1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
12 *                                                                      *
13 *              Information and Software Systems Research               *
14 *                            AT&T Research                             *
15 *                           Florham Park NJ                            *
16 *                                                                      *
17 *                 Glenn Fowler <gsf@research.att.com>                  *
18 *                  David Korn <dgk@research.att.com>                   *
19 *                   Phong Vo <kpv@research.att.com>                    *
20 *                                                                      *
21 ***********************************************************************/
22 #pragma prototyped
23 /*
24  * Glenn Fowler
25  * AT&T Research
26  *
27  * homogenous stack routine definitions
28  */
29 
30 #ifndef _STACK_H
31 #define _STACK_H
32 
33 typedef struct stacktable* STACK;	/* stack pointer		*/
34 typedef struct stackposition STACKPOS;	/* stack position		*/
35 
36 struct stackblock			/* stack block cell		*/
37 {
38 	void**		  stack;	/* actual stack			*/
39 	struct stackblock* prev;	/* previous block in list	*/
40 	struct stackblock* next;	/* next block in list		*/
41 };
42 
43 struct stackposition			/* stack position		*/
44 {
45 	struct stackblock* block;	/* current block pointer	*/
46 	int		index;		/* index within current block	*/
47 };
48 
49 struct stacktable			/* stack information		*/
50 {
51 	struct stackblock* blocks;	/* stack table blocks		*/
52 	void*		error;		/* error return value		*/
53 	int		size;		/* size of each block		*/
54 	STACKPOS	position;	/* current stack position	*/
55 };
56 
57 /*
58  * map old names to new
59  */
60 
61 #define mkstack		stackalloc
62 #define rmstack		stackfree
63 #define clrstack	stackclear
64 #define getstack	stackget
65 #define pushstack	stackpush
66 #define popstack	stackpop
67 #define posstack	stacktell
68 
69 #if _BLD_ast && defined(__EXPORT__)
70 #define extern		__EXPORT__
71 #endif
72 
73 extern STACK		stackalloc(int, void*);
74 extern void		stackfree(STACK);
75 extern void		stackclear(STACK);
76 extern void*		stackget(STACK);
77 extern int		stackpush(STACK, void*);
78 extern int		stackpop(STACK);
79 extern void		stacktell(STACK, int, STACKPOS*);
80 
81 #undef	extern
82 
83 #endif
84