Function SplitVHostFromApp

src/brpc/rtmp.cpp:2782–2816

Split vhost from *app in forms of "APP?vhost=..." and overwrite *host.

// Split vhost from *app in forms of "APP?vhost=..." and overwrite *host.
static void SplitVHostFromApp(const butil::StringPiece& app_and_vhost,
                              butil::StringPiece* app,
                              butil::StringPiece* vhost) {
    const size_t q_pos = app_and_vhost.find('?');
    if (q_pos == butil::StringPiece::npos) {
        if (app) {
            *app = app_and_vhost;
        }
        if (vhost) {
            vhost->clear();
        }
        return;
    }
    
    if (app) {
        *app = app_and_vhost.substr(0, q_pos);
    }
    if (vhost) {
        butil::StringPiece qstr = app_and_vhost.substr(q_pos + 1);
        butil::StringSplitter sp(qstr.data(), qstr.data() + qstr.size(), '&');
        for (; sp; ++sp) {
            butil::StringPiece field(sp.field(), sp.length());
            if (field.starts_with("vhost=")) {
                *vhost = field.substr(6);
                // vhost cannot have port.
                const size_t colon_pos = vhost->find_last_of(':');
                if (colon_pos != butil::StringPiece::npos) {
                    vhost->remove_suffix(vhost->size() - colon_pos);
                }
                return;
            }
        }
        vhost->clear();
    }
}

void ParseRtmpURL(const butil::StringPiece& rtmp_url_in,
                  butil::StringPiece* host,