From b09c46d2a501fbe5a937204b2ef0986d33fbe556 Mon Sep 17 00:00:00 2001
From: Giles Atkinson <“gatk555@gmail.com”>
Date: Sat, 5 Nov 2022 21:07:46 +0000
Subject: [PATCH] Allow string-valued parameters to XSPICE device models with
 no default. The code model then sees the value NULL.  Needed for the "family"
 parameter on logic models, used by automatic bridge insertion.

---
 src/xspice/mif/mif_inp2.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/xspice/mif/mif_inp2.c b/src/xspice/mif/mif_inp2.c
index bb603f78a..41f606b9a 100644
--- a/src/xspice/mif/mif_inp2.c
+++ b/src/xspice/mif/mif_inp2.c
@@ -568,8 +568,15 @@ MIF_INP2A (
         param_info = &(DEVices[type]->DEVpublic.param[i]);
 
         if(mdfast->param[i]->is_null) {
+            char* emessage;
+
             if(! param_info->has_default) {
-                LITERR("Parameter on model has no default");
+                if (param_info->type == MIF_STRING)
+                    continue;   // Allow NULL
+                emessage = tprintf("Parameter %s on model %s has no default",
+                                   param_info->name, mdfast->gen.GENmodName);
+                LITERR(emessage);
+                tfree(emessage);
                 gc_end();
                 return;
             } else if((param_info->is_array) && (! param_info->has_conn_ref)) {