/*- * Copyright (c) 1990, 1993 *	The Regents of the University of California.  All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #if defined(LIBC_SCCS) && !defined(lint)static char rcsid[] = "$OpenBSD: refill.c,v 1.3 1996/08/19 08:33:00 tholo Exp $";#endif /* LIBC_SCCS and not lint */ #include <errno.h>#include <stdio.h>#include <stdlib.h>#include "local.h" static intlflush(fp)	FILE *fp;{ 	if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))		return (__sflush(fp));	return (0);} /* * Refill a stdio buffer. * Return EOF on eof or error, 0 otherwise. */int__srefill(fp)	register FILE *fp;{ 	/* make sure stdio is set up */	if (!__sdidinit)		__sinit(); 	fp->_r = 0;		/* largely a convenience for callers */ 	/* SysV does not make this test; take it out for compatibility */	if (fp->_flags & __SEOF)		return (EOF); 	/* if not already reading, have to be reading and writing */	if ((fp->_flags & __SRD) == 0) {		if ((fp->_flags & __SRW) == 0) {			errno = EBADF;			return (EOF);		}		/* switch to reading */		if (fp->_flags & __SWR) {			if (__sflush(fp))				return (EOF);			fp->_flags &= ~__SWR;			fp->_w = 0;			fp->_lbfsize = 0;		}		fp->_flags |= __SRD;	} else {		/*		 * We were reading.  If there is an ungetc buffer,		 * we must have been reading from that.  Drop it,		 * restoring the previous buffer (if any).  If there		 * is anything in that buffer, return.		 */		if (HASUB(fp)) {			FREEUB(fp);			if ((fp->_r = fp->_ur) != 0) {				fp->_p = fp->_up;				return (0);			}		}	} 	if (fp->_bf._base == NULL)		__smakebuf(fp); 	/*	 * Before reading from a line buffered or unbuffered file,	 * flush all line buffered output files, per the ANSI C	 * standard.	 */	if (fp->_flags & (__SLBF|__SNBF))		(void) _fwalk(lflush);	fp->_p = fp->_bf._base;	fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);	fp->_flags &= ~__SMOD;	/* buffer contents are again pristine */	if (fp->_r <= 0) {		if (fp->_r == 0)			fp->_flags |= __SEOF;		else {			fp->_r = 0;			fp->_flags |= __SERR;		}		return (EOF);	}	return (0);}