--- stack/stack.c	2002/02/08 04:58:23	1.59
+++ stack/stack.c	2002/02/09 00:40:45	1.66
@@ -496,13 +496,15 @@
     return;
   }
 
+ eval_start:
+
   switch(env->head->item->type) {
     /* if it's a symbol */
   case symb:
     rcl(env);			/* get its contents */
     if(env->err) return;
     if(env->head->item->type!=symb){ /* don't recurse symbols */
-      return eval(env);		/* evaluate the value */
+      goto eval_start;
     }
     return;
 
@@ -528,7 +530,7 @@
 	if(env->err) return;
 	if(iterator->next == NULL){
 	  free_val(temp_val);
-	  return eval(env);
+	  goto eval_start;
 	}
 	eval(env);
 	if(env->err) return;
@@ -551,7 +553,7 @@
     strcat(temp_string, " ]");
     stack_read(env, temp_string);
     free(temp_string);
-    return eval(env);
+    goto eval_start;
 
   case integer:
     return;
@@ -955,10 +957,72 @@
   a=env->head->item->content.val;
   toss(env);
   if(env->err) return;
-  b=env->head->item->content.val;
+  if(env->head->item->refcount == 1)
+    env->head->item->content.val += a;
+  else {
+    b=env->head->item->content.val;
+    toss(env);
+    if(env->err) return;
+    push_int(&(env->head), a+b);
+  }
+}
+
+/* - */
+extern void sx_2d(environment *env) {
+  int a, b;
+
+  if((env->head)==NULL || env->head->next==NULL) {
+    printerr("Too Few Arguments");
+    env->err=1;
+    return;
+  }
+  
+  if(env->head->item->type!=integer
+     || env->head->next->item->type!=integer) {
+    printerr("Bad Argument Type");
+    env->err=2;
+    return;
+  }
+  a=env->head->item->content.val;
+  toss(env);
+  if(env->err) return;
+  if(env->head->item->refcount == 1)
+    env->head->item->content.val -= a;
+  else {
+    b=env->head->item->content.val;
+    toss(env);
+    if(env->err) return;
+    push_int(&(env->head), b-a);
+  }
+}
+
+/* > */
+extern void sx_3e(environment *env) {
+  int a, b;
+
+  if((env->head)==NULL || env->head->next==NULL) {
+    printerr("Too Few Arguments");
+    env->err=1;
+    return;
+  }
+  
+  if(env->head->item->type!=integer
+     || env->head->next->item->type!=integer) {
+    printerr("Bad Argument Type");
+    env->err=2;
+    return;
+  }
+  a=env->head->item->content.val;
   toss(env);
   if(env->err) return;
-  push_int(&(env->head), a+b);
+  if(env->head->item->refcount == 1)
+    env->head->item->content.val = (env->head->item->content.val > a);
+  else {
+    b=env->head->item->content.val;
+    toss(env);
+    if(env->err) return;
+    push_int(&(env->head), b>a);
+  }
 }
 
 /* Return copy of a value */
@@ -1087,6 +1151,7 @@
 extern void sx_7768696c65(environment *env) {
 
   int truth;
+  value *loop, *test;
 
   if((env->head)==NULL || env->head->next==NULL) {
     printerr("Too Few Arguments");
@@ -1094,10 +1159,17 @@
     return;
   }
 
+  loop= env->head->item;
+  loop->refcount++;
+  toss(env); if(env->err) return;
+
+  test= env->head->item;
+  test->refcount++;
+  toss(env); if(env->err) return;
+
   do {
-    swap(env); if(env->err) return;
-    dup(env); if(env->err) return;
-    eval(env); if(env->err) return;
+    push_val(&(env->head), test);
+    eval(env);
     
     if(env->head->item->type != integer) {
       printerr("Bad Argument Type");
@@ -1106,17 +1178,87 @@
     }
     
     truth= env->head->item->content.val;
-    
     toss(env); if(env->err) return;
-    swap(env); if(env->err) return;
     
     if(truth) {
-      dup(env);
+      push_val(&(env->head), loop);
       eval(env);
     } else {
       toss(env);
-      toss(env);
     }
   
   } while(truth);
+
+  free_val(test);
+  free_val(loop);
+}
+
+/* For-loop */
+extern void sx_666f72(environment *env) {
+  
+  value *loop, *foo;
+  stackitem *iterator;
+  
+  if((env->head)==NULL || env->head->next==NULL) {
+    printerr("Too Few Arguments");
+    env->err=1;
+    return;
+  }
+
+  if(env->head->next->item->type != list) {
+    printerr("Bad Argument Type");
+    env->err=2;
+    return;
+  }
+
+  loop= env->head->item;
+  loop->refcount++;
+  toss(env); if(env->err) return;
+
+  foo= env->head->item;
+  foo->refcount++;
+  toss(env); if(env->err) return;
+
+  iterator= foo->content.ptr;
+
+  while(iterator!=NULL) {
+    push_val(&(env->head), iterator->item);
+    push_val(&(env->head), loop);
+    eval(env); if(env->err) return;
+    iterator= iterator->next;
+  }
+
+  free_val(loop);
+  free_val(foo);
+}
+
+/* 'to' */
+extern void to(environment *env) {
+  int i, start, ending;
+  
+  if((env->head)==NULL || env->head->next==NULL) {
+    printerr("Too Few Arguments");
+    env->err=1;
+    return;
+  }
+
+  if(env->head->item->type!=integer 
+     || env->head->next->item->type!=integer) {
+    printerr("Bad Argument Type");
+    env->err=2;
+    return;
+  }
+
+  ending= env->head->item->content.val;
+  toss(env); if(env->err) return;
+  start= env->head->item->content.val;
+  toss(env); if(env->err) return;
+
+  push_sym(env, "[");
+
+  for(i= start; i<= ending; i++)
+    push_int(&(env->head), i);
+
+  push_sym(env, "[");
+  pack(env); if(env->err) return;
 }