cgpt/cmd_show.c

/* Copyright (c) 2012 The Chromium OS Authors. All rights reserved.
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#define __STDC_FORMAT_MACROS

#include <getopt.h>
#include <inttypes.h>
#include <string.h>

#include "cgpt.h"
#include "vboot_host.h"

extern const char* progname;

static void Usage(void)
{
  printf("\nUsage: %s show [OPTIONS] DRIVE\n\n"
         "Display the GPT table.\n\n"
         "Units are blocks by default.\n\n"
         "Options:\n"
         "  -D NUM       Size (in bytes) of the disk where partitions reside;\n"
         "                 default 0, meaning partitions and GPT structs are\n"
         "                 both on DRIVE\n"
         "  -n           Numeric output only\n"
         "  -v           Verbose output\n"
         "  -q           Quick output\n"
         "  -i NUM       Show specified partition only\n"
         "  -d           Debug output (including invalid headers)\n"
         "\n"
         "When using -i, specific fields may be displayed using one of:\n"
         "  -b  first block (a.k.a. start of partition)\n"
         "  -s  partition size (in blocks)\n"
         "  -t  type guid\n"
         "  -u  unique guid\n"
         "  -l  label\n"
         "  -S  Successful flag\n"
         "  -T  Tries flag\n"
         "  -P  Priority flag\n"
         "  -R  Required flag\n"
         "  -B  Legacy Boot flag\n"
         "  -A  raw 16-bit attribute value (bits 48-63)\n"
         "\n", progname);
}

int cmd_show(int argc, char *argv[]) {
  CgptShowParams params;
  memset(&params, 0, sizeof(params));

  int c;
  int errorcnt = 0;
  char *e = 0;

  opterr = 0;                     // quiet, you
  while ((c=getopt(argc, argv, ":hnvqi:bstulSTPRBAdD:")) != -1)
  {
    switch (c)
    {
    case 'D':
      params.drive_size = strtoull(optarg, &e, 0);
      errorcnt += check_int_parse(c, e);
      break;
    case 'n':
      params.numeric = 1;
      break;
    case 'v':
      params.verbose = 1;
      break;
    case 'q':
      params.quick = 1;
      break;
    case 'i':
      params.partition = (uint32_t)strtoul(optarg, &e, 0);
      errorcnt += check_int_parse(c, e);
      if (params.partition <= 0) {
        Error("-i requires a number between 1 and 128 (inclusive)\n");
        errorcnt++;
      }
      break;
    case 'b':
    case 's':
    case 't':
    case 'u':
    case 'l':
    case 'S':
    case 'T':
    case 'P':
    case 'R':
    case 'B':
    case 'A':
      if (params.single_item) {
        Error("-%c already specified; rejecting additional -%c\n",
              params.single_item, c);
        Error("Only a single item may be displayed at a time\n");
        errorcnt++;
      }
      params.single_item = c;
      break;

    case 'd':
      params.debug = 1;
      break;

    case 'h':
      Usage();
      return CGPT_OK;
    case '?':
      Error("unrecognized option: -%c\n", optopt);
      errorcnt++;
      break;
    case ':':
      Error("missing argument to -%c\n", optopt);
      errorcnt++;
      break;
    default:
      errorcnt++;
      break;
    }
  }
  if (!params.partition && params.single_item) {
    Error("-i required when displaying a single item\n");
    errorcnt++;
  }
  if (errorcnt)
  {
    Usage();
    return CGPT_FAILED;
  }

  if (optind >= argc) {
    Error("missing drive argument\n");
    Usage();
    return CGPT_FAILED;
  }

  params.drive_name = argv[optind];

  return CgptShow(&params);
}