About comparing a record's key with input key

[duclahoang]

Hi, everyone
I've read source code kyotocabinet-1.2.79 recently, and there is a piece of code (at line 1936 file kcdirdb.h) that I can't clearly understand.

bool accept_impl(const char* kbuf, size_t ksiz, Visitor* visitor, const char* name) {
    _assert_(kbuf && ksiz <= MEMMAXSIZ && visitor && name);
    bool err = false;
    const std::string& rpath = path_ + File::PATHCHR + name;
    Record rec;
    if (read_record(rpath, &rec)) {
      if (rec.ksiz == ksiz || !std::memcmp(rec.kbuf, kbuf, ksiz)) {
        if (!accept_visit_full(kbuf, ksiz, rec.vbuf, rec.vsiz, rec.rsiz,
                               visitor, rpath, name)) err = true;
      } else {
        set_error(_KCCODELINE_, Error::LOGIC, "collision of the hash values");
        err = true;
      }
      delete[] rec.rbuf;
    } else {
      if (!accept_visit_empty(kbuf, ksiz, visitor, rpath, name)) err = true;
    }
    return !err;
  }

The code that compares input key with record's key: rec.ksiz == ksiz || !std::memcmp(rec.kbuf, kbuf, ksiz)
I think it must be something looks like: rec.ksiz == ksiz && !std::memcmp(rec.kbuf, kbuf, ksiz).
Thank you for reading my issue.