/*-
 * 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 <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <stand.h>
#include <string.h>
#include "bootstrap.h"
#include "disk.h"
#include "libi386.h"
#include "libzfs.h"

static int	i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path);

/* 
 * 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
i386_getdev(void **vdev, const char *devspec, const char **path)
{
    struct i386_devdesc **dev = (struct i386_devdesc **)vdev;
    int				rv;
    
    /*
     * If it looks like this is just a path and no
     * device, go with the current device.
     */
    if ((devspec == NULL) || 
	(devspec[0] == '/') || 
	(strchr(devspec, ':') == NULL)) {

	if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
	    (path != NULL))
		*path = devspec;
	return(rv);
    }
    
    /*
     * Try to parse the device name off the beginning of the devspec
     */
    return(i386_parsedev(dev, devspec, path));
}

/*
 * Point (dev) at an allocated device specifier matching the string version
 * at the beginning of (devspec).  Return a pointer to the remaining
 * text in (path).
 *
 * In all cases, the beginning of (devspec) is compared to the names
 * of known devices in the device switch, and then any following text
 * is parsed according to the rules applied to the device type.
 *
 * For disk-type devices, the syntax is:
 *
 * disk<unit>[s<slice>][<partition>]:
 * 
 */
static int
i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path)
{
    struct i386_devdesc *idev;
    struct devsw	*dv;
    int			i, unit, err;
    char		*cp;
    const char		*np;

    /* minimum length check */
    if (strlen(devspec) < 2)
	return(EINVAL);

    /* look for a device that matches */
    for (i = 0, dv = NULL; devsw[i] != NULL; i++) {
	if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) {
	    dv = devsw[i];
	    break;
	}
    }
    if (dv == NULL)
	return(ENOENT);

    np = (devspec + strlen(dv->dv_name));
    idev = NULL;
    err = 0;
        
    switch(dv->dv_type) {
    case DEVT_NONE:
	break;

    case DEVT_DISK:
	idev = malloc(sizeof(struct i386_devdesc));
	if (idev == NULL)
	    return (ENOMEM);

	err = disk_parsedev((struct disk_devdesc *)idev, np, path);
	if (err != 0)
	    goto fail;
	break;

    case DEVT_ZFS:
	idev = malloc(sizeof (struct zfs_devdesc));
	if (idev == NULL)
	    return (ENOMEM);

	err = zfs_parsedev((struct zfs_devdesc *)idev, np, path);
	if (err != 0)
	    goto fail;
	break;

    default:
	idev = malloc(sizeof (struct devdesc));
	if (idev == NULL)
	    return (ENOMEM);

	unit = 0;
	cp = (char *)np;

	if (*np && (*np != ':')) {
	    unit = strtol(np, &cp, 0);	/* get unit number if present */
	    if (cp == np) {
		err = EUNIT;
		goto fail;
	    }
	}

	if (*cp && (*cp != ':')) {
	    err = EINVAL;
	    goto fail;
	}

	idev->dd.d_unit = unit;
	if (path != NULL)
	    *path = (*cp == 0) ? cp : cp + 1;
	break;
    }
    idev->dd.d_dev = dv;
    if (dev != NULL)
	*dev = idev;
    else
	free(idev);

    return(0);

 fail:
    free(idev);
    return(err);
}

/*
 * Set currdev to suit the value being supplied in (value)
 */
int
i386_setcurrdev(struct env_var *ev, int flags, const void *value)
{
	struct i386_devdesc	*ncurr;
	int			rv;

	if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0)
		return (rv);
	free(ncurr);

	return (mount_currdev(ev, flags, value));
}