154 lines
4.1 KiB
C
154 lines
4.1 KiB
C
/* $NetBSD: devopen.c,v 1.1.1.1 1998/06/09 07:53:06 dbj Exp $ */
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/*
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* Copyright (c) 1994 Rolf Grossmann
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by Rolf Grossmann.
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* 4. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <lib/libsa/stand.h>
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#include <lib/libkern/libkern.h>
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int
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atoi(const char *cp)
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{
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int val = 0;
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while(isdigit(*cp))
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val = val * 10 + (*cp++ - '0');
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return val;
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}
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int
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devlookup(const char *d, int len)
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{
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struct devsw *dp = devsw;
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int i;
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for (i = 0; i < ndevs; i++, dp++)
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if (dp->dv_name && strncmp(dp->dv_name, d, len) == 0)
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return i;
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for (i = 0; i < len; i++)
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printf("%c", d[i]);
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printf(": no such device - Configured devices are:\n");
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for (dp = devsw, i = 0; i < ndevs; i++, dp++)
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if (dp->dv_name && (void *)dp->dv_open != (void *)nodev)
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printf(" %s", dp->dv_name);
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printf("\n");
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errno = ENXIO;
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return -1;
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}
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/*
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* Parse a device spec.
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*
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* Format:
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* dev(count, lun, part)file
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*/
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int
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devparse(const char *fname, int *dev,
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char *count, char *lun, char *part, char **file)
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{
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int i;
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const char *s, *args[3];
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/* get device name */
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for (s = fname; *s && *s != '/' && *s != '('; s++)
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;
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if (*s == '(') {
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/* lookup device and get index */
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if ((*dev = devlookup(fname, s - fname)) < 0)
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goto baddev;
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/* tokenize device ident */
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args[0] = ++s;
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for (i = 1; *s && *s != ')' && i<3; s++) {
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if (*s == ',')
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args[i++] = ++s;
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}
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if (*s != ')')
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goto baddev;
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switch(i) {
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case 3:
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*count = atoi(args[0]);
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*lun = atoi(args[1]);
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*part = atoi(args[2]);
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break;
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case 2:
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*lun = atoi(args[0]);
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*part = atoi(args[1]);
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break;
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case 1:
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*part = atoi(args[0]);
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break;
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case 0:
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break;
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}
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*file = (char *)++s; /* XXX discard const */
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}
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/* no device present */
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else
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*file = (char *)fname; /* XXX discard const */
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return 0;
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baddev:
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return ENXIO;
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}
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int
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devopen(struct open_file *f, const char *fname, char **file)
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{
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int error;
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int dev;
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char count, lun, part;
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struct devsw *dp;
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dev = 0; /* default device is first in table (usually scsi disk) */
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count = 0;
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lun = 0;
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part = 0;
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if ((error = devparse(fname, &dev, &count, &lun, &part, file)) != 0)
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return error;
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dp = &devsw[dev];
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if ((void *)dp->dv_open == (void *)nodev)
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return ENXIO;
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f->f_dev = dp;
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if ((error = (*dp->dv_open)(f, count, lun, part)) != 0)
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printf("%s(%d,%d,%d): %d = %s\n", devsw[dev].dv_name,
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count, lun, part, error, strerror(error));
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return error;
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}
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