src/misc/variables.c

   1 /*****************************************************************************
   2  * variables.c: routines for object variables handling
   3  *****************************************************************************
   4  * Copyright (C) 2002-2009 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   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.
  13  *
  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.
  18  *
  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  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Preamble
  26  *****************************************************************************/
  27 #ifdef HAVE_CONFIG_H
  28 # include "config.h"
  29 #endif
  30
  31 #include <vlc_common.h>
  32 #include <vlc_charset.h>
  33 #include "variables.h"
  34
  35 #include "libvlc.h"
  36
  37 #include <search.h>
  38 #include <assert.h>
  39 #include <math.h>
  40 #include <limits.h>
  41
  42 /*****************************************************************************
  43  * Private types
  44  *****************************************************************************/
  45 struct callback_entry_t
  46 {
  47     vlc_callback_t pf_callback;
  48     void *         p_data;
  49 };
  50
  51 /*****************************************************************************
  52  * Local comparison functions, returns 0 if v == w, < 0 if v < w, > 0 if v > w
  53  *****************************************************************************/
  54 static int CmpBool( vlc_value_t v, vlc_value_t w )
  55 {
  56     return v.b_bool ? w.b_bool ? 0 : 1 : w.b_bool ? -1 : 0;
  57 }
  58
  59 static int CmpInt( vlc_value_t v, vlc_value_t w )
  60 {
  61     return v.i_int == w.i_int ? 0 : v.i_int > w.i_int ? 1 : -1;
  62 }
  63
  64 static int CmpTime( vlc_value_t v, vlc_value_t w )
  65 {
  66     return v.i_time == w.i_time ? 0 : v.i_time > w.i_time ? 1 : -1;
  67 }
  68
  69 static int CmpString( vlc_value_t v, vlc_value_t w )
  70 {
  71     if( !v.psz_string )
  72         return !w.psz_string ? 0 : -1;
  73     else
  74         return !w.psz_string ? 1 : strcmp( v.psz_string, w.psz_string );
  75 }
  76 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; }
  77 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; }
  78
  79 /*****************************************************************************
  80  * Local duplication functions, and local deallocation functions
  81  *****************************************************************************/
  82 static void DupDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
  83 static void DupString( vlc_value_t *p_val )
  84 {
  85     p_val->psz_string = strdup( p_val->psz_string ? p_val->psz_string :  "" );
  86 }
  87
  88 static void DupList( vlc_value_t *p_val )
  89 {
  90     int i;
  91     vlc_list_t *p_list = malloc( sizeof(vlc_list_t) );
  92
  93     p_list->i_count = p_val->p_list->i_count;
  94     if( p_val->p_list->i_count )
  95     {
  96         p_list->p_values = malloc( p_list->i_count * sizeof(vlc_value_t) );
  97         p_list->pi_types = malloc( p_list->i_count * sizeof(int) );
  98     }
  99     else
 100     {
 101         p_list->p_values = NULL;
 102         p_list->pi_types = NULL;
 103     }
 104
 105     for( i = 0; i < p_list->i_count; i++ )
 106     {
 107         p_list->p_values[i] = p_val->p_list->p_values[i];
 108         p_list->pi_types[i] = p_val->p_list->pi_types[i];
 109         switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
 110         {
 111         case VLC_VAR_STRING:
 112
 113             DupString( &p_list->p_values[i] );
 114             break;
 115         default:
 116             break;
 117         }
 118     }
 119
 120     p_val->p_list = p_list;
 121 }
 122
 123 static void FreeDummy( vlc_value_t *p_val ) { (void)p_val; /* unused */ }
 124 static void FreeString( vlc_value_t *p_val ) { free( p_val->psz_string ); }
 125 static void FreeMutex( vlc_value_t *p_val ) { vlc_mutex_destroy( (vlc_mutex_t*)p_val->p_address ); free( p_val->p_address ); }
 126
 127 static void FreeList( vlc_value_t *p_val )
 128 {
 129     int i;
 130     for( i = 0; i < p_val->p_list->i_count; i++ )
 131     {
 132         switch( p_val->p_list->pi_types[i] & VLC_VAR_CLASS )
 133         {
 134         case VLC_VAR_STRING:
 135             FreeString( &p_val->p_list->p_values[i] );
 136             break;
 137         case VLC_VAR_MUTEX:
 138             FreeMutex( &p_val->p_list->p_values[i] );
 139             break;
 140         default:
 141             break;
 142         }
 143     }
 144
 145     if( p_val->p_list->i_count )
 146     {
 147         free( p_val->p_list->p_values );
 148         free( p_val->p_list->pi_types );
 149     }
 150     free( p_val->p_list );
 151 }
 152
 153 static const struct variable_ops_t
 154 void_ops   = { NULL,       DupDummy,  FreeDummy,  },
 155 addr_ops   = { CmpAddress, DupDummy,  FreeDummy,  },
 156 bool_ops   = { CmpBool,    DupDummy,  FreeDummy,  },
 157 float_ops  = { CmpFloat,   DupDummy,  FreeDummy,  },
 158 int_ops    = { CmpInt,     DupDummy,  FreeDummy,  },
 159 list_ops   = { CmpAddress, DupList,   FreeList,   },
 160 mutex_ops  = { CmpAddress, DupDummy,  FreeMutex,  },
 161 string_ops = { CmpString,  DupString, FreeString, },
 162 time_ops   = { CmpTime,    DupDummy,  FreeDummy,  },
 163 coords_ops = { NULL,       DupDummy,  FreeDummy,  };
 164
 165 /*****************************************************************************
 166  * Local prototypes
 167  *****************************************************************************/
 168 static void     WaitUnused  ( vlc_object_t *, variable_t * );
 169
 170 static void     CheckValue  ( variable_t *, vlc_value_t * );
 171
 172 static int      TriggerCallback( vlc_object_t *, variable_t *, const char *,
 173                                  vlc_value_t );
 174
 175 static int varcmp( const void *a, const void *b )
 176 {
 177     const variable_t *va = a, *vb = b;
 178
 179     /* psz_name must be first */
 180     assert( va == (const void *)&va->psz_name );
 181     return strcmp( va->psz_name, vb->psz_name );
 182 }
 183
 184 static variable_t *Lookup( vlc_object_t *obj, const char *psz_name )
 185 {
 186     vlc_object_internals_t *priv = vlc_internals( obj );
 187     variable_t **pp_var;
 188
 189     vlc_assert_locked( &priv->var_lock );
 190     pp_var = tfind( &psz_name, &priv->var_root, varcmp );
 191     return (pp_var != NULL) ? *pp_var : NULL;
 192 }
 193
 194 static void Destroy( variable_t *p_var )
 195 {
 196     p_var->ops->pf_free( &p_var->val );
 197     if( p_var->choices.i_count )
 198     {
 199         for( int i = 0 ; i < p_var->choices.i_count ; i++ )
 200         {
 201             p_var->ops->pf_free( &p_var->choices.p_values[i] );
 202             free( p_var->choices_text.p_values[i].psz_string );
 203         }
 204         free( p_var->choices.p_values );
 205         free( p_var->choices_text.p_values );
 206     }
 207     free( p_var->psz_name );
 208     free( p_var->psz_text );
 209     free( p_var->p_entries );
 210     free( p_var );
 211 }
 212
 213 #undef var_Create
 214 /**
 215  * Initialize a vlc variable
 216  *
 217  * We hash the given string and insert it into the sorted list. The insertion
 218  * may require slow memory copies, but think about what we gain in the log(n)
 219  * lookup phase when setting/getting the variable value!
 220  *
 221  * \param p_this The object in which to create the variable
 222  * \param psz_name The name of the variable
 223  * \param i_type The variables type. Must be one of \ref var_type combined with
 224  *               zero or more \ref var_flags
 225  */
 226 int var_Create( vlc_object_t *p_this, const char *psz_name, int i_type )
 227 {
 228     static vlc_list_t dummy_null_list = {0, NULL, NULL};
 229     assert( p_this );
 230
 231     variable_t *p_var = calloc( 1, sizeof( *p_var ) );
 232     if( p_var == NULL )
 233         return VLC_ENOMEM;
 234
 235     p_var->psz_name = strdup( psz_name );
 236     p_var->psz_text = NULL;
 237
 238     p_var->i_type = i_type & ~VLC_VAR_DOINHERIT;
 239
 240     p_var->i_usage = 1;
 241
 242     p_var->i_default = -1;
 243     p_var->choices.i_count = 0;
 244     p_var->choices.p_values = NULL;
 245     p_var->choices_text.i_count = 0;
 246     p_var->choices_text.p_values = NULL;
 247
 248     p_var->b_incallback = false;
 249     p_var->i_entries = 0;
 250     p_var->p_entries = NULL;
 251
 252     /* Always initialize the variable, even if it is a list variable; this
 253      * will lead to errors if the variable is not initialized, but it will
 254      * not cause crashes in the variable handling. */
 255     switch( i_type & VLC_VAR_CLASS )
 256     {
 257         case VLC_VAR_BOOL:
 258             p_var->ops = &bool_ops;
 259             p_var->val.b_bool = false;
 260             break;
 261         case VLC_VAR_INTEGER:
 262             p_var->ops = &int_ops;
 263             p_var->val.i_int = 0;
 264             break;
 265         case VLC_VAR_STRING:
 266             p_var->ops = &string_ops;
 267             p_var->val.psz_string = NULL;
 268             break;
 269         case VLC_VAR_FLOAT:
 270             p_var->ops = &float_ops;
 271             p_var->val.f_float = 0.0;
 272             break;
 273         case VLC_VAR_TIME:
 274             p_var->ops = &time_ops;
 275             p_var->val.i_time = 0;
 276             break;
 277         case VLC_VAR_COORDS:
 278             p_var->ops = &coords_ops;
 279             p_var->val.coords.x = p_var->val.coords.y = 0;
 280             break;
 281         case VLC_VAR_ADDRESS:
 282             p_var->ops = &addr_ops;
 283             p_var->val.p_address = NULL;
 284             break;
 285         case VLC_VAR_MUTEX:
 286             p_var->ops = &mutex_ops;
 287             p_var->val.p_address = malloc( sizeof(vlc_mutex_t) );
 288             vlc_mutex_init( (vlc_mutex_t*)p_var->val.p_address );
 289             break;
 290         case VLC_VAR_LIST:
 291             p_var->ops = &list_ops;
 292             p_var->val.p_list = &dummy_null_list;
 293             break;
 294         default:
 295             p_var->ops = &void_ops;
 296 #ifndef NDEBUG
 297             if( (i_type & VLC_VAR_CLASS) != VLC_VAR_VOID )
 298                 msg_Err( p_this, "Creating the variable '%s' without a type",
 299                           psz_name );
 300 #endif
 301     }
 302
 303     if( i_type & VLC_VAR_DOINHERIT )
 304     {
 305         if( var_Inherit( p_this, psz_name, i_type, &p_var->val ) )
 306             msg_Err( p_this, "cannot inherit value for %s", psz_name );
 307         else if( i_type & VLC_VAR_HASCHOICE )
 308         {
 309             /* We must add the inherited value to our choice list */
 310             p_var->i_default = 0;
 311
 312             INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
 313                          0, p_var->val );
 314             INSERT_ELEM( p_var->choices_text.p_values,
 315                          p_var->choices_text.i_count, 0, p_var->val );
 316             p_var->ops->pf_dup( &p_var->choices.p_values[0] );
 317             p_var->choices_text.p_values[0].psz_string = NULL;
 318         }
 319     }
 320
 321     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 322     variable_t **pp_var, *p_oldvar;
 323     int ret = VLC_SUCCESS;
 324
 325     vlc_mutex_lock( &p_priv->var_lock );
 326
 327     pp_var = tsearch( p_var, &p_priv->var_root, varcmp );
 328     if( unlikely(pp_var == NULL) )
 329         ret = VLC_ENOMEM;
 330     else if( (p_oldvar = *pp_var) == p_var )
 331         p_var = NULL;
 332     else if( unlikely((i_type ^ p_oldvar->i_type) & VLC_VAR_CLASS) )
 333     {    /* If the types differ, variable creation failed. */
 334          msg_Err( p_this, "Variable '%s' (0x%04x) already exist "
 335                   "but with a different type (0x%04x)",
 336                   psz_name, p_oldvar->i_type, i_type );
 337          ret = VLC_EBADVAR;
 338     }
 339     else
 340     {
 341         p_oldvar->i_usage++;
 342         p_oldvar->i_type |= i_type & (VLC_VAR_ISCOMMAND|VLC_VAR_HASCHOICE);
 343     }
 344     vlc_mutex_unlock( &p_priv->var_lock );
 345
 346     /* If we did not need to create a new variable, free everything... */
 347     if( p_var != NULL )
 348         Destroy( p_var );
 349     return ret;
 350 }
 351
 352 #undef var_Destroy
 353 /**
 354  * Destroy a vlc variable
 355  *
 356  * Look for the variable and destroy it if it is found. As in var_Create we
 357  * do a call to memmove() but we have performance counterparts elsewhere.
 358  *
 359  * \param p_this The object that holds the variable
 360  * \param psz_name The name of the variable
 361  */
 362 int var_Destroy( vlc_object_t *p_this, const char *psz_name )
 363 {
 364     variable_t *p_var;
 365
 366     assert( p_this );
 367
 368     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 369
 370     vlc_mutex_lock( &p_priv->var_lock );
 371
 372     p_var = Lookup( p_this, psz_name );
 373     if( p_var == NULL )
 374     {
 375         vlc_mutex_unlock( &p_priv->var_lock );
 376         return VLC_ENOVAR;
 377     }
 378
 379     WaitUnused( p_this, p_var );
 380
 381     if( --p_var->i_usage == 0 )
 382         tdelete( p_var, &p_priv->var_root, varcmp );
 383     else
 384         p_var = NULL;
 385     vlc_mutex_unlock( &p_priv->var_lock );
 386
 387     if( p_var != NULL )
 388         Destroy( p_var );
 389     return VLC_SUCCESS;
 390 }
 391
 392 static void CleanupVar( void *var )
 393 {
 394     Destroy( var );
 395 }
 396
 397 void var_DestroyAll( vlc_object_t *obj )
 398 {
 399     vlc_object_internals_t *priv = vlc_internals( obj );
 400
 401     tdestroy( priv->var_root, CleanupVar );
 402 }
 403
 404 #undef var_Change
 405 /**
 406  * Perform an action on a variable
 407  *
 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
 413  */
 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 )
 416 {
 417     int i;
 418     variable_t *p_var;
 419     vlc_value_t oldval;
 420     vlc_value_t newval;
 421
 422     assert( p_this );
 423
 424     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 425
 426     vlc_mutex_lock( &p_priv->var_lock );
 427
 428     p_var = Lookup( p_this, psz_name );
 429     if( p_var == NULL )
 430     {
 431         vlc_mutex_unlock( &p_priv->var_lock );
 432         return VLC_ENOVAR;
 433     }
 434
 435     switch( i_action )
 436     {
 437         case VLC_VAR_SETMIN:
 438             if( p_var->i_type & VLC_VAR_HASMIN )
 439             {
 440                 p_var->ops->pf_free( &p_var->min );
 441             }
 442             p_var->i_type |= VLC_VAR_HASMIN;
 443             p_var->min = *p_val;
 444             p_var->ops->pf_dup( &p_var->min );
 445             CheckValue( p_var, &p_var->val );
 446             break;
 447         case VLC_VAR_GETMIN:
 448             if( p_var->i_type & VLC_VAR_HASMIN )
 449             {
 450                 *p_val = p_var->min;
 451             }
 452             break;
 453         case VLC_VAR_SETMAX:
 454             if( p_var->i_type & VLC_VAR_HASMAX )
 455             {
 456                 p_var->ops->pf_free( &p_var->max );
 457             }
 458             p_var->i_type |= VLC_VAR_HASMAX;
 459             p_var->max = *p_val;
 460             p_var->ops->pf_dup( &p_var->max );
 461             CheckValue( p_var, &p_var->val );
 462             break;
 463         case VLC_VAR_GETMAX:
 464             if( p_var->i_type & VLC_VAR_HASMAX )
 465             {
 466                 *p_val = p_var->max;
 467             }
 468             break;
 469         case VLC_VAR_SETSTEP:
 470             if( p_var->i_type & VLC_VAR_HASSTEP )
 471             {
 472                 p_var->ops->pf_free( &p_var->step );
 473             }
 474             p_var->i_type |= VLC_VAR_HASSTEP;
 475             p_var->step = *p_val;
 476             p_var->ops->pf_dup( &p_var->step );
 477             CheckValue( p_var, &p_var->val );
 478             break;
 479         case VLC_VAR_GETSTEP:
 480             if( p_var->i_type & VLC_VAR_HASSTEP )
 481             {
 482                 *p_val = p_var->step;
 483             }
 484             break;
 485         case VLC_VAR_ADDCHOICE:
 486             i = p_var->choices.i_count;
 487
 488             INSERT_ELEM( p_var->choices.p_values, p_var->choices.i_count,
 489                          i, *p_val );
 490             INSERT_ELEM( p_var->choices_text.p_values,
 491                          p_var->choices_text.i_count, i, *p_val );
 492             p_var->ops->pf_dup( &p_var->choices.p_values[i] );
 493             p_var->choices_text.p_values[i].psz_string =
 494                 ( p_val2 && p_val2->psz_string ) ?
 495                 strdup( p_val2->psz_string ) : NULL;
 496
 497             CheckValue( p_var, &p_var->val );
 498             break;
 499         case VLC_VAR_DELCHOICE:
 500             for( i = 0 ; i < p_var->choices.i_count ; i++ )
 501             {
 502                 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
 503                 {
 504                     break;
 505                 }
 506             }
 507
 508             if( i == p_var->choices.i_count )
 509             {
 510                 /* Not found */
 511                 vlc_mutex_unlock( &p_priv->var_lock );
 512                 return VLC_EGENERIC;
 513             }
 514
 515             if( p_var->i_default > i )
 516             {
 517                 p_var->i_default--;
 518             }
 519             else if( p_var->i_default == i )
 520             {
 521                 p_var->i_default = -1;
 522             }
 523
 524             p_var->ops->pf_free( &p_var->choices.p_values[i] );
 525             free( p_var->choices_text.p_values[i].psz_string );
 526             REMOVE_ELEM( p_var->choices.p_values, p_var->choices.i_count, i );
 527             REMOVE_ELEM( p_var->choices_text.p_values,
 528                          p_var->choices_text.i_count, i );
 529
 530             CheckValue( p_var, &p_var->val );
 531             break;
 532         case VLC_VAR_CHOICESCOUNT:
 533             p_val->i_int = p_var->choices.i_count;
 534             break;
 535         case VLC_VAR_CLEARCHOICES:
 536             for( i = 0 ; i < p_var->choices.i_count ; i++ )
 537             {
 538                 p_var->ops->pf_free( &p_var->choices.p_values[i] );
 539             }
 540             for( i = 0 ; i < p_var->choices_text.i_count ; i++ )
 541                 free( p_var->choices_text.p_values[i].psz_string );
 542
 543             if( p_var->choices.i_count ) free( p_var->choices.p_values );
 544             if( p_var->choices_text.i_count ) free( p_var->choices_text.p_values );
 545
 546             p_var->choices.i_count = 0;
 547             p_var->choices.p_values = NULL;
 548             p_var->choices_text.i_count = 0;
 549             p_var->choices_text.p_values = NULL;
 550             p_var->i_default = -1;
 551             break;
 552         case VLC_VAR_SETDEFAULT:
 553             /* FIXME: the list is sorted, dude. Use something cleverer. */
 554             for( i = 0 ; i < p_var->choices.i_count ; i++ )
 555             {
 556                 if( p_var->ops->pf_cmp( p_var->choices.p_values[i], *p_val ) == 0 )
 557                 {
 558                     break;
 559                 }
 560             }
 561
 562             if( i == p_var->choices.i_count )
 563             {
 564                 /* Not found */
 565                 break;
 566             }
 567
 568             p_var->i_default = i;
 569             CheckValue( p_var, &p_var->val );
 570             break;
 571         case VLC_VAR_SETVALUE:
 572             /* Duplicate data if needed */
 573             newval = *p_val;
 574             p_var->ops->pf_dup( &newval );
 575             /* Backup needed stuff */
 576             oldval = p_var->val;
 577             /* Check boundaries and list */
 578             CheckValue( p_var, &newval );
 579             /* Set the variable */
 580             p_var->val = newval;
 581             /* Free data if needed */
 582             p_var->ops->pf_free( &oldval );
 583             break;
 584         case VLC_VAR_GETCHOICES:
 585         case VLC_VAR_GETLIST:
 586             p_val->p_list = malloc( sizeof(vlc_list_t) );
 587             if( p_val2 ) p_val2->p_list = malloc( sizeof(vlc_list_t) );
 588             if( p_var->choices.i_count )
 589             {
 590                 p_val->p_list->p_values = malloc( p_var->choices.i_count
 591                                                   * sizeof(vlc_value_t) );
 592                 p_val->p_list->pi_types = malloc( p_var->choices.i_count
 593                                                   * sizeof(int) );
 594                 if( p_val2 )
 595                 {
 596                     p_val2->p_list->p_values =
 597                         malloc( p_var->choices.i_count * sizeof(vlc_value_t) );
 598                     p_val2->p_list->pi_types =
 599                         malloc( p_var->choices.i_count * sizeof(int) );
 600                 }
 601             }
 602             p_val->p_list->i_count = p_var->choices.i_count;
 603             if( p_val2 ) p_val2->p_list->i_count = p_var->choices.i_count;
 604             for( i = 0 ; i < p_var->choices.i_count ; i++ )
 605             {
 606                 p_val->p_list->p_values[i] = p_var->choices.p_values[i];
 607                 p_val->p_list->pi_types[i] = p_var->i_type;
 608                 p_var->ops->pf_dup( &p_val->p_list->p_values[i] );
 609                 if( p_val2 )
 610                 {
 611                     p_val2->p_list->p_values[i].psz_string =
 612                         p_var->choices_text.p_values[i].psz_string ?
 613                     strdup(p_var->choices_text.p_values[i].psz_string) : NULL;
 614                     p_val2->p_list->pi_types[i] = VLC_VAR_STRING;
 615                 }
 616             }
 617             break;
 618         case VLC_VAR_SETTEXT:
 619             free( p_var->psz_text );
 620             if( p_val && p_val->psz_string )
 621                 p_var->psz_text = strdup( p_val->psz_string );
 622             else
 623                 p_var->psz_text = NULL;
 624             break;
 625         case VLC_VAR_GETTEXT:
 626             p_val->psz_string = p_var->psz_text ? strdup( p_var->psz_text )
 627                                                 : NULL;
 628             break;
 629         case VLC_VAR_SETISCOMMAND:
 630             p_var->i_type |= VLC_VAR_ISCOMMAND;
 631             break;
 632
 633         default:
 634             break;
 635     }
 636
 637     vlc_mutex_unlock( &p_priv->var_lock );
 638
 639     return VLC_SUCCESS;
 640 }
 641
 642 #undef var_GetAndSet
 643 /**
 644  * Perform a Get and Set on a variable
 645  *
 646  * \param p_this: The object that hold the variable
 647  * \param psz_name: the name of the variable
 648  * \param i_action: the action to perform
 649  * \param p_val: The action parameter
 650  * \return vlc error codes
 651  */
 652 int var_GetAndSet( vlc_object_t *p_this, const char *psz_name, int i_action,
 653                    vlc_value_t *p_val )
 654 {
 655     int i_ret;
 656     variable_t *p_var;
 657     vlc_value_t oldval;
 658
 659     assert( p_this );
 660     assert( p_val );
 661
 662     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 663
 664     vlc_mutex_lock( &p_priv->var_lock );
 665     p_var = Lookup( p_this, psz_name );
 666     if( p_var == NULL )
 667     {
 668         vlc_mutex_unlock( &p_priv->var_lock );
 669         return VLC_ENOVAR;
 670     }
 671
 672     WaitUnused( p_this, p_var );
 673
 674     /* Duplicated data if needed */
 675     //p_var->ops->pf_dup( &val );
 676
 677     /* Backup needed stuff */
 678     oldval = p_var->val;
 679
 680     /* depending of the action requiered */
 681     switch( i_action )
 682     {
 683     case VLC_VAR_BOOL_TOGGLE:
 684         assert( ( p_var->i_type & VLC_VAR_BOOL ) == VLC_VAR_BOOL );
 685         p_var->val.b_bool = !p_var->val.b_bool;
 686         break;
 687     case VLC_VAR_INTEGER_ADD:
 688         assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
 689         p_var->val.i_int += p_val->i_int;
 690         break;
 691     case VLC_VAR_INTEGER_OR:
 692         assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
 693         p_var->val.i_int |= p_val->i_int;
 694         break;
 695     case VLC_VAR_INTEGER_NAND:
 696         assert( ( p_var->i_type & VLC_VAR_INTEGER ) == VLC_VAR_INTEGER );
 697         p_var->val.i_int &= ~p_val->i_int;
 698         break;
 699     default:
 700         vlc_mutex_unlock( &p_priv->var_lock );
 701         return VLC_EGENERIC;
 702     }
 703
 704     /*  Check boundaries */
 705     CheckValue( p_var, &p_var->val );
 706     *p_val = p_var->val;
 707
 708     /* Deal with callbacks.*/
 709     i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
 710
 711     vlc_mutex_unlock( &p_priv->var_lock );
 712
 713     return i_ret;
 714 }
 715
 716 #undef var_Type
 717 /**
 718  * Request a variable's type
 719  *
 720  * \return The variable type if it exists, or 0 if the
 721  * variable could not be found.
 722  * \see \ref var_type
 723  */
 724 int var_Type( vlc_object_t *p_this, const char *psz_name )
 725 {
 726     variable_t *p_var;
 727     int i_type = 0;
 728
 729     assert( p_this );
 730
 731     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 732
 733     vlc_mutex_lock( &p_priv->var_lock );
 734
 735     p_var = Lookup( p_this, psz_name );
 736     if( p_var != NULL )
 737         i_type = p_var->i_type;
 738
 739     vlc_mutex_unlock( &p_priv->var_lock );
 740
 741     return i_type;
 742 }
 743
 744 #undef var_SetChecked
 745 int var_SetChecked( vlc_object_t *p_this, const char *psz_name,
 746                     int expected_type, vlc_value_t val )
 747 {
 748     int i_ret = VLC_SUCCESS;
 749     variable_t *p_var;
 750     vlc_value_t oldval;
 751
 752     assert( p_this );
 753
 754     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 755
 756     vlc_mutex_lock( &p_priv->var_lock );
 757
 758     p_var = Lookup( p_this, psz_name );
 759     if( p_var == NULL )
 760     {
 761         vlc_mutex_unlock( &p_priv->var_lock );
 762         return VLC_ENOVAR;
 763     }
 764
 765     assert( expected_type == 0 ||
 766             (p_var->i_type & VLC_VAR_CLASS) == expected_type );
 767 #ifndef NDEBUG
 768         /* Alert if the type is VLC_VAR_VOID */
 769         if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
 770             msg_Warn( p_this, "Calling var_Set on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
 771 #endif
 772
 773
 774     WaitUnused( p_this, p_var );
 775
 776     /* Duplicate data if needed */
 777     p_var->ops->pf_dup( &val );
 778
 779     /* Backup needed stuff */
 780     oldval = p_var->val;
 781
 782     /* Check boundaries and list */
 783     CheckValue( p_var, &val );
 784
 785     /* Set the variable */
 786     p_var->val = val;
 787
 788     /* Deal with callbacks */
 789     i_ret = TriggerCallback( p_this, p_var, psz_name, oldval );
 790
 791     /* Free data if needed */
 792     p_var->ops->pf_free( &oldval );
 793
 794     vlc_mutex_unlock( &p_priv->var_lock );
 795
 796     return i_ret;
 797 }
 798
 799 #undef var_Set
 800 /**
 801  * Set a variable's value
 802  *
 803  * \param p_this The object that hold the variable
 804  * \param psz_name The name of the variable
 805  * \param val the value to set
 806  */
 807 int var_Set( vlc_object_t *p_this, const char *psz_name, vlc_value_t val )
 808 {
 809     return var_SetChecked( p_this, psz_name, 0, val );
 810 }
 811
 812 #undef var_GetChecked
 813 int var_GetChecked( vlc_object_t *p_this, const char *psz_name,
 814                     int expected_type, vlc_value_t *p_val )
 815 {
 816     assert( p_this );
 817
 818     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 819     variable_t *p_var;
 820     int err = VLC_SUCCESS;
 821
 822     vlc_mutex_lock( &p_priv->var_lock );
 823
 824     p_var = Lookup( p_this, psz_name );
 825     if( p_var != NULL )
 826     {
 827         assert( expected_type == 0 ||
 828                 (p_var->i_type & VLC_VAR_CLASS) == expected_type );
 829
 830         /* Really get the variable */
 831         *p_val = p_var->val;
 832
 833 #ifndef NDEBUG
 834         /* Alert if the type is VLC_VAR_VOID */
 835         if( ( p_var->i_type & VLC_VAR_TYPE ) == VLC_VAR_VOID )
 836             msg_Warn( p_this, "Calling var_Get on the void variable '%s' (0x%04x)", psz_name, p_var->i_type );
 837 #endif
 838
 839         /* Duplicate value if needed */
 840         p_var->ops->pf_dup( p_val );
 841     }
 842     else
 843         err = VLC_ENOVAR;
 844
 845     vlc_mutex_unlock( &p_priv->var_lock );
 846     return err;
 847 }
 848
 849 #undef var_Get
 850 /**
 851  * Get a variable's value
 852  *
 853  * \param p_this The object that holds the variable
 854  * \param psz_name The name of the variable
 855  * \param p_val Pointer to a vlc_value_t that will hold the variable's value
 856  *              after the function is finished
 857  */
 858 int var_Get( vlc_object_t *p_this, const char *psz_name, vlc_value_t *p_val )
 859 {
 860     return var_GetChecked( p_this, psz_name, 0, p_val );
 861 }
 862
 863 #undef var_AddCallback
 864 /**
 865  * Register a callback in a variable
 866  *
 867  * We store a function pointer that will be called upon variable
 868  * modification.
 869  *
 870  * \param p_this The object that holds the variable
 871  * \param psz_name The name of the variable
 872  * \param pf_callback The function pointer
 873  * \param p_data A generic pointer that will be passed as the last
 874  *               argument to the callback function.
 875  *
 876  * \warning The callback function is run in the thread that calls var_Set on
 877  *          the variable. Use proper locking. This thread may not have much
 878  *          time to spare, so keep callback functions short.
 879  */
 880 int var_AddCallback( vlc_object_t *p_this, const char *psz_name,
 881                      vlc_callback_t pf_callback, void *p_data )
 882 {
 883     variable_t *p_var;
 884     callback_entry_t entry;
 885
 886     assert( p_this );
 887
 888     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 889
 890     entry.pf_callback = pf_callback;
 891     entry.p_data = p_data;
 892
 893     vlc_mutex_lock( &p_priv->var_lock );
 894
 895     p_var = Lookup( p_this, psz_name );
 896     if( p_var == NULL )
 897     {
 898 #ifndef NDEBUG
 899         msg_Warn( p_this, "Failed to add a callback to the non-existing "
 900                           "variable '%s'", psz_name );
 901 #endif
 902         vlc_mutex_unlock( &p_priv->var_lock );
 903         return VLC_ENOVAR;
 904     }
 905
 906     WaitUnused( p_this, p_var );
 907     INSERT_ELEM( p_var->p_entries,
 908                  p_var->i_entries,
 909                  p_var->i_entries,
 910                  entry );
 911
 912     vlc_mutex_unlock( &p_priv->var_lock );
 913
 914     return VLC_SUCCESS;
 915 }
 916
 917 #undef var_DelCallback
 918 /**
 919  * Remove a callback from a variable
 920  *
 921  * pf_callback and p_data have to be given again, because different objects
 922  * might have registered the same callback function.
 923  */
 924 int var_DelCallback( vlc_object_t *p_this, const char *psz_name,
 925                      vlc_callback_t pf_callback, void *p_data )
 926 {
 927     int i_entry;
 928     variable_t *p_var;
 929 #ifndef NDEBUG
 930     bool b_found_similar = false;
 931 #endif
 932
 933     assert( p_this );
 934
 935     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 936
 937     vlc_mutex_lock( &p_priv->var_lock );
 938
 939     p_var = Lookup( p_this, psz_name );
 940     if( p_var == NULL )
 941     {
 942         vlc_mutex_unlock( &p_priv->var_lock );
 943         return VLC_ENOVAR;
 944     }
 945
 946     WaitUnused( p_this, p_var );
 947
 948     for( i_entry = p_var->i_entries ; i_entry-- ; )
 949     {
 950         if( p_var->p_entries[i_entry].pf_callback == pf_callback
 951             && p_var->p_entries[i_entry].p_data == p_data )
 952         {
 953             break;
 954         }
 955 #ifndef NDEBUG
 956         else if( p_var->p_entries[i_entry].pf_callback == pf_callback )
 957             b_found_similar = true;
 958 #endif
 959     }
 960
 961     if( i_entry < 0 )
 962     {
 963 #ifndef NDEBUG
 964         if( b_found_similar )
 965             fprintf( stderr, "Calling var_DelCallback for '%s' with the same "
 966                              "function but not the same data.", psz_name );
 967         assert( 0 );
 968 #endif
 969         vlc_mutex_unlock( &p_priv->var_lock );
 970         return VLC_EGENERIC;
 971     }
 972
 973     REMOVE_ELEM( p_var->p_entries, p_var->i_entries, i_entry );
 974
 975     vlc_mutex_unlock( &p_priv->var_lock );
 976
 977     return VLC_SUCCESS;
 978 }
 979
 980 #undef var_TriggerCallback
 981 /**
 982  * Trigger callback on a variable
 983  *
 984  * \param p_this The object that hold the variable
 985  * \param psz_name The name of the variable
 986  */
 987 int var_TriggerCallback( vlc_object_t *p_this, const char *psz_name )
 988 {
 989     int i_ret;
 990     variable_t *p_var;
 991
 992     assert( p_this );
 993
 994     vlc_object_internals_t *p_priv = vlc_internals( p_this );
 995
 996     vlc_mutex_lock( &p_priv->var_lock );
 997
 998     p_var = Lookup( p_this, psz_name );
 999     if( p_var == NULL )
1000     {
1001         vlc_mutex_unlock( &p_priv->var_lock );
1002         return VLC_ENOVAR;
1003     }
1004
1005     WaitUnused( p_this, p_var );
1006
1007     /* Deal with callbacks. Tell we're in a callback, release the lock,
1008      * call stored functions, retake the lock. */
1009     i_ret = TriggerCallback( p_this, p_var, psz_name, p_var->val );
1010
1011     vlc_mutex_unlock( &p_priv->var_lock );
1012     return i_ret;
1013 }
1014
1015 /** Parse a stringified option
1016  * This function parse a string option and create the associated object
1017  * variable
1018  * The option must be of the form "[no[-]]foo[=bar]" where foo is the
1019  * option name and bar is the value of the option.
1020  * \param p_obj the object in which the variable must be created
1021  * \param psz_option the option to parse
1022  * \param trusted whether the option is set by a trusted input or not
1023  * \return nothing
1024  */
1025 void var_OptionParse( vlc_object_t *p_obj, const char *psz_option,
1026                       bool trusted )
1027 {
1028     char *psz_name, *psz_value;
1029     int  i_type;
1030     bool b_isno = false;
1031     vlc_value_t val;
1032
1033     val.psz_string = NULL;
1034
1035     /* It's too much of a hassle to remove the ':' when we parse
1036      * the cmd line :) */
1037     if( psz_option[0] == ':' )
1038         psz_option++;
1039
1040     if( !psz_option[0] )
1041         return;
1042
1043     psz_name = strdup( psz_option );
1044     if( psz_name == NULL )
1045         return;
1046
1047     psz_value = strchr( psz_name, '=' );
1048     if( psz_value != NULL )
1049         *psz_value++ = '\0';
1050
1051     /* FIXME: :programs should be handled generically */
1052     if( !strcmp( psz_name, "programs" ) )
1053         i_type = VLC_VAR_LIST;
1054     else
1055         i_type = config_GetType( p_obj, psz_name );
1056
1057     if( !i_type && !psz_value )
1058     {
1059         /* check for "no-foo" or "nofoo" */
1060         if( !strncmp( psz_name, "no-", 3 ) )
1061         {
1062             memmove( psz_name, psz_name + 3, strlen(psz_name) + 1 - 3 );
1063         }
1064         else if( !strncmp( psz_name, "no", 2 ) )
1065         {
1066             memmove( psz_name, psz_name + 2, strlen(psz_name) + 1 - 2 );
1067         }
1068         else goto cleanup;           /* Option doesn't exist */
1069
1070         b_isno = true;
1071         i_type = config_GetType( p_obj, psz_name );
1072     }
1073     if( !i_type ) goto cleanup; /* Option doesn't exist */
1074
1075     if( ( i_type != VLC_VAR_BOOL ) &&
1076         ( !psz_value || !*psz_value ) ) goto cleanup; /* Invalid value */
1077
1078     /* check if option is unsafe */
1079     if( !trusted )
1080     {
1081         module_config_t *p_config = config_FindConfig( p_obj, psz_name );
1082         if( !p_config || !p_config->b_safe )
1083         {
1084             msg_Err( p_obj, "unsafe option \"%s\" has been ignored for "
1085                             "security reasons", psz_name );
1086             free( psz_name );
1087             return;
1088         }
1089     }
1090
1091     /* Create the variable in the input object.
1092      * Children of the input object will be able to retreive this value
1093      * thanks to the inheritance property of the object variables. */
1094     var_Create( p_obj, psz_name, i_type );
1095
1096     switch( i_type )
1097     {
1098     case VLC_VAR_BOOL:
1099         val.b_bool = !b_isno;
1100         break;
1101
1102     case VLC_VAR_INTEGER:
1103         val.i_int = strtol( psz_value, NULL, 0 );
1104         break;
1105
1106     case VLC_VAR_FLOAT:
1107         val.f_float = us_atof( psz_value );
1108         break;
1109
1110     case VLC_VAR_STRING:
1111     case VLC_VAR_MODULE:
1112     case VLC_VAR_FILE:
1113     case VLC_VAR_DIRECTORY:
1114         val.psz_string = psz_value;
1115         break;
1116
1117     case VLC_VAR_LIST:
1118     {
1119         char *psz_orig, *psz_var;
1120         vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1121         val.p_list = p_list;
1122         p_list->i_count = 0;
1123
1124         psz_var = psz_orig = strdup(psz_value);
1125         while( psz_var && *psz_var )
1126         {
1127             char *psz_item = psz_var;
1128             vlc_value_t val2;
1129             while( *psz_var && *psz_var != ',' ) psz_var++;
1130             if( *psz_var == ',' )
1131             {
1132                 *psz_var = '\0';
1133                 psz_var++;
1134             }
1135             val2.i_int = strtol( psz_item, NULL, 0 );
1136             INSERT_ELEM( p_list->p_values, p_list->i_count,
1137                          p_list->i_count, val2 );
1138             /* p_list->i_count is incremented twice by INSERT_ELEM */
1139             p_list->i_count--;
1140             INSERT_ELEM( p_list->pi_types, p_list->i_count,
1141                          p_list->i_count, VLC_VAR_INTEGER );
1142         }
1143         free( psz_orig );
1144         break;
1145     }
1146
1147     default:
1148         goto cleanup;
1149     }
1150
1151     var_Set( p_obj, psz_name, val );
1152
1153     /* If that's a list, remove all elements allocated */
1154     if( i_type == VLC_VAR_LIST )
1155         FreeList( &val );
1156
1157 cleanup:
1158     free( psz_name );
1159 }
1160
1161
1162 /* Following functions are local */
1163
1164 /**
1165  * Waits until the variable is inactive (i.e. not executing a callback)
1166  */
1167 static void WaitUnused( vlc_object_t *p_this, variable_t *p_var )
1168 {
1169     vlc_object_internals_t *p_priv = vlc_internals( p_this );
1170
1171     mutex_cleanup_push( &p_priv->var_lock );
1172     while( p_var->b_incallback )
1173         vlc_cond_wait( &p_priv->var_wait, &p_priv->var_lock );
1174     vlc_cleanup_pop( );
1175 }
1176
1177 /*****************************************************************************
1178  * CheckValue: check that a value is valid wrt. a variable
1179  *****************************************************************************
1180  * This function checks p_val's value against p_var's limitations such as
1181  * minimal and maximal value, step, in-list position, and modifies p_val if
1182  * necessary.
1183  ****************************************************************************/
1184 static void CheckValue ( variable_t *p_var, vlc_value_t *p_val )
1185 {
1186     /* Check that our variable is in the list */
1187     if( p_var->i_type & VLC_VAR_HASCHOICE && p_var->choices.i_count )
1188     {
1189         int i;
1190
1191         /* This list is not sorted so go throug it (this is a small list) */
1192         for( i = p_var->choices.i_count ; i-- ; )
1193         {
1194             if( p_var->ops->pf_cmp( *p_val, p_var->choices.p_values[i] ) == 0 )
1195             {
1196                 break;
1197             }
1198         }
1199
1200         /* If not found, change it to anything vaguely valid */
1201         if( i < 0 )
1202         {
1203             /* Free the old variable, get the new one, dup it */
1204             p_var->ops->pf_free( p_val );
1205             *p_val = p_var->choices.p_values[p_var->i_default >= 0
1206                                           ? p_var->i_default : 0 ];
1207             p_var->ops->pf_dup( p_val );
1208         }
1209     }
1210
1211     /* Check that our variable is within the bounds */
1212     switch( p_var->i_type & VLC_VAR_TYPE )
1213     {
1214         case VLC_VAR_INTEGER:
1215             if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.i_int
1216                  && (p_val->i_int % p_var->step.i_int) )
1217             {
1218                 p_val->i_int = (p_val->i_int + (p_var->step.i_int / 2))
1219                                / p_var->step.i_int * p_var->step.i_int;
1220             }
1221             if( p_var->i_type & VLC_VAR_HASMIN
1222                  && p_val->i_int < p_var->min.i_int )
1223             {
1224                 p_val->i_int = p_var->min.i_int;
1225             }
1226             if( p_var->i_type & VLC_VAR_HASMAX
1227                  && p_val->i_int > p_var->max.i_int )
1228             {
1229                 p_val->i_int = p_var->max.i_int;
1230             }
1231             break;
1232         case VLC_VAR_FLOAT:
1233             if( p_var->i_type & VLC_VAR_HASSTEP && p_var->step.f_float )
1234             {
1235                 float f_round = p_var->step.f_float * (float)(int)( 0.5 +
1236                                         p_val->f_float / p_var->step.f_float );
1237                 if( p_val->f_float != f_round )
1238                 {
1239                     p_val->f_float = f_round;
1240                 }
1241             }
1242             if( p_var->i_type & VLC_VAR_HASMIN
1243                  && p_val->f_float < p_var->min.f_float )
1244             {
1245                 p_val->f_float = p_var->min.f_float;
1246             }
1247             if( p_var->i_type & VLC_VAR_HASMAX
1248                  && p_val->f_float > p_var->max.f_float )
1249             {
1250                 p_val->f_float = p_var->max.f_float;
1251             }
1252             break;
1253         case VLC_VAR_TIME:
1254             /* FIXME: TODO */
1255             break;
1256     }
1257 }
1258
1259 /**
1260  * Finds the value of a variable. If the specified object does not hold a
1261  * variable with the specified name, try the parent object, and iterate until
1262  * the top of the tree. If no match is found, the value is read from the
1263  * configuration.
1264  */
1265 int var_Inherit( vlc_object_t *p_this, const char *psz_name, int i_type,
1266                  vlc_value_t *p_val )
1267 {
1268 #ifndef NDEBUG
1269     if (p_this != VLC_OBJECT(p_this->p_libvlc)
1270      && unlikely(p_this->p_parent == NULL))
1271     {
1272         msg_Info (p_this, "%s(%s) on detached object", __func__, psz_name);
1273         //vlc_backtrace ();
1274     }
1275 #endif
1276     i_type &= VLC_VAR_CLASS;
1277     for( vlc_object_t *obj = p_this; obj != NULL; obj = obj->p_parent )
1278     {
1279         if( var_GetChecked( obj, psz_name, i_type, p_val ) == VLC_SUCCESS )
1280             return VLC_SUCCESS;
1281 #ifndef NDEBUG
1282         if (obj != p_this && obj != VLC_OBJECT(p_this->p_libvlc)
1283          && unlikely(obj->p_parent == NULL))
1284         {
1285             msg_Info (p_this, "%s(%s) on detached tree [%p] %s", __func__,
1286                       psz_name, obj, obj->psz_object_type);
1287             //vlc_backtrace ();
1288         }
1289 #endif
1290     }
1291
1292     /* else take value from config */
1293     switch( i_type & VLC_VAR_CLASS )
1294     {
1295         case VLC_VAR_STRING:
1296             p_val->psz_string = config_GetPsz( p_this, psz_name );
1297             if( !p_val->psz_string ) p_val->psz_string = strdup("");
1298             break;
1299         case VLC_VAR_FLOAT:
1300             p_val->f_float = config_GetFloat( p_this, psz_name );
1301             break;
1302         case VLC_VAR_INTEGER:
1303             p_val->i_int = config_GetInt( p_this, psz_name );
1304             break;
1305         case VLC_VAR_BOOL:
1306             p_val->b_bool = config_GetInt( p_this, psz_name );
1307             break;
1308         case VLC_VAR_LIST:
1309         {
1310             char *psz_orig, *psz_var;
1311             vlc_list_t *p_list = malloc(sizeof(vlc_list_t));
1312             p_val->p_list = p_list;
1313             p_list->i_count = 0;
1314
1315             psz_var = psz_orig = config_GetPsz( p_this, psz_name );
1316             while( psz_var && *psz_var )
1317             {
1318                 char *psz_item = psz_var;
1319                 vlc_value_t val;
1320                 while( *psz_var && *psz_var != ',' ) psz_var++;
1321                 if( *psz_var == ',' )
1322                 {
1323                     *psz_var = '\0';
1324                     psz_var++;
1325                 }
1326                 val.i_int = strtol( psz_item, NULL, 0 );
1327                 INSERT_ELEM( p_list->p_values, p_list->i_count,
1328                              p_list->i_count, val );
1329                 /* p_list->i_count is incremented twice by INSERT_ELEM */
1330                 p_list->i_count--;
1331                 INSERT_ELEM( p_list->pi_types, p_list->i_count,
1332                              p_list->i_count, VLC_VAR_INTEGER );
1333             }
1334             free( psz_orig );
1335             break;
1336         }
1337         default:
1338             msg_Warn( p_this, "Could not inherit value for var %s "
1339                               "from config. Invalid Type", psz_name );
1340             return VLC_ENOOBJ;
1341     }
1342     /*msg_Dbg( p_this, "Inherited value for var %s from config", psz_name );*/
1343     return VLC_SUCCESS;
1344 }
1345
1346
1347 /**
1348  * It inherits a string as an unsigned rational number (it also accepts basic
1349  * float number).
1350  *
1351  * It returns an error if the rational number cannot be parsed (0/0 is valid).
1352  * The rational is already reduced.
1353  */
1354 int (var_InheritURational)(vlc_object_t *object,
1355                            unsigned *num, unsigned *den,
1356                            const char *var)
1357 {
1358     /* */
1359     *num = 0;
1360     *den = 0;
1361
1362     /* */
1363     char *tmp = var_InheritString(object, var);
1364     if (!tmp)
1365         goto error;
1366
1367     char *next;
1368     unsigned n = strtol(tmp,  &next, 0);
1369     unsigned d = strtol(*next ? &next[1] : "0", NULL, 0);
1370
1371     if (*next == '.') {
1372         /* Interpret as a float number */
1373         double r = us_atof(tmp);
1374         double c = ceil(r);
1375         if (c >= UINT_MAX)
1376             goto error;
1377         unsigned m = c;
1378         if (m > 0) {
1379             d = UINT_MAX / m;
1380             n = r * d;
1381         } else {
1382             n = 0;
1383             d = 0;
1384         }
1385     }
1386
1387     if (n > 0 && d > 0)
1388         vlc_ureduce(num, den, n, d, 0);
1389
1390     free(tmp);
1391     return VLC_SUCCESS;
1392
1393 error:
1394     free(tmp);
1395     return VLC_EGENERIC;
1396 }
1397
1398 /**********************************************************************
1399  * Trigger the callbacks.
1400  * Tell we're in a callback, release the lock, call stored functions,
1401  * retake the lock.
1402  **********************************************************************/
1403 static int TriggerCallback( vlc_object_t *p_this, variable_t *p_var,
1404                             const char *psz_name, vlc_value_t oldval )
1405 {
1406     assert( p_this );
1407
1408     int i_entries = p_var->i_entries;
1409     if( i_entries == 0 )
1410         return VLC_SUCCESS;
1411
1412     callback_entry_t *p_entries = p_var->p_entries;
1413     vlc_object_internals_t *p_priv = vlc_internals( p_this );
1414
1415     assert( !p_var->b_incallback );
1416     p_var->b_incallback = true;
1417     vlc_mutex_unlock( &p_priv->var_lock );
1418
1419     /* The real calls */
1420     for( ; i_entries-- ; )
1421     {
1422         p_entries[i_entries].pf_callback( p_this, psz_name, oldval, p_var->val,
1423                                           p_entries[i_entries].p_data );
1424     }
1425
1426     vlc_mutex_lock( &p_priv->var_lock );
1427     p_var->b_incallback = false;
1428     vlc_cond_broadcast( &p_priv->var_wait );
1429
1430     return VLC_SUCCESS;
1431 }
1432
1433 #undef var_Command
1434 /**********************************************************************
1435  * Execute a var command on an object identified by its name
1436  **********************************************************************/
1437 int var_Command( vlc_object_t *p_this, const char *psz_name,
1438                  const char *psz_cmd, const char *psz_arg, char **psz_msg )
1439 {
1440     vlc_object_t *p_obj = vlc_object_find_name( p_this->p_libvlc,
1441                                                 psz_name, FIND_CHILD );
1442     int i_type, i_ret;
1443
1444     if( !p_obj )
1445     {
1446         if( psz_msg )
1447             *psz_msg = strdup( "Unknown destination object." );
1448         return VLC_ENOOBJ;
1449     }
1450
1451     i_type = var_Type( p_obj, psz_cmd );
1452     if( !( i_type&VLC_VAR_ISCOMMAND ) )
1453     {
1454         vlc_object_release( p_obj );
1455         if( psz_msg )
1456             *psz_msg = strdup( "Variable doesn't exist or isn't a command." );
1457         return VLC_EGENERIC;
1458     }
1459
1460     i_type &= VLC_VAR_CLASS;
1461     switch( i_type )
1462     {
1463         case VLC_VAR_INTEGER:
1464             i_ret = var_SetInteger( p_obj, psz_cmd, atoi( psz_arg ) );
1465             break;
1466         case VLC_VAR_FLOAT:
1467             i_ret = var_SetFloat( p_obj, psz_cmd, us_atof( psz_arg ) );
1468             break;
1469         case VLC_VAR_STRING:
1470             i_ret = var_SetString( p_obj, psz_cmd, psz_arg );
1471             break;
1472         case VLC_VAR_BOOL:
1473             i_ret = var_SetBool( p_obj, psz_cmd, atoi( psz_arg ) );
1474             break;
1475         default:
1476             i_ret = VLC_EGENERIC;
1477             break;
1478     }
1479
1480     vlc_object_release( p_obj );
1481
1482     if( psz_msg )
1483     {
1484         if( asprintf( psz_msg, "%s on object %s returned %i (%s)",
1485                   psz_cmd, psz_name, i_ret, vlc_error( i_ret ) ) == -1)
1486             *psz_msg = NULL;
1487     }
1488
1489     return i_ret;
1490 }
1491
1492
1493 /**
1494  * Free a list and the associated strings
1495  * @param p_val: the list variable
1496  * @param p_val2: the variable associated or NULL
1497  */
1498 void var_FreeList( vlc_value_t *p_val, vlc_value_t *p_val2 )
1499 {
1500     FreeList( p_val );
1501     if( p_val2 && p_val2->p_list )
1502     {
1503         for( int i = 0; i < p_val2->p_list->i_count; i++ )
1504             free( p_val2->p_list->p_values[i].psz_string );
1505         if( p_val2->p_list->i_count )
1506         {
1507             free( p_val2->p_list->p_values );
1508             free( p_val2->p_list->pi_types );
1509         }
1510         free( p_val2->p_list );
1511     }
1512 }