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May 4th, 2006
Views: 2,420
Dave Sinkula
This is a quick and dirty example of a hex dump utility. Not much in the way of special features -- it just dumps the contents of a hard-coded filename in hex and also shows the characters. An example that can show the basics of making your own.
Last edited : Feb 5th, 2007.
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c Syntax
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  1. The result of feeding this to itself, in this case by using __FILE__, is as follows.
  2.  
  3.          +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F Text
  4.  
  5. 00000000 23 69 6E 63 6C 75 64 65 20 3C 73 74 64 69 6F 2E #include <stdio.
  6.  
  7. 00000010 68 3E 0D 0A 23 69 6E 63 6C 75 64 65 20 3C 63 74 h>..#include <ct
  8.  
  9. 00000020 79 70 65 2E 68 3E 0D 0A 0D 0A 73 69 7A 65 5F 74 ype.h>....size_t
  10.  
  11. 00000030 20 68 65 78 64 75 6D 70 28 46 49 4C 45 20 2A 66  hexdump(FILE *f
  12.  
  13. 00000040 69 6C 65 29 0D 0A 7B 0D 0A 20 20 20 75 6E 73 69 ile)..{..   unsi
  14.  
  15. 00000050 67 6E 65 64 20 63 68 61 72 20 64 61 74 61 5B 31 gned char data[1
  16.  
  17. 00000060 36 5D 3B 0D 0A 20 20 20 73 69 7A 65 5F 74 20 69 6];..   size_t i
  18.  
  19. 00000070 2C 20 6A 2C 20 73 69 7A 65 2C 20 63 6F 75 6E 74 , j, size, count
  20.  
  21. 00000080 20 3D 20 30 3B 0D 0A 20 20 20 2F 2A 0D 0A 20 20  = 0;..   /*..  
  22.  
  23. 00000090 20 20 2A 20 48 65 61 64 69 6E 67 0D 0A 20 20 20   * Heading..   
  24.  
  25. 000000A0 20 2A 2F 0D 0A 20 20 20 66 70 75 74 73 28 22 20  */..   fputs(" 
  26.  
  27. 000000B0 20 20 20 20 20 20 20 20 22 2C 20 73 74 64 6F 75         ", stdou
  28.  
  29. 000000C0 74 29 3B 20 2F 2A 20 73 6B 69 70 20 61 64 64 72 t); /* skip addr
  30.  
  31. 000000D0 65 73 73 20 61 72 65 61 20 2A 2F 0D 0A 20 20 20 ess area */..   
  32.  
  33. 000000E0 66 6F 72 20 28 20 69 20 3D 20 30 3B 20 69 20 3C for ( i = 0; i <
  34.  
  35. 000000F0 20 73 69 7A 65 6F 66 20 64 61 74 61 20 2F 20 73  sizeof data / s
  36.  
  37. 00000100 69 7A 65 6F 66 20 2A 64 61 74 61 3B 20 2B 2B 69 izeof *data; ++i
  38.  
  39. 00000110 20 29 0D 0A 20 20 20 7B 0D 0A 20 20 20 20 20 20  )..   {..      
  40.  
  41. 00000120 70 72 69 6E 74 66 28 22 2B 25 6C 58 20 22 2C 20 printf("+%lX ", 
  42.  
  43. 00000130 28 6C 6F 6E 67 20 75 6E 73 69 67 6E 65 64 29 69 (long unsigned)i
  44.  
  45. 00000140 29 3B 0D 0A 20 20 20 7D 0D 0A 20 20 20 70 75 74 );..   }..   put
  46.  
  47. 00000150 73 28 22 54 65 78 74 22 29 3B 0D 0A 20 20 20 2F s("Text");..   /
  48.  
  49. 00000160 2A 0D 0A 20 20 20 20 2A 20 42 6F 64 79 0D 0A 20 *..    * Body.. 
  50.  
  51. 00000170 20 20 20 2A 2F 0D 0A 20 20 20 64 6F 0D 0A 20 20    */..   do..  
  52.  
  53. 00000180 20 7B 0D 0A 20 20 20 20 20 20 2F 2A 20 52 65 61  {..      /* Rea
  54.  
  55. 00000190 64 20 73 6F 6D 65 20 64 61 74 61 2E 20 2A 2F 0D d some data. */.
  56.  
  57. 000001A0 0A 20 20 20 20 20 20 73 69 7A 65 20 3D 20 66 72 .      size = fr
  58.  
  59. 000001B0 65 61 64 28 64 61 74 61 2C 20 73 69 7A 65 6F 66 ead(data, sizeof
  60.  
  61. 000001C0 20 2A 64 61 74 61 2C 20 73 69 7A 65 6F 66 20 64  *data, sizeof d
  62.  
  63. 000001D0 61 74 61 20 2F 20 73 69 7A 65 6F 66 20 2A 64 61 ata / sizeof *da
  64.  
  65. 000001E0 74 61 2C 20 66 69 6C 65 29 3B 0D 0A 20 20 20 20 ta, file);..    
  66.  
  67. 000001F0 20 20 69 66 20 28 20 73 69 7A 65 20 29 0D 0A 20   if ( size ).. 
  68.  
  69. 00000200 20 20 20 20 20 7B 0D 0A 20 20 20 20 20 20 20 20      {..        
  70.  
  71. 00000210 20 2F 2A 20 50 72 69 6E 74 20 74 68 65 20 62 61  /* Print the ba
  72.  
  73. 00000220 73 65 20 61 64 64 72 65 73 73 2E 20 2A 2F 0D 0A se address. */..
  74.  
  75. 00000230 20 20 20 20 20 20 20 20 20 70 72 69 6E 74 66 28          printf(
  76.  
  77. 00000240 22 25 30 38 6C 58 20 22 2C 20 28 6C 6F 6E 67 20 "%08lX ", (long 
  78.  
  79. 00000250 75 6E 73 69 67 6E 65 64 29 63 6F 75 6E 74 29 3B unsigned)count);
  80.  
  81. 00000260 0D 0A 20 20 20 20 20 20 20 20 20 63 6F 75 6E 74 ..         count
  82.  
  83. 00000270 20 2B 3D 20 73 69 7A 65 3B 20 2F 2A 20 61 64 6A  += size; /* adj
  84.  
  85. 00000280 75 73 74 20 74 68 65 20 62 61 73 65 20 61 64 64 ust the base add
  86.  
  87. 00000290 72 65 73 73 20 2A 2F 0D 0A 20 20 20 20 20 20 20 ress */..       
  88.  
  89. 000002A0 20 20 2F 2A 20 50 72 69 6E 74 20 74 68 65 20 63   /* Print the c
  90.  
  91. 000002B0 68 61 72 61 63 74 65 72 73 27 20 68 65 78 20 76 haracters' hex v
  92.  
  93. 000002C0 61 6C 75 65 73 2E 20 2A 2F 0D 0A 20 20 20 20 20 alues. */..     
  94.  
  95. 000002D0 20 20 20 20 66 6F 72 20 28 20 69 20 3D 20 30 3B     for ( i = 0;
  96.  
  97. 000002E0 20 69 20 3C 20 73 69 7A 65 3B 20 2B 2B 69 20 29  i < size; ++i )
  98.  
  99. 000002F0 0D 0A 20 20 20 20 20 20 20 20 20 7B 0D 0A 20 20 ..         {..  
  100.  
  101. 00000300 20 20 20 20 20 20 20 20 20 20 70 72 69 6E 74 66           printf
  102.  
  103. 00000310 28 22 25 30 32 58 20 22 2C 20 64 61 74 61 5B 69 ("%02X ", data[i
  104.  
  105. 00000320 5D 29 3B 0D 0A 20 20 20 20 20 20 20 20 20 7D 0D ]);..         }.
  106.  
  107. 00000330 0A 20 20 20 20 20 20 20 20 20 2F 2A 20 50 61 64 .         /* Pad
  108.  
  109. 00000340 20 74 68 65 20 68 65 78 20 76 61 6C 75 65 73 20  the hex values 
  110.  
  111. 00000350 61 72 65 61 20 69 66 20 6E 65 63 65 73 73 61 72 area if necessar
  112.  
  113. 00000360 79 2E 20 2A 2F 0D 0A 20 20 20 20 20 20 20 20 20 y. */..         
  114.  
  115. 00000370 66 6F 72 20 28 20 2B 2B 69 3B 20 69 20 3C 3D 20 for ( ++i; i <= 
  116.  
  117. 00000380 73 69 7A 65 6F 66 20 64 61 74 61 20 2F 20 73 69 sizeof data / si
  118.  
  119. 00000390 7A 65 6F 66 20 2A 64 61 74 61 3B 20 2B 2B 69 20 zeof *data; ++i 
  120.  
  121. 000003A0 29 0D 0A 20 20 20 20 20 20 20 20 20 7B 0D 0A 20 )..         {.. 
  122.  
  123. 000003B0 20 20 20 20 20 20 20 20 20 20 20 66 70 75 74 73            fputs
  124.  
  125. 000003C0 28 22 20 20 20 22 2C 20 73 74 64 6F 75 74 29 3B ("   ", stdout);
  126.  
  127. 000003D0 0D 0A 20 20 20 20 20 20 20 20 20 7D 0D 0A 20 20 ..         }..  
  128.  
  129. 000003E0 20 20 20 20 20 20 20 2F 2A 20 50 72 69 6E 74 20        /* Print 
  130.  
  131. 000003F0 74 68 65 20 63 68 61 72 61 63 74 65 72 73 2E 20 the characters. 
  132.  
  133. 00000400 2A 2F 0D 0A 20 20 20 20 20 20 20 20 20 66 6F 72 */..         for
  134.  
  135. 00000410 20 28 20 6A 20 3D 20 30 3B 20 6A 20 3C 20 73 69  ( j = 0; j < si
  136.  
  137. 00000420 7A 65 3B 20 6A 2B 2B 20 29 0D 0A 20 20 20 20 20 ze; j++ )..     
  138.  
  139. 00000430 20 20 20 20 7B 0D 0A 20 20 20 20 20 20 20 20 20     {..         
  140.  
  141. 00000440 20 20 20 70 75 74 63 68 61 72 28 69 73 70 72 69    putchar(ispri
  142.  
  143. 00000450 6E 74 28 64 61 74 61 5B 6A 5D 29 20 3F 20 64 61 nt(data[j]) ? da
  144.  
  145. 00000460 74 61 5B 6A 5D 20 3A 20 27 2E 27 29 3B 0D 0A 20 ta[j] : '.');.. 
  146.  
  147. 00000470 20 20 20 20 20 20 20 20 7D 0D 0A 20 20 20 20 20         }..     
  148.  
  149. 00000480 20 20 20 20 70 75 74 63 68 61 72 28 27 5C 6E 27     putchar('\n'
  150.  
  151. 00000490 29 3B 0D 0A 20 20 20 20 20 20 7D 0D 0A 20 20 20 );..      }..   
  152.  
  153. 000004A0 7D 20 77 68 69 6C 65 20 28 20 73 69 7A 65 20 3D } while ( size =
  154.  
  155. 000004B0 3D 20 73 69 7A 65 6F 66 20 64 61 74 61 20 2F 20 = sizeof data / 
  156.  
  157. 000004C0 73 69 7A 65 6F 66 20 2A 64 61 74 61 20 29 3B 20 sizeof *data ); 
  158.  
  159. 000004D0 2F 2A 20 62 72 65 61 6B 20 6F 6E 20 70 61 72 74 /* break on part
  160.  
  161. 000004E0 69 61 6C 20 62 75 66 66 65 72 20 2A 2F 0D 0A 20 ial buffer */.. 
  162.  
  163. 000004F0 20 20 72 65 74 75 72 6E 20 63 6F 75 6E 74 3B 0D   return count;.
  164.  
  165. 00000500 0A 7D 0D 0A 0D 0A 69 6E 74 20 6D 61 69 6E 28 76 .}....int main(v
  166.  
  167. 00000510 6F 69 64 29 0D 0A 7B 0D 0A 20 20 20 73 74 61 74 oid)..{..   stat
  168.  
  169. 00000520 69 63 20 63 6F 6E 73 74 20 63 68 61 72 20 66 69 ic const char fi
  170.  
  171. 00000530 6C 65 6E 61 6D 65 5B 5D 20 3D 20 5F 5F 46 49 4C lename[] = __FIL
  172.  
  173. 00000540 45 5F 5F 3B 20 2F 2A 20 6D 61 79 20 6E 6F 74 20 E__; /* may not 
  174.  
  175. 00000550 77 6F 72 6B 20 6F 6E 20 65 76 65 72 79 77 68 65 work on everywhe
  176.  
  177. 00000560 72 65 20 2A 2F 0D 0A 20 20 20 46 49 4C 45 20 2A re */..   FILE *
  178.  
  179. 00000570 66 69 6C 65 20 3D 20 66 6F 70 65 6E 28 66 69 6C file = fopen(fil
  180.  
  181. 00000580 65 6E 61 6D 65 2C 20 22 72 62 22 29 3B 0D 0A 20 ename, "rb");.. 
  182.  
  183. 00000590 20 20 69 66 20 28 20 66 69 6C 65 20 21 3D 20 4E   if ( file != N
  184.  
  185. 000005A0 55 4C 4C 20 29 0D 0A 20 20 20 7B 0D 0A 20 20 20 ULL )..   {..   
  186.  
  187. 000005B0 20 20 20 70 72 69 6E 74 66 28 22 25 6C 75 20 62    printf("%lu b
  188.  
  189. 000005C0 79 74 65 73 5C 6E 22 2C 20 28 6C 6F 6E 67 20 75 ytes\n", (long u
  190.  
  191. 000005D0 6E 73 69 67 6E 65 64 29 68 65 78 64 75 6D 70 28 nsigned)hexdump(
  192.  
  193. 000005E0 66 69 6C 65 29 29 3B 0D 0A 20 20 20 20 20 20 66 file));..      f
  194.  
  195. 000005F0 63 6C 6F 73 65 28 66 69 6C 65 29 3B 0D 0A 20 20 close(file);..  
  196.  
  197. 00000600 20 7D 0D 0A 20 20 20 65 6C 73 65 0D 0A 20 20 20  }..   else..   
  198.  
  199. 00000610 7B 0D 0A 20 20 20 20 20 20 70 65 72 72 6F 72 28 {..      perror(
  200.  
  201. 00000620 66 69 6C 65 6E 61 6D 65 29 3B 0D 0A 20 20 20 7D filename);..   }
  202.  
  203. 00000630 0D 0A 20 20 20 72 65 74 75 72 6E 20 30 3B 0D 0A ..   return 0;..
  204.  
  205. 00000640 7D 0D 0A                                        }..
  206.  
  207. 1603 bytes
  208.  
  209.  
  210.  
  211. #include <stdio.h>
  212. #include <ctype.h>
  213.  
  214. size_t hexdump(FILE *file)
  215. {
  216.    unsigned char data[16];
  217.    size_t i, j, size, count = 0;
  218.    /*
  219.     * Heading
  220.     */
  221.    fputs("         ", stdout); /* skip address area */
  222.    for ( i = 0; i < sizeof data / sizeof *data; ++i )
  223.    {
  224.       printf("+%lX ", (long unsigned)i);
  225.    }
  226.    puts("Text");
  227.    /*
  228.     * Body
  229.     */
  230.    do
  231.    {
  232.       /* Read some data. */
  233.       size = fread(data, sizeof *data, sizeof data / sizeof *data, file);
  234.       if ( size )
  235.       {
  236.          /* Print the base address. */
  237.          printf("%08lX ", (long unsigned)count);
  238.          count += size; /* adjust the base address */
  239.          /* Print the characters' hex values. */
  240.          for ( i = 0; i < size; ++i )
  241.          {
  242.             printf("%02X ", data[i]);
  243.          }
  244.          /* Pad the hex values area if necessary. */
  245.          for ( ++i; i <= sizeof data / sizeof *data; ++i )
  246.          {
  247.             fputs("   ", stdout);
  248.          }
  249.          /* Print the characters. */
  250.          for ( j = 0; j < size; j++ )
  251.          {
  252.             putchar(isprint(data[j]) ? data[j] : '.');
  253.          }
  254.          putchar('\n');
  255.       }
  256.    } while ( size == sizeof data / sizeof *data ); /* break on partial buffer */
  257.    return count;
  258. }
  259.  
  260. int main(void)
  261. {
  262.    static const char filename[] = __FILE__; /* may not work on everywhere */
  263.    FILE *file = fopen(filename, "rb");
  264.    if ( file != NULL )
  265.    {
  266.       printf("%lu bytes\n", (long unsigned)hexdump(file));
  267.       fclose(file);
  268.    }
  269.    else
  270.    {
  271.       perror(filename);
  272.    }
  273.    return 0;
  274. }
Comments (Newest First)
Dave Sinkula | long time no c | Apr 15th, 2007
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The beginning of the program source code is on line 211. Formatting changes have screwed up this snippet in a bad way.

It would be preferable to delete lines 3-210 entirely and move lines 1-2 to the description.
bumsfeld | Posting Shark | May 18th, 2006
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Nice program! Thank you much Dave!
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