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mkvdump: print element size if debugging enabled (-d)

--- a/extra/mkvdump.c

+++ b/extra/mkvdump.c

@@ -7,7 +7,7 @@

 static void

 usage(void)

 {

-	fprint(2, "usage: %s [file.mkv]\n", argv0);

+	fprint(2, "usage: %s [-d] [-h hxsz] [file.mkv]\n", argv0);

 	exits("usage");

 }

@@ -14,7 +14,7 @@

 void

 main(int argc, char **argv)

 {

-	int n, sti, i, hxsz, lacing, fd;

+	int n, sti, i, hxsz, lacing, fd, debug;

 	vlong sz, off, x;

 	uchar *b, t[3];

 	Biobuf in, out;

@@ -22,8 +22,12 @@

 	double d;

 	Tm tm;

+	debug = 0;

 	hxsz = 32;

 	ARGBEGIN{

+	case 'd':

+		debug++;

+		break;

 	case 'h':

 		if((hxsz = atoi(EARGF(usage()))) > 0)

 			break;

@@ -62,6 +66,8 @@

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

 				Bputc(&out, '\t');

 			Bprint(&out, "%s ", s.name);

+			if(debug)

+				Bprint(&out, " (%zd bytes) ", sz);

 			if(s.type == Emaster && sti < nelem(stack))

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

 		}else{