LXR busybox/console-tools/reset.c

   1/* vi: set sw=4 ts=4: */
   2/*
   3 * Mini reset implementation for busybox
   4 *
   5 * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
   6 * Written by Erik Andersen and Kent Robotti <robotti@metconnect.com>
   7 *
   8 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   9 */
  10//config:config RESET
  11//config:       bool "reset (345 bytes)"
  12//config:       default y
  13//config:       help
  14//config:       This program is used to reset the terminal screen, if it
  15//config:       gets messed up.
  16
  17//applet:IF_RESET(APPLET_NOEXEC(reset, reset, BB_DIR_USR_BIN, BB_SUID_DROP, reset))
  18
  19//kbuild:lib-$(CONFIG_RESET) += reset.o
  20
  21//usage:#define reset_trivial_usage
  22//usage:       ""
  23//usage:#define reset_full_usage "\n\n"
  24//usage:       "Reset the screen"
  25
  26/* "Standard" version of this tool is in ncurses package */
  27
  28#include "libbb.h"
  29
  30#define ESC "\033"
  31
  32#if ENABLE_STTY
  33int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  34#endif
  35
  36int reset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  37int reset_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  38{
  39        static const char *const args[] = {
  40                "stty", "sane", NULL
  41        };
  42
  43        /* no options, no getopt */
  44
  45        if (/*isatty(STDIN_FILENO) &&*/ isatty(STDOUT_FILENO)) {
  46                /* See 'man 4 console_codes' for details:
  47                 * "ESC c"        -- Reset
  48                 * "ESC ( B"      -- Select G0 Character Set (B = US)
  49                 * "ESC [ m"      -- Reset all display attributes
  50                 * "ESC [ J"      -- Erase to the end of screen
  51                 * "ESC [ ? 25 h" -- Make cursor visible
  52                 */
  53                printf(ESC"c" ESC"(B" ESC"[m" ESC"[J" ESC"[?25h");
  54                /* http://bugs.busybox.net/view.php?id=1414:
  55                 * people want it to reset echo etc: */
  56#if ENABLE_STTY
  57                return stty_main(2, (char**)args);
  58#else
  59                /* Make sure stdout gets drained before we execvp */
  60                fflush_all();
  61                execvp("stty", (char**)args);
  62#endif
  63        }
  64        return EXIT_SUCCESS;
  65}
  66