/**************************************************************************** * 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 #if USE_WIDEC_SUPPORT #define NEED_COLOR_CODE 1 #define NEED_COLOR_NAME 1 #include #include 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 */