1 /*****************************************************************************
2 * variables.c: routines for object variables handling
3 *****************************************************************************
4 * Copyright (C) 2002-2009 the VideoLAN team
7 * Authors: Samuel Hocevar <sam@zoy.org>
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
22 *****************************************************************************/
24 /*****************************************************************************
26 *****************************************************************************/
31 #include <vlc_common.h>
32 #include <vlc_charset.h>
33 #include "variables.h"
39 /*****************************************************************************
41 *****************************************************************************/
42 struct callback_entry_t
44 vlc_callback_t pf_callback;
48 /*****************************************************************************
49 * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
50 *****************************************************************************/
51 static int CmpBool( vlc_value_t v, vlc_value_t w ) { return v.b_bool ? w.b_bool ? 0 : 1 : w.b_bool ? -1 : 0; }
52 static int CmpInt( vlc_value_t v, vlc_value_t w ) { return v.i_int == w.i_int ? 0 : v.i_int > w.i_int ? 1 : -1; }
53 static int CmpTime( vlc_value_t v, vlc_value_t w )
55 return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
57 static int CmpString( vlc_value_t v, vlc_value_t w )
60 return !w.psz_string ? 0 : -1;
62 return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
64 static int CmpFloat( vlc_value_t v, vlc_value_t w ) { return v.f_float == w.f_float ? 0 : v.f_float > w.f_float ? 1 : -1; }
65 static int CmpAddress( vlc_value_t v, vlc_value_t w ) { return v.p_address == w.p_address ? 0 : v.p_address > w.p_address ? 1 : -1; }
67 /*****************************************************************************
68 * Local duplication functions, and local deallocation functions
69 *****************************************************************************/
70 static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
71 static void DupString( vlc_value_t *p_val )
73 p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string : "" );
76 static void DupList( vlc_value_t *p_val )
79 vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
81 p_list->i_count = p_val->p_list->i_count;
82 if( p_val->p_list->i_count )
84 p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
85 p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
89 p_list->p_values = NULL;
90 p_list->pi_types = NULL;
93 for( i = 0; i < p_list->i_count; i++ )
95 p_list->p_values[i] = p_val->p_list->p_values[i];
96 p_list->pi_types[i] = p_val->p_list->pi_types[i];
97 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
101 DupString( &p_list->p_values[i] );
108 p_val->p_list = p_list;
111 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
112 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
113 static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
115 static void FreeList( vlc_value_t *p_val )
118 for( i = 0; i < p_val->p_list->i_count; i++ )
120 switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
123 FreeString( &p_val->p_list->p_values[i] );
126 FreeMutex( &p_val->p_list->p_values[i] );
133 if( p_val->p_list->i_count )
135 free( p_val->p_list->p_values );
136 free( p_val->p_list->pi_types );
138 free( p_val->p_list );
141 static const struct variable_ops_t
142 void_ops = { NULL, DupDummy, FreeDummy, },
143 addr_ops = { CmpAddress, DupDummy, FreeDummy, },
144 bool_ops = { CmpBool, DupDummy, FreeDummy, },
145 float_ops = { CmpFloat, DupDummy, FreeDummy, },
146 int_ops = { CmpInt, DupDummy, FreeDummy, },
147 list_ops = { CmpAddress, DupList, FreeList, },
148 mutex_ops = { CmpAddress, DupDummy, FreeMutex, },
149 string_ops = { CmpString, DupString, FreeString, },
150 time_ops = { CmpTime, DupDummy, FreeDummy, };
152 /*****************************************************************************
154 *****************************************************************************/
155 static void WaitUnused ( vlc_object_t *, variable_t * );
156 static uint32_t HashString ( const char * );
157 static size_t Insert ( variable_t **, size_t, const char * );
158 static int Lookup ( vlc_object_t *, const char * );
160 static void CheckValue ( variable_t *, vlc_value_t * );
162 static int TriggerCallback( vlc_object_t *, variable_t *, const char *,
165 static void Destroy( variable_t *p_var )
167 p_var->ops->pf_free( &p_var->val );
168 if( p_var->choices.i_count )
170 for( int i = 0 ; i < p_var->choices.i_count ; i++ )
172 p_var->ops->pf_free( &p_var->choices.p_values[i] );
173 free( p_var->choices_text.p_values[i].psz_string );
175 free( p_var->choices.p_values );
176 free( p_var->choices_text.p_values );
178 free( p_var->psz_name );
179 free( p_var->psz_text );
180 free( p_var->p_entries );
185 * Initialize a vlc variable
187 * We hash the given string and insert it into the sorted list. The insertion
188 * may require slow memory copies, but think about what we gain in the log(n)
189 * lookup phase when setting/getting the variable value!
191 * \param p_this The object in which to create the variable
192 * \param psz_name The name of the variable
193 * \param i_type The variables type. Must be one of \ref var_type combined with
194 * zero or more \ref var_flags
196 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
198 static vlc_list_t dummy_null_list = {0, NULL, NULL};
201 variable_t *p_var = calloc( 1, sizeof( *p_var ) );
205 p_var->i_hash = HashString( psz_name );
206 p_var->psz_name = strdup( psz_name );
207 p_var->psz_text = NULL;
209 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
213 p_var->i_default = -1;
214 p_var->choices.i_count = 0;
215 p_var->choices.p_values = NULL;
216 p_var->choices_text.i_count = 0;
217 p_var->choices_text.p_values = NULL;
219 p_var->b_incallback = false;
220 p_var->i_entries = 0;
221 p_var->p_entries = NULL;
223 /* Always initialize the variable, even if it is a list variable; this
224 * will lead to errors if the variable is not initialized, but it will
225 * not cause crashes in the variable handling. */
226 switch( i_type & VLC_VAR_CLASS )
229 p_var->ops = &bool_ops;
230 p_var->val.b_bool = false;
232 case VLC_VAR_INTEGER:
233 p_var->ops = &int_ops;
234 p_var->val.i_int = 0;
237 p_var->ops = &string_ops;
238 p_var->val.psz_string = NULL;
241 p_var->ops = &float_ops;
242 p_var->val.f_float = 0.0;
245 p_var->ops = &time_ops;
246 p_var->val.i_time = 0;
248 case VLC_VAR_ADDRESS:
249 p_var->ops = &addr_ops;
250 p_var->val.p_address = NULL;
253 p_var->ops = &mutex_ops;
254 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
255 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
258 p_var->ops = &list_ops;
259 p_var->val.p_list = &dummy_null_list;
262 p_var->ops = &void_ops;
266 if( i_type & VLC_VAR_DOINHERIT )
268 if( var_Inherit( p_this, psz_name, i_type, &p_var->val ) )
269 msg_Err( p_this, "cannot inherit value for %s", psz_name );
270 else if( i_type & VLC_VAR_HASCHOICE )
272 /* We must add the inherited value to our choice list */
273 p_var->i_default = 0;
275 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
277 INSERT_ELEM( p_var->choices_text.p_values,
278 p_var->choices_text.i_count, 0, p_var->val );
279 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
280 p_var->choices_text.p_values[0].psz_string = NULL;
284 vlc_object_internals_t *p_priv = vlc_internals( p_this );
287 vlc_mutex_lock( &p_priv->var_lock );
289 /* FIXME: if the variable already exists, we don't duplicate it. But we
290 * duplicate the lookups. It's not that serious, but if anyone finds some
291 * time to rework Insert() so that only one lookup has to be done, feel
293 i_new = Lookup( p_this, psz_name );
297 /* If the types differ, variable creation failed. */
298 if( (i_type & VLC_VAR_CLASS) != (p_priv->pp_vars[i_new]->i_type & VLC_VAR_CLASS) )
300 msg_Err( p_this, "Variable '%s' (0x%04x) already exist but with a different type (0x%04x)",
301 psz_name, p_priv->pp_vars[i_new]->i_type, i_type );
302 vlc_mutex_unlock( &p_priv->var_lock );
306 p_priv->pp_vars[i_new]->i_usage++;
307 p_priv->pp_vars[i_new]->i_type |= ( i_type & VLC_VAR_ISCOMMAND );
308 p_priv->pp_vars[i_new]->i_type |= ( i_type & VLC_VAR_HASCHOICE );
309 vlc_mutex_unlock( &p_priv->var_lock );
311 /* We did not need to create a new variable, free everything... */
316 i_new = Insert( p_priv->pp_vars, p_priv->i_vars, psz_name );
318 if( (p_priv->i_vars & 15) == 0 )
319 p_priv->pp_vars = xrealloc( p_priv->pp_vars,
320 (p_priv->i_vars+16) * sizeof(variable_t *) );
322 memmove( p_priv->pp_vars + i_new + 1,
323 p_priv->pp_vars + i_new,
324 (p_priv->i_vars - i_new) * sizeof(variable_t *) );
328 p_priv->pp_vars[i_new] = p_var;
329 vlc_mutex_unlock( &p_priv->var_lock );
335 * Destroy a vlc variable
337 * Look for the variable and destroy it if it is found. As in var_Create we
338 * do a call to memmove() but we have performance counterparts elsewhere.
340 * \param p_this The object that holds the variable
341 * \param psz_name The name of the variable
343 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
350 vlc_object_internals_t *p_priv = vlc_internals( p_this );
352 vlc_mutex_lock( &p_priv->var_lock );
354 i_var = Lookup( p_this, psz_name );
357 vlc_mutex_unlock( &p_priv->var_lock );
361 p_var = p_priv->pp_vars[i_var];
362 WaitUnused( p_this, p_var );
364 if( p_var->i_usage > 1 )
367 vlc_mutex_unlock( &p_priv->var_lock );
372 memmove( p_priv->pp_vars + i_var,
373 p_priv->pp_vars + i_var + 1,
374 (p_priv->i_vars - i_var) * sizeof(variable_t *) );
376 if( p_priv->i_vars == 0 )
378 free( p_priv->pp_vars );
379 p_priv->pp_vars = NULL;
382 if( (p_priv->i_vars & 15) == 0 )
384 variable_t **pp_vars = realloc( p_priv->pp_vars,
385 (p_priv->i_vars) * sizeof(variable_t *) );
386 if( pp_vars != NULL )
387 p_priv->pp_vars = pp_vars;
389 vlc_mutex_unlock( &p_priv->var_lock );
396 * Perform an action on a variable
398 * \param p_this The object that holds the variable
399 * \param psz_name The name of the variable
400 * \param i_action The action to perform. Must be one of \ref var_action
401 * \param p_val First action parameter
402 * \param p_val2 Second action parameter
404 int __var_Change( vlc_object_t *p_this, const char *psz_name,
405 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
414 vlc_object_internals_t *p_priv = vlc_internals( p_this );
416 vlc_mutex_lock( &p_priv->var_lock );
418 i_var = Lookup( p_this, psz_name );
422 vlc_mutex_unlock( &p_priv->var_lock );
426 p_var = p_priv->pp_vars[i_var];
431 if( p_var->i_type & VLC_VAR_HASMIN )
433 p_var->ops->pf_free( &p_var->min );
435 p_var->i_type |= VLC_VAR_HASMIN;
437 p_var->ops->pf_dup( &p_var->min );
438 CheckValue( p_var, &p_var->val );
441 if( p_var->i_type & VLC_VAR_HASMIN )
447 if( p_var->i_type & VLC_VAR_HASMAX )
449 p_var->ops->pf_free( &p_var->max );
451 p_var->i_type |= VLC_VAR_HASMAX;
453 p_var->ops->pf_dup( &p_var->max );
454 CheckValue( p_var, &p_var->val );
457 if( p_var->i_type & VLC_VAR_HASMAX )
462 case VLC_VAR_SETSTEP:
463 if( p_var->i_type & VLC_VAR_HASSTEP )
465 p_var->ops->pf_free( &p_var->step );
467 p_var->i_type |= VLC_VAR_HASSTEP;
468 p_var->step = *p_val;
469 p_var->ops->pf_dup( &p_var->step );
470 CheckValue( p_var, &p_var->val );
472 case VLC_VAR_GETSTEP:
473 if( p_var->i_type & VLC_VAR_HASSTEP )
475 *p_val = p_var->step;
478 case VLC_VAR_ADDCHOICE:
479 i = p_var->choices.i_count;
481 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
483 INSERT_ELEM( p_var->choices_text.p_values,
484 p_var->choices_text.i_count, i, *p_val );
485 p_var->ops->pf_dup( &p_var->choices.p_values[i] );
486 p_var->choices_text.p_values[i].psz_string =
487 ( p_val2 && p_val2->psz_string ) ?
488 strdup( p_val2->psz_string ) : NULL;
490 CheckValue( p_var, &p_var->val );
492 case VLC_VAR_DELCHOICE:
493 for( i = 0 ; i < p_var->choices.i_count ; i++ )
495 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
501 if( i == p_var->choices.i_count )
504 vlc_mutex_unlock( &p_priv->var_lock );
508 if( p_var->i_default > i )
512 else if( p_var->i_default == i )
514 p_var->i_default = -1;
517 p_var->ops->pf_free( &p_var->choices.p_values[i] );
518 free( p_var->choices_text.p_values[i].psz_string );
519 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
520 REMOVE_ELEM( p_var->choices_text.p_values,
521 p_var->choices_text.i_count, i );
523 CheckValue( p_var, &p_var->val );
525 case VLC_VAR_CHOICESCOUNT:
526 p_val->i_int = p_var->choices.i_count;
528 case VLC_VAR_CLEARCHOICES:
529 for( i = 0 ; i < p_var->choices.i_count ; i++ )
531 p_var->ops->pf_free( &p_var->choices.p_values[i] );
533 for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
534 free( p_var->choices_text.p_values[i].psz_string );
536 if( p_var->choices.i_count ) free( p_var->choices.p_values );
537 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
539 p_var->choices.i_count = 0;
540 p_var->choices.p_values = NULL;
541 p_var->choices_text.i_count = 0;
542 p_var->choices_text.p_values = NULL;
543 p_var->i_default = -1;
545 case VLC_VAR_SETDEFAULT:
546 /* FIXME: the list is sorted, dude. Use something cleverer. */
547 for( i = 0 ; i < p_var->choices.i_count ; i++ )
549 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
555 if( i == p_var->choices.i_count )
561 p_var->i_default = i;
562 CheckValue( p_var, &p_var->val );
564 case VLC_VAR_SETVALUE:
565 /* Duplicate data if needed */
567 p_var->ops->pf_dup( &newval );
568 /* Backup needed stuff */
570 /* Check boundaries and list */
571 CheckValue( p_var, &newval );
572 /* Set the variable */
574 /* Free data if needed */
575 p_var->ops->pf_free( &oldval );
577 case VLC_VAR_GETCHOICES:
578 case VLC_VAR_GETLIST:
579 p_val->p_list = malloc( sizeof(vlc_list_t) );
580 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
581 if( p_var->choices.i_count )
583 p_val->p_list->p_values = malloc( p_var->choices.i_count
584 * sizeof(vlc_value_t) );
585 p_val->p_list->pi_types = malloc( p_var->choices.i_count
589 p_val2->p_list->p_values =
590 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
591 p_val2->p_list->pi_types =
592 malloc( p_var->choices.i_count * sizeof(int) );
595 p_val->p_list->i_count = p_var->choices.i_count;
596 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
597 for( i = 0 ; i < p_var->choices.i_count ; i++ )
599 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
600 p_val->p_list->pi_types[i] = p_var->i_type;
601 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
604 p_val2->p_list->p_values[i].psz_string =
605 p_var->choices_text.p_values[i].psz_string ?
606 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
607 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
611 case VLC_VAR_SETTEXT:
612 free( p_var->psz_text );
613 if( p_val && p_val->psz_string )
614 p_var->psz_text = strdup( p_val->psz_string );
616 p_var->psz_text = NULL;
618 case VLC_VAR_GETTEXT:
619 p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
622 case VLC_VAR_SETISCOMMAND:
623 p_var->i_type |= VLC_VAR_ISCOMMAND;
630 vlc_mutex_unlock( &p_priv->var_lock );
637 * Perform a Get and Set on a variable
639 * \param p_this: The object that hold the variable
640 * \param psz_name: the name of the variable
641 * \param i_action: the action to perform
642 * \param p_val: The action parameter
643 * \return vlc error codes
645 int __var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
655 vlc_object_internals_t *p_priv = vlc_internals( p_this );
657 vlc_mutex_lock( &p_priv->var_lock );
658 i_var = Lookup( p_this, psz_name );
661 vlc_mutex_unlock( &p_priv->var_lock );
665 p_var = p_priv->pp_vars[i_var];
666 WaitUnused( p_this, p_var );
668 /* Duplicated data if needed */
669 //p_var->ops->pf_dup( &val );
671 /* Backup needed stuff */
674 /* depending of the action requiered */
677 case VLC_VAR_TOGGLE_BOOL:
678 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
679 p_var->val.b_bool = !p_var->val.b_bool;
681 case VLC_VAR_INTEGER_INCDEC:
682 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
683 p_var->val.i_int += val.i_int;
686 vlc_mutex_unlock( &p_priv->var_lock );
690 /* Check boundaries */
691 CheckValue( p_var, &p_var->val );
693 /* Deal with callbacks.*/
694 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
696 vlc_mutex_unlock( &p_priv->var_lock );
703 * Request a variable's type
705 * \return The variable type if it exists, or 0 if the
706 * variable could not be found.
709 int __var_Type( vlc_object_t *p_this, const char *psz_name )
715 vlc_object_internals_t *p_priv = vlc_internals( p_this );
717 vlc_mutex_lock( &p_priv->var_lock );
719 i_var = Lookup( p_this, psz_name );
723 vlc_mutex_unlock( &p_priv->var_lock );
727 i_type = p_priv->pp_vars[i_var]->i_type;
729 vlc_mutex_unlock( &p_priv->var_lock );
734 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
735 int expected_type, vlc_value_t val )
738 int i_ret = VLC_SUCCESS;
744 vlc_object_internals_t *p_priv = vlc_internals( p_this );
746 vlc_mutex_lock( &p_priv->var_lock );
748 i_var = Lookup( p_this, psz_name );
751 vlc_mutex_unlock( &p_priv->var_lock );
755 p_var = p_priv->pp_vars[i_var];
756 assert( expected_type == 0 ||
757 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
759 WaitUnused( p_this, p_var );
761 /* Duplicate data if needed */
762 p_var->ops->pf_dup( &val );
764 /* Backup needed stuff */
767 /* Check boundaries and list */
768 CheckValue( p_var, &val );
770 /* Set the variable */
773 /* Deal with callbacks */
774 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
776 /* Free data if needed */
777 p_var->ops->pf_free( &oldval );
779 vlc_mutex_unlock( &p_priv->var_lock );
786 * Set a variable's value
788 * \param p_this The object that hold the variable
789 * \param psz_name The name of the variable
790 * \param val the value to set
792 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
794 return var_SetChecked( p_this, psz_name, 0, val );
797 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
798 int expected_type, vlc_value_t *p_val )
802 vlc_object_internals_t *p_priv = vlc_internals( p_this );
803 int i_var, err = VLC_SUCCESS;
805 vlc_mutex_lock( &p_priv->var_lock );
807 i_var = Lookup( p_this, psz_name );
810 variable_t *p_var = p_priv->pp_vars[i_var];
812 assert( expected_type == 0 ||
813 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
815 /* Really get the variable */
819 /* Alert if the type is VLC_VAR_VOID */
820 if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
821 msg_Warn( p_this, "Calling var_GetVoid on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
824 /* Duplicate value if needed */
825 p_var->ops->pf_dup( p_val );
830 vlc_mutex_unlock( &p_priv->var_lock );
835 * Get a variable's value
837 * \param p_this The object that holds the variable
838 * \param psz_name The name of the variable
839 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
840 * after the function is finished
842 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
844 return var_GetChecked( p_this, psz_name, 0, p_val );
848 * Register a callback in a variable
850 * We store a function pointer that will be called upon variable
853 * \param p_this The object that holds the variable
854 * \param psz_name The name of the variable
855 * \param pf_callback The function pointer
856 * \param p_data A generic pointer that will be passed as the last
857 * argument to the callback function.
859 * \warning The callback function is run in the thread that calls var_Set on
860 * the variable. Use proper locking. This thread may not have much
861 * time to spare, so keep callback functions short.
863 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
864 vlc_callback_t pf_callback, void *p_data )
868 callback_entry_t entry;
872 vlc_object_internals_t *p_priv = vlc_internals( p_this );
874 entry.pf_callback = pf_callback;
875 entry.p_data = p_data;
877 vlc_mutex_lock( &p_priv->var_lock );
879 i_var = Lookup( p_this, psz_name );
883 msg_Warn( p_this, "Failed to add a callback to the non-existing "
884 "variable '%s'", psz_name );
886 vlc_mutex_unlock( &p_priv->var_lock );
890 p_var = p_priv->pp_vars[i_var];
892 WaitUnused( p_this, p_var );
893 INSERT_ELEM( p_var->p_entries,
898 vlc_mutex_unlock( &p_priv->var_lock );
904 * Remove a callback from a variable
906 * pf_callback and p_data have to be given again, because different objects
907 * might have registered the same callback function.
909 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
910 vlc_callback_t pf_callback, void *p_data )
915 bool b_found_similar = false;
920 vlc_object_internals_t *p_priv = vlc_internals( p_this );
922 vlc_mutex_lock( &p_priv->var_lock );
924 i_var = Lookup( p_this, psz_name );
927 vlc_mutex_unlock( &p_priv->var_lock );
931 p_var = p_priv->pp_vars[i_var];
932 WaitUnused( p_this, p_var );
934 for( i_entry = p_var->i_entries ; i_entry-- ; )
936 if( p_var->p_entries[i_entry].pf_callback == pf_callback
937 && p_var->p_entries[i_entry].p_data == p_data )
942 else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
943 b_found_similar = true;
950 if( b_found_similar )
951 fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
952 "function but not the same data.", psz_name );
955 vlc_mutex_unlock( &p_priv->var_lock );
959 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
961 vlc_mutex_unlock( &p_priv->var_lock );
967 * Trigger callback on a variable
969 * \param p_this The object that hold the variable
970 * \param psz_name The name of the variable
972 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
980 vlc_object_internals_t *p_priv = vlc_internals( p_this );
982 vlc_mutex_lock( &p_priv->var_lock );
984 i_var = Lookup( p_this, psz_name );
987 vlc_mutex_unlock( &p_priv->var_lock );
991 p_var = p_priv->pp_vars[i_var];
992 WaitUnused( p_this, p_var );
994 /* Deal with callbacks. Tell we're in a callback, release the lock,
995 * call stored functions, retake the lock. */
996 i_ret = TriggerCallback( p_this, p_var, psz_name, p_var->val );
998 vlc_mutex_unlock( &p_priv->var_lock );
1002 /** Parse a stringified option
1003 * This function parse a string option and create the associated object
1005 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1006 * option name and bar is the value of the option.
1007 * \param p_obj the object in which the variable must be created
1008 * \param psz_option the option to parse
1009 * \param trusted whether the option is set by a trusted input or not
1012 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1015 char *psz_name, *psz_value;
1017 bool b_isno = false;
1020 val.psz_string = NULL;
1022 /* It's too much of a hassle to remove the ':' when we parse
1023 * the cmd line :) */
1024 if( psz_option[0] == ':' )
1027 if( !psz_option[0] )
1030 psz_name = strdup( psz_option );
1031 if( psz_name == NULL )
1034 psz_value = strchr( psz_name, '=' );
1035 if( psz_value != NULL )
1036 *psz_value++ = '\0';
1038 /* FIXME: :programs should be handled generically */
1039 if( !strcmp( psz_name, "programs" ) )
1040 i_type = VLC_VAR_LIST;
1042 i_type = config_GetType( p_obj, psz_name );
1044 if( !i_type && !psz_value )
1046 /* check for "no-foo" or "nofoo" */
1047 if( !strncmp( psz_name, "no-", 3 ) )
1049 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1051 else if( !strncmp( psz_name, "no", 2 ) )
1053 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1055 else goto cleanup; /* Option doesn't exist */
1058 i_type = config_GetType( p_obj, psz_name );
1060 if( !i_type ) goto cleanup; /* Option doesn't exist */
1062 if( ( i_type != VLC_VAR_BOOL ) &&
1063 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1065 /* check if option is unsafe */
1068 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1069 if( !p_config || !p_config->b_safe )
1071 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1072 "security reasons", psz_name );
1078 /* Create the variable in the input object.
1079 * Children of the input object will be able to retreive this value
1080 * thanks to the inheritance property of the object variables. */
1081 __var_Create( p_obj, psz_name, i_type );
1086 val.b_bool = !b_isno;
1089 case VLC_VAR_INTEGER:
1090 val.i_int = strtol( psz_value, NULL, 0 );
1094 val.f_float = us_atof( psz_value );
1097 case VLC_VAR_STRING:
1098 case VLC_VAR_MODULE:
1100 case VLC_VAR_DIRECTORY:
1101 val.psz_string = psz_value;
1106 char *psz_orig, *psz_var;
1107 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1108 val.p_list = p_list;
1109 p_list->i_count = 0;
1111 psz_var = psz_orig = strdup(psz_value);
1112 while( psz_var && *psz_var )
1114 char *psz_item = psz_var;
1116 while( *psz_var && *psz_var != ',' ) psz_var++;
1117 if( *psz_var == ',' )
1122 val2.i_int = strtol( psz_item, NULL, 0 );
1123 INSERT_ELEM( p_list->p_values, p_list->i_count,
1124 p_list->i_count, val2 );
1125 /* p_list->i_count is incremented twice by INSERT_ELEM */
1127 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1128 p_list->i_count, VLC_VAR_INTEGER );
1138 __var_Set( p_obj, psz_name, val );
1140 /* If that's a list, remove all elements allocated */
1141 if( i_type == VLC_VAR_LIST )
1149 /* Following functions are local */
1152 * Waits until the variable is inactive (i.e. not executing a callback)
1154 static void WaitUnused( vlc_object_t *p_this, variable_t *p_var )
1156 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1158 mutex_cleanup_push( &p_priv->var_lock );
1159 while( p_var->b_incallback )
1160 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1164 /*****************************************************************************
1165 * HashString: our cool hash function
1166 *****************************************************************************
1167 * This function is not intended to be crypto-secure, we only want it to be
1168 * fast and not suck too much. This one is pretty fast and did 0 collisions
1169 * in wenglish's dictionary.
1170 *****************************************************************************/
1171 static uint32_t HashString( const char *psz_string )
1173 uint32_t i_hash = 0;
1175 while( *psz_string )
1177 i_hash += *psz_string++;
1178 i_hash += i_hash << 10;
1179 i_hash ^= i_hash >> 8;
1185 /*****************************************************************************
1186 * Insert: find the slot where to insert a variable
1187 *****************************************************************************/
1188 static size_t Insert( variable_t **pp_vars, size_t n, const char *psz_name )
1191 uint32_t hash = HashString( psz_name );
1198 size_t middle = n / 2;
1200 if( hash < pp_vars[middle]->i_hash )
1212 if( hash >= pp_vars[0]->i_hash )
1217 static int u32cmp( const void *key, const void *data )
1219 const variable_t *const *pp_var = data;
1220 uint32_t hash = *(const uint32_t *)key ;
1222 if( hash > (*pp_var)->i_hash )
1224 if( hash < (*pp_var)->i_hash )
1229 /*****************************************************************************
1230 * Lookup: find an existing variable given its name
1231 *****************************************************************************
1232 * We use a recursive inner function indexed on the hash. Care is taken of
1233 * possible hash collisions.
1234 *****************************************************************************/
1235 static int Lookup( vlc_object_t *obj, const char *psz_name )
1237 vlc_object_internals_t *priv = vlc_internals( obj );
1238 variable_t *const *pp_vars = priv->pp_vars;
1239 size_t i_vars = priv->i_vars;
1240 variable_t *const *pp_var;
1241 uint32_t i_hash = HashString( psz_name );
1243 pp_var = bsearch( &i_hash, pp_vars, i_vars, sizeof( *pp_var ), u32cmp );
1245 /* Hash not found */
1246 if( pp_var == NULL )
1249 assert( i_vars > 0 );
1251 /* Find the first entry with the right hash */
1252 while( (pp_var > pp_vars) && (i_hash == pp_var[-1]->i_hash) )
1255 assert( (*pp_var)->i_hash == i_hash );
1257 /* Hash collision should be very unlikely, but we cannot guarantee
1258 * it will never happen. So we do an exhaustive search amongst all
1259 * entries with the same hash. Typically, there is only one anyway. */
1260 for( variable_t *const *p_end = pp_vars + i_vars;
1261 (pp_var < p_end) && (i_hash == (*pp_var)->i_hash);
1264 if( !strcmp( psz_name, (*pp_var)->psz_name ) )
1265 return pp_var - pp_vars;
1268 /* Hash found, but entry not found */
1272 /*****************************************************************************
1273 * CheckValue: check that a value is valid wrt. a variable
1274 *****************************************************************************
1275 * This function checks p_val's value against p_var's limitations such as
1276 * minimal and maximal value, step, in-list position, and modifies p_val if
1278 ****************************************************************************/
1279 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1281 /* Check that our variable is in the list */
1282 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1286 /* This list is not sorted so go throug it (this is a small list) */
1287 for( i = p_var->choices.i_count ; i-- ; )
1289 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1295 /* If not found, change it to anything vaguely valid */
1298 /* Free the old variable, get the new one, dup it */
1299 p_var->ops->pf_free( p_val );
1300 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1301 ? p_var->i_default : 0 ];
1302 p_var->ops->pf_dup( p_val );
1306 /* Check that our variable is within the bounds */
1307 switch( p_var->i_type & VLC_VAR_TYPE )
1309 case VLC_VAR_INTEGER:
1310 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1311 && (p_val->i_int % p_var->step.i_int) )
1313 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1314 / p_var->step.i_int * p_var->step.i_int;
1316 if( p_var->i_type & VLC_VAR_HASMIN
1317 && p_val->i_int < p_var->min.i_int )
1319 p_val->i_int = p_var->min.i_int;
1321 if( p_var->i_type & VLC_VAR_HASMAX
1322 && p_val->i_int > p_var->max.i_int )
1324 p_val->i_int = p_var->max.i_int;
1328 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1330 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1331 p_val->f_float / p_var->step.f_float );
1332 if( p_val->f_float != f_round )
1334 p_val->f_float = f_round;
1337 if( p_var->i_type & VLC_VAR_HASMIN
1338 && p_val->f_float < p_var->min.f_float )
1340 p_val->f_float = p_var->min.f_float;
1342 if( p_var->i_type & VLC_VAR_HASMAX
1343 && p_val->f_float > p_var->max.f_float )
1345 p_val->f_float = p_var->max.f_float;
1355 * Finds the value of a variable. If the specified object does not hold a
1356 * variable with the specified name, try the parent object, and iterate until
1357 * the top of the tree. If no match is found, the value is read from the
1360 int var_Inherit( vlc_object_t *p_this, const char *psz_name, int i_type,
1361 vlc_value_t *p_val )
1363 i_type &= VLC_VAR_CLASS;
1364 for( vlc_object_t *obj = p_this; obj != NULL; obj = obj->p_parent )
1365 if( var_GetChecked( obj, psz_name, i_type, p_val ) == VLC_SUCCESS )
1368 /* else take value from config */
1369 switch( i_type & VLC_VAR_CLASS )
1371 case VLC_VAR_STRING:
1372 p_val->psz_string = config_GetPsz( p_this, psz_name );
1373 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1376 p_val->f_float = config_GetFloat( p_this, psz_name );
1378 case VLC_VAR_INTEGER:
1379 p_val->i_int = config_GetInt( p_this, psz_name );
1382 p_val->b_bool = config_GetInt( p_this, psz_name );
1386 char *psz_orig, *psz_var;
1387 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1388 p_val->p_list = p_list;
1389 p_list->i_count = 0;
1391 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1392 while( psz_var && *psz_var )
1394 char *psz_item = psz_var;
1396 while( *psz_var && *psz_var != ',' ) psz_var++;
1397 if( *psz_var == ',' )
1402 val.i_int = strtol( psz_item, NULL, 0 );
1403 INSERT_ELEM( p_list->p_values, p_list->i_count,
1404 p_list->i_count, val );
1405 /* p_list->i_count is incremented twice by INSERT_ELEM */
1407 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1408 p_list->i_count, VLC_VAR_INTEGER );
1414 msg_Warn( p_this, "Could not inherit value for var %s "
1415 "from config. Invalid Type", psz_name );
1418 /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1423 /**********************************************************************
1424 * Trigger the callbacks.
1425 * Tell we're in a callback, release the lock, call stored functions,
1427 **********************************************************************/
1428 static int TriggerCallback( vlc_object_t *p_this, variable_t *p_var,
1429 const char *psz_name, vlc_value_t oldval )
1433 int i_entries = p_var->i_entries;
1434 if( i_entries == 0 )
1437 callback_entry_t *p_entries = p_var->p_entries;
1438 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1440 assert( !p_var->b_incallback );
1441 p_var->b_incallback = true;
1442 vlc_mutex_unlock( &p_priv->var_lock );
1444 /* The real calls */
1445 for( ; i_entries-- ; )
1447 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, p_var->val,
1448 p_entries[i_entries].p_data );
1451 vlc_mutex_lock( &p_priv->var_lock );
1452 p_var->b_incallback = false;
1453 vlc_cond_broadcast( &p_priv->var_wait );
1459 /**********************************************************************
1460 * Execute a var command on an object identified by its name
1461 **********************************************************************/
1462 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1463 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1465 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1466 psz_name, FIND_CHILD );
1472 *psz_msg = strdup( "Unknown destination object." );
1476 i_type = var_Type( p_obj, psz_cmd );
1477 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1479 vlc_object_release( p_obj );
1481 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1482 return VLC_EGENERIC;
1485 i_type &= VLC_VAR_CLASS;
1488 case VLC_VAR_INTEGER:
1489 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1492 i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
1494 case VLC_VAR_STRING:
1495 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1498 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1501 i_ret = VLC_EGENERIC;
1505 vlc_object_release( p_obj );
1509 if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1510 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1519 * Free a list and the associated strings
1520 * @param p_val: the list variable
1521 * @param p_val2: the variable associated or NULL
1523 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1526 if( p_val2 && p_val2->p_list )
1528 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1529 free( p_val2->p_list->p_values[i].psz_string );
1530 if( p_val2->p_list->i_count )
1532 free( p_val2->p_list->p_values );
1533 free( p_val2->p_list->pi_types );
1535 free( p_val2->p_list );