#include	<stdio.h>char	*malloc();int_filbuf(iop)	register FILE *iop;{	static char smallbuf[_NFILE];	if (iop->_flag & _IORW)		iop->_flag |= _IOREAD;	if ((iop->_flag & _IOREAD) == 0 || iop->_flag & _IOSTRG)		return(EOF);tryagain:	if (iop->_base == NULL) {		if (iop->_flag & _IONBF) {			iop->_base = &smallbuf[fileno(iop)];			goto tryagain;		}		if ((iop->_base = malloc(BUFSIZ)) == NULL) {			iop->_flag |= _IONBF;			goto tryagain;		}		iop->_flag |= _IOMYBUF;	}	iop->_ptr = iop->_base;	iop->_cnt = read(fileno(iop), iop->_ptr, iop->_flag&_IONBF?1:BUFSIZ);	if (--iop->_cnt < 0) {		if (iop->_cnt == -1) {			iop->_flag |= _IOEOF;			if (iop->_flag & _IORW)				iop->_flag &= ~_IOREAD;		} else			iop->_flag |= _IOERR;		iop->_cnt = 0;		return(EOF);	}	return(*iop->_ptr++ & 0377);}