When should I use memcpy and when should I use memmove?

Question

Is there any important difference between the memcpy and the memmove functions? When should I use memcpy and when should I use memmove?

Answer 1

You should use memmove when there's a chance that the source and destination buffers overlap - it is specified to work in that case, whereas memcpy isn't.

In theory memcpy can be faster, if only because it doesn't check for overlapping memory buffers.