forked from KolibriOS/kolibrios
95 lines
2.6 KiB
C
95 lines
2.6 KiB
C
/* No user fns here. Pesch 15apr92. */
|
|
|
|
/*
|
|
* Copyright (c) 1990, 2007 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 <_ansi.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <errno.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 and set errno otherwise.
|
|
*/
|
|
|
|
int
|
|
_DEFUN(__swsetup_r, (ptr, fp),
|
|
struct _reent *ptr _AND
|
|
register FILE * fp)
|
|
{
|
|
/* Make sure stdio is set up. */
|
|
|
|
CHECK_INIT (_REENT, fp);
|
|
|
|
/*
|
|
* If we are not writing, we had better be reading and writing.
|
|
*/
|
|
|
|
if ((fp->_flags & __SWR) == 0)
|
|
{
|
|
if ((fp->_flags & __SRW) == 0)
|
|
{
|
|
ptr->_errno = EBADF;
|
|
fp->_flags |= __SERR;
|
|
return EOF;
|
|
}
|
|
if (fp->_flags & __SRD)
|
|
{
|
|
/* clobber any ungetc data */
|
|
if (HASUB (fp))
|
|
FREEUB (ptr, fp);
|
|
fp->_flags &= ~(__SRD | __SEOF);
|
|
fp->_r = 0;
|
|
fp->_p = fp->_bf._base;
|
|
}
|
|
fp->_flags |= __SWR;
|
|
}
|
|
|
|
/*
|
|
* Make a buffer if necessary, then set _w.
|
|
* A string I/O file should not explicitly allocate a buffer
|
|
* unless asprintf is being used.
|
|
*/
|
|
if (fp->_bf._base == NULL
|
|
&& (!(fp->_flags & __SSTR) || (fp->_flags & __SMBF)))
|
|
__smakebuf_r (ptr, 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;
|
|
|
|
if (!fp->_bf._base && (fp->_flags & __SMBF))
|
|
{
|
|
/* __smakebuf_r set errno, but not flag */
|
|
fp->_flags |= __SERR;
|
|
return EOF;
|
|
}
|
|
return 0;
|
|
}
|