--- stack/stack.c	2002/02/05 23:00:42	1.33
+++ stack/stack.c	2002/02/05 23:26:46	1.34
@@ -255,7 +255,7 @@
 }
 
 /* Print newline. */
-extern void nl(environment *env)
+extern void nl()
 {
   printf("\n");
 }
@@ -489,7 +489,7 @@
       break;
     } 
     /* If symbol */
-    if((convert= sscanf(in_line, "%[^][ ;\n\r_]%[^\n\r]", temp, rest))) {
+    if((convert= sscanf(in_line, "%[^][ ;\n\r]%[^\n\r]", temp, rest))) {
 	push_sym(env, temp);
 	break;
     }
@@ -659,6 +659,32 @@
   }
 }
 
+/* Forgets a symbol (remove it from the hash table) */
+extern void forget(environment *env)
+{
+  char* sym_id;
+  stackitem *stack_head= env->head;
+  symbol **hash_entry, *temp;
+
+  if(stack_head==NULL || stack_head->item->type!=symb) {
+    printerr("Stack empty or not a symbol");
+    return;
+  }
+
+  sym_id= ((symbol*)(stack_head->item->content.ptr))->id;
+  toss(env);
+
+  hash_entry= hash(env->symbols, sym_id);
+  temp= *hash_entry;
+  *hash_entry= (*hash_entry)->next;
+  
+  if(temp->val!=NULL) {
+    free_val(temp->val);
+  }
+  free(temp->id);
+  free(temp);
+} 
+
 int main()
 {
   environment myenv;