1 /*****************************************************************************
2 * messages.c: messages interface
3 * This library provides an interface to the message queue to be used by other
4 * modules, especially intf modules. See config.h for output configuration.
5 *****************************************************************************
6 * Copyright (C) 1998-2002 VideoLAN
7 * $Id: messages.c,v 1.16 2002/10/22 21:10:28 sam Exp $
9 * Authors: Vincent Seguin <seguin@via.ecp.fr>
10 * Samuel Hocevar <sam@zoy.org>
12 * This program is free software; you can redistribute it and/or modify
13 * it under the terms of the GNU General Public License as published by
14 * the Free Software Foundation; either version 2 of the License, or
15 * (at your option) any later version.
17 * This program is distributed in the hope that it will be useful,
18 * but WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
20 * GNU General Public License for more details.
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
25 *****************************************************************************/
27 /*****************************************************************************
29 *****************************************************************************/
30 #include <errno.h> /* errno */
31 #include <fcntl.h> /* O_CREAT, O_TRUNC, O_WRONLY, O_SYNC */
32 #include <stdio.h> /* required */
33 #include <stdarg.h> /* va_list for BSD */
34 #include <stdlib.h> /* malloc() */
35 #include <string.h> /* strerror() */
40 #include <unistd.h> /* close(), write() */
43 #include "interface.h"
45 /*****************************************************************************
47 *****************************************************************************/
48 static void QueueMsg ( vlc_object_t *, int , const char *,
49 const char *, va_list );
50 static void FlushMsg ( msg_bank_t * );
51 static void PrintMsg ( vlc_object_t *, msg_item_t * );
54 static char *ConvertPrintfFormatString ( const char *psz_format );
57 /*****************************************************************************
58 * msg_Create: initialize messages interface
59 *****************************************************************************
60 * This functions has to be called before any call to other msg_* functions.
61 * It set up the locks and the message queue if it is used.
62 *****************************************************************************/
63 void __msg_Create( vlc_object_t *p_this )
65 /* Message queue initialization */
66 vlc_mutex_init( p_this, &p_this->p_libvlc->msg_bank.lock );
68 p_this->p_libvlc->msg_bank.b_configured = VLC_FALSE;
69 p_this->p_libvlc->msg_bank.b_overflow = VLC_FALSE;
71 p_this->p_libvlc->msg_bank.i_start = 0;
72 p_this->p_libvlc->msg_bank.i_stop = 0;
74 p_this->p_libvlc->msg_bank.i_sub = 0;
75 p_this->p_libvlc->msg_bank.pp_sub = NULL;
78 /*****************************************************************************
79 * msg_Flush: flush the message queue
80 *****************************************************************************/
81 void __msg_Flush( vlc_object_t *p_this )
85 vlc_mutex_lock( &p_this->p_libvlc->msg_bank.lock );
87 p_this->p_libvlc->msg_bank.b_configured = VLC_TRUE;
89 for( i_index = p_this->p_libvlc->msg_bank.i_start;
90 i_index != p_this->p_libvlc->msg_bank.i_stop;
91 i_index = (i_index+1) % VLC_MSG_QSIZE )
93 PrintMsg( p_this, &p_this->p_libvlc->msg_bank.msg[i_index] );
96 FlushMsg( &p_this->p_libvlc->msg_bank );
98 vlc_mutex_unlock( &p_this->p_libvlc->msg_bank.lock );
101 /*****************************************************************************
102 * msg_Destroy: free resources allocated by msg_Create
103 *****************************************************************************
104 * This functions prints all messages remaining in queue, then free all the
105 * resources allocated by msg_Create.
106 * No other messages interface functions should be called after this one.
107 *****************************************************************************/
108 void __msg_Destroy( vlc_object_t *p_this )
110 if( p_this->p_libvlc->msg_bank.i_sub )
112 msg_Err( p_this, "stale interface subscribers" );
115 /* Flush the queue */
116 if( !p_this->p_libvlc->msg_bank.b_configured )
122 FlushMsg( &p_this->p_libvlc->msg_bank );
126 vlc_mutex_destroy( &p_this->p_libvlc->msg_bank.lock );
129 /*****************************************************************************
130 * msg_Subscribe: subscribe to the message queue.
131 *****************************************************************************/
132 msg_subscription_t *__msg_Subscribe( vlc_object_t *p_this )
134 msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
135 msg_subscription_t *p_sub = malloc( sizeof( msg_subscription_t ) );
137 vlc_mutex_lock( &p_bank->lock );
139 /* Add subscription to the list */
141 p_bank->pp_sub = realloc( p_bank->pp_sub,
142 p_bank->i_sub * sizeof( msg_subscription_t* ) );
144 p_bank->pp_sub[ p_bank->i_sub - 1 ] = p_sub;
146 p_sub->i_start = p_bank->i_start;
147 p_sub->pi_stop = &p_bank->i_stop;
149 p_sub->p_msg = p_bank->msg;
150 p_sub->p_lock = &p_bank->lock;
152 vlc_mutex_unlock( &p_bank->lock );
157 /*****************************************************************************
158 * msg_Unsubscribe: unsubscribe from the message queue.
159 *****************************************************************************/
160 void __msg_Unsubscribe( vlc_object_t *p_this, msg_subscription_t *p_sub )
162 msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
165 vlc_mutex_lock( &p_bank->lock );
170 msg_Err( p_this, "no subscriber in the list" );
174 /* Look for the appropriate subscription */
175 for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
177 if( p_bank->pp_sub[ i_index ] == p_sub )
183 if( p_bank->pp_sub[ i_index ] != p_sub )
185 msg_Err( p_this, "subscriber not found" );
186 vlc_mutex_unlock( &p_bank->lock );
190 /* Remove this subscription */
191 for( ; i_index < (p_bank->i_sub - 1); i_index++ )
193 p_bank->pp_sub[ i_index ] = p_bank->pp_sub[ i_index+1 ];
199 p_bank->pp_sub = realloc( p_bank->pp_sub, p_bank->i_sub
200 * sizeof( msg_subscription_t* ) );
204 free( p_bank->pp_sub );
205 p_bank->pp_sub = NULL;
209 vlc_mutex_unlock( &p_bank->lock );
212 /*****************************************************************************
213 * __msg_*: print a message
214 *****************************************************************************
215 * These functions queue a message for later printing.
216 *****************************************************************************/
217 void __msg_Generic( vlc_object_t *p_this, int i_type, const char *psz_module,
218 const char *psz_format, ... )
222 va_start( args, psz_format );
223 QueueMsg( p_this, i_type, psz_module, psz_format, args );
227 /* Generic functions used when variadic macros are not available. */
228 #define DECLARE_MSG_FN( FN_NAME, FN_TYPE ) \
229 void FN_NAME( void *p_this, const char *psz_format, ... ) \
232 va_start( args, psz_format ); \
233 QueueMsg( (vlc_object_t *)p_this, FN_TYPE, "unknown", \
234 psz_format, args ); \
239 DECLARE_MSG_FN( __msg_Info, VLC_MSG_INFO );
240 DECLARE_MSG_FN( __msg_Err, VLC_MSG_ERR );
241 DECLARE_MSG_FN( __msg_Warn, VLC_MSG_WARN );
242 DECLARE_MSG_FN( __msg_Dbg, VLC_MSG_DBG );
244 /*****************************************************************************
245 * QueueMsg: add a message to a queue
246 *****************************************************************************
247 * This function provides basic functionnalities to other msg_* functions.
248 * It adds a message to a queue (after having printed all stored messages if it
249 * is full). If the message can't be converted to string in memory, it issues
251 *****************************************************************************/
252 static void QueueMsg( vlc_object_t *p_this, int i_type, const char *psz_module,
253 const char *psz_format, va_list args )
255 msg_bank_t * p_bank = &p_this->p_libvlc->msg_bank; /* message bank */
256 char * psz_str = NULL; /* formatted message string */
257 msg_item_t * p_item = NULL; /* pointer to message */
258 msg_item_t item; /* message in case of a full queue */
262 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN)
263 int i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
267 * Convert message to string
269 #if defined(HAVE_VASPRINTF) && !defined(SYS_DARWIN)
270 vasprintf( &psz_str, psz_format, args );
272 psz_str = (char*) malloc( i_size * sizeof(char) );
275 if( psz_str == NULL )
277 fprintf( stderr, "main warning: can't store message (%s): ",
279 vfprintf( stderr, psz_format, args );
280 fprintf( stderr, "\n" );
284 #if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN)
286 psz_temp = ConvertPrintfFormatString( psz_format );
289 fprintf( stderr, "main warning: couldn't print message\n" );
292 vsnprintf( psz_str, i_size, psz_temp, args );
295 vsnprintf( psz_str, i_size, psz_format, args );
297 psz_str[ i_size - 1 ] = 0; /* Just in case */
300 /* Put message in queue */
301 vlc_mutex_lock( &p_bank->lock );
303 /* Check there is room in the queue for our message */
304 if( p_bank->b_overflow )
308 if( ((p_bank->i_stop - p_bank->i_start + 1) % VLC_MSG_QSIZE) == 0 )
310 /* Still in overflow mode, print from a dummy item */
315 /* Pheeew, at last, there is room in the queue! */
316 p_bank->b_overflow = VLC_FALSE;
319 else if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
323 if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
325 p_bank->b_overflow = VLC_TRUE;
327 /* Put the overflow message in the queue */
328 p_item = p_bank->msg + p_bank->i_stop;
329 p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
331 p_item->i_type = VLC_MSG_ERR;
332 p_item->i_object_id = p_this->i_object_id;
333 p_item->i_object_type = p_this->i_object_type;
334 p_item->psz_module = strdup( "message" );
335 p_item->psz_msg = strdup( "message queue overflowed" );
337 PrintMsg( p_this, p_item );
339 /* We print from a dummy item */
344 if( !p_bank->b_overflow )
346 /* Put the message in the queue */
347 p_item = p_bank->msg + p_bank->i_stop;
348 p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
351 /* Fill message information fields */
352 p_item->i_type = i_type;
353 p_item->i_object_id = p_this->i_object_id;
354 p_item->i_object_type = p_this->i_object_type;
355 p_item->psz_module = strdup( psz_module );
356 p_item->psz_msg = psz_str;
358 PrintMsg( p_this, p_item );
360 if( p_bank->b_overflow )
362 free( p_item->psz_module );
363 free( p_item->psz_msg );
366 vlc_mutex_unlock( &p_bank->lock );
369 /* following functions are local */
371 /*****************************************************************************
373 *****************************************************************************
374 * Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
375 * this function does not check the lock.
376 *****************************************************************************/
377 static void FlushMsg ( msg_bank_t *p_bank )
379 int i_index, i_start, i_stop;
381 /* Only flush the queue if it has been properly configured */
382 if( !p_bank->b_configured )
387 /* Get the maximum message index that can be freed */
388 i_stop = p_bank->i_stop;
390 /* Check until which value we can free messages */
391 for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
393 i_start = p_bank->pp_sub[ i_index ]->i_start;
395 /* If this subscriber is late, we don't free messages before
396 * his i_start value, otherwise he'll miss messages */
397 if( ( i_start < i_stop
398 && (p_bank->i_stop <= i_start || i_stop <= p_bank->i_stop) )
399 || ( i_stop < i_start
400 && (i_stop <= p_bank->i_stop && p_bank->i_stop <= i_start) ) )
406 /* Free message data */
407 for( i_index = p_bank->i_start;
409 i_index = (i_index+1) % VLC_MSG_QSIZE )
411 free( p_bank->msg[i_index].psz_msg );
412 free( p_bank->msg[i_index].psz_module );
415 /* Update the new start value */
416 p_bank->i_start = i_index;
419 /*****************************************************************************
420 * PrintMsg: output a message item to stderr
421 *****************************************************************************
422 * Print a message to stderr, with colour formatting if needed.
423 *****************************************************************************/
424 static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
426 # define COL(x) "\033[" #x ";1m"
428 # define GREEN COL(32)
429 # define YELLOW COL(33)
430 # define WHITE COL(37)
431 # define GRAY "\033[0m"
433 static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
434 static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
435 char *psz_object = "private";
436 int i_type = p_item->i_type;
441 if( p_this->p_libvlc->i_verbose < 0 ) return;
444 if( p_this->p_libvlc->i_verbose < 0 ) return;
447 if( p_this->p_libvlc->i_verbose < 1 ) return;
450 if( p_this->p_libvlc->i_verbose < 2 ) return;
454 switch( p_item->i_object_type )
456 case VLC_OBJECT_ROOT: psz_object = "root"; break;
457 case VLC_OBJECT_VLC: psz_object = "vlc"; break;
458 case VLC_OBJECT_MODULE: psz_object = "module"; break;
459 case VLC_OBJECT_INTF: psz_object = "interface"; break;
460 case VLC_OBJECT_PLAYLIST: psz_object = "playlist"; break;
461 case VLC_OBJECT_ITEM: psz_object = "item"; break;
462 case VLC_OBJECT_INPUT: psz_object = "input"; break;
463 case VLC_OBJECT_DECODER: psz_object = "decoder"; break;
464 case VLC_OBJECT_VOUT: psz_object = "video output"; break;
465 case VLC_OBJECT_AOUT: psz_object = "audio output"; break;
466 case VLC_OBJECT_SOUT: psz_object = "stream output"; break;
469 /* Send the message to stderr */
470 if( p_this->p_libvlc->b_color )
472 fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
473 p_item->i_object_id, p_item->psz_module, psz_object,
474 ppsz_type[i_type], ppsz_color[i_type],
479 fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
480 p_item->psz_module, psz_object, ppsz_type[i_type],
487 /*****************************************************************************
488 * ConvertPrintfFormatString: replace all occurrences of %ll with %I64 in the
489 * printf format string.
490 *****************************************************************************
491 * Win32 doesn't recognize the "%ll" format in a printf string, so we have
492 * to convert this string to something that win32 can handle.
493 * This is a REALLY UGLY HACK which won't even work in every situation,
494 * but hey I don't want to put an ifdef WIN32 each time I use printf with
495 * a "long long" type!!!
496 * By the way, if we don't do this we can sometimes end up with segfaults.
497 *****************************************************************************/
499 static char *ConvertPrintfFormatString( const char *psz_format )
501 int i, i_counter=0, i_pos=0;
504 /* We first need to check how many occurences of %ll there are in the
505 * psz_format string. Once we'll know that we'll be able to malloc the
506 * destination string */
508 if( strlen( psz_format ) <= 3 )
509 return strdup( psz_format );
511 for( i=0; i <= (strlen(psz_format) - 3); i++ )
513 if( !strncmp( (char *)(psz_format + i), "%ll", 3 ) )
519 /* malloc the destination string */
520 psz_dest = malloc( strlen(psz_format) + i_counter + 1 );
521 if( psz_dest == NULL )
523 fprintf( stderr, "main warning: ConvertPrintfFormatString failed\n" );
527 /* Now build the modified string */
529 for( i=0; i <= (strlen(psz_format) - 3); i++ )
531 if( !strncmp( (char *)(psz_format + i), "%ll", 3 ) )
533 memcpy( psz_dest+i_pos+i_counter, psz_format+i_pos, i-i_pos+1);
534 *(psz_dest+i+i_counter+1)='I';
535 *(psz_dest+i+i_counter+2)='6';
536 *(psz_dest+i+i_counter+3)='4';
541 strcpy( psz_dest+i_pos+i_counter, psz_format+i_pos );