#include "project.h"

void
hexdump (void *_d, int len)
{
  uint8_t *d = (uint8_t *) _d;
  int i, j, k;
  int e;

  if (!d || len < 0)
    return;

  e = len + 15;
  e &= ~15;

  for (i = 0; i < e; i += 16) {
    usart1_drain();
    printf (" %05x:", i);

    for (j = 0; j < 16; ++j) {
      k = i + j;

      if (k < len)
        printf (" %02x", d[k]);
      else
        printf ("   ");

      if (j == 7)
        printf (" ");
    }

    printf (" ");

    for (j = 0; j < 16; ++j) {
      k = i + j;

      if (k < len) {
        uint8_t c = d[k];

        if (c < 33)
          c = '.';

        if (c > 126)
          c = '.';

        printf ("%c", c);
      }

      if (j == 7)
        printf (" ");
    }

    printf ("\r\n");
  }

  usart1_drain();
}