
#endif
#include <errno.h>
#ifdef _MSC_VER
# include <conio.h>
#endif
/**
* Drop-in fwrite replacement for optimizing console output on windows.
*
*
* @returns Units written; 0 & errno on failure.
* @param pvBuf What to write.
* @param cbUnit How much to write in each unit.
* @param cUnits How many units to write.
* @param pFile The file to write to.
*/
size_t maybe_con_fwrite(void const *pvBuf, size_t cbUnit, size_t cUnits, FILE *pFile)
{
#ifdef KBUILD_OS_WINDOWS
/*
* If it's a TTY, do our own conversion to wide char and call _cputws.
*/
if ( cbUnit > 0
&& cUnits > 0
&& cbUnit < (unsigned)INT_MAX / 4
&& cUnits < (unsigned)INT_MAX / 4
&& (pFile == stdout || pFile == stderr))
{
int fd = fileno(pFile);
if (fd >= 0)
{
HANDLE hCon = (HANDLE)_get_osfhandle(fd);
if ( hCon != INVALID_HANDLE_VALUE
&& hCon != NULL)
{
if (is_console_handle((intptr_t)hCon))
{
/* Use a stack buffer if we can, falling back on the heap for larger writes: */
wchar_t awcBuf[1024];
wchar_t *pawcBuf;
wchar_t *pawcBufFree = NULL;
size_t cbToWrite = cbUnit * cUnits;
size_t cwcBuf = cbToWrite * 2 + 16;
if (cwcBuf < sizeof(awcBuf) / sizeof(awcBuf[0]))
{
pawcBuf = awcBuf;
cwcBuf = sizeof(awcBuf) / sizeof(awcBuf[0]);
}
else
pawcBufFree = pawcBuf = (wchar_t *)malloc(cwcBuf * sizeof(wchar_t));
if (pawcBuf)
{
int cwcToWrite = MultiByteToWideChar(get_crt_codepage(), 0 /*dwFlags*/,
pvBuf, (int)cbToWrite,
pawcBuf, (int)(cwcBuf - 1));
if (cwcToWrite > 0)
{
int rc;
pawcBuf[cwcToWrite] = '\0';
/* Let the CRT do the rest. At least the Visual C++ 2010 CRT
sources indicates _cputws will do the right thing. */
fflush(pFile);
rc = _cputws(pawcBuf);
if (pawcBufFree)
free(pawcBufFree);
if (rc >= 0)
return cUnits;
return 0;
}
free(pawcBufFree);
}
}
}
}
}
#endif
/*
* Semi regular write handling.
*/
return fwrite(pvBuf, cbUnit, cUnits, pFile);
}
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