1 /* WSETUP.C

     2  * 

     3  * Portions Copyright (c) 1990-1999 Nokia Corporation and/or its subsidiary(-ies).

     4  * All rights reserved.

     5  */

     6 

     7 /* No user fns here. Pesch 15apr92. */

     8 

     9 /*

    10  * Copyright (c) 1990 The Regents of the University of California.

    11  * All rights reserved.

    12  *

    13  * Redistribution and use in source and binary forms are permitted

    14  * provided that the above copyright notice and this paragraph are

    15  * duplicated in all such forms and that any documentation,

    16  * advertising materials, and other materials related to such

    17  * distribution and use acknowledge that the software was developed

    18  * by the University of California, Berkeley.  The name of the

    19  * University may not be used to endorse or promote products derived

    20  * from this software without specific prior written permission.

    21  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR

    22  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED

    23  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.

    24  */

    25 

    26 #include <stdio_r.h>

    27 #include <stdlib_r.h>

    28 #include "LOCAL.H"

    29 

    30 /*

    31  * Various output routines call wsetup to be sure it is safe to write,

    32  * because either _flags does not include __SWR, or _buf is NULL.

    33  * _wsetup returns 0 if OK to write, nonzero otherwise.

    34  */

    35 

    36 int

    37 __swsetup (register FILE * fp)

    38 {

    39   /* Make sure stdio is set up.  */

    40 

    41   CHECK_INIT (fp);

    42 

    43   /*

    44    * If we are not writing, we had better be reading and writing.

    45    */

    46 

    47   if ((fp->_flags & __SWR) == 0)

    48     {

    49       if ((fp->_flags & __SRW) == 0)

    50 	return EOF;

    51       if (fp->_flags & __SRD)

    52 	{

    53 	  /* clobber any ungetc data */

    54 	  if (HASUB (fp))

    55 	    FREEUB (fp);

    56 	  fp->_flags &= ~(__SRD | __SEOF);

    57 	  fp->_r = 0;

    58 	  fp->_p = fp->_bf._base;

    59 	}

    60       fp->_flags |= __SWR;

    61     }

    62 

    63   /*

    64    * Make a buffer if necessary, then set _w.

    65    */

    66   /* NOT NEEDED FOR CYGNUS SPRINTF ONLY jpg */

    67   if (fp->_bf._base == NULL)

    68     __smakebuf (fp);

    69 

    70   if (fp->_flags & __SLBF)

    71     {

    72       /*

    73        * It is line buffered, so make _lbfsize be -_bufsize

    74        * for the putc() macro.  We will change _lbfsize back

    75        * to 0 whenever we turn off __SWR.

    76        */

    77       fp->_w = 0;

    78       fp->_lbfsize = -fp->_bf._size;

    79     }

    80   else

    81     fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;

    82 

    83   return 0;

    84 }