/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1982-2011 AT&T Intellectual Property          *
*          Copyright (c) 2020-2021 Contributors to ksh 93u+m           *
*                      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>                   *
*                                                                      *
***********************************************************************/
#ifndef fcgetc
/*
 * David Korn
 * AT&T Labs
 *
 * Fast character input with sfio text streams and strings
 *
 */

#include	<sfio.h>

typedef struct _fcin
{
	Sfio_t		*_fcfile;	/* input file pointer */
	unsigned char	*fcbuff;	/* pointer to input buffer */
	unsigned char	*fclast;	/* pointer to end of input buffer */
	unsigned char	*fcptr;		/* pointer to next input char */
	unsigned char	fcchar;		/* saved character */
	short		fclen;		/* last multibyte char len */
	void (*fcfun)(Sfio_t*,const char*,int,void*);	/* advance function */
	void		*context;	/* context pointer */
	int		fcleft;		/* for multibyte boundary */
	Sfoff_t		fcoff;		/* offset for last read */
} Fcin_t;

#if SHOPT_MULTIBYTE
#   define fcmbget(x)	(mbwide()?_fcmbget(x):fcget())
#else
#   define fcmbget(x)	(fcget())
#endif
#define fcfile()	(_Fcin._fcfile)
#define fcgetc(c)	(((c=fcget()) || (c=fcfill())), c)
#define	fcget()		((int)(*_Fcin.fcptr++))
#define	fcpeek(n)	((int)_Fcin.fcptr[n])
#define	fcseek(n)	((char*)(_Fcin.fcptr+=(n)))
#define fcfirst()	((char*)_Fcin.fcbuff)
#define fclast()	((char*)_Fcin.fclast)
#define fcleft()	(_Fcin.fclast-_Fcin.fcptr)
#define fcsopen(s)	(_Fcin._fcfile=(Sfio_t*)0,_Fcin.fclen=1,_Fcin.fcbuff=_Fcin.fcptr=(unsigned char*)(s))
#define fctell()	(_Fcin.fcoff + (_Fcin.fcptr-_Fcin.fcbuff))
#define fcsave(x)	(*(x) = _Fcin)
#define fcrestore(x)	(_Fcin = *(x))
extern int		fcfill(void);
extern int		fcfopen(Sfio_t*);
extern int		fcclose(void);
void			fcnotify(void(*)(Sfio_t*,const char*,int,void*),void*);
extern int		_fcmbget(short*);

extern Fcin_t		_Fcin;		/* used by macros */

#endif /* fcgetc */
