1/*	$NetBSD: devopen.c,v 1.2 2001/05/28 15:53:51 kleink Exp $	*/
2
3/*-
4 *  Copyright (c) 1993 John Brezak
5 *  All rights reserved.
6 *
7 *  Redistribution and use in source and binary forms, with or without
8 *  modification, are permitted provided that the following conditions
9 *  are met:
10 *  1. Redistributions of source code must retain the above copyright
11 *     notice, this list of conditions and the following disclaimer.
12 *  2. Redistributions in binary form must reproduce the above copyright
13 *     notice, this list of conditions and the following disclaimer in the
14 *     documentation and/or other materials provided with the distribution.
15 *  3. The name of the author may not be used to endorse or promote products
16 *     derived from this software without specific prior written permission.
17 *
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR `AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
20 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
21 * DISCLAIMED.	IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT,
22 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
23 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
24 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
26 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
27 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
28 * POSSIBILITY OF SUCH DAMAGE.
29 */
30
31#include <lib/libsa/stand.h>
32#include <lib/libkern/libkern.h>
33
34#define	ispart(c)	((c) >= 'a' && (c) <= 'h')
35
36int atoi(char *);
37int devlookup(char *);
38int devparse(const char *, int *, int *, int *, int *, int *, char **);
39
40int
41atoi(char *cp)
42{
43	int val = 0;
44
45	while (isdigit(*cp))
46		val = val * 10 + (*cp++ - '0');
47	return (val);
48}
49
50int
51devlookup(char *d)
52{
53	struct devsw *dp = devsw;
54	int i;
55
56	for (i = 0; i < ndevs; i++, dp++)
57		if (dp->dv_name && strcmp(dp->dv_name, d) == 0)
58			return (i);
59
60	printf("No such device - Configured devices are:\n");
61	for (dp = devsw, i = 0; i < ndevs; i++, dp++)
62		if (dp->dv_name)
63			printf(" %s", dp->dv_name);
64	printf("\n");
65	return (-1);
66}
67
68/*
69 * Parse a device spec in one of two forms.
70 *   dev(ctlr, unit, part)file
71 */
72int
73devparse(const char *fname, int *dev, int *adapt, int *ctlr, int *unit,
74	int *part, char **file)
75{
76	int argc, flag;
77	char *s, *args[3];
78	extern char nametmp[];
79
80	/* get device name and make lower case */
81	strcpy(nametmp, (char *)fname);
82	for (s = nametmp; *s && *s != '('; s++)
83		if (isupper(*s)) *s = tolower(*s);
84
85	if (*s == '(') {
86		/* lookup device and get index */
87		*s = NULL;
88		if ((*dev = devlookup(nametmp)) < 0)
89		    goto baddev;
90
91		/* tokenize device ident */
92		for (++s, flag = 0, argc = 0; *s && *s != ')'; s++) {
93			if (*s != ',') {
94				if (!flag) {
95					flag++;
96					args[argc++] = s;
97				}
98			} else {
99				if (flag) {
100					*s = NULL;
101					flag = 0;
102				}
103			}
104		}
105		if (*s == ')')
106			*s = NULL;
107
108		switch (argc) {
109		case 3:
110		    *part = atoi(args[2]);
111		    /* FALL THROUGH */
112		case 2:
113		    *unit = atoi(args[1]);
114		    /* FALL THROUGH */
115		case 1:
116		    *ctlr = atoi(args[0]);
117		    break;
118		}
119		*file = ++s;
120	} else {
121		/* no device present */
122		*file = (char *)fname;
123	}
124	return (0);
125
126baddev:
127	return (EINVAL);
128}
129
130int
131devopen(struct open_file *f, const char *fname, char **file)
132{
133	int error;
134	int dev = 0, ctlr = 0, unit = 0, part = 0;
135	int adapt = 0;
136	struct devsw *dp = &devsw[0];
137
138	if ((error =
139	    devparse(fname, &dev, &adapt, &ctlr, &unit, &part, file)) != 0)
140		return (error);
141
142	dp = &devsw[dev];
143	if (!dp->dv_open)
144		return (ENODEV);
145
146	f->f_dev = dp;
147	if ((error = (*dp->dv_open)(f, ctlr, unit, part)) == 0)
148		return (0);
149
150	printf("%s(%d,%d,%d): %s\n", devsw[dev].dv_name,
151		ctlr, unit, part, strerror(error));
152
153	return (error);
154}
155