File: [local] / prex-old / usr / lib / libc / stdio / wsetup.c (download)
Revision 1.1.1.1 (vendor branch), Tue Jun 3 09:38:48 2008 UTC (16 years, 2 months ago) by nbrk
Branch: MAIN, KOHSUKE
CVS Tags: PREX_0_8_BASE, PREX_0_7_BASE, HEAD Changes since 1.1: +0 -0 lines
Yeah, this is an initial import of Prex, portable real-time microkernel
operating system. I wanna hack it for non-profit but fun, so let it in.
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/*-
* 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. 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.
*/
#include <stdio.h>
#include <stdlib.h>
#include "local.h"
/*
* Various output routines call wsetup to be sure it is safe to write,
* because either _flags does not include __SWR, or _buf is NULL.
* _wsetup returns 0 if OK to write, nonzero otherwise.
*/
int
__swsetup(fp)
FILE *fp;
{
/* make sure stdio is set up */
if (!__sdidinit)
__sinit();
/*
* If we are not writing, we had better be reading and writing.
*/
if ((fp->_flags & __SWR) == 0) {
if ((fp->_flags & __SRW) == 0)
return (EOF);
if (fp->_flags & __SRD) {
/* clobber any ungetc data */
if (HASUB(fp))
FREEUB(fp);
fp->_flags &= ~(__SRD|__SEOF);
fp->_r = 0;
fp->_p = fp->_bf._base;
}
fp->_flags |= __SWR;
}
/*
* Make a buffer if necessary, then set _w.
*/
if (fp->_bf._base == NULL)
__smakebuf(fp);
fp->_w = fp->_flags & (__SNBF|__SLBF) ? 0 : fp->_bf._size;
return (0);
}