Method upper

src/common/classes/fb_string.cpp:338–347

#endif // WIN_NT

	void AbstractString::upper()
	{
#ifdef WIN_NT
		CharUpperBuffA(modify(), length());
#else  // WIN_NT
		for (pointer p = modify(); *p; p++) {
			*p = toupper(*p);
		}
#endif // WIN_NT
	}

	void AbstractString::lower()
	{