src/ptgen.c

   1 /*
   2  * ptgen - partition table generator
   3  * Copyright (C) 2006 by Felix Fietkau <nbd@nbd.name>
   4  *
   5  * uses parts of afdisk
   6  * Copyright (C) 2002 by David Roetzel <david@roetzel.de>
   7  *
   8  * UUID/GUID definition stolen from kernel/include/uapi/linux/uuid.h
   9  * Copyright (C) 2010, Intel Corp. Huang Ying <ying.huang@intel.com>
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License as published by
  13  * the Free Software Foundation; either version 2 of the License, or
  14  * (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  24  */
  25
  26 #include <sys/types.h>
  27 #include <sys/stat.h>
  28 #include <string.h>
  29 #include <unistd.h>
  30 #include <stdlib.h>
  31 #include <stdio.h>
  32 #include <stdint.h>
  33 #include <stdbool.h>
  34 #include <ctype.h>
  35 #include <inttypes.h>
  36 #include <fcntl.h>
  37 #include <stdint.h>
  38 #include "cyg_crc.h"
  39
  40 #if __BYTE_ORDER == __BIG_ENDIAN
  41 #define cpu_to_le16(x) bswap_16(x)
  42 #define cpu_to_le32(x) bswap_32(x)
  43 #define cpu_to_le64(x) bswap_64(x)
  44 #elif __BYTE_ORDER == __LITTLE_ENDIAN
  45 #define cpu_to_le16(x) (x)
  46 #define cpu_to_le32(x) (x)
  47 #define cpu_to_le64(x) (x)
  48 #else
  49 #error unknown endianness!
  50 #endif
  51
  52 #define swap(a, b) \
  53         do { typeof(a) __tmp = (a); (a) = (b); (b) = __tmp; } while (0)
  54
  55 typedef struct {
  56         uint8_t b[16];
  57 } guid_t;
  58
  59 #define GUID_INIT(a, b, c, d0, d1, d2, d3, d4, d5, d6, d7)                      \
  60 ((guid_t)                                                               \
  61 {{ (a) & 0xff, ((a) >> 8) & 0xff, ((a) >> 16) & 0xff, ((a) >> 24) & 0xff, \
  62    (b) & 0xff, ((b) >> 8) & 0xff,                                       \
  63    (c) & 0xff, ((c) >> 8) & 0xff,                                       \
  64    (d0), (d1), (d2), (d3), (d4), (d5), (d6), (d7) }})
  65
  66 #define GUID_STRING_LENGTH      36
  67
  68 #define GPT_SIGNATURE 0x5452415020494645ULL
  69 #define GPT_REVISION 0x00010000
  70
  71 #define GUID_PARTITION_SYSTEM \
  72         GUID_INIT( 0xC12A7328, 0xF81F, 0x11d2, \
  73                         0xBA, 0x4B, 0x00, 0xA0, 0xC9, 0x3E, 0xC9, 0x3B)
  74
  75 #define GUID_PARTITION_BASIC_DATA \
  76         GUID_INIT( 0xEBD0A0A2, 0xB9E5, 0x4433, \
  77                         0x87, 0xC0, 0x68, 0xB6, 0xB7, 0x26, 0x99, 0xC7)
  78
  79 #define GUID_PARTITION_BIOS_BOOT \
  80         GUID_INIT( 0x21686148, 0x6449, 0x6E6F, \
  81                         0x74, 0x4E, 0x65, 0x65, 0x64, 0x45, 0x46, 0x49)
  82
  83 #define GPT_HEADER_SIZE         92
  84 #define GPT_ENTRY_SIZE          128
  85 #define GPT_ENTRY_MAX           128
  86 #define GPT_ENTRY_NAME_SIZE     72
  87
  88 #define GPT_HEADER_SECTOR       1
  89 #define GPT_FIRST_ENTRY_SECTOR  2
  90
  91 #define MBR_ENTRY_MAX           4
  92 #define MBR_DISK_SIGNATURE_OFFSET  440
  93 #define MBR_PARTITION_ENTRY_OFFSET 446
  94 #define MBR_BOOT_SIGNATURE_OFFSET  510
  95
  96 #define DISK_SECTOR_SIZE        512
  97
  98 /* Partition table entry */
  99 struct pte {
 100         uint8_t active;
 101         uint8_t chs_start[3];
 102         uint8_t type;
 103         uint8_t chs_end[3];
 104         uint32_t start;
 105         uint32_t length;
 106 };
 107
 108 struct partinfo {
 109         unsigned long start;
 110         unsigned long size;
 111         int type;
 112 };
 113
 114 /* GPT Partition table header */
 115 struct gpth {
 116         uint64_t signature;
 117         uint32_t revision;
 118         uint32_t size;
 119         uint32_t crc32;
 120         uint32_t reserved;
 121         uint64_t self;
 122         uint64_t alternate;
 123         uint64_t first_usable;
 124         uint64_t last_usable;
 125         guid_t disk_guid;
 126         uint64_t first_entry;
 127         uint32_t entry_num;
 128         uint32_t entry_size;
 129         uint32_t entry_crc32;
 130 } __attribute__((packed));
 131
 132 /* GPT Partition table entry */
 133 struct gpte {
 134         guid_t type;
 135         guid_t guid;
 136         uint64_t start;
 137         uint64_t end;
 138         uint64_t attr;
 139         char name[GPT_ENTRY_NAME_SIZE];
 140 } __attribute__((packed));
 141
 142
 143 int verbose = 0;
 144 int active = 1;
 145 int heads = -1;
 146 int sectors = -1;
 147 int kb_align = 0;
 148 bool ignore_null_sized_partition = false;
 149 bool use_guid_partition_table = false;
 150 struct partinfo parts[GPT_ENTRY_MAX];
 151 char *filename = NULL;
 152
 153
 154 /*
 155  * parse the size argument, which is either
 156  * a simple number (K assumed) or
 157  * K, M or G
 158  *
 159  * returns the size in KByte
 160  */
 161 static long to_kbytes(const char *string)
 162 {
 163         int exp = 0;
 164         long result;
 165         char *end;
 166
 167         result = strtoul(string, &end, 0);
 168         switch (tolower(*end)) {
 169                 case 'k' :
 170                 case '\0' : exp = 0; break;
 171                 case 'm' : exp = 1; break;
 172                 case 'g' : exp = 2; break;
 173                 default: return 0;
 174         }
 175
 176         if (*end)
 177                 end++;
 178
 179         if (*end) {
 180                 fputs("garbage after end of number\n", stderr);
 181                 return 0;
 182         }
 183
 184         /* result: number + 1024^(exp) */
 185         if (exp == 0)
 186                 return result;
 187         return result * (2 << ((10 * exp) - 1));
 188 }
 189
 190 /* convert the sector number into a CHS value for the partition table */
 191 static void to_chs(long sect, unsigned char chs[3])
 192 {
 193         int c,h,s;
 194
 195         s = (sect % sectors) + 1;
 196         sect = sect / sectors;
 197         h = sect % heads;
 198         sect = sect / heads;
 199         c = sect;
 200
 201         chs[0] = h;
 202         chs[1] = s | ((c >> 2) & 0xC0);
 203         chs[2] = c & 0xFF;
 204
 205         return;
 206 }
 207
 208 /* round the sector number up to the next cylinder */
 209 static inline unsigned long round_to_cyl(long sect)
 210 {
 211         int cyl_size = heads * sectors;
 212
 213         return sect + cyl_size - (sect % cyl_size);
 214 }
 215
 216 /* round the sector number up to the kb_align boundary */
 217 static inline unsigned long round_to_kb(long sect) {
 218         return ((sect - 1) / kb_align + 1) * kb_align;
 219 }
 220
 221 /* Compute a CRC for guid partition table */
 222 static inline unsigned long gpt_crc32(void *buf, unsigned long len)
 223 {
 224         return cyg_crc32_accumulate(~0L, buf, len) ^ ~0L;
 225 }
 226
 227 /* Parse a guid string to guid_t struct */
 228 static inline int guid_parse(char *buf, guid_t *guid)
 229 {
 230         char b[4] = {0};
 231         char *p = buf;
 232         unsigned i = 0;
 233         if (strnlen(buf, GUID_STRING_LENGTH) != GUID_STRING_LENGTH)
 234                 return -1;
 235         for (i = 0; i < sizeof(guid_t); i++) {
 236                 if (*p == '-')
 237                         p++;
 238                 if (*p == '\0')
 239                         return -1;
 240                 memcpy(b, p, 2);
 241                 guid->b[i] = strtol(b, 0, 16);
 242                 p += 2;
 243         }
 244         swap(guid->b[0], guid->b[3]);
 245         swap(guid->b[1], guid->b[2]);
 246         swap(guid->b[4], guid->b[5]);
 247         swap(guid->b[6], guid->b[7]);
 248         return 0;
 249 }
 250
 251 /* init an utf-16 string from utf-8 string */
 252 static inline void init_utf16(char *str, uint16_t *buf, unsigned bufsize)
 253 {
 254         unsigned i, n = 0;
 255         for (i = 0; i < bufsize; i++) {
 256                 if (str[n] == 0x00) {
 257                         buf[i] = 0x00;
 258                         return ;
 259                 } else if ((str[n] & 0x80) == 0x00) {//0xxxxxxx
 260                         buf[i] = cpu_to_le16(str[n++]);
 261                 } else if ((str[n] & 0xE0) == 0xC0) {//110xxxxx
 262                         buf[i] = cpu_to_le16((str[n] & 0x1F) << 6 | (str[n + 1] & 0x3F));
 263                         n += 2;
 264                 } else if ((str[n] & 0xF0) == 0xE0) {//1110xxxx
 265                         buf[i] = cpu_to_le16((str[n] & 0x0F) << 12 | (str[n + 1] & 0x3F) << 6 | (str[n + 2] & 0x3F));
 266                         n += 3;
 267                 } else {
 268                         buf[i] = cpu_to_le16('?');
 269                         n++;
 270                 }
 271         }
 272 }
 273
 274 /* check the partition sizes and write the partition table */
 275 static int gen_ptable(uint32_t signature, int nr)
 276 {
 277         struct pte pte[MBR_ENTRY_MAX];
 278         unsigned long start, len, sect = 0;
 279         int i, fd, ret = -1;
 280
 281         memset(pte, 0, sizeof(struct pte) * MBR_ENTRY_MAX);
 282         for (i = 0; i < nr; i++) {
 283                 if (!parts[i].size) {
 284                         if (ignore_null_sized_partition)
 285                                 continue;
 286                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 287                         return ret;
 288                 }
 289
 290                 pte[i].active = ((i + 1) == active) ? 0x80 : 0;
 291                 pte[i].type = parts[i].type;
 292
 293                 start = sect + sectors;
 294                 if (parts[i].start != 0) {
 295                         if (parts[i].start * 2 < start) {
 296                                 fprintf(stderr, "Invalid start %ld for partition %d!\n",
 297                                         parts[i].start, i);
 298                                 return ret;
 299                         }
 300                         start = parts[i].start * 2;
 301                 } else if (kb_align != 0) {
 302                         start = round_to_kb(start);
 303                 }
 304                 pte[i].start = cpu_to_le32(start);
 305
 306                 sect = start + parts[i].size * 2;
 307                 if (kb_align == 0)
 308                         sect = round_to_cyl(sect);
 309                 pte[i].length = cpu_to_le32(len = sect - start);
 310
 311                 to_chs(start, pte[i].chs_start);
 312                 to_chs(start + len - 1, pte[i].chs_end);
 313
 314                 if (verbose)
 315                         fprintf(stderr, "Partition %d: start=%ld, end=%ld, size=%ld\n",
 316                                         i,
 317                                         (long)start * DISK_SECTOR_SIZE,
 318                                         (long)(start + len) * DISK_SECTOR_SIZE,
 319                                         (long)len * DISK_SECTOR_SIZE);
 320                 printf("%ld\n", (long)start * DISK_SECTOR_SIZE);
 321                 printf("%ld\n", (long)len * DISK_SECTOR_SIZE);
 322         }
 323
 324         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 325                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 326                 return ret;
 327         }
 328
 329         lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
 330         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 331                 fputs("write failed.\n", stderr);
 332                 goto fail;
 333         }
 334
 335         lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
 336         if (write(fd, pte, sizeof(struct pte) * MBR_ENTRY_MAX) != sizeof(struct pte) * MBR_ENTRY_MAX) {
 337                 fputs("write failed.\n", stderr);
 338                 goto fail;
 339         }
 340         lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
 341         if (write(fd, "\x55\xaa", 2) != 2) {
 342                 fputs("write failed.\n", stderr);
 343                 goto fail;
 344         }
 345
 346         ret = 0;
 347 fail:
 348         close(fd);
 349         return ret;
 350 }
 351
 352 /* check the partition sizes and write the guid partition table */
 353 static int gen_gptable(uint32_t signature, guid_t guid, unsigned nr)
 354 {
 355         struct pte pte;
 356         struct gpth gpth = {
 357                 .signature = cpu_to_le64(GPT_SIGNATURE),
 358                 .revision = cpu_to_le32(GPT_REVISION),
 359                 .size = cpu_to_le32(GPT_HEADER_SIZE),
 360                 .self = cpu_to_le64(GPT_HEADER_SECTOR),
 361                 .first_usable = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
 362                 .first_entry = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR),
 363                 .disk_guid = guid,
 364                 .entry_num = cpu_to_le32(GPT_ENTRY_MAX),
 365                 .entry_size = cpu_to_le32(GPT_ENTRY_SIZE),
 366         };
 367         struct gpte  gpte[GPT_ENTRY_MAX];
 368         uint64_t start, end, sect = 0;
 369         int fd, ret = -1;
 370         unsigned i;
 371
 372         memset(gpte, 0, GPT_ENTRY_SIZE * GPT_ENTRY_MAX);
 373         for (i = 0; i < nr; i++) {
 374                 if (!parts[i].size) {
 375                         if (ignore_null_sized_partition)
 376                                 continue;
 377                         fprintf(stderr, "Invalid size in partition %d!\n", i);
 378                         return ret;
 379                 }
 380                 start = sect + sectors;
 381                 if (parts[i].start != 0) {
 382                         if (parts[i].start * 2 < start) {
 383                                 fprintf(stderr, "Invalid start %ld for partition %d!\n",
 384                                         parts[i].start, i);
 385                                 return ret;
 386                         }
 387                         start = parts[i].start * 2;
 388                 } else if (kb_align != 0) {
 389                         start = round_to_kb(start);
 390                 }
 391                 gpte[i].start = cpu_to_le64(start);
 392
 393                 sect = start + parts[i].size * 2;
 394                 if (kb_align == 0)
 395                         sect = round_to_cyl(sect);
 396                 gpte[i].end = cpu_to_le64(sect -1);
 397                 gpte[i].guid = guid;
 398                 gpte[i].guid.b[sizeof(guid_t) -1] += i + 1;
 399                 if (parts[i].type == 0xEF || (i + 1) == (unsigned)active) {
 400                         gpte[i].type = GUID_PARTITION_SYSTEM;
 401                         init_utf16("EFI System Partition", (uint16_t *)gpte[i].name, GPT_ENTRY_NAME_SIZE / sizeof(uint16_t));
 402                 } else {
 403                         gpte[i].type = GUID_PARTITION_BASIC_DATA;
 404                 }
 405
 406                 if (verbose)
 407                         fprintf(stderr, "Partition %d: start=%" PRIu64 ", end=%" PRIu64 ", size=%"  PRIu64 "\n",
 408                                         i,
 409                                         start * DISK_SECTOR_SIZE, sect * DISK_SECTOR_SIZE,
 410                                         (sect - start) * DISK_SECTOR_SIZE);
 411                 printf("%" PRIu64 "\n", start * DISK_SECTOR_SIZE);
 412                 printf("%" PRIu64 "\n", (sect - start) * DISK_SECTOR_SIZE);
 413         }
 414
 415         gpte[GPT_ENTRY_MAX - 1].start = cpu_to_le64(GPT_FIRST_ENTRY_SECTOR + GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE);
 416         gpte[GPT_ENTRY_MAX - 1].end = cpu_to_le64((kb_align ? round_to_kb(sectors) : (unsigned long)sectors) - 1);
 417         gpte[GPT_ENTRY_MAX - 1].type = GUID_PARTITION_BIOS_BOOT;
 418         gpte[GPT_ENTRY_MAX - 1].guid = guid;
 419         gpte[GPT_ENTRY_MAX - 1].guid.b[sizeof(guid_t) -1] += GPT_ENTRY_MAX;
 420
 421         end = sect + sectors - 1;
 422
 423         pte.type = 0xEE;
 424         pte.start = cpu_to_le32(GPT_HEADER_SECTOR);
 425         pte.length = cpu_to_le32(end);
 426         to_chs(GPT_HEADER_SECTOR, pte.chs_start);
 427         to_chs(end, pte.chs_end);
 428
 429         gpth.last_usable = cpu_to_le64(end - GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE - 1);
 430         gpth.alternate = cpu_to_le64(end);
 431         gpth.entry_crc32 = cpu_to_le32(gpt_crc32(gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX));
 432         gpth.crc32 = cpu_to_le32(gpt_crc32((char *)&gpth, GPT_HEADER_SIZE));
 433
 434         if ((fd = open(filename, O_WRONLY|O_CREAT|O_TRUNC, 0644)) < 0) {
 435                 fprintf(stderr, "Can't open output file '%s'\n",filename);
 436                 return ret;
 437         }
 438
 439         lseek(fd, MBR_DISK_SIGNATURE_OFFSET, SEEK_SET);
 440         if (write(fd, &signature, sizeof(signature)) != sizeof(signature)) {
 441                 fputs("write failed.\n", stderr);
 442                 goto fail;
 443         }
 444
 445         lseek(fd, MBR_PARTITION_ENTRY_OFFSET, SEEK_SET);
 446         if (write(fd, &pte, sizeof(struct pte)) != sizeof(struct pte)) {
 447                 fputs("write failed.\n", stderr);
 448                 goto fail;
 449         }
 450
 451         lseek(fd, MBR_BOOT_SIGNATURE_OFFSET, SEEK_SET);
 452         if (write(fd, "\x55\xaa", 2) != 2) {
 453                 fputs("write failed.\n", stderr);
 454                 goto fail;
 455         }
 456
 457         if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
 458                 fputs("write failed.\n", stderr);
 459                 goto fail;
 460         }
 461
 462         lseek(fd, GPT_FIRST_ENTRY_SECTOR * DISK_SECTOR_SIZE, SEEK_SET);
 463         if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
 464                 fputs("write failed.\n", stderr);
 465                 goto fail;
 466         }
 467
 468 #ifdef WANT_ALTERNATE_PTABLE
 469         /* The alternate partition table (We omit it by default) */
 470         swap(gpth.self, gpth.alternate);
 471         gpth.first_entry = cpu_to_le64(end - GPT_ENTRY_SIZE * GPT_ENTRY_MAX / DISK_SECTOR_SIZE),
 472         gpth.crc32 = 0;
 473         gpth.crc32 = cpu_to_le32(gpt_crc32(&gpth, GPT_HEADER_SIZE));
 474
 475         lseek(fd, end * DISK_SECTOR_SIZE - GPT_ENTRY_SIZE * GPT_ENTRY_MAX, SEEK_SET);
 476         if (write(fd, &gpte, GPT_ENTRY_SIZE * GPT_ENTRY_MAX) != GPT_ENTRY_SIZE * GPT_ENTRY_MAX) {
 477                 fputs("write failed.\n", stderr);
 478                 goto fail;
 479         }
 480
 481         lseek(fd, end * DISK_SECTOR_SIZE, SEEK_SET);
 482         if (write(fd, &gpth, GPT_HEADER_SIZE) != GPT_HEADER_SIZE) {
 483                 fputs("write failed.\n", stderr);
 484                 goto fail;
 485         }
 486         lseek(fd, (end + 1) * DISK_SECTOR_SIZE -1, SEEK_SET);
 487         if (write(fd, "\x00", 1) != 1) {
 488                 fputs("write failed.\n", stderr);
 489                 goto fail;
 490         }
 491 #endif
 492
 493         ret = 0;
 494 fail:
 495         close(fd);
 496         return ret;
 497 }
 498
 499 static void usage(char *prog)
 500 {
 501         fprintf(stderr, "Usage: %s [-v] [-n] [-g] -h <heads> -s <sectors> -o <outputfile> [-a 0..4] [-l <align kB>] [-G <guid>] [[-t <type>] -p <size>[@<start>]...] \n", prog);
 502         exit(EXIT_FAILURE);
 503 }
 504
 505 int main (int argc, char **argv)
 506 {
 507         unsigned char type = 0x83;
 508         char *p;
 509         int ch;
 510         int part = 0;
 511         uint32_t signature = 0x5452574F; /* 'OWRT' */
 512         guid_t guid = GUID_INIT( signature, 0x2211, 0x4433, \
 513                         0x55, 0x66, 0x77, 0x88, 0x99, 0xAA, 0xBB, 0x00);
 514
 515         while ((ch = getopt(argc, argv, "h:s:p:a:t:o:vngl:S:G:")) != -1) {
 516                 switch (ch) {
 517                 case 'o':
 518                         filename = optarg;
 519                         break;
 520                 case 'v':
 521                         verbose++;
 522                         break;
 523                 case 'n':
 524                         ignore_null_sized_partition = true;
 525                         break;
 526                 case 'g':
 527                         use_guid_partition_table = 1;
 528                         break;
 529                 case 'h':
 530                         heads = (int)strtoul(optarg, NULL, 0);
 531                         break;
 532                 case 's':
 533                         sectors = (int)strtoul(optarg, NULL, 0);
 534                         break;
 535                 case 'p':
 536                         if (part > GPT_ENTRY_MAX - 1 || (!use_guid_partition_table && part > 3)) {
 537                                 fputs("Too many partitions\n", stderr);
 538                                 exit(EXIT_FAILURE);
 539                         }
 540                         p = strchr(optarg, '@');
 541                         if (p) {
 542                                 *(p++) = 0;
 543                                 parts[part].start = to_kbytes(p);
 544                         }
 545                         parts[part].size = to_kbytes(optarg);
 546                         fprintf(stderr, "part %ld %ld\n", parts[part].start, parts[part].size);
 547                         parts[part++].type = type;
 548                         break;
 549                 case 't':
 550                         type = (char)strtoul(optarg, NULL, 16);
 551                         break;
 552                 case 'a':
 553                         active = (int)strtoul(optarg, NULL, 0);
 554                         if ((active < 0) || (active > 4))
 555                                 active = 0;
 556                         break;
 557                 case 'l':
 558                         kb_align = (int)strtoul(optarg, NULL, 0) * 2;
 559                         break;
 560                 case 'S':
 561                         signature = strtoul(optarg, NULL, 0);
 562                         break;
 563                 case 'G':
 564                         if (guid_parse(optarg, &guid)) {
 565                                 fputs("Invalid guid string\n", stderr);
 566                                 exit(EXIT_FAILURE);
 567                         }
 568                         break;
 569                 case '?':
 570                 default:
 571                         usage(argv[0]);
 572                 }
 573         }
 574         argc -= optind;
 575         if (argc || (heads <= 0) || (sectors <= 0) || !filename)
 576                 usage(argv[0]);
 577
 578         if (use_guid_partition_table)
 579                 return gen_gptable(signature, guid, part) ? EXIT_FAILURE : EXIT_SUCCESS;
 580
 581         return gen_ptable(signature, part) ? EXIT_FAILURE : EXIT_SUCCESS;
 582 }