diff options
Diffstat (limited to 'progs/clear.c')
| -rw-r--r-- | progs/clear.c | 67 |
1 files changed, 54 insertions, 13 deletions
diff --git a/progs/clear.c b/progs/clear.c index 4ac503e..85a5ea5 100644 --- a/progs/clear.c +++ b/progs/clear.c @@ -1,5 +1,6 @@ /**************************************************************************** - * Copyright (c) 1998-2007,2013 Free Software Foundation, Inc. * + * Copyright 2020 Thomas E. Dickey * + * Copyright 1998-2016,2017 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 * @@ -37,14 +38,29 @@ */ #define USE_LIBTINFO -#include <progs.priv.h> +#include <clear_cmd.h> +#include <tty_settings.h> -MODULE_ID("$Id: clear.c,v 1.13 2013/06/22 22:20:54 tom Exp $") +MODULE_ID("$Id: clear.c,v 1.23 2020/02/02 23:34:34 tom Exp $") -static int -putch(int c) +const char *_nc_progname = "clear"; + +static void +usage(void) { - return putchar(c); +#define KEEP(s) s "\n" + static const char msg[] = + { + KEEP("") + KEEP("Options:") + KEEP(" -T TERM use this instead of $TERM") + KEEP(" -V print curses-version") + KEEP(" -x do not try to clear scrollback") + }; +#undef KEEP + (void) fprintf(stderr, "Usage: %s [options]\n", _nc_progname); + fputs(msg, stderr); + ExitProgram(EXIT_FAILURE); } int @@ -52,16 +68,41 @@ main( int argc GCC_UNUSED, char *argv[]GCC_UNUSED) { - char *E3; + TTY tty_settings; + int fd; + int c; + char *term; + bool opt_x = FALSE; /* clear scrollback if possible */ + + _nc_progname = _nc_rootname(argv[0]); + term = getenv("TERM"); + + while ((c = getopt(argc, argv, "T:Vx")) != -1) { + switch (c) { + case 'T': + use_env(FALSE); + use_tioctl(TRUE); + term = optarg; + break; + case 'V': + puts(curses_version()); + ExitProgram(EXIT_SUCCESS); + case 'x': /* do not try to clear scrollback */ + opt_x = TRUE; + break; + default: + usage(); + /* NOTREACHED */ + } + } + if (optind < argc) + usage(); - setupterm((char *) 0, STDOUT_FILENO, (int *) 0); + fd = save_tty_settings(&tty_settings, FALSE); - /* Clear the scrollback buffer if possible. */ - E3 = tigetstr("E3"); - if (E3) - (void) tputs(E3, lines > 0 ? lines : 1, putch); + setupterm(term, fd, (int *) 0); - ExitProgram((tputs(clear_screen, lines > 0 ? lines : 1, putch) == ERR) + ExitProgram((clear_cmd(opt_x) == ERR) ? EXIT_FAILURE : EXIT_SUCCESS); } |