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/***********************************************************************
* *
* 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
/*
* Routines to implement fast character input
*
* David Korn
* AT&T Labs
*
*/
#include <ast.h>
#include <sfio.h>
#include <error.h>
#include <fcin.h>
Fcin_t _Fcin = {0};
/*
* open stream <f> for fast character input
*/
int fcfopen(register Sfio_t* f)
{
register int n;
char *buff;
Fcin_t save;
errno = 0;
_Fcin.fcbuff = _Fcin.fcptr;
_Fcin._fcfile = f;
fcsave(&save);
if(!(buff=(char*)sfreserve(f,SF_UNBOUND,SF_LOCKR)))
{
fcrestore(&save);
_Fcin.fcchar = 0;
_Fcin.fcptr = _Fcin.fcbuff = &_Fcin.fcchar;
_Fcin.fclast = 0;
_Fcin._fcfile = (Sfio_t*)0;
return(EOF);
}
n = sfvalue(f);
fcrestore(&save);
sfread(f,buff,0);
_Fcin.fcoff = sftell(f);;
buff = (char*)sfreserve(f,SF_UNBOUND,SF_LOCKR);
_Fcin.fclast = (_Fcin.fcptr=_Fcin.fcbuff=(unsigned char*)buff)+n;
if(sffileno(f) >= 0)
*_Fcin.fclast = 0;
return(n);
}
/*
* With _Fcin.fcptr>_Fcin.fcbuff, the stream pointer is advanced and
* If _Fcin.fclast!=0, performs an sfreserve() for the next buffer.
* If a notify function has been set, it is called
* If last is non-zero, and the stream is a file, 0 is returned when
* the previous character is a 0 byte.
*/
int fcfill(void)
{
register int n;
register Sfio_t *f;
register unsigned char *last=_Fcin.fclast, *ptr=_Fcin.fcptr;
if(!(f=fcfile()))
{
/* see whether pointer has passed null byte */
if(ptr>_Fcin.fcbuff && *--ptr==0)
_Fcin.fcptr=ptr;
else
_Fcin.fcoff = 0;
return(0);
}
if(last)
{
if( ptr<last && ptr>_Fcin.fcbuff && *(ptr-1)==0)
return(0);
if(_Fcin.fcchar)
*last = _Fcin.fcchar;
if(ptr > last)
_Fcin.fcptr = ptr = last;
}
if((n = ptr-_Fcin.fcbuff) && _Fcin.fcfun)
(*_Fcin.fcfun)(f,(const char*)_Fcin.fcbuff,n,_Fcin.context);
sfread(f, (char*)_Fcin.fcbuff, n);
_Fcin.fcoff +=n;
_Fcin._fcfile = 0;
if(!last)
return(0);
else if(fcfopen(f) < 0)
return(EOF);
return(*_Fcin.fcptr++);
}
/*
* Synchronize and close the current stream
*/
int fcclose(void)
{
register unsigned char *ptr;
if(_Fcin.fclast==0)
return(0);
if((ptr=_Fcin.fcptr)>_Fcin.fcbuff && *(ptr-1)==0)
_Fcin.fcptr--;
if(_Fcin.fcchar)
*_Fcin.fclast = _Fcin.fcchar;
_Fcin.fclast = 0;
_Fcin.fcleft = 0;
return(fcfill());
}
/*
* Set the notify function that is called for each fcfill()
*/
void fcnotify(void (*fun)(Sfio_t*,const char*,int,void*),void* context)
{
_Fcin.fcfun = fun;
_Fcin.context = context;
}
#ifdef __EXPORT__
# define extern __EXPORT__
#endif
#undef fcsave
extern void fcsave(Fcin_t *fp)
{
*fp = _Fcin;
}
#undef fcrestore
extern void fcrestore(Fcin_t *fp)
{
_Fcin = *fp;
}
/* for testing purposes with small buffers */
#if defined(IOBSIZE) && (IOBSIZE < 2*MB_LEN_MAX)
# undef MB_LEN_MAX
# define MB_LEN_MAX (IOBSIZE/2)
#endif
struct Extra
{
unsigned char buff[2*MB_LEN_MAX];
unsigned char *next;
};
int _fcmbget(short *len)
{
static struct Extra extra;
register int i, c, n;
if(_Fcin.fcleft)
{
if((c = mbsize(extra.next)) < 0)
c = 1;
if((_Fcin.fcleft -= c) <=0)
{
_Fcin.fcptr = (unsigned char*)fcfirst() - _Fcin.fcleft;
_Fcin.fcleft = 0;
}
*len = c;
if(c==1)
c = *extra.next++;
else if(c==0)
_Fcin.fcleft = 0;
else
c = mbchar(extra.next);
return(c);
}
switch(*len = mbsize(_Fcin.fcptr))
{
case -1:
if(_Fcin._fcfile && (n=(_Fcin.fclast-_Fcin.fcptr)) < MB_LEN_MAX)
{
memcpy(extra.buff, _Fcin.fcptr, n);
_Fcin.fcptr = _Fcin.fclast;
for(i=n; i < MB_LEN_MAX+n; i++)
{
if((extra.buff[i] = fcgetc(c))==0)
break;
}
_Fcin.fcleft = n;
extra.next = extra.buff;
return(fcmbget(len));
}
*len = 1;
/* fall through */
case 0:
case 1:
c=fcget();
break;
default:
c = mbchar(_Fcin.fcptr);
}
return(c);
}
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