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att
GitHub Repository: att/ast
 Path: blob/master/src/lib/libast/include/stk.h
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/***********************************************************************

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*                                                                      *

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*               This software is part of the ast package               *

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*          Copyright (c) 1985-2011 AT&T Intellectual Property          *

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*                      and is licensed under the                       *

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*                 Eclipse Public License, Version 1.0                  *

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*                    by AT&T Intellectual Property                     *

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*                                                                      *

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*                A copy of the License is available at                 *

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*          http://www.eclipse.org/org/documents/epl-v10.html           *

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*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

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*                                                                      *

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*              Information and Software Systems Research               *

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*                            AT&T Research                             *

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*                           Florham Park NJ                            *

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*                                                                      *

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*                 Glenn Fowler <[email protected]>                  *

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*                  David Korn <[email protected]>                   *

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*                   Phong Vo <[email protected]>                    *

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*                                                                      *

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***********************************************************************/

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#pragma prototyped

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/*

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 * David Korn

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 * AT&T Research

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 *

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 * Interface definitions for a stack-like storage library

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 *

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 */

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#ifndef _STK_H

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#define _STK_H

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#include <sfio.h>

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#define _Stk_data	_Stak_data

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#define stkstd		(&_Stk_data)

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#define	Stk_t		Sfio_t

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#define STK_SMALL	1		/* small stkopen stack		*/

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#define STK_NULL	2		/* return NULL on overflow	*/

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#define	stkptr(sp,n)	((char*)((sp)->_data)+(n))

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#define stktop(sp)	((char*)(sp)->_next)

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#define	stktell(sp)	((sp)->_next-(sp)->_data)

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

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#if _BLD_ast && defined(__EXPORT__)

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#define extern		extern __EXPORT__

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#endif

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#if !_BLD_ast && defined(__IMPORT__)

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#define extern		extern __IMPORT__

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#endif

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extern Sfio_t		_Stk_data;

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#undef	extern

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#if _BLD_ast && defined(__EXPORT__)

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#define extern		__EXPORT__

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#endif

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extern Stk_t*		stkopen(int);

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extern Stk_t*		stkinstall(Stk_t*, char*(*)(int));

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extern int		stkclose(Stk_t*);

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extern int		stklink(Stk_t*);

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extern char*		stkalloc(Stk_t*, size_t);

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extern char*		stkcopy(Stk_t*, const char*);

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extern char*		stkset(Stk_t*, char*, size_t);

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extern char*		_stkseek(Stk_t*, ssize_t);

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extern char*		stkfreeze(Stk_t*, size_t);

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extern int		stkon(Stk_t*, char*);

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#undef	extern

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#endif

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