1 /**************************************************************************** 2 * Copyright (c) 1998-2016,2017 Free Software Foundation, Inc. * 3 * * 4 * Permission is hereby granted, free of charge, to any person obtaining a * 5 * copy of this software and associated documentation files (the * 6 * "Software"), to deal in the Software without restriction, including * 7 * without limitation the rights to use, copy, modify, merge, publish, * 8 * distribute, distribute with modifications, sublicense, and/or sell * 9 * copies of the Software, and to permit persons to whom the Software is * 10 * furnished to do so, subject to the following conditions: * 11 * * 12 * The above copyright notice and this permission notice shall be included * 13 * in all copies or substantial portions of the Software. * 14 * * 15 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS * 16 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * 17 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * 18 * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, * 19 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR * 20 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR * 21 * THE USE OR OTHER DEALINGS IN THE SOFTWARE. * 22 * * 23 * Except as contained in this notice, the name(s) of the above copyright * 24 * holders shall not be used in advertising or otherwise to promote the * 25 * sale, use or other dealings in this Software without prior written * 26 * authorization. * 27 ****************************************************************************/ 28 29 /**************************************************************************** 30 * Author: Zeyd M. Ben-Halim <zmbenhal@netcom.com> 1992,1995 * 31 * and: Eric S. Raymond <esr@snark.thyrsus.com> * 32 * and: Thomas E. Dickey 1996-on * 33 ****************************************************************************/ 34 35 /* 36 * clear.c -- clears the terminal's screen 37 */ 38 39 #define USE_LIBTINFO 40 #include <clear_cmd.h> 41 #include <tty_settings.h> 42 43 MODULE_ID("$Id: clear.c,v 1.22 2017/10/07 21:48:32 tom Exp $") 44 45 const char *_nc_progname = "clear"; 46 47 static void 48 usage(void) 49 { 50 #define KEEP(s) s "\n" 51 static const char msg[] = 52 { 53 KEEP("") 54 KEEP("Options:") 55 KEEP(" -T TERM use this instead of $TERM") 56 KEEP(" -V print curses-version") 57 KEEP(" -x do not try to clear scrollback") 58 }; 59 #undef KEEP 60 (void) fprintf(stderr, "Usage: %s [options]\n", _nc_progname); 61 fputs(msg, stderr); 62 ExitProgram(EXIT_FAILURE); 63 } 64 65 int 66 main( 67 int argc GCC_UNUSED, 68 char *argv[]GCC_UNUSED) 69 { 70 TTY tty_settings; 71 int fd; 72 int c; 73 char *term; 74 bool opt_x = FALSE; /* clear scrollback if possible */ 75 76 _nc_progname = _nc_rootname(argv[0]); 77 term = getenv("TERM"); 78 79 while ((c = getopt(argc, argv, "T:Vx")) != -1) { 80 switch (c) { 81 case 'T': 82 use_env(FALSE); 83 use_tioctl(TRUE); 84 term = optarg; 85 break; 86 case 'V': 87 puts(curses_version()); 88 ExitProgram(EXIT_SUCCESS); 89 case 'x': /* do not try to clear scrollback */ 90 opt_x = TRUE; 91 break; 92 default: 93 usage(); 94 /* NOTREACHED */ 95 } 96 } 97 if (optind < argc) 98 usage(); 99 100 fd = save_tty_settings(&tty_settings, FALSE); 101 102 setupterm(term, fd, (int *) 0); 103 104 ExitProgram((clear_cmd(opt_x) == ERR) 105 ? EXIT_FAILURE 106 : EXIT_SUCCESS); 107 } 108