disklabel.c revision 1.4
1 /* 2 * Copyright (c) 1983, 1987 Regents of the University of California. 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 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 /*static char *sccsid = "from: @(#)disklabel.c 5.17 (Berkeley) 2/23/91";*/ 36 static char *rcsid = "$Id: disklabel.c,v 1.4 1993/11/11 19:04:22 jtc Exp $"; 37 #endif /* LIBC_SCCS and not lint */ 38 39 #include <sys/param.h> 40 #include <sys/errno.h> 41 #include <ufs/fs.h> 42 #include <sys/file.h> 43 #define DKTYPENAMES 44 #include <sys/disklabel.h> 45 #include <stdio.h> 46 #include <string.h> 47 #include <stdlib.h> 48 #include <unistd.h> 49 50 static char *dgetstr(); 51 static int dgetent(); 52 static int dnamatch(); 53 static int dgetnum(); 54 static int dgetflag(); 55 static int gettype(); 56 static void error(); 57 58 struct disklabel * 59 getdiskbyname(name) 60 const char *name; 61 { 62 static struct disklabel disk; 63 static char boot[BUFSIZ]; 64 char localbuf[BUFSIZ]; 65 char buf[BUFSIZ]; 66 char *cp, *cq; /* can't be register */ 67 register struct disklabel *dp = &disk; 68 register struct partition *pp; 69 char p, max, psize[3], pbsize[3], 70 pfsize[3], poffset[3], ptype[3]; 71 u_long *dx; 72 73 if (dgetent(buf, name) <= 0) 74 return ((struct disklabel *)0); 75 bzero((char *)&disk, sizeof(disk)); 76 /* 77 * typename 78 */ 79 cq = dp->d_typename; 80 cp = buf; 81 while (cq < dp->d_typename + sizeof(dp->d_typename) - 1 && 82 (*cq = *cp) && *cq != '|' && *cq != ':') 83 cq++, cp++; 84 *cq = '\0'; 85 /* 86 * boot name (optional) xxboot, bootxx 87 */ 88 cp = boot; 89 dp->d_boot0 = dgetstr("b0", &cp); 90 dp->d_boot1 = dgetstr("b1", &cp); 91 cp = localbuf; 92 cq = dgetstr("ty", &cp); 93 if (cq && strcmp(cq, "removable") == 0) 94 dp->d_flags |= D_REMOVABLE; 95 else if (cq && strcmp(cq, "simulated") == 0) 96 dp->d_flags |= D_RAMDISK; 97 if (dgetflag("sf")) 98 dp->d_flags |= D_BADSECT; 99 100 #define getnumdflt(field, dname, dflt) \ 101 { int f = dgetnum(dname); \ 102 (field) = f == -1 ? (dflt) : f; } 103 104 getnumdflt(dp->d_secsize, "se", DEV_BSIZE); 105 dp->d_ntracks = dgetnum("nt"); 106 dp->d_nsectors = dgetnum("ns"); 107 dp->d_ncylinders = dgetnum("nc"); 108 cq = dgetstr("dt", &cp); 109 if (cq) 110 dp->d_type = gettype(cq, dktypenames); 111 else 112 getnumdflt(dp->d_type, "dt", 0); 113 getnumdflt(dp->d_secpercyl, "sc", dp->d_nsectors * dp->d_ntracks); 114 getnumdflt(dp->d_secperunit, "su", dp->d_secpercyl * dp->d_ncylinders); 115 getnumdflt(dp->d_rpm, "rm", 3600); 116 getnumdflt(dp->d_interleave, "il", 1); 117 getnumdflt(dp->d_trackskew, "sk", 0); 118 getnumdflt(dp->d_cylskew, "cs", 0); 119 getnumdflt(dp->d_headswitch, "hs", 0); 120 getnumdflt(dp->d_trkseek, "ts", 0); 121 getnumdflt(dp->d_bbsize, "bs", BBSIZE); 122 getnumdflt(dp->d_sbsize, "sb", SBSIZE); 123 strcpy(psize, "px"); 124 strcpy(pbsize, "bx"); 125 strcpy(pfsize, "fx"); 126 strcpy(poffset, "ox"); 127 strcpy(ptype, "tx"); 128 max = 'a' - 1; 129 pp = &dp->d_partitions[0]; 130 for (p = 'a'; p < 'a' + MAXPARTITIONS; p++, pp++) { 131 psize[1] = pbsize[1] = pfsize[1] = poffset[1] = ptype[1] = p; 132 pp->p_size = dgetnum(psize); 133 if (pp->p_size == -1) 134 pp->p_size = 0; 135 else { 136 pp->p_offset = dgetnum(poffset); 137 getnumdflt(pp->p_fsize, pfsize, 0); 138 if (pp->p_fsize) 139 pp->p_frag = dgetnum(pbsize) / pp->p_fsize; 140 getnumdflt(pp->p_fstype, ptype, 0); 141 if (pp->p_fstype == 0 && (cq = dgetstr(ptype, &cp))) 142 pp->p_fstype = gettype(cq, fstypenames); 143 max = p; 144 } 145 } 146 dp->d_npartitions = max + 1 - 'a'; 147 (void)strcpy(psize, "dx"); 148 dx = dp->d_drivedata; 149 for (p = '0'; p < '0' + NDDATA; p++, dx++) { 150 psize[1] = p; 151 getnumdflt(*dx, psize, 0); 152 } 153 dp->d_magic = DISKMAGIC; 154 dp->d_magic2 = DISKMAGIC; 155 return (dp); 156 } 157 158 #include <ctype.h> 159 160 static char *tbuf; 161 static char *dskip(); 162 static char *ddecode(); 163 164 /* 165 * Get an entry for disk name in buffer bp, 166 * from the diskcap file. Parse is very rudimentary; 167 * we just notice escaped newlines. 168 */ 169 static int 170 dgetent(bp, name) 171 char *bp, *name; 172 { 173 register char *cp; 174 register int c; 175 register int i = 0, cnt = 0; 176 char ibuf[BUFSIZ]; 177 int tf; 178 179 tbuf = bp; 180 tf = open(_PATH_DISKTAB, 0); 181 if (tf < 0) { 182 error(errno); 183 return (-1); 184 } 185 for (;;) { 186 cp = bp; 187 for (;;) { 188 if (i == cnt) { 189 cnt = read(tf, ibuf, BUFSIZ); 190 if (cnt <= 0) { 191 error(errno); 192 close(tf); 193 return (0); 194 } 195 i = 0; 196 } 197 c = ibuf[i++]; 198 if (c == '\n') { 199 if (cp > bp && cp[-1] == '\\'){ 200 cp--; 201 continue; 202 } 203 break; 204 } 205 if (cp >= bp+BUFSIZ) { 206 error(EFTYPE); 207 break; 208 } else 209 *cp++ = c; 210 } 211 *cp = 0; 212 213 /* 214 * The real work for the match. 215 */ 216 if (dnamatch(name)) { 217 close(tf); 218 return (1); 219 } 220 } 221 } 222 223 /* 224 * Dnamatch deals with name matching. The first field of the disktab 225 * entry is a sequence of names separated by |'s, so we compare 226 * against each such name. The normal : terminator after the last 227 * name (before the first field) stops us. 228 */ 229 static int 230 dnamatch(np) 231 char *np; 232 { 233 register char *Np, *Bp; 234 235 Bp = tbuf; 236 if (*Bp == '#') 237 return (0); 238 for (;;) { 239 for (Np = np; *Np && *Bp == *Np; Bp++, Np++) 240 continue; 241 if (*Np == 0 && (*Bp == '|' || *Bp == ':' || *Bp == 0)) 242 return (1); 243 while (*Bp && *Bp != ':' && *Bp != '|') 244 Bp++; 245 if (*Bp == 0 || *Bp == ':') 246 return (0); 247 Bp++; 248 } 249 } 250 251 /* 252 * Skip to the next field. Notice that this is very dumb, not 253 * knowing about \: escapes or any such. If necessary, :'s can be put 254 * into the diskcap file in octal. 255 */ 256 static char * 257 dskip(bp) 258 register char *bp; 259 { 260 261 while (*bp && *bp != ':') 262 bp++; 263 if (*bp == ':') 264 bp++; 265 return (bp); 266 } 267 268 /* 269 * Return the (numeric) option id. 270 * Numeric options look like 271 * li#80 272 * i.e. the option string is separated from the numeric value by 273 * a # character. If the option is not found we return -1. 274 * Note that we handle octal numbers beginning with 0. 275 */ 276 static int 277 dgetnum(id) 278 char *id; 279 { 280 register int i, base; 281 register char *bp = tbuf; 282 283 for (;;) { 284 bp = dskip(bp); 285 if (*bp == 0) 286 return (-1); 287 if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) 288 continue; 289 if (*bp == '@') 290 return (-1); 291 if (*bp != '#') 292 continue; 293 bp++; 294 base = 10; 295 if (*bp == '0') 296 base = 8; 297 i = 0; 298 while (isdigit(*bp)) 299 i *= base, i += *bp++ - '0'; 300 return (i); 301 } 302 } 303 304 /* 305 * Handle a flag option. 306 * Flag options are given "naked", i.e. followed by a : or the end 307 * of the buffer. Return 1 if we find the option, or 0 if it is 308 * not given. 309 */ 310 static int 311 dgetflag(id) 312 char *id; 313 { 314 register char *bp = tbuf; 315 316 for (;;) { 317 bp = dskip(bp); 318 if (!*bp) 319 return (0); 320 if (*bp++ == id[0] && *bp != 0 && *bp++ == id[1]) { 321 if (!*bp || *bp == ':') 322 return (1); 323 else if (*bp == '@') 324 return (0); 325 } 326 } 327 } 328 329 /* 330 * Get a string valued option. 331 * These are given as 332 * cl=^Z 333 * Much decoding is done on the strings, and the strings are 334 * placed in area, which is a ref parameter which is updated. 335 * No checking on area overflow. 336 */ 337 static char * 338 dgetstr(id, area) 339 char *id, **area; 340 { 341 register char *bp = tbuf; 342 343 for (;;) { 344 bp = dskip(bp); 345 if (!*bp) 346 return (0); 347 if (*bp++ != id[0] || *bp == 0 || *bp++ != id[1]) 348 continue; 349 if (*bp == '@') 350 return (0); 351 if (*bp != '=') 352 continue; 353 bp++; 354 return (ddecode(bp, area)); 355 } 356 } 357 358 /* 359 * Tdecode does the grung work to decode the 360 * string capability escapes. 361 */ 362 static char * 363 ddecode(str, area) 364 register char *str; 365 char **area; 366 { 367 register char *cp; 368 register int c; 369 register char *dp; 370 int i; 371 372 cp = *area; 373 while ((c = *str++) && c != ':') { 374 switch (c) { 375 376 case '^': 377 c = *str++ & 037; 378 break; 379 380 case '\\': 381 dp = "E\033^^\\\\::n\nr\rt\tb\bf\f"; 382 c = *str++; 383 nextc: 384 if (*dp++ == c) { 385 c = *dp++; 386 break; 387 } 388 dp++; 389 if (*dp) 390 goto nextc; 391 if (isdigit(c)) { 392 c -= '0', i = 2; 393 do 394 c <<= 3, c |= *str++ - '0'; 395 while (--i && isdigit(*str)); 396 } 397 break; 398 } 399 *cp++ = c; 400 } 401 *cp++ = 0; 402 str = *area; 403 *area = cp; 404 return (str); 405 } 406 407 static int 408 gettype(t, names) 409 char *t; 410 char **names; 411 { 412 register char **nm; 413 414 for (nm = names; *nm; nm++) 415 if (strcasecmp(t, *nm) == 0) 416 return (nm - names); 417 if (isdigit(*t)) 418 return (atoi(t)); 419 return (0); 420 } 421 422 static void 423 error(err) 424 int err; 425 { 426 char *p; 427 428 (void)write(STDERR_FILENO, "disktab: ", 9); 429 (void)write(STDERR_FILENO, _PATH_DISKTAB, sizeof(_PATH_DISKTAB) - 1); 430 p = strerror(err); 431 (void)write(STDERR_FILENO, p, strlen(p)); 432 (void)write(STDERR_FILENO, "\n", 1); 433 } 434
Indexes created Tue Sep 23 07:09:52 GMT 2025