/*******************************************************************
*                                                                  *
*             This software is part of the ast package             *
*                Copyright (c) 1982-2004 AT&T Corp.                *
*        and it may only be used by you under license from         *
*                       AT&T Corp. ("AT&T")                        *
*         A copy of the Source Code Agreement is available         *
*                at the AT&T Internet web site URL                 *
*                                                                  *
*       http://www.research.att.com/sw/license/ast-open.html       *
*                                                                  *
*    If you have copied or used this software without agreeing     *
*        to the terms of the license you are infringing on         *
*           the license and copyright and are violating            *
*               AT&T's intellectual property rights.               *
*                                                                  *
*            Information and Software Systems Research             *
*                        AT&T Labs Research                        *
*                         Florham Park NJ                          *
*                                                                  *
*                David Korn <dgk@research.att.com>                 *
*                                                                  *
*******************************************************************/
#pragma prototyped
#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 */
	void (*fcfun)(Sfio_t*,const char*,int);	/* advance function */
	Sfoff_t		fcoff;		/* offset for last read */
} Fcin_t;

#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 fcsopen(s)	(_Fcin._fcfile=(Sfio_t*)0,_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));

extern Fcin_t		_Fcin;		/* used by macros */

#endif /* fcgetc */
