• C

C: memcpy() and memmove()


In C:

From what I understand, memcpy() cannot be used to copy between overlapping buffers and memmove() can. So my question is, if I don't care about effiency, can I use memmove() to copy between NON-OVERLAPPING buffers?

Reason I ask is I encountered this function in some existing code that I'm enhancing, and I'd rather not have to change all of the calls. In the existintg code memmove() is used to copy between non-overlaping buffers.

Stephen KairysTechnical Writer - ConsultantAsked:
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Yes, you can use memmove in both cases.

It is (immeasurably) slower because it has to check whether the ranges overlap before doing the copy.

Stephen KairysTechnical Writer - ConsultantAuthor Commented:
OK thanks for the help.
Stephen KairysTechnical Writer - ConsultantAuthor Commented:
Thanks again. I was dealing with a weird bug that I thought might be caused by using memmove() when I shoudln't but turns out there was another cause that had nothing to do with that function call. And your comment confirmed this for me. Thanks.
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