//
// With _Fcin.fcptr>_Fcin.fcbuff, the stream pointer is advanced.
// 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) {
int n;
Sfio_t *f;
unsigned char *last = _Fcin.fclast, *ptr = _Fcin.fcptr;
f = fcfile();
if (!f) {
// 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;
}
n = ptr - _Fcin.fcbuff;
if (n && _Fcin.fcfun) (*_Fcin.fcfun)(f, (const char *)_Fcin.fcbuff, n, _Fcin.context);
sfread(f, (char *)_Fcin.fcbuff, n);
_Fcin.fcoff += n;
_Fcin._fcfile = NULL;
if (!last) {
return 0;
} else if (fcfopen(f) < 0) {
return EOF;
}
return *_Fcin.fcptr++;
}
/*
* 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++);
}