/*      $OpenBSD: devopen.c,v 1.3 2025/10/31 07:24:18 miod Exp $        */

/*-
 * Copyright (c) 2003 The NetBSD Foundation, Inc.
 * All rights reserved.
 *
 * This code is derived from software contributed to The NetBSD Foundation
 * by Rolf Grossmann.
 *
 * 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 "libsa.h"

#include <sys/disklabel.h>

#define MAXDEVNAME      16

/*
 * Parse a device spec.
 *
 * [A-Za-z]*[0-9]*[A-Za-z]:file
 *    dev   uint    part
 */
int
devparse(const char *fname, int *dev, int *unit, int *part, const char **file)
{
        const char *s;

        *unit = 0;      /* default to wd0a */
        *part = 0;
        *dev  = 0;

        s = strchr(fname, ':');
        if (s != NULL) {
                int devlen;
                int i, u, p = 0;
                struct devsw *dp;
                char devname[MAXDEVNAME];

                devlen = s - fname;
                if (devlen > MAXDEVNAME)
                        return (EINVAL);

                /* extract device name */
                for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
                        devname[i] = fname[i];
                devname[i] = 0;

                if (!isdigit(fname[i]))
                        return (EUNIT);

                /* device number */
                for (u = 0; isdigit(fname[i]) && (i < devlen); i++)
                        u = u * 10 + (fname[i] - '0');

                if (!isalpha(fname[i]))
                        return (EPART);

                /* partition number */
                if (i < devlen)
                        p = DL_PARTNAME2NUM(fname[i++]);

                if (i != devlen)
                        return (ENXIO);

                /* check device name */
                for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
                        if (dp->dv_name && !strcmp(devname, dp->dv_name))
                                break;
                }

                if (i >= ndevs)
                        return (ENXIO);

                *unit = u;
                *part = p;
                *dev  = i;
                fname = ++s;
        }

        *file = fname;

        return (0);
}

int
devopen(struct open_file *f, const char *fname, char **file)
{
        struct devsw *dp;
        int dev, unit, part, error;

        error = devparse(fname, &dev, &unit, &part, (const char **)file);
        if (error)
                return (error);

        dp = &devsw[dev];
        if ((void *)dp->dv_open == (void *)nodev)
                return (ENXIO);

        f->f_dev = dp;

        return (*dp->dv_open)(f, unit, part);
}