1 /* $OpenBSD: wsetup.c,v 1.7 2005/08/08 08:05:36 espie Exp $ */
3 * Copyright (c) 1990, 1993
4 * The Regents of the University of California. All rights reserved.
6 * This code is derived from software contributed to Berkeley by
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10 * modification, are permitted provided that the following conditions
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19 * without specific prior written permission.
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
40 * Various output routines call wsetup to be sure it is safe to write,
41 * because either _flags does not include __SWR, or _buf is NULL.
42 * _wsetup returns 0 if OK to write, nonzero otherwise.
47 /* make sure stdio is set up */
52 * If we are not writing, we had better be reading and writing.
54 if ((fp
->_flags
& __SWR
) == 0) {
55 if ((fp
->_flags
& __SRW
) == 0)
57 if (fp
->_flags
& __SRD
) {
58 /* clobber any ungetc data */
61 fp
->_flags
&= ~(__SRD
|__SEOF
);
63 fp
->_p
= fp
->_bf
._base
;
69 * Make a buffer if necessary, then set _w.
71 if (fp
->_bf
._base
== NULL
) {
72 // if ((fp->_flags & (__SSTR | __SALC)) == __SSTR)
77 if (fp
->_flags
& __SLBF
) {
79 * It is line buffered, so make _lbfsize be -_bufsize
80 * for the putc() macro. We will change _lbfsize back
81 * to 0 whenever we turn off __SWR.
84 fp
->_lbfsize
= -fp
->_bf
._size
;
86 fp
->_w
= fp
->_flags
& __SNBF
? 0 : fp
->_bf
._size
;
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