Convert hexadecimal to a string

Hex2Str.c

char *Hex2Str(uint8_t *addr, size_t len, char *out_str, size_t out_str_len,
              bool from_end) {
  if (addr == NULL || len == 0 || out_str == NULL || out_str_len < 3)
    return out_str;
  len = len < (out_str_len-1) / 2 ? len : (out_str_len-1) / 2;

  char hex[] = "0123456789ABCDEF";
  char *str = out_str;

  if (from_end) {
    for (addr += len; len > 0; len--) {
      *str++ = hex[*--addr >> 4u];
      *str++ = hex[*addr & 0x0Fu];
    }
  } else {
    for (; len > 0; len--) {
      *str++ = hex[*addr >> 4u];
      *str++ = hex[*addr++ & 0x0Fu];
    }
  }
  *str = '\0';

  return out_str;
}