Realloc fail on union

Projects Programming
16

Before moving from short to long, I init() the buffer struct and Char * data is reset to nullptr:

MyString &  MyString::copy(const char *cstr, unsigned int length)
{
  if ( !bufferIsLongString() ) init();
  setLongShortStringFlag ( (length <= SHORT_STRING_CAPACTY) ? 0 : 1);
...

I can't figure why, but even if I try null to realloc, it fail on:

char * newbuffer = (char *)realloc(nullptr, maxStrLen + 1);
  if ( newbuffer == nullptr ) Serial.println (" allocation failed ");

anyway, Coding_Badly is right about the way I acces my data is wrong.

For what I read, it is probably cause by this. I will try to use an enum class instead of a inner flag to check the string length.