/* setvbuf.c - set buffered mode. stdio.h *//* Copyright 1992-1993 Wind River Systems, Inc. *//*modification history--------------------01c,05mar93,jdi  documentation cleanup for 5.1.01b,20sep92,smb  documentation additions01a,29jul92,jcf  Added OBJ_VERIFY	   +smb  taken from UCB stdio*//*DESCRIPTION * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Chris Torek. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright *    notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright *    notice, this list of conditions and the following disclaimer in the *    documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software *    must display the following acknowledgement: *	This product includes software developed by the University of *	California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors *    may be used to endorse or promote products derived from this software *    without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE.INCLUDE FILE: stdio.h, stdlib.hSEE ALSO: American National Standard X3.159-1989NOMANUAL*/#include "vxWorks.h"#include "stdio.h"#include "stdlib.h"#include "objLib.h"#include "private/stdioP.h"/******************************************************************************** setvbuf - specify buffering for a stream (ANSI)** This routine sets the buffer size and buffering mode for a specified* stream.  It should be called only after the stream has been associated* with an open file and before any other operation is performed on the* stream.  The argument <mode> determines how the stream will be buffered,* as follows:* .iP _IOFBF 12* input/output is to be fully buffered.* .iP _IOLBF* input/output is to be line buffered.* .iP _IONBF* input/output is to be unbuffered. * .LP** If <buf> is not a null pointer, the array it points to may be used instead* of a buffer allocated by setvbuf().  The argument <size> specifies* the size of the array.  The contents of the array at any time are * indeterminate.* * INCLUDE FILES: stdio.h ** RETURNS:* Zero, or non-zero if <mode> is invalid or the request cannot be honored.*/int setvbuf    (    FAST FILE *	 fp,	/* stream to set buffering for */    char *	 buf,	/* buffer to use (optional) */    FAST int	 mode,	/* _IOFBF = fully buffered */			/* _IOLBF = line buffered */			/* _IONBF = unbuffered */    FAST size_t  size	/* buffer size */    )    {    if (OBJ_VERIFY (fp, fpClassId) != OK)	return (ERROR);    /*     * Verify arguments.  The `int' limit on `size' is due to this     * particular implementation.     */    if (((mode != _IOFBF) && (mode != _IOLBF) && (mode != _IONBF)) ||	((int)size < 0))	return (EOF);    /*     * Write current buffer, if any; drop read count, if any.     * Make sure putc() will not think fp is line buffered.     * Free old buffer if it was from malloc().  Clear line and     * non buffer flags, and clear malloc flag.     */    (void) __sflush (fp);    fp->_r	 = 0;    fp->_lbfsize = 0;    if (fp->_flags & __SMBF)	free ((void *)fp->_bf._base);    fp->_flags &= ~(__SLBF | __SNBF | __SMBF);    /*     * Now put back whichever flag is needed, and fix _lbfsize     * if line buffered.  Ensure output flush on exit if the     * stream will be buffered at all.     */    switch (mode) 	{	case _IONBF:		fp->_flags	|= __SNBF;		fp->_bf._base	 = fp->_p = fp->_nbuf;		fp->_bf._size	 = 1;		break;	case _IOLBF:		fp->_flags 	|= __SLBF;		fp->_lbfsize	 = -size;		/* FALLTHROUGH */	case _IOFBF:		/* no flag */		fp->_bf._base = fp->_p = (unsigned char *)buf;		fp->_bf._size = size;		break;	default:		break;	}    /*     * Patch up write count if necessary.     */    if (fp->_flags & __SWR)	fp->_w = (fp->_flags & (__SLBF | __SNBF)) ? (0) : (size);    return (0);    }