95 lines
2.5 KiB
C
95 lines
2.5 KiB
C
/* No user fns here. Pesch 15apr92. */
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/*
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* Copyright (c) 1990, 2007 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 <_ansi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <errno.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 and set errno otherwise.
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*/
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int
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_DEFUN(__swsetup_r, (ptr, fp),
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struct _reent *ptr,
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register FILE * fp)
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{
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/* Make sure stdio is set up. */
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CHECK_INIT (_REENT, 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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{
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ptr->_errno = EBADF;
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fp->_flags |= __SERR;
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return EOF;
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}
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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 (ptr, 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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* A string I/O file should not explicitly allocate a buffer
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* unless asprintf is being used.
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*/
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if (fp->_bf._base == NULL
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&& (!(fp->_flags & __SSTR) || (fp->_flags & __SMBF)))
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__smakebuf_r (ptr, 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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if (!fp->_bf._base && (fp->_flags & __SMBF))
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{
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/* __smakebuf_r set errno, but not flag */
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fp->_flags |= __SERR;
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return EOF;
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}
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return 0;
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}
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