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.
   */
  
  #include <sys/cdefs.h>
  __FBSDID("$FreeBSD$");
  
  #include <stand.h>
  #include <string.h>
  
  #include "bootstrap.h"
  #include "disk.h"
  #include "libuboot.h"
  
  static int uboot_parsedev(struct uboot_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
  uboot_getdev(void **vdev, const char *devspec, const char **path)
  {
  	struct uboot_devdesc **dev = (struct uboot_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 = uboot_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 (uboot_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>[<partition>]:
   *
   */
  static int
  uboot_parsedev(struct uboot_devdesc **dev, const char *devspec,
      const char **path)
  {
  	struct uboot_devdesc *idev;
  	struct devsw *dv;
  	char *cp;
  	const char *np;
  	int i, unit, err;
  
  	/* 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 uboot_devdesc));
  	err = 0;
  	np = (devspec + strlen(dv->dv_name));
  
  	switch(dv->dv_type) {
  	case DEVT_NONE:
  		break;
  
  #ifdef LOADER_DISK_SUPPORT
  	case DEVT_DISK:
  		err = disk_parsedev((struct disk_devdesc *)idev, np, path);
  		if (err != 0)
  			goto fail;
  		break;
  #endif
  
  	case DEVT_NET:
  		unit = 0;
  
  		if (*np && (*np != ':')) {
  			/* get unit number if present */
  			unit = strtol(np, &cp, 0);
  			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;
  
  	default:
  		err = EINVAL;
  		goto fail;
  	}
  	idev->dd.d_dev = dv;
  	if (dev == NULL) {
  		free(idev);
  	} else {
  		*dev = idev;
  	}
  	return (0);
  
  fail:
  	free(idev);
  	return (err);
  }
  
  
  char *
  uboot_fmtdev(void *vdev)
  {
  	struct uboot_devdesc *dev = (struct uboot_devdesc *)vdev;
  	static char buf[128];
  
  	switch(dev->dd.d_dev->dv_type) {
  	case DEVT_NONE:
  		strcpy(buf, "(no device)");
  		break;
  
  	case DEVT_DISK:
  #ifdef LOADER_DISK_SUPPORT
  		return (disk_fmtdev(vdev));
  #endif
  
  	case DEVT_NET:
  		sprintf(buf, "%s%d:", dev->dd.d_dev->dv_name, dev->dd.d_unit);
  		break;
  	}
  	return(buf);
  }
  
  /*
   * Set currdev to suit the value being supplied in (value).
   */
  int
  uboot_setcurrdev(struct env_var *ev, int flags, const void *value)
  {
  	struct uboot_devdesc *ncurr;
  	int rv;
  
  	if ((rv = uboot_parsedev(&ncurr, value, NULL)) != 0)
  		return (rv);
  	free(ncurr);
  	env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
  	return (0);
  }
  