release/src/router/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
  11 /* BTW, which "standard" package has this utility? It doesn't seem
  12  * to be ncurses, coreutils, console-tools... then what? */
  13
  14 //usage:#define reset_trivial_usage
  15 //usage:       ""
  16 //usage:#define reset_full_usage "\n\n"
  17 //usage:       "Reset the screen"
  18
  19 #include "libbb.h"
  20
  21 #define ESC "\033"
  22
  23 #if ENABLE_STTY
  24 int stty_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  25 #endif
  26
  27 int reset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  28 int reset_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  29 {
  30         static const char *const args[] = {
  31                 "stty", "sane", NULL
  32         };
  33
  34         /* no options, no getopt */
  35
  36         if (/*isatty(STDIN_FILENO) &&*/ isatty(STDOUT_FILENO)) {
  37                 /* See 'man 4 console_codes' for details:
  38                  * "ESC c"        -- Reset
  39                  * "ESC ( B"      -- Select G0 Character Set (B = US)
  40                  * "ESC [ 0 m"    -- Reset all display attributes
  41                  * "ESC [ J"      -- Erase to the end of screen
  42                  * "ESC [ ? 25 h" -- Make cursor visible
  43                  */
  44                 printf(ESC"c" ESC"(B" ESC"[0m" ESC"[J" ESC"[?25h");
  45                 /* http://bugs.busybox.net/view.php?id=1414:
  46                  * people want it to reset echo etc: */
  47 #if ENABLE_STTY
  48                 return stty_main(2, (char**)args);
  49 #else
  50                 execvp("stty", (char**)args);
  51 #endif
  52         }
  53         return EXIT_SUCCESS;
  54 }