Edit File: background.c
/**************************************************************************** * Copyright (c) 2003-2011,2012 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 1.13 2012/06/09 20:30:33 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) { short 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", f, b); } getch(); printw("Initializing pair 1 to red/%s\n", color_name(default_bg)); init_pair(1, COLOR_RED, (short) 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, (short) 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, (short) default_fg, COLOR_CYAN); printw("...and drawing a box which should be followed by lines\n"); bkgdset(ACS_HLINE | 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((chtype) ((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); }