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*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
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 * David Korn
25 * AT&T Research
26 *
27 * Interface definitions for a stack-like storage library
28 *
29 */
30
31#ifndef _STK_H
32#define _STK_H
33
34#include <sfio.h>
35
36#define _Stk_data	_Stak_data
37
38#define stkstd		(&_Stk_data)
39
40#define	Stk_t		Sfio_t
41
42#define STK_SMALL	1		/* small stkopen stack		*/
43#define STK_NULL	2		/* return NULL on overflow	*/
44
45#define	stkptr(sp,n)	((char*)((sp)->_data)+(n))
46#define stktop(sp)	((char*)(sp)->_next)
47#define	stktell(sp)	((sp)->_next-(sp)->_data)
48#define stkseek(sp,n)	((n)==0?(char*)((sp)->_next=(sp)->_data):_stkseek(sp,n))
49
50#if _BLD_ast && defined(__EXPORT__)
51#define extern		extern __EXPORT__
52#endif
53#if !_BLD_ast && defined(__IMPORT__)
54#define extern		extern __IMPORT__
55#endif
56
57extern Sfio_t		_Stk_data;
58
59#undef	extern
60
61#if _BLD_ast && defined(__EXPORT__)
62#define extern		__EXPORT__
63#endif
64
65extern Stk_t*		stkopen(int);
66extern Stk_t*		stkinstall(Stk_t*, char*(*)(int));
67extern int		stkclose(Stk_t*);
68extern int		stklink(Stk_t*);
69extern char*		stkalloc(Stk_t*, unsigned);
70extern char*		stkcopy(Stk_t*,const char*);
71extern char*		stkset(Stk_t*, char*, unsigned);
72extern char*		_stkseek(Stk_t*, unsigned);
73extern char*		stkfreeze(Stk_t*, unsigned);
74extern int		stkon(Stk_t*, char *);
75
76#undef	extern
77
78#endif
79