1/*	$NetBSD: devopen.c,v 1.16 2005/12/11 12:18:39 christos Exp $	*/
2
3/*-
4 * Copyright (c) 1992, 1993
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Ralph Campbell.
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. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 *
34 *	@(#)devopen.c	8.1 (Berkeley) 6/10/93
35 */
36
37#include <lib/libsa/stand.h>
38#include <lib/libkern/libkern.h>
39
40/*
41 * Decode the string 'fname', open the device and return the remaining
42 * file name if any.
43 */
44int
45devopen(struct open_file *f, const char *fname, char **file)
46	/* file:	 out */
47{
48	int ctlr = 0, unit = 0, part = 0;
49	int c, rc;
50	char namebuf[20];
51	const char *cp;
52	char *ncp;
53#if !defined(LIBSA_SINGLE_DEVICE)
54	int i;
55	struct devsw *dp;
56#endif
57
58	cp = fname;
59	ncp = namebuf;
60
61	/*
62	 * look for a string like '5/rz0/netbsd' or '5/rz3f/netbsd
63	 * or 3/tftp/netbsd
64	 */
65	if ((c = *cp) >= '0' && c <= '9') {
66		ctlr = c - '0';
67		/* skip the '/' */
68		if (*++cp != '/')
69			return (ENXIO);
70		cp++;
71		while ((c = *cp) != '\0') {
72			if (c == '/')
73				break;
74			if (c >= '0' && c <= '9') {
75				/* read unit number */
76				unit = c - '0';
77
78				/* look for a partition */
79				if ((c = *++cp) >= 'a' && c <= 'h') {
80					part = c - 'a';
81					c = *++cp;
82				}
83				if (c != '/')
84					return (ENXIO);
85				cp++;
86				break;
87			}
88			if (ncp < namebuf + sizeof(namebuf) - 1)
89				*ncp++ = c;
90			cp++;
91		}
92	} else {
93		/* expect a string like 'rz(0,0,0)netbsd' */
94		while ((c = *cp) != '\0') {
95			if (c == '(') {
96				cp++;
97				break;
98			}
99			if (ncp < namebuf + sizeof(namebuf) - 1)
100				*ncp++ = c;
101			cp++;
102		}
103
104		/* get controller number */
105		if ((c = *cp) >= '0' && c <= '9') {
106			ctlr = c - '0';
107			c = *++cp;
108		}
109
110		if (c == ',') {
111			/* get SCSI device number */
112			if ((c = *++cp) >= '0' && c <= '9') {
113				unit = c - '0';
114				c = *++cp;
115			}
116
117			if (c == ',') {
118				/* get partition number */
119				if ((c = *++cp) >= '0' && c <= '9') {
120					part = c - '0';
121					c = *++cp;
122				}
123			}
124		}
125		if (c != ')')
126			return (ENXIO);
127		cp++;
128	}
129	*ncp = '\0';
130
131#ifdef LIBSA_SINGLE_DEVICE
132	rc = DEV_OPEN(dp)(f, ctlr, unit, part);
133#else /* !LIBSA_SINGLE_DEVICE */
134	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
135		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
136			goto fnd;
137	printf("Unknown device '%s'\nKnown devices are:", namebuf);
138	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
139		if (dp->dv_name)
140			printf(" %s", dp->dv_name);
141	printf("\n");
142	return (ENXIO);
143
144fnd:
145#ifdef BOOTNET
146	if (strcmp(namebuf, "tftp") == 0)
147		rc = (dp->dv_open)(f, namebuf);
148	else
149#endif /* BOOTNET */
150		rc = (dp->dv_open)(f, ctlr, unit, part);
151#endif /* !LIBSA_SINGLE_DEVICE */
152	if (rc)
153		return (rc);
154
155#ifndef LIBSA_SINGLE_DEVICE
156	f->f_dev = dp;
157#endif
158	if (file && *cp != '\0')
159		*file = (char *)cp;	/* XXX */
160	return (0);
161}
162