/*      $NetBSD: bootconfig.c,v 1.13 2020/10/18 16:28:57 skrll Exp $    */

/*
 * Copyright (c) 1994-1998 Mark Brinicombe.
 * Copyright (c) 1994 Brini.
 * All rights reserved.
 *
 * This code is derived from software written for Brini by Mark Brinicombe
 *
 * 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 Mark Brinicombe
 *      for the NetBSD Project.
 * 4. The name of the company nor the name of the author may be used to
 *    endorse or promote products derived from this software without specific
 *    prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``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 "ether.h"

#include <sys/param.h>

__KERNEL_RCSID(0, "$NetBSD: bootconfig.c,v 1.13 2020/10/18 16:28:57 skrll Exp $");

#include <sys/systm.h>
#include <sys/kmem.h>

#include <machine/bootconfig.h>

#if NETHER > 0
#include <net/if_ether.h>
#endif

/*
 * Function to identify and process different types of boot argument
 * Note, results may contain trailing data, eg:
 * get_bootconf_option("cow=moo milk=1", "moo", BOOTOPT_TYPE_STRING, &ptr)
 * will return ptr of "moo milk=1", *not* "moo"
 */

int __noasan
get_bootconf_option(char *opts, const char *opt, int type, void *result)
{
        char *ptr;
        char *optstart;
        bool neg;

        ptr = opts;

        while (*ptr) {
                /* Find start of option */
                while (*ptr == ' ' || *ptr == '\t')
                        ++ptr;

                if (*ptr == 0)
                        break;

                neg = false;

                /* Is it a negate option */
                if ((type & BOOTOPT_TYPE_MASK) == BOOTOPT_TYPE_BOOLEAN &&
                    *ptr == '!') {
                        neg = true;
                        ++ptr;
                }

                /* Find the end of option */
                optstart = ptr;
                while (*ptr != 0 && *ptr != ' ' && *ptr != '\t' && *ptr != '=')
                        ++ptr;

                if (*ptr == '=' ||
                    (type & BOOTOPT_TYPE_MASK) == BOOTOPT_TYPE_BOOLEAN) {
                        /* compare the option */
                        if (strncmp(optstart, opt, (ptr - optstart)) == 0) {
                                /* found */

                                if (*ptr == '=')
                                        ++ptr;

                                switch (type & BOOTOPT_TYPE_MASK) {
                                case BOOTOPT_TYPE_BOOLEAN :
                                        if (*(ptr - 1) == '=')
                                                *((int *)result) =
                                                    ((u_int)strtoul(ptr, NULL,
                                                    10) != 0);
                                        else
                                                *((int *)result) = !neg;
                                        break;
                                case BOOTOPT_TYPE_STRING :
                                        *((char **)result) = ptr;
                                        break;
                                case BOOTOPT_TYPE_INT :
                                        *((int *)result) =
                                            (u_int)strtoul(ptr, NULL, 10);
                                        break;
                                case BOOTOPT_TYPE_BININT :
                                        *((int *)result) =
                                            (u_int)strtoul(ptr, NULL, 2);
                                        break;
                                case BOOTOPT_TYPE_HEXINT :
                                        *((int *)result) =
                                            (u_int)strtoul(ptr, NULL, 16);
                                        break;
#if NETHER > 0
                                case BOOTOPT_TYPE_MACADDR : {
                                        char mac[18];
                                        if (strlen(ptr) < ETHER_ADDR_LEN)
                                                return 0;
                                        strlcpy(mac, ptr, sizeof(mac));
                                        if (ether_aton_r((u_char *)result,
                                                         ETHER_ADDR_LEN, mac))
                                                return 0;
                                        break;
                                }
#endif
                                default:
                                        return 0;
                                }
                                return 1;
                        }
                }
                /* skip to next option */
                while (*ptr != ' ' && *ptr != '\t' && *ptr != 0)
                        ++ptr;
        }
        return 0;
}

char *
get_bootconf_string(char *opts, const char *key)
{
        char *s, *ret;
        int i = 0;

        if (!get_bootconf_option(opts, key, BOOTOPT_TYPE_STRING, &s))
                return NULL;

        for (;;) {
                if (s[i] == ' ' || s[i] == '\t' || s[i] == '\0')
                        break;
                ++i;
        }

        ret = kmem_alloc(i + 1, KM_SLEEP);
        strlcpy(ret, s, i + 1);
        return ret;
}

bool
match_bootconf_option(char *opts, const char *key, const char *val)
{
        char *s;

        if (!get_bootconf_option(opts, key, BOOTOPT_TYPE_STRING, &s))
                return false;

        return strncmp(s, val, strlen(val)) == 0;
}