/*-
 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
 * 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 <stand.h>

#include "bootstrap.h"
#include "libofw.h"

/*
 * Point (dev) at an allocated device specifier for the device matching the
 * path in (devspec). If it contains an explicit device specification,
 * use that.  If not, use the default device.
 */
int
ofw_getdev(void **vdev, const char *devspec, const char **path)
{
        struct devdesc **dev = (struct devdesc **)vdev;
        int rv;

        /*
         * If it looks like this is just a path and no device, go with the
         * current device.
         */
        if (devspec == NULL || strpbrk(devspec, ":@") == NULL) {
                rv = devparse(dev, getenv("currdev"), NULL);
                if (rv == 0  && path != NULL)
                        *path = devspec;
                return (rv);
        }

        /*
         * Try to parse the device name off the beginning of the devspec
         */
        return (devparse(dev, devspec, path));
}

/*
 * Search the OFW (path) for a node that's of (want_type).
 */
phandle_t
ofw_path_to_handle(const char *ofwpath, const char *want_type, const char **path)
{
        const char *p, *s;
        char name[256];
        char type[64];
        phandle_t handle;
        int len;

        for (p = s = ofwpath; *s != '\0'; p = s) {
                if ((s = strchr(p + 1, '/')) == NULL)
                        s = strchr(p, '\0');
                len = s - ofwpath;
                if (len >= sizeof(name))
                        return ((phandle_t)-1);
                bcopy(ofwpath, name, len);
                name[len] = '\0';
                if ((handle = OF_finddevice(name)) == -1)
                        continue;
                if (OF_getprop(handle, "device_type", type, sizeof(type)) == -1)
                        continue;
                if (strcmp(want_type, type) == 0) {
                        *path = s;
                        return (handle);
                }
        }
        return ((phandle_t)-1);
}

int
ofw_common_parsedev(struct devdesc **dev, const char *devspec, const char **path,
    const char *ofwtype)
{
        const char *rem_path;
        struct ofw_devdesc *idev;

        if (ofw_path_to_handle(devspec, ofwtype, &rem_path) == -1)
                return (ENOENT);
        idev = malloc(sizeof(struct ofw_devdesc));
        if (idev == NULL) {
                printf("ofw_parsedev: malloc failed\n");
                return (ENOMEM);
        };
        strlcpy(idev->d_path, devspec, min(rem_path - devspec + 1,
                sizeof(idev->d_path)));
        *dev = &idev->dd;
        if (path != NULL)
                *path = rem_path;
        return (0);
}