148 lines
3.9 KiB
C
148 lines
3.9 KiB
C
/* $NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Chris Torek.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
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#else
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__RCSID("$NetBSD: refill.c,v 1.13 2003/08/07 16:43:30 agc Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
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#include <assert.h>
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#include <errno.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "reentrant.h"
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#include "local.h"
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#ifdef _REENTRANT
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extern rwlock_t __sfp_lock;
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#endif
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static int lflush __P((FILE *));
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static int
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lflush(fp)
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FILE *fp;
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{
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_DIAGASSERT(fp != NULL);
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if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
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return (__sflush(fp));
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return (0);
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}
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/*
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* Refill a stdio buffer.
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* Return EOF on eof or error, 0 otherwise.
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*/
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int
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__srefill(fp)
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FILE *fp;
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{
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_DIAGASSERT(fp != NULL);
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/* make sure stdio is set up */
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if (!__sdidinit)
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__sinit();
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fp->_r = 0; /* largely a convenience for callers */
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/* SysV does not make this test; take it out for compatibility */
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if (fp->_flags & __SEOF)
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return (EOF);
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/* if not already reading, have to be reading and writing */
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if ((fp->_flags & __SRD) == 0) {
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if ((fp->_flags & __SRW) == 0) {
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errno = EBADF;
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return (EOF);
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}
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/* switch to reading */
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if (fp->_flags & __SWR) {
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if (__sflush(fp))
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return (EOF);
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fp->_flags &= ~__SWR;
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fp->_w = 0;
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fp->_lbfsize = 0;
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}
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fp->_flags |= __SRD;
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} else {
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/*
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* We were reading. If there is an ungetc buffer,
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* we must have been reading from that. Drop it,
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* restoring the previous buffer (if any). If there
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* is anything in that buffer, return.
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*/
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if (HASUB(fp)) {
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FREEUB(fp);
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if ((fp->_r = fp->_ur) != 0) {
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fp->_p = fp->_up;
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return (0);
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}
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}
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}
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if (fp->_bf._base == NULL)
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__smakebuf(fp);
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/*
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* Before reading from a line buffered or unbuffered file,
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* flush all line buffered output files, per the ANSI C
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* standard.
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*/
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if (fp->_flags & (__SLBF|__SNBF)) {
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rwlock_rdlock(&__sfp_lock);
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(void) _fwalk(lflush);
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rwlock_unlock(&__sfp_lock);
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}
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fp->_p = fp->_bf._base;
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fp->_r = (*fp->_read)(fp->_cookie, (char *)fp->_p, fp->_bf._size);
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fp->_flags &= ~__SMOD; /* buffer contents are again pristine */
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if (fp->_r <= 0) {
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if (fp->_r == 0)
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fp->_flags |= __SEOF;
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else {
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fp->_r = 0;
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fp->_flags |= __SERR;
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}
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return (EOF);
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}
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return (0);
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}
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