/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * 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 "namespace.h"
#include <errno.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include "un-namespace.h"
#include <spinlock.h>
#include "libc_private.h"
#include "local.h"

static int
cleanfile(FILE *fp, bool c)
{
        int r;

        r = fp->_flags & __SWR ? __sflush(fp) : 0;
        if (c) {
                if (fp->_close != NULL && (*fp->_close)(fp->_cookie) < 0)
                        r = EOF;
        }

        if (fp->_flags & __SMBF)
                free((char *)fp->_bf._base);
        if (HASUB(fp))
                FREEUB(fp);
        if (HASLB(fp))
                FREELB(fp);
        fp->_file = -1;
        fp->_r = fp->_w = 0;    /* Mess up if reaccessed. */

        /*
         * Lock the spinlock used to protect __sglue list walk in
         * __sfp().  The __sfp() uses fp->_flags == 0 test as an
         * indication of the unused FILE.
         *
         * Taking the lock prevents possible compiler or processor
         * reordering of the writes performed before the final _flags
         * cleanup, making sure that we are done with the FILE before
         * it is considered available.
         */
        STDIO_THREAD_LOCK();
        fp->_flags = 0;         /* Release this FILE for reuse. */
        STDIO_THREAD_UNLOCK();

        return (r);
}

int
fdclose(FILE *fp, int *fdp)
{
        int r, err;

        if (fdp != NULL)
                *fdp = -1;

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

        FLOCKFILE_CANCELSAFE(fp);
        r = 0;
        if (fp->_close != __sclose) {
                r = EOF;
                errno = EOPNOTSUPP;
        } else if (fp->_file < 0) {
                r = EOF;
                errno = EBADF;
        }
        if (r == EOF) {
                err = errno;
                (void)cleanfile(fp, true);
                errno = err;
        } else {
                if (fdp != NULL)
                        *fdp = fp->_file;
                r = cleanfile(fp, false);
        }
        FUNLOCKFILE_CANCELSAFE();

        return (r);
}

int
fclose(FILE *fp)
{
        int r;

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

        FLOCKFILE_CANCELSAFE(fp);
        r = cleanfile(fp, true);
        FUNLOCKFILE_CANCELSAFE();

        return (r);
}