Annotation of sys/arch/armish/stand/boot/devopen.c, Revision 1.1.1.1
1.1 nbrk 1: /* $OpenBSD: devopen.c,v 1.2 2006/07/29 15:01:49 kettenis Exp $ */
2: /* $NetBSD: devopen.c,v 1.1 2003/06/25 17:24:22 cdi Exp $ */
3:
4: /*-
5: * Copyright (c) 2003 The NetBSD Foundation, Inc.
6: * All rights reserved.
7: *
8: * This code is derived from software contributed to The NetBSD Foundation
9: * by Rolf Grossmann.
10: *
11: * Redistribution and use in source and binary forms, with or without
12: * modification, are permitted provided that the following conditions
13: * are met:
14: * 1. Redistributions of source code must retain the above copyright
15: * notice, this list of conditions and the following disclaimer.
16: * 2. Redistributions in binary form must reproduce the above copyright
17: * notice, this list of conditions and the following disclaimer in the
18: * documentation and/or other materials provided with the distribution.
19: * 3. All advertising materials mentioning features or use of this software
20: * must display the following acknowledgement:
21: * This product includes software developed by the NetBSD
22: * Foundation, Inc. and its contributors.
23: * 4. Neither the name of The NetBSD Foundation nor the names of its
24: * contributors may be used to endorse or promote products derived
25: * from this software without specific prior written permission.
26: *
27: * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
28: * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
29: * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
30: * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
31: * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
32: * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
33: * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
34: * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
35: * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
36: * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
37: * POSSIBILITY OF SUCH DAMAGE.
38: */
39:
40: #include "libsa.h"
41:
42: #define MAXDEVNAME 16
43:
44: /*
45: * Parse a device spec.
46: *
47: * [A-Za-z]*[0-9]*[A-Za-z]:file
48: * dev uint part
49: */
50: int
51: devparse(const char *fname, int *dev, int *unit, int *part, const char **file)
52: {
53: const char *s;
54:
55: *unit = 0; /* default to wd0a */
56: *part = 0;
57: *dev = 0;
58:
59: s = strchr(fname, ':');
60: if (s != NULL) {
61: int devlen;
62: int i, u, p;
63: struct devsw *dp;
64: char devname[MAXDEVNAME];
65:
66: devlen = s - fname;
67: if (devlen > MAXDEVNAME)
68: return (EINVAL);
69:
70: /* extract device name */
71: for (i = 0; isalpha(fname[i]) && (i < devlen); i++)
72: devname[i] = fname[i];
73: devname[i] = 0;
74:
75: if (!isdigit(fname[i]))
76: return (EUNIT);
77:
78: /* device number */
79: for (u = 0; isdigit(fname[i]) && (i < devlen); i++)
80: u = u * 10 + (fname[i] - '0');
81:
82: if (!isalpha(fname[i]))
83: return (EPART);
84:
85: /* partition number */
86: if (i < devlen)
87: p = fname[i++] - 'a';
88:
89: if (i != devlen)
90: return (ENXIO);
91:
92: /* check device name */
93: for (dp = devsw, i = 0; i < ndevs; dp++, i++) {
94: if (dp->dv_name && !strcmp(devname, dp->dv_name))
95: break;
96: }
97:
98: if (i >= ndevs)
99: return (ENXIO);
100:
101: *unit = u;
102: *part = p;
103: *dev = i;
104: fname = ++s;
105: }
106:
107: *file = fname;
108:
109: return (0);
110: }
111:
112: int
113: devopen(struct open_file *f, const char *fname, char **file)
114: {
115: struct devsw *dp;
116: int dev, unit, part, error;
117:
118: error = devparse(fname, &dev, &unit, &part, (const char **)file);
119: if (error)
120: return (error);
121:
122: dp = &devsw[dev];
123: if ((void *)dp->dv_open == (void *)nodev)
124: return (ENXIO);
125:
126: f->f_dev = dp;
127:
128: return (*dp->dv_open)(f, unit, part);
129: }
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