memccpy, _fmemccpy
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The memccpy and _fmemccpy functions copy 0 or more bytes of <src>
to <dest>, halting when the character <c> has been copied or until
<count> bytes have been copied, whichever comes first.
The _fmemccpy function is a model-independent (large model) form
of the memccpy function and can be called from any point in any
program.
Return Value
If the character <c> is copied, memccpy and _fmemccpy return a
pointer (or far pointer) to the byte in <dest> that immediately
follows the character. If <c> is not copied, they return NULL.
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