text: /*-
   * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
   * Copyright (c) 2006 Marcel Moolenaar
   * 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: releng/11.0/sys/boot/efi/loader/devicename.c 294068 2016-01-15 02:33:47Z smh $");
  
  #include <stand.h>
  #include <string.h>
  #include <sys/disklabel.h>
  #include <sys/param.h>
  #include <bootstrap.h>
  #ifdef EFI_ZFS_BOOT
  #include <libzfs.h>
  #endif
  
  #include <efi.h>
  #include <efilib.h>
  
  #include "loader_efi.h"
  
  static int efi_parsedev(struct devdesc **, const char *, const char **);
  
  /*
   * 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
  efi_getdev(void **vdev, const char *devspec, const char **path)
  {
  	struct devdesc **dev = (struct devdesc **)vdev;
  	int rv;
  
  	/*
  	 * If it looks like this is just a path and no device, then
  	 * use the current device instead.
  	 */
  	if (devspec == NULL || *devspec == '/' || !strchr(devspec, ':')) {
  		rv = efi_parsedev(dev, getenv("currdev"), NULL);
  		if (rv == 0 && path != NULL)
  			*path = devspec;
  		return (rv);
  	}
  
  	/* Parse the device name off the beginning of the devspec. */
  	return (efi_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:
   *
   * fs<unit>:
   */
  static int
  efi_parsedev(struct devdesc **dev, const char *devspec, const char **path)
  {
  	struct devdesc *idev;
  	struct devsw *dv;
  	char *cp;
  	const char *np;
  	int i;
  
  	/* minimum length check */
  	if (strlen(devspec) < 2)
  		return (EINVAL);
  
  	/* look for a device that matches */
  	for (i = 0; devsw[i] != NULL; i++) {
  		dv = devsw[i];
  		if (!strncmp(devspec, dv->dv_name, strlen(dv->dv_name)))
  			break;
  	}
  	if (devsw[i] == NULL)
  		return (ENOENT);
  
  	np = devspec + strlen(dv->dv_name);
  
  #ifdef EFI_ZFS_BOOT
  	if (dv->dv_type == DEVT_ZFS) {
  		int err;
  
  		idev = malloc(sizeof(struct zfs_devdesc));
  		if (idev == NULL)
  			return (ENOMEM);
  
  		err = zfs_parsedev((struct zfs_devdesc*)idev, np, path);
  		if (err != 0) {
  			free(idev);
  			return (err);
  		}
  		*dev = idev;
  		cp = strchr(np + 1, ':');
  	} else
  #endif
  	{
  		idev = malloc(sizeof(struct devdesc));
  		if (idev == NULL)
  			return (ENOMEM);
  
  		idev->d_dev = dv;
  		idev->d_type = dv->dv_type;
  		idev->d_unit = -1;
  		if (*np != '\0' && *np != ':') {
  			idev->d_unit = strtol(np, &cp, 0);
  			if (cp == np) {
  				idev->d_unit = -1;
  				free(idev);
  				return (EUNIT);
  			}
  		}
  	}
  
  	if (*cp != '\0' && *cp != ':') {
  		free(idev);
  		return (EINVAL);
  	}
  
  	if (path != NULL)
  		*path = (*cp == 0) ? cp : cp + 1;
  	if (dev != NULL)
  		*dev = idev;
  	else
  		free(idev);
  	return (0);
  }
  
  char *
  efi_fmtdev(void *vdev)
  {
  	struct devdesc *dev = (struct devdesc *)vdev;
  	static char buf[SPECNAMELEN + 1];
  
  	switch(dev->d_type) {
  #ifdef EFI_ZFS_BOOT
  	case DEVT_ZFS:
  		return (zfs_fmtdev(dev));
  #endif
  	case DEVT_NONE:
  		strcpy(buf, "(no device)");
  		break;
  
  	default:
  		sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit);
  		break;
  	}
  
  	return (buf);
  }
  
  /*
   * Set currdev to suit the value being supplied in (value)
   */
  int
  efi_setcurrdev(struct env_var *ev, int flags, const void *value)
  {
  	struct devdesc *ncurr;
  	int rv;
  
  	rv = efi_parsedev(&ncurr, value, NULL);
  	if (rv != 0)
  		return (rv);
  
  	free(ncurr);
  	env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
  	return (0);
  }
  