Function AppendDecimal

src/brpc/redis_command.cpp:37–47

Much faster than snprintf(..., "%lu", d);

// Much faster than snprintf(..., "%lu", d);
inline size_t AppendDecimal(char* outbuf, unsigned long d) {
    char buf[24];  // enough for decimal 64-bit integers
    size_t n = sizeof(buf);
    do {
        const unsigned long q = d / 10;
        buf[--n] = d - q * 10 + '0';
        d = q;
    } while (d);
    fast_memcpy(outbuf, buf + n, sizeof(buf) - n);
    return sizeof(buf) - n;
}

// This function is the hotspot of RedisCommandFormatV() when format is
// short or does not have many %. In a 100K-time call to formating of