Function increment_overflow_time

src/date.cpp:467–479

    }

    static int increment_overflow_time(time_t *tp, int_fast32_t j) {		// #nocov start
        /*
        ** This is like
        ** 'if (! (time_t_min <= *tp + j && *tp + j <= time_t_max)) ...',
        ** except that it does the right thing even if *tp + j would overflow.
        */
        if (! (j < 0
               ? (TYPE_SIGNED(time_t) ? time_t_min - j <= *tp : -1 - j < *tp)
               : *tp <= time_t_max - j))
            return TRUE;
        *tp += j;
        return FALSE;
    }

    static int_fast32_t detzcode(const char *const codep) {
        int_fast32_t result = (codep[0] & 0x80) ? -1 : 0;