src/misc/messages.c

   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 vlc_config.h for output configuration.
   5  *****************************************************************************
   6  * Copyright (C) 1998-2005 the VideoLAN team
   7  * $Id$
   8  *
   9  * Authors: Vincent Seguin <seguin@via.ecp.fr>
  10  *          Samuel Hocevar <sam@zoy.org>
  11  *
  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.
  16  *
  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.
  21  *
  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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  25  *****************************************************************************/
  26
  27 /*****************************************************************************
  28  * Preamble
  29  *****************************************************************************/
  30
  31 #include <vlc/vlc.h>
  32
  33 #include <stdarg.h>                                       /* va_list for BSD */
  34
  35 #ifdef HAVE_FCNTL_H
  36 #   include <fcntl.h>                  /* O_CREAT, O_TRUNC, O_WRONLY, O_SYNC */
  37 #endif
  38
  39 #include <errno.h>                                                  /* errno */
  40
  41 #ifdef HAVE_UNISTD_H
  42 #   include <unistd.h>                                   /* close(), write() */
  43 #endif
  44
  45 #include <assert.h>
  46
  47 #include <vlc_charset.h>
  48
  49 /*****************************************************************************
  50  * Local macros
  51  *****************************************************************************/
  52 #if defined(HAVE_VA_COPY)
  53 #   define vlc_va_copy(dest,src) va_copy(dest,src)
  54 #elif defined(HAVE___VA_COPY)
  55 #   define vlc_va_copy(dest,src) __va_copy(dest,src)
  56 #else
  57 #   define vlc_va_copy(dest,src) (dest)=(src)
  58 #endif
  59
  60 #define QUEUE(i) p_this->p_libvlc->msg_bank.queues[i]
  61 #define LOCK_BANK vlc_mutex_lock( &p_this->p_libvlc->msg_bank.lock );
  62 #define UNLOCK_BANK vlc_mutex_unlock( &p_this->p_libvlc->msg_bank.lock );
  63
  64 /*****************************************************************************
  65  * Local prototypes
  66  *****************************************************************************/
  67 static void QueueMsg ( vlc_object_t *, int, int , const char *,
  68                        const char *, va_list );
  69 static void FlushMsg ( msg_queue_t * );
  70 static void PrintMsg ( vlc_object_t *, msg_item_t * );
  71
  72 /**
  73  * Initialize messages queues
  74  * This function initializes all message queues
  75  */
  76 void __msg_Create( vlc_object_t *p_this )
  77 {
  78     int i;
  79     vlc_mutex_init( p_this, &(p_this->p_libvlc->msg_bank.lock) );
  80
  81     for( i = 0; i < 2; i++ )
  82     {
  83          vlc_mutex_init( p_this, &QUEUE(i).lock );
  84          QUEUE(i).b_overflow = VLC_FALSE;
  85          QUEUE(i).i_id = i;
  86          QUEUE(i).i_start = 0;
  87          QUEUE(i).i_stop = 0;
  88          QUEUE(i).i_sub = 0;
  89          QUEUE(i).pp_sub = 0;
  90     }
  91
  92 #ifdef UNDER_CE
  93     QUEUE(MSG_QUEUE_NORMAL).logfile =
  94         CreateFile( L"vlc-log.txt", GENERIC_WRITE,
  95                     FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
  96                     CREATE_ALWAYS, 0, NULL );
  97     SetFilePointer( QUEUE(MSG_QUEUE_NORMAL).logfile, 0, NULL, FILE_END );
  98 #endif
  99 }
 100
 101 /**
 102  * Flush all message queues
 103  */
 104 void __msg_Flush( vlc_object_t *p_this )
 105 {
 106     int i;
 107     for( i = 0 ; i < NB_QUEUES ; i++ )
 108     {
 109         vlc_mutex_lock( &QUEUE(i).lock );
 110         FlushMsg( &QUEUE(i) );
 111         vlc_mutex_unlock( &QUEUE(i).lock );
 112     }
 113 }
 114
 115 /**
 116  * Destroy the message queues
 117  *
 118  * This functions prints all messages remaining in the queues,
 119  * then frees all the allocated ressources
 120  * No other messages interface functions should be called after this one.
 121  */
 122 void __msg_Destroy( vlc_object_t *p_this )
 123 {
 124     int i;
 125     for( i = NB_QUEUES -1 ; i >= 0;  i-- )
 126     {
 127         if( QUEUE(i).i_sub )
 128             msg_Err( p_this, "stale interface subscribers" );
 129
 130         FlushMsg( &QUEUE(i) );
 131
 132 #ifdef UNDER_CE
 133         if( i == MSG_QUEUE_NORMAL )
 134             CloseHandle( QUEUE(MSG_QUEUE_NORMAL).logfile );
 135 #endif
 136         /* Destroy lock */
 137         vlc_mutex_destroy( &QUEUE(i).lock );
 138     }
 139     vlc_mutex_destroy( &(p_this->p_libvlc->msg_bank.lock) );
 140 }
 141
 142 /**
 143  * Subscribe to a message queue.
 144  */
 145 msg_subscription_t *__msg_Subscribe( vlc_object_t *p_this, int i )
 146 {
 147     msg_subscription_t *p_sub = malloc( sizeof( msg_subscription_t ) );
 148
 149     assert( i < NB_QUEUES );
 150
 151     LOCK_BANK;
 152     vlc_mutex_lock( &QUEUE(i).lock );
 153
 154     TAB_APPEND( QUEUE(i).i_sub, QUEUE(i).pp_sub, p_sub );
 155
 156     p_sub->i_start = QUEUE(i).i_start;
 157     p_sub->pi_stop = &QUEUE(i).i_stop;
 158     p_sub->p_msg   = QUEUE(i).msg;
 159     p_sub->p_lock  = &QUEUE(i).lock;
 160
 161     vlc_mutex_unlock( &QUEUE(i).lock );
 162     UNLOCK_BANK;
 163
 164     return p_sub;
 165 }
 166
 167 /**
 168  * Unsubscribe from a message queue.
 169  */
 170 void __msg_Unsubscribe( vlc_object_t *p_this, msg_subscription_t *p_sub )
 171 {
 172     int i,j;
 173
 174     LOCK_BANK;
 175     for( i = 0 ; i< NB_QUEUES ; i++ )
 176     {
 177         vlc_mutex_lock( &QUEUE(i).lock );
 178         for( j = 0 ; j< QUEUE(i).i_sub ; j++ )
 179         {
 180             if( QUEUE(i).pp_sub[j] == p_sub )
 181             {
 182                 REMOVE_ELEM( QUEUE(i).pp_sub, QUEUE(i).i_sub, j );
 183                 if( p_sub ) free( p_sub );
 184             }
 185         }
 186         vlc_mutex_unlock( & QUEUE(i).lock );
 187     }
 188     UNLOCK_BANK;
 189 }
 190
 191 const char *msg_GetObjectTypeName(int i_object_type )
 192 {
 193     switch( i_object_type )
 194     {
 195         case VLC_OBJECT_GLOBAL: return "global";
 196         case VLC_OBJECT_LIBVLC: return "libvlc";
 197         case VLC_OBJECT_MODULE: return "module";
 198         case VLC_OBJECT_INTF: return "interface";
 199         case VLC_OBJECT_PLAYLIST: return "playlist";
 200         case VLC_OBJECT_ITEM: return "item";
 201         case VLC_OBJECT_INPUT: return "input";
 202         case VLC_OBJECT_DECODER: return "decoder";
 203         case VLC_OBJECT_PACKETIZER: return "packetizer";
 204         case VLC_OBJECT_ENCODER: return "encoder";
 205         case VLC_OBJECT_VOUT: return "video output";
 206         case VLC_OBJECT_AOUT: return "audio output";
 207         case VLC_OBJECT_SOUT: return "stream output";
 208         case VLC_OBJECT_HTTPD: return "http server";
 209         case VLC_OBJECT_HTTPD_HOST: return "http server";
 210         case VLC_OBJECT_DIALOGS: return "dialogs provider";
 211         case VLC_OBJECT_VLM: return "vlm";
 212         case VLC_OBJECT_ANNOUNCE: return "announce handler";
 213         case VLC_OBJECT_DEMUX: return "demuxer";
 214         case VLC_OBJECT_ACCESS: return "access";
 215         case VLC_OBJECT_META_ENGINE: return "meta engine";
 216         default: return "private";
 217     }
 218 }
 219
 220 /*****************************************************************************
 221  * __msg_*: print a message
 222  *****************************************************************************
 223  * These functions queue a message for later printing.
 224  *****************************************************************************/
 225 void __msg_Generic( vlc_object_t *p_this, int i_queue, int i_type,
 226                     const char *psz_module,
 227                     const char *psz_format, ... )
 228 {
 229     va_list args;
 230
 231     va_start( args, psz_format );
 232     QueueMsg( p_this, i_queue, i_type, psz_module, psz_format, args );
 233     va_end( args );
 234 }
 235
 236 void __msg_GenericVa( vlc_object_t *p_this, int i_queue,
 237                       int i_type, const char *psz_module,
 238                       const char *psz_format, va_list args )
 239 {
 240     QueueMsg( p_this, i_queue, i_type, psz_module, psz_format, args );
 241 }
 242
 243 /* Generic functions used when variadic macros are not available. */
 244 #define DECLARE_MSG_FN( FN_NAME, FN_TYPE ) \
 245     void FN_NAME( vlc_object_t *p_this, const char *psz_format, ... ) \
 246     { \
 247         va_list args; \
 248         va_start( args, psz_format ); \
 249         QueueMsg( (vlc_object_t *)p_this,MSG_QUEUE_NORMAL, FN_TYPE, "unknown", \
 250                   psz_format, args ); \
 251         va_end( args ); \
 252     } \
 253     struct _
 254 /**
 255  * Output an informational message.
 256  * \note Do not use this for debug messages
 257  * \see input_AddInfo
 258  */
 259 DECLARE_MSG_FN( __msg_Info, VLC_MSG_INFO );
 260 /**
 261  * Output an error message.
 262  */
 263 DECLARE_MSG_FN( __msg_Err,  VLC_MSG_ERR );
 264 /**
 265  * Output a waring message
 266  */
 267 DECLARE_MSG_FN( __msg_Warn, VLC_MSG_WARN );
 268 /**
 269  * Output a debug message
 270  */
 271 DECLARE_MSG_FN( __msg_Dbg,  VLC_MSG_DBG );
 272
 273 /**
 274  * Add a message to a queue
 275  *
 276  * This function provides basic functionnalities to other msg_* functions.
 277  * It adds a message to a queue (after having printed all stored messages if it
 278  * is full). If the message can't be converted to string in memory, it issues
 279  * a warning.
 280  */
 281 static void QueueMsg( vlc_object_t *p_this, int i_queue, int i_type,
 282                       const char *psz_module,
 283                       const char *psz_format, va_list _args )
 284 {
 285     int         i_header_size;             /* Size of the additionnal header */
 286     vlc_object_t *p_obj;
 287     char *       psz_str = NULL;                 /* formatted message string */
 288     char *       psz_header = NULL;
 289     va_list      args;
 290     msg_item_t * p_item = NULL;                        /* pointer to message */
 291     msg_item_t   item;                    /* message in case of a full queue */
 292     msg_queue_t *p_queue;
 293
 294 #if !defined(HAVE_VASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
 295     int          i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
 296 #endif
 297
 298     if( p_this == NULL || p_this->i_flags & OBJECT_FLAGS_QUIET ||
 299         (p_this->i_flags & OBJECT_FLAGS_NODBG && i_type == VLC_MSG_DBG) )
 300     {
 301         return;
 302     }
 303
 304 #ifndef __GLIBC__
 305     /* Expand %m to strerror(errno) - only once */
 306     char buf[strlen( psz_format ) + 2001], *ptr;
 307     strcpy( buf, psz_format );
 308     ptr = psz_format = buf;
 309
 310     for( ;; )
 311     {
 312         ptr = strchr( ptr, '%' );
 313         if( ptr == NULL )
 314             break;
 315
 316         if( ptr[1] == 'm' )
 317         {
 318             char errbuf[2001];
 319             size_t errlen;
 320
 321 #ifndef WIN32
 322             strerror_r( errno, errbuf, 1001 );
 323 #else
 324             int sockerr = WSAGetLastError( );
 325             if( sockerr )
 326             {
 327                 strncpy( errbuf, net_strerror( sockerr ), 1001 );
 328                 WSASetLastError( sockerr );
 329             }
 330             if ((sockerr == 0)
 331              || (strcmp ("Unknown network stack error", errbuf) == 0))
 332                 strncpy( errbuf, strerror( errno ), 1001 );
 333 #endif
 334             errbuf[1000] = 0;
 335
 336             /* Escape '%' from the error string */
 337             for( char *percent = strchr( errbuf, '%' );
 338                  percent != NULL;
 339                  percent = strchr( percent + 2, '%' ) )
 340             {
 341                 memmove( percent + 1, percent, strlen( percent ) + 1 );
 342             }
 343
 344             errlen = strlen( errbuf );
 345             memmove( ptr + errlen, ptr + 2, strlen( ptr + 2 ) + 1 );
 346             memcpy( ptr, errbuf, errlen );
 347             break; /* Only once, so we don't overflow */
 348         }
 349
 350         /* Looks for conversion specifier... */
 351         do
 352             ptr++;
 353         while( *ptr && ( strchr( "diouxXeEfFgGaAcspn%", *ptr ) == NULL ) );
 354         if( *ptr )
 355             ptr++; /* ...and skip it */
 356     }
 357 #endif
 358
 359     /* Convert message to string  */
 360 #if defined(HAVE_VASPRINTF) && !defined(__APPLE__) && !defined( SYS_BEOS )
 361     vlc_va_copy( args, _args );
 362     if( vasprintf( &psz_str, psz_format, args ) == -1 )
 363         psz_str = NULL;
 364     va_end( args );
 365 #else
 366     psz_str = (char*) malloc( i_size );
 367 #endif
 368
 369     if( psz_str == NULL )
 370     {
 371 #ifdef __GLIBC__
 372         fprintf( stderr, "main warning: can't store message (%m): " );
 373 #else
 374         char psz_err[1001];
 375 #ifndef WIN32
 376         /* we're not using GLIBC, so we are sure that the error description
 377          * will be stored in the buffer we provide to strerror_r() */
 378         strerror_r( errno, psz_err, 1001 );
 379 #else
 380         strncpy( psz_err, strerror( errno ), 1001 );
 381 #endif
 382         psz_err[1000] = '\0';
 383         fprintf( stderr, "main warning: can't store message (%s): ", psz_err );
 384 #endif
 385         vlc_va_copy( args, _args );
 386         /* We should use utf8_vfprintf - but it calls malloc()... */
 387         vfprintf( stderr, psz_format, args );
 388         va_end( args );
 389         fputs( "\n", stderr );
 390         return;
 391     }
 392
 393     i_header_size = 0;
 394     p_obj = p_this;
 395     while( p_obj != NULL )
 396     {
 397         char *psz_old = NULL;
 398         if( p_obj->psz_header )
 399         {
 400             i_header_size += strlen( p_obj->psz_header ) + 4;
 401             if( psz_header )
 402             {
 403                 psz_old = strdup( psz_header );
 404                 psz_header = (char*)realloc( psz_header, i_header_size );
 405                 snprintf( psz_header, i_header_size , "[%s] %s",
 406                           p_obj->psz_header, psz_old );
 407             }
 408             else
 409             {
 410                 psz_header = (char *)malloc( i_header_size );
 411                 snprintf( psz_header, i_header_size, "[%s]",
 412                           p_obj->psz_header );
 413             }
 414         }
 415         if( psz_old ) free( psz_old );
 416         p_obj = p_obj->p_parent;
 417     }
 418
 419 #if !defined(HAVE_VASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
 420     vlc_va_copy( args, _args );
 421     vsnprintf( psz_str, i_size, psz_format, args );
 422     va_end( args );
 423     psz_str[ i_size - 1 ] = 0; /* Just in case */
 424 #endif
 425
 426     assert( i_queue < NB_QUEUES );
 427     LOCK_BANK;
 428     p_queue = &QUEUE(i_queue) ;
 429     vlc_mutex_lock( &p_queue->lock );
 430
 431     /* Check there is room in the queue for our message */
 432     if( p_queue->b_overflow )
 433     {
 434         FlushMsg( p_queue );
 435
 436         if( ((p_queue->i_stop - p_queue->i_start + 1) % VLC_MSG_QSIZE) == 0 )
 437         {
 438             /* Still in overflow mode, print from a dummy item */
 439             p_item = &item;
 440         }
 441         else
 442         {
 443             /* Pheeew, at last, there is room in the queue! */
 444             p_queue->b_overflow = VLC_FALSE;
 445         }
 446     }
 447     else if( ((p_queue->i_stop - p_queue->i_start + 2) % VLC_MSG_QSIZE) == 0 )
 448     {
 449         FlushMsg( p_queue );
 450
 451         if( ((p_queue->i_stop - p_queue->i_start + 2) % VLC_MSG_QSIZE) == 0 )
 452         {
 453             p_queue->b_overflow = VLC_TRUE;
 454
 455             if( p_queue->i_id == MSG_QUEUE_NORMAL )
 456             {
 457                /* Put the overflow message in the queue */
 458                 p_item = p_queue->msg + p_queue->i_stop;
 459                 p_queue->i_stop = (p_queue->i_stop + 1) % VLC_MSG_QSIZE;
 460
 461                 p_item->i_type =        VLC_MSG_WARN;
 462                 p_item->i_object_id =   p_this->i_object_id;
 463                 p_item->i_object_type = p_this->i_object_type;
 464                 p_item->psz_module =    strdup( "message" );
 465                 p_item->psz_msg =       strdup( "message queue overflowed" );
 466                 p_item->psz_header =    NULL;
 467
 468                PrintMsg( p_this, p_item );
 469                /* We print from a dummy item */
 470                p_item = &item;
 471             }
 472         }
 473     }
 474
 475     if( !p_queue->b_overflow )
 476     {
 477         /* Put the message in the queue */
 478         p_item = p_queue->msg + p_queue->i_stop;
 479         p_queue->i_stop = (p_queue->i_stop + 1) % VLC_MSG_QSIZE;
 480     }
 481
 482     /* Fill message information fields */
 483     p_item->i_type =        i_type;
 484     p_item->i_object_id =   p_this->i_object_id;
 485     p_item->i_object_type = p_this->i_object_type;
 486     p_item->psz_module =    strdup( psz_module );
 487     p_item->psz_msg =       psz_str;
 488     p_item->psz_header =    psz_header;
 489
 490     if( p_queue->i_id == MSG_QUEUE_NORMAL )
 491         PrintMsg( p_this, p_item );
 492
 493     if( p_queue->b_overflow )
 494     {
 495         if( p_item->psz_module )
 496             free( p_item->psz_module );
 497         if( p_item->psz_msg )
 498             free( p_item->psz_msg );
 499         if( p_item->psz_header )
 500             free( p_item->psz_header );
 501     }
 502
 503     vlc_mutex_unlock ( &p_queue->lock );
 504     UNLOCK_BANK;
 505 }
 506
 507 /* following functions are local */
 508
 509 /*****************************************************************************
 510  * FlushMsg
 511  *****************************************************************************
 512  * Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
 513  * this function does not check the lock.
 514  *****************************************************************************/
 515 static void FlushMsg ( msg_queue_t *p_queue )
 516 {
 517     int i_index, i_start, i_stop;
 518
 519     /* Get the maximum message index that can be freed */
 520     i_stop = p_queue->i_stop;
 521
 522     /* Check until which value we can free messages */
 523     for( i_index = 0; i_index < p_queue->i_sub; i_index++ )
 524     {
 525         i_start = p_queue->pp_sub[ i_index ]->i_start;
 526
 527         /* If this subscriber is late, we don't free messages before
 528          * his i_start value, otherwise he'll miss messages */
 529         if(   ( i_start < i_stop
 530                && (p_queue->i_stop <= i_start || i_stop <= p_queue->i_stop) )
 531            || ( i_stop < i_start
 532                && (i_stop <= p_queue->i_stop && p_queue->i_stop <= i_start) ) )
 533         {
 534             i_stop = i_start;
 535         }
 536     }
 537
 538     /* Free message data */
 539     for( i_index = p_queue->i_start;
 540          i_index != i_stop;
 541          i_index = (i_index+1) % VLC_MSG_QSIZE )
 542     {
 543         if( p_queue->msg[i_index].psz_msg )
 544             free( p_queue->msg[i_index].psz_msg );
 545         if( p_queue->msg[i_index].psz_module )
 546             free( p_queue->msg[i_index].psz_module );
 547         if( p_queue->msg[i_index].psz_header )
 548             free( p_queue->msg[i_index].psz_header );
 549     }
 550
 551     /* Update the new start value */
 552     p_queue->i_start = i_index;
 553 }
 554
 555 /*****************************************************************************
 556  * PrintMsg: output a standard message item to stderr
 557  *****************************************************************************
 558  * Print a message to stderr, with colour formatting if needed.
 559  *****************************************************************************/
 560 static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
 561 {
 562 #   define COL(x)  "\033[" #x ";1m"
 563 #   define RED     COL(31)
 564 #   define GREEN   COL(32)
 565 #   define YELLOW  COL(33)
 566 #   define WHITE   COL(0)
 567 #   define GRAY    "\033[0m"
 568
 569 #ifdef UNDER_CE
 570     int i_dummy;
 571 #endif
 572     static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
 573     static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
 574     const char *psz_object;
 575     int i_type = p_item->i_type;
 576
 577     switch( i_type )
 578     {
 579         case VLC_MSG_ERR:
 580             if( p_this->p_libvlc->i_verbose < 0 ) return;
 581             break;
 582         case VLC_MSG_INFO:
 583             if( p_this->p_libvlc->i_verbose < 0 ) return;
 584             break;
 585         case VLC_MSG_WARN:
 586             if( p_this->p_libvlc->i_verbose < 1 ) return;
 587             break;
 588         case VLC_MSG_DBG:
 589             if( p_this->p_libvlc->i_verbose < 2 ) return;
 590             break;
 591     }
 592
 593     psz_object = msg_GetObjectTypeName(p_item->i_object_type);
 594
 595 #ifdef UNDER_CE
 596 #   define CE_WRITE(str) WriteFile( QUEUE(MSG_QUEUE_NORMAL).logfile, \
 597                                     str, strlen(str), &i_dummy, NULL );
 598     CE_WRITE( p_item->psz_module );
 599     CE_WRITE( " " );
 600     CE_WRITE( psz_object );
 601     CE_WRITE( ppsz_type[i_type] );
 602     CE_WRITE( ": " );
 603     CE_WRITE( p_item->psz_msg );
 604     CE_WRITE( "\r\n" );
 605     FlushFileBuffers( QUEUE(MSG_QUEUE_NORMAL).logfile );
 606
 607 #else
 608     /* Send the message to stderr */
 609     if( p_this->p_libvlc->b_color )
 610     {
 611         if( p_item->psz_header )
 612         {
 613             utf8_fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s %s%s: %s%s" GRAY
 614                               "\n",
 615                          p_item->i_object_id, p_item->psz_header,
 616                          p_item->psz_module, psz_object,
 617                          ppsz_type[i_type], ppsz_color[i_type],
 618                          p_item->psz_msg );
 619         }
 620         else
 621         {
 622              utf8_fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
 623                          p_item->i_object_id, p_item->psz_module, psz_object,
 624                          ppsz_type[i_type], ppsz_color[i_type],
 625                          p_item->psz_msg );
 626         }
 627     }
 628     else
 629     {
 630         if( p_item->psz_header )
 631         {
 632             utf8_fprintf( stderr, "[%.8i] %s %s %s%s: %s\n", p_item->i_object_id,
 633                          p_item->psz_header, p_item->psz_module,
 634                          psz_object, ppsz_type[i_type], p_item->psz_msg );
 635         }
 636         else
 637         {
 638             utf8_fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
 639                          p_item->psz_module, psz_object, ppsz_type[i_type],
 640                          p_item->psz_msg );
 641         }
 642     }
 643
 644 #   if defined(WIN32)
 645     fflush( stderr );
 646 #   endif
 647 #endif
 648 }
 649
 650 static msg_context_t* GetContext(void)
 651 {
 652     msg_context_t *p_ctx = vlc_threadvar_get( &msg_context_global_key );
 653     if( p_ctx == NULL )
 654     {
 655         MALLOC_NULL( p_ctx, msg_context_t );
 656         p_ctx->psz_message = NULL;
 657         vlc_threadvar_set( &msg_context_global_key, p_ctx );
 658     }
 659     return p_ctx;
 660 }
 661
 662 void msg_StackSet( int i_code, const char *psz_message, ... )
 663 {
 664     va_list ap;
 665     msg_context_t *p_ctx = GetContext();
 666     assert( p_ctx );
 667
 668     va_start( ap, psz_message );
 669     free( p_ctx->psz_message );
 670
 671     if( vasprintf( &p_ctx->psz_message, psz_message, ap ) == -1 )
 672         p_ctx->psz_message = NULL;
 673     va_end( ap );
 674
 675     p_ctx->i_code = i_code;
 676 }
 677
 678 void msg_StackAdd( const char *psz_message, ... )
 679 {
 680     char *psz_tmp;
 681     va_list ap;
 682     msg_context_t *p_ctx = GetContext();
 683     assert( p_ctx );
 684
 685     va_start( ap, psz_message );
 686     if( vasprintf( &psz_tmp, psz_message, ap ) == -1 )
 687         psz_tmp = NULL;
 688     va_end( ap );
 689
 690     if( !p_ctx->psz_message )
 691         p_ctx->psz_message = psz_tmp;
 692     else
 693     {
 694         char *psz_old = malloc( strlen( p_ctx->psz_message ) + 1 );
 695         memcpy( psz_old, p_ctx->psz_message, strlen( p_ctx->psz_message ) + 1 );
 696         p_ctx->psz_message = realloc( p_ctx->psz_message,
 697                                       strlen( p_ctx->psz_message ) +
 698                                       /* ':', ' ', '0' */
 699                                       strlen( psz_tmp ) + 3 );
 700         sprintf( p_ctx->psz_message, "%s: %s", psz_tmp, psz_old );
 701         free( psz_tmp ); free( psz_old );
 702     }
 703 }
 704
 705 const char* msg_StackMsg( void )
 706 {
 707     msg_context_t *p_ctx = GetContext();
 708     assert( p_ctx );
 709     return p_ctx->psz_message;
 710 }