patch: control-clear

Adds an additional configuration parameter, controlkeyclear. When set to
1, slock will no longer change to the failure color if a control key is
pressed while the buffer is empty. This is useful if, for example, you
wake your monitor up by pressing a control key and don't want to spoil
the detection of failed unlocking attempts.

2 files changed, 6 insertions, 2 deletions

diff --git a/config.def.h b/config.def.h
index 83e4887..3639e91 100644
--- a/config.def.h
+++ b/config.def.h
@@ -11,3 +11,6 @@ static const char *colorname[NUMCOLS] = {
 
 /* treat a cleared input like a wrong password (color) */
 static const int failonclear = 1;
+
+/* allow control key to trigger fail on clear */
+static const int controlkeyclear = 1;
diff --git a/slock.c b/slock.c
index d7956b9..0dd4e2d 100644
--- a/slock.c
+++ b/slock.c
@@ -190,8 +190,9 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 				caps = !caps;
 				break;
 			default:
-				if (num && !iscntrl((int)buf[0]) &&
-				    (len + num < sizeof(passwd))) {
+				if (controlkeyclear && iscntrl((int)buf[0]))
+					continue;
+				if (num && (len + num < sizeof(passwd))) {
 					memcpy(passwd + len, buf, num);
 					len += num;
 				}