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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;

}