--- stack/stack.c	2002/02/05 12:14:42	1.29
+++ stack/stack.c	2002/02/05 23:26:46	1.34
@@ -58,6 +58,7 @@
 typedef struct {
   stackitem *head;		/* Head of the stack */
   hashtbl symbols;		/* Hash table of all variable bindings */
+  int err;			/* Error flag */
 } environment;
 
 /* A type for pointers to external functions */
@@ -178,10 +179,10 @@
   new_symbol= hash(env->symbols, in_string);
   new_value->content.ptr= *new_symbol;
 
-  if(new_value->content.ptr==NULL) { /* If symbol was undefined */
+  if(*new_symbol==NULL) { /* If symbol was undefined */
 
     /* Create a new symbol */
-    *new_symbol= malloc(sizeof(symbol));
+    (*new_symbol)= malloc(sizeof(symbol));
     (*new_symbol)->val= NULL;	/* undefined value */
     (*new_symbol)->next= NULL;
     (*new_symbol)->id= malloc(strlen(in_string)+1);
@@ -348,6 +349,28 @@
   return out_item;
 }
 
+/* Recall a value from a symbol, if bound */
+extern void rcl(environment *env)
+{
+  value *val;
+
+  if(env->head == NULL) {
+    printerr("Stack empty");
+    return;
+  }
+
+  if(env->head->item->type!=symb) {
+    printerr("Not a symbol");
+    return;
+  }
+  val=((symbol *)(env->head->item->content.ptr))->val;
+  if(val == NULL){
+    printerr("Unbound variable");
+    return;
+  }
+  toss(env);		/* toss the symbol */
+  push_val(&(env->head), val); /* Return its bound value */
+}
 
 /* If the top element is a symbol, determine if it's bound to a
    function value, and if it is, toss the symbol and execute the
@@ -392,9 +415,6 @@
     return;
   }
 
-/*    push(&(env->head), copy(env->head)); */
-/*    swap(env); */
-/*    toss(env); */
 }
 
 /* Make a list. */
@@ -469,7 +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;
     }
@@ -624,6 +644,47 @@
     toss(env);
 }
 
+/* List all defined words */
+extern void words(environment *env)
+{
+  symbol *temp;
+  int i;
+  
+  for(i= 0; i<HASHTBLSIZE; i++) {
+    temp= env->symbols[i];
+    while(temp!=NULL) {
+      printf("%s\n", temp->id);
+      temp= temp->next;
+    }
+  }
+}
+
+/* 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;