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VLC Source 0.5.3.dmg
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messages.c
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2003-04-07
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/*****************************************************************************
* messages.c: messages interface
* This library provides an interface to the message queue to be used by other
* modules, especially intf modules. See config.h for output configuration.
*****************************************************************************
* Copyright (C) 1998-2002 VideoLAN
* $Id: messages.c,v 1.29 2003/01/15 13:46:05 massiot Exp $
*
* Authors: Vincent Seguin <seguin@via.ecp.fr>
* Samuel Hocevar <sam@zoy.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <stdio.h> /* required */
#include <stdarg.h> /* va_list for BSD */
#include <stdlib.h> /* malloc() */
#include <string.h> /* strerror() */
#include <vlc/vlc.h>
#ifdef HAVE_FCNTL_H
# include <fcntl.h> /* O_CREAT, O_TRUNC, O_WRONLY, O_SYNC */
#endif
#ifdef HAVE_ERRNO_H
# include <errno.h> /* errno */
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h> /* close(), write() */
#endif
#include "interface.h"
/*****************************************************************************
* Local prototypes
*****************************************************************************/
static void QueueMsg ( vlc_object_t *, int , const char *,
const char *, va_list );
static void FlushMsg ( msg_bank_t * );
static void PrintMsg ( vlc_object_t *, msg_item_t * );
/*****************************************************************************
* msg_Create: initialize messages interface
*****************************************************************************
* This functions has to be called before any call to other msg_* functions.
* It set up the locks and the message queue if it is used.
*****************************************************************************/
void __msg_Create( vlc_object_t *p_this )
{
/* Message queue initialization */
vlc_mutex_init( p_this, &p_this->p_libvlc->msg_bank.lock );
p_this->p_libvlc->msg_bank.b_configured = VLC_FALSE;
p_this->p_libvlc->msg_bank.b_overflow = VLC_FALSE;
p_this->p_libvlc->msg_bank.i_start = 0;
p_this->p_libvlc->msg_bank.i_stop = 0;
p_this->p_libvlc->msg_bank.i_sub = 0;
p_this->p_libvlc->msg_bank.pp_sub = NULL;
#ifdef UNDER_CE
p_this->p_libvlc->msg_bank.logfile =
CreateFile( L"vlc-log.txt", GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE, NULL,
CREATE_ALWAYS, 0, NULL );
SetFilePointer( p_this->p_libvlc->msg_bank.logfile, 0, NULL, FILE_END );
#endif
}
/*****************************************************************************
* msg_Flush: flush the message queue
*****************************************************************************/
void __msg_Flush( vlc_object_t *p_this )
{
int i_index;
vlc_mutex_lock( &p_this->p_libvlc->msg_bank.lock );
p_this->p_libvlc->msg_bank.b_configured = VLC_TRUE;
for( i_index = p_this->p_libvlc->msg_bank.i_start;
i_index != p_this->p_libvlc->msg_bank.i_stop;
i_index = (i_index+1) % VLC_MSG_QSIZE )
{
PrintMsg( p_this, &p_this->p_libvlc->msg_bank.msg[i_index] );
}
FlushMsg( &p_this->p_libvlc->msg_bank );
vlc_mutex_unlock( &p_this->p_libvlc->msg_bank.lock );
}
/*****************************************************************************
* msg_Destroy: free resources allocated by msg_Create
*****************************************************************************
* This functions prints all messages remaining in queue, then free all the
* resources allocated by msg_Create.
* No other messages interface functions should be called after this one.
*****************************************************************************/
void __msg_Destroy( vlc_object_t *p_this )
{
if( p_this->p_libvlc->msg_bank.i_sub )
{
msg_Err( p_this, "stale interface subscribers" );
}
/* Flush the queue */
if( !p_this->p_libvlc->msg_bank.b_configured )
{
msg_Flush( p_this );
}
else
{
FlushMsg( &p_this->p_libvlc->msg_bank );
}
#ifdef UNDER_CE
CloseHandle( p_this->p_libvlc->msg_bank.logfile );
#endif
/* Destroy lock */
vlc_mutex_destroy( &p_this->p_libvlc->msg_bank.lock );
}
/*****************************************************************************
* msg_Subscribe: subscribe to the message queue.
*****************************************************************************/
msg_subscription_t *__msg_Subscribe( vlc_object_t *p_this )
{
msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
msg_subscription_t *p_sub = malloc( sizeof( msg_subscription_t ) );
vlc_mutex_lock( &p_bank->lock );
/* Add subscription to the list */
INSERT_ELEM( p_bank->pp_sub, p_bank->i_sub, p_bank->i_sub, p_sub );
p_sub->i_start = p_bank->i_start;
p_sub->pi_stop = &p_bank->i_stop;
p_sub->p_msg = p_bank->msg;
p_sub->p_lock = &p_bank->lock;
vlc_mutex_unlock( &p_bank->lock );
return p_sub;
}
/*****************************************************************************
* msg_Unsubscribe: unsubscribe from the message queue.
*****************************************************************************/
void __msg_Unsubscribe( vlc_object_t *p_this, msg_subscription_t *p_sub )
{
msg_bank_t *p_bank = &p_this->p_libvlc->msg_bank;
int i_index;
vlc_mutex_lock( &p_bank->lock );
/* Sanity check */
if( !p_bank->i_sub )
{
msg_Err( p_this, "no subscriber in the list" );
return;
}
/* Look for the appropriate subscription */
for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
{
if( p_bank->pp_sub[ i_index ] == p_sub )
{
break;
}
}
if( p_bank->pp_sub[ i_index ] != p_sub )
{
msg_Err( p_this, "subscriber not found" );
vlc_mutex_unlock( &p_bank->lock );
return;
}
/* Remove this subscription */
REMOVE_ELEM( p_bank->pp_sub, p_bank->i_sub, i_index );
vlc_mutex_unlock( &p_bank->lock );
}
/*****************************************************************************
* __msg_*: print a message
*****************************************************************************
* These functions queue a message for later printing.
*****************************************************************************/
void __msg_Generic( vlc_object_t *p_this, int i_type, const char *psz_module,
const char *psz_format, ... )
{
va_list args;
va_start( args, psz_format );
QueueMsg( p_this, i_type, psz_module, psz_format, args );
va_end( args );
}
/* Generic functions used when variadic macros are not available. */
#define DECLARE_MSG_FN( FN_NAME, FN_TYPE ) \
void FN_NAME( void *p_this, const char *psz_format, ... ) \
{ \
va_list args; \
va_start( args, psz_format ); \
QueueMsg( (vlc_object_t *)p_this, FN_TYPE, "unknown", \
psz_format, args ); \
va_end( args ); \
} \
struct _
DECLARE_MSG_FN( __msg_Info, VLC_MSG_INFO );
DECLARE_MSG_FN( __msg_Err, VLC_MSG_ERR );
DECLARE_MSG_FN( __msg_Warn, VLC_MSG_WARN );
DECLARE_MSG_FN( __msg_Dbg, VLC_MSG_DBG );
/*****************************************************************************
* QueueMsg: add a message to a queue
*****************************************************************************
* This function provides basic functionnalities to other msg_* functions.
* It adds a message to a queue (after having printed all stored messages if it
* is full). If the message can't be converted to string in memory, it issues
* a warning.
*****************************************************************************/
static void QueueMsg( vlc_object_t *p_this, int i_type, const char *psz_module,
const char *psz_format, va_list args )
{
msg_bank_t * p_bank = &p_this->p_libvlc->msg_bank; /* message bank */
char * psz_str = NULL; /* formatted message string */
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(SYS_DARWIN)
int i_size = strlen(psz_format) + INTF_MAX_MSG_SIZE;
#endif
/*
* Convert message to string
*/
#if defined(HAVE_VASPRINTF) && !defined(SYS_DARWIN)
vasprintf( &psz_str, psz_format, args );
#else
psz_str = (char*) malloc( i_size * sizeof(char) );
#endif
if( psz_str == NULL )
{
#ifdef HAVE_ERRNO_H
fprintf( stderr, "main warning: can't store message (%s): ",
strerror(errno) );
#else
fprintf( stderr, "main warning: can't store message: " );
#endif
vfprintf( stderr, psz_format, args );
fprintf( stderr, "\n" );
return;
}
#if !defined(HAVE_VASPRINTF) || defined(SYS_DARWIN)
vsnprintf( psz_str, i_size, psz_format, args );
psz_str[ i_size - 1 ] = 0; /* Just in case */
#endif
/* Put message in queue */
vlc_mutex_lock( &p_bank->lock );
/* Check there is room in the queue for our message */
if( p_bank->b_overflow )
{
FlushMsg( p_bank );
if( ((p_bank->i_stop - p_bank->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_bank->b_overflow = VLC_FALSE;
}
}
else if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
{
FlushMsg( p_bank );
if( ((p_bank->i_stop - p_bank->i_start + 2) % VLC_MSG_QSIZE) == 0 )
{
p_bank->b_overflow = VLC_TRUE;
/* Put the overflow message in the queue */
p_item = p_bank->msg + p_bank->i_stop;
p_bank->i_stop = (p_bank->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" );
PrintMsg( p_this, p_item );
/* We print from a dummy item */
p_item = &item;
}
}
if( !p_bank->b_overflow )
{
/* Put the message in the queue */
p_item = p_bank->msg + p_bank->i_stop;
p_bank->i_stop = (p_bank->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;
PrintMsg( p_this, p_item );
if( p_bank->b_overflow )
{
free( p_item->psz_module );
free( p_item->psz_msg );
}
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_bank_t *p_bank )
{
int i_index, i_start, i_stop;
/* Only flush the queue if it has been properly configured */
if( !p_bank->b_configured )
{
return;
}
/* Get the maximum message index that can be freed */
i_stop = p_bank->i_stop;
/* Check until which value we can free messages */
for( i_index = 0; i_index < p_bank->i_sub; i_index++ )
{
i_start = p_bank->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_bank->i_stop <= i_start || i_stop <= p_bank->i_stop) )
|| ( i_stop < i_start
&& (i_stop <= p_bank->i_stop && p_bank->i_stop <= i_start) ) )
{
i_stop = i_start;
}
}
/* Free message data */
for( i_index = p_bank->i_start;
i_index != i_stop;
i_index = (i_index+1) % VLC_MSG_QSIZE )
{
free( p_bank->msg[i_index].psz_msg );
free( p_bank->msg[i_index].psz_module );
}
/* Update the new start value */
p_bank->i_start = i_index;
}
/*****************************************************************************
* PrintMsg: output a 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 )
{
#ifndef WIN32
# 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"
#else
# define RED ""
# define GREEN ""
# define YELLOW ""
# define WHITE ""
# define GRAY ""
#endif
#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;
}
switch( p_item->i_object_type )
{
case VLC_OBJECT_ROOT: psz_object = "root"; break;
case VLC_OBJECT_VLC: psz_object = "vlc"; break;
case VLC_OBJECT_MODULE: psz_object = "module"; break;
case VLC_OBJECT_INTF: psz_object = "interface"; break;
case VLC_OBJECT_PLAYLIST: psz_object = "playlist"; break;
case VLC_OBJECT_ITEM: psz_object = "item"; break;
case VLC_OBJECT_INPUT: psz_object = "input"; break;
case VLC_OBJECT_DECODER: psz_object = "decoder"; break;
case VLC_OBJECT_VOUT: psz_object = "video output"; break;
case VLC_OBJECT_AOUT: psz_object = "audio output"; break;
case VLC_OBJECT_SOUT: psz_object = "stream output"; break;
}
#ifdef UNDER_CE
# define CE_WRITE(str) WriteFile( p_this->p_libvlc->msg_bank.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.logfile );
#else
/* Send the message to stderr */
if( p_this->p_libvlc->b_color )
{
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
{
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
}