Change CMPP-related struct Mif_Parse_Value to a union

as C99 allows initialisation of any member.  Also correct a comment
in miftypes.h.

src/include/ngspice/mifparse.h

@@ -47,21 +47,14 @@ NON-STANDARD FEATURES
 #include  "ngspice/miftypes.h"
 
 
-/*
- * Values of different types used by the parser.  Note that this is a structure
- * instead of a union because we need to do initializations in the ifspec.c files for
- * the models and unions cannot be initialized in any useful way in C
- *
- */
-
-struct Mif_Parse_Value {
+/* Values of different types used by the parser. */
 
+union Mif_Parse_Value {
     Mif_Boolean_t     bvalue;         /* For boolean values */
     int               ivalue;         /* For integer values */
     double            rvalue;         /* For real values */
     Mif_Complex_t     cvalue;         /* For complex values */
     char              *svalue;        /* For string values  */
-
 };
 
 

src/include/ngspice/miftypes.h

@@ -205,19 +205,19 @@ typedef struct Mif_Complex {
 
 typedef union {
 
-    Mif_Boolean_t  bvalue;         /* For digital node value */
+    Mif_Boolean_t  bvalue;         /* For boolean parameters */
     int            ivalue;         /* For integer parameters */
     double         rvalue;         /* For spice node values and real parameters */  
     Mif_Complex_t  cvalue;         /* For complex parameters */
-    char           *svalue;        /* For string parameters  */
-    void           *pvalue;        /* For user defined nodes */
+    char          *svalue;         /* For string parameters  */
+    void          *pvalue;         /* For Digital and user defined nodes */
 
 } Mif_Value_t;
 
 
 
 /* types from mifparse.h */
-typedef struct Mif_Parse_Value Mif_Parse_Value_t;
+typedef union Mif_Parse_Value Mif_Parse_Value_t;
 typedef struct Mif_Conn_Info Mif_Conn_Info_t;
 typedef struct Mif_Param_Info Mif_Param_Info_t;
 typedef struct Mif_Inst_Var_Info Mif_Inst_Var_Info_t;

src/xspice/cmpp/writ_ifs.c

@@ -719,7 +719,7 @@ static int write_param_info(
             p_param_cur->default_value_cnt = 0;
             continue;
         }
-        rc |= fprintf(fp, "static struct Mif_Parse_Value %s_default[] = {\n",
+        rc |= fprintf(fp, "static union Mif_Parse_Value %s_default[] = {\n",
                       p_param_cur->name);
 
         do {            // Write the default values for this parameter.
@@ -1270,20 +1270,20 @@ static char  *value_to_str(Data_Type_t type, Value_t value)
 
         case CMPP_BOOLEAN:
             bool_str = boolean_to_str(value.bvalue);
-            sprintf(str, "{%s, 0, 0.0, {0.0, 0.0}, NULL}", bool_str);
+            sprintf(str, "{ .bvalue=%s }", bool_str);
             break;
 
         case CMPP_INTEGER:
-            sprintf(str, "{MIF_FALSE, %d, 0.0, {0.0, 0.0}, NULL}", value.ivalue);
+            sprintf(str, "{ .ivalue=%d }", value.ivalue);
             break;
 
         case CMPP_REAL:
-            sprintf(str, "{MIF_FALSE, 0, %e, {0.0, 0.0}, NULL}", value.rvalue);
+            sprintf(str, "{ .rvalue=%e }", value.rvalue);
             break;
 
         case CMPP_COMPLEX:
-            sprintf(str, "{MIF_FALSE, 0, 0.0, {%e, %e}, NULL}",
-                                      value.cvalue.real, value.cvalue.imag);
+            sprintf(str, "{ .cvalue={%e, %e} }",
+                    value.cvalue.real, value.cvalue.imag);
             break;
 
         case CMPP_STRING:
@@ -1303,7 +1303,7 @@ static char  *value_to_str(Data_Type_t type, Value_t value)
                 max_len += str_len;
             } /* end of resize */
 
-            sprintf(str, "{MIF_FALSE, 0, 0.0, {0.0, 0.0}, \"%s\"}", value.svalue);
+            sprintf(str, "{ .svalue=\"%s\" }", value.svalue);
             break;
 
         default:
@@ -1338,8 +1338,5 @@ static char  *integer_to_str(int value)
 
 static const char *no_value_to_str(void)
 {
-    return "{MIF_FALSE, 0, 0.0, {0.0, 0.0}, NULL}";
+    return "{ .bvalue=MIF_FALSE }";
 }
-
-
-