Check for null return from malloc in C API

[larsmans]

I was bored and decided to do some C++ hacking. I caught you using malloc without testing its return value! :)

Also:

• no need for strlcpy, use memcpy instead
• don't cast the result from malloc, that hides bugs!
• sizeof(char) == 1 per definition in the C++ standard

[danieldk]

Thanks Lars! I'll look into it tomorrow.