/*-
 * 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.
 *
 * $FreeBSD: src/sys/boot/i386/libi386/devicename.c,v 1.6 2003/08/25 23:28:31 obrien Exp $
 * $DragonFly: src/sys/boot/pc32/libi386/devicename.c,v 1.4 2007/06/18 05:13:42 dillon Exp $
 */

#include <stand.h>
#include <string.h>
#include <sys/disklabel32.h>
#include "bootstrap.h"
#include "libi386.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, slice, partition, 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);
    idev = malloc(sizeof(struct i386_devdesc));
    err = 0;
    np = (devspec + strlen(dv->dv_name));
        
    switch(dv->dv_type) {
    case DEVT_NONE:                     /* XXX what to do here?  Do we care? */
        break;

    case DEVT_DISK:
        unit = -1;
        slice = -1;
        partition = -1;
        if (*np && (*np != ':')) {
            unit = strtol(np, &cp, 10); /* next comes the unit number */
            if (cp == np) {
                err = EUNIT;
                goto fail;
            }
            if (*cp == 's') {           /* got a slice number */
                np = cp + 1;
                slice = strtol(np, &cp, 10);
                if (cp == np) {
                    err = ESLICE;
                    goto fail;
                }
            }
            if (*cp && (*cp != ':')) {
                partition = *cp - 'a';          /* get a partition number */
                if ((partition < 0) || (partition >= MAXPARTITIONS32)) {
                    err = EPART;
                    goto fail;
                }
                cp++;
            }
        }
        if (*cp && (*cp != ':')) {
            err = EINVAL;
            goto fail;
        }

        idev->d_kind.biosdisk.unit = unit;
        idev->d_kind.biosdisk.slice = slice;
        idev->d_kind.biosdisk.partition = partition;
        if (path != NULL)
            *path = (*cp == 0) ? cp : cp + 1;
        break;

    case DEVT_CD:
    case DEVT_NET:
        unit = 0;

        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;
        }

        if (dv->dv_type == DEVT_NET)
            idev->d_kind.netif.unit = unit;
        else
            idev->d_kind.bioscd.unit = unit;
        if (path != NULL)
            *path = (*cp == 0) ? cp : cp + 1;
        break;

    default:
        err = EINVAL;
        goto fail;
    }
    idev->d_dev = dv;
    idev->d_type = dv->dv_type;
    if (dev == NULL) {
        free(idev);
    } else {
        *dev = idev;
    }
    return(0);

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


char *
i386_fmtdev(void *vdev)
{
    struct i386_devdesc *dev = (struct i386_devdesc *)vdev;
    static char         buf[128];       /* XXX device length constant? */
    char                *cp;
    
    switch(dev->d_type) {
    case DEVT_NONE:
        strcpy(buf, "(no device)");
        break;

    case DEVT_CD:
        sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.bioscd.unit);
        break;

    case DEVT_DISK:
        cp = buf;
        cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.biosdisk.unit);
        if (dev->d_kind.biosdisk.slice > 0)
            cp += sprintf(cp, "s%d", dev->d_kind.biosdisk.slice);
        if (dev->d_kind.biosdisk.partition >= 0)
            cp += sprintf(cp, "%c", dev->d_kind.biosdisk.partition + 'a');
        strcat(cp, ":");
        break;

    case DEVT_NET:
        sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit);
        break;
    }
    return(buf);
}


/*
 * 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);
    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
    return(0);
}