Library /sys$common/syshlp/helplib.hlb  —  CRTL  strncmp  Description
    The strncmp function compares no more than maxchar characters
    from the string pointed to by str_1 to the string pointed
    to by str_2. The strings are compared until a null character
    is encountered, the strings differ, or maxchar is reached.
    Characters that follow a difference or a null character are not
    compared.
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