mirror of
https://github.com/ThomasDickey/ncurses-snapshots.git
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120 lines
4.4 KiB
C
120 lines
4.4 KiB
C
/****************************************************************************
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* Copyright 2018,2020,2025 Thomas E. Dickey *
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* Copyright 2016,2017 Free Software Foundation, Inc. *
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* *
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* Permission is hereby granted, free of charge, to any person obtaining a *
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* copy of this software and associated documentation files (the *
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* "Software"), to deal in the Software without restriction, including *
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* without limitation the rights to use, copy, modify, merge, publish, *
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* distribute, distribute with modifications, sublicense, and/or sell *
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* copies of the Software, and to permit persons to whom the Software is *
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* furnished to do so, subject to the following conditions: *
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* *
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* The above copyright notice and this permission notice shall be included *
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* in all copies or substantial portions of the Software. *
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* *
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS *
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* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF *
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. *
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* IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, *
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR *
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR *
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* THE USE OR OTHER DEALINGS IN THE SOFTWARE. *
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* *
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* Except as contained in this notice, the name(s) of the above copyright *
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* holders shall not be used in advertising or otherwise to promote the *
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* sale, use or other dealings in this Software without prior written *
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* authorization. *
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****************************************************************************/
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/****************************************************************************
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* Author: Thomas E. Dickey *
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****************************************************************************/
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/*
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* clear.c -- clears the terminal's screen
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*/
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#define USE_LIBTINFO
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#include <clear_cmd.h>
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MODULE_ID("$Id: clear_cmd.c,v 1.8 2025/12/06 21:00:26 tom Exp $")
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#ifdef TERMIOS
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static int
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putch(int c)
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{
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return putchar(c);
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}
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#endif
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int
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clear_cmd(bool legacy)
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{
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int retval;
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#ifdef TERMIOS
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retval = tputs(clear_screen, lines > 0 ? lines : 1, putch);
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if (!legacy) {
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/* Clear the scrollback buffer if possible. */
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char *E3 = tigetstr(UserCap(E3));
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if (VALID_STRING(E3))
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(void) tputs(E3, lines > 0 ? lines : 1, putch);
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}
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#elif defined(_NC_WINDOWS)
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/*
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* https://learn.microsoft.com/en-us/windows/console/clearing-the-screen
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*/
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HANDLE hConsole = GetStdHandle(STD_OUTPUT_HANDLE);
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COORD coordScreen =
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{0, 0};
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#if defined(ENABLE_VIRTUAL_TERMINAL_PROCESSING)
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DWORD mode = 0;
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retval = ERR;
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if (GetConsoleMode(hConsole, &mode)) {
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const DWORD originalMode = mode;
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mode |= ENABLE_VIRTUAL_TERMINAL_PROCESSING;
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if (SetConsoleMode(hConsole, mode)) {
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DWORD written = 0;
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PCWSTR sequence = legacy ? L"\x1b[2J" : L"\x1b[2J\x1b[3J";
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if (WriteConsoleW(hConsole, sequence,
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(DWORD) wcslen(sequence),
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&written, NULL)) {
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SetConsoleCursorPosition(hConsole, coordScreen);
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retval = OK;
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}
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SetConsoleMode(hConsole, originalMode);
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}
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}
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#else
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DWORD cCharsWritten;
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CONSOLE_SCREEN_BUFFER_INFO csbi;
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DWORD dwConSize;
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(void) legacy;
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retval = ERR;
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/* Get the number of character cells in the current buffer,
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* to fill the entire screen with blanks */
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if (GetConsoleScreenBufferInfo(hConsole, &csbi)
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&& (dwConSize = csbi.dwSize.X * csbi.dwSize.Y) > 0
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&& FillConsoleOutputCharacter(hConsole,
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(TCHAR) ' ',
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dwConSize,
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coordScreen,
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&cCharsWritten)
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&& FillConsoleOutputAttribute(hConsole,
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csbi.wAttributes,
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dwConSize,
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coordScreen,
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&cCharsWritten)) {
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SetConsoleCursorPosition(hConsole, coordScreen);
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retval = OK;
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}
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#endif
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#endif
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return retval;
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}
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