/*      $NetBSD: devicename.c,v 1.9 2017/06/25 12:04:37 maxv Exp $      */

/*-
 * 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: src/sys/boot/ia64/libski/devicename.c,v 1.2 2003/09/08 09:11:32 obrien Exp $"); */

#include <lib/libsa/stand.h>
#include <lib/libsa/loadfile.h>
#include <lib/libkern/libkern.h>
#include <sys/disklabel.h>

#include <bootstrap.h>
#include "libski.h"

static int      ski_parsedev(struct ski_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
ski_getdev(void **vdev, const char *devspec, const char **path)
{
        struct ski_devdesc **dev = (struct ski_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 = ski_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(ski_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
ski_parsedev(struct ski_devdesc **dev, const char *devspec, const char **path)
{
        struct ski_devdesc *idev;
        struct devsw    *dv;
        int dv_type;
        int             i, unit, slice, partition, err;
        char            *cp = NULL;
        const char      *np;

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

        /* look for a device that matches */
        for (i = 0, dv = NULL; i < ndevs; i++) {
                if (!strncmp(devspec, devsw[i].dv_name, strlen(devsw[i].dv_name))) {
                        dv = &devsw[i];
                        break;
                }
        }

        if (dv == NULL)
                return(ENOENT);
        idev = alloc(sizeof(struct ski_devdesc));
        err = 0;
        np = (devspec + strlen(dv->dv_name));
        
        /* XXX: Fixme */
        dv_type = DEVT_DISK;

        switch(dv_type) {
        case DEVT_NONE:                 /* XXX what to do here?  Do we care? */
                break;

        case DEVT_DISK:                 /* XXX: Need to fix DEVT_DISK for NetBSD disk conventions. */
                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 = EPART;
                                        goto fail;
                                }
                        }
                        if (*cp && (*cp != ':')) {
                                partition = *cp - 'a';          /* get a partition number */
                                if ((partition < 0) || (partition >= MAXPARTITIONS)) {
                                        err = EPART;
                                        goto fail;
                                }
                                cp++;
                        }
                }
                if (cp == NULL) {
                        err = EINVAL;
                        goto fail;
                }
                if (*cp && (*cp != ':')) {
                        err = EINVAL;
                        goto fail;
                }

                idev->d_kind.skidisk.unit = unit;
                idev->d_kind.skidisk.slice = slice;
                idev->d_kind.skidisk.partition = partition;

                if (path != NULL)
                        *path = (*cp == 0) ? cp : cp + 1;
                break;
        
        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 == NULL) {
                        err = EINVAL;
                        goto fail;
                }
                if (*cp && (*cp != ':')) {
                        err = EINVAL;
                        goto fail;
                }
        
                idev->d_kind.netif.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_type;
        if (dev == NULL) {
                free(idev);
        } else {
                *dev = idev;
        }
        return(0);

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


char *
ski_fmtdev(void *vdev)
{
        struct ski_devdesc *dev = (struct ski_devdesc *)vdev;
        static char     buf[128];       /* XXX device length constant? */
        size_t len, buflen = sizeof(buf);
    
        switch(dev->d_type) {
        case DEVT_NONE:
                strlcpy(buf, "(no device)", buflen);
                break;

        case DEVT_DISK:
                len = snprintf(buf, buflen, "%s%d", dev->d_dev->dv_name, dev->d_kind.skidisk.unit);
                if (len > buflen)
                        len = buflen;
                if (dev->d_kind.skidisk.slice > 0) {
                        len += snprintf(buf + len, buflen - len, "s%d", dev->d_kind.skidisk.slice);
                        if (len > buflen)
                                len = buflen;
                }
                if (dev->d_kind.skidisk.partition >= 0) {
                        len += snprintf(buf + len, buflen - len, "%c", dev->d_kind.skidisk.partition + 'a');
                        if (len > buflen)
                                len = buflen;
                }
                strlcat(buf, ":", buflen - len);
                break;

        case DEVT_NET:
                snprintf(buf, buflen, "%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
ski_setcurrdev(struct env_var *ev, int flags, void *value)
{
        struct ski_devdesc *ncurr;
        int             rv;
    
        if ((rv = ski_parsedev(&ncurr, value, NULL)) != 0)
                return(rv);
        free(ncurr);
        env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
        return(0);
}