X-Git-Url: https://review.openocd.org/gitweb?a=blobdiff_plain;f=src%2Fjtag%2Ftcl.c;h=dd2be1e5ad3f58e06794d5440841d559704aaf16;hb=5f9c59409b193c3f3f1408db43ad7d05e004d687;hp=3f63ffc15ff8ece7f50b7f8f3b8e2ce66add9ca1;hpb=517ba0690dcc9e859a05df2113ce32401a5ab254;p=openocd.git

diff --git a/src/jtag/tcl.c b/src/jtag/tcl.c
index 3f63ffc15f..dd2be1e5ad 100644
--- a/src/jtag/tcl.c
+++ b/src/jtag/tcl.c
@@ -59,8 +59,6 @@ static const Jim_Nvp nvp_jtag_tap_event[] = {
 	{ .name = NULL, .value = -1 }
 };
 
-extern struct jtag_interface *jtag_interface;
-
 struct jtag_tap *jtag_tap_by_jim_obj(Jim_Interp *interp, Jim_Obj *o)
 {
 	const char *cp = Jim_GetString(o, NULL);
@@ -171,7 +169,10 @@ static int Jim_Command_drscan(Jim_Interp *interp, int argc, Jim_Obj *const *args
 		return JIM_ERR;
 
 	num_fields = (argc-2)/2;
-	assert(num_fields > 0);
+	if (num_fields <= 0) {
+		Jim_SetResultString(interp, "drscan: no scan fields supplied", -1);
+		return JIM_ERR;
+	}
 	fields = malloc(sizeof(struct scan_field) * num_fields);
 	for (i = 2; i < argc; i += 2) {
 		long bits;