wsetup.c - vx32 - Local 9vx git repository for patches.
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       ---
       wsetup.c (3213B)
       ---
            1 /*-
            2  * Copyright (c) 1990, 1993
            3  *        The Regents of the University of California.  All rights reserved.
            4  *
            5  * This code is derived from software contributed to Berkeley by
            6  * Chris Torek.
            7  *
            8  * Redistribution and use in source and binary forms, with or without
            9  * modification, are permitted provided that the following conditions
           10  * are met:
           11  * 1. Redistributions of source code must retain the above copyright
           12  *    notice, this list of conditions and the following disclaimer.
           13  * 2. Redistributions in binary form must reproduce the above copyright
           14  *    notice, this list of conditions and the following disclaimer in the
           15  *    documentation and/or other materials provided with the distribution.
           16  * 3. All advertising materials mentioning features or use of this software
           17  *    must display the following acknowledgement:
           18  *        This product includes software developed by the University of
           19  *        California, Berkeley and its contributors.
           20  * 4. Neither the name of the University nor the names of its contributors
           21  *    may be used to endorse or promote products derived from this software
           22  *    without specific prior written permission.
           23  *
           24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
           25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
           26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
           27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
           28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
           29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
           30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
           31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
           32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
           33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
           34  * SUCH DAMAGE.
           35  */
           36 
           37 #if defined(LIBC_SCCS) && !defined(lint)
           38 static char rcsid[] = "$OpenBSD: wsetup.c,v 1.2 1996/08/19 08:33:16 tholo Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           40 
           41 #include <stdio.h>
           42 #include <stdlib.h>
           43 #include "local.h"
           44 
           45 /*
           46  * Various output routines call wsetup to be sure it is safe to write,
           47  * because either _flags does not include __SWR, or _buf is NULL.
           48  * _wsetup returns 0 if OK to write, nonzero otherwise.
           49  */
           50 int
           51 __swsetup(fp)
           52         register FILE *fp;
           53 {
           54         /* make sure stdio is set up */
           55         if (!__sdidinit)
           56                 __sinit();
           57 
           58         /*
           59          * If we are not writing, we had better be reading and writing.
           60          */
           61         if ((fp->_flags & __SWR) == 0) {
           62                 if ((fp->_flags & __SRW) == 0)
           63                         return (EOF);
           64                 if (fp->_flags & __SRD) {
           65                         /* clobber any ungetc data */
           66                         if (HASUB(fp))
           67                                 FREEUB(fp);
           68                         fp->_flags &= ~(__SRD|__SEOF);
           69                         fp->_r = 0;
           70                         fp->_p = fp->_bf._base;
           71                 }
           72                 fp->_flags |= __SWR;
           73         }
           74 
           75         /*
           76          * Make a buffer if necessary, then set _w.
           77          */
           78         if (fp->_bf._base == NULL)
           79                 __smakebuf(fp);
           80         if (fp->_flags & __SLBF) {
           81                 /*
           82                  * It is line buffered, so make _lbfsize be -_bufsize
           83                  * for the putc() macro.  We will change _lbfsize back
           84                  * to 0 whenever we turn off __SWR.
           85                  */
           86                 fp->_w = 0;
           87                 fp->_lbfsize = -fp->_bf._size;
           88         } else
           89                 fp->_w = fp->_flags & __SNBF ? 0 : fp->_bf._size;
           90         return (0);
           91 }