diff -r 595ed1a4447c dwm.c
--- a/dwm.c	Tue Apr 08 11:49:35 2008 +0100
+++ b/dwm.c	Sun Apr 20 17:44:51 2008 +0200
@@ -231,11 +231,12 @@ Atom wmatom[WMLast], netatom[NetLast];
 Atom wmatom[WMLast], netatom[NetLast];
 Bool otherwm, readin;
 Bool running = True;
-Bool *prevtags;
-Bool *seltags;
 Client *clients = NULL;
 Client *sel = NULL;
+Bool *seltags;
 Client *stack = NULL;
+Bool *viewtags[2];
+int viewtags_set = 0;
 Cursor cursor[CurLast];
 Display *dpy;
 DC dc = {0};
@@ -246,7 +247,6 @@ Window root, barwin;
 /* configuration, allows nested code to access above variables */
 #include "config.h"
 #define TAGSZ (LENGTH(tags) * sizeof(Bool))
-static Bool tmp[LENGTH(tags)];
 
 /* function implementations */
 
@@ -1162,11 +1162,10 @@ quit(const char *arg) {
 
 void
 reapply(const char *arg) {
-	static Bool zerotags[LENGTH(tags)] = { 0 };
 	Client *c;
 
 	for(c = clients; c; c = c->next) {
-		memcpy(c->tags, zerotags, sizeof zerotags);
+		memset(c->tags, 0, TAGSZ);
 		applyrules(c);
 	}
 	arrange();
@@ -1515,9 +1514,10 @@ setup(void) {
 		XSetFont(dpy, dc.gc, dc.font.xfont->fid);
 
 	/* init tags */
-	seltags = emallocz(TAGSZ);
-	prevtags = emallocz(TAGSZ);
-	seltags[0] = prevtags[0] = True;
+	viewtags[0] = emallocz(TAGSZ);
+	viewtags[1] = emallocz(TAGSZ);
+	viewtags[0][0] = viewtags[1][0] = True;
+	seltags = viewtags[0];
 
 	/* init layouts */
 	lt = &layouts[0];
@@ -1842,9 +1842,9 @@ updatewmhints(Client *c) {
 	}
 }
 
-
 void
 view(const char *arg) {
+	Bool tmp[LENGTH(tags)];
 	unsigned int i;
 
 	for(i = 0; i < LENGTH(tags); i++)
@@ -1852,7 +1852,7 @@ view(const char *arg) {
 	tmp[idxoftag(arg)] = True;
 
 	if(memcmp(seltags, tmp, TAGSZ) != 0) {
-		memcpy(prevtags, seltags, TAGSZ);
+		seltags = viewtags[viewtags_set ^= 1];  /* toggle tagset */
 		memcpy(seltags, tmp, TAGSZ);
 		arrange();
 	}
@@ -1860,10 +1860,8 @@ view(const char *arg) {
 
 void
 viewprevtag(const char *arg) {
+	seltags = viewtags[viewtags_set ^= 1];  /* toggle tagset */
 
-	memcpy(tmp, seltags, TAGSZ);
-	memcpy(seltags, prevtags, TAGSZ);
-	memcpy(prevtags, tmp, TAGSZ);
 	arrange();
 }