text: /*
   * Copyright 2011 Tresys Technology, LLC. All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   *    1. Redistributions of source code must retain the above copyright notice,
   *       this list of conditions and the following disclaimer.
   * 
   *    2. Redistributions in binary form must reproduce the above copyright notice,
   *       this list of conditions and the following disclaimer in the documentation
   *       and/or other materials provided with the distribution.
   * 
   * THIS SOFTWARE IS PROVIDED BY TRESYS TECHNOLOGY, LLC ``AS IS'' AND ANY EXPRESS
   * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
   * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO
   * EVENT SHALL TRESYS TECHNOLOGY, LLC OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
   * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
   * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
   * OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
   * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   * 
   * The views and conclusions contained in the software and documentation are those
   * of the authors and should not be interpreted as representing official policies,
   * either expressed or implied, of Tresys Technology, LLC.
   */
  
  #ifndef CIL_STACK_H_
  #define CIL_STACK_H_
  
  struct cil_stack {
  	struct cil_stack_item *stack;
  	int size;
  	int pos;
  };
  
  struct cil_stack_item {
  	enum cil_flavor flavor;
  	void *data;
  };
  
  #define cil_stack_for_each_starting_at(stack, start, pos, item) \
  	for (pos = start, item = cil_stack_peek_at(stack, pos); item != NULL; pos++, item = cil_stack_peek_at(stack, pos))
  
  #define cil_stack_for_each(stack, pos, item) cil_stack_for_each_starting_at(stack, 0, pos, item)
  
  
  void cil_stack_init(struct cil_stack **stack);
  void cil_stack_destroy(struct cil_stack **stack);
  
  void cil_stack_empty(struct cil_stack *stack);
  int cil_stack_is_empty(struct cil_stack *stack);
  
  void cil_stack_push(struct cil_stack *stack, enum cil_flavor flavor, void *data);
  struct cil_stack_item *cil_stack_pop(struct cil_stack *stack);
  struct cil_stack_item *cil_stack_peek(struct cil_stack *stack);
  struct cil_stack_item *cil_stack_peek_at(struct cil_stack *stack, int pos);
  
  
  #endif
  