contrib/bsddialog: import 1.1vendor/bsddialog/1.1vendor/bsddialog

Add: slider dialog.
Imported to enable testing and to complete the geomman(8) utility.

Developed as part of the "Full Disk Administration Tool for FreeBSD"
project, Braulio Rivas (brauliorivas@), Google Summer of Code 2025.

Sponsored by:	Google LLC (GSoC 2025)

2 files changed, 45 insertions, 1 deletions

diff --git a/examples_library/compile b/examples_library/compile
index 1a68313090f6..b5e08f740784 100755
--- a/examples_library/compile
+++ b/examples_library/compile
@@ -12,7 +12,7 @@ set -x
 
 libpath=../lib
 examples="menu checklist radiolist mixedlist theme infobox yesno msgbox \
-datebox form timebox rangebox pause calendar gauge mixedgauge textbox"
+datebox form timebox rangebox pause calendar gauge mixedgauge textbox slider"
 
 rm -f $examples
 
diff --git a/examples_library/slider.c b/examples_library/slider.c
new file mode 100644
index 000000000000..2292f0e8efed
--- /dev/null
+++ b/examples_library/slider.c
@@ -0,0 +1,44 @@
+/*-
+ * SPDX-License-Identifier: CC0-1.0
+ *
+ * Written in 2025 by Alfonso Sabato Siciliano.
+ * To the extent possible under law, the author has dedicated all copyright
+ * and related and neighboring rights to this software to the public domain
+ * worldwide. This software is distributed without any warranty, see:
+ *   <http://creativecommons.org/publicdomain/zero/1.0/>.
+ */
+
+#include <bsddialog.h>
+#include <stdio.h>
+
+int main()
+{
+	int output;
+	unsigned long start, end, blocks[2][2];
+	struct bsddialog_conf conf;
+
+	start = 20;
+	end = 70;
+	blocks[0][0] = 5;
+	blocks[0][1] = 10;
+	blocks[1][0] = 80;
+	blocks[1][1] = 90;
+
+	if (bsddialog_init() == BSDDIALOG_ERROR) {
+		printf("Error: %s\n", bsddialog_geterror());
+		return (1);
+	}
+	bsddialog_initconf(&conf);
+	conf.title = "slider";
+
+	output = bsddialog_slider(&conf, "Example", 0, 0, "GiB", 100, &start,
+	    &end, false, 2, blocks);
+	bsddialog_end();
+	if (output == BSDDIALOG_ERROR) {
+		printf("Error: %s\n", bsddialog_geterror());
+		return (1);
+	}
+	printf("Start: %lu, End: %lu\n", start, end);
+
+	return (0);
+}