made Layout a static struct in layout.c, added some convenience getters in layout.c, now lt->arrange accesses are not possible anymore, arrange() is the super-arrange function which sets up all layouts

client.c

@@ -230,13 +230,14 @@ manage(Window w, XWindowAttributes *wa) {
 	setclientstate(c, IconicState);
 	c->isbanned = True;
 	focus(c);
-	lt->arrange();
+	arrange();
 }
 
 void
 resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
 	double dx, dy, max, min, ratio;
 	XWindowChanges wc; 
+
 	if(sizehints) {
 		if(c->minay > 0 && c->maxay > 0 && (h - c->baseh) > 0 && (w - c->basew) > 0) {
 			dx = (double)(w - c->basew);
@@ -297,12 +298,12 @@ resize(Client *c, int x, int y, int w, int h, Bool sizehints) {
 
 void
 togglefloating(const char *arg) {
-	if(!sel || lt->arrange == floating)
+	if(!sel || isfloating())
 		return;
 	sel->isfloating = !sel->isfloating;
 	if(sel->isfloating)
 		resize(sel, sel->x, sel->y, sel->w, sel->h, True);
-	lt->arrange();
+	arrange();
 }
 
 void
@@ -334,7 +335,7 @@ unmanage(Client *c) {
 	XSync(dpy, False);
 	XSetErrorHandler(xerror);
 	XUngrabServer(dpy);
-	lt->arrange();
+	arrange();
 }
 
 void

config.mk

@@ -20,8 +20,8 @@ LIBS = -L/usr/lib -lc -L${X11LIB} -lX11
 # flags
 CFLAGS = -Os ${INCS} -DVERSION=\"${VERSION}\"
 LDFLAGS = -s ${LIBS}
-CFLAGS = -g -Wall -O2 ${INCS} -DVERSION=\"${VERSION}\"
-LDFLAGS = -g ${LIBS}
+#CFLAGS = -g -Wall -O2 ${INCS} -DVERSION=\"${VERSION}\"
+#LDFLAGS = -g ${LIBS}
 
 # Solaris
 #CFLAGS = -fast ${INCS} -DVERSION=\"${VERSION}\"

draw.c

@@ -66,7 +66,7 @@ drawstatus(void) {
 		dc.x += dc.w;
 	}
 	dc.w = blw;
-	drawtext(lt->symbol, dc.norm);
+	drawtext(getsymbol(), dc.norm);
 	x = dc.x + dc.w;
 	dc.w = textw(stext);
 	dc.x = sw - dc.w;

dwm.h

@@ -74,11 +74,6 @@ typedef struct {
 	} font;
 } DC; /* draw context */
 
-typedef struct {
-	const char *symbol;
-	void (*arrange)(void);
-} Layout;
-
 extern const char *tags[];			/* all tags */
 extern char stext[256];				/* status text */
 extern int screen, sx, sy, sw, sh;		/* screen geometry */
@@ -92,7 +87,6 @@ extern Client *clients, *sel, *stack;		/* global client list and stack */
 extern Cursor cursor[CurLast];
 extern DC dc;					/* global draw context */
 extern Display *dpy;
-extern Layout *lt;
 extern Window root, barwin;
 
 /* client.c */
@@ -120,8 +114,11 @@ unsigned int textw(const char *text);	/* return the width of text in px*/
 void grabkeys(void);			/* grab all keys defined in config.h */
 
 /* layout.c */
-void floating(void);			/* arranges all windows floating, fallback layout  */
+void arrange(void);			/* arranges all windows depending on the layout in use */
 void focusclient(const char *arg);	/* focuses next(1)/previous(-1) visible client */
+const char *getsymbol(void);		/* returns True  symbol of enabled layout */
+Bool isfloating(void);			/* returns True if floating layout is enabled */
+Bool isarrange(void (*func)());		/* returns True if func is the layout function in use */
 void initlayouts(void);			/* initialize layout array */
 Client *nexttiled(Client *c);		/* returns tiled successor of c */
 void restack(void);			/* restores z layers of all clients */

event.c

@@ -145,14 +145,14 @@ buttonpress(XEvent *e) {
 		focus(c);
 		if(CLEANMASK(ev->state) != MODKEY)
 			return;
-		if(ev->button == Button1 && (lt->arrange == floating || c->isfloating)) {
+		if(ev->button == Button1 && (isfloating() || c->isfloating)) {
 			restack();
 			movemouse(c);
 		}
 		else if(ev->button == Button2)
 			zoom(NULL);
 		else if(ev->button == Button3
-		&& (lt->arrange == floating || c->isfloating) && !c->isfixed)
+		&& (isfloating() || c->isfloating) && !c->isfixed)
 		{
 			restack();
 			resizemouse(c);
@@ -170,7 +170,7 @@ configurerequest(XEvent *e) {
 		c->ismax = False;
 		if(ev->value_mask & CWBorderWidth)
 			c->border = ev->border_width;
-		if(c->isfixed || c->isfloating || (lt->arrange == floating)) {
+		if(c->isfixed || c->isfloating || isfloating()) {
 			if(ev->value_mask & CWX)
 				c->x = ev->x;
 			if(ev->value_mask & CWY)
@@ -216,7 +216,7 @@ configurenotify(XEvent *e) {
 		dc.drawable = XCreatePixmap(dpy, root, sw, bh, DefaultDepth(dpy, screen));
 		XResizeWindow(dpy, barwin, sw, bh);
 		updatebarpos();
-		lt->arrange();
+		arrange();
 	}
 }
 
@@ -317,7 +317,7 @@ propertynotify(XEvent *e) {
 			case XA_WM_TRANSIENT_FOR:
 				XGetTransientForHint(dpy, c->win, &trans);
 				if(!c->isfloating && (c->isfloating = (getclient(trans) != NULL)))
-					lt->arrange();
+					arrange();
 				break;
 			case XA_WM_NORMAL_HINTS:
 				updatesizehints(c);

layout.c

@@ -2,11 +2,25 @@
 #include "dwm.h"
 #include <stdlib.h>
 
+typedef struct {
+	const char *symbol;
+	void (*arrange)(void);
+} Layout;
+
 unsigned int blw = 0;
-Layout *lt = NULL;
+static Layout *lt = NULL;
 
 /* static */
 
+static void
+floating(void) {
+	Client *c;
+
+	for(c = clients; c; c = c->next)
+		if(isvisible(c))
+			resize(c, c->x, c->y, c->w, c->h, True);
+}
+
 static unsigned int nlayouts = 0;
 
 LAYOUTS
@@ -14,19 +28,15 @@ LAYOUTS
 /* extern */
 
 void
-floating(void) {
+arrange(void) {
 	Client *c;
 
-	if(lt->arrange != floating)
-		return;
-
 	for(c = clients; c; c = c->next)
-		if(isvisible(c)) {
+		if(isvisible(c))
 			unban(c);
-			resize(c, c->x, c->y, c->w, c->h, True);
-		}
 		else
 			ban(c);
+	lt->arrange();
 	focus(NULL);
 	restack();
 }
@@ -55,6 +65,23 @@ focusclient(const char *arg) {
 	}
 }
 
+const char *
+getsymbol(void)
+{
+	return lt->symbol;
+}
+
+Bool
+isfloating(void) {
+	return lt->arrange == floating;
+}
+
+Bool
+isarrange(void (*func)())
+{
+	return func == lt->arrange;
+}
+
 void
 initlayouts(void) {
 	unsigned int i, w;
@@ -119,7 +146,7 @@ setlayout(const char *arg) {
 		lt = &layout[i];
 	}
 	if(sel)
-		lt->arrange();
+		arrange();
 	else
 		drawstatus();
 }
@@ -131,7 +158,7 @@ togglebar(const char *arg) {
 	else
 		bpos = BarOff;
 	updatebarpos();
-	lt->arrange();
+	arrange();
 }
 
 void

tag.c

@@ -110,7 +110,7 @@ tag(const char *arg) {
 	i = arg ? atoi(arg) : 0;
 	if(i >= 0 && i < ntags)
 		sel->tags[i] = True;
-	lt->arrange();
+	arrange();
 }
 
 void
@@ -124,7 +124,7 @@ toggletag(const char *arg) {
 	for(j = 0; j < ntags && !sel->tags[j]; j++);
 	if(j == ntags)
 		sel->tags[i] = True;
-	lt->arrange();
+	arrange();
 }
 
 void
@@ -136,7 +136,7 @@ toggleview(const char *arg) {
 	for(j = 0; j < ntags && !seltag[j]; j++);
 	if(j == ntags)
 		seltag[i] = True; /* cannot toggle last view */
-	lt->arrange();
+	arrange();
 }
 
 void
@@ -148,5 +148,5 @@ view(const char *arg) {
 	i = arg ? atoi(arg) : 0;
 	if(i >= 0 && i < ntags)
 		seltag[i] = True;
-	lt->arrange();
+	arrange();
 }

tile.c

@@ -12,7 +12,7 @@ void
 addtomwfact(const char *arg) {
 	double delta;
 
-	if(lt->arrange != tile)
+	if(isarrange(tile))
 		return;
 
 	/* arg handling, manipulate mwfact */
@@ -20,7 +20,7 @@ addtomwfact(const char *arg) {
 		if(delta + mwfact > 0.1 && delta + mwfact < 0.9)
 			mwfact += delta;
 	}
-	lt->arrange();
+	arrange();
 }
 
 void
@@ -41,7 +41,6 @@ tile(void) {
 	ny = way;
 	for(i = 0, c = clients; c; c = c->next)
 		if(isvisible(c)) {
-			unban(c);
 			if(c->isfloating)
 				continue;
 			c->ismax = False;
@@ -65,17 +64,13 @@ tile(void) {
 				ny += nh + 2 * c->border;
 			i++;
 		}
-		else
-			ban(c);
-	focus(NULL);
-	restack();
 }
 
 void
 zoom(const char *arg) {
 	Client *c;
 
-	if(!sel || lt->arrange == floating || sel->isfloating)
+	if(!sel || !isarrange(tile) || sel->isfloating)
 		return;
 	if((c = sel) == nexttiled(clients))
 		if(!(c = nexttiled(c->next)))
@@ -83,5 +78,5 @@ zoom(const char *arg) {
 	detach(c);
 	attach(c);
 	focus(c);
-	lt->arrange();
+	arrange();
 }