messages.c

uclinux 下的vlc播放器源代码

                      const char *psz_module,
                      const char *psz_format, va_list _args )
{
    int         i_header_size;             /* Size of the additionnal header */
    vlc_object_t *p_obj;
    msg_bank_t  *p_bank;                                     /* message bank */
    msg_queue_t *p_queue = NULL;
    char *       psz_str = NULL;                 /* formatted message string */
    char *       psz_header = NULL;
    va_list      args;
    msg_item_t * p_item = NULL;                        /* pointer to message */
    msg_item_t   item;                    /* message in case of a full queue */

#if !defined(HAVE_VASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
    int          i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
#endif
    int i;

    if( p_this == NULL || p_this->i_flags & OBJECT_FLAGS_QUIET ||
        (p_this->i_flags & OBJECT_FLAGS_NODBG && i_type == VLC_MSG_DBG) )
    {
        return;
    }

    p_bank = &p_this->p_libvlc->msg_bank;

    /*
     * Convert message to string
     */
#if defined(HAVE_VASPRINTF) && !defined(__APPLE__) && !defined( SYS_BEOS )
    vlc_va_copy( args, _args );
    vasprintf( &psz_str, psz_format, args );
    va_end( args );
#else
    psz_str = (char*) malloc( i_size * sizeof(char) );
#endif

    if( psz_str == NULL )
    {
        fprintf( stderr, "main warning: can't store message (%s): ",
                 strerror(errno) );
        vlc_va_copy( args, _args );
        /* We should use utf8_vfprintf - but it calls malloc()... */
        vfprintf( stderr, psz_format, args );
        va_end( args );
        fputs( "\n", stderr );
        return;
    }

    i_header_size = 0;
    p_obj = p_this;
    while( p_obj != NULL )
    {
        char *psz_old = NULL;
        if( p_obj == NULL ) break;
        if( p_obj->psz_header )
        {
            i_header_size += strlen( p_obj->psz_header ) + 4;
            if( psz_header )
            {
                psz_old = strdup( psz_header );
                psz_header = (char*)realloc( psz_header, i_header_size );
                snprintf( psz_header, i_header_size , "[%s] %s",
                          p_obj->psz_header, psz_old );
            }
            else
            {
                psz_header = (char *)malloc( i_header_size );
                snprintf( psz_header, i_header_size, "[%s]",
                          p_obj->psz_header );
            }
        }
        if( psz_old ) free( psz_old );
        p_obj = p_obj->p_parent;
    }

#if !defined(HAVE_VASPRINTF) || defined(__APPLE__) || defined(SYS_BEOS)
    vlc_va_copy( args, _args );
    vsnprintf( psz_str, i_size, psz_format, args );
    va_end( args );
    psz_str[ i_size - 1 ] = 0; /* Just in case */
#endif

    /* Put message in queue */
    vlc_mutex_lock( &p_bank->lock );
    for( i = 0 ; i <p_bank->i_queues ;i++ )
    {
        if( p_bank->pp_queues[i]->i_id == i_queue_id )
        {
            p_queue = p_bank->pp_queues[i];
        }
    }

    if( p_queue == NULL )
    {
        vlc_mutex_unlock( &p_bank->lock );
        if( psz_str ) free( psz_str );
        if( psz_header ) free( psz_header );
        return;
    }

    vlc_mutex_lock( &p_queue->lock );

    /* Check there is room in the queue for our message */
    if( p_queue->b_overflow )
    {
        FlushMsg( p_queue );

        if( ((p_queue->i_stop - p_queue->i_start + 1) % VLC_MSG_QSIZE) == 0 )
        {
            /* Still in overflow mode, print from a dummy item */
            p_item = &item;
        }
        else
        {
            /* Pheeew, at last, there is room in the queue! */
            p_queue->b_overflow = VLC_FALSE;
        }
    }
    else if( ((p_queue->i_stop - p_queue->i_start + 2) % VLC_MSG_QSIZE) == 0 )
    {
        FlushMsg( p_queue );

        if( ((p_queue->i_stop - p_queue->i_start + 2) % VLC_MSG_QSIZE) == 0 )
        {
            p_queue->b_overflow = VLC_TRUE;

            if( p_queue->i_id == MSG_QUEUE_NORMAL )
            {
               /* Put the overflow message in the queue */
                p_item = p_queue->msg + p_queue->i_stop;
                p_queue->i_stop = (p_queue->i_stop + 1) % VLC_MSG_QSIZE;

                p_item->i_type =        VLC_MSG_WARN;
                p_item->i_object_id =   p_this->i_object_id;
                p_item->i_object_type = p_this->i_object_type;
                p_item->psz_module =    strdup( "message" );
                p_item->psz_msg =       strdup( "message queue overflowed" );
                p_item->psz_header =    NULL;

               PrintMsg( p_this, p_item );
               /* We print from a dummy item */
               p_item = &item;
            }
        }
    }

    if( !p_queue->b_overflow )
    {
        /* Put the message in the queue */
        p_item = p_queue->msg + p_queue->i_stop;
        p_queue->i_stop = (p_queue->i_stop + 1) % VLC_MSG_QSIZE;
    }

    /* Fill message information fields */
    p_item->i_type =        i_type;
    p_item->i_object_id =   p_this->i_object_id;
    p_item->i_object_type = p_this->i_object_type;
    p_item->psz_module =    strdup( psz_module );
    p_item->psz_msg =       psz_str;
    p_item->psz_header =    psz_header;

    if( p_queue->i_id == MSG_QUEUE_NORMAL )
        PrintMsg( p_this, p_item );

    if( p_queue->b_overflow )
    {
        if( p_item->psz_module )
            free( p_item->psz_module );
        if( p_item->psz_msg )
            free( p_item->psz_msg );
        if( p_item->psz_header )
            free( p_item->psz_header );
    }

    vlc_mutex_unlock ( &p_queue->lock );
    vlc_mutex_unlock( &p_bank->lock );
}

/* following functions are local */

/*****************************************************************************
 * FlushMsg
 *****************************************************************************
 * Print all messages remaining in queue. MESSAGE QUEUE MUST BE LOCKED, since
 * this function does not check the lock.
 *****************************************************************************/
static void FlushMsg ( msg_queue_t *p_queue )
{
    int i_index, i_start, i_stop;

    /* Get the maximum message index that can be freed */
    i_stop = p_queue->i_stop;

    /* Check until which value we can free messages */
    for( i_index = 0; i_index < p_queue->i_sub; i_index++ )
    {
        i_start = p_queue->pp_sub[ i_index ]->i_start;

        /* If this subscriber is late, we don't free messages before
         * his i_start value, otherwise he'll miss messages */
        if(   ( i_start < i_stop
               && (p_queue->i_stop <= i_start || i_stop <= p_queue->i_stop) )
           || ( i_stop < i_start
               && (i_stop <= p_queue->i_stop && p_queue->i_stop <= i_start) ) )
        {
            i_stop = i_start;
        }
    }

    /* Free message data */
    for( i_index = p_queue->i_start;
         i_index != i_stop;
         i_index = (i_index+1) % VLC_MSG_QSIZE )
    {
        if( p_queue->msg[i_index].psz_msg )
            free( p_queue->msg[i_index].psz_msg );
        if( p_queue->msg[i_index].psz_module )
            free( p_queue->msg[i_index].psz_module );
        if( p_queue->msg[i_index].psz_header )
            free( p_queue->msg[i_index].psz_header );
    }

    /* Update the new start value */
    p_queue->i_start = i_index;
}

/*****************************************************************************
 * PrintMsg: output a standard message item to stderr
 *****************************************************************************
 * Print a message to stderr, with colour formatting if needed.
 *****************************************************************************/
static void PrintMsg ( vlc_object_t * p_this, msg_item_t * p_item )
{
#   define COL(x)  "\033[" #x ";1m"
#   define RED     COL(31)
#   define GREEN   COL(32)
#   define YELLOW  COL(33)
#   define WHITE   COL(37)
#   define GRAY    "\033[0m"

#ifdef UNDER_CE
    int i_dummy;
#endif
    static const char * ppsz_type[4] = { "", " error", " warning", " debug" };
    static const char *ppsz_color[4] = { WHITE, RED, YELLOW, GRAY };
    char *psz_object = "private";
    int i_type = p_item->i_type;

    switch( i_type )
    {
        case VLC_MSG_ERR:
            if( p_this->p_libvlc->i_verbose < 0 ) return;
            break;
        case VLC_MSG_INFO:
            if( p_this->p_libvlc->i_verbose < 0 ) return;
            break;
        case VLC_MSG_WARN:
            if( p_this->p_libvlc->i_verbose < 1 ) return;
            break;
        case VLC_MSG_DBG:
            if( p_this->p_libvlc->i_verbose < 2 ) return;
            break;
    }

    psz_object = msg_GetObjectTypeName(p_item->i_object_type);

#ifdef UNDER_CE
#   define CE_WRITE(str) WriteFile( p_this->p_libvlc->msg_bank.pp_queues[MSG_QUEUE_NORMAL]->logfile, \
                                    str, strlen(str), &i_dummy, NULL );
    CE_WRITE( p_item->psz_module );
    CE_WRITE( " " );
    CE_WRITE( psz_object );
    CE_WRITE( ppsz_type[i_type] );
    CE_WRITE( ": " );
    CE_WRITE( p_item->psz_msg );
    CE_WRITE( "\r\n" );
    FlushFileBuffers( p_this->p_libvlc->msg_bank.pp_queues[MSG_QUEUE_NORMAL]->logfile );

#else
    /* Send the message to stderr */
    if( p_this->p_libvlc->b_color )
    {
        if( p_item->psz_header )
        {
            utf8_fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s %s%s: %s%s" GRAY
                              "\n",
                         p_item->i_object_id, p_item->psz_header,
                         p_item->psz_module, psz_object,
                         ppsz_type[i_type], ppsz_color[i_type],
                         p_item->psz_msg );
        }
        else
        {
             utf8_fprintf( stderr, "[" GREEN "%.8i" GRAY "] %s %s%s: %s%s" GRAY "\n",
                         p_item->i_object_id, p_item->psz_module, psz_object,
                         ppsz_type[i_type], ppsz_color[i_type],
                         p_item->psz_msg );
        }
    }
    else
    {
        if( p_item->psz_header )
        {
            utf8_fprintf( stderr, "[%.8i] %s %s %s%s: %s\n", p_item->i_object_id,
                         p_item->psz_header, p_item->psz_module,
                         psz_object, ppsz_type[i_type], p_item->psz_msg );
        }
        else
        {
            utf8_fprintf( stderr, "[%.8i] %s %s%s: %s\n", p_item->i_object_id,
                         p_item->psz_module, psz_object, ppsz_type[i_type],
                         p_item->psz_msg );
        }
    }

#   if defined(WIN32)
    fflush( stderr );
#   endif
#endif
}