Function bf_set_ui

third-party/quickjs/src/quickjs/libbf.c:226–264

return 0 or BF_ST_MEM_ERROR */

/* return 0 or BF_ST_MEM_ERROR */
int bf_set_ui(bf_t *r, uint64_t a)
{
    r->sign = 0;
    if (a == 0) {
        r->expn = BF_EXP_ZERO;
        bf_resize(r, 0); /* cannot fail */
    } 
#if LIMB_BITS == 32
    else if (a <= 0xffffffff)
#else
    else
#endif
    {
        int shift;
        if (bf_resize(r, 1))
            goto fail;
        shift = clz(a);
        r->tab[0] = a << shift;
        r->expn = LIMB_BITS - shift;
    }
#if LIMB_BITS == 32
    else {
        uint32_t a1, a0;
        int shift;
        if (bf_resize(r, 2))
            goto fail;
        a0 = a;
        a1 = a >> 32;
        shift = clz(a1);
        r->tab[0] = a0 << shift;
        r->tab[1] = shld(a1, a0, shift);
        r->expn = 2 * LIMB_BITS - shift;
    }
#endif
    return 0;
 fail:
    bf_set_nan(r);
    return BF_ST_MEM_ERROR;
}

/* return 0 or BF_ST_MEM_ERROR */
int bf_set_si(bf_t *r, int64_t a)