conky/src/libmpdclient.cc

/*
 *
 * libmpdclient
 * (c)2003-2006 by Warren Dukes (warren.dukes@gmail.com)
 * This project's homepage is: http://www.musicpd.org
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - Redistributions in binary form must reproduce the above copyright
 * notice, this list of conditions and the following disclaimer in the
 * documentation and/or other materials provided with the distribution.
 *
 * - Neither the name of the Music Player Daemon nor the names of its
 * contributors may be used to endorse or promote products derived from
 * this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 */

#include "libmpdclient.h"
#include "conky.h"

#include <fcntl.h>
#include <sys/param.h>
#include <sys/types.h>
#include <unistd.h>
#include <cctype>
#include <cerrno>
#include <climits>

#ifdef WIN32
#include <winsock.h>
#include <ws2tcpip.h>
#else
#include <arpa/inet.h>
#include <netdb.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/un.h>
#endif

#ifndef SUN_LEN
#define SUN_LEN(a) sizeof(a)
#endif

#ifndef SOCK_CLOEXEC
#define SOCK_CLOEXEC O_CLOEXEC
#endif /* SOCK_CLOEXEC */

/* (bits + 1) / 3 (plus the sign character) */
#define INTLEN ((sizeof(int) * CHAR_BIT + 1) / 3 + 1)
#define LONGLONGLEN ((sizeof(long long) * CHAR_BIT + 1) / 3 + 1)

#define COMMAND_LIST 1
#define COMMAND_LIST_OK 2

#ifndef MPD_NO_GAI
#ifdef AI_ADDRCONFIG
#define MPD_HAVE_GAI
#endif
#endif

#ifndef MSG_DONTWAIT
#define MSG_DONTWAIT 0
#endif

#ifdef WIN32
#define SELECT_ERRNO_IGNORE (errno == WSAEINTR || errno == WSAEINPROGRESS)
#define SENDRECV_ERRNO_IGNORE SELECT_ERRNO_IGNORE
#else
#define SELECT_ERRNO_IGNORE (errno == EINTR)
#define SENDRECV_ERRNO_IGNORE (errno == EINTR || errno == EAGAIN)
#define winsock_dll_error(c) 0
#define closesocket(s) close(s)
#define WSACleanup() \
  do { /* nothing */ \
  } while (0)
#endif

#ifdef WIN32
static int winsock_dll_error(mpd_Connection *connection) {
  WSADATA wsaData;

  if ((WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0 ||
      LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
    strncpy(connection->errorStr, "Could not find usable WinSock DLL.",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = MPD_ERROR_SYSTEM;
    return 1;
  }
  return 0;
}

static int do_connect_fail(mpd_Connection *connection,
                           const struct sockaddr *serv_addr, int addrlen) {
  int iMode = 1; /* 0 = blocking, else non-blocking */

  ioctlsocket(connection->sock, FIONBIO, (u_long FAR *)&iMode);
  return (connect(connection->sock, serv_addr, addrlen) == SOCKET_ERROR &&
          WSAGetLastError() != WSAEWOULDBLOCK);
}
#else  /* !WIN32 (sane operating systems) */
static int do_connect_fail(mpd_Connection *connection,
                           const struct sockaddr *serv_addr, int addrlen) {
  int flags = fcntl(connection->sock, F_GETFL, 0);

  fcntl(connection->sock, F_SETFL, flags | O_NONBLOCK);
  return static_cast<int>(connect(connection->sock, serv_addr, addrlen) < 0 &&
                          errno != EINPROGRESS);
}
#endif /* !WIN32 */

static int uds_connect(mpd_Connection *connection, const char *host,
                       float timeout) {
  struct sockaddr_un addr {};

  strncpy(addr.sun_path, host, sizeof(addr.sun_path) - 1);
  addr.sun_family = AF_UNIX;
  addr.sun_path[sizeof(addr.sun_path) - 1] = 0;
  connection->sock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);

  if (connection->sock < 0) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "problems creating socket: %s", strerror(errno));
    connection->error = MPD_ERROR_SYSTEM;
    return -1;
  }

  mpd_setConnectionTimeout(connection, timeout);

  /* connect stuff */
  if (do_connect_fail(connection, reinterpret_cast<struct sockaddr *>(&addr),
                      SUN_LEN(&addr)) != 0) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "problems connecting socket: %s", strerror(errno));
    closesocket(connection->sock);
    connection->sock = -1;
    connection->error = MPD_ERROR_SYSTEM;
    return -1;
  }

  return 0;
}

#ifdef MPD_HAVE_GAI
static int mpd_connect(mpd_Connection *connection, const char *host, int port,
                       float timeout) {
  int error;
  char service[INTLEN + 1];
  struct addrinfo hints {};
  struct addrinfo *res = nullptr;
  struct addrinfo *addrinfo = nullptr;

  if (*host == '/') { return uds_connect(connection, host, timeout); }

  /* Setup hints */
  hints.ai_flags = AI_ADDRCONFIG;
  hints.ai_family = AF_UNSPEC;
  hints.ai_socktype = SOCK_STREAM;
  hints.ai_protocol = IPPROTO_TCP;
  hints.ai_addrlen = 0;
  hints.ai_addr = nullptr;
  hints.ai_canonname = nullptr;
  hints.ai_next = nullptr;

  snprintf(service, sizeof(service), "%i", port);

  error = getaddrinfo(host, service, &hints, &addrinfo);

  if (error != 0) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "host \"%s\" not found: %s", host, gai_strerror(error));
    connection->error = MPD_ERROR_UNKHOST;
    return -1;
  }

  for (res = addrinfo; res != nullptr; res = res->ai_next) {
    /* create socket */
    if (connection->sock > -1) { closesocket(connection->sock); }
    connection->sock =
        socket(res->ai_family, SOCK_STREAM | SOCK_CLOEXEC, res->ai_protocol);
    if (connection->sock < 0) {
      snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
               "problems creating socket: %s", strerror(errno));
      connection->error = MPD_ERROR_SYSTEM;
      freeaddrinfo(addrinfo);
      return -1;
    }

    mpd_setConnectionTimeout(connection, timeout);

    /* connect stuff */
    if (do_connect_fail(connection, res->ai_addr, res->ai_addrlen) != 0) {
      /* try the next address family */
      closesocket(connection->sock);
      connection->sock = -1;
      continue;
    }
  }

  freeaddrinfo(addrinfo);

  if (connection->sock < 0) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "problems connecting to \"%s\" on port %i: %s", host, port,
             strerror(errno));
    connection->error = MPD_ERROR_CONNPORT;

    return -1;
  }

  return 0;
}
#else /* !MPD_HAVE_GAI */
static int mpd_connect(mpd_Connection *connection, const char *host, int port,
                       float timeout) {
  struct hostent he, *he_res = 0;
  int he_errno;
  char hostbuff[2048];
  struct sockaddr *dest;
  int destlen;
  struct sockaddr_in sin;

  if (*host == '/') return uds_connect(connection, host, timeout);

#ifdef HAVE_GETHOSTBYNAME_R
  if (gethostbyname_r(host, &he, hostbuff, sizeof(hostbuff), &he_res,
                      &he_errno)) {  // get the host info
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH, "%s ('%s')",
             hstrerror(h_errno), host);
    connection->error = MPD_ERROR_UNKHOST;
    return -1;
  }
#else  /* HAVE_GETHOSTBYNAME_R */
  if (!(he_res = gethostbyname(host))) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "host \"%s\" not found", host);
    connection->error = MPD_ERROR_UNKHOST;
    return -1;
  }
#endif /* HAVE_GETHOSTBYNAME_R */

  memset(&sin, 0, sizeof(struct sockaddr_in));
  /* dest.sin_family = he_res->h_addrtype; */
  sin.sin_family = AF_INET;
  sin.sin_port = htons(port);

  switch (he_res->h_addrtype) {
    case AF_INET:
      memcpy((char *)&sin.sin_addr.s_addr, (char *)he_res->h_addr,
             he_res->h_length);
      dest = (struct sockaddr *)&sin;
      destlen = sizeof(struct sockaddr_in);
      break;
    default:
      strncpy(connection->errorStr, "address type is not IPv4",
              MPD_ERRORSTR_MAX_LENGTH);
      connection->error = MPD_ERROR_SYSTEM;
      return -1;
      break;
  }

  if (connection->sock > -1) { closesocket(connection->sock); }
  if ((connection->sock = socket(dest->sa_family, SOCK_STREAM, 0)) < 0) {
    strncpy(connection->errorStr, "problems creating socket",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = MPD_ERROR_SYSTEM;
    return -1;
  }

  mpd_setConnectionTimeout(connection, timeout);

  /* connect stuff */
  if (do_connect_fail(connection, dest, destlen)) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "problems connecting to \"%s\" on port %i", host, port);
    connection->error = MPD_ERROR_CONNPORT;
    return -1;
  }

  return 0;
}
#endif /* !MPD_HAVE_GAI */

const char *mpdTagItemKeys[MPD_TAG_NUM_OF_ITEM_TYPES] = {
    "Artist",   "Album",     "Title",   "Track", "Name",     "Genre", "Date",
    "Composer", "Performer", "Comment", "Disc",  "Filename", "Any"};

static char *mpd_sanitizeArg(const char *arg) {
  size_t i;
  char *ret;
  const char *c;
  char *rc;

  /* instead of counting in that loop above,
   * just use a bit more memory and halve running time */
  ret = static_cast<char *>(malloc(strlen(arg) * 2 + 1));

  c = arg;
  rc = ret;
  for (i = strlen(arg) + 1; i != 0; --i) {
    if (*c == '"' || *c == '\\') { *rc++ = '\\'; }
    *(rc++) = *(c++);
  }

  return ret;
}

static mpd_ReturnElement *mpd_newReturnElement(const char *name,
                                               const char *value) {
  auto *ret =
      static_cast<mpd_ReturnElement *>(malloc(sizeof(mpd_ReturnElement)));

  ret->name = strndup(name, text_buffer_size.get(*state));
  ret->value = strndup(value, text_buffer_size.get(*state));

  return ret;
}

static void mpd_freeReturnElement(mpd_ReturnElement *re) {
  free(re->name);
  free(re->value);
  free(re);
}

void mpd_setConnectionTimeout(mpd_Connection *connection, float timeout) {
  connection->timeout.tv_sec = static_cast<int>(timeout);
  connection->timeout.tv_usec =
      static_cast<int>((timeout - connection->timeout.tv_sec) * 1e6 + 0.5);
}

static int mpd_parseWelcome(mpd_Connection *connection, const char *host,
                            int port, /* char *rt, */ char *output) {
  char *tmp;
  char *test;
  int i;

  if (static_cast<int>(strncmp(output, MPD_WELCOME_MESSAGE,
                               strlen(MPD_WELCOME_MESSAGE)) != 0) != 0) {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "mpd not running on port %i on host \"%s\"", port, host);
    connection->error = MPD_ERROR_NOTMPD;
    return 1;
  }

  tmp = &output[strlen(MPD_WELCOME_MESSAGE)];

  for (i = 0; i < 3; i++) {
    if (tmp != nullptr) { connection->version[i] = strtol(tmp, &test, 10); }

    if ((tmp == nullptr) || (test[0] != '.' && test[0] != '\0')) {
      snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
               "error parsing version number at \"%s\"",
               &output[strlen(MPD_WELCOME_MESSAGE)]);
      connection->error = MPD_ERROR_NOTMPD;
      return 1;
    }
    tmp = ++test;
  }

  return 0;
}

mpd_Connection *mpd_newConnection(const char *host, int port, float timeout) {
  int err;
  char *rt;
  char *output = nullptr;
  auto *connection =
      static_cast<mpd_Connection *>(malloc(sizeof(mpd_Connection)));
  struct timeval tv {};
  fd_set fds;

  strncpy(connection->buffer, "", 1);
  connection->buflen = 0;
  connection->bufstart = 0;
  strncpy(connection->errorStr, "", MPD_ERRORSTR_MAX_LENGTH);
  connection->error = 0;
  connection->doneProcessing = 0;
  connection->commandList = 0;
  connection->listOks = 0;
  connection->doneListOk = 0;
  connection->sock = -1;
  connection->returnElement = nullptr;
  connection->request = nullptr;

  if (winsock_dll_error(connection)) { return connection; }

  if (mpd_connect(connection, host, port, timeout) < 0) { return connection; }

  while ((rt = strstr(connection->buffer, "\n")) == nullptr) {
    tv.tv_sec = connection->timeout.tv_sec;
    tv.tv_usec = connection->timeout.tv_usec;
    FD_ZERO(&fds);
    FD_SET(connection->sock, &fds);
    if ((err = select(connection->sock + 1, &fds, nullptr, nullptr, &tv)) ==
        1) {
      int readed;

      readed = recv(connection->sock, &(connection->buffer[connection->buflen]),
                    MPD_BUFFER_MAX_LENGTH - connection->buflen, 0);
      if (readed <= 0) {
        snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
                 "problems getting a response from \"%s\" on port %i : %s",
                 host, port, strerror(errno));
        connection->error = MPD_ERROR_NORESPONSE;
        return connection;
      }
      connection->buflen += readed;
      connection->buffer[connection->buflen] = '\0';
    } else if (err < 0) {
      if
        SELECT_ERRNO_IGNORE { continue; }
      snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
               "problems connecting to \"%s\" on port %i", host, port);
      connection->error = MPD_ERROR_CONNPORT;
      return connection;
    } else {
      snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
               "timeout in attempting to get a response from \"%s\" on "
               "port %i",
               host, port);
      connection->error = MPD_ERROR_NORESPONSE;
      return connection;
    }
  }

  *rt = '\0';
  output = strndup(connection->buffer, text_buffer_size.get(*state));
  strncpy(connection->buffer, rt + 1, MPD_BUFFER_MAX_LENGTH);
  connection->buflen = strlen(connection->buffer);

  if (mpd_parseWelcome(connection, host, port, /* rt, */ output) == 0) {
    connection->doneProcessing = 1;
  }

  free(output);

  return connection;
}

void mpd_clearError(mpd_Connection *connection) {
  connection->error = 0;
  connection->errorStr[0] = '\0';
}

void mpd_closeConnection(mpd_Connection *connection) {
  if (connection != nullptr) {
    closesocket(connection->sock);
    free_and_zero(connection->returnElement);
    free_and_zero(connection->request);
    free(connection);
  }
  WSACleanup();
}

static void mpd_executeCommand(mpd_Connection *connection,
                               const char *command) {
  int ret;
  struct timeval tv {};
  fd_set fds;
  const char *commandPtr = command;
  int commandLen = strlen(command);

  if ((connection->doneProcessing == 0) && (connection->commandList == 0)) {
    strncpy(connection->errorStr, "not done processing current command",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  mpd_clearError(connection);

  FD_ZERO(&fds);
  FD_SET(connection->sock, &fds);
  tv.tv_sec = connection->timeout.tv_sec;
  tv.tv_usec = connection->timeout.tv_usec;

  do {
    ret = static_cast<int>(
        select(connection->sock + 1, nullptr, &fds, nullptr, &tv));
    if (ret != 1 && !SELECT_ERRNO_IGNORE) { break; }
    ret = send(connection->sock, commandPtr, commandLen, MSG_DONTWAIT);
    if (ret <= 0) {
      if
        SENDRECV_ERRNO_IGNORE { continue; }
      snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
               "problems giving command \"%s\"", command);
      connection->error = MPD_ERROR_SENDING;
      return;
    }
    commandPtr += ret;
    commandLen -= ret;
  } while (commandLen > 0);

  if (commandLen > 0) {
    perror("");
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "timeout sending command \"%s\"", command);
    connection->error = MPD_ERROR_TIMEOUT;
    return;
  }

  if (connection->commandList == 0) {
    connection->doneProcessing = 0;
  } else if (connection->commandList == COMMAND_LIST_OK) {
    connection->listOks++;
  }
}

static void mpd_getNextReturnElement(mpd_Connection *connection) {
  char *output = nullptr;
  char *rt = nullptr;
  char *name = nullptr;
  char *value = nullptr;
  fd_set fds;
  struct timeval tv {};
  char *tok = nullptr;
  int readed;
  char *bufferCheck = nullptr;
  int err;
  int pos;

  if (connection->returnElement != nullptr) {
    mpd_freeReturnElement(connection->returnElement);
  }
  connection->returnElement = nullptr;

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    strncpy(connection->errorStr, "already done processing current command",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  bufferCheck = connection->buffer + connection->bufstart;
  while (connection->bufstart >= connection->buflen ||
         ((rt = strchr(bufferCheck, '\n')) == nullptr)) {
    if (connection->buflen >= MPD_BUFFER_MAX_LENGTH) {
      memmove(connection->buffer, connection->buffer + connection->bufstart,
              connection->buflen - connection->bufstart + 1);
      connection->buflen -= connection->bufstart;
      connection->bufstart = 0;
    }
    if (connection->buflen >= MPD_BUFFER_MAX_LENGTH) {
      strncpy(connection->errorStr, "buffer overrun", MPD_ERRORSTR_MAX_LENGTH);
      connection->error = MPD_ERROR_BUFFEROVERRUN;
      connection->doneProcessing = 1;
      connection->doneListOk = 0;
      return;
    }
    bufferCheck = connection->buffer + connection->buflen;
    tv.tv_sec = connection->timeout.tv_sec;
    tv.tv_usec = connection->timeout.tv_usec;
    FD_ZERO(&fds);
    FD_SET(connection->sock, &fds);
    if ((err = static_cast<int>(select(connection->sock + 1, &fds, nullptr,
                                       nullptr, &tv) == 1)) != 0) {
      readed = recv(connection->sock, connection->buffer + connection->buflen,
                    MPD_BUFFER_MAX_LENGTH - connection->buflen, MSG_DONTWAIT);
      if (readed < 0 && SENDRECV_ERRNO_IGNORE) { continue; }
      if (readed <= 0) {
        strncpy(connection->errorStr, "connection closed",
                MPD_ERRORSTR_MAX_LENGTH);
        connection->error = MPD_ERROR_CONNCLOSED;
        connection->doneProcessing = 1;
        connection->doneListOk = 0;
        return;
      }
      connection->buflen += readed;
      connection->buffer[connection->buflen] = '\0';
    } else {
      strncpy(connection->errorStr, "connection timeout",
              MPD_ERRORSTR_MAX_LENGTH);
      connection->error = MPD_ERROR_TIMEOUT;
      connection->doneProcessing = 1;
      connection->doneListOk = 0;
      return;
    }
  }

  *rt = '\0';
  output = connection->buffer + connection->bufstart;
  connection->bufstart = rt - connection->buffer + 1;

  if (strcmp(output, "OK") == 0) {
    if (connection->listOks > 0) {
      strncpy(connection->errorStr, "expected more list_OK's",
              MPD_ERRORSTR_MAX_LENGTH);
      connection->error = 1;
    }
    connection->listOks = 0;
    connection->doneProcessing = 1;
    connection->doneListOk = 0;
    return;
  }

  if (strcmp(output, "list_OK") == 0) {
    if (connection->listOks == 0) {
      strncpy(connection->errorStr, "got an unexpected list_OK",
              MPD_ERRORSTR_MAX_LENGTH);
      connection->error = 1;
    } else {
      connection->doneListOk = 1;
      connection->listOks--;
    }
    return;
  }

  if (strncmp(output, "ACK", strlen("ACK")) == 0) {
    char *test;
    char *needle;
    int val;

    strncpy(connection->errorStr, output, MPD_ERRORSTR_MAX_LENGTH);
    connection->error = MPD_ERROR_ACK;
    connection->errorCode = MPD_ACK_ERROR_UNK;
    connection->errorAt = MPD_ERROR_AT_UNK;
    connection->doneProcessing = 1;
    connection->doneListOk = 0;

    needle = strchr(output, '[');
    if (needle == nullptr) { return; }
    val = strtol(needle + 1, &test, 10);
    if (*test != '@') { return; }
    connection->errorCode = val;
    val = strtol(test + 1, &test, 10);
    if (*test != ']') { return; }
    connection->errorAt = val;
    return;
  }

  tok = strchr(output, ':');
  if (tok == nullptr) { return; }
  pos = tok - output;
  value = ++tok;
  name = output;
  name[pos] = '\0';

  if (value[0] == ' ') {
    connection->returnElement = mpd_newReturnElement(name, &(value[1]));
  } else {
    snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
             "error parsing: %s:%s", name, value);
    connection->error = 1;
  }
}

void mpd_finishCommand(mpd_Connection *connection) {
  while ((connection != nullptr) && (connection->doneProcessing == 0)) {
    if (connection->doneListOk != 0) { connection->doneListOk = 0; }
    mpd_getNextReturnElement(connection);
  }
}

static void mpd_finishListOkCommand(mpd_Connection *connection) {
  while ((connection->doneProcessing == 0) && (connection->listOks != 0) &&
         (connection->doneListOk == 0)) {
    mpd_getNextReturnElement(connection);
  }
}

int mpd_nextListOkCommand(mpd_Connection *connection) {
  mpd_finishListOkCommand(connection);
  if (connection->doneProcessing == 0) { connection->doneListOk = 0; }
  if (connection->listOks == 0 || (connection->doneProcessing != 0)) {
    return -1;
  }
  return 0;
}

void mpd_sendStatusCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "status\n");
}

mpd_Status *mpd_getStatus(mpd_Connection *connection) {
  mpd_Status *status;

  /* mpd_executeCommand(connection, "status\n");
     if (connection->error) {
     return nullptr;
     } */

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  if (connection->returnElement == nullptr) {
    mpd_getNextReturnElement(connection);
  }

  status = static_cast<mpd_Status *>(malloc(sizeof(mpd_Status)));
  status->volume = -1;
  status->repeat = 0;
  status->random = 0;
  status->playlist = -1;
  status->playlistLength = -1;
  status->state = -1;
  status->song = 0;
  status->songid = 0;
  status->elapsedTime = 0;
  status->totalTime = 0;
  status->bitRate = 0;
  status->sampleRate = 0;
  status->bits = 0;
  status->channels = 0;
  status->crossfade = -1;
  status->error = nullptr;
  status->updatingDb = 0;

  if (connection->error != 0) {
    free(status);
    return nullptr;
  }
  while (connection->returnElement != nullptr) {
    mpd_ReturnElement *re = connection->returnElement;

    if (strcmp(re->name, "volume") == 0) {
      status->volume = atoi(re->value);
    } else if (strcmp(re->name, "repeat") == 0) {
      status->repeat = atoi(re->value);
    } else if (strcmp(re->name, "random") == 0) {
      status->random = atoi(re->value);
    } else if (strcmp(re->name, "playlist") == 0) {
      status->playlist = strtol(re->value, nullptr, 10);
    } else if (strcmp(re->name, "playlistlength") == 0) {
      status->playlistLength = atoi(re->value);
    } else if (strcmp(re->name, "bitrate") == 0) {
      status->bitRate = atoi(re->value);
    } else if (strcmp(re->name, "state") == 0) {
      if (strcmp(re->value, "play") == 0) {
        status->state = MPD_STATUS_STATE_PLAY;
      } else if (strcmp(re->value, "stop") == 0) {
        status->state = MPD_STATUS_STATE_STOP;
      } else if (strcmp(re->value, "pause") == 0) {
        status->state = MPD_STATUS_STATE_PAUSE;
      } else {
        status->state = MPD_STATUS_STATE_UNKNOWN;
      }
    } else if (strcmp(re->name, "song") == 0) {
      status->song = atoi(re->value);
    } else if (strcmp(re->name, "songid") == 0) {
      status->songid = atoi(re->value);
    } else if (strcmp(re->name, "time") == 0) {
      char *tok = strchr(re->value, ':');

      /* the second strchr below is a safety check */
      if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
        /* atoi stops at the first non-[0-9] char: */
        status->elapsedTime = atoi(re->value);
        status->totalTime = atoi(tok + 1);
      }
    } else if (strcmp(re->name, "error") == 0) {
      status->error = strndup(re->value, text_buffer_size.get(*state));
    } else if (strcmp(re->name, "xfade") == 0) {
      status->crossfade = atoi(re->value);
    } else if (strcmp(re->name, "updating_db") == 0) {
      status->updatingDb = atoi(re->value);
    } else if (strcmp(re->name, "audio") == 0) {
      char *tok = strchr(re->value, ':');

      if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
        status->sampleRate = atoi(re->value);
        status->bits = atoi(++tok);
        tok = strchr(tok, ':');
        if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
          status->channels = atoi(tok + 1);
        }
      }
    }

    mpd_getNextReturnElement(connection);
    if (connection->error != 0) {
      free(status);
      return nullptr;
    }
  }

  if (connection->error != 0) {
    free(status);
    return nullptr;
  }
  if (status->state < 0) {
    strncpy(connection->errorStr, "state not found", MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    free(status);
    return nullptr;
  }

  return status;
}

void mpd_freeStatus(mpd_Status *status) {
  free_and_zero(status->error);
  free(status);
}

void mpd_sendStatsCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "stats\n");
}

mpd_Stats *mpd_getStats(mpd_Connection *connection) {
  mpd_Stats *stats;

  /* mpd_executeCommand(connection, "stats\n");
     if (connection->error) {
     return nullptr;
     } */

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  if (connection->returnElement == nullptr) {
    mpd_getNextReturnElement(connection);
  }

  stats = static_cast<mpd_Stats *>(malloc(sizeof(mpd_Stats)));
  stats->numberOfArtists = 0;
  stats->numberOfAlbums = 0;
  stats->numberOfSongs = 0;
  stats->uptime = 0;
  stats->dbUpdateTime = 0;
  stats->playTime = 0;
  stats->dbPlayTime = 0;

  if (connection->error != 0) {
    free(stats);
    return nullptr;
  }
  while (connection->returnElement != nullptr) {
    mpd_ReturnElement *re = connection->returnElement;

    if (strcmp(re->name, "artists") == 0) {
      stats->numberOfArtists = atoi(re->value);
    } else if (strcmp(re->name, "albums") == 0) {
      stats->numberOfAlbums = atoi(re->value);
    } else if (strcmp(re->name, "songs") == 0) {
      stats->numberOfSongs = atoi(re->value);
    } else if (strcmp(re->name, "uptime") == 0) {
      stats->uptime = strtol(re->value, nullptr, 10);
    } else if (strcmp(re->name, "db_update") == 0) {
      stats->dbUpdateTime = strtol(re->value, nullptr, 10);
    } else if (strcmp(re->name, "playtime") == 0) {
      stats->playTime = strtol(re->value, nullptr, 10);
    } else if (strcmp(re->name, "db_playtime") == 0) {
      stats->dbPlayTime = strtol(re->value, nullptr, 10);
    }

    mpd_getNextReturnElement(connection);
    if (connection->error != 0) {
      free(stats);
      return nullptr;
    }
  }

  if (connection->error != 0) {
    free(stats);
    return nullptr;
  }

  return stats;
}

void mpd_freeStats(mpd_Stats *stats) { free(stats); }

mpd_SearchStats *mpd_getSearchStats(mpd_Connection *connection) {
  mpd_SearchStats *stats;
  mpd_ReturnElement *re;

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  if (connection->returnElement == nullptr) {
    mpd_getNextReturnElement(connection);
  }

  if (connection->error != 0) { return nullptr; }

  stats = static_cast<mpd_SearchStats *>(malloc(sizeof(mpd_SearchStats)));
  stats->numberOfSongs = 0;
  stats->playTime = 0;

  while (connection->returnElement != nullptr) {
    re = connection->returnElement;

    if (strcmp(re->name, "songs") == 0) {
      stats->numberOfSongs = atoi(re->value);
    } else if (strcmp(re->name, "playtime") == 0) {
      stats->playTime = strtol(re->value, nullptr, 10);
    }

    mpd_getNextReturnElement(connection);
    if (connection->error != 0) {
      free(stats);
      return nullptr;
    }
  }

  if (connection->error != 0) {
    free(stats);
    return nullptr;
  }

  return stats;
}

void mpd_freeSearchStats(mpd_SearchStats *stats) { free(stats); }

static void mpd_initSong(mpd_Song *song) {
  song->file = nullptr;
  song->artist = nullptr;
  song->albumartist = nullptr;
  song->album = nullptr;
  song->track = nullptr;
  song->title = nullptr;
  song->name = nullptr;
  song->date = nullptr;
  /* added by Qball */
  song->genre = nullptr;
  song->composer = nullptr;
  song->performer = nullptr;
  song->disc = nullptr;
  song->comment = nullptr;

  song->time = MPD_SONG_NO_TIME;
  song->pos = MPD_SONG_NO_NUM;
  song->id = MPD_SONG_NO_ID;
}

static void mpd_finishSong(mpd_Song *song) {
  free_and_zero(song->file);
  free_and_zero(song->artist);
  free_and_zero(song->albumartist);
  free_and_zero(song->album);
  free_and_zero(song->title);
  free_and_zero(song->track);
  free_and_zero(song->name);
  free_and_zero(song->date);
  free_and_zero(song->genre);
  free_and_zero(song->composer);
  free_and_zero(song->disc);
  free_and_zero(song->comment);
}

mpd_Song *mpd_newSong() {
  auto *ret = static_cast<mpd_Song *>(malloc(sizeof(mpd_Song)));

  mpd_initSong(ret);

  return ret;
}

void mpd_freeSong(mpd_Song *song) {
  mpd_finishSong(song);
  free(song);
}

mpd_Song *mpd_songDup(mpd_Song *song) {
  mpd_Song *ret = mpd_newSong();

  if (song->file != nullptr) {
    ret->file = strndup(song->file, text_buffer_size.get(*state));
  }
  if (song->artist != nullptr) {
    ret->artist = strndup(song->artist, text_buffer_size.get(*state));
  }
  if (song->albumartist != nullptr) {
    ret->artist = strndup(song->albumartist, text_buffer_size.get(*state));
  }
  if (song->album != nullptr) {
    ret->album = strndup(song->album, text_buffer_size.get(*state));
  }
  if (song->title != nullptr) {
    ret->title = strndup(song->title, text_buffer_size.get(*state));
  }
  if (song->track != nullptr) {
    ret->track = strndup(song->track, text_buffer_size.get(*state));
  }
  if (song->name != nullptr) {
    ret->name = strndup(song->name, text_buffer_size.get(*state));
  }
  if (song->date != nullptr) {
    ret->date = strndup(song->date, text_buffer_size.get(*state));
  }
  if (song->genre != nullptr) {
    ret->genre = strndup(song->genre, text_buffer_size.get(*state));
  }
  if (song->composer != nullptr) {
    ret->composer = strndup(song->composer, text_buffer_size.get(*state));
  }
  if (song->disc != nullptr) {
    ret->disc = strndup(song->disc, text_buffer_size.get(*state));
  }
  if (song->comment != nullptr) {
    ret->comment = strndup(song->comment, text_buffer_size.get(*state));
  }
  ret->time = song->time;
  ret->pos = song->pos;
  ret->id = song->id;

  return ret;
}

static void mpd_initDirectory(mpd_Directory *directory) {
  directory->path = nullptr;
}

static void mpd_finishDirectory(mpd_Directory *directory) {
  free_and_zero(directory->path);
}

mpd_Directory *mpd_newDirectory() {
  auto *directory = static_cast<mpd_Directory *>(malloc(sizeof(mpd_Directory)));

  mpd_initDirectory(directory);

  return directory;
}

void mpd_freeDirectory(mpd_Directory *directory) {
  mpd_finishDirectory(directory);

  free(directory);
}

mpd_Directory *mpd_directoryDup(mpd_Directory *directory) {
  mpd_Directory *ret = mpd_newDirectory();

  if (directory->path != nullptr) {
    ret->path = strndup(directory->path, text_buffer_size.get(*state));
  }

  return ret;
}

static void mpd_initPlaylistFile(mpd_PlaylistFile *playlist) {
  playlist->path = nullptr;
}

static void mpd_finishPlaylistFile(mpd_PlaylistFile *playlist) {
  free_and_zero(playlist->path);
}

mpd_PlaylistFile *mpd_newPlaylistFile() {
  auto *playlist =
      static_cast<mpd_PlaylistFile *>(malloc(sizeof(mpd_PlaylistFile)));

  mpd_initPlaylistFile(playlist);

  return playlist;
}

void mpd_freePlaylistFile(mpd_PlaylistFile *playlist) {
  mpd_finishPlaylistFile(playlist);
  free(playlist);
}

mpd_PlaylistFile *mpd_playlistFileDup(mpd_PlaylistFile *playlist) {
  mpd_PlaylistFile *ret = mpd_newPlaylistFile();

  if (playlist->path != nullptr) {
    ret->path = strndup(playlist->path, text_buffer_size.get(*state));
  }

  return ret;
}

static void mpd_initInfoEntity(mpd_InfoEntity *entity) {
  entity->info.directory = nullptr;
}

static void mpd_finishInfoEntity(mpd_InfoEntity *entity) {
  if (entity->info.directory != nullptr) {
    if (entity->type == MPD_INFO_ENTITY_TYPE_DIRECTORY) {
      mpd_freeDirectory(entity->info.directory);
    } else if (entity->type == MPD_INFO_ENTITY_TYPE_SONG) {
      mpd_freeSong(entity->info.song);
    } else if (entity->type == MPD_INFO_ENTITY_TYPE_PLAYLISTFILE) {
      mpd_freePlaylistFile(entity->info.playlistFile);
    }
  }
}

mpd_InfoEntity *mpd_newInfoEntity() {
  auto *entity = static_cast<mpd_InfoEntity *>(malloc(sizeof(mpd_InfoEntity)));

  mpd_initInfoEntity(entity);

  return entity;
}

void mpd_freeInfoEntity(mpd_InfoEntity *entity) {
  mpd_finishInfoEntity(entity);
  free(entity);
}

static void mpd_sendInfoCommand(mpd_Connection *connection, char *command) {
  mpd_executeCommand(connection, command);
}

mpd_InfoEntity *mpd_getNextInfoEntity(mpd_Connection *connection) {
  mpd_InfoEntity *entity = nullptr;

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  if (connection->returnElement == nullptr) {
    mpd_getNextReturnElement(connection);
  }

  if (connection->returnElement != nullptr) {
    if (strcmp(connection->returnElement->name, "file") == 0) {
      entity = mpd_newInfoEntity();
      entity->type = MPD_INFO_ENTITY_TYPE_SONG;
      entity->info.song = mpd_newSong();
      entity->info.song->file = strndup(connection->returnElement->value,
                                        text_buffer_size.get(*state));
    } else if (strcmp(connection->returnElement->name, "directory") == 0) {
      entity = mpd_newInfoEntity();
      entity->type = MPD_INFO_ENTITY_TYPE_DIRECTORY;
      entity->info.directory = mpd_newDirectory();
      entity->info.directory->path = strndup(connection->returnElement->value,
                                             text_buffer_size.get(*state));
    } else if (strcmp(connection->returnElement->name, "playlist") == 0) {
      entity = mpd_newInfoEntity();
      entity->type = MPD_INFO_ENTITY_TYPE_PLAYLISTFILE;
      entity->info.playlistFile = mpd_newPlaylistFile();
      entity->info.playlistFile->path = strndup(
          connection->returnElement->value, text_buffer_size.get(*state));
    } else if (strcmp(connection->returnElement->name, "cpos") == 0) {
      entity = mpd_newInfoEntity();
      entity->type = MPD_INFO_ENTITY_TYPE_SONG;
      entity->info.song = mpd_newSong();
      entity->info.song->pos = atoi(connection->returnElement->value);
    } else {
      connection->error = 1;
      strncpy(connection->errorStr, "problem parsing song info",
              MPD_ERRORSTR_MAX_LENGTH);
      return nullptr;
    }
  } else {
    return nullptr;
  }

  mpd_getNextReturnElement(connection);
  while (connection->returnElement != nullptr) {
    mpd_ReturnElement *re = connection->returnElement;

    if (strcmp(re->name, "file") == 0) { return entity; }
    if (strcmp(re->name, "directory") == 0) { return entity; }
    if (strcmp(re->name, "playlist") == 0) { return entity; }
    if (strcmp(re->name, "cpos") == 0) { return entity; }

    if (entity->type == MPD_INFO_ENTITY_TYPE_SONG &&
        (strlen(re->value) != 0u)) {
      if ((entity->info.song->artist == nullptr) &&
          strcmp(re->name, "Artist") == 0) {
        entity->info.song->artist =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->albumartist == nullptr) &&
                 strcmp(re->name, "AlbumArtist") == 0) {
        entity->info.song->albumartist =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->album == nullptr) &&
                 strcmp(re->name, "Album") == 0) {
        entity->info.song->album =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->title == nullptr) &&
                 strcmp(re->name, "Title") == 0) {
        entity->info.song->title =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->track == nullptr) &&
                 strcmp(re->name, "Track") == 0) {
        entity->info.song->track =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->name == nullptr) &&
                 strcmp(re->name, "Name") == 0) {
        entity->info.song->name =
            strndup(re->value, text_buffer_size.get(*state));
      } else if (entity->info.song->time == MPD_SONG_NO_TIME &&
                 strcmp(re->name, "Time") == 0) {
        entity->info.song->time = atoi(re->value);
      } else if (entity->info.song->pos == MPD_SONG_NO_NUM &&
                 strcmp(re->name, "Pos") == 0) {
        entity->info.song->pos = atoi(re->value);
      } else if (entity->info.song->id == MPD_SONG_NO_ID &&
                 strcmp(re->name, "Id") == 0) {
        entity->info.song->id = atoi(re->value);
      } else if ((entity->info.song->date == nullptr) &&
                 strcmp(re->name, "Date") == 0) {
        entity->info.song->date =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->genre == nullptr) &&
                 strcmp(re->name, "Genre") == 0) {
        entity->info.song->genre =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->composer == nullptr) &&
                 strcmp(re->name, "Composer") == 0) {
        entity->info.song->composer =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->performer == nullptr) &&
                 strcmp(re->name, "Performer") == 0) {
        entity->info.song->performer =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->disc == nullptr) &&
                 strcmp(re->name, "Disc") == 0) {
        entity->info.song->disc =
            strndup(re->value, text_buffer_size.get(*state));
      } else if ((entity->info.song->comment == nullptr) &&
                 strcmp(re->name, "Comment") == 0) {
        entity->info.song->comment =
            strndup(re->value, text_buffer_size.get(*state));
      }
    } else if (entity->type == MPD_INFO_ENTITY_TYPE_DIRECTORY) {
    } else if (entity->type == MPD_INFO_ENTITY_TYPE_PLAYLISTFILE) {
    }

    mpd_getNextReturnElement(connection);
  }

  return entity;
}

static char *mpd_getNextReturnElementNamed(mpd_Connection *connection,
                                           const char *name) {
  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  mpd_getNextReturnElement(connection);
  while (connection->returnElement != nullptr) {
    mpd_ReturnElement *re = connection->returnElement;

    if (strcmp(re->name, name) == 0) {
      return strndup(re->value, text_buffer_size.get(*state));
    }
    mpd_getNextReturnElement(connection);
  }

  return nullptr;
}

char *mpd_getNextTag(mpd_Connection *connection, int type) {
  if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES ||
      type == MPD_TAG_ITEM_ANY) {
    return nullptr;
  }
  if (type == MPD_TAG_ITEM_FILENAME) {
    return mpd_getNextReturnElementNamed(connection, "file");
  }
  return mpd_getNextReturnElementNamed(connection, mpdTagItemKeys[type]);
}

char *mpd_getNextArtist(mpd_Connection *connection) {
  return mpd_getNextReturnElementNamed(connection, "Artist");
}

char *mpd_getNextAlbum(mpd_Connection *connection) {
  return mpd_getNextReturnElementNamed(connection, "Album");
}

void mpd_sendPlaylistInfoCommand(mpd_Connection *connection, int songPos) {
  int len = strlen("playlistinfo") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistinfo \"%i\"\n", songPos);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendPlaylistIdCommand(mpd_Connection *connection, int id) {
  int len = strlen("playlistid") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistid \"%i\"\n", id);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendPlChangesCommand(mpd_Connection *connection, long long playlist) {
  int len = strlen("plchanges") + 2 + LONGLONGLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "plchanges \"%lld\"\n", playlist);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendPlChangesPosIdCommand(mpd_Connection *connection,
                                   long long playlist) {
  int len = strlen("plchangesposid") + 2 + LONGLONGLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "plchangesposid \"%lld\"\n", playlist);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendListallCommand(mpd_Connection *connection, const char *dir) {
  char *sDir = mpd_sanitizeArg(dir);
  int len = strlen("listall") + 2 + strlen(sDir) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "listall \"%s\"\n", sDir);
  mpd_sendInfoCommand(connection, string);
  free(string);
  free(sDir);
}

void mpd_sendListallInfoCommand(mpd_Connection *connection, const char *dir) {
  char *sDir = mpd_sanitizeArg(dir);
  int len = strlen("listallinfo") + 2 + strlen(sDir) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "listallinfo \"%s\"\n", sDir);
  mpd_sendInfoCommand(connection, string);
  free(string);
  free(sDir);
}

void mpd_sendLsInfoCommand(mpd_Connection *connection, const char *dir) {
  char *sDir = mpd_sanitizeArg(dir);
  int len = strlen("lsinfo") + 2 + strlen(sDir) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "lsinfo \"%s\"\n", sDir);
  mpd_sendInfoCommand(connection, string);
  free(string);
  free(sDir);
}

void mpd_sendCurrentSongCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "currentsong\n");
}

void mpd_sendSearchCommand(mpd_Connection *connection, int table,
                           const char *str) {
  mpd_startSearch(connection, 0);
  mpd_addConstraintSearch(connection, table, str);
  mpd_commitSearch(connection);
}

void mpd_sendFindCommand(mpd_Connection *connection, int table,
                         const char *str) {
  mpd_startSearch(connection, 1);
  mpd_addConstraintSearch(connection, table, str);
  mpd_commitSearch(connection);
}

void mpd_sendListCommand(mpd_Connection *connection, int table,
                         const char *arg1) {
  char st[7];
  int len;
  char *string;

  if (table == MPD_TABLE_ARTIST) {
    strncpy(st, "artist", strlen("artist") + 1);
  } else if (table == MPD_TABLE_ALBUM) {
    strncpy(st, "album", strlen("album") + 1);
  } else {
    connection->error = 1;
    strncpy(connection->errorStr, "unknown table for list",
            MPD_ERRORSTR_MAX_LENGTH);
    return;
  }
  if (arg1 != nullptr) {
    char *sanitArg1 = mpd_sanitizeArg(arg1);

    len = strlen("list") + 1 + strlen(sanitArg1) + 2 + strlen(st) + 3;
    string = static_cast<char *>(malloc(len));
    snprintf(string, len, "list %s \"%s\"\n", st, sanitArg1);
    free(sanitArg1);
  } else {
    len = strlen("list") + 1 + strlen(st) + 2;
    string = static_cast<char *>(malloc(len));
    snprintf(string, len, "list %s\n", st);
  }
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendAddCommand(mpd_Connection *connection, const char *file) {
  char *sFile = mpd_sanitizeArg(file);
  int len = strlen("add") + 2 + strlen(sFile) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "add \"%s\"\n", sFile);
  mpd_executeCommand(connection, string);
  free(string);
  free(sFile);
}

int mpd_sendAddIdCommand(mpd_Connection *connection, const char *file) {
  int retval = -1;
  char *sFile = mpd_sanitizeArg(file);
  int len = strlen("addid") + 2 + strlen(sFile) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "addid \"%s\"\n", sFile);
  mpd_sendInfoCommand(connection, string);
  free(string);
  free(sFile);

  string = mpd_getNextReturnElementNamed(connection, "Id");
  if (string != nullptr) {
    retval = atoi(string);
    free(string);
  }

  return retval;
}

void mpd_sendDeleteCommand(mpd_Connection *connection, int songPos) {
  int len = strlen("delete") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "delete \"%i\"\n", songPos);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendDeleteIdCommand(mpd_Connection *connection, int id) {
  int len = strlen("deleteid") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "deleteid \"%i\"\n", id);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendSaveCommand(mpd_Connection *connection, const char *name) {
  char *sName = mpd_sanitizeArg(name);
  int len = strlen("save") + 2 + strlen(sName) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "save \"%s\"\n", sName);
  mpd_executeCommand(connection, string);
  free(string);
  free(sName);
}

void mpd_sendLoadCommand(mpd_Connection *connection, const char *name) {
  char *sName = mpd_sanitizeArg(name);
  int len = strlen("load") + 2 + strlen(sName) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "load \"%s\"\n", sName);
  mpd_executeCommand(connection, string);
  free(string);
  free(sName);
}

void mpd_sendRmCommand(mpd_Connection *connection, const char *name) {
  char *sName = mpd_sanitizeArg(name);
  int len = strlen("rm") + 2 + strlen(sName) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "rm \"%s\"\n", sName);
  mpd_executeCommand(connection, string);
  free(string);
  free(sName);
}

void mpd_sendRenameCommand(mpd_Connection *connection, const char *from,
                           const char *to) {
  char *sFrom = mpd_sanitizeArg(from);
  char *sTo = mpd_sanitizeArg(to);
  int len = strlen("rename") + 2 + strlen(sFrom) + 3 + strlen(sTo) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "rename \"%s\" \"%s\"\n", sFrom, sTo);
  mpd_executeCommand(connection, string);
  free(string);
  free(sFrom);
  free(sTo);
}

void mpd_sendShuffleCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "shuffle\n");
}

void mpd_sendClearCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "clear\n");
}

void mpd_sendPlayCommand(mpd_Connection *connection, int songPos) {
  int len = strlen("play") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "play \"%i\"\n", songPos);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendPlayIdCommand(mpd_Connection *connection, int id) {
  int len = strlen("playid") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playid \"%i\"\n", id);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendStopCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "stop\n");
}

void mpd_sendPauseCommand(mpd_Connection *connection, int pauseMode) {
  int len = strlen("pause") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "pause \"%i\"\n", pauseMode);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendNextCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "next\n");
}

void mpd_sendMoveCommand(mpd_Connection *connection, int from, int to) {
  int len = strlen("move") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "move \"%i\" \"%i\"\n", from, to);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendMoveIdCommand(mpd_Connection *connection, int id, int to) {
  int len = strlen("moveid") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "moveid \"%i\" \"%i\"\n", id, to);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendSwapCommand(mpd_Connection *connection, int song1, int song2) {
  int len = strlen("swap") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "swap \"%i\" \"%i\"\n", song1, song2);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendSwapIdCommand(mpd_Connection *connection, int id1, int id2) {
  int len = strlen("swapid") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "swapid \"%i\" \"%i\"\n", id1, id2);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendSeekCommand(mpd_Connection *connection, int song, int seek_time) {
  int len = strlen("seek") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "seek \"%i\" \"%i\"\n", song, seek_time);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendSeekIdCommand(mpd_Connection *connection, int id, int seek_time) {
  int len = strlen("seekid") + 2 + INTLEN + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "seekid \"%i\" \"%i\"\n", id, seek_time);
  mpd_sendInfoCommand(connection, string);
  free(string);
}

void mpd_sendUpdateCommand(mpd_Connection *connection, char *path) {
  char *sPath = mpd_sanitizeArg(path);
  int len = strlen("update") + 2 + strlen(sPath) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "update \"%s\"\n", sPath);
  mpd_sendInfoCommand(connection, string);
  free(string);
  free(sPath);
}

int mpd_getUpdateId(mpd_Connection *connection) {
  char *jobid;
  int ret = 0;

  jobid = mpd_getNextReturnElementNamed(connection, "updating_db");
  if (jobid != nullptr) {
    ret = atoi(jobid);
    free(jobid);
  }

  return ret;
}

void mpd_sendPrevCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "previous\n");
}

void mpd_sendRepeatCommand(mpd_Connection *connection, int repeatMode) {
  int len = strlen("repeat") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "repeat \"%i\"\n", repeatMode);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendRandomCommand(mpd_Connection *connection, int randomMode) {
  int len = strlen("random") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "random \"%i\"\n", randomMode);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendSetvolCommand(mpd_Connection *connection, int volumeChange) {
  int len = strlen("setvol") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "setvol \"%i\"\n", volumeChange);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendVolumeCommand(mpd_Connection *connection, int volumeChange) {
  int len = strlen("volume") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "volume \"%i\"\n", volumeChange);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendCrossfadeCommand(mpd_Connection *connection, int seconds) {
  int len = strlen("crossfade") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "crossfade \"%i\"\n", seconds);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendPasswordCommand(mpd_Connection *connection, const char *pass) {
  char *sPass = mpd_sanitizeArg(pass);
  int len = strlen("password") + 2 + strlen(sPass) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "password \"%s\"\n", sPass);
  mpd_executeCommand(connection, string);
  free(string);
  free(sPass);
}

void mpd_sendCommandListBegin(mpd_Connection *connection) {
  if (connection->commandList != 0) {
    strncpy(connection->errorStr, "already in command list mode",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }
  connection->commandList = COMMAND_LIST;
  mpd_executeCommand(connection, "command_list_begin\n");
}

void mpd_sendCommandListOkBegin(mpd_Connection *connection) {
  if (connection->commandList != 0) {
    strncpy(connection->errorStr, "already in command list mode",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }
  connection->commandList = COMMAND_LIST_OK;
  mpd_executeCommand(connection, "command_list_ok_begin\n");
  connection->listOks = 0;
}

void mpd_sendCommandListEnd(mpd_Connection *connection) {
  if (connection->commandList == 0) {
    strncpy(connection->errorStr, "not in command list mode",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }
  connection->commandList = 0;
  mpd_executeCommand(connection, "command_list_end\n");
}

void mpd_sendOutputsCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "outputs\n");
}

mpd_OutputEntity *mpd_getNextOutput(mpd_Connection *connection) {
  mpd_OutputEntity *output = nullptr;

  if ((connection->doneProcessing != 0) ||
      ((connection->listOks != 0) && (connection->doneListOk != 0))) {
    return nullptr;
  }

  if (connection->error != 0) { return nullptr; }

  output = static_cast<mpd_OutputEntity *>(malloc(sizeof(mpd_OutputEntity)));
  output->id = -10;
  output->name = nullptr;
  output->enabled = 0;

  if (connection->returnElement == nullptr) {
    mpd_getNextReturnElement(connection);
  }

  while (connection->returnElement != nullptr) {
    mpd_ReturnElement *re = connection->returnElement;

    if (strcmp(re->name, "outputid") == 0) {
      if (output != nullptr && output->id >= 0) { return output; }
      output->id = atoi(re->value);
    } else if (strcmp(re->name, "outputname") == 0) {
      output->name = strndup(re->value, text_buffer_size.get(*state));
    } else if (strcmp(re->name, "outputenabled") == 0) {
      output->enabled = atoi(re->value);
    }

    mpd_getNextReturnElement(connection);
    if (connection->error != 0) {
      free(output);
      return nullptr;
    }
  }

  return output;
}

void mpd_sendEnableOutputCommand(mpd_Connection *connection, int outputId) {
  int len = strlen("enableoutput") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "enableoutput \"%i\"\n", outputId);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_sendDisableOutputCommand(mpd_Connection *connection, int outputId) {
  int len = strlen("disableoutput") + 2 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "disableoutput \"%i\"\n", outputId);
  mpd_executeCommand(connection, string);
  free(string);
}

void mpd_freeOutputElement(mpd_OutputEntity *output) {
  free(output->name);
  free(output);
}

/** odd naming, but it gets the not allowed commands */
void mpd_sendNotCommandsCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "notcommands\n");
}

/** odd naming, but it gets the allowed commands */
void mpd_sendCommandsCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "commands\n");
}

/** Get the next returned command */
char *mpd_getNextCommand(mpd_Connection *connection) {
  return mpd_getNextReturnElementNamed(connection, "command");
}

void mpd_sendUrlHandlersCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "urlhandlers\n");
}

char *mpd_getNextHandler(mpd_Connection *connection) {
  return mpd_getNextReturnElementNamed(connection, "handler");
}

void mpd_sendTagTypesCommand(mpd_Connection *connection) {
  mpd_executeCommand(connection, "tagtypes\n");
}

char *mpd_getNextTagType(mpd_Connection *connection) {
  return mpd_getNextReturnElementNamed(connection, "tagtype");
}

void mpd_startSearch(mpd_Connection *connection, int exact) {
  if (connection->request != nullptr) {
    strncpy(connection->errorStr, "search already in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  if (exact != 0) {
    connection->request = strndup("find", text_buffer_size.get(*state));
  } else {
    connection->request = strndup("search", text_buffer_size.get(*state));
  }
}

void mpd_startStatsSearch(mpd_Connection *connection) {
  if (connection->request != nullptr) {
    strncpy(connection->errorStr, "search already in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  connection->request = strndup("count", text_buffer_size.get(*state));
}

void mpd_startPlaylistSearch(mpd_Connection *connection, int exact) {
  if (connection->request != nullptr) {
    strncpy(connection->errorStr, "search already in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  if (exact != 0) {
    connection->request = strndup("playlistfind", text_buffer_size.get(*state));
  } else {
    connection->request =
        strndup("playlistsearch", text_buffer_size.get(*state));
  }
}

void mpd_startFieldSearch(mpd_Connection *connection, int type) {
  const char *strtype;
  int len;

  if (connection->request != nullptr) {
    strncpy(connection->errorStr, "search already in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES) {
    strncpy(connection->errorStr, "invalid type specified",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  strtype = mpdTagItemKeys[type];

  len = 5 + strlen(strtype) + 1;
  connection->request = static_cast<char *>(malloc(len));

  snprintf(connection->request, len, "list %c%s",
           tolower((unsigned char)strtype[0]), strtype + 1);
}

void mpd_addConstraintSearch(mpd_Connection *connection, int type,
                             const char *name) {
  const char *strtype;
  char *arg;
  int len;
  char *string;

  if (connection->request == nullptr) {
    strncpy(connection->errorStr, "no search in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES) {
    strncpy(connection->errorStr, "invalid type specified",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  if (name == nullptr) {
    strncpy(connection->errorStr, "no name specified", MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  string = strndup(connection->request, text_buffer_size.get(*state));
  strtype = mpdTagItemKeys[type];
  arg = mpd_sanitizeArg(name);

  len = strlen(string) + 1 + strlen(strtype) + 2 + strlen(arg) + 2;
  connection->request = static_cast<char *>(realloc(connection->request, len));
  snprintf(connection->request, len, "%s %c%s \"%s\"", string,
           tolower((unsigned char)strtype[0]), strtype + 1, arg);

  free(string);
  free(arg);
}

void mpd_commitSearch(mpd_Connection *connection) {
  int len;

  if (connection->request == nullptr) {
    strncpy(connection->errorStr, "no search in progress",
            MPD_ERRORSTR_MAX_LENGTH);
    connection->error = 1;
    return;
  }

  len = strlen(connection->request) + 2;
  connection->request = static_cast<char *>(realloc(connection->request, len));
  connection->request[len - 2] = '\n';
  connection->request[len - 1] = '\0';
  mpd_sendInfoCommand(connection, connection->request);

  free_and_zero(connection->request);
}

/**
 * @param connection	a MpdConnection
 * @param path			the path to the playlist.
 *
 * List the content, with full metadata, of a stored playlist. */
void mpd_sendListPlaylistInfoCommand(mpd_Connection *connection, char *path) {
  char *arg = mpd_sanitizeArg(path);
  int len = strlen("listplaylistinfo") + 2 + strlen(arg) + 3;
  auto *query = static_cast<char *>(malloc(len));

  snprintf(query, len, "listplaylistinfo \"%s\"\n", arg);
  mpd_sendInfoCommand(connection, query);
  free(arg);
  free(query);
}

/**
 * @param connection	a MpdConnection
 * @param path			the path to the playlist.
 *
 * List the content of a stored playlist. */
void mpd_sendListPlaylistCommand(mpd_Connection *connection, char *path) {
  char *arg = mpd_sanitizeArg(path);
  int len = strlen("listplaylist") + 2 + strlen(arg) + 3;
  auto *query = static_cast<char *>(malloc(len));

  snprintf(query, len, "listplaylist \"%s\"\n", arg);
  mpd_sendInfoCommand(connection, query);
  free(arg);
  free(query);
}

void mpd_sendPlaylistClearCommand(mpd_Connection *connection, char *path) {
  char *sPath = mpd_sanitizeArg(path);
  int len = strlen("playlistclear") + 2 + strlen(sPath) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistclear \"%s\"\n", sPath);
  mpd_executeCommand(connection, string);
  free(sPath);
  free(string);
}

void mpd_sendPlaylistAddCommand(mpd_Connection *connection, char *playlist,
                                char *path) {
  char *sPlaylist = mpd_sanitizeArg(playlist);
  char *sPath = mpd_sanitizeArg(path);
  int len =
      strlen("playlistadd") + 2 + strlen(sPlaylist) + 3 + strlen(sPath) + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistadd \"%s\" \"%s\"\n", sPlaylist, sPath);
  mpd_executeCommand(connection, string);
  free(sPlaylist);
  free(sPath);
  free(string);
}

void mpd_sendPlaylistMoveCommand(mpd_Connection *connection, char *playlist,
                                 int from, int to) {
  char *sPlaylist = mpd_sanitizeArg(playlist);
  int len = strlen("playlistmove") + 2 + strlen(sPlaylist) + 3 + INTLEN + 3 +
            INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistmove \"%s\" \"%i\" \"%i\"\n", sPlaylist, from,
           to);
  mpd_executeCommand(connection, string);
  free(sPlaylist);
  free(string);
}

void mpd_sendPlaylistDeleteCommand(mpd_Connection *connection, char *playlist,
                                   int pos) {
  char *sPlaylist = mpd_sanitizeArg(playlist);
  int len = strlen("playlistdelete") + 2 + strlen(sPlaylist) + 3 + INTLEN + 3;
  auto *string = static_cast<char *>(malloc(len));

  snprintf(string, len, "playlistdelete \"%s\" \"%i\"\n", sPlaylist, pos);
  mpd_executeCommand(connection, string);
  free(sPlaylist);
  free(string);
}