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 ( variable_t *, size_t, const char * );
161 static void CheckValue ( variable_t *, vlc_value_t * );
163 static int InheritValue( vlc_object_t *, const char *, vlc_value_t *,
165 static int TriggerCallback( vlc_object_t *, variable_t **, const char *,
169 * Initialize a vlc variable
171 * We hash the given string and insert it into the sorted list. The insertion
172 * may require slow memory copies, but think about what we gain in the log(n)
173 * lookup phase when setting/getting the variable value!
175 * \param p_this The object in which to create the variable
176 * \param psz_name The name of the variable
177 * \param i_type The variables type. Must be one of \ref var_type combined with
178 * zero or more \ref var_flags
180 int __var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
184 static vlc_list_t dummy_null_list = {0, NULL, NULL};
188 vlc_object_internals_t *p_priv = vlc_internals( p_this );
190 vlc_mutex_lock( &p_priv->var_lock );
192 /* FIXME: if the variable already exists, we don't duplicate it. But we
193 * duplicate the lookups. It's not that serious, but if anyone finds some
194 * time to rework Insert() so that only one lookup has to be done, feel
196 i_new = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
200 /* If the types differ, variable creation failed. */
201 if( (i_type & VLC_VAR_CLASS) != (p_priv->p_vars[i_new].i_type & VLC_VAR_CLASS) )
203 msg_Err( p_this, "Variable '%s' (0x%04x) already exist but with a different type (0x%04x)",
204 psz_name, p_priv->p_vars[i_new].i_type, i_type );
205 vlc_mutex_unlock( &p_priv->var_lock );
209 p_priv->p_vars[i_new].i_usage++;
210 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_ISCOMMAND );
211 p_priv->p_vars[i_new].i_type |= ( i_type & VLC_VAR_HASCHOICE );
212 vlc_mutex_unlock( &p_priv->var_lock );
216 i_new = Insert( p_priv->p_vars, p_priv->i_vars, psz_name );
218 if( (p_priv->i_vars & 15) == 15 )
220 p_priv->p_vars = xrealloc( p_priv->p_vars,
221 (p_priv->i_vars+17) * sizeof(variable_t) );
224 memmove( p_priv->p_vars + i_new + 1,
225 p_priv->p_vars + i_new,
226 (p_priv->i_vars - i_new) * sizeof(variable_t) );
230 p_var = &p_priv->p_vars[i_new];
231 memset( p_var, 0, sizeof(*p_var) );
233 p_var->i_hash = HashString( psz_name );
234 p_var->psz_name = strdup( psz_name );
235 p_var->psz_text = NULL;
237 p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
241 p_var->i_default = -1;
242 p_var->choices.i_count = 0;
243 p_var->choices.p_values = NULL;
244 p_var->choices_text.i_count = 0;
245 p_var->choices_text.p_values = NULL;
247 p_var->b_incallback = false;
248 p_var->i_entries = 0;
249 p_var->p_entries = NULL;
251 /* Always initialize the variable, even if it is a list variable; this
252 * will lead to errors if the variable is not initialized, but it will
253 * not cause crashes in the variable handling. */
254 switch( i_type & VLC_VAR_CLASS )
257 p_var->ops = &bool_ops;
258 p_var->val.b_bool = false;
260 case VLC_VAR_INTEGER:
261 p_var->ops = &int_ops;
262 p_var->val.i_int = 0;
265 p_var->ops = &string_ops;
266 p_var->val.psz_string = NULL;
269 p_var->ops = &float_ops;
270 p_var->val.f_float = 0.0;
273 p_var->ops = &time_ops;
274 p_var->val.i_time = 0;
276 case VLC_VAR_ADDRESS:
277 p_var->ops = &addr_ops;
278 p_var->val.p_address = NULL;
281 p_var->ops = &mutex_ops;
282 p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
283 vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
286 p_var->ops = &list_ops;
287 p_var->val.p_list = &dummy_null_list;
290 p_var->ops = &void_ops;
294 /* Duplicate the default data we stored. */
295 p_var->ops->pf_dup( &p_var->val );
297 if( i_type & VLC_VAR_DOINHERIT )
301 if( InheritValue( p_this, psz_name, &val, p_var->i_type )
304 /* Free data if needed */
305 p_var->ops->pf_free( &p_var->val );
306 /* Set the variable */
309 if( i_type & VLC_VAR_HASCHOICE )
311 /* We must add the inherited value to our choice list */
312 p_var->i_default = 0;
314 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
316 INSERT_ELEM( p_var->choices_text.p_values,
317 p_var->choices_text.i_count, 0, val );
318 p_var->ops->pf_dup( &p_var->choices.p_values[0] );
319 p_var->choices_text.p_values[0].psz_string = NULL;
324 vlc_mutex_unlock( &p_priv->var_lock );
330 * Destroy a vlc variable
332 * Look for the variable and destroy it if it is found. As in var_Create we
333 * do a call to memmove() but we have performance counterparts elsewhere.
335 * \param p_this The object that holds the variable
336 * \param psz_name The name of the variable
338 int __var_Destroy( vlc_object_t *p_this, const char *psz_name )
345 vlc_object_internals_t *p_priv = vlc_internals( p_this );
347 vlc_mutex_lock( &p_priv->var_lock );
349 i_var = GetUnused( p_this, psz_name );
352 vlc_mutex_unlock( &p_priv->var_lock );
356 p_var = &p_priv->p_vars[i_var];
358 if( p_var->i_usage > 1 )
361 vlc_mutex_unlock( &p_priv->var_lock );
365 /* Free value if needed */
366 p_var->ops->pf_free( &p_var->val );
368 /* Free choice list if needed */
369 if( p_var->choices.i_count )
371 for( i = 0 ; i < p_var->choices.i_count ; i++ )
373 p_var->ops->pf_free( &p_var->choices.p_values[i] );
374 free( p_var->choices_text.p_values[i].psz_string );
376 free( p_var->choices.p_values );
377 free( p_var->choices_text.p_values );
380 /* Free callbacks if needed */
381 free( p_var->p_entries );
383 free( p_var->psz_name );
384 free( p_var->psz_text );
386 memmove( p_priv->p_vars + i_var,
387 p_priv->p_vars + i_var + 1,
388 (p_priv->i_vars - i_var - 1) * sizeof(variable_t) );
390 if( (p_priv->i_vars & 15) == 0 )
392 variable_t *p_vars = realloc( p_priv->p_vars,
393 (p_priv->i_vars) * sizeof( variable_t ) );
395 p_priv->p_vars = p_vars;
400 vlc_mutex_unlock( &p_priv->var_lock );
406 * Perform an action on a variable
408 * \param p_this The object that holds the variable
409 * \param psz_name The name of the variable
410 * \param i_action The action to perform. Must be one of \ref var_action
411 * \param p_val First action parameter
412 * \param p_val2 Second action parameter
414 int __var_Change( vlc_object_t *p_this, const char *psz_name,
415 int i_action, vlc_value_t *p_val, vlc_value_t *p_val2 )
423 vlc_object_internals_t *p_priv = vlc_internals( p_this );
425 vlc_mutex_lock( &p_priv->var_lock );
427 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
431 vlc_mutex_unlock( &p_priv->var_lock );
435 p_var = &p_priv->p_vars[i_var];
440 if( p_var->i_type & VLC_VAR_HASMIN )
442 p_var->ops->pf_free( &p_var->min );
444 p_var->i_type |= VLC_VAR_HASMIN;
446 p_var->ops->pf_dup( &p_var->min );
447 CheckValue( p_var, &p_var->val );
450 if( p_var->i_type & VLC_VAR_HASMIN )
456 if( p_var->i_type & VLC_VAR_HASMAX )
458 p_var->ops->pf_free( &p_var->max );
460 p_var->i_type |= VLC_VAR_HASMAX;
462 p_var->ops->pf_dup( &p_var->max );
463 CheckValue( p_var, &p_var->val );
466 if( p_var->i_type & VLC_VAR_HASMAX )
471 case VLC_VAR_SETSTEP:
472 if( p_var->i_type & VLC_VAR_HASSTEP )
474 p_var->ops->pf_free( &p_var->step );
476 p_var->i_type |= VLC_VAR_HASSTEP;
477 p_var->step = *p_val;
478 p_var->ops->pf_dup( &p_var->step );
479 CheckValue( p_var, &p_var->val );
481 case VLC_VAR_GETSTEP:
482 if( p_var->i_type & VLC_VAR_HASSTEP )
484 *p_val = p_var->step;
487 case VLC_VAR_ADDCHOICE:
488 i = p_var->choices.i_count;
490 INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
492 INSERT_ELEM( p_var->choices_text.p_values,
493 p_var->choices_text.i_count, i, *p_val );
494 p_var->ops->pf_dup( &p_var->choices.p_values[i] );
495 p_var->choices_text.p_values[i].psz_string =
496 ( p_val2 && p_val2->psz_string ) ?
497 strdup( p_val2->psz_string ) : NULL;
499 CheckValue( p_var, &p_var->val );
501 case VLC_VAR_DELCHOICE:
502 for( i = 0 ; i < p_var->choices.i_count ; i++ )
504 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
510 if( i == p_var->choices.i_count )
513 vlc_mutex_unlock( &p_priv->var_lock );
517 if( p_var->i_default > i )
521 else if( p_var->i_default == i )
523 p_var->i_default = -1;
526 p_var->ops->pf_free( &p_var->choices.p_values[i] );
527 free( p_var->choices_text.p_values[i].psz_string );
528 REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
529 REMOVE_ELEM( p_var->choices_text.p_values,
530 p_var->choices_text.i_count, i );
532 CheckValue( p_var, &p_var->val );
534 case VLC_VAR_CHOICESCOUNT:
535 p_val->i_int = p_var->choices.i_count;
537 case VLC_VAR_CLEARCHOICES:
538 for( i = 0 ; i < p_var->choices.i_count ; i++ )
540 p_var->ops->pf_free( &p_var->choices.p_values[i] );
542 for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
543 free( p_var->choices_text.p_values[i].psz_string );
545 if( p_var->choices.i_count ) free( p_var->choices.p_values );
546 if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
548 p_var->choices.i_count = 0;
549 p_var->choices.p_values = NULL;
550 p_var->choices_text.i_count = 0;
551 p_var->choices_text.p_values = NULL;
552 p_var->i_default = -1;
554 case VLC_VAR_SETDEFAULT:
555 /* FIXME: the list is sorted, dude. Use something cleverer. */
556 for( i = 0 ; i < p_var->choices.i_count ; i++ )
558 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
564 if( i == p_var->choices.i_count )
570 p_var->i_default = i;
571 CheckValue( p_var, &p_var->val );
573 case VLC_VAR_SETVALUE:
574 /* Duplicate data if needed */
575 p_var->ops->pf_dup( p_val );
576 /* Backup needed stuff */
578 /* Check boundaries and list */
579 CheckValue( p_var, p_val );
580 /* Set the variable */
582 /* Free data if needed */
583 p_var->ops->pf_free( &oldval );
585 case VLC_VAR_GETCHOICES:
586 case VLC_VAR_GETLIST:
587 p_val->p_list = malloc( sizeof(vlc_list_t) );
588 if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
589 if( p_var->choices.i_count )
591 p_val->p_list->p_values = malloc( p_var->choices.i_count
592 * sizeof(vlc_value_t) );
593 p_val->p_list->pi_types = malloc( p_var->choices.i_count
597 p_val2->p_list->p_values =
598 malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
599 p_val2->p_list->pi_types =
600 malloc( p_var->choices.i_count * sizeof(int) );
603 p_val->p_list->i_count = p_var->choices.i_count;
604 if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
605 for( i = 0 ; i < p_var->choices.i_count ; i++ )
607 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
608 p_val->p_list->pi_types[i] = p_var->i_type;
609 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
612 p_val2->p_list->p_values[i].psz_string =
613 p_var->choices_text.p_values[i].psz_string ?
614 strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
615 p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
619 case VLC_VAR_SETTEXT:
620 free( p_var->psz_text );
621 if( p_val && p_val->psz_string )
622 p_var->psz_text = strdup( p_val->psz_string );
624 p_var->psz_text = NULL;
626 case VLC_VAR_GETTEXT:
627 p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
630 case VLC_VAR_INHERITVALUE:
634 if( InheritValue( p_this,
635 p_val2 ? p_val2->psz_string : psz_name,
636 &val, p_var->i_type )
639 /* Duplicate already done */
641 /* Backup needed stuff */
643 /* Check boundaries and list */
644 CheckValue( p_var, &val );
645 /* Set the variable */
647 /* Free data if needed */
648 p_var->ops->pf_free( &oldval );
654 p_var->ops->pf_dup( p_val );
659 case VLC_VAR_SETISCOMMAND:
660 p_var->i_type |= VLC_VAR_ISCOMMAND;
667 vlc_mutex_unlock( &p_priv->var_lock );
674 * Perform a Get and Set on a variable
676 * \param p_this: The object that hold the variable
677 * \param psz_name: the name of the variable
678 * \param i_action: the action to perform
679 * \param p_val: The action parameter
680 * \return vlc error codes
682 int __var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
686 int i_ret = VLC_SUCCESS;
692 vlc_object_internals_t *p_priv = vlc_internals( p_this );
694 vlc_mutex_lock( &p_priv->var_lock );
695 i_var = GetUnused( p_this, psz_name );
698 vlc_mutex_unlock( &p_priv->var_lock );
702 p_var = &p_priv->p_vars[i_var];
704 /* Duplicated data if needed */
705 //p_var->ops->pf_dup( &val );
707 /* Backup needed stuff */
710 /* depending of the action requiered */
713 case VLC_VAR_TOGGLE_BOOL:
714 assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
715 p_var->val.b_bool = !p_var->val.b_bool;
717 case VLC_VAR_INTEGER_INCDEC:
718 assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
719 p_var->val.i_int += val.i_int;
722 vlc_mutex_unlock( &p_priv->var_lock );
726 /* Check boundaries */
727 CheckValue( p_var, &p_var->val );
729 /* Deal with callbacks.*/
730 if( p_var->i_entries )
731 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
733 vlc_mutex_unlock( &p_priv->var_lock );
740 * Request a variable's type
742 * \return The variable type if it exists, or 0 if the
743 * variable could not be found.
746 int __var_Type( vlc_object_t *p_this, const char *psz_name )
752 vlc_object_internals_t *p_priv = vlc_internals( p_this );
754 vlc_mutex_lock( &p_priv->var_lock );
756 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
760 vlc_mutex_unlock( &p_priv->var_lock );
764 i_type = p_priv->p_vars[i_var].i_type;
766 vlc_mutex_unlock( &p_priv->var_lock );
771 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
772 int expected_type, vlc_value_t val )
775 int i_ret = VLC_SUCCESS;
781 vlc_object_internals_t *p_priv = vlc_internals( p_this );
783 vlc_mutex_lock( &p_priv->var_lock );
785 i_var = GetUnused( p_this, psz_name );
788 vlc_mutex_unlock( &p_priv->var_lock );
792 p_var = &p_priv->p_vars[i_var];
793 assert( expected_type == 0 ||
794 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
796 /* Duplicate data if needed */
797 p_var->ops->pf_dup( &val );
799 /* Backup needed stuff */
802 /* Check boundaries and list */
803 CheckValue( p_var, &val );
805 /* Set the variable */
808 /* Deal with callbacks */
809 if( p_var->i_entries )
810 i_ret = TriggerCallback( p_this, &p_var, psz_name, oldval );
812 /* Free data if needed */
813 p_var->ops->pf_free( &oldval );
815 vlc_mutex_unlock( &p_priv->var_lock );
822 * Set a variable's value
824 * \param p_this The object that hold the variable
825 * \param psz_name The name of the variable
826 * \param val the value to set
828 int __var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
830 return var_SetChecked( p_this, psz_name, 0, val );
833 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
834 int expected_type, vlc_value_t *p_val )
838 vlc_object_internals_t *p_priv = vlc_internals( p_this );
839 int i_var, err = VLC_SUCCESS;
841 vlc_mutex_lock( &p_priv->var_lock );
843 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
846 variable_t *p_var = &p_priv->p_vars[i_var];
848 assert( expected_type == 0 ||
849 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
851 /* Really get the variable */
855 /* Alert if the type is VLC_VAR_VOID */
856 if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
857 msg_Warn( p_this, "Calling var_GetVoid on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
860 /* Duplicate value if needed */
861 p_var->ops->pf_dup( p_val );
866 vlc_mutex_unlock( &p_priv->var_lock );
871 * Get a variable's value
873 * \param p_this The object that holds the variable
874 * \param psz_name The name of the variable
875 * \param p_val Pointer to a vlc_value_t that will hold the variable's value
876 * after the function is finished
878 int __var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
880 return var_GetChecked( p_this, psz_name, 0, p_val );
884 * Register a callback in a variable
886 * We store a function pointer that will be called upon variable
889 * \param p_this The object that holds the variable
890 * \param psz_name The name of the variable
891 * \param pf_callback The function pointer
892 * \param p_data A generic pointer that will be passed as the last
893 * argument to the callback function.
895 * \warning The callback function is run in the thread that calls var_Set on
896 * the variable. Use proper locking. This thread may not have much
897 * time to spare, so keep callback functions short.
899 int __var_AddCallback( vlc_object_t *p_this, const char *psz_name,
900 vlc_callback_t pf_callback, void *p_data )
904 callback_entry_t entry;
908 vlc_object_internals_t *p_priv = vlc_internals( p_this );
910 entry.pf_callback = pf_callback;
911 entry.p_data = p_data;
913 vlc_mutex_lock( &p_priv->var_lock );
915 i_var = GetUnused( p_this, psz_name );
919 msg_Warn( p_this, "Failed to add a callback to the non-existing "
920 "variable '%s'", psz_name );
922 vlc_mutex_unlock( &p_priv->var_lock );
926 p_var = &p_priv->p_vars[i_var];
928 INSERT_ELEM( p_var->p_entries,
933 vlc_mutex_unlock( &p_priv->var_lock );
939 * Remove a callback from a variable
941 * pf_callback and p_data have to be given again, because different objects
942 * might have registered the same callback function.
944 int __var_DelCallback( vlc_object_t *p_this, const char *psz_name,
945 vlc_callback_t pf_callback, void *p_data )
950 bool b_found_similar = false;
955 vlc_object_internals_t *p_priv = vlc_internals( p_this );
957 vlc_mutex_lock( &p_priv->var_lock );
959 i_var = GetUnused( p_this, psz_name );
962 vlc_mutex_unlock( &p_priv->var_lock );
966 p_var = &p_priv->p_vars[i_var];
968 for( i_entry = p_var->i_entries ; i_entry-- ; )
970 if( p_var->p_entries[i_entry].pf_callback == pf_callback
971 && p_var->p_entries[i_entry].p_data == p_data )
976 else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
977 b_found_similar = true;
984 if( b_found_similar )
985 fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
986 "function but not the same data.", psz_name );
989 vlc_mutex_unlock( &p_priv->var_lock );
993 REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
995 vlc_mutex_unlock( &p_priv->var_lock );
1001 * Trigger callback on a variable
1003 * \param p_this The object that hold the variable
1004 * \param psz_name The name of the variable
1006 int __var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
1009 int i_ret = VLC_SUCCESS;
1014 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1016 vlc_mutex_lock( &p_priv->var_lock );
1018 i_var = GetUnused( p_this, psz_name );
1021 vlc_mutex_unlock( &p_priv->var_lock );
1025 p_var = &p_priv->p_vars[i_var];
1027 /* Deal with callbacks. Tell we're in a callback, release the lock,
1028 * call stored functions, retake the lock. */
1029 if( p_var->i_entries )
1030 i_ret = TriggerCallback( p_this, &p_var, psz_name, p_var->val );
1032 vlc_mutex_unlock( &p_priv->var_lock );
1036 /** Parse a stringified option
1037 * This function parse a string option and create the associated object
1039 * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1040 * option name and bar is the value of the option.
1041 * \param p_obj the object in which the variable must be created
1042 * \param psz_option the option to parse
1043 * \param trusted whether the option is set by a trusted input or not
1046 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1049 char *psz_name, *psz_value;
1051 bool b_isno = false;
1054 val.psz_string = NULL;
1056 /* It's too much of a hassle to remove the ':' when we parse
1057 * the cmd line :) */
1058 if( psz_option[0] == ':' )
1061 if( !psz_option[0] )
1064 psz_name = strdup( psz_option );
1065 if( psz_name == NULL )
1068 psz_value = strchr( psz_name, '=' );
1069 if( psz_value != NULL )
1070 *psz_value++ = '\0';
1072 /* FIXME: :programs should be handled generically */
1073 if( !strcmp( psz_name, "programs" ) )
1074 i_type = VLC_VAR_LIST;
1076 i_type = config_GetType( p_obj, psz_name );
1078 if( !i_type && !psz_value )
1080 /* check for "no-foo" or "nofoo" */
1081 if( !strncmp( psz_name, "no-", 3 ) )
1083 memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1085 else if( !strncmp( psz_name, "no", 2 ) )
1087 memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1089 else goto cleanup; /* Option doesn't exist */
1092 i_type = config_GetType( p_obj, psz_name );
1094 if( !i_type ) goto cleanup; /* Option doesn't exist */
1096 if( ( i_type != VLC_VAR_BOOL ) &&
1097 ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1099 /* check if option is unsafe */
1102 module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1103 if( !p_config || !p_config->b_safe )
1105 msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1106 "security reasons", psz_name );
1112 /* Create the variable in the input object.
1113 * Children of the input object will be able to retreive this value
1114 * thanks to the inheritance property of the object variables. */
1115 __var_Create( p_obj, psz_name, i_type );
1120 val.b_bool = !b_isno;
1123 case VLC_VAR_INTEGER:
1124 val.i_int = strtol( psz_value, NULL, 0 );
1128 val.f_float = us_atof( psz_value );
1131 case VLC_VAR_STRING:
1132 case VLC_VAR_MODULE:
1134 case VLC_VAR_DIRECTORY:
1135 val.psz_string = psz_value;
1140 char *psz_orig, *psz_var;
1141 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1142 val.p_list = p_list;
1143 p_list->i_count = 0;
1145 psz_var = psz_orig = strdup(psz_value);
1146 while( psz_var && *psz_var )
1148 char *psz_item = psz_var;
1150 while( *psz_var && *psz_var != ',' ) psz_var++;
1151 if( *psz_var == ',' )
1156 val2.i_int = strtol( psz_item, NULL, 0 );
1157 INSERT_ELEM( p_list->p_values, p_list->i_count,
1158 p_list->i_count, val2 );
1159 /* p_list->i_count is incremented twice by INSERT_ELEM */
1161 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1162 p_list->i_count, VLC_VAR_INTEGER );
1172 __var_Set( p_obj, psz_name, val );
1174 /* If that's a list, remove all elements allocated */
1175 if( i_type == VLC_VAR_LIST )
1183 /* Following functions are local */
1185 /*****************************************************************************
1186 * GetUnused: find an unused (not in callback) variable from its name
1187 *****************************************************************************
1188 * We do i_tries tries before giving up, just in case the variable is being
1189 * modified and called from a callback.
1190 *****************************************************************************/
1191 static int GetUnused( vlc_object_t *p_this, const char *psz_name )
1195 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1201 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1207 if( ! p_priv->p_vars[i_var].b_incallback )
1212 mutex_cleanup_push( &p_priv->var_lock );
1213 vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1218 /*****************************************************************************
1219 * HashString: our cool hash function
1220 *****************************************************************************
1221 * This function is not intended to be crypto-secure, we only want it to be
1222 * fast and not suck too much. This one is pretty fast and did 0 collisions
1223 * in wenglish's dictionary.
1224 *****************************************************************************/
1225 static uint32_t HashString( const char *psz_string )
1227 uint32_t i_hash = 0;
1229 while( *psz_string )
1231 i_hash += *psz_string++;
1232 i_hash += i_hash << 10;
1233 i_hash ^= i_hash >> 8;
1239 /*****************************************************************************
1240 * Insert: find an empty slot to insert a new variable
1241 *****************************************************************************
1242 * We use a recursive inner function indexed on the hash. This function does
1243 * nothing in the rare cases where a collision may occur, see Lookup()
1244 * to see how we handle them.
1245 * XXX: does this really need to be written recursively?
1246 *****************************************************************************/
1247 static int Insert( variable_t *p_vars, int i_count, const char *psz_name )
1254 return InsertInner( p_vars, i_count, HashString( psz_name ) );
1257 static int InsertInner( variable_t *p_vars, int i_count, uint32_t i_hash )
1261 if( i_hash <= p_vars[0].i_hash )
1266 if( i_hash >= p_vars[i_count - 1].i_hash )
1271 i_middle = i_count / 2;
1273 /* We know that 0 < i_middle */
1274 if( i_hash < p_vars[i_middle].i_hash )
1276 return InsertInner( p_vars, i_middle, i_hash );
1279 /* We know that i_middle + 1 < i_count */
1280 if( i_hash > p_vars[i_middle + 1].i_hash )
1282 return i_middle + 1 + InsertInner( p_vars + i_middle + 1,
1283 i_count - i_middle - 1,
1287 return i_middle + 1;
1290 static int u32cmp( const void *key, const void *data )
1292 const variable_t *p_var = data;
1293 uint32_t hash = *(const uint32_t *)key ;
1295 if( hash > p_var->i_hash )
1297 if( hash < p_var->i_hash )
1302 /*****************************************************************************
1303 * Lookup: find an existing variable given its name
1304 *****************************************************************************
1305 * We use a recursive inner function indexed on the hash. Care is taken of
1306 * possible hash collisions.
1307 *****************************************************************************/
1308 static int Lookup( variable_t *p_vars, size_t i_count, const char *psz_name )
1313 i_hash = HashString( psz_name );
1314 p_var = bsearch( &i_hash, p_vars, i_count, sizeof( *p_var ), u32cmp );
1316 /* Hash not found */
1320 assert( i_count > 0 );
1322 /* Find the first entry with the right hash */
1323 while( (p_var > p_vars) && (i_hash == p_var[-1].i_hash) )
1326 assert( p_var->i_hash == i_hash );
1328 /* Hash collision should be very unlikely, but we cannot guarantee
1329 * it will never happen. So we do an exhaustive search amongst all
1330 * entries with the same hash. Typically, there is only one anyway. */
1331 for( variable_t *p_end = p_vars + i_count;
1332 (p_var < p_end) && (i_hash == p_var->i_hash);
1335 if( !strcmp( psz_name, p_var->psz_name ) )
1336 return p_var - p_vars;
1339 /* Hash found, but entry not found */
1343 /*****************************************************************************
1344 * CheckValue: check that a value is valid wrt. a variable
1345 *****************************************************************************
1346 * This function checks p_val's value against p_var's limitations such as
1347 * minimal and maximal value, step, in-list position, and modifies p_val if
1349 ****************************************************************************/
1350 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1352 /* Check that our variable is in the list */
1353 if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1357 /* This list is not sorted so go throug it (this is a small list) */
1358 for( i = p_var->choices.i_count ; i-- ; )
1360 if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1366 /* If not found, change it to anything vaguely valid */
1369 /* Free the old variable, get the new one, dup it */
1370 p_var->ops->pf_free( p_val );
1371 *p_val = p_var->choices.p_values[p_var->i_default >= 0
1372 ? p_var->i_default : 0 ];
1373 p_var->ops->pf_dup( p_val );
1377 /* Check that our variable is within the bounds */
1378 switch( p_var->i_type & VLC_VAR_TYPE )
1380 case VLC_VAR_INTEGER:
1381 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1382 && (p_val->i_int % p_var->step.i_int) )
1384 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1385 / p_var->step.i_int * p_var->step.i_int;
1387 if( p_var->i_type & VLC_VAR_HASMIN
1388 && p_val->i_int < p_var->min.i_int )
1390 p_val->i_int = p_var->min.i_int;
1392 if( p_var->i_type & VLC_VAR_HASMAX
1393 && p_val->i_int > p_var->max.i_int )
1395 p_val->i_int = p_var->max.i_int;
1399 if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1401 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1402 p_val->f_float / p_var->step.f_float );
1403 if( p_val->f_float != f_round )
1405 p_val->f_float = f_round;
1408 if( p_var->i_type & VLC_VAR_HASMIN
1409 && p_val->f_float < p_var->min.f_float )
1411 p_val->f_float = p_var->min.f_float;
1413 if( p_var->i_type & VLC_VAR_HASMAX
1414 && p_val->f_float > p_var->max.f_float )
1416 p_val->f_float = p_var->max.f_float;
1425 /*****************************************************************************
1426 * InheritValue: try to inherit the value of this variable from the same one
1427 * in our closest parent, libvlc or ultimately from the configuration.
1428 * The function should always be entered with the object var_lock locked.
1429 *****************************************************************************/
1430 static int InheritValue( vlc_object_t *p_this, const char *psz_name,
1431 vlc_value_t *p_val, int i_type )
1436 if( p_this->p_parent || ( p_this->p_libvlc && p_this != (vlc_object_t*) p_this->p_libvlc ) )
1438 vlc_object_internals_t *p_priv;
1440 if( p_this->p_parent )
1441 p_priv = vlc_internals( p_this->p_parent );
1443 p_priv = vlc_internals( p_this->p_libvlc );
1445 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1450 p_var = &p_priv->p_vars[i_var];
1452 /* Really get the variable */
1453 *p_val = p_var->val;
1455 /* Duplicate value if needed */
1456 p_var->ops->pf_dup( p_val );
1458 /*msg_Dbg( p_this, "Inherited value for var %s from object %s",
1459 psz_name ? psz_name : "(null)",
1460 p_this->psz_object_name
1461 ? p_this->psz_object_name : "(Unknown)" );*/
1464 else if ( p_this->p_parent ) /* We are still not there */
1465 return InheritValue( p_this->p_parent, psz_name, p_val, i_type );
1467 /* else take value from config */
1471 switch( i_type & VLC_VAR_CLASS )
1473 case VLC_VAR_STRING:
1474 p_val->psz_string = config_GetPsz( p_this, psz_name );
1475 if( !p_val->psz_string ) p_val->psz_string = strdup("");
1478 p_val->f_float = config_GetFloat( p_this, psz_name );
1480 case VLC_VAR_INTEGER:
1481 p_val->i_int = config_GetInt( p_this, psz_name );
1484 p_val->b_bool = config_GetInt( p_this, psz_name );
1488 char *psz_orig, *psz_var;
1489 vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1490 p_val->p_list = p_list;
1491 p_list->i_count = 0;
1493 psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1494 while( psz_var && *psz_var )
1496 char *psz_item = psz_var;
1498 while( *psz_var && *psz_var != ',' ) psz_var++;
1499 if( *psz_var == ',' )
1504 val.i_int = strtol( psz_item, NULL, 0 );
1505 INSERT_ELEM( p_list->p_values, p_list->i_count,
1506 p_list->i_count, val );
1507 /* p_list->i_count is incremented twice by INSERT_ELEM */
1509 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1510 p_list->i_count, VLC_VAR_INTEGER );
1516 msg_Warn( p_this, "Could not inherit value for var %s "
1517 "from config. Invalid Type", psz_name );
1521 /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1526 /**********************************************************************
1527 * Trigger the callbacks.
1528 * Tell we're in a callback, release the lock, call stored functions,
1530 **********************************************************************/
1531 static int TriggerCallback( vlc_object_t *p_this, variable_t **pp_var,
1532 const char *psz_name, vlc_value_t oldval )
1535 int i_entries = (*pp_var)->i_entries;
1536 callback_entry_t *p_entries = (*pp_var)->p_entries;
1540 vlc_object_internals_t *p_priv = vlc_internals( p_this );
1542 (*pp_var)->b_incallback = true;
1543 vlc_mutex_unlock( &p_priv->var_lock );
1545 /* The real calls */
1546 for( ; i_entries-- ; )
1548 p_entries[i_entries].pf_callback( p_this, psz_name, oldval, (*pp_var)->val,
1549 p_entries[i_entries].p_data );
1552 vlc_mutex_lock( &p_priv->var_lock );
1554 i_var = Lookup( p_priv->p_vars, p_priv->i_vars, psz_name );
1557 msg_Err( p_this, "variable %s has disappeared", psz_name );
1561 *pp_var = &p_priv->p_vars[i_var];
1562 (*pp_var)->b_incallback = false;
1563 vlc_cond_broadcast( &p_priv->var_wait );
1569 /**********************************************************************
1570 * Execute a var command on an object identified by its name
1571 **********************************************************************/
1572 int __var_Command( vlc_object_t *p_this, const char *psz_name,
1573 const char *psz_cmd, const char *psz_arg, char **psz_msg )
1575 vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1576 psz_name, FIND_CHILD );
1582 *psz_msg = strdup( "Unknown destination object." );
1586 i_type = var_Type( p_obj, psz_cmd );
1587 if( !( i_type&VLC_VAR_ISCOMMAND ) )
1589 vlc_object_release( p_obj );
1591 *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1592 return VLC_EGENERIC;
1595 i_type &= VLC_VAR_CLASS;
1598 case VLC_VAR_INTEGER:
1599 i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1602 i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
1604 case VLC_VAR_STRING:
1605 i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1608 i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1611 i_ret = VLC_EGENERIC;
1615 vlc_object_release( p_obj );
1619 if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1620 psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1629 * Free a list and the associated strings
1630 * @param p_val: the list variable
1631 * @param p_val2: the variable associated or NULL
1633 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1636 if( p_val2 && p_val2->p_list )
1638 for( int i = 0; i < p_val2->p_list->i_count; i++ )
1639 free( p_val2->p_list->p_values[i].psz_string );
1640 if( p_val2->p_list->i_count )
1642 free( p_val2->p_list->p_values );
1643 free( p_val2->p_list->pi_types );
1645 free( p_val2->p_list );