Yes, making any assumption on the basic types in C is very dangerous for portability. That's why you should use typedef'd typed such as uint8_t and friends (def

Yes, making any assumption on the basic types in C is very dangerous for portability. That's why you should use typedef'd typed such as uint8_t and friends (defined in stdint.h in C99, but easy to roll your own) instead of 'char'. (except in cases where you don't care about the signedness or memory size)