Change user and group

When enter is pressed, passwd[len] will be set to '\0'. Pressing
backspace is supposed to remove the last entered character.

But currently, the clearing has an off-by-one, as in setting
passwd[len] to '\0' just like enter would do.

You can also verify it by imagining len=1 and that it's impossible to
clear passwd[0] by pressing backspace with the current code.

Signed-off-by: Tobias Stoeckmann <tobias@stoeckmann.org>

README

@@ -1,6 +1,6 @@
 slock - simple screen locker
 ============================
-simple screen locker utility for X. 
+simple screen locker utility for X.
 
 
 Requirements

config.def.h

@@ -1,6 +1,6 @@
 /* user and group to drop privileges to */
-static const char *user  = "nobody";
+static const char *user  = "krrish";
-static const char *group = "nogroup";
+static const char *group = "krrish";
 
 static const char *colorname[NUMCOLS] = {
 	[INIT] =   "black",     /* after initialization */

config.h

@@ -0,0 +1,12 @@
+/* user and group to drop privileges to */
+static const char *user  = "krrish";
+static const char *group = "krrish";
+
+static const char *colorname[NUMCOLS] = {
+	[INIT] =   "black",     /* after initialization */
+	[INPUT] =  "#005577",   /* during input */
+	[FAILED] = "#CC3333",   /* wrong password */
+};
+
+/* treat a cleared input like a wrong password (color) */
+static const int failonclear = 1;

slock.c

@@ -177,7 +177,7 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 				break;
 			case XK_BackSpace:
 				if (len)
-					passwd[len--] = '\0';
+					passwd[--len] = '\0';
 				break;
 			default:
 				if (num && !iscntrl((int)buf[0]) &&
@@ -201,13 +201,21 @@ readpw(Display *dpy, struct xrandr *rr, struct lock **locks, int nscreens,
 			rre = (XRRScreenChangeNotifyEvent*)&ev;
 			for (screen = 0; screen < nscreens; screen++) {
 				if (locks[screen]->win == rre->window) {
-					XResizeWindow(dpy, locks[screen]->win,
+					if (rre->rotation == RR_Rotate_90 ||
-					              rre->width, rre->height);
+					    rre->rotation == RR_Rotate_270)
+						XResizeWindow(dpy, locks[screen]->win,
+						              rre->height, rre->width);
+					else
+						XResizeWindow(dpy, locks[screen]->win,
+						              rre->width, rre->height);
 					XClearWindow(dpy, locks[screen]->win);
+					break;
 				}
 			}
-		} else for (screen = 0; screen < nscreens; screen++)
+		} else {
-			XRaiseWindow(dpy, locks[screen]->win);
+			for (screen = 0; screen < nscreens; screen++)
+				XRaiseWindow(dpy, locks[screen]->win);
+		}
 	}
 }