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/*
** Copyright (C) 1997 The University of Melbourne.
** This file may only be copied under the terms of the GNU Library General
** Public License - see the file COPYING.LIB in the Mercury distribution.
**
** $Id: slist.c,v 1.2 1997/07/27 14:59:29 fjh Exp $
*/
/* Imports */
#include <assert.h> /* for assert */
#include "mem.h" /* for MB_malloc */
#include "slist.h"
/* Exported definitions */
/* Local declarations */
static char
rcs_id[] = "$Id: slist.c,v 1.2 1997/07/27 14:59:29 fjh Exp $";
/* Implementation */
SList
slist_nil()
{
return (SList) NULL;
}
MB_Bool
slist_null(SList list)
{
return NULL == list;
}
SList
slist_cons(void *head, SList tail)
{
p_SList_Node *tmp;
tmp = (SList) MB_malloc(sizeof(p_SList_Node));
tmp->p_head = head;
tmp->p_tail = tail;
return tmp;
}
void *
slist_head(SList list)
{
assert(list != NULL); /* XXX */
return list->p_head;
}
SList
slist_tail(SList list)
{
assert(list != NULL); /* XXX */
return list->p_tail;
}
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