Differential D37341 Diff 113708 stand/i386/libi386/devicename.c

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stand/i386/libi386/devicename.c

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	#include <sys/cdefs.h>			#include <sys/cdefs.h>
	__FBSDID("$FreeBSD$");			__FBSDID("$FreeBSD$");

	#include <stand.h>			#include <stand.h>
	#include <string.h>			#include <string.h>
	#include "bootstrap.h"			#include "bootstrap.h"
	#include "disk.h"			#include "disk.h"
	#include "libi386.h"			#include "libi386.h"
	#include "libzfs.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			* Point (dev) at an allocated device specifier for the device matching the
	* path in (devspec). If it contains an explicit device specification,			* path in (devspec). If it contains an explicit device specification,
	* use that. If not, use the default device.			* use that. If not, use the default device.
	*/			*/
	int			int
	i386_getdev(void *vdev, const char devspec, const char **path)			i386_getdev(void *vdev, const char devspec, const char **path)
	{			{
	struct i386_devdesc dev = (struct i386_devdesc )vdev;			struct devdesc dev = (struct devdesc )vdev;
	int rv;			int rv;

	/*			/*
	* If it looks like this is just a path and no			* If it looks like this is just a path and no
	* device, go with the current device.			* device, go with the current device.
	*/			*/
	if ((devspec == NULL) \|\|			if ((devspec == NULL) \|\|
	(devspec[0] == '/') \|\|			(devspec[0] == '/') \|\|
	(strchr(devspec, ':') == NULL)) {			(strchr(devspec, ':') == NULL)) {

	if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) &&			if (((rv = devparse(dev, getenv("currdev"), NULL)) == 0) &&
	(path != NULL))			(path != NULL))
	*path = devspec;			*path = devspec;
	return(rv);			return(rv);
	}			}

	/*			/*
	* Try to parse the device name off the beginning of the devspec			* Try to parse the device name off the beginning of the devspec
	*/			*/
	return(i386_parsedev(dev, devspec, path));			return(devparse(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 = NULL;
	struct devsw *dv;
	int i, unit, 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);

	np = (devspec + strlen(dv->dv_name));
	idev = NULL;
	err = 0;

	switch(dv->dv_type) {
	case DEVT_NONE:
	break;

	case DEVT_DISK:
	err = disk_parsedev((struct devdesc **)&idev, np, path);
	if (err != 0)
	goto fail;
	break;

	case DEVT_ZFS:
	err = zfs_parsedev((struct devdesc **)&idev, np, path);
	if (err != 0)
	goto fail;
	break;

	default:
	idev = malloc(sizeof (struct devdesc));
	if (idev == NULL)
	return (ENOMEM);

	unit = 0;
	cp = (char *)np;

	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->dd.d_unit = unit;
	if (path != NULL)
	path = (cp == 0) ? cp : cp + 1;
	break;
	}
	idev->dd.d_dev = dv;
	if (dev != NULL)
	*dev = idev;
	else
	free(idev);

	return(0);

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

	/*
	* Set currdev to suit the value being supplied in (value)			* Set currdev to suit the value being supplied in (value)
	*/			*/
	int			int
	i386_setcurrdev(struct env_var ev, int flags, const void value)			i386_setcurrdev(struct env_var ev, int flags, const void value)
	{			{
	struct i386_devdesc *ncurr;			struct devdesc *ncurr;
	int rv;			int rv;

	if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0)			if ((rv = devparse(&ncurr, value, NULL)) != 0)
	return (rv);			return (rv);
	free(ncurr);			free(ncurr);

	return (mount_currdev(ev, flags, value));			return (mount_currdev(ev, flags, value));
	}			}