Fix overlapping memcpy #2344
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Fix overlapping memcpy #2344
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It's UB to use memcpy with overlapping source and destination. This might be causing crashes on 32 bit platforms and on OpenBSD. Use memmove instead. Add a bounds check while we're at it since it's unclear whether one-past-end pointer with n=0 is UB.
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It's UB to use memcpy with overlapping source and destination. This
might be causing crashes on 32 bit platforms and on OpenBSD. Use memmove
instead. Add a bounds check while we're at it since it's unclear whether
one-past-end pointer with n=0 is UB.