/* Provenance: curl/curl mqtt_send (fixed).
 * repo: curl/curl
 * commit: 43157490a5054bd24256fe12876931e8abc9df49
 * parent: 409a4412409371db00af0a3fe987e517bfab3d19
 * commit_url: https://github.com/curl/curl/commit/43157490a5054bd24256fe12876931e8abc9df49
 * cve: CVE-2021-22945
 * license: curl
 * function: mqtt_send
 * relpath: lib/mqtt.c
 * provenance: human
 * mechanism: other
 */

static CURLcode mqtt_send(struct Curl_easy *data,
                          char *buf, size_t len)
{
  CURLcode result = CURLE_OK;
  struct connectdata *conn = data->conn;
  curl_socket_t sockfd = conn->sock[FIRSTSOCKET];
  struct MQTT *mq = data->req.p.mqtt;
  ssize_t n;
  result = Curl_write(data, sockfd, buf, len, &n);
  if(!result)
    Curl_debug(data, CURLINFO_HEADER_OUT, buf, (size_t)n);
  if(len != (size_t)n) {
    size_t nsend = len - n;
    char *sendleftovers = Curl_memdup(&buf[n], nsend);
    if(!sendleftovers)
      return CURLE_OUT_OF_MEMORY;
    mq->sendleftovers = sendleftovers;
    mq->nsend = nsend;
  }
  else {
    mq->sendleftovers = NULL;
    mq->nsend = 0;
  }
  return result;
}