1e98f88776
__sFILE. This was supposed to be done in 6.0. Some notes: - Where possible I restored the various lines to their pre-__sFILEX state. - Retire INITEXTRA() and just initialize the wchar bits (orientation and mbstate) explicitly instead. The various places that used INITEXTRA didn't need the locking fields or _up initialized. (Some places needed _up to exist and not be off the end of a NULL or garbage pointer, but they didn't require it to be initialized to a specific value.) - For now, stdio.h "knows" that pthread_t is a 'struct pthread *' to avoid namespace pollution of including all the pthread types in stdio.h. Once we remove all the inlines and make __sFILE private it can go back to using pthread_t, etc. - This does not remove any of the inlines currently and does not change any of the public ABI of 'FILE'. MFC after: 1 month Reviewed by: peter
147 lines
4.0 KiB
C
147 lines
4.0 KiB
C
/*-
|
|
* 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.
|
|
* 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 sccsid[] = "@(#)refill.c 8.1 (Berkeley) 6/4/93";
|
|
#endif /* LIBC_SCCS and not lint */
|
|
#include <sys/cdefs.h>
|
|
__FBSDID("$FreeBSD$");
|
|
|
|
#include "namespace.h"
|
|
#include <errno.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include "un-namespace.h"
|
|
|
|
#include "libc_private.h"
|
|
#include "local.h"
|
|
|
|
static int lflush(FILE *);
|
|
|
|
static int
|
|
lflush(FILE *fp)
|
|
{
|
|
int ret = 0;
|
|
|
|
if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR)) {
|
|
FLOCKFILE(fp);
|
|
ret = __sflush(fp);
|
|
FUNLOCKFILE(fp);
|
|
}
|
|
return (ret);
|
|
}
|
|
|
|
/*
|
|
* Refill a stdio buffer.
|
|
* Return EOF on eof or error, 0 otherwise.
|
|
*/
|
|
int
|
|
__srefill(FILE *fp)
|
|
{
|
|
|
|
/* make sure stdio is set up */
|
|
if (!__sdidinit)
|
|
__sinit();
|
|
|
|
ORIENT(fp, -1);
|
|
|
|
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;
|
|
fp->_flags |= __SERR;
|
|
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)) {
|
|
/* Ignore this file in _fwalk to avoid potential deadlock. */
|
|
fp->_flags |= __SIGN;
|
|
(void) _fwalk(lflush);
|
|
fp->_flags &= ~__SIGN;
|
|
|
|
/* Now flush this file without locking it. */
|
|
if ((fp->_flags & (__SLBF|__SWR)) == (__SLBF|__SWR))
|
|
__sflush(fp);
|
|
}
|
|
fp->_p = fp->_bf._base;
|
|
fp->_r = _sread(fp, (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);
|
|
}
|