fclose.c

vxworks libc库源代码

/* fclose.c - close file  stdio.h */

/* Copyright 1992-1993 Wind River Systems, Inc. */

/*
modification history
--------------------
01d,05feb99,dgp  document errno values
01c,05mar93,jdi  documentation cleanup for 5.1.
01b,20sep92,smb  documentation additions
01a,29jul92,jcf  added OBJ_VERIFY and memory reclaimation.
	   +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.h, error.h

SEE ALSO: American National Standard X3.159-1989

NOMANUAL
*/

#include "vxWorks.h"
#include "stdio.h"
#include "errno.h"
#include "stdlib.h"
#include "objLib.h"
#include "private/stdioP.h"


/******************************************************************************
*
* fclose - close a stream (ANSI)
*
* This routine flushes a specified stream and closes the associated file.
* Any unwritten buffered data is delivered to the host environment to be
* written to the file; any unread buffered data is discarded.  The stream
* is disassociated from the file.  If the associated buffer was allocated
* automatically, it is deallocated.
* 
* INCLUDE FILES: stdio.h 
*
* RETURNS:
* Zero if the stream is closed successfully, or EOF if errors occur.
*
* ERRNO: EBADF
*
* SEE ALSO: fflush()
*/

int fclose
    (
    FAST FILE * fp	/* stream to close */
    )
    {
    FAST int r;

    if (OBJ_VERIFY (fp, fpClassId) != OK)
	return (EOF);

    if (fp->_flags == 0)		/* not open! */
	{	
	errno = EBADF;
	return (EOF);
	}

    r = (fp->_flags & __SWR) ? (__sflush(fp)) : (0);

    if (__sclose (fp) < 0)
	r = EOF;

    if (fp->_flags & __SMBF)
	free ((char *)fp->_bf._base);

    if (HASUB(fp))			/* ungetc buffer? */
	FREEUB(fp);

    if (HASLB(fp))			/* fgetline buffer? */
	FREELB(fp);

    fp->_flags = 0;			/* release this FILE for reuse */
    stdioFpDestroy (fp);		/* destroy the file pointer */

    return (r);
    }