Author: Jan Christoph Ebersbach <jceb@e-jc.de>
URL: http://dwm.suckless.org/patches/historical/moveresize
These patches provide helper functions for moving and resizing floating windows
using keybindings.

diff -r ec4baab78314 moveresize.c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/moveresize.c	Fri Apr 06 08:23:15 2012 +0200
@@ -0,0 +1,64 @@
+void
+moveresize(const Arg *arg) {
+	/* only floating windows can be moved */
+	Client *c;
+	c = selmon->sel;
+	int x, y, w, h, nx, ny, nw, nh, ox, oy, ow, oh;
+	char xAbs, yAbs, wAbs, hAbs;
+	int msx, msy, dx, dy, nmx, nmy;
+	unsigned int dui;
+	Window dummy;
+
+	if (!c || !arg)
+		return;
+	if (selmon->lt[selmon->sellt]->arrange && !c->isfloating)
+		return;
+	if(sscanf((char *)arg->v, "%d%c %d%c %d%c %d%c", &x, &xAbs, &y, &yAbs, &w, &wAbs, &h, &hAbs) != 8)
+		return;
+	/* compute new window position; prevent window from be positioned outside the current monitor */
+	nw = c->w + w;
+	if(wAbs == 'W')
+		nw = w < selmon->mw - 2 * c->bw ? w : selmon->mw - 2 * c->bw;
+
+	nh = c->h + h;
+	if(hAbs == 'H')
+		nh = h < selmon->mh - 2 * c->bw ? h : selmon->mh - 2 * c->bw;
+
+	nx = c->x + x;
+	if(xAbs == 'X') {
+		if(x < selmon->mx)
+			nx = selmon->mx;
+		else if(x > selmon->mx + selmon->mw)
+			nx = selmon->mx + selmon->mw - nw - 2 * c->bw;
+		else
+			nx = x;
+	}
+
+	ny = c->y + y;
+	if(yAbs == 'Y') {
+		if(y < selmon->my)
+			ny = selmon->my;
+		else if(y > selmon->my + selmon->mh)
+			ny = selmon->my + selmon->mh - nh - 2 * c->bw;
+		else
+			ny = y;
+	}
+
+	ox = c->x;
+	oy = c->y;
+	ow = c->w;
+	oh = c->h;
+
+	XRaiseWindow(dpy, c->win);
+	Bool xqp = XQueryPointer(dpy, root, &dummy, &dummy, &msx, &msy, &dx, &dy, &dui);
+	resize(c, nx, ny, nw, nh, True);
+
+	/* move cursor along with the window to avoid problems caused by the sloppy focus */
+	if (xqp && ox <= msx && (ox + ow) >= msx && oy <= msy && (oy + oh) >= msy)
+	{
+		nmx = c->x - ox + c->w - ow;
+		nmy = c->y - oy + c->h - oh;
+		XWarpPointer(dpy, None, None, 0, 0, 0, 0, nmx, nmy);
+	}
+}
+