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/* $NetBSD: devopen.c,v 1.1 2011/03/03 05:59:37 kiyohara Exp $ */
/*-
* Copyright (c) 2003 The NetBSD Foundation, Inc.
* All rights reserved.
*
* This code is derived from software contributed to The NetBSD Foundation
* by Rolf Grossmann.
*
* 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 NETBSD FOUNDATION, INC. 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 FOUNDATION 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 <lib/libsa/stand.h>
#include <lib/libkern/libkern.h>
#include "boot.h"
extern const struct fs_ops file_system_nfs;
/*
* Parse a device spec.
*
* Format:
* [device:][filename]
*/
int
devparse(const char *fname, int *dev, uint8_t *unit, uint8_t *part,
const char **file)
{
const char *col;
*unit = 0; /* default to wd0a */
*part = 0;
*dev = 0;
*file = DEFKERNELNAME;
if (fname == NULL)
return 0;
if ((col = strchr(fname, ':')) != NULL) {
int devlen;
uint8_t i, u, p;
struct devsw *dp;
char devname[MAXDEVNAME];
devlen = col - fname;
if (devlen > MAXDEVNAME)
return EINVAL;
#define isnum(c) (((c) >= '0') && ((c) <= '9'))
#define isalpha(c) (((c) >= 'a') && ((c) <= 'z'))
/* extract device name */
for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
devname[i] = fname[i];
devname[i] = '\0';
/* parse [disk][unit][part] (ex. wd0a) strings */
if (!isnum(fname[i]))
return EUNIT;
/* device number */
for (u = 0; isnum(fname[i]) && (i < devlen); i++)
u = u * 10 + (fname[i] - '0');
if (!isalpha(fname[i]))
return EPART;
/* partition number */
p = 0;
if (i < devlen)
p = fname[i++] - 'a';
if (i != devlen)
return ENXIO;
/* check device name */
for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
if (dp->dv_name && !strcmp(devname, dp->dv_name))
break;
}
if (i >= ndevs)
return ENXIO;
*unit = u;
*part = p;
*dev = i;
fname = ++col;
}
if (*fname)
*file = fname;
return 0;
}
int
devopen(struct open_file *f, const char *fname, char **file)
{
struct devsw *dp;
uint8_t unit, part;
int dev, error;
DPRINTF(("devopen(%s)\n", fname));
if ((error = devparse(fname, &dev, &unit, &part,
(const char **)file)) != 0)
return error;
dp = &devsw[dev];
if ((void *)dp->dv_open == (void *)nodev)
return ENXIO;
f->f_dev = dp;
if ((error = (*dp->dv_open)(f, unit, part)) != 0)
printf("%s%d%c: %d = %s\n", devsw[dev].dv_name,
unit, 'a' + part, error, strerror(error));
return error;
}
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