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/* No user fns here. Pesch 15apr92. */
/*
* Copyright (c) 1990 The Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted
* provided that the above copyright notice and this paragraph are
* duplicated in all such forms and that any documentation,
* advertising materials, and other materials related to such
* distribution and use acknowledge that the software was developed
* by the University of California, Berkeley. The name of the
* University may not be used to endorse or promote products derived
* from this software without specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#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
_DEFUN (__swsetup, (fp),
register FILE * fp)
{
/* Make sure stdio is set up. */
CHECK_INIT (fp);
/*
* 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.
*/
/* NOT NEEDED FOR CYGNUS SPRINTF ONLY jpg */
if (fp->_bf._base == NULL)
__smakebuf (fp);
if (fp->_flags & __SLBF)
{
/*
* It is line buffered, so make _lbfsize be -_bufsize
* for the putc() macro. We will change _lbfsize back
* to 0 whenever we turn off __SWR.
*/
fp->_w = 0;
fp->_lbfsize = -fp->_bf._size;
}
else
fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
return 0;
}
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