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diff --git a/test/back_ground.c b/test/back_ground.c
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+/****************************************************************************
+ * Copyright 2021 Thomas E. Dickey *
+ * *
+ * 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: back_ground.c,v 1.5 2021/02/20 12:23:21 tom Exp $
+ */
+
+#include <test.priv.h>
+
+#if USE_WIDEC_SUPPORT
+
+#define NEED_COLOR_CODE 1
+#define NEED_COLOR_NAME 1
+#include <color_name.h>
+#include <dump_window.h>
+
+static int default_bg = COLOR_BLACK;
+static int default_fg = COLOR_WHITE;
+static wchar_t wide_fill = L' ';
+
+static wchar_t
+decode_wchar(const char *value)
+{
+ long result;
+ char *next = NULL;
+ int radix = 0;
+
+ if (!strncmp(value, "U+", 2)) {
+ value += 2;
+ radix = 16;
+ }
+ result = strtol(value, &next, radix);
+ if (next == value || (next == NULL || *next != '\0')) {
+ fprintf(stderr, "decoding wchar_t: %s\n", value);
+ exit(EXIT_FAILURE);
+ }
+ return (wchar_t) result;
+}
+
+static void
+test_background(void)
+{
+ NCURSES_COLOR_T f, b;
+ int row;
+ int chr;
+ wchar_t blank[2];
+ wchar_t graphics[2];
+ cchar_t data;
+
+ 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);
+ }
+ dump_window(stdscr);
+
+ blank[0] = wide_fill;
+ blank[1] = L'\0';
+
+ printw("Initializing pair 1 to red/%s\n", color_name(default_bg));
+ init_pair(1, COLOR_RED, (NCURSES_COLOR_T) default_bg);
+ setcchar(&data, blank, A_NORMAL, 1, NULL);
+ bkgrndset(&data);
+ printw("RED/BLACK\n");
+ dump_window(stdscr);
+
+ printw("Initializing pair 2 to %s/blue\n", color_name(default_fg));
+ init_pair(2, (NCURSES_COLOR_T) default_fg, COLOR_BLUE);
+ setcchar(&data, blank, A_NORMAL, 2, NULL);
+ bkgrndset(&data);
+ printw("This line should be %s/blue\n", color_name(default_fg));
+ dump_window(stdscr);
+
+ 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");
+ graphics[0] = ACS_HLINE & A_CHARTEXT;
+ graphics[1] = L'\0';
+ setcchar(&data, graphics, A_ALTCHARSET, 3, NULL);
+ bkgrndset(&data);
+ /*
+ * 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");
+ dump_window(stdscr);
+
+ setcchar(&data, blank, A_NORMAL, 0, NULL);
+ bkgrndset(&data);
+ printw("Default Colors\n");
+ dump_window(stdscr);
+
+ printw("Resetting colors to pair 1\n");
+ setcchar(&data, blank, A_NORMAL, 1, NULL);
+ bkgrndset(&data);
+ printw("This line should be red/%s\n", color_name(default_bg));
+ dump_window(stdscr);
+
+ printw("Setting screen to pair 0\n");
+ setcchar(&data, blank, A_NORMAL, 0, NULL);
+ bkgrndset(&data);
+ dump_window(stdscr);
+
+ printw("Setting screen to pair 1\n");
+ setcchar(&data, blank, A_NORMAL, 1, NULL);
+ bkgrndset(&data);
+ dump_window(stdscr);
+
+ printw("Setting screen to pair 2\n");
+ setcchar(&data, blank, A_NORMAL, 2, NULL);
+ bkgrndset(&data);
+ dump_window(stdscr);
+
+ printw("Setting screen to pair 3\n");
+ setcchar(&data, blank, A_NORMAL, 3, NULL);
+ bkgrndset(&data);
+ dump_window(stdscr);
+
+ printw("Setting screen to pair 0\n");
+ setcchar(&data, blank, A_NORMAL, 0, NULL);
+ bkgrndset(&data);
+ dump_window(stdscr);
+}
+
+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"
+ ," -l FILE log window-dumps to this file"
+ ," -w fill background with stipple pattern"
+ ," -W CODE fill background with this Unicode value"
+ };
+ 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:l:wW:")) != -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;
+ case 'l':
+ if (!open_dump(optarg))
+ usage();
+ break;
+ case 'w':
+ wide_fill = L'\u2591';
+ break;
+ case 'W':
+ wide_fill = decode_wchar(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();
+ close_dump();
+ ExitProgram(EXIT_SUCCESS);
+}
+
+#else
+int
+main(void)
+{
+ printf("This program requires the wide-curses library\n");
+ ExitProgram(EXIT_FAILURE);
+}
+#endif /* USE_WIDEC_SUPPORT */