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devopen.c revision 1.2 
      1 /*	$NetBSD: devopen.c,v 1.2 2001/09/29 03:50:13 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 int devopen_open_dir = 0;
     37 
     38 /*
     39  * Parse a device spec.
     40  *
     41  * sd<unit><part>:<file>
     42  *  unit - 0-7
     43  *  part - a-p
     44  */
     45 int
     46 devparse(const char *fname, int *dev, int *unit, int *part, char **file)
     47 {
     48 	char const *s;
     49 	int i;
     50 
     51 	s = fname;
     52 	for (i = 0; devspec[i].ds_name != 0; i++) {
     53 		if (strncmp (devspec[i].ds_name, s,
     54 			     strlen(devspec[i].ds_name)) == 0)
     55 			break;
     56 	}
     57 
     58 	if (devspec[i].ds_name == 0)
     59 		return (ENODEV);
     60 	s += strlen(devspec[i].ds_name);
     61 	*dev = devspec[i].ds_dev;
     62 
     63 	*unit = *s++ - '0';
     64 	if (*unit < 0 || *unit > devspec[i].ds_maxunit)
     65 		/* bad unit */
     66 		return (ENODEV);
     67 	*part = *s++ - 'a';
     68 	if (*part < 0 || *part > MAXPARTITIONS)
     69 		/* bad partition */
     70 		return (ENODEV);
     71 
     72 	if (*s++ != ':')
     73 		return (ENODEV);
     74 
     75 	if (*s == '/') {
     76 		s++;
     77 		if (devopen_open_dir && *s == 0)
     78 			s--;
     79 	}
     80 	(const char*) *file = s;
     81 
     82 	return 0;
     83 }
     84 
     85 int
     86 devopen(struct open_file *f, const char *fname, char **file)
     87 {
     88 	int error;
     89 	int dev, unit, part;
     90 	struct devsw *dp = &devsw[0];
     91 
     92 	error = devparse(fname, &dev, &unit, &part, file);
     93 	if (error)
     94 	    return(error);
     95 
     96 	dp = &devsw[dev];
     97 
     98 	if (!dp->dv_open)
     99 		return(ENODEV);
    100 
    101 	f->f_dev = dp;
    102 
    103 	if ((error = (*dp->dv_open)(f, unit, part)) == 0)
    104 	    return(0);
    105 
    106 	return(error);
    107 }
    108