static_noinline void bigint_set_buf()

in include/yyjson/yyjson.c [4231:4280]

• 42 lines of code
• 9 McCabe index (conditional complexity)

static_noinline void bigint_set_buf(bigint *big, u64 sig, i32 *exp,
                                    u8 *sig_cut, u8 *sig_end, u8 *dot_pos) {
    
    if (unlikely(!sig_cut)) {
        /* no digit cut, set significant part only */
        bigint_set_u64(big, sig);
        return;
        
    } else {
        /* some digits were cut, read them from 'sig_cut' to 'sig_end' */
        u8 *hdr = sig_cut;
        u8 *cur = hdr;
        u32 len = 0;
        u64 val = 0;
        bool dig_big_cut = false;
        bool has_dot = (hdr < dot_pos) & (dot_pos < sig_end);
        u32 dig_len_total = U64_SAFE_DIG + (u32)(sig_end - hdr) - has_dot;
        
        sig -= (*sig_cut >= '5'); /* sig was rounded before */
        if (dig_len_total > F64_MAX_DEC_DIG) {
            dig_big_cut = true;
            sig_end -= dig_len_total - (F64_MAX_DEC_DIG + 1);
            sig_end -= (dot_pos + 1 == sig_end);
            dig_len_total = (F64_MAX_DEC_DIG + 1);
        }
        *exp -= (i32)dig_len_total - U64_SAFE_DIG;
        
        big->used = 1;
        big->bits[0] = sig;
        while (cur < sig_end) {
            if (likely(cur != dot_pos)) {
                val = val * 10 + (u8)(*cur++ - '0');
                len++;
                if (unlikely(cur == sig_end && dig_big_cut)) {
                    /* The last digit must be non-zero,    */
                    /* set it to '1' for correct rounding. */
                    val = val - (val % 10) + 1;
                }
                if (len == U64_SAFE_DIG || cur == sig_end) {
                    bigint_mul_pow10(big, (i32)len);
                    bigint_add_u64(big, val);
                    val = 0;
                    len = 0;
                }
            } else {
                cur++;
            }
        }
    }
}