$NetBSD: patch-af,v 1.1 2010/08/09 19:37:45 drochner Exp $

--- src/cmd/dr.c.orig	2009-04-17 20:24:09.000000000 +0000
+++ src/cmd/dr.c
@@ -36,7 +36,7 @@ static int
 cmd_dr_run( chain_t *chain, char *params[] )
 {
 	int dir = 1;
-	tap_register *r;
+	tap_register *r, *r1;
 
 	if (cmd_params( params ) < 1 || cmd_params( params ) > 2)
 		return -1;
@@ -68,7 +68,12 @@ cmd_dr_run( chain_t *chain, char *params
 			dir = 0;
 		else if (strcasecmp( params[1], "out" ) == 0)
 			dir = 1;
-		else {
+		else if (strcasecmp( params[1], "sync" ) == 0) {
+			r = chain->parts->parts[chain->active_part]->active_instruction->data_register->in;
+			r1 = chain->parts->parts[chain->active_part]->active_instruction->data_register->out;
+			memcpy(r->data, r1->data, r->len);
+			dir = 0;
+		} else {
 			unsigned int bit;
 			if (strspn(params[1], "01") != strlen(params[1])) {
 				return -1;
@@ -101,12 +106,13 @@ cmd_dr_help( void )
 {
 	printf( _(
 		"Usage: %s [DIR]\n"
-		"Usage: %s BITSTRING\n"
+		"Usage: %s BITSTRING | sync\n"
 		"Display input or output data register content or set current register.\n"
 		"\n"
 		"DIR           requested data register; possible values: 'in' for\n"
 		"              input and 'out' for output; default is 'out'\n"
 		"BITSTRING     set current data register with BITSTRING (e.g. 01010)\n"
+		"sync          set 'in' data register to the 'out' value\n"
 	), "dr", "dr" );
 }