text: /****************************************************************************
   * Copyright (c) 2003-2014,2017 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            *
   * "Software"), to deal in the Software without restriction, including      *
   * without limitation the rights to use, copy, modify, merge, publish,      *
   * distribute, distribute with modifications, sublicense, and/or sell       *
   * copies of the Software, and to permit persons to whom the Software is    *
   * furnished to do so, subject to the following conditions:                 *
   *                                                                          *
   * The above copyright notice and this permission notice shall be included  *
   * in all copies or substantial portions of the Software.                   *
   *                                                                          *
   * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS  *
   * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF               *
   * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.   *
   * IN NO EVENT SHALL THE ABOVE COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,   *
   * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR    *
   * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR    *
   * THE USE OR OTHER DEALINGS IN THE SOFTWARE.                               *
   *                                                                          *
   * Except as contained in this notice, the name(s) of the above copyright   *
   * holders shall not be used in advertising or otherwise to promote the     *
   * sale, use or other dealings in this Software without prior written       *
   * authorization.                                                           *
   ****************************************************************************/
  /*
   * $Id: background.c,v 1.17 2017/09/29 22:54:33 tom Exp $
   */
  
  #define NEED_COLOR_CODE 1
  #define NEED_COLOR_NAME 1
  #include <color_name.h>
  
  static int default_bg = COLOR_BLACK;
  static int default_fg = COLOR_WHITE;
  
  static void
  test_background(void)
  {
      NCURSES_COLOR_T f, b;
      int row;
      int chr;
  
      if (pair_content(0, &f, &b) == ERR) {
  	printw("pair 0 contains no data\n");
      } else {
  	printw("pair 0 contains (%d,%d)\n", (int) f, (int) b);
      }
      getch();
  
      printw("Initializing pair 1 to red/%s\n", color_name(default_bg));
      init_pair(1, COLOR_RED, (NCURSES_COLOR_T) default_bg);
      bkgdset((chtype) (' ' | COLOR_PAIR(1)));
      printw("RED/BLACK\n");
      getch();
  
      printw("Initializing pair 2 to %s/blue\n", color_name(default_fg));
      init_pair(2, (NCURSES_COLOR_T) default_fg, COLOR_BLUE);
      bkgdset((chtype) (' ' | COLOR_PAIR(2)));
      printw("This line should be %s/blue\n", color_name(default_fg));
      getch();
  
      printw("Initializing pair 3 to %s/cyan (ACS_HLINE)\n", color_name(default_fg));
      init_pair(3, (NCURSES_COLOR_T) default_fg, COLOR_CYAN);
      printw("...and drawing a box which should be followed by lines\n");
      bkgdset(ACS_HLINE | (chtype) COLOR_PAIR(3));
      /*
       * Characters from vt100 line-drawing should be mapped to line-drawing,
       * since A_ALTCHARSET is set in the background, and the character part
       * of the background is replaced by the nonblank characters written.
       *
       * Characters not in the line-drawing range are usually sent as-is.
       *
       * With SVr4 curses it is possible to rely on this to mix uppercase text
       * with the (lowercase) line-drawing characters.  ncurses uses some of
       * the uppercase characters for encoding thick- and double-lines.
       */
      row = 7;
      mvprintw(row++, 10, "l");
      for (chr = 0; chr < 32; ++chr)
  	AddCh(' ');
      printw("x\n");
      chr = 32;
      while (chr < 128) {
  	if ((chr % 32) == 0)
  	    mvprintw(row++, 10, "x");
  	AddCh((chr == 127) ? ' ' : chr);
  	if ((++chr % 32) == 0)
  	    printw("x\n");
      }
      mvprintw(row++, 10, "m");
      for (chr = 0; chr < 32; ++chr)
  	AddCh(' ');
      printw("j\n");
      getch();
  
      bkgdset((chtype) (' ' | COLOR_PAIR(0)));
      printw("Default Colors\n");
      getch();
  
      printw("Resetting colors to pair 1\n");
      bkgdset((chtype) (' ' | COLOR_PAIR(1)));
      printw("This line should be red/%s\n", color_name(default_bg));
      getch();
  
      printw("Setting screen to pair 0\n");
      bkgd((chtype) (' ' | COLOR_PAIR(0)));
      getch();
  
      printw("Setting screen to pair 1\n");
      bkgd((chtype) (' ' | COLOR_PAIR(1)));
      getch();
  
      printw("Setting screen to pair 2\n");
      bkgd((chtype) (' ' | COLOR_PAIR(2)));
      getch();
  
      printw("Setting screen to pair 3\n");
      bkgd((chtype) (' ' | COLOR_PAIR(3)));
      getch();
  
      printw("Setting screen to pair 0\n");
      bkgd((chtype) (' ' | COLOR_PAIR(0)));
      getch();
  }
  
  static void
  usage(void)
  {
      static const char *msg[] =
      {
  	"Usage: background [options]"
  	,""
  	,"Options:"
  #if HAVE_ASSUME_DEFAULT_COLORS
  	," -a       invoke assume_default_colors, repeat to use in init_pair"
  #endif
  	," -b XXX   specify background color"
  #if HAVE_USE_DEFAULT_COLORS
  	," -d       invoke use_default_colors, repeat to use in init_pair"
  #endif
  	," -f XXX   specify foreground color"
      };
      size_t n;
  
      for (n = 0; n < SIZEOF(msg); n++)
  	fprintf(stderr, "%s\n", msg[n]);
  
      ExitProgram(EXIT_FAILURE);
  }
  
  int
  main(int argc GCC_UNUSED, char *argv[]GCC_UNUSED)
  {
  #if HAVE_ASSUME_DEFAULT_COLORS
      int a_option = 0;
  #endif
  #if HAVE_USE_DEFAULT_COLORS
      int d_option = 0;
  #endif
      int n;
  
      setlocale(LC_ALL, "");
  
      while ((n = getopt(argc, argv, "ab:df:")) != -1) {
  	switch (n) {
  #if HAVE_ASSUME_DEFAULT_COLORS
  	case 'a':
  	    ++a_option;
  	    break;
  #endif
  	case 'b':
  	    default_bg = color_code(optarg);
  	    break;
  #if HAVE_USE_DEFAULT_COLORS
  	case 'd':
  	    ++d_option;
  	    break;
  #endif
  	case 'f':
  	    default_fg = color_code(optarg);
  	    break;
  	default:
  	    usage();
  	}
      }
  #if HAVE_USE_DEFAULT_COLORS && HAVE_ASSUME_DEFAULT_COLORS
      if (a_option && d_option) {
  	fprintf(stderr, "Use either -a or -d option, but not both\n");
  	ExitProgram(EXIT_FAILURE);
      }
  #endif
  
      initscr();
      cbreak();
      noecho();
  
      if (has_colors()) {
  	start_color();
  
  #if HAVE_USE_DEFAULT_COLORS
  	if (d_option) {
  	    printw("Using default colors...\n");
  	    use_default_colors();
  	    if (d_option > 1) {
  		default_fg = -1;
  		default_bg = -1;
  	    }
  	}
  #endif
  #if HAVE_ASSUME_DEFAULT_COLORS
  	if (a_option) {
  	    printw("Using assumed colors %s/%s...\n",
  		   color_name(default_fg),
  		   color_name(default_bg));
  	    assume_default_colors(default_fg, default_bg);
  	    if (a_option > 1) {
  		default_fg = -1;
  		default_bg = -1;
  	    }
  	}
  #endif
  
  	test_background();
  
      } else {
  	printw("This demo requires a color terminal");
  	getch();
      }
      endwin();
  
      ExitProgram(EXIT_SUCCESS);
  }
  