root/src/modules/modules.c

/*****************************************************************************
 * modules.c : Builtin and plugin modules management functions
 *****************************************************************************
 * Copyright (C) 2001-2007 the VideoLAN team
 * $Id$
 *
 * Authors: Sam Hocevar <sam@zoy.org>
 *          Ethan C. Baldridge <BaldridgeE@cadmus.com>
 *          Hans-Peter Jansen <hpj@urpla.net>
 *          Gildas Bazin <gbazin@videolan.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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <vlc_common.h>
#include <vlc_plugin.h>
#include "libvlc.h"

/* Some faulty libcs have a broken struct dirent when _FILE_OFFSET_BITS
 * is set to 64. Don't try to be cleverer. */
#ifdef _FILE_OFFSET_BITS
#undef _FILE_OFFSET_BITS
#endif

#include <stdlib.h>                                      /* free(), strtol() */
#include <stdio.h>                                              /* sprintf() */
#include <string.h>                                              /* strdup() */
#include <assert.h>

#ifdef HAVE_DIRENT_H
#   include <dirent.h>
#endif

#ifdef HAVE_SYS_TYPES_H
#   include <sys/types.h>
#endif
#ifdef HAVE_SYS_STAT_H
#   include <sys/stat.h>
#endif
#ifdef HAVE_UNISTD_H
#   include <unistd.h>
#endif

#if !defined(HAVE_DYNAMIC_PLUGINS)
    /* no support for plugins */
#elif defined(HAVE_DL_DYLD)
#   if defined(HAVE_MACH_O_DYLD_H)
#       include <mach-o/dyld.h>
#   endif
#elif defined(HAVE_DL_BEOS)
#   if defined(HAVE_IMAGE_H)
#       include <image.h>
#   endif
#elif defined(HAVE_DL_WINDOWS)
#   include <windows.h>
#elif defined(HAVE_DL_DLOPEN)
#   if defined(HAVE_DLFCN_H) /* Linux, BSD, Hurd */
#       include <dlfcn.h>
#   endif
#   if defined(HAVE_SYS_DL_H)
#       include <sys/dl.h>
#   endif
#elif defined(HAVE_DL_SHL_LOAD)
#   if defined(HAVE_DL_H)
#       include <dl.h>
#   endif
#endif

#include "config/configuration.h"

#include "vlc_charset.h"
#include "vlc_arrays.h"

#include "modules/modules.h"
#include "modules/builtin.h"

module_bank_t *p_module_bank;

/*****************************************************************************
 * Local prototypes
 *****************************************************************************/
#ifdef HAVE_DYNAMIC_PLUGINS
static void AllocateAllPlugins  ( vlc_object_t * );
static void AllocatePluginDir   ( vlc_object_t *, const char *, int );
static int  AllocatePluginFile  ( vlc_object_t *, char *, int64_t, int64_t );
static module_t * AllocatePlugin( vlc_object_t *, char * );
#endif
static int  AllocateBuiltinModule( vlc_object_t *, int ( * ) ( module_t * ) );
static void DeleteModule ( module_t *, bool );
#ifdef HAVE_DYNAMIC_PLUGINS
static void   DupModule        ( module_t * );
static void   UndupModule      ( module_t * );
#endif

/**
 * Init bank
 *
 * Creates a module bank structure which will be filled later
 * on with all the modules found.
 * \param p_this vlc object structure
 * \return nothing
 */
void __module_InitBank( vlc_object_t *p_this )
{
    module_bank_t *p_bank = NULL;

    vlc_mutex_t *lock = var_AcquireMutex( "libvlc" );

    if( p_module_bank == NULL )
    {
        p_bank = vlc_custom_create( p_this, sizeof(module_bank_t),
                                    VLC_OBJECT_GENERIC, "module bank");
        p_bank->i_usage = 1;
        p_bank->i_cache = p_bank->i_loaded_cache = 0;
        p_bank->pp_cache = p_bank->pp_loaded_cache = NULL;
        p_bank->b_cache = p_bank->b_cache_dirty =
        p_bank->b_cache_delete = false;

        /* Everything worked, attach the object */
        p_module_bank = p_bank;

        /* Fills the module bank structure with the main module infos.
         * This is very useful as it will allow us to consider the main
         * library just as another module, and for instance the configuration
         * options of main will be available in the module bank structure just
         * as for every other module. */
        AllocateBuiltinModule( p_this, vlc_entry__main );
    }
    else
        p_module_bank->i_usage++;

    vlc_mutex_unlock( lock );
}


/**
 * End bank
 *
 * Unloads all unused plugin modules and empties the module
 * bank in case of success.
 * \param p_this vlc object structure
 * \return nothing
 */
void __module_EndBank( vlc_object_t *p_this )
{
    module_t * p_next = NULL;

    vlc_mutex_t *lock = var_AcquireMutex( "libvlc" );
    if( !p_module_bank )
    {
        vlc_mutex_unlock( lock );
        return;
    }
    if( --p_module_bank->i_usage )
    {
        vlc_mutex_unlock( lock );
        return;
    }
    vlc_mutex_unlock( lock );

    /* Save the configuration */
    config_AutoSaveConfigFile( p_this );

#ifdef HAVE_DYNAMIC_PLUGINS
# define p_bank p_module_bank
    if( p_bank->b_cache ) CacheSave( p_this );
    while( p_bank->i_loaded_cache-- )
    {
        if( p_bank->pp_loaded_cache[p_bank->i_loaded_cache] )
        {
            DeleteModule(
                    p_bank->pp_loaded_cache[p_bank->i_loaded_cache]->p_module,
                    p_bank->pp_loaded_cache[p_bank->i_loaded_cache]->b_used );
            free( p_bank->pp_loaded_cache[p_bank->i_loaded_cache]->psz_file );
            free( p_bank->pp_loaded_cache[p_bank->i_loaded_cache] );
            p_bank->pp_loaded_cache[p_bank->i_loaded_cache] = NULL;
        }
    }
    if( p_bank->pp_loaded_cache )
    {
        free( p_bank->pp_loaded_cache );
        p_bank->pp_loaded_cache = NULL;
    }
    while( p_bank->i_cache-- )
    {
        free( p_bank->pp_cache[p_bank->i_cache]->psz_file );
        free( p_bank->pp_cache[p_bank->i_cache] );
        p_bank->pp_cache[p_bank->i_cache] = NULL;
    }
    if( p_bank->pp_cache )
    {
        free( p_bank->pp_cache );
        p_bank->pp_cache = NULL;
    }
# undef p_bank
#endif

    while( vlc_internals( p_module_bank )->i_children )
    {
        p_next = (module_t *)vlc_internals( p_module_bank )->pp_children[0];
        DeleteModule( p_next, true );
    }

    vlc_object_release( p_module_bank );
    p_module_bank = NULL;
}

/**
 * Load all modules which we built with.
 *
 * Fills the module bank structure with the builtin modules.
 * \param p_this vlc object structure
 * \return nothing
 */
void __module_LoadBuiltins( vlc_object_t * p_this )
{
    vlc_mutex_t *lock = var_AcquireMutex( "libvlc" );
    if( p_module_bank->b_builtins )
    {
        vlc_mutex_unlock( lock );
        return;
    }
    p_module_bank->b_builtins = true;
    vlc_mutex_unlock( lock );

    msg_Dbg( p_this, "checking builtin modules" );
    ALLOCATE_ALL_BUILTINS();
}

/**
 * Load all plugins
 *
 * Load all plugin modules we can find.
 * Fills the module bank structure with the plugin modules.
 * \param p_this vlc object structure
 * \return nothing
 */
void __module_LoadPlugins( vlc_object_t * p_this )
{
#ifdef HAVE_DYNAMIC_PLUGINS
    vlc_mutex_t *lock = var_AcquireMutex( "libvlc" );
    if( p_module_bank->b_plugins )
    {
        vlc_mutex_unlock( lock );
        return;
    }
    p_module_bank->b_plugins = true;
    vlc_mutex_unlock( lock );

    msg_Dbg( p_this, "checking plugin modules" );

    if( config_GetInt( p_this, "plugins-cache" ) )
        p_module_bank->b_cache = true;

    if( p_module_bank->b_cache ||
        p_module_bank->b_cache_delete ) CacheLoad( p_this );

    AllocateAllPlugins( p_this );
#endif
}

/**
 * Checks whether a module implements a capability.
 *
 * \param m the module
 * \param cap the capability to check
 * \return TRUE if the module have the capability
 */
bool module_IsCapable( const module_t *m, const char *cap )
{
    return !strcmp( m->psz_capability, cap );
}

/**
 * Get the internal name of a module
 *
 * \param m the module
 * \return the module name
 */
const char *module_GetObjName( const module_t *m )
{
    return m->psz_object_name;
}

/**
 * Get the human-friendly name of a module.
 *
 * \param m the module
 * \param long_name TRUE to have the long name of the module
 * \return the short or long name of the module
 */
const char *module_GetName( const module_t *m, bool long_name )
{
    if( long_name && ( m->psz_longname != NULL) )
        return m->psz_longname;

    return m->psz_shortname ?: m->psz_object_name;
}

/**
 * Get the help for a module
 *
 * \param m the module
 * \return the help
 */
const char *module_GetHelp( const module_t *m )
{
    return m->psz_help;
}

/**
 * module Need
 *
 * Return the best module function, given a capability list.
 *
 * If the p_this object doesn't have it's psz_object_name set, then
 * psz_object_name will be set to the module's name, unless the user
 * provided an alias using the "module name@alias" syntax in which case
 * psz_object_name will be set to the alias.
 *
 * \param p_this the vlc object
 * \param psz_capability list of capabilities needed
 * \param psz_name name of the module asked
 * \param b_strict TRUE yto use the strict mode
 * \return the module or NULL in case of a failure
 */
module_t * __module_Need( vlc_object_t *p_this, const char *psz_capability,
                          const char *psz_name, bool b_strict )
{
    typedef struct module_list_t module_list_t;

    stats_TimerStart( p_this, "module_Need()", STATS_TIMER_MODULE_NEED );

    struct module_list_t
    {
        module_t *p_module;
        int i_score;
        bool b_force;
        module_list_t *p_next;
    };

    module_list_t *p_list, *p_first, *p_tmp;
    vlc_list_t *p_all;

    int i_which_module, i_index = 0;

    module_t *p_module;

    int   i_shortcuts = 0;
    char *psz_shortcuts = NULL, *psz_var = NULL, *psz_alias = NULL;
    bool b_force_backup = p_this->b_force;


    /* Deal with variables */
    if( psz_name && psz_name[0] == '$' )
    {
        psz_name = psz_var = var_CreateGetString( p_this, psz_name + 1 );
    }

    /* Count how many different shortcuts were asked for */
    if( psz_name && *psz_name )
    {
        char *psz_parser, *psz_last_shortcut;

        /* If the user wants none, give him none. */
        if( !strcmp( psz_name, "none" ) )
        {
            free( psz_var );
            stats_TimerStop( p_this, STATS_TIMER_MODULE_NEED );
            stats_TimerDump( p_this, STATS_TIMER_MODULE_NEED );
            stats_TimerClean( p_this, STATS_TIMER_MODULE_NEED );
            return NULL;
        }

        i_shortcuts++;
        psz_shortcuts = psz_last_shortcut = strdup( psz_name );

        for( psz_parser = psz_shortcuts; *psz_parser; psz_parser++ )
        {
            if( *psz_parser == ',' )
            {
                 *psz_parser = '\0';
                 i_shortcuts++;
                 psz_last_shortcut = psz_parser + 1;
            }
        }

        /* Check if the user wants to override the "strict" mode */
        if( psz_last_shortcut )
        {
            if( !strcmp(psz_last_shortcut, "none") )
            {
                b_strict = true;
                i_shortcuts--;
            }
            else if( !strcmp(psz_last_shortcut, "any") )
            {
                b_strict = false;
                i_shortcuts--;
            }
        }
    }

    /* Sort the modules and test them */
    p_all = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
    p_list = malloc( p_all->i_count * sizeof( module_list_t ) );
    p_first = NULL;
    unsigned i_cpu = vlc_CPU();

    /* Parse the module list for capabilities and probe each of them */
    for( i_which_module = 0; i_which_module < p_all->i_count; i_which_module++ )
    {
        int i_shortcut_bonus = 0;

        p_module = (module_t *)p_all->p_values[i_which_module].p_object;

        /* Test that this module can do what we need */
        if( !module_IsCapable( p_module, psz_capability ) )
        {
            /* Don't recurse through the sub-modules because vlc_list_find()
             * will list them anyway. */
            continue;
        }

        /* Test if we have the required CPU */
        if( (p_module->i_cpu & i_cpu) != p_module->i_cpu )
        {
            continue;
        }

        /* If we required a shortcut, check this plugin provides it. */
        if( i_shortcuts > 0 )
        {
            bool b_trash;
            const char *psz_name = psz_shortcuts;

            /* Let's drop modules with a <= 0 score (unless they are
             * explicitly requested) */
            b_trash = p_module->i_score <= 0;

            for( unsigned i_short = i_shortcuts; i_short > 0; i_short-- )
            {
                for( unsigned i = 0; p_module->pp_shortcuts[i]; i++ )
                {
                    char *c;
                    if( ( c = strchr( psz_name, '@' ) )
                        ? !strncasecmp( psz_name, p_module->pp_shortcuts[i],
                                        c-psz_name )
                        : !strcasecmp( psz_name, p_module->pp_shortcuts[i] ) )
                    {
                        /* Found it */
                        if( c && c[1] )
                            psz_alias = c+1;
                        i_shortcut_bonus = i_short * 10000;
                        goto found_shortcut;
                    }
                }

                /* Go to the next shortcut... This is so lame! */
                psz_name += strlen( psz_name ) + 1;
            }

            /* If we are in "strict" mode and we couldn't
             * find the module in the list of provided shortcuts,
             * then kick the bastard out of here!!! */
            if( b_strict )
                continue;
        }
        /* If we didn't require a shortcut, trash <= 0 scored plugins */
        else if( p_module->i_score <= 0 )
        {
            continue;
        }

found_shortcut:

        /* Store this new module */
        p_list[ i_index ].p_module = p_module;
        p_list[ i_index ].i_score = p_module->i_score + i_shortcut_bonus;
        p_list[ i_index ].b_force = i_shortcut_bonus && b_strict;

        /* Add it to the modules-to-probe list */
        if( i_index == 0 )
        {
            p_list[ 0 ].p_next = NULL;
            p_first = p_list;
        }
        else
        {
            /* Ok, so at school you learned that quicksort is quick, and
             * bubble sort sucks raw eggs. But that's when dealing with
             * thousands of items. Here we have barely 50. */
            module_list_t *p_newlist = p_first;

            if( p_first->i_score < p_list[ i_index ].i_score )
            {
                p_list[ i_index ].p_next = p_first;
                p_first = &p_list[ i_index ];
            }
            else
            {
                while( p_newlist->p_next != NULL &&
                    p_newlist->p_next->i_score >= p_list[ i_index ].i_score )
                {
                    p_newlist = p_newlist->p_next;
                }

                p_list[ i_index ].p_next = p_newlist->p_next;
                p_newlist->p_next = &p_list[ i_index ];
            }
        }

        i_index++;
    }

    msg_Dbg( p_this, "looking for %s module: %i candidate%s", psz_capability,
                                            i_index, i_index == 1 ? "" : "s" );

    /* Lock all candidate modules */
    p_tmp = p_first;
    while( p_tmp != NULL )
    {
        vlc_object_yield( p_tmp->p_module );
        p_tmp = p_tmp->p_next;
    }

    /* We can release the list, interesting modules were yielded */
    vlc_list_release( p_all );

    /* Parse the linked list and use the first successful module */
    p_tmp = p_first;
    while( p_tmp != NULL )
    {
#ifdef HAVE_DYNAMIC_PLUGINS
        /* Make sure the module is loaded in mem */
        module_t *p_module = p_tmp->p_module;
        if( p_module->b_submodule )
            p_module = (module_t *)p_module->p_parent;

        if( !p_module->b_builtin && !p_module->b_loaded )
        {
            module_t *p_new_module =
                AllocatePlugin( p_this, p_module->psz_filename );
            if( p_new_module )
            {
                CacheMerge( p_this, p_module, p_new_module );
                vlc_object_attach( p_new_module, p_module );
                DeleteModule( p_new_module, true );
            }
        }
#endif

        p_this->b_force = p_tmp->b_force;
        if( p_tmp->p_module->pf_activate
             && p_tmp->p_module->pf_activate( p_this ) == VLC_SUCCESS )
        {
            break;
        }

        vlc_object_release( p_tmp->p_module );
        p_tmp = p_tmp->p_next;
    }

    /* Store the locked module value */
    if( p_tmp != NULL )
    {
        p_module = p_tmp->p_module;
        p_tmp = p_tmp->p_next;
    }
    else
    {
        p_module = NULL;
    }

    /* Unlock the remaining modules */
    while( p_tmp != NULL )
    {
        vlc_object_release( p_tmp->p_module );
        p_tmp = p_tmp->p_next;
    }

    free( p_list );
    p_this->b_force = b_force_backup;

    if( p_module != NULL )
    {
        msg_Dbg( p_this, "using %s module \"%s\"",
                 psz_capability, p_module->psz_object_name );
    }
    else if( p_first == NULL )
    {
        if( !strcmp( psz_capability, "access_demux" ) )
        {
            msg_Warn( p_this, "no %s module matched \"%s\"",
                 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
        }
        else
        {
            msg_Err( p_this, "no %s module matched \"%s\"",
                 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );

            msg_StackSet( VLC_EGENERIC, "no %s module matched \"%s\"",
                 psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
        }
    }
    else if( psz_name != NULL && *psz_name )
    {
        msg_Warn( p_this, "no %s module matching \"%s\" could be loaded",
                  psz_capability, (psz_name && *psz_name) ? psz_name : "any" );
    }
    else
        msg_StackSet( VLC_EGENERIC, "no suitable %s module", psz_capability );

    if( p_module && !p_this->psz_object_name )
    {
        /* This assumes that p_this is the object which will be using the
         * module. That's not always the case ... but it is in most cases.
         */
        if( psz_alias )
            p_this->psz_object_name = strdup( psz_alias );
        else
            p_this->psz_object_name = strdup( p_module->psz_object_name );
    }

    free( psz_shortcuts );
    free( psz_var );

    stats_TimerStop( p_this, STATS_TIMER_MODULE_NEED );
    stats_TimerDump( p_this, STATS_TIMER_MODULE_NEED );
    stats_TimerClean( p_this, STATS_TIMER_MODULE_NEED );

    /* Don't forget that the module is still locked */
    return p_module;
}

/**
 * Module unneed
 *
 * This function must be called by the thread that called module_Need, to
 * decrease the reference count and allow for hiding of modules.
 * \param p_this vlc object structure
 * \param p_module the module structure
 * \return nothing
 */
void __module_Unneed( vlc_object_t * p_this, module_t * p_module )
{
    /* Use the close method */
    if( p_module->pf_deactivate )
    {
        p_module->pf_deactivate( p_this );
    }

    msg_Dbg( p_this, "removing module \"%s\"", p_module->psz_object_name );

    vlc_object_release( p_module );
}

/**
 * Get a pointer to a module_t given it's name.
 *
 * \param p_this vlc object structure
 * \param psz_name the name of the module
 * \return a pointer to the module or NULL in case of a failure
 */
module_t *__module_Find( vlc_object_t *p_this, const char * psz_name )
{
    vlc_list_t *p_list;
    int i;
    p_list = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
    for( i = 0 ; i < p_list->i_count; i++)
    {
        module_t *p_module = ((module_t *) p_list->p_values[i].p_object);
        const char *psz_module_name = p_module->psz_object_name;
        if( psz_module_name && !strcmp( psz_module_name, psz_name ) )
        {
            /* We can release the list, and return yes */
            vlc_object_yield( p_module );
            vlc_list_release( p_list );
            return p_module;
        }
    }
    vlc_list_release( p_list );
    return NULL;
}


/**
 * Release a module_t pointer from module_Find().
 *
 * \param module the module to release
 * \return nothing
 */
void module_Put( module_t *module )
{
    vlc_object_release( module );
}


/**
 * Tell if a module exists and release it in thic case
 *
 * \param p_this vlc object structure
 * \param psz_name th name of the module
 * \return TRUE if the module exists
 */
bool __module_Exists( vlc_object_t *p_this, const char * psz_name )
{
    module_t *p_module = __module_Find( p_this, psz_name );
    if( p_module )
    {
        module_Put( p_module );
        return true;
    }
    else
    {
        return false;
    }
}

/**
 * GetModuleNamesForCapability
 *
 * Return a NULL terminated array with the names of the modules
 * that have a certain capability.
 * Free after uses both the string and the table.
 * \param p_this vlc object structure
 * \param psz_capability the capability asked
 * \param pppsz_longname an pointer to an array of string to contain
    the long names of the modules. If set to NULL the function don't use it.
 * \return the NULL terminated array
 */
char ** __module_GetModulesNamesForCapability( vlc_object_t *p_this,
                                               const char *psz_capability,
                                               char ***pppsz_longname )
{
    vlc_list_t *p_list;
    int i, j, count = 0;
    char **psz_ret;

    /* Do it in two passes : count the number of modules before */
    p_list = vlc_list_find( p_this, VLC_OBJECT_MODULE, FIND_ANYWHERE );
    for( i = 0 ; i < p_list->i_count; i++)
    {
        module_t *p_module = ((module_t *) p_list->p_values[i].p_object);
        const char *psz_module_capability = p_module->psz_capability;
        if( psz_module_capability && !strcmp( psz_module_capability, psz_capability ) )
            count++;
    }

    psz_ret = malloc( sizeof(char*) * (count+1) );
    if( pppsz_longname )
        *pppsz_longname = malloc( sizeof(char*) * (count+1) );
    if( !psz_ret || ( pppsz_longname && *pppsz_longname == NULL ) )
    {
        free( psz_ret );
        free( *pppsz_longname );
        *pppsz_longname = NULL;
        vlc_list_release( p_list );
        return NULL;
    }

    j = 0;
    for( i = 0 ; i < p_list->i_count; i++)
    {
        module_t *p_module = ((module_t *) p_list->p_values[i].p_object);
        const char *psz_module_capability = p_module->psz_capability;
        if( psz_module_capability && !strcmp( psz_module_capability, psz_capability ) )
        {
            int k = -1; /* hack to handle submodules properly */
            if( p_module->b_submodule )
            {
                while( p_module->pp_shortcuts[++k] != NULL );
                k--;
            }
            psz_ret[j] = strdup( k>=0?p_module->pp_shortcuts[k]
                                     :p_module->psz_object_name );
            if( pppsz_longname )
                (*pppsz_longname)[j] = strdup( module_GetName( p_module, true ) );
            j++;
        }
    }
    psz_ret[count] = NULL;

    vlc_list_release( p_list );

    return psz_ret;
}

/**
 * Get the configuration of a module
 *
 * \param module the module
 * \param psize the size of the configuration returned
 * \return the configuration as an array
 */
module_config_t *module_GetConfig( const module_t *module, unsigned *restrict psize )
{
    unsigned i,j;
    unsigned size = module->confsize;
    module_config_t *config = malloc( size * sizeof( *config ) );

    assert( psize != NULL );
    *psize = 0;

    if( !config )
        return NULL;

    for( i = 0, j = 0; i < size; i++ )
    {
        const module_config_t *item = module->p_config + i;
        if( item->b_internal /* internal option */
         || item->b_unsaveable /* non-modifiable option */
         || item->b_removed /* removed option */ )
            continue;

        memcpy( config + j, item, sizeof( *config ) );
        j++;
    }
    *psize = j;

    return config;
}

/**
 * Release the configuration
 *
 * \param the configuration
 * \return nothing
 */
void module_PutConfig( module_config_t *config )
{
    free( config );
}

/*****************************************************************************
 * Following functions are local.
 *****************************************************************************/

 /*****************************************************************************
 * copy_next_paths_token: from a PATH_SEP_CHAR (a ':' or a ';') separated paths
 * return first path.
 *****************************************************************************/
static char * copy_next_paths_token( char * paths, char ** remaining_paths )
{
    char * path;
    int i, done;
    bool escaped = false;

    assert( paths );

    /* Alloc a buffer to store the path */
    path = malloc( strlen( paths ) + 1 );
    if( !path ) return NULL;

    /* Look for PATH_SEP_CHAR (a ':' or a ';') */
    for( i = 0, done = 0 ; paths[i]; i++ )
    {
        /* Take care of \\ and \: or \; escapement */
        if( escaped )
        {
            escaped = false;
            path[done++] = paths[i];
        }
#ifdef WIN32
        else if( paths[i] == '/' )
            escaped = true;
#else
        else if( paths[i] == '\\' )
            escaped = true;
#endif
        else if( paths[i] == PATH_SEP_CHAR )
            break;
        else
            path[done++] = paths[i];
    }
    path[done++] = 0;

    /* Return the remaining paths */
    if( remaining_paths ) {
        *remaining_paths = paths[i] ? &paths[i]+1 : NULL;
    }

    return path;
}

/*****************************************************************************
 * AllocateAllPlugins: load all plugin modules we can find.
 *****************************************************************************/
#ifdef HAVE_DYNAMIC_PLUGINS
static void AllocateAllPlugins( vlc_object_t *p_this )
{
    const char *vlcpath = vlc_global()->psz_vlcpath;
    int count,i;
    char * path;
    vlc_array_t *arraypaths = vlc_array_new();

    /* Contruct the special search path for system that have a relocatable
     * executable. Set it to <vlc path>/modules and <vlc path>/plugins. */

    if( vlcpath && asprintf( &path, "%s" DIR_SEP "modules", vlcpath ) != -1 )
        vlc_array_append( arraypaths, path );
    if( vlcpath && asprintf( &path, "%s" DIR_SEP "plugins", vlcpath ) != -1 )
        vlc_array_append( arraypaths, path );
#ifndef WIN32
    vlc_array_append( arraypaths, strdup( PLUGIN_PATH ) );
#endif

    /* If the user provided a plugin path, we add it to the list */
    char *userpaths = config_GetPsz( p_this, "plugin-path" );
    char *paths_iter;

    for( paths_iter = userpaths; paths_iter; )
    {
        path = copy_next_paths_token( paths_iter, &paths_iter );
        if( path )
            vlc_array_append( arraypaths, path );
    }

    count = vlc_array_count( arraypaths );
    for( i = 0 ; i < count ; i++ )
    {
        path = vlc_array_item_at_index( arraypaths, i );
        if( !path )
            continue;