devicename.c revision 119482 
1/*-
2 * Copyright (c) 1998 Michael Smith <msmith@freebsd.org>
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 *
14 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17 * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24 * SUCH DAMAGE.
25 */
26
27#include <sys/cdefs.h>
28__FBSDID("$FreeBSD: head/sys/boot/i386/libi386/devicename.c 119482 2003-08-25 23:28:32Z obrien $");
29
30#include <stand.h>
31#include <string.h>
32#include <sys/disklabel.h>
33#include "bootstrap.h"
34#include "libi386.h"
35
36static int	i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path);
37
38/*
39 * Point (dev) at an allocated device specifier for the device matching the
40 * path in (devspec). If it contains an explicit device specification,
41 * use that.  If not, use the default device.
42 */
43int
44i386_getdev(void **vdev, const char *devspec, const char **path)
45{
46    struct i386_devdesc **dev = (struct i386_devdesc **)vdev;
47    int				rv;
48
49    /*
50     * If it looks like this is just a path and no
51     * device, go with the current device.
52     */
53    if ((devspec == NULL) ||
54	(devspec[0] == '/') ||
55	(strchr(devspec, ':') == NULL)) {
56
57	if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
58	    (path != NULL))
59		*path = devspec;
60	return(rv);
61    }
62
63    /*
64     * Try to parse the device name off the beginning of the devspec
65     */
66    return(i386_parsedev(dev, devspec, path));
67}
68
69/*
70 * Point (dev) at an allocated device specifier matching the string version
71 * at the beginning of (devspec).  Return a pointer to the remaining
72 * text in (path).
73 *
74 * In all cases, the beginning of (devspec) is compared to the names
75 * of known devices in the device switch, and then any following text
76 * is parsed according to the rules applied to the device type.
77 *
78 * For disk-type devices, the syntax is:
79 *
80 * disk<unit>[s<slice>][<partition>]:
81 *
82 */
83static int
84i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path)
85{
86    struct i386_devdesc *idev;
87    struct devsw	*dv;
88    int			i, unit, slice, partition, err;
89    char		*cp;
90    const char		*np;
91
92    /* minimum length check */
93    if (strlen(devspec) < 2)
94	return(EINVAL);
95
96    /* look for a device that matches */
97    for (i = 0, dv = NULL; devsw[i] != NULL; i++) {
98	if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) {
99	    dv = devsw[i];
100	    break;
101	}
102    }
103    if (dv == NULL)
104	return(ENOENT);
105    idev = malloc(sizeof(struct i386_devdesc));
106    err = 0;
107    np = (devspec + strlen(dv->dv_name));
108
109    switch(dv->dv_type) {
110    case DEVT_NONE:			/* XXX what to do here?  Do we care? */
111	break;
112
113    case DEVT_DISK:
114	unit = -1;
115	slice = -1;
116	partition = -1;
117	if (*np && (*np != ':')) {
118	    unit = strtol(np, &cp, 10);	/* next comes the unit number */
119	    if (cp == np) {
120		err = EUNIT;
121		goto fail;
122	    }
123	    if (*cp == 's') {		/* got a slice number */
124		np = cp + 1;
125		slice = strtol(np, &cp, 10);
126		if (cp == np) {
127		    err = ESLICE;
128		    goto fail;
129		}
130	    }
131	    if (*cp && (*cp != ':')) {
132		partition = *cp - 'a';		/* get a partition number */
133		if ((partition < 0) || (partition >= MAXPARTITIONS)) {
134		    err = EPART;
135		    goto fail;
136		}
137		cp++;
138	    }
139	}
140	if (*cp && (*cp != ':')) {
141	    err = EINVAL;
142	    goto fail;
143	}
144
145	idev->d_kind.biosdisk.unit = unit;
146	idev->d_kind.biosdisk.slice = slice;
147	idev->d_kind.biosdisk.partition = partition;
148	if (path != NULL)
149	    *path = (*cp == 0) ? cp : cp + 1;
150	break;
151
152    case DEVT_CD:
153    case DEVT_NET:
154	unit = 0;
155
156	if (*np && (*np != ':')) {
157	    unit = strtol(np, &cp, 0);	/* get unit number if present */
158	    if (cp == np) {
159		err = EUNIT;
160		goto fail;
161	    }
162	}
163	if (*cp && (*cp != ':')) {
164	    err = EINVAL;
165	    goto fail;
166	}
167
168	if (dv->dv_type == DEVT_NET)
169	    idev->d_kind.netif.unit = unit;
170	else
171	    idev->d_kind.bioscd.unit = unit;
172	if (path != NULL)
173	    *path = (*cp == 0) ? cp : cp + 1;
174	break;
175
176    default:
177	err = EINVAL;
178	goto fail;
179    }
180    idev->d_dev = dv;
181    idev->d_type = dv->dv_type;
182    if (dev == NULL) {
183	free(idev);
184    } else {
185	*dev = idev;
186    }
187    return(0);
188
189 fail:
190    free(idev);
191    return(err);
192}
193
194
195char *
196i386_fmtdev(void *vdev)
197{
198    struct i386_devdesc	*dev = (struct i386_devdesc *)vdev;
199    static char		buf[128];	/* XXX device length constant? */
200    char		*cp;
201
202    switch(dev->d_type) {
203    case DEVT_NONE:
204	strcpy(buf, "(no device)");
205	break;
206
207    case DEVT_CD:
208	sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.bioscd.unit);
209	break;
210
211    case DEVT_DISK:
212	cp = buf;
213	cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.biosdisk.unit);
214	if (dev->d_kind.biosdisk.slice > 0)
215	    cp += sprintf(cp, "s%d", dev->d_kind.biosdisk.slice);
216	if (dev->d_kind.biosdisk.partition >= 0)
217	    cp += sprintf(cp, "%c", dev->d_kind.biosdisk.partition + 'a');
218	strcat(cp, ":");
219	break;
220
221    case DEVT_NET:
222	sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit);
223	break;
224    }
225    return(buf);
226}
227
228
229/*
230 * Set currdev to suit the value being supplied in (value)
231 */
232int
233i386_setcurrdev(struct env_var *ev, int flags, void *value)
234{
235    struct i386_devdesc	*ncurr;
236    int			rv;
237
238    if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0)
239	return(rv);
240    free(ncurr);
241    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
242    return(0);
243}
244
245