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/****************************************************************************
* Copyright 2018,2020,2025 Thomas E. Dickey *
* Copyright 2016,2017 Free Software Foundation, Inc. *
* *
* 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, distribute with modifications, 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 ABOVE 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. *
* *
* Except as contained in this notice, the name(s) of the above copyright *
* holders shall not be used in advertising or otherwise to promote the *
* sale, use or other dealings in this Software without prior written *
* authorization. *
****************************************************************************/
/****************************************************************************
* Author: Thomas E. Dickey *
****************************************************************************/
/*
* clear.c -- clears the terminal's screen
*/
#define USE_LIBTINFO
#include <clear_cmd.h>
MODULE_ID("$Id: clear_cmd.c,v 1.8 2025/12/06 21:00:26 tom Exp $")
#ifdef TERMIOS
static int
putch(int c)
{
return putchar(c);
}
#endif
int
clear_cmd(bool legacy)
{
int retval;
#ifdef TERMIOS
retval = tputs(clear_screen, lines > 0 ? lines : 1, putch);
if (!legacy) {
/* Clear the scrollback buffer if possible. */
char *E3 = tigetstr(UserCap(E3));
if (VALID_STRING(E3))
(void) tputs(E3, lines > 0 ? lines : 1, putch);
}
#elif defined(_NC_WINDOWS)
/*
* https://learn.microsoft.com/en-us/windows/console/clearing-the-screen
*/
HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
COORD coordScreen =
{0, 0};
#if defined(ENABLE_VIRTUAL_TERMINAL_PROCESSING)
DWORD mode = 0;
retval = ERR;
if (GetConsoleMode(hConsole, &mode)) {
const DWORD originalMode = mode;
mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
if (SetConsoleMode(hConsole, mode)) {
DWORD written = 0;
PCWSTR sequence = legacy ? L"\x1b[2J" : L"\x1b[2J\x1b[3J";
if (WriteConsoleW(hConsole, sequence,
(DWORD) wcslen(sequence),
&written, NULL)) {
SetConsoleCursorPosition(hConsole, coordScreen);
retval = OK;
}
SetConsoleMode(hConsole, originalMode);
}
}
#else
DWORD cCharsWritten;
CONSOLE_SCREEN_BUFFER_INFO csbi;
DWORD dwConSize;
(void) legacy;
retval = ERR;
/* Get the number of character cells in the current buffer,
* to fill the entire screen with blanks */
if (GetConsoleScreenBufferInfo(hConsole, &csbi)
&& (dwConSize = csbi.dwSize.X * csbi.dwSize.Y) > 0
&& FillConsoleOutputCharacter(hConsole,
(TCHAR) ' ',
dwConSize,
coordScreen,
&cCharsWritten)
&& FillConsoleOutputAttribute(hConsole,
csbi.wAttributes,
dwConSize,
coordScreen,
&cCharsWritten)) {
SetConsoleCursorPosition(hConsole, coordScreen);
retval = OK;
}
#endif
#endif
return retval;
}
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