Function strcpy_insitu

Tools/EditorFramework/pugixml.cpp:1717–1764

}

PUGI__FN bool strcpy_insitu(char_t*& dest, uintptr_t& header, uintptr_t header_mask, const char_t* source)
{
	size_t source_length = strlength(source);

	if (source_length == 0)
	{
		// empty string and null pointer are equivalent, so just deallocate old memory
		xml_allocator* alloc = reinterpret_cast<xml_memory_page*>(header & xml_memory_page_pointer_mask)->allocator;

		if (header & header_mask)
			alloc->deallocate_string(dest);

		// mark the string as not allocated
		dest = 0;
		header &= ~header_mask;

		return true;
	}
	else if (dest && strcpy_insitu_allow(source_length, header & header_mask, dest))
	{
		// we can reuse old buffer, so just copy the new data (including zero terminator)
		memcpy(dest, source, (source_length + 1) * sizeof(char_t));

		return true;
	}
	else
	{
		xml_allocator* alloc = reinterpret_cast<xml_memory_page*>(header & xml_memory_page_pointer_mask)->allocator;

		// allocate new buffer
		char_t* buf = alloc->allocate_string(source_length + 1);
		if (!buf)
			return false;

		// copy the string (including zero terminator)
		memcpy(buf, source, (source_length + 1) * sizeof(char_t));

		// deallocate old buffer (*after* the above to protect against overlapping memory and/or allocation failures)
		if (header & header_mask)
			alloc->deallocate_string(dest);

		// the string is now allocated, so set the flag
		dest = buf;
		header |= header_mask;

		return true;
	}
}

struct gap
{