Copy "len" bytes from "src" to "op", one byte at a time. Used for handling COPY operations where the input and output regions may overlap. For example, suppose: src == "ab" op == src + 2 len == 20 After IncrementalCopy(src, op, len), the result will have eleven copies of "ab" ababababababababababab Note that this does not match the semantics of either memcpy() or memmove().
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