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ebml: tree-like debug printout

--- a/ebml.c

+++ b/ebml.c

@@ -18,6 +18,7 @@

 };

 static Packet packets[256];

+static vlong stack[32];

 int

 ebmluintb(u8int *b, int sz, vlong *out)

@@ -289,12 +290,13 @@

 int

 ebmlrun(Biobuf *f)

 {

-	int isebml, npackets, i;

+	int isebml, npackets, i, sti;

 	vlong left, id, n, sz, bufsz, track, off, packetsz, x, endtracks;

 	uvlong ts, timestamp, timestampscale;

 	uchar *buf;

 	double duration;

 	Ebml e, te;

+	Element *el;

 	buf = nil;

 	bufsz = 0;

@@ -307,6 +309,7 @@

 	e.tracknum = -1;

 	duration = 0;

 	ts = 0;

+	sti = 0;

 	for(isebml = 0; left != 0;){

 		if(id == EBlockDuration)

 			te.blockdur *= timestampscale;

@@ -321,14 +324,20 @@

 			werrstr("invalid ebml: %r at %#zx", off);

 			goto err;

 		}

+		while(sti > 0 && off >= stack[sti-1])

+			sti--;

+		left -= n;

 		if(dflag > 1){

-			Element *el;

-			if((el = ebmlid2elem(id)) != nil)

-				Bprint(&stderr, "%#zux\t%s\t%zd\t%zd\n", off, el->name, sz, left);

+			if((el = ebmlid2elem(id)) != nil){

+				for(i = 0; i < sti; i++)

+					Bputc(&stderr, '\t');

+				Bprint(&stderr, "%s\n", el->name);

+				if(el->type == Emaster && sti < nelem(stack))

+					stack[sti++] = off+n+sz;

+			}

 			else

-				Bprint(&stderr, "%#zux\t%#llx\t%zd\t%zd\n", off, id, sz, left);

+				Bprint(&stderr, "%#llx\n", id);

 		}

-		left -= n;

 		if(id == EEBML){ /* EBML comes first */

 			if(isebml != 0){