/*      $OpenBSD: fclose.c,v 1.15 2025/08/04 01:44:33 dlg Exp $ */
/*-
 * Copyright (c) 1990, 1993 The Regents of the University of California.
 * Copyright (c) 2013 Mariusz Zaborski <oshogbo@FreeBSD.org>
 * 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. 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include "local.h"

int
__cleanfile(FILE *fp, int doclose)
{
        int r;

        r = __sflush(fp);
        if (doclose && fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
                r = EOF;
        if (fp->_flags & __SMBF)
                free(fp->_bf._base);
        if (HASUB(fp))
                FREEUB(fp);
        if (HASLB(fp))
                FREELB(fp);
        fp->_r = fp->_w = 0;    /* Mess up if reaccessed. */
        return r;
}

void
__relefile(FILE *fp)
{
        fp->_flags = 0;         /* Release this FILE for reuse. */
}

int
fclose(FILE *fp)
{
        int r;

        if (fp->_flags == 0) {  /* not open! */
                errno = EBADF;
                return (EOF);
        }
        FLOCKFILE(fp);
        r = __cleanfile(fp, 1);
        FUNLOCKFILE(fp);
        __relefile(fp);
        return (r);
}
DEF_STRONG(fclose);