4 ms·

if dst and src in memcpy overlap, the result is UB. so there's your window of opportunity. well, you asked...

• mort96 4y ago
  Haha, you're right, it's technically allowed for memcpy to call malloc in that circumstance.
  • Tor3 4y ago
    memcpy wouldn't, but memmove would. memcpy doesn't check for or care about overlaps (and therefore the result is unpredictable - it'll depend on the implementation)