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+/****************************************************************************
+ * Copyright (c) 2018 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: parse_rgb.h,v 1.4 2018/02/03 23:40:53 tom Exp $
+ *
+ * Sample implementation of ncurses RGB extension from user_caps(5).
+ */
+#ifndef PARSE_RBG_H_incl
+#define PARSE_RBG_H_incl 1
+
+#include <test.priv.h>
+
+#if HAVE_TIGETSTR && USE_WIDEC_SUPPORT
+static int
+parse_rgb(int *r_max, int *g_max, int *b_max)
+{
+ int colors = tigetnum("colors");
+ int result = ERR;
+
+ *r_max = *g_max = *b_max = 0;
+
+ if (colors > 0) {
+ int max_bits;
+ int bits;
+ int pwr2;
+ int r = 0, g = 0, b = 0;
+ char *data;
+ char ch;
+
+ for (max_bits = 0, pwr2 = 1;
+ pwr2 < colors;
+ ++max_bits, pwr2 <<= 1) {
+ ;
+ }
+
+ if (tigetflag("RGB") > 0) {
+ result = OK;
+ r = g = b = (max_bits + 2) / 3;
+ } else if ((bits = tigetnum("RGB")) > 0) {
+ result = OK;
+ r = g = b = bits;
+ } else if ((data = tigetstr("RGB")) != ABSENT_STRING
+ && data != CANCELLED_STRING
+ && sscanf(data, "%d/%d/%d%c", &r, &g, &b, &ch) == 3) {
+ result = OK;
+ }
+
+ if ((r + g + b) < max_bits) {
+ result = ERR;
+ } else if (result == 0) {
+ if (r > max_bits) {
+ r = max_bits;
+ g = b = 0;
+ }
+ *r_max = r;
+ if (g > (max_bits -= r)) {
+ g = max_bits;
+ b = 0;
+ }
+ *g_max = g;
+ if (b > (max_bits -= g)) {
+ b = max_bits;
+ }
+ *b_max = b;
+ }
+ }
+ return result;
+}
+#else
+#define parse_rgb(r,g,b) (ERR)
+#endif
+
+#endif /* PARSE_RBG_H_incl */