1 /*
2  * BEGIN illumos section
3  *   This is an unstable interface; changes may be made
4  *   without notice.
5  * END illumos section
6  */
7 /***********************************************************************
8 *                                                                      *
9 *               This software is part of the ast package               *
10 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
11 *                      and is licensed under the                       *
12 *                 Eclipse Public License, Version 1.0                  *
13 *                    by AT&T Intellectual Property                     *
14 *                                                                      *
15 *                A copy of the License is available at                 *
16 *          http://www.eclipse.org/org/documents/epl-v10.html           *
17 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
18 *                                                                      *
19 *              Information and Software Systems Research               *
20 *                            AT&T Research                             *
21 *                           Florham Park NJ                            *
22 *                                                                      *
23 *                 Glenn Fowler <gsf@research.att.com>                  *
24 *                  David Korn <dgk@research.att.com>                   *
25 *                   Phong Vo <kpv@research.att.com>                    *
26 *                                                                      *
27 ***********************************************************************/
28 #pragma prototyped
29 /*
30  * David Korn
31  * AT&T Research
32  *
33  * Interface definitions for a stack-like storage library
34  *
35  */
36 
37 #ifndef _STK_H
38 #define _STK_H
39 
40 #include <sfio.h>
41 
42 #define _Stk_data	_Stak_data
43 
44 #define stkstd		(&_Stk_data)
45 
46 #define	Stk_t		Sfio_t
47 
48 #define STK_SMALL	1		/* small stkopen stack		*/
49 #define STK_NULL	2		/* return NULL on overflow	*/
50 
51 #define	stkptr(sp,n)	((char*)((sp)->_data)+(n))
52 #define stktop(sp)	((char*)(sp)->_next)
53 #define	stktell(sp)	((sp)->_next-(sp)->_data)
54 #define stkseek(sp,n)	((n)==0?(char*)((sp)->_next=(sp)->_data):_stkseek(sp,n))
55 
56 #if _BLD_ast && defined(__EXPORT__)
57 #define extern		extern __EXPORT__
58 #endif
59 #if !_BLD_ast && defined(__IMPORT__)
60 #define extern		extern __IMPORT__
61 #endif
62 
63 extern Sfio_t		_Stk_data;
64 
65 #undef	extern
66 
67 #if _BLD_ast && defined(__EXPORT__)
68 #define extern		__EXPORT__
69 #endif
70 
71 extern Stk_t*		stkopen(int);
72 extern Stk_t*		stkinstall(Stk_t*, char*(*)(int));
73 extern int		stkclose(Stk_t*);
74 extern int		stklink(Stk_t*);
75 extern char*		stkalloc(Stk_t*, size_t);
76 extern char*		stkcopy(Stk_t*, const char*);
77 extern char*		stkset(Stk_t*, char*, size_t);
78 extern char*		_stkseek(Stk_t*, ssize_t);
79 extern char*		stkfreeze(Stk_t*, size_t);
80 extern int		stkon(Stk_t*, char*);
81 
82 #undef	extern
83 
84 #endif
85