hexdump.c

static void hexdump(unsigned char* buf, size_t len){
  int i;
  for(;;){
    fprintf(stderr, "    ");
    for (i = 0; i < 16; i++){
      if (len <= i){
	fprintf(stderr, "   ");
      } else{
	fprintf(stderr, "%02hhx ", buf[i]);
      }
    }
    for (i = 0; i < 16; i++){
      if (len <= i){
	fprintf(stderr, " ");
      } else if (buf[i] > ' ' && buf[i] < 127){
	fprintf(stderr, "%c", buf[i]);
      } else {
	fprintf(stderr, ".");
      }
    }
    fprintf(stderr, "\n");
    if (len < 16){
      break;
    }
    len-=16;
    buf+=16;
  }
}