Ohhara's dumpcode - Linux kernel version.

dumpcode.c

#include <linux/kernel.h>

int isprintable(unsigned char c)
{
  if(0x20 <= c && 0x7E >=c)
    return 1;
  return 0;
}

void printchar(unsigned char c)
{
  if(isprintable(c))
    printk("%c",c);
  else
    printk(".");
}

void dumpcode(unsigned char *buff, int len)
{
  int i;
  printk("----------BEGIN DUMP----------\n");

  for(i=0;i<len;i++)
  {
    if(i%16==0)
      printk("0x%08X  ",(int)&buff[i]);
    
    printk("%02X ",buff[i]);

    if(i%16-15==0)
    {
      int j;
      printk("  ");
      for(j=i-15;j<=i;j++)
        printchar(buff[j]);

      printk("\n");
    }
  }

  if(i%16!=0)
  {
    int j;
    int spaces=(len-i+16-i%16)*3+2;
    for(j=0;j<spaces;j++)
      printk(" ");
    for(j=i-i%16;j<len;j++)
      printchar(buff[j]);
  }
  printk("\n");
  printk("---------END DUMP----------\n");
}

dumpcode.h

void dumpcode(unsigned char *buff, int len);