text: #include "miscutil.h"
  
  void hexDump (char *desc, void *addr, int len) {
      int i;
      unsigned char buff[17];
      unsigned char *pc = (unsigned char*)addr;
  
      // Output description if given.
      if (desc != NULL)
          printf ("%s:\n", desc);
  
      if (len == 0) {
          printf("  ZERO LENGTH\n");
          return;
      }
      if (len < 0) {
          printf("  NEGATIVE LENGTH: %i\n",len);
          return;
      }
  
      // Process every byte in the data.
      for (i = 0; i < len; i++) {
          // Multiple of 16 means new line (with line offset).
  
          if ((i % 16) == 0) {
              // Just don't print ASCII for the zeroth line.
              if (i != 0)
                  printf ("  %s\n", buff);
  
              // Output the offset.
              printf ("  %04x ", i);
          }
  
          // Now the hex code for the specific character.
          printf (" %02x", pc[i]);
  
          // And store a printable ASCII character for later.
          if ((pc[i] < 0x20) || (pc[i] > 0x7e))
              buff[i % 16] = '.';
          else
              buff[i % 16] = pc[i];
          buff[(i % 16) + 1] = '\0';
      }
  
      // Pad out last line if not exactly 16 characters.
      while ((i % 16) != 0) {
          printf ("   ");
          i++;
      }
  
      // And print the final ASCII bit.
      printf ("  %s\n", buff);
  }
  
  /*
   * error - wrapper for perror
   */
  void error(char *msg) {
    perror(msg);
    exit(1);
  }