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A code pattern `p + enclen(enc, p, pend)` may lead to a buffer overrun if incomplete bytes of a UTF-8 character is placed at the end of a string. Because this pattern is used in several places in onigmo, this change fixes the issue in the side of `enclen`: the function should not return a number that is larger than `pend - p`. Co-Authored-By: Nobuyoshi Nakada <nobu@ruby-lang.org>