/*-
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Copyright (c) 2006 Dag-Erling Smørgrav
 * 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
 *    in this position and unchanged.
 * 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 <sys/param.h>
#include <sys/linker.h>
#include <sys/module.h>

#include <errno.h>
#include <libutil.h>
#include <string.h>

int
kld_isloaded(const char *name)
{
        struct kld_file_stat fstat;
        struct module_stat mstat;
        const char *ko;
        int fid, mid;

        for (fid = kldnext(0); fid > 0; fid = kldnext(fid)) {
                fstat.version = sizeof(fstat);
                if (kldstat(fid, &fstat) != 0)
                        continue;
                /* check if the file name matches the supplied name */
                if (strcmp(fstat.name, name) == 0)
                        return (1);
                /* strip .ko and try again */
                if ((ko = strstr(fstat.name, ".ko")) != NULL &&
                    strlen(name) == (size_t)(ko - fstat.name) &&
                    strncmp(fstat.name, name, ko - fstat.name) == 0)
                        return (1);
                /* look for a matching module within the file */
                for (mid = kldfirstmod(fid); mid > 0; mid = modfnext(mid)) {
                        mstat.version = sizeof(mstat);
                        if (modstat(mid, &mstat) != 0)
                                continue;
                        if (strcmp(mstat.name, name) == 0)
                                return (1);
                }
        }
        return (0);
}

int
kld_load(const char *name)
{
        if (kldload(name) == -1 && errno != EEXIST)
                return (-1);
        return (0);
}