lib/hexdump.c

   1 /* hexdump.c - hexdump function */
   2 /*
   3  *  GRUB  --  GRand Unified Bootloader
   4  *  Copyright (C) 2008  Free Software Foundation, Inc.
   5  *
   6  *  GRUB is free software: you can redistribute it and/or modify
   7  *  it under the terms of the GNU General Public License as published by
   8  *  the Free Software Foundation, either version 3 of the License, or
   9  *  (at your option) any later version.
  10  *
  11  *  GRUB is distributed in the hope that it will be useful,
  12  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  *  GNU General Public License for more details.
  15  *
  16  *  You should have received a copy of the GNU General Public License
  17  *  along with GRUB.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19
  20 #include <grub/types.h>
  21 #include <grub/misc.h>
  22 #include <grub/lib/hexdump.h>
  23
  24 void
  25 hexdump (unsigned long bse, char *buf, int len)
  26 {
  27   int pos;
  28   char line[80];
  29
  30   while (len > 0)
  31     {
  32       int cnt, i;
  33
  34       pos = grub_sprintf (line, "%08lx  ", bse);
  35       cnt = 16;
  36       if (cnt > len)
  37         cnt = len;
  38
  39       for (i = 0; i < cnt; i++)
  40         {
  41           pos += grub_sprintf (&line[pos], "%02x ", (unsigned char) buf[i]);
  42           if ((i & 7) == 7)
  43             line[pos++] = ' ';
  44         }
  45
  46       for (; i < 16; i++)
  47         {
  48           pos += grub_sprintf (&line[pos], "   ");
  49           if ((i & 7) == 7)
  50             line[pos++] = ' ';
  51         }
  52
  53       line[pos++] = '|';
  54
  55       for (i = 0; i < cnt; i++)
  56         line[pos++] = ((buf[i] >= 32) && (buf[i] < 127)) ? buf[i] : '.';
  57
  58       line[pos++] = '|';
  59
  60       line[pos] = 0;
  61
  62       grub_printf ("%s\n", line);
  63
  64       /* Print only first and last line if more than 3 lines are identical.  */
  65       if (len >= 4 * 16
  66           && ! grub_memcmp (buf, buf + 1 * 16, 16)
  67           && ! grub_memcmp (buf, buf + 2 * 16, 16)
  68           && ! grub_memcmp (buf, buf + 3 * 16, 16))
  69         {
  70           grub_printf ("*\n");
  71           do
  72             {
  73               bse += 16;
  74               buf += 16;
  75               len -= 16;
  76             }
  77           while (len >= 3 * 16 && ! grub_memcmp (buf, buf + 2 * 16, 16));
  78         }
  79
  80       bse += 16;
  81       buf += 16;
  82       len -= cnt;
  83     }
  84 }