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/***********************************************************************
* *
* This software is part of the ast package *
* Copyright (c) 1985-2010 AT&T Intellectual Property *
* and is licensed under the *
* Common Public License, Version 1.0 *
* by AT&T Intellectual Property *
* *
* 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);
extern int stkon(Stk_t*, char *);
#undef extern
#endif
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