genericopenlibs/cstdlib/LSTDIO/WSETUP.C
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Tue, 02 Feb 2010 02:01:42 +0200
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/* WSETUP.C
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 * 
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 * Portions Copyright (c) 1990-1999 Nokia Corporation and/or its subsidiary(-ies).
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 * All rights reserved.
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 */
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/* No user fns here. Pesch 15apr92. */
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/*
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 * Copyright (c) 1990 The Regents of the University of California.
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 * All rights reserved.
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 *
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 * Redistribution and use in source and binary forms are permitted
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 * provided that the above copyright notice and this paragraph are
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 * duplicated in all such forms and that any documentation,
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 * advertising materials, and other materials related to such
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 * distribution and use acknowledge that the software was developed
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 * by the University of California, Berkeley.  The name of the
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 * University may not be used to endorse or promote products derived
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 * from this software without specific prior written permission.
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 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
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 * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
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 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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 */
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#include <stdio_r.h>
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#include <stdlib_r.h>
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#include "LOCAL.H"
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/*
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 * Various output routines call wsetup to be sure it is safe to write,
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 * because either _flags does not include __SWR, or _buf is NULL.
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 * _wsetup returns 0 if OK to write, nonzero otherwise.
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 */
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int
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__swsetup (register FILE * fp)
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{
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  /* Make sure stdio is set up.  */
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  CHECK_INIT (fp);
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  /*
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   * If we are not writing, we had better be reading and writing.
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   */
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  if ((fp->_flags & __SWR) == 0)
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    {
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      if ((fp->_flags & __SRW) == 0)
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	return EOF;
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      if (fp->_flags & __SRD)
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	{
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	  /* clobber any ungetc data */
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	  if (HASUB (fp))
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	    FREEUB (fp);
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	  fp->_flags &= ~(__SRD | __SEOF);
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	  fp->_r = 0;
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	  fp->_p = fp->_bf._base;
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	}
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      fp->_flags |= __SWR;
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    }
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  /*
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   * Make a buffer if necessary, then set _w.
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   */
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  /* NOT NEEDED FOR CYGNUS SPRINTF ONLY jpg */
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  if (fp->_bf._base == NULL)
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    __smakebuf (fp);
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  if (fp->_flags & __SLBF)
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    {
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      /*
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       * It is line buffered, so make _lbfsize be -_bufsize
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       * for the putc() macro.  We will change _lbfsize back
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       * to 0 whenever we turn off __SWR.
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       */
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      fp->_w = 0;
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      fp->_lbfsize = -fp->_bf._size;
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    }
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  else
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    fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
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  return 0;
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}