+static _Bool has_utf8() /* {{{ */
+{
+# if HAVE_NCURSESW_NCURSES_H
+ if (!opt_utf8)
+ {
+ /* Automatically determine */
+ if (strcasecmp ("UTF-8", nl_langinfo (CODESET)) == 0)
+ opt_utf8 = 2;
+ else
+ opt_utf8 = 1;
+ }
+ return ((_Bool) (opt_utf8 - 1));
+# else
+ return (0);
+# endif
+} /* }}} _Bool has_utf8 */
+
+static int update_prettyping_graph (ping_context_t *ctx, /* {{{ */
+ double latency, unsigned int sequence)
+{
+ int color = OPING_RED;
+ char const *symbol = "!";
+ int symbolc = '!';
+ size_t hist_symbols_num;
+ size_t index_symbols;
+
+ int x_max;
+ int x_pos;
+
+ x_max = getmaxx (ctx->window);
+ x_pos = ((sequence - 1) % (x_max - 4)) + 2;
+
+ if (has_utf8())
+ {
+ hist_symbols_num = hist_symbols_utf8_num;
+ }
+ else {
+ hist_symbols_num = hist_symbols_acs_num;
+ }
+
+ if (latency >= 0.0)
+ {
+ double ratio;
+ size_t intensity;
+ size_t index_colors;
+
+ ratio = latency / PING_DEF_TTL;
+ if (ratio > 1) {
+ ratio = 1.0;
+ }
+
+ intensity = (size_t) ((ratio * hist_symbols_num
+ * hist_colors_num) - 1);
+
+ index_colors = intensity / hist_symbols_num;
+ assert (index_colors < hist_colors_num);
+
+ index_symbols = intensity % hist_symbols_num;
+ if (has_utf8())
+ {
+ color = hist_colors_utf8[index_colors];
+ symbol = hist_symbols_utf8[index_symbols];
+ }
+ else
+ {
+ color = hist_colors_acs[index_colors];
+ symbolc = hist_symbols_acs[index_symbols] | A_ALTCHARSET;
+ }
+ }
+ else /* if (!(latency >= 0.0)) */
+ wattron (ctx->window, A_BOLD);
+
+ wattron (ctx->window, COLOR_PAIR(color));
+ if (has_utf8())
+ {
+ mvwprintw (ctx->window,
+ /* y = */ 3,
+ /* x = */ x_pos,
+ symbol);
+ }
+ else {
+ mvwaddch (ctx->window,
+ /* y = */ 3,
+ /* x = */ x_pos,
+ symbolc);
+ }
+ wattroff (ctx->window, COLOR_PAIR(color));
+
+ /* Use negation here to handle NaN correctly. */
+ if (!(latency >= 0.0))
+ wattroff (ctx->window, A_BOLD);
+
+ wprintw (ctx->window, " ");
+ return (0);
+} /* }}} int update_prettyping_graph */
+