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 } 61