Design question dealing with char* function

My question is about if I should return char* or have a char* as an
argument. My basic premise for this function is to return a char*
buffer and the size of the buffer to the caller. I know that each of
the following works but Stylistic which would be the better approach.

Here are my two examples:

char* GetBuffer(long* size);

or


void GetBuffer(char* buff, long* size);


Thanks


Danny

.

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