--- stack/stack.c	2002/02/11 22:07:47	1.71
+++ stack/stack.c	2002/02/12 22:13:12	1.72
@@ -9,7 +9,7 @@
 /* strcmp, strcpy, strlen, strcat, strdup */
 #include <string.h>
 
-#define HASHTBLSIZE 65536
+#define HASHTBLSIZE 2048
 
 /* First, define some types. */
 
@@ -156,23 +156,23 @@
 }
 
 /* Generic push function. */
-void push(stackitem** stack_head, stackitem* in_item)
+void push(environment *env, stackitem* in_item)
 {
-  in_item->next= *stack_head;
-  *stack_head= in_item;
+  in_item->next= env->head;
+  env->head= in_item;
 }
 
 /* Push a value onto the stack */
-void push_val(stackitem **stack_head, value *val)
+void push_val(environment *env, value *val)
 {
   stackitem *new_item= malloc(sizeof(stackitem));
   new_item->item= val;
   val->refcount++;
-  push(stack_head, new_item);
+  push(env, new_item);
 }
 
 /* Push an integer onto the stack. */
-void push_int(stackitem **stack_head, int in_val) 
+void push_int(environment *env, int in_val) 
 {
   value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));
@@ -182,11 +182,11 @@
   new_value->type= integer;
   new_value->refcount=1;
 
-  push(stack_head, new_item);
+  push(env, new_item);
 }
 
 /* Copy a string onto the stack. */
-void push_cstring(stackitem **stack_head, const char *in_string)
+void push_cstring(environment *env, const char *in_string)
 {
   value *new_value= malloc(sizeof(value));
   stackitem *new_item= malloc(sizeof(stackitem));
@@ -197,7 +197,7 @@
   new_value->type= string;
   new_value->refcount=1;
 
-  push(stack_head, new_item);
+  push(env, new_item);
 }
 
 /* Mangle a symbol name to a valid C identifier name */
@@ -246,7 +246,7 @@
   new_value->type= string;
   new_value->refcount=1;
 
-  push_val(&(env->head), new_value);
+  push_val(env, new_value);
 }
 
 /* Push a symbol onto the stack. */
@@ -313,7 +313,7 @@
       new_fvalue->refcount= 1;
     }
   }
-  push(&(env->head), new_item);
+  push(env, new_item);
 }
 
 /* Print newline. */
@@ -477,7 +477,7 @@
   }
   toss(env);		/* toss the symbol */
   if(env->err) return;
-  push_val(&(env->head), val); /* Return its bound value */
+  push_val(env, val); /* Return its bound value */
 }
 
 /* If the top element is a symbol, determine if it's bound to a
@@ -522,7 +522,7 @@
     if(env->err) return;
     iterator= (stackitem*)temp_val->content.ptr;
     while(iterator!=NULL) {
-      push_val(&(env->head), iterator->item);
+      push_val(env, iterator->item);
       if(env->head->item->type==symb
 	&& strcmp(";", ((symbol*)(env->head->item->content.ptr))->id)==0) {
 	toss(env);
@@ -610,7 +610,7 @@
   temp= malloc(sizeof(stackitem));
   temp->item= pack;
 
-  push(&(env->head), temp);
+  push(env, temp);
   rev(env);
 }
 
@@ -670,7 +670,7 @@
   result= (left==right);
   
   toss(env); toss(env);
-  push_int(&(env->head), result);
+  push_int(env, result);
 }
 
 /* Negates the top element on the stack. */
@@ -692,7 +692,7 @@
 
   val= env->head->item->content.val;
   toss(env);
-  push_int(&(env->head), !val);
+  push_int(env, !val);
 }
 
 /* Compares the two top elements on the stack and return 0 if they're the
@@ -798,7 +798,7 @@
 
 /* Returns the current error number to the stack */
 extern void errn(environment *env){
-  push_int(&(env->head), env->err);
+  push_int(env, env->err);
 }
 
 extern void read(environment*);
@@ -853,7 +853,7 @@
     strcpy(new_string, b_val->content.ptr);
     strcat(new_string, a_val->content.ptr);
     free_val(a_val); free_val(b_val);
-    push_cstring(&(env->head), new_string);
+    push_cstring(env, new_string);
     free(new_string);
     return;
   }
@@ -873,7 +873,7 @@
     b=env->head->item->content.val;
     toss(env);
     if(env->err) return;
-    push_int(&(env->head), a+b);
+    push_int(env, a+b);
   }
 }
 
@@ -902,7 +902,7 @@
     b=env->head->item->content.val;
     toss(env);
     if(env->err) return;
-    push_int(&(env->head), b-a);
+    push_int(env, b-a);
   }
 }
 
@@ -931,7 +931,7 @@
     b=env->head->item->content.val;
     toss(env);
     if(env->err) return;
-    push_int(&(env->head), b>a);
+    push_int(env, b>a);
   }
 }
 
@@ -987,7 +987,7 @@
     env->err=1;
     return;
   }
-  push_val(&(env->head), copy_val(env->head->item));
+  push_val(env, copy_val(env->head->item));
 }
 
 /* "if", If-Then */
@@ -1078,7 +1078,7 @@
   toss(env); if(env->err) return;
 
   do {
-    push_val(&(env->head), test);
+    push_val(env, test);
     eval(env);
     
     if(env->head->item->type != integer) {
@@ -1091,7 +1091,7 @@
     toss(env); if(env->err) return;
     
     if(truth) {
-      push_val(&(env->head), loop);
+      push_val(env, loop);
       eval(env);
     } else {
       toss(env);
@@ -1132,8 +1132,8 @@
   iterator= foo->content.ptr;
 
   while(iterator!=NULL) {
-    push_val(&(env->head), iterator->item);
-    push_val(&(env->head), loop);
+    push_val(env, iterator->item);
+    push_val(env, loop);
     eval(env); if(env->err) return;
     iterator= iterator->next;
   }
@@ -1168,10 +1168,10 @@
 
   if(ending>=start) {
     for(i= start; i<=ending; i++)
-      push_int(&(env->head), i);
+      push_int(env, i);
   } else {
     for(i= start; i>=ending; i--)
-      push_int(&(env->head), i);
+      push_int(env, i);
   }
 
   push_sym(env, "[");
@@ -1183,7 +1183,7 @@
   char in_string[101];
 
   fgets(in_string, 100, stdin);
-  push_cstring(&(env->head), in_string);
+  push_cstring(env, in_string);
 }
 
 /* Read a value and place on stack */
@@ -1216,9 +1216,9 @@
   if(sscanf(env->in_string, blankform, rest)) {
     ; 
   } else if(sscanf(env->in_string, intform, &itemp, rest) > 0) {
-    push_int(&(env->head), itemp);
+    push_int(env, itemp);
   } else if(sscanf(env->in_string, strform, match, rest) > 0) {
-    push_cstring(&(env->head), match);
+    push_cstring(env, match);
   } else if(sscanf(env->in_string, symbform, match, rest) > 0) {
     push_sym(env, match);
   } else if(sscanf(env->in_string, ebrackform, rest) > 0) {