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 int GetUnused ( vlc_object_t *, const char * );
156 static uint32_t HashString ( const char * );
157 static int Insert ( variable_t **, int, const char * );
158 static int InsertInner ( variable_t **, int, uint32_t );
159 static int Lookup ( vlc_object_t *, const char * );
161 static void CheckValue ( variable_t *, vlc_value_t * );
163 static int TriggerCallback( vlc_object_t *, variable_t *, const char *,
166 static void Destroy( variable_t *p_var )
168 p_var->ops->pf_free( &p_var->val );
169 if( p_var->choices.i_count )
171 for( int i = 0 ; i < p_var->choices.i_count ; i++ )
173 p_var->ops->pf_free( &p_var->choices.p_values[i] );
174 free( p_var->choices_text.p_values[i].psz_string );
176 free( p_var->choices.p_values );
177 free( p_var->choices_text.p_values );
179 free( p_var->psz_name );
180 free( p_var->psz_text );
181 free( p_var->p_entries );
186 * Initialize a vlc variable
188 * We hash the given string and insert it into the sorted list. The insertion
189 * may require slow memory copies, but think about what we gain in the log(n)
190 * lookup phase when setting/getting the variable value!
192 * \param p_this The object in which to create the variable
193 * \param psz_name The name of the variable
194 * \param i_type The variables type. Must be one of \ref var_type combined with
195 * zero or more \ref var_flags
197 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
199 static vlc_list_t dummy_null_list = {0, NULL, NULL};
202 variable_t *p_var = calloc( 1, sizeof( *p_var ) );
206 p_var->i_hash = HashString( psz_name );
207 p_var->psz_name = strdup( psz_name );
208 p_var->psz_text = NULL;
210 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
214 p_var->i_default = -1;
215 p_var->choices.i_count = 0;
216 p_var->choices.p_values = NULL;
217 p_var->choices_text.i_count = 0;
218 p_var->choices_text.p_values = NULL;
220 p_var->b_incallback = false;
221 p_var->i_entries = 0;
222 p_var->p_entries = NULL;
224 /* Always initialize the variable, even if it is a list variable; this
225 * will lead to errors if the variable is not initialized, but it will
226 * not cause crashes in the variable handling. */
227 switch( i_type & VLC_VAR_CLASS )
230 p_var->ops = &bool_ops;
231 p_var->val.b_bool = false;
233 case VLC_VAR_INTEGER:
234 p_var->ops = &int_ops;
235 p_var->val.i_int = 0;
238 p_var->ops = &string_ops;
239 p_var->val.psz_string = NULL;
242 p_var->ops = &float_ops;
243 p_var->val.f_float = 0.0;
246 p_var->ops = &time_ops;
247 p_var->val.i_time = 0;
249 case VLC_VAR_ADDRESS:
250 p_var->ops = &addr_ops;
251 p_var->val.p_address = NULL;
254 p_var->ops = &mutex_ops;
255 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
256 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
259 p_var->ops = &list_ops;
260 p_var->val.p_list = &dummy_null_list;
263 p_var->ops = &void_ops;
267 if( i_type & VLC_VAR_DOINHERIT )
269 if( var_Inherit( p_this, psz_name, i_type, &p_var->val ) )
270 msg_Err( p_this, "cannot inherit value for %s", psz_name );
271 else if( i_type & VLC_VAR_HASCHOICE )
273 /* We must add the inherited value to our choice list */
274 p_var->i_default = 0;
276 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
278 INSERT_ELEM( p_var->choices_text.p_values,
279 p_var->choices_text.i_count, 0, p_var->val );
280 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
281 p_var->choices_text.p_values[0].psz_string = NULL;
285 vlc_object_internals_t *p_priv = vlc_internals( p_this );
288 vlc_mutex_lock( &p_priv->var_lock );
290 /* FIXME: if the variable already exists, we don't duplicate it. But we
291 * duplicate the lookups. It's not that serious, but if anyone finds some
292 * time to rework Insert() so that only one lookup has to be done, feel
294 i_new = Lookup( p_this, psz_name );
298 /* If the types differ, variable creation failed. */
299 if( (i_type & VLC_VAR_CLASS) != (p_priv->pp_vars[i_new]->i_type & VLC_VAR_CLASS) )
301 msg_Err( p_this, "Variable '%s' (0x%04x) already exist but with a different type (0x%04x)",
302 psz_name, p_priv->pp_vars[i_new]->i_type, i_type );
303 vlc_mutex_unlock( &p_priv->var_lock );
307 p_priv->pp_vars[i_new]->i_usage++;
308 p_priv->pp_vars[i_new]->i_type |= ( i_type & VLC_VAR_ISCOMMAND );
309 p_priv->pp_vars[i_new]->i_type |= ( i_type & VLC_VAR_HASCHOICE );
310 vlc_mutex_unlock( &p_priv->var_lock );
312 /* We did not need to create a new variable, free everything... */
317 i_new = Insert( p_priv->pp_vars, p_priv->i_vars, psz_name );
319 if( (p_priv->i_vars & 15) == 0 )
320 p_priv->pp_vars = xrealloc( p_priv->pp_vars,
321 (p_priv->i_vars+16) * sizeof(variable_t *) );
323 memmove( p_priv->pp_vars + i_new + 1,
324 p_priv->pp_vars + i_new,
325 (p_priv->i_vars - i_new) * sizeof(variable_t *) );
329 p_priv->pp_vars[i_new] = p_var;
330 vlc_mutex_unlock( &p_priv->var_lock );
336 * Destroy a vlc variable
338 * Look for the variable and destroy it if it is found. As in var_Create we
339 * do a call to memmove() but we have performance counterparts elsewhere.
341 * \param p_this The object that holds the variable
342 * \param psz_name The name of the variable
344 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
351 vlc_object_internals_t *p_priv = vlc_internals( p_this );
353 vlc_mutex_lock( &p_priv->var_lock );
355 i_var = GetUnused( p_this, psz_name );
358 vlc_mutex_unlock( &p_priv->var_lock );
362 p_var = p_priv->pp_vars[i_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 )
413 vlc_object_internals_t *p_priv = vlc_internals( p_this );
415 vlc_mutex_lock( &p_priv->var_lock );
417 i_var = Lookup( p_this, psz_name );
421 vlc_mutex_unlock( &p_priv->var_lock );
425 p_var = p_priv->pp_vars[i_var];
430 if( p_var->i_type & VLC_VAR_HASMIN )
432 p_var->ops->pf_free( &p_var->min );
434 p_var->i_type |= VLC_VAR_HASMIN;
436 p_var->ops->pf_dup( &p_var->min );
437 CheckValue( p_var, &p_var->val );
440 if( p_var->i_type & VLC_VAR_HASMIN )
446 if( p_var->i_type & VLC_VAR_HASMAX )
448 p_var->ops->pf_free( &p_var->max );
450 p_var->i_type |= VLC_VAR_HASMAX;
452 p_var->ops->pf_dup( &p_var->max );
453 CheckValue( p_var, &p_var->val );
456 if( p_var->i_type & VLC_VAR_HASMAX )
461 case VLC_VAR_SETSTEP:
462 if( p_var->i_type & VLC_VAR_HASSTEP )
464 p_var->ops->pf_free( &p_var->step );
466 p_var->i_type |= VLC_VAR_HASSTEP;
467 p_var->step = *p_val;
468 p_var->ops->pf_dup( &p_var->step );
469 CheckValue( p_var, &p_var->val );
471 case VLC_VAR_GETSTEP:
472 if( p_var->i_type & VLC_VAR_HASSTEP )
474 *p_val = p_var->step;
477 case VLC_VAR_ADDCHOICE:
478 i = p_var->choices.i_count;
480 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
482 INSERT_ELEM( p_var->choices_text.p_values,
483 p_var->choices_text.i_count, i, *p_val );
484 p_var->ops->pf_dup( &p_var->choices.p_values[i] );
485 p_var->choices_text.p_values[i].psz_string =
486 ( p_val2 && p_val2->psz_string ) ?
487 strdup( p_val2->psz_string ) : NULL;
489 CheckValue( p_var, &p_var->val );
491 case VLC_VAR_DELCHOICE:
492 for( i = 0 ; i < p_var->choices.i_count ; i++ )
494 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
500 if( i == p_var->choices.i_count )
503 vlc_mutex_unlock( &p_priv->var_lock );
507 if( p_var->i_default > i )
511 else if( p_var->i_default == i )
513 p_var->i_default = -1;
516 p_var->ops->pf_free( &p_var->choices.p_values[i] );
517 free( p_var->choices_text.p_values[i].psz_string );
518 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
519 REMOVE_ELEM( p_var->choices_text.p_values,
520 p_var->choices_text.i_count, i );
522 CheckValue( p_var, &p_var->val );
524 case VLC_VAR_CHOICESCOUNT:
525 p_val->i_int = p_var->choices.i_count;
527 case VLC_VAR_CLEARCHOICES:
528 for( i = 0 ; i < p_var->choices.i_count ; i++ )
530 p_var->ops->pf_free( &p_var->choices.p_values[i] );
532 for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
533 free( p_var->choices_text.p_values[i].psz_string );
535 if( p_var->choices.i_count ) free( p_var->choices.p_values );
536 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
538 p_var->choices.i_count = 0;
539 p_var->choices.p_values = NULL;
540 p_var->choices_text.i_count = 0;
541 p_var->choices_text.p_values = NULL;
542 p_var->i_default = -1;
544 case VLC_VAR_SETDEFAULT:
545 /* FIXME: the list is sorted, dude. Use something cleverer. */
546 for( i = 0 ; i < p_var->choices.i_count ; i++ )
548 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
554 if( i == p_var->choices.i_count )
560 p_var->i_default = i;
561 CheckValue( p_var, &p_var->val );
563 case VLC_VAR_SETVALUE:
564 /* Duplicate data if needed */
565 p_var->ops->pf_dup( p_val );
566 /* Backup needed stuff */
568 /* Check boundaries and list */
569 CheckValue( p_var, p_val );
570 /* Set the variable */
572 /* Free data if needed */
573 p_var->ops->pf_free( &oldval );
575 case VLC_VAR_GETCHOICES:
576 case VLC_VAR_GETLIST:
577 p_val->p_list = malloc( sizeof(vlc_list_t) );
578 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
579 if( p_var->choices.i_count )
581 p_val->p_list->p_values = malloc( p_var->choices.i_count
582 * sizeof(vlc_value_t) );
583 p_val->p_list->pi_types = malloc( p_var->choices.i_count
587 p_val2->p_list->p_values =
588 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
589 p_val2->p_list->pi_types =
590 malloc( p_var->choices.i_count * sizeof(int) );
593 p_val->p_list->i_count = p_var->choices.i_count;
594 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
595 for( i = 0 ; i < p_var->choices.i_count ; i++ )
597 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
598 p_val->p_list->pi_types[i] = p_var->i_type;
599 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
602 p_val2->p_list->p_values[i].psz_string =
603 p_var->choices_text.p_values[i].psz_string ?
604 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
605 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
609 case VLC_VAR_SETTEXT:
610 free( p_var->psz_text );
611 if( p_val && p_val->psz_string )
612 p_var->psz_text = strdup( p_val->psz_string );
614 p_var->psz_text = NULL;
616 case VLC_VAR_GETTEXT:
617 p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
620 case VLC_VAR_SETISCOMMAND:
621 p_var->i_type |= VLC_VAR_ISCOMMAND;
628 vlc_mutex_unlock( &p_priv->var_lock );
635 * Perform a Get and Set on a variable
637 * \param p_this: The object that hold the variable
638 * \param psz_name: the name of the variable
639 * \param i_action: the action to perform
640 * \param p_val: The action parameter
641 * \return vlc error codes
643 int __var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
653 vlc_object_internals_t *p_priv = vlc_internals( p_this );
655 vlc_mutex_lock( &p_priv->var_lock );
656 i_var = GetUnused( p_this, psz_name );
659 vlc_mutex_unlock( &p_priv->var_lock );
663 p_var = p_priv->pp_vars[i_var];
665 /* Duplicated data if needed */
666 //p_var->ops->pf_dup( &val );
668 /* Backup needed stuff */
671 /* depending of the action requiered */
674 case VLC_VAR_TOGGLE_BOOL:
675 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
676 p_var->val.b_bool = !p_var->val.b_bool;
678 case VLC_VAR_INTEGER_INCDEC:
679 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
680 p_var->val.i_int += val.i_int;
683 vlc_mutex_unlock( &p_priv->var_lock );
687 /* Check boundaries */
688 CheckValue( p_var, &p_var->val );
690 /* Deal with callbacks.*/
691 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
693 vlc_mutex_unlock( &p_priv->var_lock );
700 * Request a variable's type
702 * \return The variable type if it exists, or 0 if the
703 * variable could not be found.
706 int __var_Type( vlc_object_t *p_this, const char *psz_name )
712 vlc_object_internals_t *p_priv = vlc_internals( p_this );
714 vlc_mutex_lock( &p_priv->var_lock );
716 i_var = Lookup( p_this, psz_name );
720 vlc_mutex_unlock( &p_priv->var_lock );
724 i_type = p_priv->pp_vars[i_var]->i_type;
726 vlc_mutex_unlock( &p_priv->var_lock );
731 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
732 int expected_type, vlc_value_t val )
735 int i_ret = VLC_SUCCESS;
741 vlc_object_internals_t *p_priv = vlc_internals( p_this );
743 vlc_mutex_lock( &p_priv->var_lock );
745 i_var = GetUnused( p_this, psz_name );
748 vlc_mutex_unlock( &p_priv->var_lock );
752 p_var = p_priv->pp_vars[i_var];
753 assert( expected_type == 0 ||
754 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
756 /* Duplicate data if needed */
757 p_var->ops->pf_dup( &val );
759 /* Backup needed stuff */
762 /* Check boundaries and list */
763 CheckValue( p_var, &val );
765 /* Set the variable */
768 /* Deal with callbacks */
769 i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
771 /* Free data if needed */
772 p_var->ops->pf_free( &oldval );
774 vlc_mutex_unlock( &p_priv->var_lock );
781 * Set a variable's value
783 * \param p_this The object that hold the variable
784 * \param psz_name The name of the variable
785 * \param val the value to set
787 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
789 return var_SetChecked( p_this, psz_name, 0, val );
792 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
793 int expected_type, vlc_value_t *p_val )
797 vlc_object_internals_t *p_priv = vlc_internals( p_this );
798 int i_var, err = VLC_SUCCESS;
800 vlc_mutex_lock( &p_priv->var_lock );
802 i_var = Lookup( p_this, psz_name );
805 variable_t *p_var = p_priv->pp_vars[i_var];
807 assert( expected_type == 0 ||
808 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
810 /* Really get the variable */
814 /* Alert if the type is VLC_VAR_VOID */
815 if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
816 msg_Warn( p_this, "Calling var_GetVoid on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
819 /* Duplicate value if needed */
820 p_var->ops->pf_dup( p_val );
825 vlc_mutex_unlock( &p_priv->var_lock );
830 * Get a variable's value
832 * \param p_this The object that holds the variable
833 * \param psz_name The name of the variable
834 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
835 * after the function is finished
837 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
839 return var_GetChecked( p_this, psz_name, 0, p_val );
843 * Register a callback in a variable
845 * We store a function pointer that will be called upon variable
848 * \param p_this The object that holds the variable
849 * \param psz_name The name of the variable
850 * \param pf_callback The function pointer
851 * \param p_data A generic pointer that will be passed as the last
852 * argument to the callback function.
854 * \warning The callback function is run in the thread that calls var_Set on
855 * the variable. Use proper locking. This thread may not have much
856 * time to spare, so keep callback functions short.
858 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
859 vlc_callback_t pf_callback, void *p_data )
863 callback_entry_t entry;
867 vlc_object_internals_t *p_priv = vlc_internals( p_this );
869 entry.pf_callback = pf_callback;
870 entry.p_data = p_data;
872 vlc_mutex_lock( &p_priv->var_lock );
874 i_var = GetUnused( p_this, psz_name );
878 msg_Warn( p_this, "Failed to add a callback to the non-existing "
879 "variable '%s'", psz_name );
881 vlc_mutex_unlock( &p_priv->var_lock );
885 p_var = p_priv->pp_vars[i_var];
887 INSERT_ELEM( p_var->p_entries,
892 vlc_mutex_unlock( &p_priv->var_lock );
898 * Remove a callback from a variable
900 * pf_callback and p_data have to be given again, because different objects
901 * might have registered the same callback function.
903 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
904 vlc_callback_t pf_callback, void *p_data )
909 bool b_found_similar = false;
914 vlc_object_internals_t *p_priv = vlc_internals( p_this );
916 vlc_mutex_lock( &p_priv->var_lock );
918 i_var = GetUnused( p_this, psz_name );
921 vlc_mutex_unlock( &p_priv->var_lock );
925 p_var = p_priv->pp_vars[i_var];
927 for( i_entry = p_var->i_entries ; i_entry-- ; )
929 if( p_var->p_entries[i_entry].pf_callback == pf_callback
930 && p_var->p_entries[i_entry].p_data == p_data )
935 else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
936 b_found_similar = true;
943 if( b_found_similar )
944 fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
945 "function but not the same data.", psz_name );
948 vlc_mutex_unlock( &p_priv->var_lock );
952 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
954 vlc_mutex_unlock( &p_priv->var_lock );
960 * Trigger callback on a variable
962 * \param p_this The object that hold the variable
963 * \param psz_name The name of the variable
965 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
973 vlc_object_internals_t *p_priv = vlc_internals( p_this );
975 vlc_mutex_lock( &p_priv->var_lock );
977 i_var = GetUnused( p_this, psz_name );
980 vlc_mutex_unlock( &p_priv->var_lock );
984 p_var = p_priv->pp_vars[i_var];
986 /* Deal with callbacks. Tell we're in a callback, release the lock,
987 * call stored functions, retake the lock. */
988 i_ret = TriggerCallback( p_this, p_var, psz_name, p_var->val );
990 vlc_mutex_unlock( &p_priv->var_lock );
994 /** Parse a stringified option
995 * This function parse a string option and create the associated object
997 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
998 * option name and bar is the value of the option.
999 * \param p_obj the object in which the variable must be created
1000 * \param psz_option the option to parse
1001 * \param trusted whether the option is set by a trusted input or not
1004 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1007 char *psz_name, *psz_value;
1009 bool b_isno = false;
1012 val.psz_string = NULL;
1014 /* It's too much of a hassle to remove the ':' when we parse
1015 * the cmd line :) */
1016 if( psz_option[0] == ':' )
1019 if( !psz_option[0] )
1022 psz_name = strdup( psz_option );
1023 if( psz_name == NULL )
1026 psz_value = strchr( psz_name, '=' );
1027 if( psz_value != NULL )
1028 *psz_value++ = '\0';
1030 /* FIXME: :programs should be handled generically */
1031 if( !strcmp( psz_name, "programs" ) )
1032 i_type = VLC_VAR_LIST;
1034 i_type = config_GetType( p_obj, psz_name );
1036 if( !i_type && !psz_value )
1038 /* check for "no-foo" or "nofoo" */
1039 if( !strncmp( psz_name, "no-", 3 ) )
1041 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1043 else if( !strncmp( psz_name, "no", 2 ) )
1045 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1047 else goto cleanup; /* Option doesn't exist */
1050 i_type = config_GetType( p_obj, psz_name );
1052 if( !i_type ) goto cleanup; /* Option doesn't exist */
1054 if( ( i_type != VLC_VAR_BOOL ) &&
1055 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1057 /* check if option is unsafe */
1060 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1061 if( !p_config || !p_config->b_safe )
1063 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1064 "security reasons", psz_name );
1070 /* Create the variable in the input object.
1071 * Children of the input object will be able to retreive this value
1072 * thanks to the inheritance property of the object variables. */
1073 __var_Create( p_obj, psz_name, i_type );
1078 val.b_bool = !b_isno;
1081 case VLC_VAR_INTEGER:
1082 val.i_int = strtol( psz_value, NULL, 0 );
1086 val.f_float = us_atof( psz_value );
1089 case VLC_VAR_STRING:
1090 case VLC_VAR_MODULE:
1092 case VLC_VAR_DIRECTORY:
1093 val.psz_string = psz_value;
1098 char *psz_orig, *psz_var;
1099 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1100 val.p_list = p_list;
1101 p_list->i_count = 0;
1103 psz_var = psz_orig = strdup(psz_value);
1104 while( psz_var && *psz_var )
1106 char *psz_item = psz_var;
1108 while( *psz_var && *psz_var != ',' ) psz_var++;
1109 if( *psz_var == ',' )
1114 val2.i_int = strtol( psz_item, NULL, 0 );
1115 INSERT_ELEM( p_list->p_values, p_list->i_count,
1116 p_list->i_count, val2 );
1117 /* p_list->i_count is incremented twice by INSERT_ELEM */
1119 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1120 p_list->i_count, VLC_VAR_INTEGER );
1130 __var_Set( p_obj, psz_name, val );
1132 /* If that's a list, remove all elements allocated */
1133 if( i_type == VLC_VAR_LIST )
1141 /* Following functions are local */
1143 /*****************************************************************************
1144 * GetUnused: find an unused (not in callback) variable from its name
1145 *****************************************************************************/
1146 static int GetUnused( vlc_object_t *p_this, const char *psz_name )
1150 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1156 i_var = Lookup( p_this, psz_name );
1162 if( ! p_priv->pp_vars[i_var]->b_incallback )
1167 mutex_cleanup_push( &p_priv->var_lock );
1168 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1173 /*****************************************************************************
1174 * HashString: our cool hash function
1175 *****************************************************************************
1176 * This function is not intended to be crypto-secure, we only want it to be
1177 * fast and not suck too much. This one is pretty fast and did 0 collisions
1178 * in wenglish's dictionary.
1179 *****************************************************************************/
1180 static uint32_t HashString( const char *psz_string )
1182 uint32_t i_hash = 0;
1184 while( *psz_string )
1186 i_hash += *psz_string++;
1187 i_hash += i_hash << 10;
1188 i_hash ^= i_hash >> 8;
1194 /*****************************************************************************
1195 * Insert: find an empty slot to insert a new variable
1196 *****************************************************************************
1197 * We use a recursive inner function indexed on the hash. This function does
1198 * nothing in the rare cases where a collision may occur, see Lookup()
1199 * to see how we handle them.
1200 * XXX: does this really need to be written recursively?
1201 *****************************************************************************/
1202 static int Insert( variable_t **pp_vars, int i_count, const char *psz_name )
1209 return InsertInner( pp_vars, i_count, HashString( psz_name ) );
1212 static int InsertInner( variable_t **pp_vars, int i_count, uint32_t i_hash )
1216 if( i_hash <= pp_vars[0]->i_hash )
1221 if( i_hash >= pp_vars[i_count - 1]->i_hash )
1226 i_middle = i_count / 2;
1228 /* We know that 0 < i_middle */
1229 if( i_hash < pp_vars[i_middle]->i_hash )
1231 return InsertInner( pp_vars, i_middle, i_hash );
1234 /* We know that i_middle + 1 < i_count */
1235 if( i_hash > pp_vars[i_middle + 1]->i_hash )
1237 return i_middle + 1 + InsertInner( pp_vars + i_middle + 1,
1238 i_count - i_middle - 1,
1242 return i_middle + 1;
1245 static int u32cmp( const void *key, const void *data )
1247 const variable_t *const *pp_var = data;
1248 uint32_t hash = *(const uint32_t *)key ;
1250 if( hash > (*pp_var)->i_hash )
1252 if( hash < (*pp_var)->i_hash )
1257 /*****************************************************************************
1258 * Lookup: find an existing variable given its name
1259 *****************************************************************************
1260 * We use a recursive inner function indexed on the hash. Care is taken of
1261 * possible hash collisions.
1262 *****************************************************************************/
1263 static int Lookup( vlc_object_t *obj, const char *psz_name )
1265 vlc_object_internals_t *priv = vlc_internals( obj );
1266 variable_t **pp_vars = priv->pp_vars;
1267 size_t i_vars = priv->i_vars;
1268 variable_t **pp_var;
1269 uint32_t i_hash = HashString( psz_name );
1271 pp_var = bsearch( &i_hash, pp_vars, i_vars, sizeof( *pp_var ), u32cmp );
1273 /* Hash not found */
1274 if( pp_var == NULL )
1277 assert( i_vars > 0 );
1279 /* Find the first entry with the right hash */
1280 while( (pp_var > pp_vars) && (i_hash == pp_var[-1]->i_hash) )
1283 assert( (*pp_var)->i_hash == i_hash );
1285 /* Hash collision should be very unlikely, but we cannot guarantee
1286 * it will never happen. So we do an exhaustive search amongst all
1287 * entries with the same hash. Typically, there is only one anyway. */
1288 for( variable_t *const *p_end = pp_vars + i_vars;
1289 (pp_var < p_end) && (i_hash == (*pp_var)->i_hash);
1292 if( !strcmp( psz_name, (*pp_var)->psz_name ) )
1293 return pp_var - pp_vars;
1296 /* Hash found, but entry not found */
1300 /*****************************************************************************
1301 * CheckValue: check that a value is valid wrt. a variable
1302 *****************************************************************************
1303 * This function checks p_val's value against p_var's limitations such as
1304 * minimal and maximal value, step, in-list position, and modifies p_val if
1306 ****************************************************************************/
1307 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1309 /* Check that our variable is in the list */
1310 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1314 /* This list is not sorted so go throug it (this is a small list) */
1315 for( i = p_var->choices.i_count ; i-- ; )
1317 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1323 /* If not found, change it to anything vaguely valid */
1326 /* Free the old variable, get the new one, dup it */
1327 p_var->ops->pf_free( p_val );
1328 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1329 ? p_var->i_default : 0 ];
1330 p_var->ops->pf_dup( p_val );
1334 /* Check that our variable is within the bounds */
1335 switch( p_var->i_type & VLC_VAR_TYPE )
1337 case VLC_VAR_INTEGER:
1338 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1339 && (p_val->i_int % p_var->step.i_int) )
1341 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1342 / p_var->step.i_int * p_var->step.i_int;
1344 if( p_var->i_type & VLC_VAR_HASMIN
1345 && p_val->i_int < p_var->min.i_int )
1347 p_val->i_int = p_var->min.i_int;
1349 if( p_var->i_type & VLC_VAR_HASMAX
1350 && p_val->i_int > p_var->max.i_int )
1352 p_val->i_int = p_var->max.i_int;
1356 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1358 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1359 p_val->f_float / p_var->step.f_float );
1360 if( p_val->f_float != f_round )
1362 p_val->f_float = f_round;
1365 if( p_var->i_type & VLC_VAR_HASMIN
1366 && p_val->f_float < p_var->min.f_float )
1368 p_val->f_float = p_var->min.f_float;
1370 if( p_var->i_type & VLC_VAR_HASMAX
1371 && p_val->f_float > p_var->max.f_float )
1373 p_val->f_float = p_var->max.f_float;
1383 * Finds the value of a variable. If the specified object does not hold a
1384 * variable with the specified name, try the parent object, and iterate until
1385 * the top of the tree. If no match is found, the value is read from the
1388 int var_Inherit( vlc_object_t *p_this, const char *psz_name, int i_type,
1389 vlc_value_t *p_val )
1391 i_type &= VLC_VAR_CLASS;
1392 for( vlc_object_t *obj = p_this; obj != NULL; obj = obj->p_parent )
1393 if( var_GetChecked( obj, psz_name, i_type, p_val ) == VLC_SUCCESS )
1396 /* else take value from config */
1397 switch( i_type & VLC_VAR_CLASS )
1399 case VLC_VAR_STRING:
1400 p_val->psz_string = config_GetPsz( p_this, psz_name );
1401 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1404 p_val->f_float = config_GetFloat( p_this, psz_name );
1406 case VLC_VAR_INTEGER:
1407 p_val->i_int = config_GetInt( p_this, psz_name );
1410 p_val->b_bool = config_GetInt( p_this, psz_name );
1414 char *psz_orig, *psz_var;
1415 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1416 p_val->p_list = p_list;
1417 p_list->i_count = 0;
1419 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1420 while( psz_var && *psz_var )
1422 char *psz_item = psz_var;
1424 while( *psz_var && *psz_var != ',' ) psz_var++;
1425 if( *psz_var == ',' )
1430 val.i_int = strtol( psz_item, NULL, 0 );
1431 INSERT_ELEM( p_list->p_values, p_list->i_count,
1432 p_list->i_count, val );
1433 /* p_list->i_count is incremented twice by INSERT_ELEM */
1435 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1436 p_list->i_count, VLC_VAR_INTEGER );
1442 msg_Warn( p_this, "Could not inherit value for var %s "
1443 "from config. Invalid Type", psz_name );
1446 /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1451 /**********************************************************************
1452 * Trigger the callbacks.
1453 * Tell we're in a callback, release the lock, call stored functions,
1455 **********************************************************************/
1456 static int TriggerCallback( vlc_object_t *p_this, variable_t *p_var,
1457 const char *psz_name, vlc_value_t oldval )
1461 int i_entries = p_var->i_entries;
1462 if( i_entries == 0 )
1465 callback_entry_t *p_entries = p_var->p_entries;
1466 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1468 p_var->b_incallback = true;
1469 vlc_mutex_unlock( &p_priv->var_lock );
1471 /* The real calls */
1472 for( ; i_entries-- ; )
1474 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, p_var->val,
1475 p_entries[i_entries].p_data );
1478 vlc_mutex_lock( &p_priv->var_lock );
1479 p_var->b_incallback = false;
1480 vlc_cond_broadcast( &p_priv->var_wait );
1486 /**********************************************************************
1487 * Execute a var command on an object identified by its name
1488 **********************************************************************/
1489 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1490 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1492 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1493 psz_name, FIND_CHILD );
1499 *psz_msg = strdup( "Unknown destination object." );
1503 i_type = var_Type( p_obj, psz_cmd );
1504 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1506 vlc_object_release( p_obj );
1508 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1509 return VLC_EGENERIC;
1512 i_type &= VLC_VAR_CLASS;
1515 case VLC_VAR_INTEGER:
1516 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1519 i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
1521 case VLC_VAR_STRING:
1522 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1525 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1528 i_ret = VLC_EGENERIC;
1532 vlc_object_release( p_obj );
1536 if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1537 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1546 * Free a list and the associated strings
1547 * @param p_val: the list variable
1548 * @param p_val2: the variable associated or NULL
1550 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1553 if( p_val2 && p_val2->p_list )
1555 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1556 free( p_val2->p_list->p_values[i].psz_string );
1557 if( p_val2->p_list->i_count )
1559 free( p_val2->p_list->p_values );
1560 free( p_val2->p_list->pi_types );
1562 free( p_val2->p_list );