/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2005-2008 Poul-Henning Kamp
 * All rights reserved.
 *
 * 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.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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 <assert.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <sys/endian.h>
#include <sys/stat.h>
#include <sys/disk.h>

#include "fifolog.h"
#include "libfifolog.h"

const char *
fifolog_create(const char *fn, off_t size, ssize_t recsize)
{
        int i, fd;
        ssize_t u;
        u_int uu;
        off_t ms;
        struct stat st;
        char *buf;
        int created;

        fd = open(fn, O_WRONLY | O_TRUNC | O_EXCL | O_CREAT, 0644);
        if (fd < 0) {
                created = 0;
                fd = open(fn, O_WRONLY);
                if (fd < 0)
                        return ("Could not open");
        } else
                created = 1;

        /* Default sectorsize is 512 */
        if (recsize == 0)
                recsize = 512;

        /* See what we got... */
        i = fstat(fd, &st);
        assert(i == 0);
        if (!S_ISBLK(st.st_mode) &&
            !S_ISCHR(st.st_mode) &&
            !S_ISREG(st.st_mode)) {
                assert(!close (fd));
                return ("Wrong file type");
        }

        if(!created && S_ISREG(st.st_mode)) {
                assert(!close (fd));
                return ("Wrong file type");
        }

        /* For raw disk with larger sectors: use 1 sector */
        i = ioctl(fd, DIOCGSECTORSIZE, &uu);
        u = uu;
        if (i == 0 && (u > recsize || (recsize % u) != 0))
                recsize = u;

        /* If no configured size, or too large for disk, use device size */
        i = ioctl(fd, DIOCGMEDIASIZE, &ms);
        if (i == 0 && (size == 0 || size > ms))
                size = ms;

        if (size == 0 && S_ISREG(st.st_mode))
                size = st.st_size;

        if (size == 0)
                size = recsize * (off_t)(24*60*60);

        if (S_ISREG(st.st_mode) && ftruncate(fd, size) < 0)
                return ("Could not ftrunc");

        buf = calloc(1, recsize);
        if (buf == NULL)
                return ("Could not malloc");

        strcpy(buf, FIFOLOG_FMT_MAGIC);         /*lint !e64 */
        be32enc(buf + FIFOLOG_OFF_BS, recsize);
        if (recsize != pwrite(fd, buf, recsize, 0)) {
                i = errno;
                free(buf);
                errno = i;
                return ("Could not write first sector");
        }
        memset(buf, 0, recsize);
        if ((int)recsize != pwrite(fd, buf, recsize, recsize)) {
                i = errno;
                free(buf);
                errno = i;
                return ("Could not write second sector");
        }
        free(buf);
        assert(0 == close(fd));
        return (NULL);
}