Add a -c option which clears the history buffer using the new

CONS_CLRHIST ioctl.

PR:		27616
Reviewed by:	ru

2 files changed, 18 insertions, 5 deletions

diff --git a/usr.sbin/kbdcontrol/kbdcontrol.1 b/usr.sbin/kbdcontrol/kbdcontrol.1
index 460a50a..2197b9b 100644
--- a/usr.sbin/kbdcontrol/kbdcontrol.1
+++ b/usr.sbin/kbdcontrol/kbdcontrol.1
@@ -13,15 +13,15 @@
 .\"     @(#)kbdcontrol.1
 .\" $FreeBSD$
 .\"
-.Dd June 30, 1999
+.Dd May 24, 2001
 .Dt KBDCONTROL 1
-.Os FreeBSD
+.Os
 .Sh NAME
 .Nm kbdcontrol
 .Nd a utility for manipulating the syscons console driver
 .Sh SYNOPSIS
 .Nm
-.Op Fl dFKix
+.Op Fl cdFKix
 .Oo
 .Fl b
 .Ar duration . Ns Ar pitch | Ar belltype
@@ -97,6 +97,8 @@ Install keyboard map file from
 .Ar keymap_file .
 You may load the keyboard map file from a menu-driven command, 
 .Xr kbdmap 1 .
+.It Fl c
+Clear the history buffer.
 .It Fl d
 Dump the current keyboard map onto stdout.
 The output may be redirected to a file and can be loaded
diff --git a/usr.sbin/kbdcontrol/kbdcontrol.c b/usr.sbin/kbdcontrol/kbdcontrol.c
index 14ff0f3..b91e8b6 100644
--- a/usr.sbin/kbdcontrol/kbdcontrol.c
+++ b/usr.sbin/kbdcontrol/kbdcontrol.c
@@ -980,6 +980,14 @@ set_history(char *opt)
 		warn("setting history buffer size");
 }
 
+void
+clear_history()
+{
+
+	if (ioctl(0, CONS_CLRHIST) == -1)
+		warn("clear history buffer");
+}
+
 static char
 *get_kbd_type_name(int type)
 {
@@ -1079,7 +1087,7 @@ static void
 usage()
 {
 	fprintf(stderr, "%s\n%s\n%s\n",
-"usage: kbdcontrol [-dFKix] [-b  duration.pitch | [quiet.]belltype]",
+"usage: kbdcontrol [-cdFKix] [-b duration.pitch | [quiet.]belltype]",
 "                  [-r delay.repeat | speed] [-l mapfile] [-f # string]",
 "                  [-h size] [-k device] [-L mapfile]");
 	exit(1);
@@ -1091,11 +1099,14 @@ main(int argc, char **argv)
 {
 	int		opt;
 
-	while((opt = getopt(argc, argv, "b:df:h:iKk:Fl:L:r:x")) != -1)
+	while((opt = getopt(argc, argv, "b:cdf:h:iKk:Fl:L:r:x")) != -1)
 		switch(opt) {
 			case 'b':
 				set_bell_values(optarg);
 				break;
+			case 'c':
+				clear_history();
+				break;
 			case 'd':
 				print_keymap();
 				break;