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- /* Copyright (C) 1991, 1992 Aladdin Enterprises. All rights reserved.
-
- This file is part of Ghostscript.
-
- Ghostscript is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY. No author or distributor accepts responsibility
- to anyone for the consequences of using it or for whether it serves any
- particular purpose or works at all, unless he says so in writing. Refer
- to the Ghostscript General Public License for full details.
-
- Everyone is granted permission to copy, modify and redistribute
- Ghostscript, but only under the conditions described in the Ghostscript
- General Public License. A copy of this license is supposed to have been
- given to you along with Ghostscript so you can know your rights and
- responsibilities. It should be in a file named COPYING. Among other
- things, the copyright notice and this notice must be preserved on all
- copies. */
-
- /* ostack.h */
- /* Definitions for Ghostscript operand stack */
-
- /********************************
- * NOTE: on MS-DOS systems, the operand stack is stored in the data segment.
- * This leads to large performance gains, at the expense of having to swap
- * the stack explicitly when switching contexts or handling segment under-
- * or overflow (none of which are implemented yet!).
- ********************************/
- typedef ref _ds *os_ptr;
- typedef const ref _ds *const_os_ptr;
- extern os_ptr osbot, osp, ostop;
-
- /* Macro to ensure enough room on the operand stack */
- #define check_ostack(n)\
- if ( ostop - osp < (n) ) return_error(e_stackoverflow)
-