kernel/hexdump.c

   1 /*
   2  * The hex dump lib.
   3  *
   4  * Copyright (C) 2009 Liu Aleaxander -- All rights reserved. This file
   5  * may be redistributed under the terms of the GNU Public License.
   6  */
   7
   8 #include <stdio.h>
   9 #include <string.h>
  10
  11 void hexdump(const void *data, int len)
  12 {
  13         int i = 0;
  14         int index = 0;
  15         unsigned int base = 0;
  16         unsigned char *p = data;
  17         unsigned char hex[16 * 3 + 1] = {0, };
  18         unsigned char text[16 + 1] = {0, };
  19         unsigned char c;
  20
  21         for (i = 0; i < len; i++) {
  22                 index = i & 0xf;
  23                 if (i && index == 0) {
  24                         /* print the buffer before reset it */
  25                         printk("%08x  %-48s  |%-16s|\n", base, hex, text);
  26                         base += 0x10;
  27                         memset(hex, 0, sizeof hex);
  28                         memset(text, 0, sizeof text);
  29                 }
  30
  31                 c = *p++;
  32                 sprintk((char *)&hex[index * 3], "%02x ", c);
  33                 if (c < 0x20 || c > 0x7f)
  34                         text[index] = '.';
  35                 else
  36                         text[index] = c;
  37         }
  38
  39         /* print the last part */
  40         printk("%08x  %-48s  |%-16s|\n", base, hex, text);
  41 }