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devopen.c revision 1.1 
      1 /*	$NetBSD: devopen.c,v 1.1 2001/09/27 10:03:28 minoura Exp $	*/
      2 
      3 /*
      4  * Copyright (c) 2001 Minoura Makoto
      5  * All rights reserved.
      6  *
      7  * Redistribution and use in source and binary forms, with or without
      8  * modification, are permitted provided that the following conditions
      9  * are met:
     10  * 1. Redistributions of source code must retain the above copyright
     11  *    notice, this list of conditions and the following disclaimer.
     12  * 2. Redistributions in binary form must reproduce the above copyright
     13  *    notice, this list of conditions and the following disclaimer in the
     14  *    documentation and/or other materials provided with the distribution.
     15  *
     16  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
     17  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     18  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     19  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
     20  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     21  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     22  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     23  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     24  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     25  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     26  * SUCH DAMAGE.
     27  */
     28 
     29 #include <sys/param.h>
     30 #include <sys/disklabel.h>
     31 #include <lib/libkern/libkern.h>
     32 #include <lib/libsa/stand.h>
     33 #include "libx68k.h"
     34 
     35 extern struct devspec devspec[]; /* defined in conf.c */
     36 
     37 /*
     38  * Parse a device spec.
     39  *
     40  * sd<unit><part>:<file>
     41  *  unit - 0-7
     42  *  part - a-p
     43  */
     44 int
     45 devparse(const char *fname, int *dev, int *unit, int *part, char **file)
     46 {
     47 	char const *s;
     48 	int i;
     49 
     50 	s = fname;
     51 	for (i = 0; devspec[i].ds_name != 0; i++) {
     52 		if (strncmp (devspec[i].ds_name, s,
     53 			     strlen(devspec[i].ds_name)) == 0)
     54 			break;
     55 	}
     56 
     57 	if (devspec[i].ds_name == 0)
     58 		return (ENODEV);
     59 	s += strlen(devspec[i].ds_name);
     60 	*dev = devspec[i].ds_dev;
     61 
     62 	*unit = *s++ - '0';
     63 	if (*unit < 0 || *unit > devspec[i].ds_maxunit)
     64 		/* bad unit */
     65 		return (ENODEV);
     66 	*part = *s++ - 'a';
     67 	if (*part < 0 || *part > MAXPARTITIONS)
     68 		/* bad partition */
     69 		return (ENODEV);
     70 
     71 	if (*s++ != ':')
     72 		return (ENODEV);
     73 
     74 	if (*s == '/')
     75 		s++;
     76 	(const char*) *file = s;
     77 
     78 	return 0;
     79 }
     80 
     81 int
     82 devopen(struct open_file *f, const char *fname, char **file)
     83 {
     84 	int error;
     85 	int dev, unit, part;
     86 	struct devsw *dp = &devsw[0];
     87 
     88 	error = devparse(fname, &dev, &unit, &part, file);
     89 	if (error)
     90 	    return(error);
     91 
     92 	dp = &devsw[dev];
     93 
     94 	if (!dp->dv_open)
     95 		return(ENODEV);
     96 
     97 	f->f_dev = dp;
     98 
     99 	if ((error = (*dp->dv_open)(f, unit, part)) == 0)
    100 	    return(0);
    101 
    102 	return(error);
    103 }
    104