adds a few setmalloctag to debug programs using images and fonts.
defines a few keys in keyboard.h, like Esc, Del, etc..
Nothing serious :-)

Reference: /n/sources/patch/applied/drawmalloctagsandkeys
Date: Wed Nov  9 18:42:03 CET 2005

--- /sys/src/libdraw/alloc.c	Wed Nov  9 18:40:03 2005
+++ /sys/src/libdraw/alloc.c	Wed Nov  9 18:40:00 2005
@@ -5,7 +5,12 @@
 Image*
 allocimage(Display *d, Rectangle r, ulong chan, int repl, ulong val)
 {
-	return _allocimage(nil, d, r, chan, repl, val, 0, 0);
+	Image*	i;
+
+	i =  _allocimage(nil, d, r, chan, repl, val, 0, 0);
+	if (i)
+		setmalloctag(i, getcallerpc(&d));
+	return i;
 }
 
 Image*
--- /sys/src/libdraw/creadimage.c	Wed Nov  9 18:40:15 2005
+++ /sys/src/libdraw/creadimage.c	Wed Nov  9 18:40:12 2005
@@ -58,6 +58,7 @@
 		if(dolock)
 			lockdisplay(d);
 		i = allocimage(d, r, chan, 0, 0);
+		setmalloctag(i, getcallerpc(&d));
 		if(dolock)
 			unlockdisplay(d);
 		if(i == nil)
--- /sys/src/libdraw/getsubfont.c	Wed Nov  9 18:40:31 2005
+++ /sys/src/libdraw/getsubfont.c	Wed Nov  9 18:40:28 2005
@@ -32,5 +32,6 @@
 	if(f == 0)
 		fprint(2, "getsubfont: can't read %s: %r\n", name);
 	close(fd);
+	setmalloctag(f, getcallerpc(&d));
 	return f;
 }
--- /sys/include/keyboard.h	Wed Nov  9 18:40:48 2005
+++ /sys/include/keyboard.h	Wed Nov  9 18:40:46 2005
@@ -38,4 +38,9 @@
 	Kalt=		KF|0x15,
 	Kshift=	KF|0x16,
 	Kctl=		KF|0x17,
+
+	Kbs = 0x08,
+	Kdel= 0x7f,
+	Kesc= 0x1b,
+	Keof= 0x04,
 };