1 /*
2  *
3  * libmpdclient
4  * (c)2003-2006 by Warren Dukes (warren.dukes@gmail.com)
5  * This project's homepage is: http://www.musicpd.org
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * - Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  *
14  * - Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in the
16  * documentation and/or other materials provided with the distribution.
17  *
18  * - Neither the name of the Music Player Daemon nor the names of its
19  * contributors may be used to endorse or promote products derived from
20  * this software without specific prior written permission.
21  *
22  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
25  * A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR
26  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
27  * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
28  * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
29  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
30  * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
31  * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
32  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
33  *
34  */
35 
36 #include "libmpdclient.h"
37 #include "conky.h"
38 
39 #include <fcntl.h>
40 #include <sys/param.h>
41 #include <sys/types.h>
42 #include <unistd.h>
43 #include <cctype>
44 #include <cerrno>
45 #include <climits>
46 
47 #ifdef WIN32
48 #include <winsock.h>
49 #include <ws2tcpip.h>
50 #else
51 #include <arpa/inet.h>
52 #include <netdb.h>
53 #include <netinet/in.h>
54 #include <sys/socket.h>
55 #include <sys/un.h>
56 #endif
57 
58 #ifndef SUN_LEN
59 #define SUN_LEN(a) sizeof(a)
60 #endif
61 
62 #ifndef SOCK_CLOEXEC
63 #define SOCK_CLOEXEC O_CLOEXEC
64 #endif /* SOCK_CLOEXEC */
65 
66 /* (bits + 1) / 3 (plus the sign character) */
67 #define INTLEN ((sizeof(int) * CHAR_BIT + 1) / 3 + 1)
68 #define LONGLONGLEN ((sizeof(long long) * CHAR_BIT + 1) / 3 + 1)
69 
70 #define COMMAND_LIST 1
71 #define COMMAND_LIST_OK 2
72 
73 #ifndef MPD_NO_GAI
74 #ifdef AI_ADDRCONFIG
75 #define MPD_HAVE_GAI
76 #endif
77 #endif
78 
79 #ifndef MSG_DONTWAIT
80 #define MSG_DONTWAIT 0
81 #endif
82 
83 #ifdef WIN32
84 #define SELECT_ERRNO_IGNORE (errno == WSAEINTR || errno == WSAEINPROGRESS)
85 #define SENDRECV_ERRNO_IGNORE SELECT_ERRNO_IGNORE
86 #else
87 #define SELECT_ERRNO_IGNORE (errno == EINTR)
88 #define SENDRECV_ERRNO_IGNORE (errno == EINTR || errno == EAGAIN)
89 #define winsock_dll_error(c) 0
90 #define closesocket(s) close(s)
91 #define WSACleanup() \
92   do { /* nothing */ \
93   } while (0)
94 #endif
95 
96 #ifdef WIN32
winsock_dll_error(mpd_Connection * connection)97 static int winsock_dll_error(mpd_Connection *connection) {
98   WSADATA wsaData;
99 
100   if ((WSAStartup(MAKEWORD(2, 2), &wsaData)) != 0 ||
101       LOBYTE(wsaData.wVersion) != 2 || HIBYTE(wsaData.wVersion) != 2) {
102     strncpy(connection->errorStr, "Could not find usable WinSock DLL.",
103             MPD_ERRORSTR_MAX_LENGTH);
104     connection->error = MPD_ERROR_SYSTEM;
105     return 1;
106   }
107   return 0;
108 }
109 
do_connect_fail(mpd_Connection * connection,const struct sockaddr * serv_addr,int addrlen)110 static int do_connect_fail(mpd_Connection *connection,
111                            const struct sockaddr *serv_addr, int addrlen) {
112   int iMode = 1; /* 0 = blocking, else non-blocking */
113 
114   ioctlsocket(connection->sock, FIONBIO, (u_long FAR *)&iMode);
115   return (connect(connection->sock, serv_addr, addrlen) == SOCKET_ERROR &&
116           WSAGetLastError() != WSAEWOULDBLOCK);
117 }
118 #else  /* !WIN32 (sane operating systems) */
do_connect_fail(mpd_Connection * connection,const struct sockaddr * serv_addr,int addrlen)119 static int do_connect_fail(mpd_Connection *connection,
120                            const struct sockaddr *serv_addr, int addrlen) {
121   int flags = fcntl(connection->sock, F_GETFL, 0);
122 
123   fcntl(connection->sock, F_SETFL, flags | O_NONBLOCK);
124   return static_cast<int>(connect(connection->sock, serv_addr, addrlen) < 0 &&
125                           errno != EINPROGRESS);
126 }
127 #endif /* !WIN32 */
128 
uds_connect(mpd_Connection * connection,const char * host,float timeout)129 static int uds_connect(mpd_Connection *connection, const char *host,
130                        float timeout) {
131   struct sockaddr_un addr {};
132 
133   strncpy(addr.sun_path, host, sizeof(addr.sun_path) - 1);
134   addr.sun_family = AF_UNIX;
135   addr.sun_path[sizeof(addr.sun_path) - 1] = 0;
136   connection->sock = socket(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC, 0);
137 
138   if (connection->sock < 0) {
139     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
140              "problems creating socket: %s", strerror(errno));
141     connection->error = MPD_ERROR_SYSTEM;
142     return -1;
143   }
144 
145   mpd_setConnectionTimeout(connection, timeout);
146 
147   /* connect stuff */
148   if (do_connect_fail(connection, reinterpret_cast<struct sockaddr *>(&addr),
149                       SUN_LEN(&addr)) != 0) {
150     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
151              "problems connecting socket: %s", strerror(errno));
152     closesocket(connection->sock);
153     connection->sock = -1;
154     connection->error = MPD_ERROR_SYSTEM;
155     return -1;
156   }
157 
158   return 0;
159 }
160 
161 #ifdef MPD_HAVE_GAI
mpd_connect(mpd_Connection * connection,const char * host,int port,float timeout)162 static int mpd_connect(mpd_Connection *connection, const char *host, int port,
163                        float timeout) {
164   int error;
165   char service[INTLEN + 1];
166   struct addrinfo hints {};
167   struct addrinfo *res = nullptr;
168   struct addrinfo *addrinfo = nullptr;
169 
170   if (*host == '/') { return uds_connect(connection, host, timeout); }
171 
172   /* Setup hints */
173   hints.ai_flags = AI_ADDRCONFIG;
174   hints.ai_family = AF_UNSPEC;
175   hints.ai_socktype = SOCK_STREAM;
176   hints.ai_protocol = IPPROTO_TCP;
177   hints.ai_addrlen = 0;
178   hints.ai_addr = nullptr;
179   hints.ai_canonname = nullptr;
180   hints.ai_next = nullptr;
181 
182   snprintf(service, sizeof(service), "%i", port);
183 
184   error = getaddrinfo(host, service, &hints, &addrinfo);
185 
186   if (error != 0) {
187     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
188              "host \"%s\" not found: %s", host, gai_strerror(error));
189     connection->error = MPD_ERROR_UNKHOST;
190     return -1;
191   }
192 
193   for (res = addrinfo; res != nullptr; res = res->ai_next) {
194     /* create socket */
195     if (connection->sock > -1) { closesocket(connection->sock); }
196     connection->sock =
197         socket(res->ai_family, SOCK_STREAM | SOCK_CLOEXEC, res->ai_protocol);
198     if (connection->sock < 0) {
199       snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
200                "problems creating socket: %s", strerror(errno));
201       connection->error = MPD_ERROR_SYSTEM;
202       freeaddrinfo(addrinfo);
203       return -1;
204     }
205 
206     mpd_setConnectionTimeout(connection, timeout);
207 
208     /* connect stuff */
209     if (do_connect_fail(connection, res->ai_addr, res->ai_addrlen) != 0) {
210       /* try the next address family */
211       closesocket(connection->sock);
212       connection->sock = -1;
213       continue;
214     }
215   }
216 
217   freeaddrinfo(addrinfo);
218 
219   if (connection->sock < 0) {
220     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
221              "problems connecting to \"%s\" on port %i: %s", host, port,
222              strerror(errno));
223     connection->error = MPD_ERROR_CONNPORT;
224 
225     return -1;
226   }
227 
228   return 0;
229 }
230 #else /* !MPD_HAVE_GAI */
mpd_connect(mpd_Connection * connection,const char * host,int port,float timeout)231 static int mpd_connect(mpd_Connection *connection, const char *host, int port,
232                        float timeout) {
233   struct hostent he, *he_res = 0;
234   int he_errno;
235   char hostbuff[2048];
236   struct sockaddr *dest;
237   int destlen;
238   struct sockaddr_in sin;
239 
240   if (*host == '/') return uds_connect(connection, host, timeout);
241 
242 #ifdef HAVE_GETHOSTBYNAME_R
243   if (gethostbyname_r(host, &he, hostbuff, sizeof(hostbuff), &he_res,
244                       &he_errno)) {  // get the host info
245     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH, "%s ('%s')",
246              hstrerror(h_errno), host);
247     connection->error = MPD_ERROR_UNKHOST;
248     return -1;
249   }
250 #else  /* HAVE_GETHOSTBYNAME_R */
251   if (!(he_res = gethostbyname(host))) {
252     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
253              "host \"%s\" not found", host);
254     connection->error = MPD_ERROR_UNKHOST;
255     return -1;
256   }
257 #endif /* HAVE_GETHOSTBYNAME_R */
258 
259   memset(&sin, 0, sizeof(struct sockaddr_in));
260   /* dest.sin_family = he_res->h_addrtype; */
261   sin.sin_family = AF_INET;
262   sin.sin_port = htons(port);
263 
264   switch (he_res->h_addrtype) {
265     case AF_INET:
266       memcpy((char *)&sin.sin_addr.s_addr, (char *)he_res->h_addr,
267              he_res->h_length);
268       dest = (struct sockaddr *)&sin;
269       destlen = sizeof(struct sockaddr_in);
270       break;
271     default:
272       strncpy(connection->errorStr, "address type is not IPv4",
273               MPD_ERRORSTR_MAX_LENGTH);
274       connection->error = MPD_ERROR_SYSTEM;
275       return -1;
276       break;
277   }
278 
279   if (connection->sock > -1) { closesocket(connection->sock); }
280   if ((connection->sock = socket(dest->sa_family, SOCK_STREAM, 0)) < 0) {
281     strncpy(connection->errorStr, "problems creating socket",
282             MPD_ERRORSTR_MAX_LENGTH);
283     connection->error = MPD_ERROR_SYSTEM;
284     return -1;
285   }
286 
287   mpd_setConnectionTimeout(connection, timeout);
288 
289   /* connect stuff */
290   if (do_connect_fail(connection, dest, destlen)) {
291     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
292              "problems connecting to \"%s\" on port %i", host, port);
293     connection->error = MPD_ERROR_CONNPORT;
294     return -1;
295   }
296 
297   return 0;
298 }
299 #endif /* !MPD_HAVE_GAI */
300 
301 const char *mpdTagItemKeys[MPD_TAG_NUM_OF_ITEM_TYPES] = {
302     "Artist",   "Album",     "Title",   "Track", "Name",     "Genre", "Date",
303     "Composer", "Performer", "Comment", "Disc",  "Filename", "Any"};
304 
mpd_sanitizeArg(const char * arg)305 static char *mpd_sanitizeArg(const char *arg) {
306   size_t i;
307   char *ret;
308   const char *c;
309   char *rc;
310 
311   /* instead of counting in that loop above,
312    * just use a bit more memory and halve running time */
313   ret = static_cast<char *>(malloc(strlen(arg) * 2 + 1));
314 
315   c = arg;
316   rc = ret;
317   for (i = strlen(arg) + 1; i != 0; --i) {
318     if (*c == '"' || *c == '\\') { *rc++ = '\\'; }
319     *(rc++) = *(c++);
320   }
321 
322   return ret;
323 }
324 
mpd_newReturnElement(const char * name,const char * value)325 static mpd_ReturnElement *mpd_newReturnElement(const char *name,
326                                                const char *value) {
327   auto *ret =
328       static_cast<mpd_ReturnElement *>(malloc(sizeof(mpd_ReturnElement)));
329 
330   ret->name = strndup(name, text_buffer_size.get(*state));
331   ret->value = strndup(value, text_buffer_size.get(*state));
332 
333   return ret;
334 }
335 
mpd_freeReturnElement(mpd_ReturnElement * re)336 static void mpd_freeReturnElement(mpd_ReturnElement *re) {
337   free(re->name);
338   free(re->value);
339   free(re);
340 }
341 
mpd_setConnectionTimeout(mpd_Connection * connection,float timeout)342 void mpd_setConnectionTimeout(mpd_Connection *connection, float timeout) {
343   connection->timeout.tv_sec = static_cast<int>(timeout);
344   connection->timeout.tv_usec =
345       static_cast<int>((timeout - connection->timeout.tv_sec) * 1e6 + 0.5);
346 }
347 
mpd_parseWelcome(mpd_Connection * connection,const char * host,int port,char * output)348 static int mpd_parseWelcome(mpd_Connection *connection, const char *host,
349                             int port, /* char *rt, */ char *output) {
350   char *tmp;
351   char *test;
352   int i;
353 
354   if (static_cast<int>(strncmp(output, MPD_WELCOME_MESSAGE,
355                                strlen(MPD_WELCOME_MESSAGE)) != 0) != 0) {
356     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
357              "mpd not running on port %i on host \"%s\"", port, host);
358     connection->error = MPD_ERROR_NOTMPD;
359     return 1;
360   }
361 
362   tmp = &output[strlen(MPD_WELCOME_MESSAGE)];
363 
364   for (i = 0; i < 3; i++) {
365     if (tmp != nullptr) { connection->version[i] = strtol(tmp, &test, 10); }
366 
367     if ((tmp == nullptr) || (test[0] != '.' && test[0] != '\0')) {
368       snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
369                "error parsing version number at \"%s\"",
370                &output[strlen(MPD_WELCOME_MESSAGE)]);
371       connection->error = MPD_ERROR_NOTMPD;
372       return 1;
373     }
374     tmp = ++test;
375   }
376 
377   return 0;
378 }
379 
mpd_newConnection(const char * host,int port,float timeout)380 mpd_Connection *mpd_newConnection(const char *host, int port, float timeout) {
381   int err;
382   char *rt;
383   char *output = nullptr;
384   auto *connection =
385       static_cast<mpd_Connection *>(malloc(sizeof(mpd_Connection)));
386   struct timeval tv {};
387   fd_set fds;
388 
389   strncpy(connection->buffer, "", 1);
390   connection->buflen = 0;
391   connection->bufstart = 0;
392   strncpy(connection->errorStr, "", MPD_ERRORSTR_MAX_LENGTH);
393   connection->error = 0;
394   connection->doneProcessing = 0;
395   connection->commandList = 0;
396   connection->listOks = 0;
397   connection->doneListOk = 0;
398   connection->sock = -1;
399   connection->returnElement = nullptr;
400   connection->request = nullptr;
401 
402   if (winsock_dll_error(connection)) { return connection; }
403 
404   if (mpd_connect(connection, host, port, timeout) < 0) { return connection; }
405 
406   while ((rt = strstr(connection->buffer, "\n")) == nullptr) {
407     tv.tv_sec = connection->timeout.tv_sec;
408     tv.tv_usec = connection->timeout.tv_usec;
409     FD_ZERO(&fds);
410     FD_SET(connection->sock, &fds);
411     if ((err = select(connection->sock + 1, &fds, nullptr, nullptr, &tv)) ==
412         1) {
413       int readed;
414 
415       readed = recv(connection->sock, &(connection->buffer[connection->buflen]),
416                     MPD_BUFFER_MAX_LENGTH - connection->buflen, 0);
417       if (readed <= 0) {
418         snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
419                  "problems getting a response from \"%s\" on port %i : %s",
420                  host, port, strerror(errno));
421         connection->error = MPD_ERROR_NORESPONSE;
422         return connection;
423       }
424       connection->buflen += readed;
425       connection->buffer[connection->buflen] = '\0';
426     } else if (err < 0) {
427       if SELECT_ERRNO_IGNORE { continue; }
428       snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
429                "problems connecting to \"%s\" on port %i", host, port);
430       connection->error = MPD_ERROR_CONNPORT;
431       return connection;
432     } else {
433       snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
434                "timeout in attempting to get a response from \"%s\" on "
435                "port %i",
436                host, port);
437       connection->error = MPD_ERROR_NORESPONSE;
438       return connection;
439     }
440   }
441 
442   *rt = '\0';
443   output = strndup(connection->buffer, text_buffer_size.get(*state));
444   strncpy(connection->buffer, rt + 1, MPD_BUFFER_MAX_LENGTH);
445   connection->buflen = strlen(connection->buffer);
446 
447   if (mpd_parseWelcome(connection, host, port, /* rt, */ output) == 0) {
448     connection->doneProcessing = 1;
449   }
450 
451   free(output);
452 
453   return connection;
454 }
455 
456 void mpd_clearError(mpd_Connection *connection) {
457   connection->error = 0;
458   connection->errorStr[0] = '\0';
459 }
460 
461 void mpd_closeConnection(mpd_Connection *connection) {
462   if (connection != nullptr) {
463     closesocket(connection->sock);
464     free_and_zero(connection->returnElement);
465     free_and_zero(connection->request);
466     free(connection);
467   }
468   WSACleanup();
469 }
470 
471 static void mpd_executeCommand(mpd_Connection *connection,
472                                const char *command) {
473   int ret;
474   struct timeval tv {};
475   fd_set fds;
476   const char *commandPtr = command;
477   int commandLen = strlen(command);
478 
479   if ((connection->doneProcessing == 0) && (connection->commandList == 0)) {
480     strncpy(connection->errorStr, "not done processing current command",
481             MPD_ERRORSTR_MAX_LENGTH);
482     connection->error = 1;
483     return;
484   }
485 
486   mpd_clearError(connection);
487 
488   FD_ZERO(&fds);
489   FD_SET(connection->sock, &fds);
490   tv.tv_sec = connection->timeout.tv_sec;
491   tv.tv_usec = connection->timeout.tv_usec;
492 
493   do {
494     ret = static_cast<int>(
495         select(connection->sock + 1, nullptr, &fds, nullptr, &tv));
496     if (ret != 1 && !SELECT_ERRNO_IGNORE) { break; }
497     ret = send(connection->sock, commandPtr, commandLen, MSG_DONTWAIT);
498     if (ret <= 0) {
499       if SENDRECV_ERRNO_IGNORE { continue; }
500       snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
501                "problems giving command \"%s\"", command);
502       connection->error = MPD_ERROR_SENDING;
503       return;
504     }
505     commandPtr += ret;
506     commandLen -= ret;
507   } while (commandLen > 0);
508 
509   if (commandLen > 0) {
510     perror("");
511     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
512              "timeout sending command \"%s\"", command);
513     connection->error = MPD_ERROR_TIMEOUT;
514     return;
515   }
516 
517   if (connection->commandList == 0) {
518     connection->doneProcessing = 0;
519   } else if (connection->commandList == COMMAND_LIST_OK) {
520     connection->listOks++;
521   }
522 }
523 
524 static void mpd_getNextReturnElement(mpd_Connection *connection) {
525   char *output = nullptr;
526   char *rt = nullptr;
527   char *name = nullptr;
528   char *value = nullptr;
529   fd_set fds;
530   struct timeval tv {};
531   char *tok = nullptr;
532   int readed;
533   char *bufferCheck = nullptr;
534   int err;
535   int pos;
536 
537   if (connection->returnElement != nullptr) {
538     mpd_freeReturnElement(connection->returnElement);
539   }
540   connection->returnElement = nullptr;
541 
542   if ((connection->doneProcessing != 0) ||
543       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
544     strncpy(connection->errorStr, "already done processing current command",
545             MPD_ERRORSTR_MAX_LENGTH);
546     connection->error = 1;
547     return;
548   }
549 
550   bufferCheck = connection->buffer + connection->bufstart;
551   while (connection->bufstart >= connection->buflen ||
552          ((rt = strchr(bufferCheck, '\n')) == nullptr)) {
553     if (connection->buflen >= MPD_BUFFER_MAX_LENGTH) {
554       memmove(connection->buffer, connection->buffer + connection->bufstart,
555               connection->buflen - connection->bufstart + 1);
556       connection->buflen -= connection->bufstart;
557       connection->bufstart = 0;
558     }
559     if (connection->buflen >= MPD_BUFFER_MAX_LENGTH) {
560       strncpy(connection->errorStr, "buffer overrun", MPD_ERRORSTR_MAX_LENGTH);
561       connection->error = MPD_ERROR_BUFFEROVERRUN;
562       connection->doneProcessing = 1;
563       connection->doneListOk = 0;
564       return;
565     }
566     bufferCheck = connection->buffer + connection->buflen;
567     tv.tv_sec = connection->timeout.tv_sec;
568     tv.tv_usec = connection->timeout.tv_usec;
569     FD_ZERO(&fds);
570     FD_SET(connection->sock, &fds);
571     if ((err = static_cast<int>(select(connection->sock + 1, &fds, nullptr,
572                                        nullptr, &tv) == 1)) != 0) {
573       readed = recv(connection->sock, connection->buffer + connection->buflen,
574                     MPD_BUFFER_MAX_LENGTH - connection->buflen, MSG_DONTWAIT);
575       if (readed < 0 && SENDRECV_ERRNO_IGNORE) { continue; }
576       if (readed <= 0) {
577         strncpy(connection->errorStr, "connection closed",
578                 MPD_ERRORSTR_MAX_LENGTH);
579         connection->error = MPD_ERROR_CONNCLOSED;
580         connection->doneProcessing = 1;
581         connection->doneListOk = 0;
582         return;
583       }
584       connection->buflen += readed;
585       connection->buffer[connection->buflen] = '\0';
586     } else {
587       strncpy(connection->errorStr, "connection timeout",
588               MPD_ERRORSTR_MAX_LENGTH);
589       connection->error = MPD_ERROR_TIMEOUT;
590       connection->doneProcessing = 1;
591       connection->doneListOk = 0;
592       return;
593     }
594   }
595 
596   *rt = '\0';
597   output = connection->buffer + connection->bufstart;
598   connection->bufstart = rt - connection->buffer + 1;
599 
600   if (strcmp(output, "OK") == 0) {
601     if (connection->listOks > 0) {
602       strncpy(connection->errorStr, "expected more list_OK's",
603               MPD_ERRORSTR_MAX_LENGTH);
604       connection->error = 1;
605     }
606     connection->listOks = 0;
607     connection->doneProcessing = 1;
608     connection->doneListOk = 0;
609     return;
610   }
611 
612   if (strcmp(output, "list_OK") == 0) {
613     if (connection->listOks == 0) {
614       strncpy(connection->errorStr, "got an unexpected list_OK",
615               MPD_ERRORSTR_MAX_LENGTH);
616       connection->error = 1;
617     } else {
618       connection->doneListOk = 1;
619       connection->listOks--;
620     }
621     return;
622   }
623 
624   if (strncmp(output, "ACK", strlen("ACK")) == 0) {
625     char *test;
626     char *needle;
627     int val;
628 
629     strncpy(connection->errorStr, output, MPD_ERRORSTR_MAX_LENGTH);
630     connection->error = MPD_ERROR_ACK;
631     connection->errorCode = MPD_ACK_ERROR_UNK;
632     connection->errorAt = MPD_ERROR_AT_UNK;
633     connection->doneProcessing = 1;
634     connection->doneListOk = 0;
635 
636     needle = strchr(output, '[');
637     if (needle == nullptr) { return; }
638     val = strtol(needle + 1, &test, 10);
639     if (*test != '@') { return; }
640     connection->errorCode = val;
641     val = strtol(test + 1, &test, 10);
642     if (*test != ']') { return; }
643     connection->errorAt = val;
644     return;
645   }
646 
647   tok = strchr(output, ':');
648   if (tok == nullptr) { return; }
649   pos = tok - output;
650   value = ++tok;
651   name = output;
652   name[pos] = '\0';
653 
654   if (value[0] == ' ') {
655     connection->returnElement = mpd_newReturnElement(name, &(value[1]));
656   } else {
657     snprintf(connection->errorStr, MPD_ERRORSTR_MAX_LENGTH,
658              "error parsing: %s:%s", name, value);
659     connection->error = 1;
660   }
661 }
662 
663 void mpd_finishCommand(mpd_Connection *connection) {
664   while ((connection != nullptr) && (connection->doneProcessing == 0)) {
665     if (connection->doneListOk != 0) { connection->doneListOk = 0; }
666     mpd_getNextReturnElement(connection);
667   }
668 }
669 
670 static void mpd_finishListOkCommand(mpd_Connection *connection) {
671   while ((connection->doneProcessing == 0) && (connection->listOks != 0) &&
672          (connection->doneListOk == 0)) {
673     mpd_getNextReturnElement(connection);
674   }
675 }
676 
677 int mpd_nextListOkCommand(mpd_Connection *connection) {
678   mpd_finishListOkCommand(connection);
679   if (connection->doneProcessing == 0) { connection->doneListOk = 0; }
680   if (connection->listOks == 0 || (connection->doneProcessing != 0)) {
681     return -1;
682   }
683   return 0;
684 }
685 
686 void mpd_sendStatusCommand(mpd_Connection *connection) {
687   mpd_executeCommand(connection, "status\n");
688 }
689 
690 mpd_Status *mpd_getStatus(mpd_Connection *connection) {
691   mpd_Status *status;
692 
693   /* mpd_executeCommand(connection, "status\n");
694      if (connection->error) {
695      return nullptr;
696      } */
697 
698   if ((connection->doneProcessing != 0) ||
699       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
700     return nullptr;
701   }
702 
703   if (connection->returnElement == nullptr) {
704     mpd_getNextReturnElement(connection);
705   }
706 
707   status = static_cast<mpd_Status *>(malloc(sizeof(mpd_Status)));
708   status->volume = -1;
709   status->repeat = 0;
710   status->random = 0;
711   status->playlist = -1;
712   status->playlistLength = -1;
713   status->state = -1;
714   status->song = 0;
715   status->songid = 0;
716   status->elapsedTime = 0;
717   status->totalTime = 0;
718   status->bitRate = 0;
719   status->sampleRate = 0;
720   status->bits = 0;
721   status->channels = 0;
722   status->crossfade = -1;
723   status->error = nullptr;
724   status->updatingDb = 0;
725 
726   if (connection->error != 0) {
727     free(status);
728     return nullptr;
729   }
730   while (connection->returnElement != nullptr) {
731     mpd_ReturnElement *re = connection->returnElement;
732 
733     if (strcmp(re->name, "volume") == 0) {
734       status->volume = atoi(re->value);
735     } else if (strcmp(re->name, "repeat") == 0) {
736       status->repeat = atoi(re->value);
737     } else if (strcmp(re->name, "random") == 0) {
738       status->random = atoi(re->value);
739     } else if (strcmp(re->name, "playlist") == 0) {
740       status->playlist = strtol(re->value, nullptr, 10);
741     } else if (strcmp(re->name, "playlistlength") == 0) {
742       status->playlistLength = atoi(re->value);
743     } else if (strcmp(re->name, "bitrate") == 0) {
744       status->bitRate = atoi(re->value);
745     } else if (strcmp(re->name, "state") == 0) {
746       if (strcmp(re->value, "play") == 0) {
747         status->state = MPD_STATUS_STATE_PLAY;
748       } else if (strcmp(re->value, "stop") == 0) {
749         status->state = MPD_STATUS_STATE_STOP;
750       } else if (strcmp(re->value, "pause") == 0) {
751         status->state = MPD_STATUS_STATE_PAUSE;
752       } else {
753         status->state = MPD_STATUS_STATE_UNKNOWN;
754       }
755     } else if (strcmp(re->name, "song") == 0) {
756       status->song = atoi(re->value);
757     } else if (strcmp(re->name, "songid") == 0) {
758       status->songid = atoi(re->value);
759     } else if (strcmp(re->name, "time") == 0) {
760       char *tok = strchr(re->value, ':');
761 
762       /* the second strchr below is a safety check */
763       if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
764         /* atoi stops at the first non-[0-9] char: */
765         status->elapsedTime = atoi(re->value);
766         status->totalTime = atoi(tok + 1);
767       }
768     } else if (strcmp(re->name, "error") == 0) {
769       status->error = strndup(re->value, text_buffer_size.get(*state));
770     } else if (strcmp(re->name, "xfade") == 0) {
771       status->crossfade = atoi(re->value);
772     } else if (strcmp(re->name, "updating_db") == 0) {
773       status->updatingDb = atoi(re->value);
774     } else if (strcmp(re->name, "audio") == 0) {
775       char *tok = strchr(re->value, ':');
776 
777       if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
778         status->sampleRate = atoi(re->value);
779         status->bits = atoi(++tok);
780         tok = strchr(tok, ':');
781         if ((tok != nullptr) && (strchr(tok, 0) > (tok + 1))) {
782           status->channels = atoi(tok + 1);
783         }
784       }
785     }
786 
787     mpd_getNextReturnElement(connection);
788     if (connection->error != 0) {
789       free(status);
790       return nullptr;
791     }
792   }
793 
794   if (connection->error != 0) {
795     free(status);
796     return nullptr;
797   }
798   if (status->state < 0) {
799     strncpy(connection->errorStr, "state not found", MPD_ERRORSTR_MAX_LENGTH);
800     connection->error = 1;
801     free(status);
802     return nullptr;
803   }
804 
805   return status;
806 }
807 
808 void mpd_freeStatus(mpd_Status *status) {
809   free_and_zero(status->error);
810   free(status);
811 }
812 
813 void mpd_sendStatsCommand(mpd_Connection *connection) {
814   mpd_executeCommand(connection, "stats\n");
815 }
816 
817 mpd_Stats *mpd_getStats(mpd_Connection *connection) {
818   mpd_Stats *stats;
819 
820   /* mpd_executeCommand(connection, "stats\n");
821      if (connection->error) {
822      return nullptr;
823      } */
824 
825   if ((connection->doneProcessing != 0) ||
826       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
827     return nullptr;
828   }
829 
830   if (connection->returnElement == nullptr) {
831     mpd_getNextReturnElement(connection);
832   }
833 
834   stats = static_cast<mpd_Stats *>(malloc(sizeof(mpd_Stats)));
835   stats->numberOfArtists = 0;
836   stats->numberOfAlbums = 0;
837   stats->numberOfSongs = 0;
838   stats->uptime = 0;
839   stats->dbUpdateTime = 0;
840   stats->playTime = 0;
841   stats->dbPlayTime = 0;
842 
843   if (connection->error != 0) {
844     free(stats);
845     return nullptr;
846   }
847   while (connection->returnElement != nullptr) {
848     mpd_ReturnElement *re = connection->returnElement;
849 
850     if (strcmp(re->name, "artists") == 0) {
851       stats->numberOfArtists = atoi(re->value);
852     } else if (strcmp(re->name, "albums") == 0) {
853       stats->numberOfAlbums = atoi(re->value);
854     } else if (strcmp(re->name, "songs") == 0) {
855       stats->numberOfSongs = atoi(re->value);
856     } else if (strcmp(re->name, "uptime") == 0) {
857       stats->uptime = strtol(re->value, nullptr, 10);
858     } else if (strcmp(re->name, "db_update") == 0) {
859       stats->dbUpdateTime = strtol(re->value, nullptr, 10);
860     } else if (strcmp(re->name, "playtime") == 0) {
861       stats->playTime = strtol(re->value, nullptr, 10);
862     } else if (strcmp(re->name, "db_playtime") == 0) {
863       stats->dbPlayTime = strtol(re->value, nullptr, 10);
864     }
865 
866     mpd_getNextReturnElement(connection);
867     if (connection->error != 0) {
868       free(stats);
869       return nullptr;
870     }
871   }
872 
873   if (connection->error != 0) {
874     free(stats);
875     return nullptr;
876   }
877 
878   return stats;
879 }
880 
881 void mpd_freeStats(mpd_Stats *stats) { free(stats); }
882 
883 mpd_SearchStats *mpd_getSearchStats(mpd_Connection *connection) {
884   mpd_SearchStats *stats;
885   mpd_ReturnElement *re;
886 
887   if ((connection->doneProcessing != 0) ||
888       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
889     return nullptr;
890   }
891 
892   if (connection->returnElement == nullptr) {
893     mpd_getNextReturnElement(connection);
894   }
895 
896   if (connection->error != 0) { return nullptr; }
897 
898   stats = static_cast<mpd_SearchStats *>(malloc(sizeof(mpd_SearchStats)));
899   stats->numberOfSongs = 0;
900   stats->playTime = 0;
901 
902   while (connection->returnElement != nullptr) {
903     re = connection->returnElement;
904 
905     if (strcmp(re->name, "songs") == 0) {
906       stats->numberOfSongs = atoi(re->value);
907     } else if (strcmp(re->name, "playtime") == 0) {
908       stats->playTime = strtol(re->value, nullptr, 10);
909     }
910 
911     mpd_getNextReturnElement(connection);
912     if (connection->error != 0) {
913       free(stats);
914       return nullptr;
915     }
916   }
917 
918   if (connection->error != 0) {
919     free(stats);
920     return nullptr;
921   }
922 
923   return stats;
924 }
925 
926 void mpd_freeSearchStats(mpd_SearchStats *stats) { free(stats); }
927 
928 static void mpd_initSong(mpd_Song *song) {
929   song->file = nullptr;
930   song->artist = nullptr;
931   song->albumartist = nullptr;
932   song->album = nullptr;
933   song->track = nullptr;
934   song->title = nullptr;
935   song->name = nullptr;
936   song->date = nullptr;
937   /* added by Qball */
938   song->genre = nullptr;
939   song->composer = nullptr;
940   song->performer = nullptr;
941   song->disc = nullptr;
942   song->comment = nullptr;
943 
944   song->time = MPD_SONG_NO_TIME;
945   song->pos = MPD_SONG_NO_NUM;
946   song->id = MPD_SONG_NO_ID;
947 }
948 
949 static void mpd_finishSong(mpd_Song *song) {
950   free_and_zero(song->file);
951   free_and_zero(song->artist);
952   free_and_zero(song->albumartist);
953   free_and_zero(song->album);
954   free_and_zero(song->title);
955   free_and_zero(song->track);
956   free_and_zero(song->name);
957   free_and_zero(song->date);
958   free_and_zero(song->genre);
959   free_and_zero(song->composer);
960   free_and_zero(song->disc);
961   free_and_zero(song->comment);
962 }
963 
964 mpd_Song *mpd_newSong() {
965   auto *ret = static_cast<mpd_Song *>(malloc(sizeof(mpd_Song)));
966 
967   mpd_initSong(ret);
968 
969   return ret;
970 }
971 
972 void mpd_freeSong(mpd_Song *song) {
973   mpd_finishSong(song);
974   free(song);
975 }
976 
977 mpd_Song *mpd_songDup(mpd_Song *song) {
978   mpd_Song *ret = mpd_newSong();
979 
980   if (song->file != nullptr) {
981     ret->file = strndup(song->file, text_buffer_size.get(*state));
982   }
983   if (song->artist != nullptr) {
984     ret->artist = strndup(song->artist, text_buffer_size.get(*state));
985   }
986   if (song->albumartist != nullptr) {
987     ret->artist = strndup(song->albumartist, text_buffer_size.get(*state));
988   }
989   if (song->album != nullptr) {
990     ret->album = strndup(song->album, text_buffer_size.get(*state));
991   }
992   if (song->title != nullptr) {
993     ret->title = strndup(song->title, text_buffer_size.get(*state));
994   }
995   if (song->track != nullptr) {
996     ret->track = strndup(song->track, text_buffer_size.get(*state));
997   }
998   if (song->name != nullptr) {
999     ret->name = strndup(song->name, text_buffer_size.get(*state));
1000   }
1001   if (song->date != nullptr) {
1002     ret->date = strndup(song->date, text_buffer_size.get(*state));
1003   }
1004   if (song->genre != nullptr) {
1005     ret->genre = strndup(song->genre, text_buffer_size.get(*state));
1006   }
1007   if (song->composer != nullptr) {
1008     ret->composer = strndup(song->composer, text_buffer_size.get(*state));
1009   }
1010   if (song->disc != nullptr) {
1011     ret->disc = strndup(song->disc, text_buffer_size.get(*state));
1012   }
1013   if (song->comment != nullptr) {
1014     ret->comment = strndup(song->comment, text_buffer_size.get(*state));
1015   }
1016   ret->time = song->time;
1017   ret->pos = song->pos;
1018   ret->id = song->id;
1019 
1020   return ret;
1021 }
1022 
1023 static void mpd_initDirectory(mpd_Directory *directory) {
1024   directory->path = nullptr;
1025 }
1026 
1027 static void mpd_finishDirectory(mpd_Directory *directory) {
1028   free_and_zero(directory->path);
1029 }
1030 
1031 mpd_Directory *mpd_newDirectory() {
1032   auto *directory = static_cast<mpd_Directory *>(malloc(sizeof(mpd_Directory)));
1033 
1034   mpd_initDirectory(directory);
1035 
1036   return directory;
1037 }
1038 
1039 void mpd_freeDirectory(mpd_Directory *directory) {
1040   mpd_finishDirectory(directory);
1041 
1042   free(directory);
1043 }
1044 
1045 mpd_Directory *mpd_directoryDup(mpd_Directory *directory) {
1046   mpd_Directory *ret = mpd_newDirectory();
1047 
1048   if (directory->path != nullptr) {
1049     ret->path = strndup(directory->path, text_buffer_size.get(*state));
1050   }
1051 
1052   return ret;
1053 }
1054 
1055 static void mpd_initPlaylistFile(mpd_PlaylistFile *playlist) {
1056   playlist->path = nullptr;
1057 }
1058 
1059 static void mpd_finishPlaylistFile(mpd_PlaylistFile *playlist) {
1060   free_and_zero(playlist->path);
1061 }
1062 
1063 mpd_PlaylistFile *mpd_newPlaylistFile() {
1064   auto *playlist =
1065       static_cast<mpd_PlaylistFile *>(malloc(sizeof(mpd_PlaylistFile)));
1066 
1067   mpd_initPlaylistFile(playlist);
1068 
1069   return playlist;
1070 }
1071 
1072 void mpd_freePlaylistFile(mpd_PlaylistFile *playlist) {
1073   mpd_finishPlaylistFile(playlist);
1074   free(playlist);
1075 }
1076 
1077 mpd_PlaylistFile *mpd_playlistFileDup(mpd_PlaylistFile *playlist) {
1078   mpd_PlaylistFile *ret = mpd_newPlaylistFile();
1079 
1080   if (playlist->path != nullptr) {
1081     ret->path = strndup(playlist->path, text_buffer_size.get(*state));
1082   }
1083 
1084   return ret;
1085 }
1086 
1087 static void mpd_initInfoEntity(mpd_InfoEntity *entity) {
1088   entity->info.directory = nullptr;
1089 }
1090 
1091 static void mpd_finishInfoEntity(mpd_InfoEntity *entity) {
1092   if (entity->info.directory != nullptr) {
1093     if (entity->type == MPD_INFO_ENTITY_TYPE_DIRECTORY) {
1094       mpd_freeDirectory(entity->info.directory);
1095     } else if (entity->type == MPD_INFO_ENTITY_TYPE_SONG) {
1096       mpd_freeSong(entity->info.song);
1097     } else if (entity->type == MPD_INFO_ENTITY_TYPE_PLAYLISTFILE) {
1098       mpd_freePlaylistFile(entity->info.playlistFile);
1099     }
1100   }
1101 }
1102 
1103 mpd_InfoEntity *mpd_newInfoEntity() {
1104   auto *entity = static_cast<mpd_InfoEntity *>(malloc(sizeof(mpd_InfoEntity)));
1105 
1106   mpd_initInfoEntity(entity);
1107 
1108   return entity;
1109 }
1110 
1111 void mpd_freeInfoEntity(mpd_InfoEntity *entity) {
1112   mpd_finishInfoEntity(entity);
1113   free(entity);
1114 }
1115 
1116 static void mpd_sendInfoCommand(mpd_Connection *connection, char *command) {
1117   mpd_executeCommand(connection, command);
1118 }
1119 
1120 mpd_InfoEntity *mpd_getNextInfoEntity(mpd_Connection *connection) {
1121   mpd_InfoEntity *entity = nullptr;
1122 
1123   if ((connection->doneProcessing != 0) ||
1124       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
1125     return nullptr;
1126   }
1127 
1128   if (connection->returnElement == nullptr) {
1129     mpd_getNextReturnElement(connection);
1130   }
1131 
1132   if (connection->returnElement != nullptr) {
1133     if (strcmp(connection->returnElement->name, "file") == 0) {
1134       entity = mpd_newInfoEntity();
1135       entity->type = MPD_INFO_ENTITY_TYPE_SONG;
1136       entity->info.song = mpd_newSong();
1137       entity->info.song->file = strndup(connection->returnElement->value,
1138                                         text_buffer_size.get(*state));
1139     } else if (strcmp(connection->returnElement->name, "directory") == 0) {
1140       entity = mpd_newInfoEntity();
1141       entity->type = MPD_INFO_ENTITY_TYPE_DIRECTORY;
1142       entity->info.directory = mpd_newDirectory();
1143       entity->info.directory->path = strndup(connection->returnElement->value,
1144                                              text_buffer_size.get(*state));
1145     } else if (strcmp(connection->returnElement->name, "playlist") == 0) {
1146       entity = mpd_newInfoEntity();
1147       entity->type = MPD_INFO_ENTITY_TYPE_PLAYLISTFILE;
1148       entity->info.playlistFile = mpd_newPlaylistFile();
1149       entity->info.playlistFile->path = strndup(
1150           connection->returnElement->value, text_buffer_size.get(*state));
1151     } else if (strcmp(connection->returnElement->name, "cpos") == 0) {
1152       entity = mpd_newInfoEntity();
1153       entity->type = MPD_INFO_ENTITY_TYPE_SONG;
1154       entity->info.song = mpd_newSong();
1155       entity->info.song->pos = atoi(connection->returnElement->value);
1156     } else {
1157       connection->error = 1;
1158       strncpy(connection->errorStr, "problem parsing song info",
1159               MPD_ERRORSTR_MAX_LENGTH);
1160       return nullptr;
1161     }
1162   } else {
1163     return nullptr;
1164   }
1165 
1166   mpd_getNextReturnElement(connection);
1167   while (connection->returnElement != nullptr) {
1168     mpd_ReturnElement *re = connection->returnElement;
1169 
1170     if (strcmp(re->name, "file") == 0) { return entity; }
1171     if (strcmp(re->name, "directory") == 0) { return entity; }
1172     if (strcmp(re->name, "playlist") == 0) { return entity; }
1173     if (strcmp(re->name, "cpos") == 0) { return entity; }
1174 
1175     if (entity->type == MPD_INFO_ENTITY_TYPE_SONG &&
1176         (strlen(re->value) != 0u)) {
1177       if ((entity->info.song->artist == nullptr) &&
1178           strcmp(re->name, "Artist") == 0) {
1179         entity->info.song->artist =
1180             strndup(re->value, text_buffer_size.get(*state));
1181       } else if ((entity->info.song->albumartist == nullptr) &&
1182                  strcmp(re->name, "AlbumArtist") == 0) {
1183         entity->info.song->albumartist =
1184             strndup(re->value, text_buffer_size.get(*state));
1185       } else if ((entity->info.song->album == nullptr) &&
1186                  strcmp(re->name, "Album") == 0) {
1187         entity->info.song->album =
1188             strndup(re->value, text_buffer_size.get(*state));
1189       } else if ((entity->info.song->title == nullptr) &&
1190                  strcmp(re->name, "Title") == 0) {
1191         entity->info.song->title =
1192             strndup(re->value, text_buffer_size.get(*state));
1193       } else if ((entity->info.song->track == nullptr) &&
1194                  strcmp(re->name, "Track") == 0) {
1195         entity->info.song->track =
1196             strndup(re->value, text_buffer_size.get(*state));
1197       } else if ((entity->info.song->name == nullptr) &&
1198                  strcmp(re->name, "Name") == 0) {
1199         entity->info.song->name =
1200             strndup(re->value, text_buffer_size.get(*state));
1201       } else if (entity->info.song->time == MPD_SONG_NO_TIME &&
1202                  strcmp(re->name, "Time") == 0) {
1203         entity->info.song->time = atoi(re->value);
1204       } else if (entity->info.song->pos == MPD_SONG_NO_NUM &&
1205                  strcmp(re->name, "Pos") == 0) {
1206         entity->info.song->pos = atoi(re->value);
1207       } else if (entity->info.song->id == MPD_SONG_NO_ID &&
1208                  strcmp(re->name, "Id") == 0) {
1209         entity->info.song->id = atoi(re->value);
1210       } else if ((entity->info.song->date == nullptr) &&
1211                  strcmp(re->name, "Date") == 0) {
1212         entity->info.song->date =
1213             strndup(re->value, text_buffer_size.get(*state));
1214       } else if ((entity->info.song->genre == nullptr) &&
1215                  strcmp(re->name, "Genre") == 0) {
1216         entity->info.song->genre =
1217             strndup(re->value, text_buffer_size.get(*state));
1218       } else if ((entity->info.song->composer == nullptr) &&
1219                  strcmp(re->name, "Composer") == 0) {
1220         entity->info.song->composer =
1221             strndup(re->value, text_buffer_size.get(*state));
1222       } else if ((entity->info.song->performer == nullptr) &&
1223                  strcmp(re->name, "Performer") == 0) {
1224         entity->info.song->performer =
1225             strndup(re->value, text_buffer_size.get(*state));
1226       } else if ((entity->info.song->disc == nullptr) &&
1227                  strcmp(re->name, "Disc") == 0) {
1228         entity->info.song->disc =
1229             strndup(re->value, text_buffer_size.get(*state));
1230       } else if ((entity->info.song->comment == nullptr) &&
1231                  strcmp(re->name, "Comment") == 0) {
1232         entity->info.song->comment =
1233             strndup(re->value, text_buffer_size.get(*state));
1234       }
1235     } else if (entity->type == MPD_INFO_ENTITY_TYPE_DIRECTORY) {
1236     } else if (entity->type == MPD_INFO_ENTITY_TYPE_PLAYLISTFILE) {
1237     }
1238 
1239     mpd_getNextReturnElement(connection);
1240   }
1241 
1242   return entity;
1243 }
1244 
1245 static char *mpd_getNextReturnElementNamed(mpd_Connection *connection,
1246                                            const char *name) {
1247   if ((connection->doneProcessing != 0) ||
1248       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
1249     return nullptr;
1250   }
1251 
1252   mpd_getNextReturnElement(connection);
1253   while (connection->returnElement != nullptr) {
1254     mpd_ReturnElement *re = connection->returnElement;
1255 
1256     if (strcmp(re->name, name) == 0) {
1257       return strndup(re->value, text_buffer_size.get(*state));
1258     }
1259     mpd_getNextReturnElement(connection);
1260   }
1261 
1262   return nullptr;
1263 }
1264 
1265 char *mpd_getNextTag(mpd_Connection *connection, int type) {
1266   if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES ||
1267       type == MPD_TAG_ITEM_ANY) {
1268     return nullptr;
1269   }
1270   if (type == MPD_TAG_ITEM_FILENAME) {
1271     return mpd_getNextReturnElementNamed(connection, "file");
1272   }
1273   return mpd_getNextReturnElementNamed(connection, mpdTagItemKeys[type]);
1274 }
1275 
1276 char *mpd_getNextArtist(mpd_Connection *connection) {
1277   return mpd_getNextReturnElementNamed(connection, "Artist");
1278 }
1279 
1280 char *mpd_getNextAlbum(mpd_Connection *connection) {
1281   return mpd_getNextReturnElementNamed(connection, "Album");
1282 }
1283 
1284 void mpd_sendPlaylistInfoCommand(mpd_Connection *connection, int songPos) {
1285   int len = strlen("playlistinfo") + 2 + INTLEN + 3;
1286   auto *string = static_cast<char *>(malloc(len));
1287 
1288   snprintf(string, len, "playlistinfo \"%i\"\n", songPos);
1289   mpd_sendInfoCommand(connection, string);
1290   free(string);
1291 }
1292 
1293 void mpd_sendPlaylistIdCommand(mpd_Connection *connection, int id) {
1294   int len = strlen("playlistid") + 2 + INTLEN + 3;
1295   auto *string = static_cast<char *>(malloc(len));
1296 
1297   snprintf(string, len, "playlistid \"%i\"\n", id);
1298   mpd_sendInfoCommand(connection, string);
1299   free(string);
1300 }
1301 
1302 void mpd_sendPlChangesCommand(mpd_Connection *connection, long long playlist) {
1303   int len = strlen("plchanges") + 2 + LONGLONGLEN + 3;
1304   auto *string = static_cast<char *>(malloc(len));
1305 
1306   snprintf(string, len, "plchanges \"%lld\"\n", playlist);
1307   mpd_sendInfoCommand(connection, string);
1308   free(string);
1309 }
1310 
1311 void mpd_sendPlChangesPosIdCommand(mpd_Connection *connection,
1312                                    long long playlist) {
1313   int len = strlen("plchangesposid") + 2 + LONGLONGLEN + 3;
1314   auto *string = static_cast<char *>(malloc(len));
1315 
1316   snprintf(string, len, "plchangesposid \"%lld\"\n", playlist);
1317   mpd_sendInfoCommand(connection, string);
1318   free(string);
1319 }
1320 
1321 void mpd_sendListallCommand(mpd_Connection *connection, const char *dir) {
1322   char *sDir = mpd_sanitizeArg(dir);
1323   int len = strlen("listall") + 2 + strlen(sDir) + 3;
1324   auto *string = static_cast<char *>(malloc(len));
1325 
1326   snprintf(string, len, "listall \"%s\"\n", sDir);
1327   mpd_sendInfoCommand(connection, string);
1328   free(string);
1329   free(sDir);
1330 }
1331 
1332 void mpd_sendListallInfoCommand(mpd_Connection *connection, const char *dir) {
1333   char *sDir = mpd_sanitizeArg(dir);
1334   int len = strlen("listallinfo") + 2 + strlen(sDir) + 3;
1335   auto *string = static_cast<char *>(malloc(len));
1336 
1337   snprintf(string, len, "listallinfo \"%s\"\n", sDir);
1338   mpd_sendInfoCommand(connection, string);
1339   free(string);
1340   free(sDir);
1341 }
1342 
1343 void mpd_sendLsInfoCommand(mpd_Connection *connection, const char *dir) {
1344   char *sDir = mpd_sanitizeArg(dir);
1345   int len = strlen("lsinfo") + 2 + strlen(sDir) + 3;
1346   auto *string = static_cast<char *>(malloc(len));
1347 
1348   snprintf(string, len, "lsinfo \"%s\"\n", sDir);
1349   mpd_sendInfoCommand(connection, string);
1350   free(string);
1351   free(sDir);
1352 }
1353 
1354 void mpd_sendCurrentSongCommand(mpd_Connection *connection) {
1355   mpd_executeCommand(connection, "currentsong\n");
1356 }
1357 
1358 void mpd_sendSearchCommand(mpd_Connection *connection, int table,
1359                            const char *str) {
1360   mpd_startSearch(connection, 0);
1361   mpd_addConstraintSearch(connection, table, str);
1362   mpd_commitSearch(connection);
1363 }
1364 
1365 void mpd_sendFindCommand(mpd_Connection *connection, int table,
1366                          const char *str) {
1367   mpd_startSearch(connection, 1);
1368   mpd_addConstraintSearch(connection, table, str);
1369   mpd_commitSearch(connection);
1370 }
1371 
1372 void mpd_sendListCommand(mpd_Connection *connection, int table,
1373                          const char *arg1) {
1374   char st[7];
1375   int len;
1376   char *string;
1377 
1378   if (table == MPD_TABLE_ARTIST) {
1379     strncpy(st, "artist", strlen("artist") + 1);
1380   } else if (table == MPD_TABLE_ALBUM) {
1381     strncpy(st, "album", strlen("album") + 1);
1382   } else {
1383     connection->error = 1;
1384     strncpy(connection->errorStr, "unknown table for list",
1385             MPD_ERRORSTR_MAX_LENGTH);
1386     return;
1387   }
1388   if (arg1 != nullptr) {
1389     char *sanitArg1 = mpd_sanitizeArg(arg1);
1390 
1391     len = strlen("list") + 1 + strlen(sanitArg1) + 2 + strlen(st) + 3;
1392     string = static_cast<char *>(malloc(len));
1393     snprintf(string, len, "list %s \"%s\"\n", st, sanitArg1);
1394     free(sanitArg1);
1395   } else {
1396     len = strlen("list") + 1 + strlen(st) + 2;
1397     string = static_cast<char *>(malloc(len));
1398     snprintf(string, len, "list %s\n", st);
1399   }
1400   mpd_sendInfoCommand(connection, string);
1401   free(string);
1402 }
1403 
1404 void mpd_sendAddCommand(mpd_Connection *connection, const char *file) {
1405   char *sFile = mpd_sanitizeArg(file);
1406   int len = strlen("add") + 2 + strlen(sFile) + 3;
1407   auto *string = static_cast<char *>(malloc(len));
1408 
1409   snprintf(string, len, "add \"%s\"\n", sFile);
1410   mpd_executeCommand(connection, string);
1411   free(string);
1412   free(sFile);
1413 }
1414 
1415 int mpd_sendAddIdCommand(mpd_Connection *connection, const char *file) {
1416   int retval = -1;
1417   char *sFile = mpd_sanitizeArg(file);
1418   int len = strlen("addid") + 2 + strlen(sFile) + 3;
1419   auto *string = static_cast<char *>(malloc(len));
1420 
1421   snprintf(string, len, "addid \"%s\"\n", sFile);
1422   mpd_sendInfoCommand(connection, string);
1423   free(string);
1424   free(sFile);
1425 
1426   string = mpd_getNextReturnElementNamed(connection, "Id");
1427   if (string != nullptr) {
1428     retval = atoi(string);
1429     free(string);
1430   }
1431 
1432   return retval;
1433 }
1434 
1435 void mpd_sendDeleteCommand(mpd_Connection *connection, int songPos) {
1436   int len = strlen("delete") + 2 + INTLEN + 3;
1437   auto *string = static_cast<char *>(malloc(len));
1438 
1439   snprintf(string, len, "delete \"%i\"\n", songPos);
1440   mpd_sendInfoCommand(connection, string);
1441   free(string);
1442 }
1443 
1444 void mpd_sendDeleteIdCommand(mpd_Connection *connection, int id) {
1445   int len = strlen("deleteid") + 2 + INTLEN + 3;
1446   auto *string = static_cast<char *>(malloc(len));
1447 
1448   snprintf(string, len, "deleteid \"%i\"\n", id);
1449   mpd_sendInfoCommand(connection, string);
1450   free(string);
1451 }
1452 
1453 void mpd_sendSaveCommand(mpd_Connection *connection, const char *name) {
1454   char *sName = mpd_sanitizeArg(name);
1455   int len = strlen("save") + 2 + strlen(sName) + 3;
1456   auto *string = static_cast<char *>(malloc(len));
1457 
1458   snprintf(string, len, "save \"%s\"\n", sName);
1459   mpd_executeCommand(connection, string);
1460   free(string);
1461   free(sName);
1462 }
1463 
1464 void mpd_sendLoadCommand(mpd_Connection *connection, const char *name) {
1465   char *sName = mpd_sanitizeArg(name);
1466   int len = strlen("load") + 2 + strlen(sName) + 3;
1467   auto *string = static_cast<char *>(malloc(len));
1468 
1469   snprintf(string, len, "load \"%s\"\n", sName);
1470   mpd_executeCommand(connection, string);
1471   free(string);
1472   free(sName);
1473 }
1474 
1475 void mpd_sendRmCommand(mpd_Connection *connection, const char *name) {
1476   char *sName = mpd_sanitizeArg(name);
1477   int len = strlen("rm") + 2 + strlen(sName) + 3;
1478   auto *string = static_cast<char *>(malloc(len));
1479 
1480   snprintf(string, len, "rm \"%s\"\n", sName);
1481   mpd_executeCommand(connection, string);
1482   free(string);
1483   free(sName);
1484 }
1485 
1486 void mpd_sendRenameCommand(mpd_Connection *connection, const char *from,
1487                            const char *to) {
1488   char *sFrom = mpd_sanitizeArg(from);
1489   char *sTo = mpd_sanitizeArg(to);
1490   int len = strlen("rename") + 2 + strlen(sFrom) + 3 + strlen(sTo) + 3;
1491   auto *string = static_cast<char *>(malloc(len));
1492 
1493   snprintf(string, len, "rename \"%s\" \"%s\"\n", sFrom, sTo);
1494   mpd_executeCommand(connection, string);
1495   free(string);
1496   free(sFrom);
1497   free(sTo);
1498 }
1499 
1500 void mpd_sendShuffleCommand(mpd_Connection *connection) {
1501   mpd_executeCommand(connection, "shuffle\n");
1502 }
1503 
1504 void mpd_sendClearCommand(mpd_Connection *connection) {
1505   mpd_executeCommand(connection, "clear\n");
1506 }
1507 
1508 void mpd_sendPlayCommand(mpd_Connection *connection, int songPos) {
1509   int len = strlen("play") + 2 + INTLEN + 3;
1510   auto *string = static_cast<char *>(malloc(len));
1511 
1512   snprintf(string, len, "play \"%i\"\n", songPos);
1513   mpd_sendInfoCommand(connection, string);
1514   free(string);
1515 }
1516 
1517 void mpd_sendPlayIdCommand(mpd_Connection *connection, int id) {
1518   int len = strlen("playid") + 2 + INTLEN + 3;
1519   auto *string = static_cast<char *>(malloc(len));
1520 
1521   snprintf(string, len, "playid \"%i\"\n", id);
1522   mpd_sendInfoCommand(connection, string);
1523   free(string);
1524 }
1525 
1526 void mpd_sendStopCommand(mpd_Connection *connection) {
1527   mpd_executeCommand(connection, "stop\n");
1528 }
1529 
1530 void mpd_sendPauseCommand(mpd_Connection *connection, int pauseMode) {
1531   int len = strlen("pause") + 2 + INTLEN + 3;
1532   auto *string = static_cast<char *>(malloc(len));
1533 
1534   snprintf(string, len, "pause \"%i\"\n", pauseMode);
1535   mpd_executeCommand(connection, string);
1536   free(string);
1537 }
1538 
1539 void mpd_sendNextCommand(mpd_Connection *connection) {
1540   mpd_executeCommand(connection, "next\n");
1541 }
1542 
1543 void mpd_sendMoveCommand(mpd_Connection *connection, int from, int to) {
1544   int len = strlen("move") + 2 + INTLEN + 3 + INTLEN + 3;
1545   auto *string = static_cast<char *>(malloc(len));
1546 
1547   snprintf(string, len, "move \"%i\" \"%i\"\n", from, to);
1548   mpd_sendInfoCommand(connection, string);
1549   free(string);
1550 }
1551 
1552 void mpd_sendMoveIdCommand(mpd_Connection *connection, int id, int to) {
1553   int len = strlen("moveid") + 2 + INTLEN + 3 + INTLEN + 3;
1554   auto *string = static_cast<char *>(malloc(len));
1555 
1556   snprintf(string, len, "moveid \"%i\" \"%i\"\n", id, to);
1557   mpd_sendInfoCommand(connection, string);
1558   free(string);
1559 }
1560 
1561 void mpd_sendSwapCommand(mpd_Connection *connection, int song1, int song2) {
1562   int len = strlen("swap") + 2 + INTLEN + 3 + INTLEN + 3;
1563   auto *string = static_cast<char *>(malloc(len));
1564 
1565   snprintf(string, len, "swap \"%i\" \"%i\"\n", song1, song2);
1566   mpd_sendInfoCommand(connection, string);
1567   free(string);
1568 }
1569 
1570 void mpd_sendSwapIdCommand(mpd_Connection *connection, int id1, int id2) {
1571   int len = strlen("swapid") + 2 + INTLEN + 3 + INTLEN + 3;
1572   auto *string = static_cast<char *>(malloc(len));
1573 
1574   snprintf(string, len, "swapid \"%i\" \"%i\"\n", id1, id2);
1575   mpd_sendInfoCommand(connection, string);
1576   free(string);
1577 }
1578 
1579 void mpd_sendSeekCommand(mpd_Connection *connection, int song, int seek_time) {
1580   int len = strlen("seek") + 2 + INTLEN + 3 + INTLEN + 3;
1581   auto *string = static_cast<char *>(malloc(len));
1582 
1583   snprintf(string, len, "seek \"%i\" \"%i\"\n", song, seek_time);
1584   mpd_sendInfoCommand(connection, string);
1585   free(string);
1586 }
1587 
1588 void mpd_sendSeekIdCommand(mpd_Connection *connection, int id, int seek_time) {
1589   int len = strlen("seekid") + 2 + INTLEN + 3 + INTLEN + 3;
1590   auto *string = static_cast<char *>(malloc(len));
1591 
1592   snprintf(string, len, "seekid \"%i\" \"%i\"\n", id, seek_time);
1593   mpd_sendInfoCommand(connection, string);
1594   free(string);
1595 }
1596 
1597 void mpd_sendUpdateCommand(mpd_Connection *connection, char *path) {
1598   char *sPath = mpd_sanitizeArg(path);
1599   int len = strlen("update") + 2 + strlen(sPath) + 3;
1600   auto *string = static_cast<char *>(malloc(len));
1601 
1602   snprintf(string, len, "update \"%s\"\n", sPath);
1603   mpd_sendInfoCommand(connection, string);
1604   free(string);
1605   free(sPath);
1606 }
1607 
1608 int mpd_getUpdateId(mpd_Connection *connection) {
1609   char *jobid;
1610   int ret = 0;
1611 
1612   jobid = mpd_getNextReturnElementNamed(connection, "updating_db");
1613   if (jobid != nullptr) {
1614     ret = atoi(jobid);
1615     free(jobid);
1616   }
1617 
1618   return ret;
1619 }
1620 
1621 void mpd_sendPrevCommand(mpd_Connection *connection) {
1622   mpd_executeCommand(connection, "previous\n");
1623 }
1624 
1625 void mpd_sendRepeatCommand(mpd_Connection *connection, int repeatMode) {
1626   int len = strlen("repeat") + 2 + INTLEN + 3;
1627   auto *string = static_cast<char *>(malloc(len));
1628 
1629   snprintf(string, len, "repeat \"%i\"\n", repeatMode);
1630   mpd_executeCommand(connection, string);
1631   free(string);
1632 }
1633 
1634 void mpd_sendRandomCommand(mpd_Connection *connection, int randomMode) {
1635   int len = strlen("random") + 2 + INTLEN + 3;
1636   auto *string = static_cast<char *>(malloc(len));
1637 
1638   snprintf(string, len, "random \"%i\"\n", randomMode);
1639   mpd_executeCommand(connection, string);
1640   free(string);
1641 }
1642 
1643 void mpd_sendSetvolCommand(mpd_Connection *connection, int volumeChange) {
1644   int len = strlen("setvol") + 2 + INTLEN + 3;
1645   auto *string = static_cast<char *>(malloc(len));
1646 
1647   snprintf(string, len, "setvol \"%i\"\n", volumeChange);
1648   mpd_executeCommand(connection, string);
1649   free(string);
1650 }
1651 
1652 void mpd_sendVolumeCommand(mpd_Connection *connection, int volumeChange) {
1653   int len = strlen("volume") + 2 + INTLEN + 3;
1654   auto *string = static_cast<char *>(malloc(len));
1655 
1656   snprintf(string, len, "volume \"%i\"\n", volumeChange);
1657   mpd_executeCommand(connection, string);
1658   free(string);
1659 }
1660 
1661 void mpd_sendCrossfadeCommand(mpd_Connection *connection, int seconds) {
1662   int len = strlen("crossfade") + 2 + INTLEN + 3;
1663   auto *string = static_cast<char *>(malloc(len));
1664 
1665   snprintf(string, len, "crossfade \"%i\"\n", seconds);
1666   mpd_executeCommand(connection, string);
1667   free(string);
1668 }
1669 
1670 void mpd_sendPasswordCommand(mpd_Connection *connection, const char *pass) {
1671   char *sPass = mpd_sanitizeArg(pass);
1672   int len = strlen("password") + 2 + strlen(sPass) + 3;
1673   auto *string = static_cast<char *>(malloc(len));
1674 
1675   snprintf(string, len, "password \"%s\"\n", sPass);
1676   mpd_executeCommand(connection, string);
1677   free(string);
1678   free(sPass);
1679 }
1680 
1681 void mpd_sendCommandListBegin(mpd_Connection *connection) {
1682   if (connection->commandList != 0) {
1683     strncpy(connection->errorStr, "already in command list mode",
1684             MPD_ERRORSTR_MAX_LENGTH);
1685     connection->error = 1;
1686     return;
1687   }
1688   connection->commandList = COMMAND_LIST;
1689   mpd_executeCommand(connection, "command_list_begin\n");
1690 }
1691 
1692 void mpd_sendCommandListOkBegin(mpd_Connection *connection) {
1693   if (connection->commandList != 0) {
1694     strncpy(connection->errorStr, "already in command list mode",
1695             MPD_ERRORSTR_MAX_LENGTH);
1696     connection->error = 1;
1697     return;
1698   }
1699   connection->commandList = COMMAND_LIST_OK;
1700   mpd_executeCommand(connection, "command_list_ok_begin\n");
1701   connection->listOks = 0;
1702 }
1703 
1704 void mpd_sendCommandListEnd(mpd_Connection *connection) {
1705   if (connection->commandList == 0) {
1706     strncpy(connection->errorStr, "not in command list mode",
1707             MPD_ERRORSTR_MAX_LENGTH);
1708     connection->error = 1;
1709     return;
1710   }
1711   connection->commandList = 0;
1712   mpd_executeCommand(connection, "command_list_end\n");
1713 }
1714 
1715 void mpd_sendOutputsCommand(mpd_Connection *connection) {
1716   mpd_executeCommand(connection, "outputs\n");
1717 }
1718 
1719 mpd_OutputEntity *mpd_getNextOutput(mpd_Connection *connection) {
1720   mpd_OutputEntity *output = nullptr;
1721 
1722   if ((connection->doneProcessing != 0) ||
1723       ((connection->listOks != 0) && (connection->doneListOk != 0))) {
1724     return nullptr;
1725   }
1726 
1727   if (connection->error != 0) { return nullptr; }
1728 
1729   output = static_cast<mpd_OutputEntity *>(malloc(sizeof(mpd_OutputEntity)));
1730   output->id = -10;
1731   output->name = nullptr;
1732   output->enabled = 0;
1733 
1734   if (connection->returnElement == nullptr) {
1735     mpd_getNextReturnElement(connection);
1736   }
1737 
1738   while (connection->returnElement != nullptr) {
1739     mpd_ReturnElement *re = connection->returnElement;
1740 
1741     if (strcmp(re->name, "outputid") == 0) {
1742       if (output != nullptr && output->id >= 0) { return output; }
1743       output->id = atoi(re->value);
1744     } else if (strcmp(re->name, "outputname") == 0) {
1745       output->name = strndup(re->value, text_buffer_size.get(*state));
1746     } else if (strcmp(re->name, "outputenabled") == 0) {
1747       output->enabled = atoi(re->value);
1748     }
1749 
1750     mpd_getNextReturnElement(connection);
1751     if (connection->error != 0) {
1752       free(output);
1753       return nullptr;
1754     }
1755   }
1756 
1757   return output;
1758 }
1759 
1760 void mpd_sendEnableOutputCommand(mpd_Connection *connection, int outputId) {
1761   int len = strlen("enableoutput") + 2 + INTLEN + 3;
1762   auto *string = static_cast<char *>(malloc(len));
1763 
1764   snprintf(string, len, "enableoutput \"%i\"\n", outputId);
1765   mpd_executeCommand(connection, string);
1766   free(string);
1767 }
1768 
1769 void mpd_sendDisableOutputCommand(mpd_Connection *connection, int outputId) {
1770   int len = strlen("disableoutput") + 2 + INTLEN + 3;
1771   auto *string = static_cast<char *>(malloc(len));
1772 
1773   snprintf(string, len, "disableoutput \"%i\"\n", outputId);
1774   mpd_executeCommand(connection, string);
1775   free(string);
1776 }
1777 
1778 void mpd_freeOutputElement(mpd_OutputEntity *output) {
1779   free(output->name);
1780   free(output);
1781 }
1782 
1783 /** odd naming, but it gets the not allowed commands */
1784 void mpd_sendNotCommandsCommand(mpd_Connection *connection) {
1785   mpd_executeCommand(connection, "notcommands\n");
1786 }
1787 
1788 /** odd naming, but it gets the allowed commands */
1789 void mpd_sendCommandsCommand(mpd_Connection *connection) {
1790   mpd_executeCommand(connection, "commands\n");
1791 }
1792 
1793 /** Get the next returned command */
1794 char *mpd_getNextCommand(mpd_Connection *connection) {
1795   return mpd_getNextReturnElementNamed(connection, "command");
1796 }
1797 
1798 void mpd_sendUrlHandlersCommand(mpd_Connection *connection) {
1799   mpd_executeCommand(connection, "urlhandlers\n");
1800 }
1801 
1802 char *mpd_getNextHandler(mpd_Connection *connection) {
1803   return mpd_getNextReturnElementNamed(connection, "handler");
1804 }
1805 
1806 void mpd_sendTagTypesCommand(mpd_Connection *connection) {
1807   mpd_executeCommand(connection, "tagtypes\n");
1808 }
1809 
1810 char *mpd_getNextTagType(mpd_Connection *connection) {
1811   return mpd_getNextReturnElementNamed(connection, "tagtype");
1812 }
1813 
1814 void mpd_startSearch(mpd_Connection *connection, int exact) {
1815   if (connection->request != nullptr) {
1816     strncpy(connection->errorStr, "search already in progress",
1817             MPD_ERRORSTR_MAX_LENGTH);
1818     connection->error = 1;
1819     return;
1820   }
1821 
1822   if (exact != 0) {
1823     connection->request = strndup("find", text_buffer_size.get(*state));
1824   } else {
1825     connection->request = strndup("search", text_buffer_size.get(*state));
1826   }
1827 }
1828 
1829 void mpd_startStatsSearch(mpd_Connection *connection) {
1830   if (connection->request != nullptr) {
1831     strncpy(connection->errorStr, "search already in progress",
1832             MPD_ERRORSTR_MAX_LENGTH);
1833     connection->error = 1;
1834     return;
1835   }
1836 
1837   connection->request = strndup("count", text_buffer_size.get(*state));
1838 }
1839 
1840 void mpd_startPlaylistSearch(mpd_Connection *connection, int exact) {
1841   if (connection->request != nullptr) {
1842     strncpy(connection->errorStr, "search already in progress",
1843             MPD_ERRORSTR_MAX_LENGTH);
1844     connection->error = 1;
1845     return;
1846   }
1847 
1848   if (exact != 0) {
1849     connection->request = strndup("playlistfind", text_buffer_size.get(*state));
1850   } else {
1851     connection->request =
1852         strndup("playlistsearch", text_buffer_size.get(*state));
1853   }
1854 }
1855 
1856 void mpd_startFieldSearch(mpd_Connection *connection, int type) {
1857   const char *strtype;
1858   int len;
1859 
1860   if (connection->request != nullptr) {
1861     strncpy(connection->errorStr, "search already in progress",
1862             MPD_ERRORSTR_MAX_LENGTH);
1863     connection->error = 1;
1864     return;
1865   }
1866 
1867   if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES) {
1868     strncpy(connection->errorStr, "invalid type specified",
1869             MPD_ERRORSTR_MAX_LENGTH);
1870     connection->error = 1;
1871     return;
1872   }
1873 
1874   strtype = mpdTagItemKeys[type];
1875 
1876   len = 5 + strlen(strtype) + 1;
1877   connection->request = static_cast<char *>(malloc(len));
1878 
1879   snprintf(connection->request, len, "list %c%s",
1880            tolower(static_cast<unsigned char>(strtype[0])), strtype + 1);
1881 }
1882 
1883 void mpd_addConstraintSearch(mpd_Connection *connection, int type,
1884                              const char *name) {
1885   const char *strtype;
1886   char *arg;
1887   int len;
1888   char *string;
1889 
1890   if (connection->request == nullptr) {
1891     strncpy(connection->errorStr, "no search in progress",
1892             MPD_ERRORSTR_MAX_LENGTH);
1893     connection->error = 1;
1894     return;
1895   }
1896 
1897   if (type < 0 || type >= MPD_TAG_NUM_OF_ITEM_TYPES) {
1898     strncpy(connection->errorStr, "invalid type specified",
1899             MPD_ERRORSTR_MAX_LENGTH);
1900     connection->error = 1;
1901     return;
1902   }
1903 
1904   if (name == nullptr) {
1905     strncpy(connection->errorStr, "no name specified", MPD_ERRORSTR_MAX_LENGTH);
1906     connection->error = 1;
1907     return;
1908   }
1909 
1910   string = strndup(connection->request, text_buffer_size.get(*state));
1911   strtype = mpdTagItemKeys[type];
1912   arg = mpd_sanitizeArg(name);
1913 
1914   len = strlen(string) + 1 + strlen(strtype) + 2 + strlen(arg) + 2;
1915   connection->request = static_cast<char *>(realloc(connection->request, len));
1916   snprintf(connection->request, len, "%s %c%s \"%s\"", string,
1917            tolower(static_cast<unsigned char>(strtype[0])), strtype + 1, arg);
1918 
1919   free(string);
1920   free(arg);
1921 }
1922 
1923 void mpd_commitSearch(mpd_Connection *connection) {
1924   int len;
1925 
1926   if (connection->request == nullptr) {
1927     strncpy(connection->errorStr, "no search in progress",
1928             MPD_ERRORSTR_MAX_LENGTH);
1929     connection->error = 1;
1930     return;
1931   }
1932 
1933   len = strlen(connection->request) + 2;
1934   connection->request = static_cast<char *>(realloc(connection->request, len));
1935   connection->request[len - 2] = '\n';
1936   connection->request[len - 1] = '\0';
1937   mpd_sendInfoCommand(connection, connection->request);
1938 
1939   free_and_zero(connection->request);
1940 }
1941 
1942 /**
1943  * @param connection	a MpdConnection
1944  * @param path			the path to the playlist.
1945  *
1946  * List the content, with full metadata, of a stored playlist. */
1947 void mpd_sendListPlaylistInfoCommand(mpd_Connection *connection, char *path) {
1948   char *arg = mpd_sanitizeArg(path);
1949   int len = strlen("listplaylistinfo") + 2 + strlen(arg) + 3;
1950   auto *query = static_cast<char *>(malloc(len));
1951 
1952   snprintf(query, len, "listplaylistinfo \"%s\"\n", arg);
1953   mpd_sendInfoCommand(connection, query);
1954   free(arg);
1955   free(query);
1956 }
1957 
1958 /**
1959  * @param connection	a MpdConnection
1960  * @param path			the path to the playlist.
1961  *
1962  * List the content of a stored playlist. */
1963 void mpd_sendListPlaylistCommand(mpd_Connection *connection, char *path) {
1964   char *arg = mpd_sanitizeArg(path);
1965   int len = strlen("listplaylist") + 2 + strlen(arg) + 3;
1966   auto *query = static_cast<char *>(malloc(len));
1967 
1968   snprintf(query, len, "listplaylist \"%s\"\n", arg);
1969   mpd_sendInfoCommand(connection, query);
1970   free(arg);
1971   free(query);
1972 }
1973 
1974 void mpd_sendPlaylistClearCommand(mpd_Connection *connection, char *path) {
1975   char *sPath = mpd_sanitizeArg(path);
1976   int len = strlen("playlistclear") + 2 + strlen(sPath) + 3;
1977   auto *string = static_cast<char *>(malloc(len));
1978 
1979   snprintf(string, len, "playlistclear \"%s\"\n", sPath);
1980   mpd_executeCommand(connection, string);
1981   free(sPath);
1982   free(string);
1983 }
1984 
1985 void mpd_sendPlaylistAddCommand(mpd_Connection *connection, char *playlist,
1986                                 char *path) {
1987   char *sPlaylist = mpd_sanitizeArg(playlist);
1988   char *sPath = mpd_sanitizeArg(path);
1989   int len =
1990       strlen("playlistadd") + 2 + strlen(sPlaylist) + 3 + strlen(sPath) + 3;
1991   auto *string = static_cast<char *>(malloc(len));
1992 
1993   snprintf(string, len, "playlistadd \"%s\" \"%s\"\n", sPlaylist, sPath);
1994   mpd_executeCommand(connection, string);
1995   free(sPlaylist);
1996   free(sPath);
1997   free(string);
1998 }
1999 
2000 void mpd_sendPlaylistMoveCommand(mpd_Connection *connection, char *playlist,
2001                                  int from, int to) {
2002   char *sPlaylist = mpd_sanitizeArg(playlist);
2003   int len = strlen("playlistmove") + 2 + strlen(sPlaylist) + 3 + INTLEN + 3 +
2004             INTLEN + 3;
2005   auto *string = static_cast<char *>(malloc(len));
2006 
2007   snprintf(string, len, "playlistmove \"%s\" \"%i\" \"%i\"\n", sPlaylist, from,
2008            to);
2009   mpd_executeCommand(connection, string);
2010   free(sPlaylist);
2011   free(string);
2012 }
2013 
2014 void mpd_sendPlaylistDeleteCommand(mpd_Connection *connection, char *playlist,
2015                                    int pos) {
2016   char *sPlaylist = mpd_sanitizeArg(playlist);
2017   int len = strlen("playlistdelete") + 2 + strlen(sPlaylist) + 3 + INTLEN + 3;
2018   auto *string = static_cast<char *>(malloc(len));
2019 
2020   snprintf(string, len, "playlistdelete \"%s\" \"%i\"\n", sPlaylist, pos);
2021   mpd_executeCommand(connection, string);
2022   free(sPlaylist);
2023   free(string);
2024 }
2025