fflush.c - vx32 - Local 9vx git repository for patches.
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       ---
       fflush.c (2983B)
       ---
            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: fflush.c,v 1.2 1996/08/19 08:32:26 tholo Exp $";
           39 #endif /* LIBC_SCCS and not lint */
           40 
           41 #include <errno.h>
           42 #include <stdio.h>
           43 #include "local.h"
           44 
           45 /* Flush a single file, or (if fp is NULL) all files.  */
           46 int
           47 fflush(fp)
           48         register FILE *fp;
           49 {
           50 
           51         if (fp == NULL)
           52                 return (_fwalk(__sflush));
           53         if ((fp->_flags & (__SWR | __SRW)) == 0) {
           54                 errno = EBADF;
           55                 return (EOF);
           56         }
           57         return (__sflush(fp));
           58 }
           59 
           60 int
           61 __sflush(fp)
           62         register FILE *fp;
           63 {
           64         register unsigned char *p;
           65         register int n, t;
           66 
           67         t = fp->_flags;
           68         if ((t & __SWR) == 0)
           69                 return (0);
           70 
           71         if ((p = fp->_bf._base) == NULL)
           72                 return (0);
           73 
           74         n = fp->_p - p;                /* write this much */
           75 
           76         /*
           77          * Set these immediately to avoid problems with longjmp and to allow
           78          * exchange buffering (via setvbuf) in user write function.
           79          */
           80         fp->_p = p;
           81         fp->_w = t & (__SLBF|__SNBF) ? 0 : fp->_bf._size;
           82 
           83         for (; n > 0; n -= t, p += t) {
           84                 t = (*fp->_write)(fp->_cookie, (char *)p, n);
           85                 if (t <= 0) {
           86                         fp->_flags |= __SERR;
           87                         return (EOF);
           88                 }
           89         }
           90         return (0);
           91 }