--- stack/stack.c	2002/02/06 01:51:08	1.37
+++ stack/stack.c	2002/02/06 11:39:20	1.39
@@ -307,10 +307,18 @@
     printf("#<function %p>", (funcp)(stack_head->item->content.ptr));
     break;
   case list:
-    printf("#<list %p>", (funcp)(stack_head->item->content.ptr));
+    /* A list is just a stack, so make stack_head point to it */
+    stack_head=(stackitem *)(stack_head->item->content.ptr);
+    printf("[ ");
+    while(stack_head != NULL) {
+      print_h(stack_head);
+      printf(" ");
+      stack_head=stack_head->next;
+    }
+    printf("]");
     break;
   default:
-    printf("#<unknown %p>", (funcp)(stack_head->item->content.ptr));
+    printf("#<unknown %p>", (stack_head->item->content.ptr));
     break;
   }
 }
@@ -595,6 +603,33 @@
 
 }
 
+/* Reverse a list */
+extern void rev(environment *env){
+  stackitem *old_head, *new_head, *item;
+
+  if((env->head)==NULL) {
+    printerr("Too Few Arguments");
+    env->err=1;
+    return;
+  }
+
+  if(env->head->item->type!=list) {
+    printerr("Bad Argument Type");
+    env->err=2;
+    return;
+  }
+
+  old_head=(stackitem *)(env->head->item->content.ptr);
+  new_head=NULL;
+  while(old_head != NULL){
+    item=old_head;
+    old_head=old_head->next;
+    item->next=new_head;
+    new_head=item;
+  }
+  env->head->item->content.ptr=new_head;
+}
+
 /* Compares two elements by reference. */
 extern void eq(environment *env)
 {