text: /*-
   * 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/arc/lib/devicename.c,v 1.3 2003/04/16 21:09:41 phk Exp $
   */
  
  #include <stand.h>
  #include <string.h>
  #include "bootstrap.h"
  #include "libarc.h"
  
  static int	arc_parsedev(struct arc_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
  arc_getdev(void **vdev, const char *devspec, const char **path)
  {
      struct arc_devdesc **dev = (struct arc_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 = arc_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(arc_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
  arc_parsedev(struct arc_devdesc **dev, const char *devspec, const char **path)
  {
      struct arc_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 arc_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 >= MAXPARTITIONS)) {
  		    err = EPART;
  		    goto fail;
  		}
  		cp++;
  	    }
  	}
  	if (*cp && (*cp != ':')) {
  	    err = EINVAL;
  	    goto fail;
  	}
  
  	idev->d_kind.arcdisk.unit = unit;
  	idev->d_kind.arcdisk.slice = slice;
  	idev->d_kind.arcdisk.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 && (*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->dv_type;
      if (dev == NULL) {
  	free(idev);
      } else {
  	*dev = idev;
      }
      return(0);
  
   fail:
      free(idev);
      return(err);
  }
  
  
  char *
  arc_fmtdev(void *vdev)
  {
      struct arc_devdesc	*dev = (struct arc_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_DISK:
  	cp = buf;
  	cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.arcdisk.unit);
  	if (dev->d_kind.arcdisk.slice > 0)
  	    cp += sprintf(cp, "s%d", dev->d_kind.arcdisk.slice);
  	if (dev->d_kind.arcdisk.partition >= 0)
  	    cp += sprintf(cp, "%c", dev->d_kind.arcdisk.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
  arc_setcurrdev(struct env_var *ev, int flags, void *value)
  {
      struct arc_devdesc	*ncurr;
      int			rv;
      
      if ((rv = arc_parsedev(&ncurr, value, NULL)) != 0)
  	return(rv);
      free(ncurr);
      env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
      return(0);
  }
  
  