Library /sys$common/syshlp/helplib.hlb  —  CRTL  snprintf  Return Values
    x                  The number of bytes (excluding the terminating
                       null byte) that would be written to str if n
                       is sufficiently large.
    Negative value     Indicates an output error occurred. The
                       function sets errno. For a list of errno
                       values set by this function, see fprintf.
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