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      1 /*	$NetBSD: colorbars.c,v 1.1 2012/06/06 00:13:36 christos Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2012 Nathanial Sloss <nathanialsloss (at) yahoo.com.au>
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     17  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     18  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     19  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     20  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     21  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     22  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     23  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     24  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     25  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     26  * POSSIBILITY OF SUCH DAMAGE.
     27  */
     28 #include <sys/cdefs.h>
     29 __RCSID("$NetBSD: colorbars.c,v 1.1 2012/06/06 00:13:36 christos Exp $");
     30 
     31 #include <curses.h>
     32 #include <stdio.h>
     33 #include <string.h>
     34 #include <err.h>
     35 #include <stdlib.h>
     36 
     37 int
     38 main(void)
     39 {
     40 	static struct colorInfo {
     41 		const char *name;
     42 		int color;
     43 	} colorInfo[] = {
     44 		{ "Black", COLOR_BLACK },
     45 		{ "Red", COLOR_RED },
     46 		{ "Green", COLOR_GREEN },
     47 		{ "Yellow", COLOR_YELLOW },
     48 		{ "Blue", COLOR_BLUE },
     49 		{ "Magenta", COLOR_MAGENTA },
     50 		{ "Cyan", COLOR_CYAN },
     51 		{ "White", COLOR_WHITE },
     52 	};
     53 	size_t lengths[__arraycount(colorInfo)];
     54 
     55 	static const size_t numcolors = __arraycount(colorInfo);
     56 	size_t labelwidth;
     57 
     58 	int colorOK;
     59 	int spacing, offsetx, labeloffsety, labeloffsetx;
     60 
     61 	if (!initscr())
     62 		errx(EXIT_FAILURE, "Cannot initialize curses");
     63 
     64 	colorOK = has_colors();
     65 	if (!colorOK) {
     66 		endwin();
     67 		errx(EXIT_FAILURE, "Terminal cannot display color");
     68 	}
     69 
     70 	if (COLS < 45 || LINES < 10) {
     71 		endwin();
     72 		errx(EXIT_FAILURE, "Terminal size must be at least 45x10.");
     73 	}
     74 
     75 	spacing = COLS / numcolors;
     76 	offsetx = (COLS - (spacing * numcolors)) / 2;
     77 
     78 
     79 	start_color();
     80 
     81 	labelwidth = 0;
     82 	for (size_t i = 0; i < numcolors; i++) {
     83 		lengths[i] = strlen(colorInfo[i].name);
     84 		if (lengths[i] > labelwidth)
     85 			labelwidth = lengths[i];
     86 		init_pair(i, COLOR_WHITE, colorInfo[i].color);
     87 	}
     88 
     89 	labeloffsetx = spacing / 2;
     90 	labeloffsety = (LINES - 1 - labelwidth) / 2;
     91 	clear();
     92 
     93 	move(0, 0);
     94 
     95 	for (size_t i = 0; i < numcolors; i++) {
     96 		int xoffs = offsetx + spacing * i;
     97 
     98 		attrset(COLOR_PAIR(i));
     99 
    100 		for (int line = 0; line < LINES - 1; line++)
    101 			for (int xpos = 0; xpos < spacing; xpos++)
    102 			       mvprintw(line, xoffs + xpos, " ");
    103 
    104 		attrset(COLOR_PAIR(0));
    105 
    106 		xoffs += labeloffsetx;
    107 		for (size_t line = 0; line < lengths[i]; line++)
    108 			mvprintw(line + labeloffsety, xoffs, "%c",
    109 			    colorInfo[i].name[line]);
    110 	}
    111 
    112 	attrset(COLOR_PAIR(0));
    113 
    114 	mvprintw(LINES - 1, 0, "ANSI Color chart - Press any key to exit: ");
    115 
    116 	refresh();
    117 
    118 	getch();
    119 
    120 	endwin();
    121 
    122 	return EXIT_SUCCESS;
    123 }
    124 
    125