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history.h

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1982-2008 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                            *
*                                                                      *
*                  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 */

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