924888f977
__swrite() and __sseek() to higher level. According to funopen(3) they all are just wrappers to something like standard read(2), write(2) and lseek(2), i.e. must not touch stdio internals because they are replaceable with any other functions knows nothing about stdio internals. See example of funopen(3) usage in sendmail sources f.e. NOTE: this is original stdio bug, not result of my range checkin added.
160 lines
4.4 KiB
C
160 lines
4.4 KiB
C
/*-
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#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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#endif
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static const char rcsid[] =
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"$FreeBSD$";
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#endif /* LIBC_SCCS and not lint */
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#include "namespace.h"
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "un-namespace.h"
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#include "libc_private.h"
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#include "local.h"
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static int lflush __P((FILE *));
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static int
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lflush(FILE *fp)
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{
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int ret = 0;
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if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {
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FLOCKFILE(fp);
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ret = __sflush(fp);
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FUNLOCKFILE(fp);
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}
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return (ret);
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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(FILE *fp)
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{
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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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fp->_flags |= __SERR;
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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->_extra->_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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/* Ignore this file in _fwalk to avoid potential deadlock. */
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fp->_flags |= __SIGN;
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(void) _fwalk(lflush);
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fp->_flags &= ~__SIGN;
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/* Now flush this file without locking it. */
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if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
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__sflush(fp);
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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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err:
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fp->_r = 0;
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fp->_flags |= __SERR;
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fp->_flags &= ~__SOFF;
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}
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return (EOF);
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} else if (fp->_flags & __SOFF) {
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if (fp->_offset > OFF_MAX - fp->_r) {
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errno = EOVERFLOW;
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goto err;
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} else
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fp->_offset += fp->_r;
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}
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return (0);
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}
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