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/* $OpenBSD: devopen.c,v 1.4 2013/09/28 10:05:36 mlarkin Exp $ */
/* $NetBSD: devopen.c,v 1.1 2003/06/25 17:24:22 cdi 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 "libsa.h"
#define MAXDEVNAME 16
/*
* Parse a device spec.
*
* [A-Za-z]*[0-9]*[A-Za-z]:file
* dev uint part
*/
int
devparse(const char *fname, int *dev, int *unit, int *part, const char **file)
{
const char *s;
*unit = 0; /* default to wd0a */
*part = 0;
*dev = 0;
s = strchr(fname, ':');
if (s != NULL) {
int devlen;
int i, u, p = 0;
struct devsw *dp;
char devname[MAXDEVNAME];
devlen = s - fname;
if (devlen > MAXDEVNAME)
return (EINVAL);
/* extract device name */
for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
devname[i] = fname[i];
devname[i] = 0;
if (!isdigit(fname[i]))
return (EUNIT);
/* device number */
for (u = 0; isdigit(fname[i]) && (i < devlen); i++)
u = u * 10 + (fname[i] - '0');
if (!isalpha(fname[i]))
return (EPART);
/* partition number */
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 = ++s;
}
*file = fname;
return (0);
}
int
devopen(struct open_file *f, const char *fname, char **file)
{
struct devsw *dp;
int dev, unit, part, error;
error = devparse(fname, &dev, &unit, &part, (const char **)file);
if (error)
return (error);
dp = &devsw[dev];
if ((void *)dp->dv_open == (void *)nodev)
return (ENXIO);
f->f_dev = dp;
return (*dp->dv_open)(f, unit, part);
}
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