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/*****************************************************************************
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* messages.c: messages interface
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* This library provides an interface to the message queue to be used by other
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* modules, especially intf modules. See config.h for output configuration.
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*****************************************************************************
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* Copyright (C) 1998-2004 VideoLAN
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* $Id: messages.c 7553 2004-04-29 15:30:00Z zorglub $
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* Authors: Vincent Seguin <seguin@via.ecp.fr>
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* Samuel Hocevar <sam@zoy.org>
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
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*****************************************************************************/
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/*****************************************************************************
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*****************************************************************************/
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#include <stdio.h> /* required */
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#include <stdarg.h> /* va_list for BSD */
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#include <stdlib.h> /* malloc() */
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#include <string.h> /* strerror() */
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# include <fcntl.h> /* O_CREAT, O_TRUNC, O_WRONLY, O_SYNC */
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# include <errno.h> /* errno */
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# include <unistd.h> /* close(), write() */
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#include "vlc_interface.h"
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/*****************************************************************************
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*****************************************************************************/
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#if defined(HAVE_VA_COPY)
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# define vlc_va_copy(dest,src) va_copy(dest,src)
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#elif defined(HAVE___VA_COPY)
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# define vlc_va_copy(dest,src) __va_copy(dest,src)
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# define vlc_va_copy(dest,src) (dest)=(src)
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/*****************************************************************************
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*****************************************************************************/
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static void QueueMsg ( vlc_object_t *, int , const char *,
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const char *, va_list );
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static void FlushMsg ( msg_bank_t * );
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static void PrintMsg ( vlc_object_t *, msg_item_t * );
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* Initialize messages interface
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* This functions has to be called before any call to other msg_* functions.
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* It set up the locks and the message queue if it is used.
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void __msg_Create( vlc_object_t *p_this )
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/* Message queue initialization */
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vlc_mutex_init( p_this, &p_this->p_libvlc->msg_bank.lock );
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p_this->p_libvlc->msg_bank.b_configured = VLC_FALSE;
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p_this->p_libvlc->msg_bank.b_overflow = VLC_FALSE;
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p_this->p_libvlc->msg_bank.i_start = 0;
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p_this->p_libvlc->msg_bank.i_stop = 0;
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p_this->p_libvlc->msg_bank.i_sub = 0;
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p_this->p_libvlc->msg_bank.pp_sub = NULL;
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p_this->p_libvlc->msg_bank.logfile =
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CreateFile( L"vlc-log.txt", GENERIC_WRITE,
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FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
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CREATE_ALWAYS, 0, NULL );
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SetFilePointer( p_this->p_libvlc->msg_bank.logfile, 0, NULL, FILE_END );
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* Flush the message queue
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void __msg_Flush( vlc_object_t *p_this )
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vlc_mutex_lock( &p_this->p_libvlc->msg_bank.lock );
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p_this->p_libvlc->msg_bank.b_configured = VLC_TRUE;
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for( i_index = p_this->p_libvlc->msg_bank.i_start;
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i_index != p_this->p_libvlc->msg_bank.i_stop;
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i_index = (i_index+1) % VLC_MSG_QSIZE )
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PrintMsg( p_this, &p_this->p_libvlc->msg_bank.msg[i_index] );
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FlushMsg( &p_this->p_libvlc->msg_bank );
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vlc_mutex_unlock( &p_this->p_libvlc->msg_bank.lock );
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* Free resources allocated by msg_Create
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* This functions prints all messages remaining in queue, then free all the
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* resources allocated by msg_Create.
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* No other messages interface functions should be called after this one.
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void __msg_Destroy( vlc_object_t *p_this )
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if( p_this->p_libvlc->msg_bank.i_sub )
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msg_Err( p_this, "stale interface subscribers" );
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/* Flush the queue */
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if( !p_this->p_libvlc->msg_bank.b_configured )
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FlushMsg( &p_this->p_libvlc->msg_bank );
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CloseHandle( p_this->p_libvlc->msg_bank.logfile );
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vlc_mutex_destroy( &p_this->p_libvlc->msg_bank.lock );
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* Subscribe to the message queue.
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msg_subscription_t *__msg_Subscribe( vlc_object_t *p_this )
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msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
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msg_subscription_t *p_sub = malloc( sizeof( msg_subscription_t ) );
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vlc_mutex_lock( &p_bank->lock );
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/* Add subscription to the list */
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INSERT_ELEM( p_bank->pp_sub, p_bank->i_sub, p_bank->i_sub, p_sub );
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p_sub->i_start = p_bank->i_start;
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p_sub->pi_stop = &p_bank->i_stop;
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p_sub->p_msg = p_bank->msg;
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p_sub->p_lock = &p_bank->lock;
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vlc_mutex_unlock( &p_bank->lock );
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* Unsubscribe from the message queue.
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void __msg_Unsubscribe( vlc_object_t *p_this, msg_subscription_t *p_sub )
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msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
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vlc_mutex_lock( &p_bank->lock );
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msg_Err( p_this, "no subscriber in the list" );
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/* Look for the appropriate subscription */
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for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
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if( p_bank->pp_sub[ i_index ] == p_sub )
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if( p_bank->pp_sub[ i_index ] != p_sub )
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msg_Err( p_this, "subscriber not found" );
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vlc_mutex_unlock( &p_bank->lock );
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/* Remove this subscription */
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REMOVE_ELEM( p_bank->pp_sub, p_bank->i_sub, i_index );
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vlc_mutex_unlock( &p_bank->lock );
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/*****************************************************************************
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* __msg_*: print a message
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*****************************************************************************
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* These functions queue a message for later printing.
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*****************************************************************************/
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void __msg_Generic( vlc_object_t *p_this, int i_type, const char *psz_module,
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const char *psz_format, ... )
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va_start( args, psz_format );
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QueueMsg( p_this, i_type, psz_module, psz_format, args );
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void __msg_GenericVa( vlc_object_t *p_this, int i_type, const char *psz_module,
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const char *psz_format, va_list args )
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QueueMsg( p_this, i_type, psz_module, psz_format, args );
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/* Generic functions used when variadic macros are not available. */
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#define DECLARE_MSG_FN( FN_NAME, FN_TYPE ) \
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void FN_NAME( vlc_object_t *p_this, const char *psz_format, ... ) \
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va_start( args, psz_format ); \
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QueueMsg( (vlc_object_t *)p_this, FN_TYPE, "unknown", \
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psz_format, args ); \
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* Output an informational message.
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* \note Do not use this for debug messages
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DECLARE_MSG_FN( __msg_Info, VLC_MSG_INFO );
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* Output an error message.
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DECLARE_MSG_FN( __msg_Err, VLC_MSG_ERR );
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* Output a waring message
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DECLARE_MSG_FN( __msg_Warn, VLC_MSG_WARN );
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* Output a debug message
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DECLARE_MSG_FN( __msg_Dbg, VLC_MSG_DBG );
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* Add a message to a queue
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* This function provides basic functionnalities to other msg_* functions.
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* It adds a message to a queue (after having printed all stored messages if it
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* is full). If the message can't be converted to string in memory, it issues
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static void QueueMsg( vlc_object_t *p_this, int i_type, const char *psz_module,
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const char *psz_format, va_list _args )
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msg_bank_t * p_bank = &p_this->p_libvlc->msg_bank; /* message bank */
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char * psz_str = NULL; /* formatted message string */
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msg_item_t * p_item = NULL; /* pointer to message */
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msg_item_t item; /* message in case of a full queue */
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#if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
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int i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
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* Convert message to string
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#if defined(HAVE_VASPRINTF) && !defined(SYS_DARWIN) && !defined( SYS_BEOS )
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vlc_va_copy( args, _args );
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vasprintf( &psz_str, psz_format, args );
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psz_str = (char*) malloc( i_size * sizeof(char) );
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if( psz_str == NULL )
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fprintf( stderr, "main warning: can't store message (%s): ",
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fprintf( stderr, "main warning: can't store message: " );
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vlc_va_copy( args, _args );
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vfprintf( stderr, psz_format, args );
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fprintf( stderr, "\n" );
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#if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN) || defined(SYS_BEOS)
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vlc_va_copy( args, _args );
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vsnprintf( psz_str, i_size, psz_format, args );
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psz_str[ i_size - 1 ] = 0; /* Just in case */
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/* Put message in queue */
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vlc_mutex_lock( &p_bank->lock );
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/* Check there is room in the queue for our message */
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if( p_bank->b_overflow )
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if( ((p_bank->i_stop - p_bank->i_start + 1) % VLC_MSG_QSIZE) == 0 )
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/* Still in overflow mode, print from a dummy item */
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/* Pheeew, at last, there is room in the queue! */
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p_bank->b_overflow = VLC_FALSE;
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else if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
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if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
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p_bank->b_overflow = VLC_TRUE;
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/* Put the overflow message in the queue */
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p_item = p_bank->msg + p_bank->i_stop;
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p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
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p_item->i_type = VLC_MSG_WARN;
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p_item->i_object_id = p_this->i_object_id;
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p_item->i_object_type = p_this->i_object_type;
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p_item->psz_module = strdup( "message" );
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p_item->psz_msg = strdup( "message queue overflowed" );
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PrintMsg( p_this, p_item );
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/* We print from a dummy item */
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if( !p_bank->b_overflow )
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/* Put the message in the queue */
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p_item = p_bank->msg + p_bank->i_stop;
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p_bank->i_stop = (p_bank->i_stop + 1) % VLC_MSG_QSIZE;
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/* Fill message information fields */
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p_item->i_type = i_type;
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p_item->i_object_id = p_this->i_object_id;
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p_item->i_object_type = p_this->i_object_type;
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p_item->psz_module = strdup( psz_module );
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p_item->psz_msg = psz_str;
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PrintMsg( p_this, p_item );
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if( p_bank->b_overflow )
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free( p_item->psz_module );
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free( p_item->psz_msg );
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vlc_mutex_unlock( &p_bank->lock );
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/* following functions are local */
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/*****************************************************************************
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*****************************************************************************
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* Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
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* this function does not check the lock.
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*****************************************************************************/
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static void FlushMsg ( msg_bank_t *p_bank )
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int i_index, i_start, i_stop;
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/* Only flush the queue if it has been properly configured */
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if( !p_bank->b_configured )
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/* Get the maximum message index that can be freed */
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i_stop = p_bank->i_stop;
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/* Check until which value we can free messages */
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for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
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i_start = p_bank->pp_sub[ i_index ]->i_start;
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/* If this subscriber is late, we don't free messages before
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* his i_start value, otherwise he'll miss messages */
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if( ( i_start < i_stop
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&& (p_bank->i_stop <= i_start || i_stop <= p_bank->i_stop) )
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|| ( i_stop < i_start
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&& (i_stop <= p_bank->i_stop && p_bank->i_stop <= i_start) ) )
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/* Free message data */
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for( i_index = p_bank->i_start;
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i_index = (i_index+1) % VLC_MSG_QSIZE )
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free( p_bank->msg[i_index].psz_msg );
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free( p_bank->msg[i_index].psz_module );
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/* Update the new start value */
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p_bank->i_start = i_index;
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/*****************************************************************************
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* PrintMsg: output a message item to stderr
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*****************************************************************************
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* Print a message to stderr, with colour formatting if needed.
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*****************************************************************************/
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static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
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# define COL(x) "\033[" #x ";1m"
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# define GREEN COL(32)
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# define YELLOW COL(33)
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# define WHITE COL(37)
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# define GRAY "\033[0m"
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static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
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static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
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char *psz_object = "private";
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int i_type = p_item->i_type;
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if( p_this->p_libvlc->i_verbose < 0 ) return;
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if( p_this->p_libvlc->i_verbose < 0 ) return;
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if( p_this->p_libvlc->i_verbose < 1 ) return;
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if( p_this->p_libvlc->i_verbose < 2 ) return;
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switch( p_item->i_object_type )
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case VLC_OBJECT_ROOT: psz_object = "root"; break;
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case VLC_OBJECT_VLC: psz_object = "vlc"; break;
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case VLC_OBJECT_MODULE: psz_object = "module"; break;
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case VLC_OBJECT_INTF: psz_object = "interface"; break;
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case VLC_OBJECT_PLAYLIST: psz_object = "playlist"; break;
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case VLC_OBJECT_ITEM: psz_object = "item"; break;
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case VLC_OBJECT_INPUT: psz_object = "input"; break;
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case VLC_OBJECT_DECODER: psz_object = "decoder"; break;
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case VLC_OBJECT_PACKETIZER: psz_object = "packetizer"; break;
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case VLC_OBJECT_ENCODER: psz_object = "encoder"; break;
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case VLC_OBJECT_VOUT: psz_object = "video output"; break;
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case VLC_OBJECT_AOUT: psz_object = "audio output"; break;
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case VLC_OBJECT_SOUT: psz_object = "stream output"; break;
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case VLC_OBJECT_HTTPD: psz_object = "http daemon"; break;
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case VLC_OBJECT_DIALOGS: psz_object = "dialogs provider"; break;
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case VLC_OBJECT_VLM: psz_object = "vlm"; break;
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case VLC_OBJECT_ANNOUNCE: psz_object = "announce handler"; break;
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case VLC_OBJECT_DEMUX: psz_object = "demuxer"; break;
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# define CE_WRITE(str) WriteFile( p_this->p_libvlc->msg_bank.logfile, \
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str, strlen(str), &i_dummy, NULL );
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CE_WRITE( p_item->psz_module );
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CE_WRITE( psz_object );
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CE_WRITE( ppsz_type[i_type] );
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CE_WRITE( p_item->psz_msg );
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FlushFileBuffers( p_this->p_libvlc->msg_bank.logfile );
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/* Send the message to stderr */
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if( p_this->p_libvlc->b_color )
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fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
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p_item->i_object_id, p_item->psz_module, psz_object,
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ppsz_type[i_type], ppsz_color[i_type],
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fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
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p_item->psz_module, psz_object, ppsz_type[i_type],