--- ray/src/hd/sm_list.c	1998/08/19 17:45:24	3.1
+++ ray/src/hd/sm_list.c	1998/12/28 18:07:35	3.4
@@ -24,8 +24,6 @@ LIST
 {
     LIST *l;
 
-
-
     /* check free list for available edges */
     if( free_lists )
     {
@@ -52,9 +50,6 @@ LIST *a,*b;
 {
     LIST * l;
 
-    if(!a)
-      return(b);
-
     if(!b)
        return(a);
     
@@ -67,6 +62,40 @@ LIST *a,*b;
     return(b);
 }
 
+/* attaches list a at the end of list b */
+LIST
+*add_data(l,d,end)
+LIST *l;
+int d;
+LIST **end;
+
+{
+    LIST *list,*lptr;
+
+    list = new_list();
+    SET_LIST_DATA(list,d);
+
+    if(!l)
+    {
+      if(end)
+	*end = list;
+      return(list);
+    }
+    if(end)
+      lptr = *end;
+    else
+    {
+      lptr = l;
+      while(LIST_NEXT(lptr))
+	lptr = LIST_NEXT(lptr);
+    }
+    LIST_NEXT(lptr) = list;
+    if(end)
+      *end = list;
+
+    return(l);
+}
+
 /* Adds data to the end of a circular list. If set, "end"
  * is a pointer to the last element in the list
  */
@@ -118,6 +147,7 @@ LIST * l;
 {
     if(!l)
        return(NULL);
+
     free_lists = append_list(free_lists,l);
 
     return(NULL);
@@ -131,7 +161,7 @@ pop_list(l)
 LIST **l;
 {
     LIST *p;
-    void *d;
+    int d;
     
     if(!l)
        return(NULL);