/*

 * stack.h -- Definitions for stack functions for use by extensions.

 */

/* 

 * Copyright (C) 2012, 2013 the Free Software Foundation, Inc.

 * 

 * This file is part of GAWK, the GNU implementation of the

 * AWK Programming Language.

 * 

 * GAWK is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundation; either version 3 of the License, or

 * (at your option) any later version.

 * 

 * GAWK is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 * 

 * You should have received a copy of the GNU General Public License

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA

 */

extern int stack_empty();	/* return true if stack is empty */

extern void *stack_top();	/* return top object on the stack */

extern void *stack_pop();	/* pop top object and return it */

extern int stack_push(void *);	/* push an object onto the stack,

				 * return 0 if failed, 1 if success 

				 */