1*e923757cSmiod /* $OpenBSD: devopen.c,v 1.1 2010/02/14 22:39:33 miod Exp $ */
2*e923757cSmiod
3*e923757cSmiod /*-
4*e923757cSmiod * Copyright (c) 2003 The NetBSD Foundation, Inc.
5*e923757cSmiod * All rights reserved.
6*e923757cSmiod *
7*e923757cSmiod * This code is derived from software contributed to The NetBSD Foundation
8*e923757cSmiod * by Rolf Grossmann.
9*e923757cSmiod *
10*e923757cSmiod * Redistribution and use in source and binary forms, with or without
11*e923757cSmiod * modification, are permitted provided that the following conditions
12*e923757cSmiod * are met:
13*e923757cSmiod * 1. Redistributions of source code must retain the above copyright
14*e923757cSmiod * notice, this list of conditions and the following disclaimer.
15*e923757cSmiod * 2. Redistributions in binary form must reproduce the above copyright
16*e923757cSmiod * notice, this list of conditions and the following disclaimer in the
17*e923757cSmiod * documentation and/or other materials provided with the distribution.
18*e923757cSmiod *
19*e923757cSmiod * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
20*e923757cSmiod * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
21*e923757cSmiod * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
22*e923757cSmiod * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
23*e923757cSmiod * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
24*e923757cSmiod * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
25*e923757cSmiod * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
26*e923757cSmiod * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
27*e923757cSmiod * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
28*e923757cSmiod * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
29*e923757cSmiod * POSSIBILITY OF SUCH DAMAGE.
30*e923757cSmiod */
31*e923757cSmiod
32*e923757cSmiod #include "libsa.h"
33*e923757cSmiod
34*e923757cSmiod #define MAXDEVNAME 16
35*e923757cSmiod
36*e923757cSmiod /*
37*e923757cSmiod * Parse a device spec.
38*e923757cSmiod *
39*e923757cSmiod * [A-Za-z]*[0-9]*[A-Za-z]:file
40*e923757cSmiod * dev uint part
41*e923757cSmiod */
42*e923757cSmiod int
devparse(const char * fname,int * dev,int * unit,int * part,const char ** file)43*e923757cSmiod devparse(const char *fname, int *dev, int *unit, int *part, const char **file)
44*e923757cSmiod {
45*e923757cSmiod const char *s;
46*e923757cSmiod
47*e923757cSmiod *unit = 0; /* default to wd0a */
48*e923757cSmiod *part = 0;
49*e923757cSmiod *dev = 0;
50*e923757cSmiod
51*e923757cSmiod s = strchr(fname, ':');
52*e923757cSmiod if (s != NULL) {
53*e923757cSmiod int devlen;
54*e923757cSmiod int i, u, p = 0;
55*e923757cSmiod struct devsw *dp;
56*e923757cSmiod char devname[MAXDEVNAME];
57*e923757cSmiod
58*e923757cSmiod devlen = s - fname;
59*e923757cSmiod if (devlen > MAXDEVNAME)
60*e923757cSmiod return (EINVAL);
61*e923757cSmiod
62*e923757cSmiod /* extract device name */
63*e923757cSmiod for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
64*e923757cSmiod devname[i] = fname[i];
65*e923757cSmiod devname[i] = 0;
66*e923757cSmiod
67*e923757cSmiod if (!isdigit(fname[i]))
68*e923757cSmiod return (EUNIT);
69*e923757cSmiod
70*e923757cSmiod /* device number */
71*e923757cSmiod for (u = 0; isdigit(fname[i]) && (i < devlen); i++)
72*e923757cSmiod u = u * 10 + (fname[i] - '0');
73*e923757cSmiod
74*e923757cSmiod if (!isalpha(fname[i]))
75*e923757cSmiod return (EPART);
76*e923757cSmiod
77*e923757cSmiod /* partition number */
78*e923757cSmiod if (i < devlen)
79*e923757cSmiod p = fname[i++] - 'a';
80*e923757cSmiod
81*e923757cSmiod if (i != devlen)
82*e923757cSmiod return (ENXIO);
83*e923757cSmiod
84*e923757cSmiod /* check device name */
85*e923757cSmiod for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
86*e923757cSmiod if (dp->dv_name && !strcmp(devname, dp->dv_name))
87*e923757cSmiod break;
88*e923757cSmiod }
89*e923757cSmiod
90*e923757cSmiod if (i >= ndevs)
91*e923757cSmiod return (ENXIO);
92*e923757cSmiod
93*e923757cSmiod *unit = u;
94*e923757cSmiod *part = p;
95*e923757cSmiod *dev = i;
96*e923757cSmiod fname = ++s;
97*e923757cSmiod }
98*e923757cSmiod
99*e923757cSmiod *file = fname;
100*e923757cSmiod
101*e923757cSmiod return (0);
102*e923757cSmiod }
103*e923757cSmiod
104*e923757cSmiod int
devopen(struct open_file * f,const char * fname,char ** file)105*e923757cSmiod devopen(struct open_file *f, const char *fname, char **file)
106*e923757cSmiod {
107*e923757cSmiod struct devsw *dp;
108*e923757cSmiod int dev, unit, part, error;
109*e923757cSmiod
110*e923757cSmiod error = devparse(fname, &dev, &unit, &part, (const char **)file);
111*e923757cSmiod if (error)
112*e923757cSmiod return (error);
113*e923757cSmiod
114*e923757cSmiod dp = &devsw[dev];
115*e923757cSmiod if ((void *)dp->dv_open == (void *)nodev)
116*e923757cSmiod return (ENXIO);
117*e923757cSmiod
118*e923757cSmiod f->f_dev = dp;
119*e923757cSmiod
120*e923757cSmiod return (*dp->dv_open)(f, unit, part);
121*e923757cSmiod }
122