1/* $NetBSD: devopen.c,v 1.1.1.1 2017/07/24 08:56:29 mrg 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
39/*
40 * Decode the string 'fname', open the device and return the remaining
41 * file name if any.
42 */
43int
44devopen(struct open_file *f, const char *fname, char **file)
45	/* file:	 out */
46{
47	register char *cp;
48	register struct devsw *dp;
49#if 0
50	register char *ncp;
51	register int c, i;
52	char namebuf[20];
53#endif
54	int ctlr = 0, unit = 0, part = 0;
55	int rc;
56
57	cp = (char *)fname;
58#if 0
59	ncp = namebuf;
60
61	/* look for a string like '5/rz0/vmunix' or '5/rz3f/vmunix */
62	if ((c = *cp) >= '0' && c <= '9') {
63		ctlr = c - '0';
64		/* skip the '/' */
65		if (*++cp != '/')
66			return (ENXIO);
67		cp++;
68		while ((c = *cp) != '\0') {
69			if (c == '/')
70				break;
71			if (c >= '0' && c <= '9') {
72				/* read unit number */
73				unit = c - '0';
74
75				/* look for a partition */
76				if ((c = *++cp) >= 'a' && c <= 'h') {
77					part = c - 'a';
78					c = *++cp;
79				}
80				if (c != '/')
81					return (ENXIO);
82				break;
83			}
84			if (ncp < namebuf + sizeof(namebuf) - 1)
85				*ncp++ = c;
86			cp++;
87		}
88		*ncp = '\0';
89	/*
90	 * XXX
91	 * pulling strchr from the C library, should pull from libkern.
92	 */
93	} else if (strchr(cp, '(')) {
94		/* expect a string like 'rz(0,0,0)vmunix' */
95		while ((c = *cp) != '\0') {
96			if (c == '(') {
97				cp++;
98				break;
99			}
100			if (ncp < namebuf + sizeof(namebuf) - 1)
101				*ncp++ = c;
102			cp++;
103		}
104
105		/* get controller number */
106		if ((c = *cp) >= '0' && c <= '9') {
107			ctlr = c - '0';
108			c = *++cp;
109		}
110
111		if (c == ',') {
112			/* get SCSI device number */
113			if ((c = *++cp) >= '0' && c <= '9') {
114				unit = c - '0';
115				c = *++cp;
116			}
117
118			if (c == ',') {
119				/* get partition number */
120				if ((c = *++cp) >= '0' && c <= '9') {
121					part = c - '0';
122					c = *++cp;
123				}
124			}
125		}
126		if (c != ')')
127			return (ENXIO);
128		cp++;
129		*ncp = '\0';
130	} else {
131#endif
132		dp = devsw;
133		ctlr = unit = part = 0;
134		goto fnd;
135#if 0
136	}
137
138	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
139		if (dp->dv_name && strcmp(namebuf, dp->dv_name) == 0)
140			goto fnd;
141	printf("Unknown device '%s'\nKnown devices are:", namebuf);
142	for (dp = devsw, i = 0; i < ndevs; dp++, i++)
143		if (dp->dv_name)
144			printf(" %s", dp->dv_name);
145	printf("\n");
146	return (ENXIO);
147#endif
148
149fnd:
150	rc = (dp->dv_open)(f, ctlr, unit, part);
151	if (rc)
152		return (rc);
153
154	f->f_dev = dp;
155	if (file && *cp != '\0')
156		*file = cp;
157	return (0);
158}
159