text: /* vi: set sw=4 ts=4: */
  /*
   * resize - set terminal width and height.
   *
   * Copyright 2006 Bernhard Reutner-Fischer
   *
   * Licensed under GPLv2 or later, see file LICENSE in this source tree.
   */
  /* no options, no getopt */
  
  //usage:#define resize_trivial_usage
  //usage:       ""
  //usage:#define resize_full_usage "\n\n"
  //usage:       "Resize the screen"
  
  #include "libbb.h"
  
  #define ESC "\033"
  
  #define old_termios_p ((struct termios*)&bb_common_bufsiz1)
  
  static void
  onintr(int sig UNUSED_PARAM)
  {
  	tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
  	_exit(EXIT_FAILURE);
  }
  
  int resize_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
  int resize_main(int argc UNUSED_PARAM, char **argv UNUSED_PARAM)
  {
  	struct termios new;
  	struct winsize w = { 0, 0, 0, 0 };
  	int ret;
  
  	/* We use _stderr_ in order to make resize usable
  	 * in shell backticks (those redirect stdout away from tty).
  	 * NB: other versions of resize open "/dev/tty"
  	 * and operate on it - should we do the same?
  	 */
  
  	tcgetattr(STDERR_FILENO, old_termios_p); /* fiddle echo */
  	memcpy(&new, old_termios_p, sizeof(new));
  	new.c_cflag |= (CLOCAL | CREAD);
  	new.c_lflag &= ~(ICANON | ECHO | ECHOE | ISIG);
  	bb_signals(0
  		+ (1 << SIGINT)
  		+ (1 << SIGQUIT)
  		+ (1 << SIGTERM)
  		+ (1 << SIGALRM)
  		, onintr);
  	tcsetattr(STDERR_FILENO, TCSANOW, &new);
  
  	/* save_cursor_pos 7
  	 * scroll_whole_screen [r
  	 * put_cursor_waaaay_off [$x;$yH
  	 * get_cursor_pos [6n
  	 * restore_cursor_pos 8
  	 */
  	fprintf(stderr, ESC"7" ESC"[r" ESC"[999;999H" ESC"[6n");
  	alarm(3); /* Just in case terminal won't answer */
  //BUG: death by signal won't restore termios
  	scanf(ESC"[%hu;%huR", &w.ws_row, &w.ws_col);
  	fprintf(stderr, ESC"8");
  
  	/* BTW, other versions of resize recalculate w.ws_xpixel, ws.ws_ypixel
  	 * by calculating character cell HxW from old values
  	 * (gotten via TIOCGWINSZ) and recomputing *pixel values */
  	ret = ioctl(STDERR_FILENO, TIOCSWINSZ, &w);
  
  	tcsetattr(STDERR_FILENO, TCSANOW, old_termios_p);
  
  	if (ENABLE_FEATURE_RESIZE_PRINT)
  		printf("COLUMNS=%d;LINES=%d;export COLUMNS LINES;\n",
  			w.ws_col, w.ws_row);
  
  	return ret;
  }
  