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Annotation of src/usr.bin/tic/clear_cmd.c, Revision 1.1

1.1     ! nicm        1: /****************************************************************************
        !             2:  * Copyright 2018,2020 Thomas E. Dickey                                     *
        !             3:  * Copyright 2016,2017 Free Software Foundation, Inc.                       *
        !             4:  *                                                                          *
        !             5:  * Permission is hereby granted, free of charge, to any person obtaining a  *
        !             6:  * copy of this software and associated documentation files (the            *
        !             7:  * "Software"), to deal in the Software without restriction, including      *
        !             8:  * without limitation the rights to use, copy, modify, merge, publish,      *
        !             9:  * distribute, distribute with modifications, sublicense, and/or sell       *
        !            10:  * copies of the Software, and to permit persons to whom the Software is    *
        !            11:  * furnished to do so, subject to the following conditions:                 *
        !            12:  *                                                                          *
        !            13:  * The above copyright notice and this permission notice shall be included  *
        !            14:  * in all copies or substantial portions of the Software.                   *
        !            15:  *                                                                          *
        !            16:  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
        !            17:  * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
        !            18:  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
        !            19:  * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
        !            20:  * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
        !            21:  * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
        !            22:  * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
        !            23:  *                                                                          *
        !            24:  * Except as contained in this notice, the name(s) of the above copyright   *
        !            25:  * holders shall not be used in advertising or otherwise to promote the     *
        !            26:  * sale, use or other dealings in this Software without prior written       *
        !            27:  * authorization.                                                           *
        !            28:  ****************************************************************************/
        !            29:
        !            30: /****************************************************************************
        !            31:  *  Author: Thomas E. Dickey                                                *
        !            32:  ****************************************************************************/
        !            33:
        !            34: /*
        !            35:  * clear.c --  clears the terminal's screen
        !            36:  */
        !            37:
        !            38: #define USE_LIBTINFO
        !            39: #include <clear_cmd.h>
        !            40:
        !            41: MODULE_ID("$Id: clear_cmd.c,v 1.5 2020/02/02 23:34:34 tom Exp $")
        !            42:
        !            43: static int
        !            44: putch(int c)
        !            45: {
        !            46:     return putchar(c);
        !            47: }
        !            48:
        !            49: int
        !            50: clear_cmd(bool legacy)
        !            51: {
        !            52:     int retval = tputs(clear_screen, lines > 0 ? lines : 1, putch);
        !            53:     if (!legacy) {
        !            54:        /* Clear the scrollback buffer if possible. */
        !            55:        char *E3 = tigetstr("E3");
        !            56:        if (E3)
        !            57:            (void) tputs(E3, lines > 0 ? lines : 1, putch);
        !            58:     }
        !            59:     return retval;
        !            60: }