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   20
  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_class_available(const char *);
  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 static 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 ignore -r for compatibility with
 193                                  * historical 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_class_available(const char *name)
 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, name) == 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 suppressed - 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 * lab.d_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                 if (geom_class_available("PART") != 0) {
 415                         /*
 416                          * Since we weren't able open provider for
 417                          * writing, then recommend user to use gpart(8).
 418                          */
 419                         warnc(serrno,
 420                             "cannot open provider %s for writing label",
 421                             specname);
 422                         warnx("Try to use gpart(8).");
 423                         return (1);
 424                 }
 425
 426                 /* Give up if GEOM_BSD is not available. */
 427                 if (geom_class_available("BSD") == 0) {
 428                         warnc(serrno, "%s", specname);
 429                         return (1);
 430                 }
 431
 432                 grq = gctl_get_handle();
 433                 gctl_ro_param(grq, "verb", -1, "write label");
 434                 gctl_ro_param(grq, "class", -1, "BSD");
 435                 gctl_ro_param(grq, "geom", -1, pname);
 436                 gctl_ro_param(grq, "label", 148+16*8,
 437                         bootarea + labeloffset + labelsoffset * lab.d_secsize);
 438                 errstr = gctl_issue(grq);
 439                 if (errstr != NULL) {
 440                         warnx("%s", errstr);
 441                         gctl_free(grq);
 442                         return(1);
 443                 }
 444                 gctl_free(grq);
 445                 if (installboot) {
 446                         grq = gctl_get_handle();
 447                         gctl_ro_param(grq, "verb", -1, "write bootcode");
 448                         gctl_ro_param(grq, "class", -1, "BSD");
 449                         gctl_ro_param(grq, "geom", -1, pname);
 450                         gctl_ro_param(grq, "bootcode", BBSIZE, bootarea);
 451                         errstr = gctl_issue(grq);
 452                         if (errstr != NULL) {
 453                                 warnx("%s", errstr);
 454                                 gctl_free(grq);
 455                                 return (1);
 456                         }
 457                         gctl_free(grq);
 458                 }
 459         } else {
 460                 if (write(fd, bootarea, bbsize) != bbsize) {
 461                         warn("write %s", specname);
 462                         close (fd);
 463                         return (1);
 464                 }
 465                 close (fd);
 466         }
 467         return (0);
 468 }
 469
 470 static void
 471 get_file_parms(int f)
 472 {
 473         int i;
 474         struct stat sb;
 475
 476         if (fstat(f, &sb) != 0)
 477                 err(4, "fstat failed");
 478         i = sb.st_mode & S_IFMT;
 479         if (i != S_IFREG && i != S_IFLNK)
 480                 errx(4, "%s is not a valid file or link", specname);
 481         secsize = DEV_BSIZE;
 482         mediasize = sb.st_size;
 483 }
 484
 485 /*
 486  * Fetch disklabel for disk.
 487  */
 488 static int
 489 readlabel(int flag)
 490 {
 491         ssize_t nbytes;
 492         uint32_t lba;
 493         int f, i;
 494         int error;
 495
 496         f = open(specname, O_RDONLY);
 497         if (f < 0)
 498                 err(1, "%s", specname);
 499         if (is_file)
 500                 get_file_parms(f);
 501         else {
 502                 mediasize = g_mediasize(f);
 503                 secsize = g_sectorsize(f);
 504                 if (secsize < 0 || mediasize < 0)
 505                         err(4, "cannot get disk geometry");
 506         }
 507         if (mediasize > (off_t)0xffffffff * secsize)
 508                 errx(1,
 509                     "disks with more than 2^32-1 sectors are not supported");
 510         (void)lseek(f, (off_t)0, SEEK_SET);
 511         nbytes = read(f, bootarea, BBSIZE);
 512         if (nbytes == -1)
 513                 err(4, "%s read", specname);
 514         if (nbytes != BBSIZE)
 515                 errx(4, "couldn't read %d bytes from %s", BBSIZE, specname);
 516         close (f);
 517         error = bsd_disklabel_le_dec(
 518             bootarea + (labeloffset + labelsoffset * secsize),
 519             &lab, MAXPARTITIONS);
 520         if (flag && error)
 521                 errx(1, "%s: no valid label found", specname);
 522
 523         if (is_file)
 524                 return(0);
 525
 526         /*
 527          * Compensate for absolute block addressing by finding the
 528          * smallest partition offset and if the offset of the 'c'
 529          * partition is equal to that, subtract it from all offsets.
 530          */
 531         lba = ~0;
 532         for (i = 0; i < lab.d_npartitions; i++) {
 533                 if (lab.d_partitions[i].p_size)
 534                         lba = MIN(lba, lab.d_partitions[i].p_offset);
 535         }
 536         if (lba != 0 && lab.d_partitions[RAW_PART].p_offset == lba) {
 537                 for (i = 0; i < lab.d_npartitions; i++) {
 538                         if (lab.d_partitions[i].p_size)
 539                                 lab.d_partitions[i].p_offset -= lba;
 540                 }
 541                 /*
 542                  * Save the offset so that we can write the label
 543                  * back with absolute block addresses.
 544                  */
 545                 lba_offset = lba;
 546         }
 547         return (error);
 548 }
 549
 550
 551 static void
 552 display(FILE *f, const struct disklabel *lp)
 553 {
 554         int i, j;
 555         const struct partition *pp;
 556
 557         if (lp == NULL)
 558                 lp = &lab;
 559
 560         fprintf(f, "# %s:\n", specname);
 561         if (allfields) {
 562                 if (lp->d_type < DKMAXTYPES)
 563                         fprintf(f, "type: %s\n", dktypenames[lp->d_type]);
 564                 else
 565                         fprintf(f, "type: %u\n", lp->d_type);
 566                 fprintf(f, "disk: %.*s\n", (int)sizeof(lp->d_typename),
 567                         lp->d_typename);
 568                 fprintf(f, "label: %.*s\n", (int)sizeof(lp->d_packname),
 569                         lp->d_packname);
 570                 fprintf(f, "flags:");
 571                 if (lp->d_flags & D_REMOVABLE)
 572                         fprintf(f, " removeable");
 573                 if (lp->d_flags & D_ECC)
 574                         fprintf(f, " ecc");
 575                 if (lp->d_flags & D_BADSECT)
 576                         fprintf(f, " badsect");
 577                 fprintf(f, "\n");
 578                 fprintf(f, "bytes/sector: %lu\n", (u_long)lp->d_secsize);
 579                 fprintf(f, "sectors/track: %lu\n", (u_long)lp->d_nsectors);
 580                 fprintf(f, "tracks/cylinder: %lu\n", (u_long)lp->d_ntracks);
 581                 fprintf(f, "sectors/cylinder: %lu\n", (u_long)lp->d_secpercyl);
 582                 fprintf(f, "cylinders: %lu\n", (u_long)lp->d_ncylinders);
 583                 fprintf(f, "sectors/unit: %lu\n", (u_long)lp->d_secperunit);
 584                 fprintf(f, "rpm: %u\n", lp->d_rpm);
 585                 fprintf(f, "interleave: %u\n", lp->d_interleave);
 586                 fprintf(f, "trackskew: %u\n", lp->d_trackskew);
 587                 fprintf(f, "cylinderskew: %u\n", lp->d_cylskew);
 588                 fprintf(f, "headswitch: %lu\t\t# milliseconds\n",
 589                     (u_long)lp->d_headswitch);
 590                 fprintf(f, "track-to-track seek: %ld\t# milliseconds\n",
 591                     (u_long)lp->d_trkseek);
 592                 fprintf(f, "drivedata: ");
 593                 for (i = NDDATA - 1; i >= 0; i--)
 594                         if (lp->d_drivedata[i])
 595                                 break;
 596                 if (i < 0)
 597                         i = 0;
 598                 for (j = 0; j <= i; j++)
 599                         fprintf(f, "%lu ", (u_long)lp->d_drivedata[j]);
 600                 fprintf(f, "\n\n");
 601         }
 602         fprintf(f, "%u partitions:\n", lp->d_npartitions);
 603         fprintf(f,
 604             "#          size     offset    fstype   [fsize bsize bps/cpg]\n");
 605         pp = lp->d_partitions;
 606         for (i = 0; i < lp->d_npartitions; i++, pp++) {
 607                 if (pp->p_size) {
 608                         fprintf(f, "  %c: %10lu %10lu  ", 'a' + i,
 609                            (u_long)pp->p_size, (u_long)pp->p_offset);
 610                         if (pp->p_fstype < FSMAXTYPES)
 611                                 fprintf(f, "%8.8s", fstypenames[pp->p_fstype]);
 612                         else
 613                                 fprintf(f, "%8d", pp->p_fstype);
 614                         switch (pp->p_fstype) {
 615
 616                         case FS_UNUSED:                         /* XXX */
 617                                 fprintf(f, "    %5lu %5lu %2s",
 618                                     (u_long)pp->p_fsize,
 619                                     (u_long)(pp->p_fsize * pp->p_frag), "");
 620                                 break;
 621
 622                         case FS_BSDFFS:
 623                                 fprintf(f, "    %5lu %5lu %5u",
 624                                     (u_long)pp->p_fsize,
 625                                     (u_long)(pp->p_fsize * pp->p_frag),
 626                                     pp->p_cpg);
 627                                 break;
 628
 629                         case FS_BSDLFS:
 630                                 fprintf(f, "    %5lu %5lu %5d",
 631                                     (u_long)pp->p_fsize,
 632                                     (u_long)(pp->p_fsize * pp->p_frag),
 633                                     pp->p_cpg);
 634                                 break;
 635
 636                         default:
 637                                 fprintf(f, "%20.20s", "");
 638                                 break;
 639                         }
 640                         if (i == RAW_PART) {
 641                                 fprintf(f, "  # \"raw\" part, don't edit");
 642                         }
 643                         fprintf(f, "\n");
 644                 }
 645         }
 646         fflush(f);
 647 }
 648
 649 static int
 650 edit(void)
 651 {
 652         int c, fd;
 653         struct disklabel label;
 654         FILE *fp;
 655
 656         if ((fd = mkstemp(tmpfil)) == -1 ||
 657             (fp = fdopen(fd, "w")) == NULL) {
 658                 warnx("can't create %s", tmpfil);
 659                 return (1);
 660         }
 661         display(fp, NULL);
 662         fclose(fp);
 663         for (;;) {
 664                 if (!editit())
 665                         break;
 666                 fp = fopen(tmpfil, "r");
 667                 if (fp == NULL) {
 668                         warnx("can't reopen %s for reading", tmpfil);
 669                         break;
 670                 }
 671                 bzero((char *)&label, sizeof(label));
 672                 c = getasciilabel(fp, &label);
 673                 fclose(fp);
 674                 if (c) {
 675                         lab = label;
 676                         if (writelabel() == 0) {
 677                                 (void) unlink(tmpfil);
 678                                 return (0);
 679                         }
 680                 }
 681                 printf("re-edit the label? [y]: ");
 682                 fflush(stdout);
 683                 c = getchar();
 684                 if (c != EOF && c != (int)'\n')
 685                         while (getchar() != (int)'\n')
 686                                 ;
 687                 if  (c == (int)'n')
 688                         break;
 689         }
 690         (void) unlink(tmpfil);
 691         return (1);
 692 }
 693
 694 static int
 695 editit(void)
 696 {
 697         int pid, xpid;
 698         int locstat, omask;
 699         const char *ed;
 700         uid_t uid;
 701         gid_t gid;
 702
 703         omask = sigblock(sigmask(SIGINT)|sigmask(SIGQUIT)|sigmask(SIGHUP));
 704         while ((pid = fork()) < 0) {
 705                 if (errno == EPROCLIM) {
 706                         warnx("you have too many processes");
 707                         return(0);
 708                 }
 709                 if (errno != EAGAIN) {
 710                         warn("fork");
 711                         return(0);
 712                 }
 713                 sleep(1);
 714         }
 715         if (pid == 0) {
 716                 sigsetmask(omask);
 717                 gid = getgid();
 718                 if (setresgid(gid, gid, gid) == -1)
 719                         err(1, "setresgid");
 720                 uid = getuid();
 721                 if (setresuid(uid, uid, uid) == -1)
 722                         err(1, "setresuid");
 723                 if ((ed = getenv("EDITOR")) == (char *)0)
 724                         ed = DEFEDITOR;
 725                 execlp(ed, ed, tmpfil, (char *)0);
 726                 err(1, "%s", ed);
 727         }
 728         while ((xpid = wait(&locstat)) >= 0)
 729                 if (xpid == pid)
 730                         break;
 731         sigsetmask(omask);
 732         return(!locstat);
 733 }
 734
 735 static char *
 736 skip(char *cp)
 737 {
 738
 739         while (*cp != '\0' && isspace(*cp))
 740                 cp++;
 741         if (*cp == '\0' || *cp == '#')
 742                 return (NULL);
 743         return (cp);
 744 }
 745
 746 static char *
 747 word(char *cp)
 748 {
 749         char c;
 750
 751         while (*cp != '\0' && !isspace(*cp) && *cp != '#')
 752                 cp++;
 753         if ((c = *cp) != '\0') {
 754                 *cp++ = '\0';
 755                 if (c != '#')
 756                         return (skip(cp));
 757         }
 758         return (NULL);
 759 }
 760
 761 /*
 762  * Read an ascii label in from fd f,
 763  * in the same format as that put out by display(),
 764  * and fill in lp.
 765  */
 766 static int
 767 getasciilabel(FILE *f, struct disklabel *lp)
 768 {
 769         char *cp, *endp;
 770         const char **cpp;
 771         u_int part;
 772         char *tp, line[BUFSIZ];
 773         u_long v;
 774         int lineno = 0, errors = 0;
 775         int i;
 776
 777         makelabel("auto", lp);
 778         bzero(&part_set, sizeof(part_set));
 779         bzero(&part_size_type, sizeof(part_size_type));
 780         bzero(&part_offset_type, sizeof(part_offset_type));
 781         lp->d_bbsize = BBSIZE;                          /* XXX */
 782         lp->d_sbsize = 0;                               /* XXX */
 783         while (fgets(line, sizeof(line) - 1, f)) {
 784                 lineno++;
 785                 if ((cp = strchr(line,'\n')) != 0)
 786                         *cp = '\0';
 787                 cp = skip(line);
 788                 if (cp == NULL)
 789                         continue;
 790                 tp = strchr(cp, ':');
 791                 if (tp == NULL) {
 792                         fprintf(stderr, "line %d: syntax error\n", lineno);
 793                         errors++;
 794                         continue;
 795                 }
 796                 *tp++ = '\0', tp = skip(tp);
 797                 if (!strcmp(cp, "type")) {
 798                         if (tp == NULL)
 799                                 tp = unknown;
 800                         cpp = dktypenames;
 801                         for (; cpp < &dktypenames[DKMAXTYPES]; cpp++)
 802                                 if (*cpp && !strcmp(*cpp, tp)) {
 803                                         lp->d_type = cpp - dktypenames;
 804                                         break;
 805                                 }
 806                         if (cpp < &dktypenames[DKMAXTYPES])
 807                                 continue;
 808                         errno = 0;
 809                         v = strtoul(tp, &endp, 10);
 810                         if (errno != 0 || *endp != '\0')
 811                                 v = DKMAXTYPES;
 812                         if (v >= DKMAXTYPES)
 813                                 fprintf(stderr, "line %d:%s %lu\n", lineno,
 814                                     "Warning, unknown disk type", v);
 815                         else
 816                                 lp->d_type = v;
 817                         continue;
 818                 }
 819                 if (!strcmp(cp, "flags")) {
 820                         for (v = 0; (cp = tp) && *cp != '\0';) {
 821                                 tp = word(cp);
 822                                 if (!strcmp(cp, "removeable"))
 823                                         v |= D_REMOVABLE;
 824                                 else if (!strcmp(cp, "ecc"))
 825                                         v |= D_ECC;
 826                                 else if (!strcmp(cp, "badsect"))
 827                                         v |= D_BADSECT;
 828                                 else {
 829                                         fprintf(stderr,
 830                                             "line %d: %s: bad flag\n",
 831                                             lineno, cp);
 832                                         errors++;
 833                                 }
 834                         }
 835                         lp->d_flags = v;
 836                         continue;
 837                 }
 838                 if (!strcmp(cp, "drivedata")) {
 839                         for (i = 0; (cp = tp) && *cp != '\0' && i < NDDATA;) {
 840                                 lp->d_drivedata[i++] = strtoul(cp, NULL, 10);
 841                                 tp = word(cp);
 842                         }
 843                         continue;
 844                 }
 845                 if (sscanf(cp, "%lu partitions", &v) == 1) {
 846                         if (v > MAXPARTITIONS) {
 847                                 fprintf(stderr,
 848                                     "line %d: bad # of partitions\n", lineno);
 849                                 lp->d_npartitions = MAXPARTITIONS;
 850                                 errors++;
 851                         } else if (v < DEFPARTITIONS) {
 852                                 fprintf(stderr,
 853                                     "line %d: bad # of partitions\n", lineno);
 854                                 lp->d_npartitions = DEFPARTITIONS;
 855                                 errors++;
 856                         } else
 857                                 lp->d_npartitions = v;
 858                         continue;
 859                 }
 860                 if (tp == NULL)
 861                         tp = blank;
 862                 if (!strcmp(cp, "disk")) {
 863                         strncpy(lp->d_typename, tp, sizeof (lp->d_typename));
 864                         continue;
 865                 }
 866                 if (!strcmp(cp, "label")) {
 867                         strncpy(lp->d_packname, tp, sizeof (lp->d_packname));
 868                         continue;
 869                 }
 870                 if (!strcmp(cp, "bytes/sector")) {
 871                         v = strtoul(tp, NULL, 10);
 872                         if (v == 0 || (v % DEV_BSIZE) != 0) {
 873                                 fprintf(stderr,
 874                                     "line %d: %s: bad sector size\n",
 875                                     lineno, tp);
 876                                 errors++;
 877                         } else
 878                                 lp->d_secsize = v;
 879                         continue;
 880                 }
 881                 if (!strcmp(cp, "sectors/track")) {
 882                         v = strtoul(tp, NULL, 10);
 883 #if (ULONG_MAX != 0xffffffffUL)
 884                         if (v == 0 || v > 0xffffffff)
 885 #else
 886                         if (v == 0)
 887 #endif
 888                         {
 889                                 fprintf(stderr, "line %d: %s: bad %s\n",
 890                                     lineno, tp, cp);
 891                                 errors++;
 892                         } else
 893                                 lp->d_nsectors = v;
 894                         continue;
 895                 }
 896                 if (!strcmp(cp, "sectors/cylinder")) {
 897                         v = strtoul(tp, NULL, 10);
 898                         if (v == 0) {
 899                                 fprintf(stderr, "line %d: %s: bad %s\n",
 900                                     lineno, tp, cp);
 901                                 errors++;
 902                         } else
 903                                 lp->d_secpercyl = v;
 904                         continue;
 905                 }
 906                 if (!strcmp(cp, "tracks/cylinder")) {
 907                         v = strtoul(tp, NULL, 10);
 908                         if (v == 0) {
 909                                 fprintf(stderr, "line %d: %s: bad %s\n",
 910                                     lineno, tp, cp);
 911                                 errors++;
 912                         } else
 913                                 lp->d_ntracks = v;
 914                         continue;
 915                 }
 916                 if (!strcmp(cp, "cylinders")) {
 917                         v = strtoul(tp, NULL, 10);
 918                         if (v == 0) {
 919                                 fprintf(stderr, "line %d: %s: bad %s\n",
 920                                     lineno, tp, cp);
 921                                 errors++;
 922                         } else
 923                                 lp->d_ncylinders = v;
 924                         continue;
 925                 }
 926                 if (!strcmp(cp, "sectors/unit")) {
 927                         v = strtoul(tp, NULL, 10);
 928                         if (v == 0) {
 929                                 fprintf(stderr, "line %d: %s: bad %s\n",
 930                                     lineno, tp, cp);
 931                                 errors++;
 932                         } else
 933                                 lp->d_secperunit = v;
 934                         continue;
 935                 }
 936                 if (!strcmp(cp, "rpm")) {
 937                         v = strtoul(tp, NULL, 10);
 938                         if (v == 0 || v > USHRT_MAX) {
 939                                 fprintf(stderr, "line %d: %s: bad %s\n",
 940                                     lineno, tp, cp);
 941                                 errors++;
 942                         } else
 943                                 lp->d_rpm = v;
 944                         continue;
 945                 }
 946                 if (!strcmp(cp, "interleave")) {
 947                         v = strtoul(tp, NULL, 10);
 948                         if (v == 0 || v > USHRT_MAX) {
 949                                 fprintf(stderr, "line %d: %s: bad %s\n",
 950                                     lineno, tp, cp);
 951                                 errors++;
 952                         } else
 953                                 lp->d_interleave = v;
 954                         continue;
 955                 }
 956                 if (!strcmp(cp, "trackskew")) {
 957                         v = strtoul(tp, NULL, 10);
 958                         if (v > USHRT_MAX) {
 959                                 fprintf(stderr, "line %d: %s: bad %s\n",
 960                                     lineno, tp, cp);
 961                                 errors++;
 962                         } else
 963                                 lp->d_trackskew = v;
 964                         continue;
 965                 }
 966                 if (!strcmp(cp, "cylinderskew")) {
 967                         v = strtoul(tp, NULL, 10);
 968                         if (v > USHRT_MAX) {
 969                                 fprintf(stderr, "line %d: %s: bad %s\n",
 970                                     lineno, tp, cp);
 971                                 errors++;
 972                         } else
 973                                 lp->d_cylskew = v;
 974                         continue;
 975                 }
 976                 if (!strcmp(cp, "headswitch")) {
 977                         v = strtoul(tp, NULL, 10);
 978                         lp->d_headswitch = v;
 979                         continue;
 980                 }
 981                 if (!strcmp(cp, "track-to-track seek")) {
 982                         v = strtoul(tp, NULL, 10);
 983                         lp->d_trkseek = v;
 984                         continue;
 985                 }
 986                 /* the ':' was removed above */
 987                 if (*cp < 'a' || *cp > MAX_PART || cp[1] != '\0') {
 988                         fprintf(stderr,
 989                             "line %d: %s: Unknown disklabel field\n", lineno,
 990                             cp);
 991                         errors++;
 992                         continue;
 993                 }
 994
 995                 /* Process a partition specification line. */
 996                 part = *cp - 'a';
 997                 if (part >= lp->d_npartitions) {
 998                         fprintf(stderr,
 999                             "line %d: partition name out of range a-%c: %s\n",
1000                             lineno, 'a' + lp->d_npartitions - 1, cp);
1001                         errors++;
1002                         continue;
1003                 }
1004                 part_set[part] = 1;
1005
1006                 if (getasciipartspec(tp, lp, part, lineno) != 0) {
1007                         errors++;
1008                         break;
1009                 }
1010         }
1011         errors += checklabel(lp);
1012         return (errors == 0);
1013 }
1014
1015 #define NXTNUM(n) do { \
1016         if (tp == NULL) { \
1017                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1018                 return (1); \
1019         } else { \
1020                 cp = tp, tp = word(cp); \
1021                 (n) = strtoul(cp, NULL, 10); \
1022         } \
1023 } while (0)
1024
1025 /* retain 1 character following number */
1026 #define NXTWORD(w,n) do { \
1027         if (tp == NULL) { \
1028                 fprintf(stderr, "line %d: too few numeric fields\n", lineno); \
1029                 return (1); \
1030         } else { \
1031                 char *tmp; \
1032                 cp = tp, tp = word(cp); \
1033                 (n) = strtoul(cp, &tmp, 10); \
1034                 if (tmp) (w) = *tmp; \
1035         } \
1036 } while (0)
1037
1038 /*
1039  * Read a partition line into partition `part' in the specified disklabel.
1040  * Return 0 on success, 1 on failure.
1041  */
1042 static int
1043 getasciipartspec(char *tp, struct disklabel *lp, int part, int lineno)
1044 {
1045         struct partition *pp;
1046         char *cp, *endp;
1047         const char **cpp;
1048         u_long v;
1049
1050         pp = &lp->d_partitions[part];
1051         cp = NULL;
1052
1053         v = 0;
1054         NXTWORD(part_size_type[part],v);
1055         if (v == 0 && part_size_type[part] != '*') {
1056                 fprintf(stderr,
1057                     "line %d: %s: bad partition size\n", lineno, cp);
1058                 return (1);
1059         }
1060         pp->p_size = v;
1061
1062         v = 0;
1063         NXTWORD(part_offset_type[part],v);
1064         if (v == 0 && part_offset_type[part] != '*' &&
1065             part_offset_type[part] != '\0') {
1066                 fprintf(stderr,
1067                     "line %d: %s: bad partition offset\n", lineno, cp);
1068                 return (1);
1069         }
1070         pp->p_offset = v;
1071         if (tp == NULL) {
1072                 fprintf(stderr, "line %d: missing file system type\n", lineno);
1073                 return (1);
1074         }
1075         cp = tp, tp = word(cp);
1076         for (cpp = fstypenames; cpp < &fstypenames[FSMAXTYPES]; cpp++)
1077                 if (*cpp && !strcmp(*cpp, cp))
1078                         break;
1079         if (*cpp != NULL) {
1080                 pp->p_fstype = cpp - fstypenames;
1081         } else {
1082                 if (isdigit(*cp)) {
1083                         errno = 0;
1084                         v = strtoul(cp, &endp, 10);
1085                         if (errno != 0 || *endp != '\0')
1086                                 v = FSMAXTYPES;
1087                 } else
1088                         v = FSMAXTYPES;
1089                 if (v >= FSMAXTYPES) {
1090                         fprintf(stderr,
1091                             "line %d: Warning, unknown file system type %s\n",
1092                             lineno, cp);
1093                         v = FS_UNUSED;
1094                 }
1095                 pp->p_fstype = v;
1096         }
1097
1098         switch (pp->p_fstype) {
1099         case FS_UNUSED:
1100         case FS_BSDFFS:
1101         case FS_BSDLFS:
1102                 /* accept defaults for fsize/frag/cpg */
1103                 if (tp) {
1104                         NXTNUM(pp->p_fsize);
1105                         if (pp->p_fsize == 0)
1106                                 break;
1107                         NXTNUM(v);
1108                         pp->p_frag = v / pp->p_fsize;
1109                         if (tp != NULL)
1110                                 NXTNUM(pp->p_cpg);
1111                 }
1112                 /* else default to 0's */
1113                 break;
1114         default:
1115                 break;
1116         }
1117         return (0);
1118 }
1119
1120 /*
1121  * Check disklabel for errors and fill in
1122  * derived fields according to supplied values.
1123  */
1124 static int
1125 checklabel(struct disklabel *lp)
1126 {
1127         struct partition *pp;
1128         int i, errors = 0;
1129         char part;
1130         u_long base_offset, needed, total_size, total_percent, current_offset;
1131         long free_space;
1132         int seen_default_offset;
1133         int hog_part;
1134         int j;
1135         struct partition *pp2;
1136
1137         if (lp == NULL)
1138                 lp = &lab;
1139
1140         if (allfields) {
1141
1142                 if (lp->d_secsize == 0) {
1143                         fprintf(stderr, "sector size 0\n");
1144                         return (1);
1145                 }
1146                 if (lp->d_nsectors == 0) {
1147                         fprintf(stderr, "sectors/track 0\n");
1148                         return (1);
1149                 }
1150                 if (lp->d_ntracks == 0) {
1151                         fprintf(stderr, "tracks/cylinder 0\n");
1152                         return (1);
1153                 }
1154                 if  (lp->d_ncylinders == 0) {
1155                         fprintf(stderr, "cylinders/unit 0\n");
1156                         errors++;
1157                 }
1158                 if (lp->d_rpm == 0)
1159                         warnx("revolutions/minute 0");
1160                 if (lp->d_secpercyl == 0)
1161                         lp->d_secpercyl = lp->d_nsectors * lp->d_ntracks;
1162                 if (lp->d_secperunit == 0)
1163                         lp->d_secperunit = lp->d_secpercyl * lp->d_ncylinders;
1164                 if (lp->d_bbsize == 0) {
1165                         fprintf(stderr, "boot block size 0\n");
1166                         errors++;
1167                 } else if (lp->d_bbsize % lp->d_secsize)
1168                         warnx("boot block size %% sector-size != 0");
1169                 if (lp->d_npartitions > MAXPARTITIONS) {
1170                         warnx("number of partitions (%lu) > MAXPARTITIONS (%d)",
1171                             (u_long)lp->d_npartitions, MAXPARTITIONS);
1172                         errors++;
1173                 }
1174                 if (lp->d_npartitions < DEFPARTITIONS) {
1175                         warnx("number of partitions (%lu) < DEFPARTITIONS (%d)",
1176                             (u_long)lp->d_npartitions, DEFPARTITIONS);
1177                         errors++;
1178                 }
1179         } else {
1180                 struct disklabel *vl;
1181
1182                 vl = getvirginlabel();
1183                 if (lp->d_secsize == 0)
1184                         lp->d_secsize = vl->d_secsize;
1185                 if (lp->d_nsectors == 0)
1186                         lp->d_nsectors = vl->d_nsectors;
1187                 if (lp->d_ntracks == 0)
1188                         lp->d_ntracks = vl->d_ntracks;
1189                 if (lp->d_ncylinders == 0)
1190                         lp->d_ncylinders = vl->d_ncylinders;
1191                 if (lp->d_rpm == 0)
1192                         lp->d_rpm = vl->d_rpm;
1193                 if (lp->d_interleave == 0)
1194                         lp->d_interleave = vl->d_interleave;
1195                 if (lp->d_secpercyl == 0)
1196                         lp->d_secpercyl = vl->d_secpercyl;
1197                 if (lp->d_secperunit == 0 ||
1198                     lp->d_secperunit > vl->d_secperunit)
1199                         lp->d_secperunit = vl->d_secperunit;
1200                 if (lp->d_bbsize == 0)
1201                         lp->d_bbsize = vl->d_bbsize;
1202                 if (lp->d_npartitions < DEFPARTITIONS ||
1203                     lp->d_npartitions > MAXPARTITIONS)
1204                         lp->d_npartitions = vl->d_npartitions;
1205         }
1206
1207
1208         /* first allocate space to the partitions, then offsets */
1209         total_size = 0; /* in sectors */
1210         total_percent = 0; /* in percent */
1211         hog_part = -1;
1212         /* find all fixed partitions */
1213         for (i = 0; i < lp->d_npartitions; i++) {
1214                 pp = &lp->d_partitions[i];
1215                 if (part_set[i]) {
1216                         if (part_size_type[i] == '*') {
1217                                 if (i == RAW_PART) {
1218                                         pp->p_size = lp->d_secperunit;
1219                                 } else {
1220                                         if (hog_part != -1)
1221                                                 warnx("Too many '*' partitions (%c and %c)",
1222                                                     hog_part + 'a',i + 'a');
1223                                         else
1224                                                 hog_part = i;
1225                                 }
1226                         } else {
1227                                 off_t size;
1228
1229                                 size = pp->p_size;
1230                                 switch (part_size_type[i]) {
1231                                 case '%':
1232                                         total_percent += size;
1233                                         break;
1234                                 case 't':
1235                                 case 'T':
1236                                         size *= 1024ULL;
1237                                         /* FALLTHROUGH */
1238                                 case 'g':
1239                                 case 'G':
1240                                         size *= 1024ULL;
1241                                         /* FALLTHROUGH */
1242                                 case 'm':
1243                                 case 'M':
1244                                         size *= 1024ULL;
1245                                         /* FALLTHROUGH */
1246                                 case 'k':
1247                                 case 'K':
1248                                         size *= 1024ULL;
1249                                         break;
1250                                 case '\0':
1251                                         break;
1252                                 default:
1253                                         warnx("unknown multiplier suffix '%c' for partition %c (should be K, M, G or T)",
1254                                             part_size_type[i], i + 'a');
1255                                         break;
1256                                 }
1257                                 /* don't count %'s yet */
1258                                 if (part_size_type[i] != '%') {
1259                                         /*
1260                                          * for all not in sectors, convert to
1261                                          * sectors
1262                                          */
1263                                         if (part_size_type[i] != '\0') {
1264                                                 if (size % lp->d_secsize != 0)
1265                                                         warnx("partition %c not an integer number of sectors",
1266                                                             i + 'a');
1267                                                 size /= lp->d_secsize;
1268                                                 pp->p_size = size;
1269                                         }
1270                                         /* else already in sectors */
1271                                         if (i != RAW_PART)
1272                                                 total_size += size;
1273                                 }
1274                         }
1275                 }
1276         }
1277
1278         /* Find out the total free space, excluding the boot block area. */
1279         base_offset = BBSIZE / secsize;
1280         free_space = 0;
1281         for (i = 0; i < lp->d_npartitions; i++) {
1282                 pp = &lp->d_partitions[i];
1283                 if (!part_set[i] || i == RAW_PART ||
1284                     part_size_type[i] == '%' || part_size_type[i] == '*')
1285                         continue;
1286                 if (pp->p_offset > base_offset)
1287                         free_space += pp->p_offset - base_offset;
1288                 if (pp->p_offset + pp->p_size > base_offset)
1289                         base_offset = pp->p_offset + pp->p_size;
1290         }
1291         if (base_offset < lp->d_secperunit)
1292                 free_space += lp->d_secperunit - base_offset;
1293
1294         /* handle % partitions - note %'s don't need to add up to 100! */
1295         if (total_percent != 0) {
1296                 if (total_percent > 100) {
1297                         fprintf(stderr,"total percentage %lu is greater than 100\n",
1298                             total_percent);
1299                         errors++;
1300                 }
1301
1302                 if (free_space > 0) {
1303                         for (i = 0; i < lp->d_npartitions; i++) {
1304                                 pp = &lp->d_partitions[i];
1305                                 if (part_set[i] && part_size_type[i] == '%') {
1306                                         /* careful of overflows! and integer roundoff */
1307                                         pp->p_size = ((double)pp->p_size/100) * free_space;
1308                                         total_size += pp->p_size;
1309
1310                                         /* FIX we can lose a sector or so due to roundoff per
1311                                            partition.  A more complex algorithm could avoid that */
1312                                 }
1313                         }
1314                 } else {
1315                         fprintf(stderr,
1316                             "%ld sectors available to give to '*' and '%%' partitions\n",
1317                             free_space);
1318                         errors++;
1319                         /* fix?  set all % partitions to size 0? */
1320                 }
1321         }
1322         /* give anything remaining to the hog partition */
1323         if (hog_part != -1) {
1324                 /*
1325                  * Find the range of offsets usable by '*' partitions around
1326                  * the hog partition and how much space they need.
1327                  */
1328                 needed = 0;
1329                 base_offset = BBSIZE / secsize;
1330                 for (i = hog_part - 1; i >= 0; i--) {
1331                         pp = &lp->d_partitions[i];
1332                         if (!part_set[i] || i == RAW_PART)
1333                                 continue;
1334                         if (part_offset_type[i] == '*') {
1335                                 needed += pp->p_size;
1336                                 continue;
1337                         }
1338                         base_offset = pp->p_offset + pp->p_size;
1339                         break;
1340                 }
1341                 current_offset = lp->d_secperunit;
1342                 for (i = lp->d_npartitions - 1; i > hog_part; i--) {
1343                         pp = &lp->d_partitions[i];
1344                         if (!part_set[i] || i == RAW_PART)
1345                                 continue;
1346                         if (part_offset_type[i] == '*') {
1347                                 needed += pp->p_size;
1348                                 continue;
1349                         }
1350                         current_offset = pp->p_offset;
1351                 }
1352
1353                 if (current_offset - base_offset <= needed) {
1354                         fprintf(stderr, "Cannot find space for partition %c\n",
1355                             hog_part + 'a');
1356                         fprintf(stderr,
1357                             "Need more than %lu sectors between %lu and %lu\n",
1358                             needed, base_offset, current_offset);
1359                         errors++;
1360                         lp->d_partitions[hog_part].p_size = 0;
1361                 } else {
1362                         lp->d_partitions[hog_part].p_size = current_offset -
1363                             base_offset - needed;
1364                         total_size += lp->d_partitions[hog_part].p_size;
1365                 }
1366         }
1367
1368         /* Now set the offsets for each partition */
1369         current_offset = BBSIZE / secsize; /* in sectors */
1370         seen_default_offset = 0;
1371         for (i = 0; i < lp->d_npartitions; i++) {
1372                 part = 'a' + i;
1373                 pp = &lp->d_partitions[i];
1374                 if (part_set[i]) {
1375                         if (part_offset_type[i] == '*') {
1376                                 if (i == RAW_PART) {
1377                                         pp->p_offset = 0;
1378                                 } else {
1379                                         pp->p_offset = current_offset;
1380                                         seen_default_offset = 1;
1381                                 }
1382                         } else {
1383                                 /* allow them to be out of order for old-style tables */
1384                                 if (pp->p_offset < current_offset &&
1385                                     seen_default_offset && i != RAW_PART &&
1386                                     pp->p_fstype != FS_VINUM) {
1387                                         fprintf(stderr,
1388 "Offset %ld for partition %c overlaps previous partition which ends at %lu\n",
1389                                             (long)pp->p_offset,i+'a',current_offset);
1390                                         fprintf(stderr,
1391 "Labels with any *'s for offset must be in ascending order by sector\n");
1392                                         errors++;
1393                                 } else if (pp->p_offset != current_offset &&
1394                                     i != RAW_PART && seen_default_offset) {
1395                                         /*
1396                                          * this may give unneeded warnings if
1397                                          * partitions are out-of-order
1398                                          */
1399                                         warnx(
1400 "Offset %ld for partition %c doesn't match expected value %ld",
1401                                             (long)pp->p_offset, i + 'a', current_offset);
1402                                 }
1403                         }
1404                         if (i != RAW_PART)
1405                                 current_offset = pp->p_offset + pp->p_size;
1406                 }
1407         }
1408
1409         for (i = 0; i < lp->d_npartitions; i++) {
1410                 part = 'a' + i;
1411                 pp = &lp->d_partitions[i];
1412                 if (pp->p_size == 0 && pp->p_offset != 0)
1413                         warnx("partition %c: size 0, but offset %lu",
1414                             part, (u_long)pp->p_offset);
1415 #ifdef notdef
1416                 if (pp->p_size % lp->d_secpercyl)
1417                         warnx("partition %c: size %% cylinder-size != 0",
1418                             part);
1419                 if (pp->p_offset % lp->d_secpercyl)
1420                         warnx("partition %c: offset %% cylinder-size != 0",
1421                             part);
1422 #endif
1423                 if (pp->p_offset > lp->d_secperunit) {
1424                         fprintf(stderr,
1425                             "partition %c: offset past end of unit\n", part);
1426                         errors++;
1427                 }
1428                 if (pp->p_offset + pp->p_size > lp->d_secperunit) {
1429                         fprintf(stderr,
1430                         "partition %c: partition extends past end of unit\n",
1431                             part);
1432                         errors++;
1433                 }
1434                 if (i == RAW_PART) {
1435                         if (pp->p_fstype != FS_UNUSED)
1436                                 warnx("partition %c is not marked as unused!",part);
1437                         if (pp->p_offset != 0)
1438                                 warnx("partition %c doesn't start at 0!",part);
1439                         if (pp->p_size != lp->d_secperunit)
1440                                 warnx("partition %c doesn't cover the whole unit!",part);
1441
1442                         if ((pp->p_fstype != FS_UNUSED) || (pp->p_offset != 0) ||
1443                             (pp->p_size != lp->d_secperunit)) {
1444                                 warnx("An incorrect partition %c may cause problems for "
1445                                     "standard system utilities",part);
1446                         }
1447                 }
1448
1449                 /* check for overlaps */
1450                 /* this will check for all possible overlaps once and only once */
1451                 for (j = 0; j < i; j++) {
1452                         pp2 = &lp->d_partitions[j];
1453                         if (j != RAW_PART && i != RAW_PART &&
1454                             pp->p_fstype != FS_VINUM &&
1455                             pp2->p_fstype != FS_VINUM &&
1456                             part_set[i] && part_set[j]) {
1457                                 if (pp2->p_offset < pp->p_offset + pp->p_size &&
1458                                     (pp2->p_offset + pp2->p_size > pp->p_offset ||
1459                                         pp2->p_offset >= pp->p_offset)) {
1460                                         fprintf(stderr,"partitions %c and %c overlap!\n",
1461                                             j + 'a', i + 'a');
1462                                         errors++;
1463                                 }
1464                         }
1465                 }
1466         }
1467         for (; i < lp->d_npartitions; i++) {
1468                 part = 'a' + i;
1469                 pp = &lp->d_partitions[i];
1470                 if (pp->p_size || pp->p_offset)
1471                         warnx("unused partition %c: size %d offset %lu",
1472                             'a' + i, pp->p_size, (u_long)pp->p_offset);
1473         }
1474         return (errors);
1475 }
1476
1477 /*
1478  * When operating on a "virgin" disk, try getting an initial label
1479  * from the associated device driver.  This might work for all device
1480  * drivers that are able to fetch some initial device parameters
1481  * without even having access to a (BSD) disklabel, like SCSI disks,
1482  * most IDE drives, or vn devices.
1483  *
1484  * The device name must be given in its "canonical" form.
1485  */
1486 static struct disklabel *
1487 getvirginlabel(void)
1488 {
1489         static struct disklabel loclab;
1490         struct partition *dp;
1491         int f;
1492         u_int u;
1493
1494         if ((f = open(specname, O_RDONLY)) == -1) {
1495                 warn("cannot open %s", specname);
1496                 return (NULL);
1497         }
1498
1499         if (is_file)
1500                 get_file_parms(f);
1501         else {
1502                 mediasize = g_mediasize(f);
1503                 secsize = g_sectorsize(f);
1504                 if (secsize < 0 || mediasize < 0) {
1505                         close (f);
1506                         return (NULL);
1507                 }
1508         }
1509         memset(&loclab, 0, sizeof loclab);
1510         loclab.d_magic = DISKMAGIC;
1511         loclab.d_magic2 = DISKMAGIC;
1512         loclab.d_secsize = secsize;
1513         loclab.d_secperunit = mediasize / secsize;
1514
1515         /*
1516          * Nobody in these enlightened days uses the CHS geometry for
1517          * anything, but nonetheless try to get it right.  If we fail
1518          * to get any good ideas from the device, construct something
1519          * which is IBM-PC friendly.
1520          */
1521         if (ioctl(f, DIOCGFWSECTORS, &u) == 0)
1522                 loclab.d_nsectors = u;
1523         else
1524                 loclab.d_nsectors = 63;
1525         if (ioctl(f, DIOCGFWHEADS, &u) == 0)
1526                 loclab.d_ntracks = u;
1527         else if (loclab.d_secperunit <= 63*1*1024)
1528                 loclab.d_ntracks = 1;
1529         else if (loclab.d_secperunit <= 63*16*1024)
1530                 loclab.d_ntracks = 16;
1531         else
1532                 loclab.d_ntracks = 255;
1533         loclab.d_secpercyl = loclab.d_ntracks * loclab.d_nsectors;
1534         loclab.d_ncylinders = loclab.d_secperunit / loclab.d_secpercyl;
1535         loclab.d_npartitions = DEFPARTITIONS;
1536
1537         /* Various (unneeded) compat stuff */
1538         loclab.d_rpm = 3600;
1539         loclab.d_bbsize = BBSIZE;
1540         loclab.d_interleave = 1;
1541         strncpy(loclab.d_typename, "amnesiac",
1542             sizeof(loclab.d_typename));
1543
1544         dp = &loclab.d_partitions[RAW_PART];
1545         dp->p_size = loclab.d_secperunit;
1546         loclab.d_checksum = dkcksum(&loclab);
1547         close (f);
1548         return (&loclab);
1549 }
1550
1551 static void
1552 usage(void)
1553 {
1554
1555         fprintf(stderr,
1556         "%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",
1557         "usage: bsdlabel disk",
1558         "\t\t(to read label)",
1559         "       bsdlabel -w [-n] [-m machine] disk [type]",
1560         "\t\t(to write label with existing boot program)",
1561         "       bsdlabel -e [-n] [-m machine] disk",
1562         "\t\t(to edit label)",
1563         "       bsdlabel -R [-n] [-m machine] disk protofile",
1564         "\t\t(to restore label with existing boot program)",
1565         "       bsdlabel -B [-b boot] [-m machine] disk",
1566         "\t\t(to install boot program with existing on-disk label)",
1567         "       bsdlabel -w -B [-n] [-b boot] [-m machine] disk [type]",
1568         "\t\t(to write label and install boot program)",
1569         "       bsdlabel -R -B [-n] [-b boot] [-m machine] disk protofile",
1570                 "\t\t(to restore label and install boot program)"
1571         );
1572         exit(1);
1573 }