devicename.c revision 39673
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 * $Id: devicename.c,v 1.2 1998/08/22 10:31:01 dfr Exp $ 27 */ 28 29#include <stand.h> 30#include <string.h> 31#include <sys/disklabel.h> 32#include "bootstrap.h" 33#include "libalpha.h" 34 35static int alpha_parsedev(struct alpha_devdesc **dev, const char *devspec, const char **path); 36 37/* 38 * Point (dev) at an allocated device specifier for the device matching the 39 * path in (devspec). If it contains an explicit device specification, 40 * use that. If not, use the default device. 41 */ 42int 43alpha_getdev(void **vdev, const char *devspec, const char **path) 44{ 45 struct alpha_devdesc **dev = (struct alpha_devdesc **)vdev; 46 int rv; 47 48 /* 49 * If it looks like this is just a path and no 50 * device, go with the current device. 51 */ 52 if ((devspec == NULL) || 53 (devspec[0] == '/') || 54 (strchr(devspec, ':') == NULL)) { 55 56 if (((rv = alpha_parsedev(dev, getenv("currdev"), NULL)) == 0) && 57 (path != NULL)) 58 *path = devspec; 59 return(rv); 60 } 61 62 /* 63 * Try to parse the device name off the beginning of the devspec 64 */ 65 return(alpha_parsedev(dev, devspec, path)); 66} 67 68/* 69 * Point (dev) at an allocated device specifier matching the string version 70 * at the beginning of (devspec). Return a pointer to the remaining 71 * text in (path). 72 * 73 * In all cases, the beginning of (devspec) is compared to the names 74 * of known devices in the device switch, and then any following text 75 * is parsed according to the rules applied to the device type. 76 * 77 * For disk-type devices, the syntax is: 78 * 79 * disk<unit>[s<slice>][<partition>]: 80 * 81 */ 82static int 83alpha_parsedev(struct alpha_devdesc **dev, const char *devspec, const char **path) 84{ 85 struct alpha_devdesc *idev; 86 struct devsw *dv; 87 int i, unit, slice, partition, err; 88 char *cp; 89 const char *np; 90 91 /* minimum length check */ 92 if (strlen(devspec) < 2) 93 return(EINVAL); 94 95 /* look for a device that matches */ 96 for (i = 0, dv = NULL; devsw[i] != NULL; i++) { 97 if (!strncmp(devspec, devsw[i]->dv_name, strlen(devsw[i]->dv_name))) { 98 dv = devsw[i]; 99 break; 100 } 101 } 102 103 if (dv == NULL) 104 return(ENOENT); 105 idev = malloc(sizeof(struct alpha_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.srmdisk.unit = unit; 146 idev->d_kind.srmdisk.slice = slice; 147 idev->d_kind.srmdisk.partition = partition; 148 if (path != NULL) 149 *path = (*cp == 0) ? cp : cp + 1; 150 break; 151 152 case DEVT_NET: 153 unit = 0; 154 155 if (*np && (*np != ':')) { 156 unit = strtol(np, &cp, 0); /* get unit number if present */ 157 if (cp == np) { 158 err = EUNIT; 159 goto fail; 160 } 161 } 162 if (*cp && (*cp != ':')) { 163 err = EINVAL; 164 goto fail; 165 } 166 167 idev->d_kind.netif.unit = unit; 168 if (path != NULL) 169 *path = (*cp == 0) ? cp : cp + 1; 170 break; 171 172 default: 173 err = EINVAL; 174 goto fail; 175 } 176 idev->d_dev = dv; 177 idev->d_type = dv->dv_type; 178 if (dev == NULL) { 179 free(idev); 180 } else { 181 *dev = idev; 182 } 183 return(0); 184 185 fail: 186 free(idev); 187 return(err); 188} 189 190 191char * 192alpha_fmtdev(void *vdev) 193{ 194 struct alpha_devdesc *dev = (struct alpha_devdesc *)vdev; 195 static char buf[128]; /* XXX device length constant? */ 196 char *cp; 197 198 switch(dev->d_type) { 199 case DEVT_NONE: 200 strcpy(buf, "(no device)"); 201 break; 202 203 case DEVT_DISK: 204 cp = buf; 205 cp += sprintf(cp, "%s%d", dev->d_dev->dv_name, dev->d_kind.srmdisk.unit); 206 if (dev->d_kind.srmdisk.slice > 0) 207 cp += sprintf(cp, "s%d", dev->d_kind.srmdisk.slice); 208 if (dev->d_kind.srmdisk.partition >= 0) 209 cp += sprintf(cp, "%c", dev->d_kind.srmdisk.partition + 'a'); 210 strcat(cp, ":"); 211 break; 212 213 case DEVT_NET: 214 sprintf(buf, "%s%d:", dev->d_dev->dv_name, dev->d_kind.netif.unit); 215 break; 216 } 217 return(buf); 218} 219 220 221/* 222 * Set currdev to suit the value being supplied in (value) 223 */ 224int 225alpha_setcurrdev(struct env_var *ev, int flags, void *value) 226{ 227 struct alpha_devdesc *ncurr; 228 int rv; 229 230 if ((rv = alpha_parsedev(&ncurr, value, NULL)) != 0) 231 return(rv); 232 free(ncurr); 233 env_setenv(ev->ev_name, flags | EV_NOHOOK, value, NULL, NULL); 234 return(0); 235} 236 237