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

*                                                                      *

*               This software is part of the ast package               *

*          Copyright (c) 1982-2011 AT&T Intellectual Property          *

*                      and is licensed under the                       *

*                 Eclipse Public License, Version 1.0                  *

*                    by AT&T Intellectual Property                     *

*                                                                      *

*                A copy of the License is available at                 *

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

*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *

*                                                                      *

*              Information and Software Systems Research               *

*                            AT&T Research                             *

*                           Florham Park NJ                            *

*                                                                      *

*                  David Korn <dgk@research.att.com>                   *

*                                                                      *

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

#pragma prototyped

#ifndef HIST_VERSION

/*

 *	Interface for history mechanism

 *	written by David Korn

 *

 */

#include	<ast.h>

#define HIST_CHAR	'!'

#define HIST_VERSION	1		/* history file format version no. */

typedef struct 

{

	Sfdisc_t	histdisc;	/* discipline for history */

	Sfio_t		*histfp;	/* history file stream pointer */

	char		*histname;	/* name of history file */

	int32_t		histind;	/* current command number index */

	int		histsize;	/* number of accessible history lines */

#ifdef _HIST_PRIVATE

	_HIST_PRIVATE

#endif /* _HIST_PRIVATE */

} History_t;

typedef struct

{

	int hist_command;

	int hist_line;

	int hist_char;

} Histloc_t;

/* the following are readonly */

extern const char	hist_fname[];

extern int _Hist;

#define	hist_min(hp)	((_Hist=((int)((hp)->histind-(hp)->histsize)))>=0?_Hist:0)

#define	hist_max(hp)	((int)((hp)->histind))

/* these are the history interface routines */

extern int		sh_histinit(void *);

extern void 		hist_cancel(History_t*);

extern void 		hist_close(History_t*);

extern int		hist_copy(char*, int, int, int);

extern void 		hist_eof(History_t*);

extern Histloc_t	hist_find(History_t*,char*,int, int, int);

extern void 		hist_flush(History_t*);

extern void 		hist_list(History_t*,Sfio_t*, off_t, int, char*);

extern int		hist_match(History_t*,off_t, char*, int*);

extern off_t		hist_tell(History_t*,int);

extern off_t		hist_seek(History_t*,int);

extern char 		*hist_word(char*, int, int);

#if SHOPT_ESH

    extern Histloc_t	hist_locate(History_t*,int, int, int);

#endif	/* SHOPT_ESH */

#endif /* HIST_VERSION */