devicename.c revision 344377 
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: stable/11/stand/i386/libi386/devicename.c 344377 2019-02-20 19:13:09Z kevans $");
29
30#include <stand.h>
31#include <string.h>
32#include "bootstrap.h"
33#include "disk.h"
34#include "libi386.h"
35#include "libzfs.h"
36
37static int	i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path);
38
39/*
40 * Point (dev) at an allocated device specifier for the device matching the
41 * path in (devspec). If it contains an explicit device specification,
42 * use that.  If not, use the default device.
43 */
44int
45i386_getdev(void **vdev, const char *devspec, const char **path)
46{
47    struct i386_devdesc **dev = (struct i386_devdesc **)vdev;
48    int				rv;
49
50    /*
51     * If it looks like this is just a path and no
52     * device, go with the current device.
53     */
54    if ((devspec == NULL) ||
55	(devspec[0] == '/') ||
56	(strchr(devspec, ':') == NULL)) {
57
58	if (((rv = i386_parsedev(dev, getenv("currdev"), NULL)) == 0) &&
59	    (path != NULL))
60		*path = devspec;
61	return(rv);
62    }
63
64    /*
65     * Try to parse the device name off the beginning of the devspec
66     */
67    return(i386_parsedev(dev, devspec, path));
68}
69
70/*
71 * Point (dev) at an allocated device specifier matching the string version
72 * at the beginning of (devspec).  Return a pointer to the remaining
73 * text in (path).
74 *
75 * In all cases, the beginning of (devspec) is compared to the names
76 * of known devices in the device switch, and then any following text
77 * is parsed according to the rules applied to the device type.
78 *
79 * For disk-type devices, the syntax is:
80 *
81 * disk<unit>[s<slice>][<partition>]:
82 *
83 */
84static int
85i386_parsedev(struct i386_devdesc **dev, const char *devspec, const char **path)
86{
87    struct i386_devdesc *idev;
88    struct devsw	*dv;
89    int			i, unit, err;
90    char		*cp;
91    const char		*np;
92
93    /* minimum length check */
94    if (strlen(devspec) < 2)
95	return(EINVAL);
96
97    /* look for a device that matches */
98    for (i = 0, dv = NULL; devsw[i] != NULL; i++) {
99	if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) {
100	    dv = devsw[i];
101	    break;
102	}
103    }
104    if (dv == NULL)
105	return(ENOENT);
106    idev = malloc(sizeof(struct i386_devdesc));
107    err = 0;
108    np = (devspec + strlen(dv->dv_name));
109
110    switch(dv->dv_type) {
111    case DEVT_NONE:			/* XXX what to do here?  Do we care? */
112	break;
113
114    case DEVT_DISK:
115	err = disk_parsedev((struct disk_devdesc *)idev, np, path);
116	if (err != 0)
117	    goto fail;
118	break;
119
120    case DEVT_CD:
121    case DEVT_NET:
122	unit = 0;
123
124	if (*np && (*np != ':')) {
125	    unit = strtol(np, &cp, 0);	/* get unit number if present */
126	    if (cp == np) {
127		err = EUNIT;
128		goto fail;
129	    }
130	} else {
131		cp = (char *)np;
132	}
133	if (*cp && (*cp != ':')) {
134	    err = EINVAL;
135	    goto fail;
136	}
137
138	idev->dd.d_unit = unit;
139	if (path != NULL)
140	    *path = (*cp == 0) ? cp : cp + 1;
141	break;
142    case DEVT_ZFS:
143	err = zfs_parsedev((struct zfs_devdesc *)idev, np, path);
144	if (err != 0)
145	    goto fail;
146	break;
147    default:
148	err = EINVAL;
149	goto fail;
150    }
151    idev->dd.d_dev = dv;
152    if (dev == NULL) {
153	free(idev);
154    } else {
155	*dev = idev;
156    }
157    return(0);
158
159 fail:
160    free(idev);
161    return(err);
162}
163
164
165char *
166i386_fmtdev(void *vdev)
167{
168    struct i386_devdesc	*dev = (struct i386_devdesc *)vdev;
169    static char		buf[128];	/* XXX device length constant? */
170
171    switch(dev->dd.d_dev->dv_type) {
172    case DEVT_NONE:
173	strcpy(buf, "(no device)");
174	break;
175
176    case DEVT_CD:
177    case DEVT_NET:
178	sprintf(buf, "%s%d:", dev->dd.d_dev->dv_name, dev->dd.d_unit);
179	break;
180
181    case DEVT_DISK:
182	return (disk_fmtdev(vdev));
183
184    case DEVT_ZFS:
185	return(zfs_fmtdev(vdev));
186    }
187    return(buf);
188}
189
190
191/*
192 * Set currdev to suit the value being supplied in (value)
193 */
194int
195i386_setcurrdev(struct env_var *ev, int flags, const void *value)
196{
197    struct i386_devdesc	*ncurr;
198    int			rv;
199
200    if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0)
201	return(rv);
202    free(ncurr);
203    env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL);
204    return(0);
205}
206