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devopen.c revision 1.1 
      1 /*	$NetBSD: devopen.c,v 1.1 2003/06/25 17:24:22 cdi Exp $	*/
      2 
      3 /*-
      4  * Copyright (c) 2003 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Rolf Grossmann.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  * 3. All advertising materials mentioning features or use of this software
     19  *    must display the following acknowledgement:
     20  *        This product includes software developed by the NetBSD
     21  *        Foundation, Inc. and its contributors.
     22  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23  *    contributors may be used to endorse or promote products derived
     24  *    from this software without specific prior written permission.
     25  *
     26  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36  * POSSIBILITY OF SUCH DAMAGE.
     37  */
     38 
     39 #include <lib/libsa/stand.h>
     40 #include <lib/libkern/libkern.h>
     41 
     42 #include "boot.h"
     43 
     44 /*
     45  * Parse a device spec.
     46  *
     47  * Format:
     48  *  [device:][filename]
     49  */
     50 int
     51 devparse(const char *fname, int *dev, u_int8_t *unit,
     52 		u_int8_t *part, const char **file)
     53 {
     54 	const char *col;
     55 
     56 	*unit = 0;	/* default to wd0a */
     57 	*part = 0;
     58 	*dev  = 0;
     59 	*file = DEFKERNELNAME;
     60 
     61 	if (fname == NULL)
     62 		return (0);
     63 
     64 	if ( (col = strchr(fname, ':')) != NULL) {
     65 		int devlen;
     66 		u_int8_t i, u, p;
     67 		struct devsw *dp;
     68 		char devname[MAXDEVNAME];
     69 
     70 		devlen = col - fname;
     71 		if (devlen > MAXDEVNAME)
     72 			return (EINVAL);
     73 
     74 #define isnum(c)	(((c) >= '0') && ((c) <= '9'))
     75 #define isalpha(c)	(((c) >= 'a') && ((c) <= 'z'))
     76 
     77 		/* extract device name */
     78 		for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
     79 			devname[i] = fname[i];
     80 		devname[i] = 0;
     81 
     82 		if (!isnum(fname[i]))
     83 			return (EUNIT);
     84 
     85 		/* device number */
     86 		for (u = 0; isnum(fname[i]) && (i < devlen); i++)
     87 			u = u * 10 + (fname[i] - '0');
     88 
     89 		if (!isalpha(fname[i]))
     90 			return (EPART);
     91 
     92 		/* partition number */
     93 		if (i < devlen)
     94 			p = fname[i++] - 'a';
     95 
     96 		if (i != devlen)
     97 			return (ENXIO);
     98 
     99 		/* check device name */
    100 		for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
    101 			if (dp->dv_name && !strcmp(devname, dp->dv_name))
    102 				break;
    103 		}
    104 
    105 		if (i >= ndevs)
    106 			return (ENXIO);
    107 
    108 		*unit = u;
    109 		*part = p;
    110 		*dev  = i;
    111 		fname = ++col;
    112 	}
    113 
    114 	if (*fname)
    115 		*file = fname;
    116 
    117 	return (0);
    118 }
    119 
    120 int
    121 devopen(struct open_file *f, const char *fname, char **file)
    122 {
    123     struct devsw *dp;
    124     u_int8_t unit, part;
    125     int dev, error;
    126 
    127     DPRINTF(("devopen(%s)\n", fname));
    128 
    129     if ( (error = devparse(fname, &dev, &unit, &part,
    130 				    (const char **)file)) != 0)
    131 	    return error;
    132 
    133     dp = &devsw[dev];
    134     if ((void *)dp->dv_open == (void *)nodev)
    135 	return ENXIO;
    136 
    137     f->f_dev = dp;
    138 
    139     if ( (error = (*dp->dv_open)(f, unit, part)) != 0)
    140 	printf("%s%d%c: %d = %s\n", devsw[dev].dv_name,
    141 	       unit, 'a' + part, error, strerror(error));
    142 
    143     return error;
    144 }
    145