devicename.c revision 181282
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 181282 2008-08-04 07:01:42Z cperciva $"); 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 == 'p') { /* got a GPT partition */ 124 np = cp + 1; 125 slice = strtol(np, &cp, 10); 126 if (cp == np) { 127 err = ESLICE; 128 goto fail; 129 } 130 if (*cp && (*cp != ':')) { 131 err = EINVAL; 132 goto fail; 133 } 134 partition = 0xff; 135 } else { 136 if (*cp == 's') { /* got a slice number */ 137 np = cp + 1; 138 slice = strtol(np, &cp, 10); 139 if (cp == np) { 140 err = ESLICE; 141 goto fail; 142 } 143 } 144 if (*cp && (*cp != ':')) { 145 partition = *cp - 'a'; /* got a partition number */ 146 if ((partition < 0) || (partition >= MAXPARTITIONS)) { 147 err = EPART; 148 goto fail; 149 } 150 cp++; 151 } 152 } 153 } else { 154 cp = np; 155 } 156 if (*cp && (*cp != ':')) { 157 err = EINVAL; 158 goto fail; 159 } 160 161 idev->d_unit = unit; 162 idev->d_kind.biosdisk.slice = slice; 163 idev->d_kind.biosdisk.partition = partition; 164 if (path != NULL) 165 *path = (*cp == 0) ? cp : cp + 1; 166 break; 167 168 case DEVT_CD: 169 case DEVT_NET: 170 unit = 0; 171 172 if (*np && (*np != ':')) { 173 unit = strtol(np, &cp, 0); /* get unit number if present */ 174 if (cp == np) { 175 err = EUNIT; 176 goto fail; 177 } 178 } else { 179 cp = np; 180 } 181 if (*cp && (*cp != ':')) { 182 err = EINVAL; 183 goto fail; 184 } 185 186 idev->d_unit = unit; 187 if (path != NULL) 188 *path = (*cp == 0) ? cp : cp + 1; 189 break; 190 191 default: 192 err = EINVAL; 193 goto fail; 194 } 195 idev->d_dev = dv; 196 idev->d_type = dv->dv_type; 197 if (dev == NULL) { 198 free(idev); 199 } else { 200 *dev = idev; 201 } 202 return(0); 203 204 fail: 205 free(idev); 206 return(err); 207} 208 209 210char * 211i386_fmtdev(void *vdev) 212{ 213 struct i386_devdesc *dev = (struct i386_devdesc *)vdev; 214 static char buf[128]; /* XXX device length constant? */ 215 char *cp; 216 217 switch(dev->d_type) { 218 case DEVT_NONE: 219 strcpy(buf, "(no device)"); 220 break; 221 222 case DEVT_CD: 223 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 224 break; 225 226 case DEVT_DISK: 227 cp = buf; 228 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_unit); 229 if (dev->d_kind.biosdisk.partition == 0xff) { 230 cp += sprintf(cp, "p%d", dev->d_kind.biosdisk.slice); 231 } else { 232 if (dev->d_kind.biosdisk.slice > 0) 233 cp += sprintf(cp, "s%d", dev->d_kind.biosdisk.slice); 234 if (dev->d_kind.biosdisk.partition >= 0) 235 cp += sprintf(cp, "%c", dev->d_kind.biosdisk.partition + 'a'); 236 } 237 strcat(cp, ":"); 238 break; 239 240 case DEVT_NET: 241 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_unit); 242 break; 243 } 244 return(buf); 245} 246 247 248/* 249 * Set currdev to suit the value being supplied in (value) 250 */ 251int 252i386_setcurrdev(struct env_var *ev, int flags, const void *value) 253{ 254 struct i386_devdesc *ncurr; 255 int rv; 256 257 if ((rv = i386_parsedev(&ncurr, value, NULL)) != 0) 258 return(rv); 259 free(ncurr); 260 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 261 return(0); 262} 263