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stk.h

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*                  Copyright (c) 1985-2005 AT&T Corp.                  *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                            by AT&T Corp.                             *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped
/*
 * David Korn
 * AT&T Research
 *
 * Interface definitions for a stack-like storage library
 *
 */

#ifndef _STK_H
#define _STK_H

#include <sfio.h>

#define _Stk_data _Stak_data

#define stkstd          (&_Stk_data)

#define     Stk_t       Sfio_t

#define STK_SMALL 1           /* small stkopen stack        */
#define STK_NULL  2           /* return NULL on overflow    */

#define     stkptr(sp,n)      ((char*)((sp)->_data)+(n))
#define stktop(sp)      ((char*)(sp)->_next)
#define     stktell(sp) ((sp)->_next-(sp)->_data)
#define stkseek(sp,n)   ((n)==0?(char*)((sp)->_next=(sp)->_data):_stkseek(sp,n))

#if _BLD_ast && defined(__EXPORT__)
#define extern          extern __EXPORT__
#endif
#if !_BLD_ast && defined(__IMPORT__)
#define extern          extern __IMPORT__
#endif

extern Sfio_t           _Stk_data;

#undef      extern

#if _BLD_ast && defined(__EXPORT__)
#define extern          __EXPORT__
#endif

extern Stk_t*           stkopen(int);
extern Stk_t*           stkinstall(Stk_t*, char*(*)(int));
extern int        stkclose(Stk_t*);
extern int        stklink(Stk_t*);
extern char*            stkalloc(Stk_t*, unsigned);
extern char*            stkcopy(Stk_t*,const char*);
extern char*            stkset(Stk_t*, char*, unsigned);
extern char*            _stkseek(Stk_t*, unsigned);
extern char*            stkfreeze(Stk_t*, unsigned);

#undef      extern

#endif

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