sbin/bsdlabel/bsdlabel.c

   1 /*
   2  * Copyright (c) 1994, 1995 Gordon W. Ross
   3  * Copyright (c) 1994 Theo de Raadt
   4  * All rights reserved.
   5  * Copyright (c) 1987, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Symmetric Computer Systems.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. All advertising materials mentioning features or use of this software
  20  *    must display the following acknowledgement:
  21  *      This product includes software developed by the University of
  22  *      California, Berkeley and its contributors.
  23  *      This product includes software developed by Theo de Raadt.
  24  * 4. Neither the name of the University nor the names of its contributors
  25  *    may be used to endorse or promote products derived from this software
  26  *    without specific prior written permission.
  27  *
  28  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  29  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  30  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  31  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  32  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  33  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  34  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  35  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  36  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  37  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  38  * SUCH DAMAGE.
  39  *
  40  *      from: $NetBSD: disksubr.c,v 1.13 2000/12/17 22:39:18 pk $
  41  */
  42
  43 #if 0
  44 #ifndef lint
  45 static const char copyright[] =
  46 "@(#) Copyright (c) 1987, 1993\n\
  47         The Regents of the University of California.  All rights reserved.\n";
  48 #endif /* not lint */
  49
  50 #ifndef lint
  51 static char sccsid[] = "@(#)disklabel.c 8.2 (Berkeley) 1/7/94";
  52 /* from static char sccsid[] = "@(#)disklabel.c 1.2 (Symmetric) 11/28/85"; */
  53 #endif /* not lint */
  54 #endif
  55 #include <sys/cdefs.h>
  56 __FBSDID("$FreeBSD$");
  57
  58 #include <sys/param.h>
  59 #include <stdint.h>
  60 #include <sys/file.h>
  61 #include <sys/stat.h>
  62 #include <sys/wait.h>
  63 #include <sys/disk.h>
  64 #define DKTYPENAMES
  65 #define FSTYPENAMES
  66 #define MAXPARTITIONS   26
  67 #include <sys/disklabel.h>
  68
  69 #include <unistd.h>
  70 #include <string.h>
  71 #include <stdio.h>
  72 #include <libgeom.h>
  73 #include <stdlib.h>
  74 #include <signal.h>
  75 #include <stdarg.h>
  76 #include <ctype.h>
  77 #include <err.h>
  78 #include <errno.h>
  79
  80 #include "pathnames.h"
  81
  82 static void     makelabel(const char *, struct disklabel *);
  83 static int      geom_bsd_available(void);
  84 static int      writelabel(void);
  85 static int      readlabel(int flag);
  86 static void     display(FILE *, const struct disklabel *);
  87 static int      edit(void);
  88 static int      editit(void);
  89 static void     fixlabel(struct disklabel *);
  90 static char     *skip(char *);
  91 static char     *word(char *);
  92 static int      getasciilabel(FILE *, struct disklabel *);
  93 static int      getasciipartspec(char *, struct disklabel *, int, int);
  94 static int      checklabel(struct disklabel *);
  95 static void     usage(void);
  96 static struct disklabel *getvirginlabel(void);
  97
  98 #define DEFEDITOR       _PATH_VI
  99 #define DEFPARTITIONS   8
 100
 101 static char     *specname;
 102 static char     *pname;
 103 static char     tmpfil[] = PATH_TMPFILE;
 104
 105 static struct   disklabel lab;
 106 static u_char   bootarea[BBSIZE];
 107 static off_t    mediasize;
 108 static ssize_t  secsize;
 109 static char     blank[] = "";
 110 static char     unknown[] = "unknown";
 111
 112 #define MAX_PART ('z')
 113 #define MAX_NUM_PARTS (1 + MAX_PART - 'a')
 114 static char    part_size_type[MAX_NUM_PARTS];
 115 static char    part_offset_type[MAX_NUM_PARTS];
 116 static int     part_set[MAX_NUM_PARTS];
 117
 118 static int      installboot;    /* non-zero if we should install a boot program */
 119 static int      allfields;      /* present all fields in edit */
 120 static char const *xxboot;      /* primary boot */
 121
 122 static uint32_t lba_offset;
 123 #ifndef LABELSECTOR
 124 #define LABELSECTOR -1
 125 #endif
 126 #ifndef LABELOFFSET
 127 #define LABELOFFSET -1
 128 #endif
 129 static int labelsoffset = LABELSECTOR;
 130 static int labeloffset = LABELOFFSET;
 131 static int bbsize = BBSIZE;
 132
 133 enum    {
 134         UNSPEC, EDIT, READ, RESTORE, WRITE, WRITEBOOT
 135 } op = UNSPEC;
 136
 137
 138 static int      disable_write;   /* set to disable writing to disk label */
 139 static int      is_file;        /* work on a file (abs. pathname), "-f" opt. */
 140
 141 int
 142 main(int argc, char *argv[])
 143 {
 144         FILE *t;
 145         int ch, error, fd;
 146         const char *name;
 147
 148         error = 0;
 149         name = NULL;
 150
 151         while ((ch = getopt(argc, argv, "ABb:efm:nRrw")) != -1)
 152                 switch (ch) {
 153                         case 'A':
 154                                 allfields = 1;
 155                                 break;
 156                         case 'B':
 157                                 ++installboot;
 158                                 break;
 159                         case 'b':
 160                                 xxboot = optarg;
 161                                 break;
 162                         case 'f':
 163                                 is_file=1;
 164                                 break;
 165                         case 'm':
 166                                 if (!strcmp(optarg, "i386") ||
 167                                     !strcmp(optarg, "amd64") ||
 168                                     !strcmp(optarg, "ia64") ||
 169                                     !strcmp(optarg, "pc98")) {
 170                                         labelsoffset = 1;
 171                                         labeloffset = 0;
 172                                         bbsize = 8192;
 173                                 } else {
 174                                         errx(1, "Unsupported architecture");
 175                                 }
 176                                 break;
 177                         case 'n':
 178                                 disable_write = 1;
 179                                 break;
 180                         case 'R':
 181                                 if (op != UNSPEC)
 182                                         usage();
 183                                 op = RESTORE;
 184                                 break;
 185                         case 'e':
 186                                 if (op != UNSPEC)
 187                                         usage();
 188                                 op = EDIT;
 189                                 break;
 190                         case 'r':
 191                                 /*
 192                                  * We accept and ignode -r for compatibility with
 193                                  * historically disklabel usage.
 194                                  */
 195                                 break;
 196                         case 'w':
 197                                 if (op != UNSPEC)
 198                                         usage();
 199                                 op = WRITE;
 200                                 break;
 201                         case '?':
 202                         default:
 203                                 usage();
 204                 }
 205         argc -= optind;
 206         argv += optind;
 207
 208         if (argc < 1)
 209                 usage();
 210         if (labelsoffset < 0 || labeloffset < 0)
 211                 errx(1, "a -m <architecture> option must be specified");
 212
 213         /* Figure out the names of the thing we're working on */
 214         if (is_file) {
 215                 specname = argv[0];
 216         } else {
 217                 specname = g_device_path(argv[0]);
 218                 if (specname == NULL) {
 219                         warn("unable to get correct path for %s", argv[0]);
 220                         return(1);
 221                 }
 222                 fd = open(specname, O_RDONLY);
 223                 if (fd < 0) {
 224                         warn("error opening %s", specname);
 225                         return(1);
 226                 }
 227                 pname = g_providername(fd);
 228                 if (pname == NULL) {
 229                         warn("error getting providername for %s", specname);
 230                         close(fd);
 231                         return(1);
 232                 }
 233                 close(fd);
 234         }
 235
 236         if (installboot && op == UNSPEC)
 237                 op = WRITEBOOT;
 238         else if (op == UNSPEC)
 239                 op = READ;
 240
 241         switch(op) {
 242
 243         case UNSPEC:
 244                 break;
 245
 246         case EDIT:
 247                 if (argc != 1)
 248                         usage();
 249                 readlabel(1);
 250                 fixlabel(&lab);
 251                 error = edit();
 252                 break;
 253
 254         case READ:
 255                 if (argc != 1)
 256                         usage();
 257                 readlabel(1);
 258                 display(stdout, NULL);
 259                 error = checklabel(NULL);
 260                 break;
 261
 262         case RESTORE:
 263                 if (argc != 2)
 264                         usage();
 265                 if (!(t = fopen(argv[1], "r")))
 266                         err(4, "fopen %s", argv[1]);
 267                 readlabel(0);
 268                 if (!getasciilabel(t, &lab))
 269                         exit(1);
 270                 error = writelabel();
 271                 break;
 272
 273         case WRITE:
 274                 if (argc == 2)
 275                         name = argv[1];
 276                 else if (argc == 1)
 277                         name = "auto";
 278                 else
 279                         usage();
 280                 readlabel(0);
 281                 makelabel(name, &lab);
 282                 fixlabel(&lab);
 283                 if (checklabel(NULL) == 0)
 284                         error = writelabel();
 285                 break;
 286
 287         case WRITEBOOT:
 288
 289                 readlabel(1);
 290                 fixlabel(&lab);
 291                 if (argc == 2)
 292                         makelabel(argv[1], &lab);
 293                 if (checklabel(NULL) == 0)
 294                         error = writelabel();
 295                 break;
 296         }
 297         exit(error);
 298 }
 299
 300 static void
 301 fixlabel(struct disklabel *lp)
 302 {
 303         struct partition *dp;
 304         int i;
 305
 306         for (i = 0; i < lp->d_npartitions; i++) {
 307                 if (i == RAW_PART)
 308                         continue;
 309                 if (lp->d_partitions[i].p_size)
 310                         return;
 311         }
 312
 313         dp = &lp->d_partitions[0];
 314         dp->p_offset = BBSIZE / secsize;
 315         dp->p_size = lp->d_secperunit - dp->p_offset;
 316 }
 317
 318 /*
 319  * Construct a prototype disklabel from /etc/disktab.
 320  */
 321 static void
 322 makelabel(const char *type, struct disklabel *lp)
 323 {
 324         struct disklabel *dp;
 325
 326         if (strcmp(type, "auto") == 0)
 327                 dp = getvirginlabel();
 328         else
 329                 dp = getdiskbyname(type);
 330         if (dp == NULL)
 331                 errx(1, "%s: unknown disk type", type);
 332         *lp = *dp;
 333         bzero(lp->d_packname, sizeof(lp->d_packname));
 334 }
 335
 336 static void
 337 readboot(void)
 338 {
 339         int fd;
 340         struct stat st;
 341
 342         if (xxboot == NULL)
 343                 xxboot = "/boot/boot";
 344         fd = open(xxboot, O_RDONLY);
 345         if (fd < 0)
 346                 err(1, "cannot open %s", xxboot);
 347         fstat(fd, &st);
 348         if (st.st_size <= BBSIZE) {
 349                 if (read(fd, bootarea, st.st_size) != st.st_size)
 350                         err(1, "read error %s", xxboot);
 351                 close(fd);
 352                 return;
 353         }
 354         errx(1, "boot code %s is wrong size", xxboot);
 355 }
 356
 357 static int
 358 geom_bsd_available(void)
 359 {
 360         struct gclass *class;
 361         struct gmesh mesh;
 362         int error;
 363
 364         error = geom_gettree(&mesh);
 365         if (error != 0)
 366                 errc(1, error, "Cannot get GEOM tree");
 367
 368         LIST_FOREACH(class, &mesh.lg_class, lg_class) {
 369                 if (strcmp(class->lg_name, "BSD") == 0) {
 370                         geom_deletetree(&mesh);
 371                         return (1);
 372                 }
 373         }
 374
 375         geom_deletetree(&mesh);
 376
 377         return (0);
 378 }
 379
 380 static int
 381 writelabel(void)
 382 {
 383         int i, fd, serrno;
 384         struct gctl_req *grq;
 385         char const *errstr;
 386         struct disklabel *lp = &lab;
 387
 388         if (disable_write) {
 389                 warnx("write to disk label supressed - label was as follows:");
 390                 display(stdout, NULL);
 391                 return (0);
 392         }
 393
 394         lp->d_magic = DISKMAGIC;
 395         lp->d_magic2 = DISKMAGIC;
 396         lp->d_checksum = 0;
 397         lp->d_checksum = dkcksum(lp);
 398         if (installboot)
 399                 readboot();
 400         for (i = 0; i < lab.d_npartitions; i++)
 401                 if (lab.d_partitions[i].p_size)
 402                         lab.d_partitions[i].p_offset += lba_offset;
 403         bsd_disklabel_le_enc(bootarea + labeloffset + labelsoffset * secsize,
 404             lp);
 405
 406         fd = open(specname, O_RDWR);
 407         if (fd < 0) {
 408                 if (is_file) {
 409                         warn("cannot open file %s for writing label", specname);
 410                         return(1);
 411                 } else
 412                         serrno = errno;
 413
 414                 /* Give up if GEOM_BSD is not available. */
 415                 if (geom_bsd_available() == 0) {
 416                         warnc(serrno, "%s", specname);
 417                         return (1);
 418                 }
 419
 420                 grq = gctl_get_handle();
 421                 gctl_ro_param(grq, "verb", -1, "write label");
 422                 gctl_ro_param(grq, "class", -1, "BSD");
 423                 gctl_ro_param(grq, "geom", -1, pname);
 424                 gctl_ro_param(grq, "label", 148+16*8,
 425                         bootarea + labeloffset + labelsoffset * secsize);
 426                 errstr = gctl_issue(grq);
 427                 if (errstr != NULL) {
 428                         warnx("%s", errstr);
 429                         gctl_free(grq);
 430                         return(1);
 431                 }
 432                 gctl_free(grq);
 433                 if (installboot) {
 434                         grq = gctl_get_handle();
 435                         gctl_ro_param(grq, "verb", -1, "write bootcode");
 436                         gctl_ro_param(grq, "class", -1, "BSD");
 437                         gctl_ro_param(grq, "geom", -1, pname);
 438                         gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
 439                         errstr = gctl_issue(grq);
 440                         if (errstr != NULL) {
 441                                 warnx("%s", errstr);
 442                                 gctl_free(grq);
 443                                 return (1);
 444                         }
 445                         gctl_free(grq);
 446                 }
 447         } else {
 448                 if (write(fd, bootarea, bbsize) != bbsize) {
 449                         warn("write %s", specname);
 450                         close (fd);
 451                         return (1);
 452                 }
 453                 close (fd);
 454         }
 455         return (0);
 456 }
 457
 458 static void
 459 get_file_parms(int f)
 460 {
 461         int i;
 462         struct stat sb;
 463
 464         if (fstat(f, &sb) != 0)
 465                 err(4, "fstat failed");
 466         i = sb.st_mode & S_IFMT;
 467         if (i != S_IFREG && i != S_IFLNK)
 468                 errx(4, "%s is not a valid file or link", specname);
 469         secsize = DEV_BSIZE;
 470         mediasize = sb.st_size;
 471 }
 472
 473 /*
 474  * Fetch disklabel for disk.
 475  */
 476 static int
 477 readlabel(int flag)
 478 {
 479         ssize_t nbytes;
 480         uint32_t lba;
 481         int f, i;
 482         int error;
 483
 484         f = open(specname, O_RDONLY);
 485         if (f < 0)
 486                 err(1, "%s", specname);
 487         if (is_file)
 488                 get_file_parms(f);
 489         else {
 490                 mediasize = g_mediasize(f);
 491                 secsize = g_sectorsize(f);
 492                 if (secsize < 0 || mediasize < 0)
 493                         err(4, "cannot get disk geometry");
 494         }
 495         if (mediasize > (off_t)0xffffffff * secsize)
 496                 errx(1,
 497                     "disks with more than 2^32-1 sectors are not supported");
 498         (void)lseek(f, (off_t)0, SEEK_SET);
 499         nbytes = read(f, bootarea, BBSIZE);
 500         if (nbytes == -1)
 501                 err(4, "%s read", specname);
 502         if (nbytes != BBSIZE)
 503                 errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
 504         close (f);
 505         error = bsd_disklabel_le_dec(
 506             bootarea + (labeloffset + labelsoffset * secsize),
 507             &lab, MAXPARTITIONS);
 508         if (flag && error)
 509                 errx(1, "%s: no valid label found", specname);
 510
 511         if (is_file)
 512                 return(0);
 513
 514         /*
 515          * Compensate for absolute block addressing by finding the
 516          * smallest partition offset and if the offset of the 'c'
 517          * partition is equal to that, subtract it from all offsets.
 518          */
 519         lba = ~0;
 520         for (i = 0; i < lab.d_npartitions; i++) {
 521                 if (lab.d_partitions[i].p_size)
 522                         lba = MIN(lba, lab.d_partitions[i].p_offset);
 523         }
 524         if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
 525                 for (i = 0; i < lab.d_npartitions; i++) {
 526                         if (lab.d_partitions[i].p_size)
 527                                 lab.d_partitions[i].p_offset -= lba;
 528                 }
 529                 /*
 530                  * Save the offset so that we can write the label
 531                  * back with absolute block addresses.
 532                  */
 533                 lba_offset = lba;
 534         }
 535         return (error);
 536 }
 537
 538
 539 static void
 540 display(FILE *f, const struct disklabel *lp)
 541 {
 542         int i, j;
 543         const struct partition *pp;
 544
 545         if (lp == NULL)
 546                 lp = &lab;
 547
 548         fprintf(f, "# %s:\n", specname);
 549         if (allfields) {
 550                 if (lp->d_type < DKMAXTYPES)
 551                         fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
 552                 else
 553                         fprintf(f, "type: %u\n", lp->d_type);
 554                 fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
 555                         lp->d_typename);
 556                 fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
 557                         lp->d_packname);
 558                 fprintf(f, "flags:");
 559                 if (lp->d_flags & D_REMOVABLE)
 560                         fprintf(f, " removeable");
 561                 if (lp->d_flags & D_ECC)
 562                         fprintf(f, " ecc");
 563                 if (lp->d_flags & D_BADSECT)
 564                         fprintf(f, " badsect");
 565                 fprintf(f, "\n");
 566                 fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
 567                 fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
 568                 fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
 569                 fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
 570                 fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
 571                 fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
 572                 fprintf(f, "rpm: %u\n", lp->d_rpm);
 573                 fprintf(f, "interleave: %u\n", lp->d_interleave);
 574                 fprintf(f, "trackskew: %u\n", lp->d_trackskew);
 575                 fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
 576                 fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
 577                     (u_long)lp->d_headswitch);
 578                 fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
 579                     (u_long)lp->d_trkseek);
 580                 fprintf(f, "drivedata: ");
 581                 for (i = NDDATA - 1; i >= 0; i--)
 582                         if (lp->d_drivedata[i])
 583                                 break;
 584                 if (i < 0)
 585                         i = 0;
 586                 for (j = 0; j <= i; j++)
 587                         fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
 588                 fprintf(f, "\n\n");
 589         }
 590         fprintf(f, "%u partitions:\n", lp->d_npartitions);
 591         fprintf(f,
 592             "#          size     offset    fstype   [fsize bsize bps/cpg]\n");
 593         pp = lp->d_partitions;
 594         for (i = 0; i < lp->d_npartitions; i++, pp++) {
 595                 if (pp->p_size) {
 596                         fprintf(f, "  %c: %10lu %10lu  ", 'a' + i,
 597                            (u_long)pp->p_size, (u_long)pp->p_offset);
 598                         if (pp->p_fstype < FSMAXTYPES)
 599                                 fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
 600                         else
 601                                 fprintf(f, "%8d", pp->p_fstype);
 602                         switch (pp->p_fstype) {
 603
 604                         case FS_UNUSED:                         /* XXX */
 605                                 fprintf(f, "    %5lu %5lu %2s",
 606                                     (u_long)pp->p_fsize,
 607                                     (u_long)(pp->p_fsize * pp->p_frag), "");
 608                                 break;
 609
 610                         case FS_BSDFFS:
 611                                 fprintf(f, "    %5lu %5lu %5u",
 612                                     (u_long)pp->p_fsize,
 613                                     (u_long)(pp->p_fsize * pp->p_frag),
 614                                     pp->p_cpg);
 615                                 break;
 616
 617                         case FS_BSDLFS:
 618                                 fprintf(f, "    %5lu %5lu %5d",
 619                                     (u_long)pp->p_fsize,
 620                                     (u_long)(pp->p_fsize * pp->p_frag),
 621                                     pp->p_cpg);
 622                                 break;
 623
 624                         default:
 625                                 fprintf(f, "%20.20s", "");
 626                                 break;
 627                         }
 628                         if (i == RAW_PART) {
 629                                 fprintf(f, "  # \"raw\" part, don't edit");
 630                         }
 631                         fprintf(f, "\n");
 632                 }
 633         }
 634         fflush(f);
 635 }
 636
 637 static int
 638 edit(void)
 639 {
 640         int c, fd;
 641         struct disklabel label;
 642         FILE *fp;
 643
 644         if ((fd = mkstemp(tmpfil)) == -1 ||
 645             (fp = fdopen(fd, "w")) == NULL) {
 646                 warnx("can't create %s", tmpfil);
 647                 return (1);
 648         }
 649         display(fp, NULL);
 650         fclose(fp);
 651         for (;;) {
 652                 if (!editit())
 653                         break;
 654                 fp = fopen(tmpfil, "r");
 655                 if (fp == NULL) {
 656                         warnx("can't reopen %s for reading", tmpfil);
 657                         break;
 658                 }
 659                 bzero((char *)&label, sizeof(label));
 660                 c = getasciilabel(fp, &label);
 661                 fclose(fp);
 662                 if (c) {
 663                         lab = label;
 664                         if (writelabel() == 0) {
 665                                 (void) unlink(tmpfil);
 666                                 return (0);
 667                         }
 668                 }
 669                 printf("re-edit the label? [y]: ");
 670                 fflush(stdout);
 671                 c = getchar();
 672                 if (c != EOF && c != (int)'\n')
 673                         while (getchar() != (int)'\n')
 674                                 ;
 675                 if  (c == (int)'n')
 676                         break;
 677         }
 678         (void) unlink(tmpfil);
 679         return (1);
 680 }
 681
 682 static int
 683 editit(void)
 684 {
 685         int pid, xpid;
 686         int locstat, omask;
 687         const char *ed;
 688         uid_t uid;
 689         gid_t gid;
 690
 691         omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 692         while ((pid = fork()) < 0) {
 693                 if (errno == EPROCLIM) {
 694                         warnx("you have too many processes");
 695                         return(0);
 696                 }
 697                 if (errno != EAGAIN) {
 698                         warn("fork");
 699                         return(0);
 700                 }
 701                 sleep(1);
 702         }
 703         if (pid == 0) {
 704                 sigsetmask(omask);
 705                 gid = getgid();
 706                 if (setresgid(gid, gid, gid) == -1)
 707                         err(1, "setresgid");
 708                 uid = getuid();
 709                 if (setresuid(uid, uid, uid) == -1)
 710                         err(1, "setresuid");
 711                 if ((ed = getenv("EDITOR")) == (char *)0)
 712                         ed = DEFEDITOR;
 713                 execlp(ed, ed, tmpfil, (char *)0);
 714                 err(1, "%s", ed);
 715         }
 716         while ((xpid = wait(&locstat)) >= 0)
 717                 if (xpid == pid)
 718                         break;
 719         sigsetmask(omask);
 720         return(!locstat);
 721 }
 722
 723 static char *
 724 skip(char *cp)
 725 {
 726
 727         while (*cp != '\0' && isspace(*cp))
 728                 cp++;
 729         if (*cp == '\0' || *cp == '#')
 730                 return (NULL);
 731         return (cp);
 732 }
 733
 734 static char *
 735 word(char *cp)
 736 {
 737         char c;
 738
 739         while (*cp != '\0' && !isspace(*cp) && *cp != '#')
 740                 cp++;
 741         if ((c = *cp) != '\0') {
 742                 *cp++ = '\0';
 743                 if (c != '#')
 744                         return (skip(cp));
 745         }
 746         return (NULL);
 747 }
 748
 749 /*
 750  * Read an ascii label in from fd f,
 751  * in the same format as that put out by display(),
 752  * and fill in lp.
 753  */
 754 static int
 755 getasciilabel(FILE *f, struct disklabel *lp)
 756 {
 757         char *cp, *endp;
 758         const char **cpp;
 759         u_int part;
 760         char *tp, line[BUFSIZ];
 761         u_long v;
 762         int lineno = 0, errors = 0;
 763         int i;
 764
 765         makelabel("auto", lp);
 766         bzero(&part_set, sizeof(part_set));
 767         bzero(&part_size_type, sizeof(part_size_type));
 768         bzero(&part_offset_type, sizeof(part_offset_type));
 769         lp->d_bbsize = BBSIZE;                          /* XXX */
 770         lp->d_sbsize = 0;                               /* XXX */
 771         while (fgets(line, sizeof(line) - 1, f)) {
 772                 lineno++;
 773                 if ((cp = index(line,'\n')) != 0)
 774                         *cp = '\0';
 775                 cp = skip(line);
 776                 if (cp == NULL)
 777                         continue;
 778                 tp = index(cp, ':');
 779                 if (tp == NULL) {
 780                         fprintf(stderr, "line %d: syntax error\n", lineno);
 781                         errors++;
 782                         continue;
 783                 }
 784                 *tp++ = '\0', tp = skip(tp);
 785                 if (!strcmp(cp, "type")) {
 786                         if (tp == NULL)
 787                                 tp = unknown;
 788                         cpp = dktypenames;
 789                         for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
 790                                 if (*cpp && !strcmp(*cpp, tp)) {
 791                                         lp->d_type = cpp - dktypenames;
 792                                         break;
 793                                 }
 794                         if (cpp < &dktypenames[DKMAXTYPES])
 795                                 continue;
 796                         errno = 0;
 797                         v = strtoul(tp, &endp, 10);
 798                         if (errno != 0 || *endp != '\0')
 799                                 v = DKMAXTYPES;
 800                         if (v >= DKMAXTYPES)
 801                                 fprintf(stderr, "line %d:%s %lu\n", lineno,
 802                                     "Warning, unknown disk type", v);
 803                         else
 804                                 lp->d_type = v;
 805                         continue;
 806                 }
 807                 if (!strcmp(cp, "flags")) {
 808                         for (v = 0; (cp = tp) && *cp != '\0';) {
 809                                 tp = word(cp);
 810                                 if (!strcmp(cp, "removeable"))
 811                                         v |= D_REMOVABLE;
 812                                 else if (!strcmp(cp, "ecc"))
 813                                         v |= D_ECC;
 814                                 else if (!strcmp(cp, "badsect"))
 815                                         v |= D_BADSECT;
 816                                 else {
 817                                         fprintf(stderr,
 818                                             "line %d: %s: bad flag\n",
 819                                             lineno, cp);
 820                                         errors++;
 821                                 }
 822                         }
 823                         lp->d_flags = v;
 824                         continue;
 825                 }
 826                 if (!strcmp(cp, "drivedata")) {
 827                         for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
 828                                 lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
 829                                 tp = word(cp);
 830                         }
 831                         continue;
 832                 }
 833                 if (sscanf(cp, "%lu partitions", &v) == 1) {
 834                         if (v == 0 || v > MAXPARTITIONS) {
 835                                 fprintf(stderr,
 836                                     "line %d: bad # of partitions\n", lineno);
 837                                 lp->d_npartitions = MAXPARTITIONS;
 838                                 errors++;
 839                         } else
 840                                 lp->d_npartitions = v;
 841                         continue;
 842                 }
 843                 if (tp == NULL)
 844                         tp = blank;
 845                 if (!strcmp(cp, "disk")) {
 846                         strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
 847                         continue;
 848                 }
 849                 if (!strcmp(cp, "label")) {
 850                         strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
 851                         continue;
 852                 }
 853                 if (!strcmp(cp, "bytes/sector")) {
 854                         v = strtoul(tp, NULL, 10);
 855                         if (v == 0 || (v % DEV_BSIZE) != 0) {
 856                                 fprintf(stderr,
 857                                     "line %d: %s: bad sector size\n",
 858                                     lineno, tp);
 859                                 errors++;
 860                         } else
 861                                 lp->d_secsize = v;
 862                         continue;
 863                 }
 864                 if (!strcmp(cp, "sectors/track")) {
 865                         v = strtoul(tp, NULL, 10);
 866 #if (ULONG_MAX != 0xffffffffUL)
 867                         if (v == 0 || v > 0xffffffff)
 868 #else
 869                         if (v == 0)
 870 #endif
 871                         {
 872                                 fprintf(stderr, "line %d: %s: bad %s\n",
 873                                     lineno, tp, cp);
 874                                 errors++;
 875                         } else
 876                                 lp->d_nsectors = v;
 877                         continue;
 878                 }
 879                 if (!strcmp(cp, "sectors/cylinder")) {
 880                         v = strtoul(tp, NULL, 10);
 881                         if (v == 0) {
 882                                 fprintf(stderr, "line %d: %s: bad %s\n",
 883                                     lineno, tp, cp);
 884                                 errors++;
 885                         } else
 886                                 lp->d_secpercyl = v;
 887                         continue;
 888                 }
 889                 if (!strcmp(cp, "tracks/cylinder")) {
 890                         v = strtoul(tp, NULL, 10);
 891                         if (v == 0) {
 892                                 fprintf(stderr, "line %d: %s: bad %s\n",
 893                                     lineno, tp, cp);
 894                                 errors++;
 895                         } else
 896                                 lp->d_ntracks = v;
 897                         continue;
 898                 }
 899                 if (!strcmp(cp, "cylinders")) {
 900                         v = strtoul(tp, NULL, 10);
 901                         if (v == 0) {
 902                                 fprintf(stderr, "line %d: %s: bad %s\n",
 903                                     lineno, tp, cp);
 904                                 errors++;
 905                         } else
 906                                 lp->d_ncylinders = v;
 907                         continue;
 908                 }
 909                 if (!strcmp(cp, "sectors/unit")) {
 910                         v = strtoul(tp, NULL, 10);
 911                         if (v == 0) {
 912                                 fprintf(stderr, "line %d: %s: bad %s\n",
 913                                     lineno, tp, cp);
 914                                 errors++;
 915                         } else
 916                                 lp->d_secperunit = v;
 917                         continue;
 918                 }
 919                 if (!strcmp(cp, "rpm")) {
 920                         v = strtoul(tp, NULL, 10);
 921                         if (v == 0 || v > USHRT_MAX) {
 922                                 fprintf(stderr, "line %d: %s: bad %s\n",
 923                                     lineno, tp, cp);
 924                                 errors++;
 925                         } else
 926                                 lp->d_rpm = v;
 927                         continue;
 928                 }
 929                 if (!strcmp(cp, "interleave")) {
 930                         v = strtoul(tp, NULL, 10);
 931                         if (v == 0 || v > USHRT_MAX) {
 932                                 fprintf(stderr, "line %d: %s: bad %s\n",
 933                                     lineno, tp, cp);
 934                                 errors++;
 935                         } else
 936                                 lp->d_interleave = v;
 937                         continue;
 938                 }
 939                 if (!strcmp(cp, "trackskew")) {
 940                         v = strtoul(tp, NULL, 10);
 941                         if (v > USHRT_MAX) {
 942                                 fprintf(stderr, "line %d: %s: bad %s\n",
 943                                     lineno, tp, cp);
 944                                 errors++;
 945                         } else
 946                                 lp->d_trackskew = v;
 947                         continue;
 948                 }
 949                 if (!strcmp(cp, "cylinderskew")) {
 950                         v = strtoul(tp, NULL, 10);
 951                         if (v > USHRT_MAX) {
 952                                 fprintf(stderr, "line %d: %s: bad %s\n",
 953                                     lineno, tp, cp);
 954                                 errors++;
 955                         } else
 956                                 lp->d_cylskew = v;
 957                         continue;
 958                 }
 959                 if (!strcmp(cp, "headswitch")) {
 960                         v = strtoul(tp, NULL, 10);
 961                         lp->d_headswitch = v;
 962                         continue;
 963                 }
 964                 if (!strcmp(cp, "track-to-track seek")) {
 965                         v = strtoul(tp, NULL, 10);
 966                         lp->d_trkseek = v;
 967                         continue;
 968                 }
 969                 /* the ':' was removed above */
 970                 if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
 971                         fprintf(stderr,
 972                             "line %d: %s: Unknown disklabel field\n", lineno,
 973                             cp);
 974                         errors++;
 975                         continue;
 976                 }
 977
 978                 /* Process a partition specification line. */
 979                 part = *cp - 'a';
 980                 if (part >= lp->d_npartitions) {
 981                         fprintf(stderr,
 982                             "line %d: partition name out of range a-%c: %s\n",
 983                             lineno, 'a' + lp->d_npartitions - 1, cp);
 984                         errors++;
 985                         continue;
 986                 }
 987                 part_set[part] = 1;
 988
 989                 if (getasciipartspec(tp, lp, part, lineno) != 0) {
 990                         errors++;
 991                         break;
 992                 }
 993         }
 994         errors += checklabel(lp);
 995         return (errors == 0);
 996 }
 997
 998 #define NXTNUM(n) do { \
 999         if (tp == NULL) { \
1000                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1001                 return (1); \
1002         } else { \
1003                 cp = tp, tp = word(cp); \
1004                 (n) = strtoul(cp, NULL, 10); \
1005         } \
1006 } while (0)
1007
1008 /* retain 1 character following number */
1009 #define NXTWORD(w,n) do { \
1010         if (tp == NULL) { \
1011                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1012                 return (1); \
1013         } else { \
1014                 char *tmp; \
1015                 cp = tp, tp = word(cp); \
1016                 (n) = strtoul(cp, &tmp, 10); \
1017                 if (tmp) (w) = *tmp; \
1018         } \
1019 } while (0)
1020
1021 /*
1022  * Read a partition line into partition `part' in the specified disklabel.
1023  * Return 0 on success, 1 on failure.
1024  */
1025 static int
1026 getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1027 {
1028         struct partition *pp;
1029         char *cp, *endp;
1030         const char **cpp;
1031         u_long v;
1032
1033         pp = &lp->d_partitions[part];
1034         cp = NULL;
1035
1036         v = 0;
1037         NXTWORD(part_size_type[part],v);
1038         if (v == 0 && part_size_type[part] != '*') {
1039                 fprintf(stderr,
1040                     "line %d: %s: bad partition size\n", lineno, cp);
1041                 return (1);
1042         }
1043         pp->p_size = v;
1044
1045         v = 0;
1046         NXTWORD(part_offset_type[part],v);
1047         if (v == 0 && part_offset_type[part] != '*' &&
1048             part_offset_type[part] != '\0') {
1049                 fprintf(stderr,
1050                     "line %d: %s: bad partition offset\n", lineno, cp);
1051                 return (1);
1052         }
1053         pp->p_offset = v;
1054         if (tp == NULL) {
1055                 fprintf(stderr, "line %d: missing file system type\n", lineno);
1056                 return (1);
1057         }
1058         cp = tp, tp = word(cp);
1059         for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1060                 if (*cpp && !strcmp(*cpp, cp))
1061                         break;
1062         if (*cpp != NULL) {
1063                 pp->p_fstype = cpp - fstypenames;
1064         } else {
1065                 if (isdigit(*cp)) {
1066                         errno = 0;
1067                         v = strtoul(cp, &endp, 10);
1068                         if (errno != 0 || *endp != '\0')
1069                                 v = FSMAXTYPES;
1070                 } else
1071                         v = FSMAXTYPES;
1072                 if (v >= FSMAXTYPES) {
1073                         fprintf(stderr,
1074                             "line %d: Warning, unknown file system type %s\n",
1075                             lineno, cp);
1076                         v = FS_UNUSED;
1077                 }
1078                 pp->p_fstype = v;
1079         }
1080
1081         switch (pp->p_fstype) {
1082         case FS_UNUSED:
1083         case FS_BSDFFS:
1084         case FS_BSDLFS:
1085                 /* accept defaults for fsize/frag/cpg */
1086                 if (tp) {
1087                         NXTNUM(pp->p_fsize);
1088                         if (pp->p_fsize == 0)
1089                                 break;
1090                         NXTNUM(v);
1091                         pp->p_frag = v / pp->p_fsize;
1092                         if (tp != NULL)
1093                                 NXTNUM(pp->p_cpg);
1094                 }
1095                 /* else default to 0's */
1096                 break;
1097         default:
1098                 break;
1099         }
1100         return (0);
1101 }
1102
1103 /*
1104  * Check disklabel for errors and fill in
1105  * derived fields according to supplied values.
1106  */
1107 static int
1108 checklabel(struct disklabel *lp)
1109 {
1110         struct partition *pp;
1111         int i, errors = 0;
1112         char part;
1113         u_long base_offset, needed, total_size, total_percent, current_offset;
1114         long free_space;
1115         int seen_default_offset;
1116         int hog_part;
1117         int j;
1118         struct partition *pp2;
1119
1120         if (lp == NULL)
1121                 lp = &lab;
1122
1123         if (allfields) {
1124
1125                 if (lp->d_secsize == 0) {
1126                         fprintf(stderr, "sector size 0\n");
1127                         return (1);
1128                 }
1129                 if (lp->d_nsectors == 0) {
1130                         fprintf(stderr, "sectors/track 0\n");
1131                         return (1);
1132                 }
1133                 if (lp->d_ntracks == 0) {
1134                         fprintf(stderr, "tracks/cylinder 0\n");
1135                         return (1);
1136                 }
1137                 if  (lp->d_ncylinders == 0) {
1138                         fprintf(stderr, "cylinders/unit 0\n");
1139                         errors++;
1140                 }
1141                 if (lp->d_rpm == 0)
1142                         warnx("revolutions/minute 0");
1143                 if (lp->d_secpercyl == 0)
1144                         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1145                 if (lp->d_secperunit == 0)
1146                         lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1147                 if (lp->d_bbsize == 0) {
1148                         fprintf(stderr, "boot block size 0\n");
1149                         errors++;
1150                 } else if (lp->d_bbsize % lp->d_secsize)
1151                         warnx("boot block size %% sector-size != 0");
1152                 if (lp->d_npartitions > MAXPARTITIONS)
1153                         warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1154                             (u_long)lp->d_npartitions, MAXPARTITIONS);
1155         } else {
1156                 struct disklabel *vl;
1157
1158                 vl = getvirginlabel();
1159                 lp->d_secsize = vl->d_secsize;
1160                 lp->d_nsectors = vl->d_nsectors;
1161                 lp->d_ntracks = vl->d_ntracks;
1162                 lp->d_ncylinders = vl->d_ncylinders;
1163                 lp->d_rpm = vl->d_rpm;
1164                 lp->d_interleave = vl->d_interleave;
1165                 lp->d_secpercyl = vl->d_secpercyl;
1166                 lp->d_secperunit = vl->d_secperunit;
1167                 lp->d_bbsize = vl->d_bbsize;
1168                 lp->d_npartitions = vl->d_npartitions;
1169         }
1170
1171
1172         /* first allocate space to the partitions, then offsets */
1173         total_size = 0; /* in sectors */
1174         total_percent = 0; /* in percent */
1175         hog_part = -1;
1176         /* find all fixed partitions */
1177         for (i = 0; i < lp->d_npartitions; i++) {
1178                 pp = &lp->d_partitions[i];
1179                 if (part_set[i]) {
1180                         if (part_size_type[i] == '*') {
1181                                 if (i == RAW_PART) {
1182                                         pp->p_size = lp->d_secperunit;
1183                                 } else {
1184                                         if (hog_part != -1)
1185                                                 warnx("Too many '*' partitions (%c and %c)",
1186                                                     hog_part + 'a',i + 'a');
1187                                         else
1188                                                 hog_part = i;
1189                                 }
1190                         } else {
1191                                 off_t size;
1192
1193                                 size = pp->p_size;
1194                                 switch (part_size_type[i]) {
1195                                 case '%':
1196                                         total_percent += size;
1197                                         break;
1198                                 case 't':
1199                                 case 'T':
1200                                         size *= 1024ULL;
1201                                         /* FALLTHROUGH */
1202                                 case 'g':
1203                                 case 'G':
1204                                         size *= 1024ULL;
1205                                         /* FALLTHROUGH */
1206                                 case 'm':
1207                                 case 'M':
1208                                         size *= 1024ULL;
1209                                         /* FALLTHROUGH */
1210                                 case 'k':
1211                                 case 'K':
1212                                         size *= 1024ULL;
1213                                         break;
1214                                 case '\0':
1215                                         break;
1216                                 default:
1217                                         warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1218                                             part_size_type[i], i + 'a');
1219                                         break;
1220                                 }
1221                                 /* don't count %'s yet */
1222                                 if (part_size_type[i] != '%') {
1223                                         /*
1224                                          * for all not in sectors, convert to
1225                                          * sectors
1226                                          */
1227                                         if (part_size_type[i] != '\0') {
1228                                                 if (size % lp->d_secsize != 0)
1229                                                         warnx("partition %c not an integer number of sectors",
1230                                                             i + 'a');
1231                                                 size /= lp->d_secsize;
1232                                                 pp->p_size = size;
1233                                         }
1234                                         /* else already in sectors */
1235                                         if (i != RAW_PART)
1236                                                 total_size += size;
1237                                 }
1238                         }
1239                 }
1240         }
1241
1242         /* Find out the total free space, excluding the boot block area. */
1243         base_offset = BBSIZE / secsize;
1244         free_space = 0;
1245         for (i = 0; i < lp->d_npartitions; i++) {
1246                 pp = &lp->d_partitions[i];
1247                 if (!part_set[i] || i == RAW_PART ||
1248                     part_size_type[i] == '%' || part_size_type[i] == '*')
1249                         continue;
1250                 if (pp->p_offset > base_offset)
1251                         free_space += pp->p_offset - base_offset;
1252                 if (pp->p_offset + pp->p_size > base_offset)
1253                         base_offset = pp->p_offset + pp->p_size;
1254         }
1255         if (base_offset < lp->d_secperunit)
1256                 free_space += lp->d_secperunit - base_offset;
1257
1258         /* handle % partitions - note %'s don't need to add up to 100! */
1259         if (total_percent != 0) {
1260                 if (total_percent > 100) {
1261                         fprintf(stderr,"total percentage %lu is greater than 100\n",
1262                             total_percent);
1263                         errors++;
1264                 }
1265
1266                 if (free_space > 0) {
1267                         for (i = 0; i < lp->d_npartitions; i++) {
1268                                 pp = &lp->d_partitions[i];
1269                                 if (part_set[i] && part_size_type[i] == '%') {
1270                                         /* careful of overflows! and integer roundoff */
1271                                         pp->p_size = ((double)pp->p_size/100) * free_space;
1272                                         total_size += pp->p_size;
1273
1274                                         /* FIX we can lose a sector or so due to roundoff per
1275                                            partition.  A more complex algorithm could avoid that */
1276                                 }
1277                         }
1278                 } else {
1279                         fprintf(stderr,
1280                             "%ld sectors available to give to '*' and '%%' partitions\n",
1281                             free_space);
1282                         errors++;
1283                         /* fix?  set all % partitions to size 0? */
1284                 }
1285         }
1286         /* give anything remaining to the hog partition */
1287         if (hog_part != -1) {
1288                 /*
1289                  * Find the range of offsets usable by '*' partitions around
1290                  * the hog partition and how much space they need.
1291                  */
1292                 needed = 0;
1293                 base_offset = BBSIZE / secsize;
1294                 for (i = hog_part - 1; i >= 0; i--) {
1295                         pp = &lp->d_partitions[i];
1296                         if (!part_set[i] || i == RAW_PART)
1297                                 continue;
1298                         if (part_offset_type[i] == '*') {
1299                                 needed += pp->p_size;
1300                                 continue;
1301                         }
1302                         base_offset = pp->p_offset + pp->p_size;
1303                         break;
1304                 }
1305                 current_offset = lp->d_secperunit;
1306                 for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1307                         pp = &lp->d_partitions[i];
1308                         if (!part_set[i] || i == RAW_PART)
1309                                 continue;
1310                         if (part_offset_type[i] == '*') {
1311                                 needed += pp->p_size;
1312                                 continue;
1313                         }
1314                         current_offset = pp->p_offset;
1315                 }
1316
1317                 if (current_offset - base_offset <= needed) {
1318                         fprintf(stderr, "Cannot find space for partition %c\n",
1319                             hog_part + 'a');
1320                         fprintf(stderr,
1321                             "Need more than %lu sectors between %lu and %lu\n",
1322                             needed, base_offset, current_offset);
1323                         errors++;
1324                         lp->d_partitions[hog_part].p_size = 0;
1325                 } else {
1326                         lp->d_partitions[hog_part].p_size = current_offset -
1327                             base_offset - needed;
1328                         total_size += lp->d_partitions[hog_part].p_size;
1329                 }
1330         }
1331
1332         /* Now set the offsets for each partition */
1333         current_offset = BBSIZE / secsize; /* in sectors */
1334         seen_default_offset = 0;
1335         for (i = 0; i < lp->d_npartitions; i++) {
1336                 part = 'a' + i;
1337                 pp = &lp->d_partitions[i];
1338                 if (part_set[i]) {
1339                         if (part_offset_type[i] == '*') {
1340                                 if (i == RAW_PART) {
1341                                         pp->p_offset = 0;
1342                                 } else {
1343                                         pp->p_offset = current_offset;
1344                                         seen_default_offset = 1;
1345                                 }
1346                         } else {
1347                                 /* allow them to be out of order for old-style tables */
1348                                 if (pp->p_offset < current_offset &&
1349                                     seen_default_offset && i != RAW_PART &&
1350                                     pp->p_fstype != FS_VINUM) {
1351                                         fprintf(stderr,
1352 "Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1353                                             (long)pp->p_offset,i+'a',current_offset);
1354                                         fprintf(stderr,
1355 "Labels with any *'s for offset must be in ascending order by sector\n");
1356                                         errors++;
1357                                 } else if (pp->p_offset != current_offset &&
1358                                     i != RAW_PART && seen_default_offset) {
1359                                         /*
1360                                          * this may give unneeded warnings if
1361                                          * partitions are out-of-order
1362                                          */
1363                                         warnx(
1364 "Offset %ld for partition %c doesn't match expected value %ld",
1365                                             (long)pp->p_offset, i + 'a', current_offset);
1366                                 }
1367                         }
1368                         if (i != RAW_PART)
1369                                 current_offset = pp->p_offset + pp->p_size;
1370                 }
1371         }
1372
1373         for (i = 0; i < lp->d_npartitions; i++) {
1374                 part = 'a' + i;
1375                 pp = &lp->d_partitions[i];
1376                 if (pp->p_size == 0 && pp->p_offset != 0)
1377                         warnx("partition %c: size 0, but offset %lu",
1378                             part, (u_long)pp->p_offset);
1379 #ifdef notdef
1380                 if (pp->p_size % lp->d_secpercyl)
1381                         warnx("partition %c: size %% cylinder-size != 0",
1382                             part);
1383                 if (pp->p_offset % lp->d_secpercyl)
1384                         warnx("partition %c: offset %% cylinder-size != 0",
1385                             part);
1386 #endif
1387                 if (pp->p_offset > lp->d_secperunit) {
1388                         fprintf(stderr,
1389                             "partition %c: offset past end of unit\n", part);
1390                         errors++;
1391                 }
1392                 if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1393                         fprintf(stderr,
1394                         "partition %c: partition extends past end of unit\n",
1395                             part);
1396                         errors++;
1397                 }
1398                 if (i == RAW_PART) {
1399                         if (pp->p_fstype != FS_UNUSED)
1400                                 warnx("partition %c is not marked as unused!",part);
1401                         if (pp->p_offset != 0)
1402                                 warnx("partition %c doesn't start at 0!",part);
1403                         if (pp->p_size != lp->d_secperunit)
1404                                 warnx("partition %c doesn't cover the whole unit!",part);
1405
1406                         if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1407                             (pp->p_size != lp->d_secperunit)) {
1408                                 warnx("An incorrect partition %c may cause problems for "
1409                                     "standard system utilities",part);
1410                         }
1411                 }
1412
1413                 /* check for overlaps */
1414                 /* this will check for all possible overlaps once and only once */
1415                 for (j = 0; j < i; j++) {
1416                         pp2 = &lp->d_partitions[j];
1417                         if (j != RAW_PART && i != RAW_PART &&
1418                             pp->p_fstype != FS_VINUM &&
1419                             pp2->p_fstype != FS_VINUM &&
1420                             part_set[i] && part_set[j]) {
1421                                 if (pp2->p_offset < pp->p_offset + pp->p_size &&
1422                                     (pp2->p_offset + pp2->p_size > pp->p_offset ||
1423                                         pp2->p_offset >= pp->p_offset)) {
1424                                         fprintf(stderr,"partitions %c and %c overlap!\n",
1425                                             j + 'a', i + 'a');
1426                                         errors++;
1427                                 }
1428                         }
1429                 }
1430         }
1431         for (; i < lp->d_npartitions; i++) {
1432                 part = 'a' + i;
1433                 pp = &lp->d_partitions[i];
1434                 if (pp->p_size || pp->p_offset)
1435                         warnx("unused partition %c: size %d offset %lu",
1436                             'a' + i, pp->p_size, (u_long)pp->p_offset);
1437         }
1438         return (errors);
1439 }
1440
1441 /*
1442  * When operating on a "virgin" disk, try getting an initial label
1443  * from the associated device driver.  This might work for all device
1444  * drivers that are able to fetch some initial device parameters
1445  * without even having access to a (BSD) disklabel, like SCSI disks,
1446  * most IDE drives, or vn devices.
1447  *
1448  * The device name must be given in its "canonical" form.
1449  */
1450 static struct disklabel *
1451 getvirginlabel(void)
1452 {
1453         static struct disklabel loclab;
1454         struct partition *dp;
1455         int f;
1456         u_int u;
1457
1458         if ((f = open(specname, O_RDONLY)) == -1) {
1459                 warn("cannot open %s", specname);
1460                 return (NULL);
1461         }
1462
1463         if (is_file)
1464                 get_file_parms(f);
1465         else {
1466                 mediasize = g_mediasize(f);
1467                 secsize = g_sectorsize(f);
1468                 if (secsize < 0 || mediasize < 0) {
1469                         close (f);
1470                         return (NULL);
1471                 }
1472         }
1473         memset(&loclab, 0, sizeof loclab);
1474         loclab.d_magic = DISKMAGIC;
1475         loclab.d_magic2 = DISKMAGIC;
1476         loclab.d_secsize = secsize;
1477         loclab.d_secperunit = mediasize / secsize;
1478
1479         /*
1480          * Nobody in these enligthened days uses the CHS geometry for
1481          * anything, but nontheless try to get it right.  If we fail
1482          * to get any good ideas from the device, construct something
1483          * which is IBM-PC friendly.
1484          */
1485         if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1486                 loclab.d_nsectors = u;
1487         else
1488                 loclab.d_nsectors = 63;
1489         if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1490                 loclab.d_ntracks = u;
1491         else if (loclab.d_secperunit <= 63*1*1024)
1492                 loclab.d_ntracks = 1;
1493         else if (loclab.d_secperunit <= 63*16*1024)
1494                 loclab.d_ntracks = 16;
1495         else
1496                 loclab.d_ntracks = 255;
1497         loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1498         loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1499         loclab.d_npartitions = DEFPARTITIONS;
1500
1501         /* Various (unneeded) compat stuff */
1502         loclab.d_rpm = 3600;
1503         loclab.d_bbsize = BBSIZE;
1504         loclab.d_interleave = 1;
1505         strncpy(loclab.d_typename, "amnesiac",
1506             sizeof(loclab.d_typename));
1507
1508         dp = &loclab.d_partitions[RAW_PART];
1509         dp->p_size = loclab.d_secperunit;
1510         loclab.d_checksum = dkcksum(&loclab);
1511         close (f);
1512         return (&loclab);
1513 }
1514
1515 static void
1516 usage(void)
1517 {
1518
1519         fprintf(stderr,
1520         "%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n%s\n",
1521         "usage: bsdlabel disk",
1522         "\t\t(to read label)",
1523         "       bsdlabel -w [-n] [-m machine] disk [type]",
1524         "\t\t(to write label with existing boot program)",
1525         "       bsdlabel -e [-n] [-m machine] disk",
1526         "\t\t(to edit label)",
1527         "       bsdlabel -R [-n] [-m machine] disk protofile",
1528         "\t\t(to restore label with existing boot program)",
1529         "       bsdlabel -B [-b boot] [-m machine] disk",
1530         "\t\t(to install boot program with existing on-disk label)",
1531         "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1532         "\t\t(to write label and install boot program)",
1533         "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1534                 "\t\t(to restore label and install boot program)"
1535         );
1536         exit(1);
1537 }