memchr, _fmemchr
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The memchr and _fmemchr functions look for the first occurrence of
<c> in the first <count> bytes of <buf>. They stop when they find
<c> or after checking the first <count> bytes.
The _fmemchr function is a model-independent (large model) form of
the memchr function and can be called from any point in any
program.
Return Value
If successful, memchr and _fmemchr return a pointer (or a far
pointer) to the first location of <c> in <buf>. Otherwise, they
return NULL.
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