get_param_from_http_request.cpp

template <size_t N>
const char* find_param(request* r, const char (&psz)[N]) {
    char name[N + 2] = "&";
    memcpy(name + 1, psz, N - 1);
    name[N] = '=';
    if (strncmp(r->query, name + 1, N)) {
        return strstr(r->query, name);
    } else {
        return args;
    }
}

// ...
const char* textStart = find_param(r, "text");
// ... check for NULL, find first '&' after textStart and do something useful