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prop_bool.c revision 1.14
      1  1.14       ad /*	$NetBSD: prop_bool.c,v 1.14 2008/01/05 01:15:02 ad Exp $	*/
      2   1.1  thorpej 
      3   1.1  thorpej /*-
      4   1.1  thorpej  * Copyright (c) 2006 The NetBSD Foundation, Inc.
      5   1.1  thorpej  * All rights reserved.
      6   1.1  thorpej  *
      7   1.1  thorpej  * This code is derived from software contributed to The NetBSD Foundation
      8   1.1  thorpej  * by Jason R. Thorpe.
      9   1.1  thorpej  *
     10   1.1  thorpej  * Redistribution and use in source and binary forms, with or without
     11   1.1  thorpej  * modification, are permitted provided that the following conditions
     12   1.1  thorpej  * are met:
     13   1.1  thorpej  * 1. Redistributions of source code must retain the above copyright
     14   1.1  thorpej  *    notice, this list of conditions and the following disclaimer.
     15   1.1  thorpej  * 2. Redistributions in binary form must reproduce the above copyright
     16   1.1  thorpej  *    notice, this list of conditions and the following disclaimer in the
     17   1.1  thorpej  *    documentation and/or other materials provided with the distribution.
     18   1.1  thorpej  * 3. All advertising materials mentioning features or use of this software
     19   1.1  thorpej  *    must display the following acknowledgement:
     20   1.1  thorpej  *      This product includes software developed by the NetBSD
     21   1.1  thorpej  *      Foundation, Inc. and its contributors.
     22   1.1  thorpej  * 4. Neither the name of The NetBSD Foundation nor the names of its
     23   1.1  thorpej  *    contributors may be used to endorse or promote products derived
     24   1.1  thorpej  *    from this software without specific prior written permission.
     25   1.1  thorpej  *
     26   1.1  thorpej  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     27   1.1  thorpej  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     28   1.1  thorpej  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     29   1.1  thorpej  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     30   1.1  thorpej  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     31   1.1  thorpej  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     32   1.1  thorpej  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     33   1.1  thorpej  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     34   1.1  thorpej  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     35   1.1  thorpej  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     36   1.1  thorpej  * POSSIBILITY OF SUCH DAMAGE.
     37   1.1  thorpej  */
     38   1.1  thorpej 
     39   1.1  thorpej #include <prop/prop_bool.h>
     40   1.1  thorpej #include "prop_object_impl.h"
     41   1.1  thorpej 
     42   1.1  thorpej struct _prop_bool {
     43   1.1  thorpej 	struct _prop_object	pb_obj;
     44  1.10  thorpej 	bool		pb_value;
     45   1.1  thorpej };
     46   1.1  thorpej 
     47   1.3  thorpej static struct _prop_bool _prop_bool_true;
     48   1.3  thorpej static struct _prop_bool _prop_bool_false;
     49   1.3  thorpej 
     50   1.6  thorpej _PROP_MUTEX_DECL_STATIC(_prop_bool_initialized_mutex)
     51  1.10  thorpej static bool	_prop_bool_initialized;
     52   1.1  thorpej 
     53  1.11    joerg static int		_prop_bool_free(prop_stack_t, prop_object_t *);
     54  1.10  thorpej static bool	_prop_bool_externalize(
     55   1.2  thorpej 				struct _prop_object_externalize_context *,
     56   1.2  thorpej 				void *);
     57  1.12    joerg static bool	_prop_bool_equals(prop_object_t, prop_object_t,
     58  1.12    joerg 				  void **, void **,
     59  1.12    joerg 				  prop_object_t *, prop_object_t *);
     60   1.2  thorpej 
     61   1.2  thorpej static const struct _prop_object_type _prop_object_type_bool = {
     62   1.2  thorpej 	.pot_type	=	PROP_TYPE_BOOL,
     63   1.2  thorpej 	.pot_free	=	_prop_bool_free,
     64   1.2  thorpej 	.pot_extern	=	_prop_bool_externalize,
     65   1.2  thorpej 	.pot_equals	=	_prop_bool_equals,
     66   1.2  thorpej };
     67   1.2  thorpej 
     68   1.2  thorpej #define	prop_object_is_bool(x)		\
     69   1.5  thorpej 	((x) != NULL && (x)->pb_obj.po_type == &_prop_object_type_bool)
     70   1.1  thorpej 
     71  1.11    joerg /* ARGSUSED */
     72  1.11    joerg static int
     73  1.11    joerg _prop_bool_free(prop_stack_t stack, prop_object_t *obj)
     74   1.1  thorpej {
     75   1.3  thorpej 	/*
     76   1.3  thorpej 	 * This should never happen as we "leak" our initial reference
     77   1.3  thorpej 	 * count.
     78   1.3  thorpej 	 */
     79  1.11    joerg 
     80   1.3  thorpej 	/* XXX forced assertion failure? */
     81  1.11    joerg 	return (_PROP_OBJECT_FREE_DONE);
     82   1.1  thorpej }
     83   1.1  thorpej 
     84  1.10  thorpej static bool
     85   1.1  thorpej _prop_bool_externalize(struct _prop_object_externalize_context *ctx,
     86   1.1  thorpej 		       void *v)
     87   1.1  thorpej {
     88   1.1  thorpej 	prop_bool_t pb = v;
     89   1.1  thorpej 
     90   1.1  thorpej 	return (_prop_object_externalize_empty_tag(ctx,
     91   1.1  thorpej 	    pb->pb_value ? "true" : "false"));
     92   1.1  thorpej }
     93   1.1  thorpej 
     94  1.12    joerg /* ARGSUSED */
     95  1.10  thorpej static bool
     96  1.12    joerg _prop_bool_equals(prop_object_t v1, prop_object_t v2,
     97  1.12    joerg     void **stored_pointer1, void **stored_pointer2,
     98  1.12    joerg     prop_object_t *next_obj1, prop_object_t *next_obj2)
     99   1.2  thorpej {
    100   1.2  thorpej 	prop_bool_t b1 = v1;
    101   1.2  thorpej 	prop_bool_t b2 = v2;
    102   1.2  thorpej 
    103   1.4  thorpej 	if (! (prop_object_is_bool(b1) &&
    104   1.4  thorpej 	       prop_object_is_bool(b2)))
    105  1.12    joerg 		return (_PROP_OBJECT_EQUALS_FALSE);
    106   1.3  thorpej 
    107   1.3  thorpej 	/*
    108   1.3  thorpej 	 * Since we only ever allocate one true and one false,
    109   1.3  thorpej 	 * save ourselves a couple of memory operations.
    110   1.3  thorpej 	 */
    111  1.12    joerg 	if (b1 == b2)
    112  1.12    joerg 		return (_PROP_OBJECT_EQUALS_TRUE);
    113  1.12    joerg 	else
    114  1.12    joerg 		return (_PROP_OBJECT_EQUALS_FALSE);
    115   1.2  thorpej }
    116   1.2  thorpej 
    117   1.1  thorpej static prop_bool_t
    118  1.10  thorpej _prop_bool_alloc(bool val)
    119   1.1  thorpej {
    120   1.1  thorpej 	prop_bool_t pb;
    121   1.1  thorpej 
    122   1.3  thorpej 	if (! _prop_bool_initialized) {
    123   1.3  thorpej 		_PROP_MUTEX_LOCK(_prop_bool_initialized_mutex);
    124   1.3  thorpej 		if (! _prop_bool_initialized) {
    125   1.3  thorpej 			_prop_object_init(&_prop_bool_true.pb_obj,
    126   1.3  thorpej 					  &_prop_object_type_bool);
    127  1.10  thorpej 			_prop_bool_true.pb_value = true;
    128   1.3  thorpej 
    129   1.3  thorpej 			_prop_object_init(&_prop_bool_false.pb_obj,
    130   1.3  thorpej 					  &_prop_object_type_bool);
    131  1.10  thorpej 			_prop_bool_false.pb_value = false;
    132   1.3  thorpej 
    133  1.10  thorpej 			_prop_bool_initialized = true;
    134   1.3  thorpej 		}
    135   1.3  thorpej 		_PROP_MUTEX_UNLOCK(_prop_bool_initialized_mutex);
    136   1.1  thorpej 	}
    137   1.1  thorpej 
    138   1.3  thorpej 	pb = val ? &_prop_bool_true : &_prop_bool_false;
    139   1.3  thorpej 	prop_object_retain(pb);
    140   1.3  thorpej 
    141   1.1  thorpej 	return (pb);
    142   1.1  thorpej }
    143   1.1  thorpej 
    144   1.1  thorpej /*
    145   1.1  thorpej  * prop_bool_create --
    146   1.1  thorpej  *	Create a prop_bool_t and initialize it with the
    147   1.1  thorpej  *	provided boolean value.
    148   1.1  thorpej  */
    149   1.1  thorpej prop_bool_t
    150  1.10  thorpej prop_bool_create(bool val)
    151   1.1  thorpej {
    152   1.1  thorpej 
    153   1.3  thorpej 	return (_prop_bool_alloc(val));
    154   1.1  thorpej }
    155   1.1  thorpej 
    156   1.1  thorpej /*
    157   1.1  thorpej  * prop_bool_copy --
    158   1.1  thorpej  *	Copy a prop_bool_t.
    159   1.1  thorpej  */
    160   1.1  thorpej prop_bool_t
    161   1.1  thorpej prop_bool_copy(prop_bool_t opb)
    162   1.1  thorpej {
    163   1.1  thorpej 
    164   1.4  thorpej 	if (! prop_object_is_bool(opb))
    165   1.4  thorpej 		return (NULL);
    166   1.1  thorpej 
    167   1.3  thorpej 	/*
    168   1.3  thorpej 	 * Because we only ever allocate one true and one false, this
    169   1.3  thorpej 	 * can be reduced to a simple retain operation.
    170   1.3  thorpej 	 */
    171   1.3  thorpej 	prop_object_retain(opb);
    172   1.3  thorpej 	return (opb);
    173   1.1  thorpej }
    174   1.1  thorpej 
    175   1.1  thorpej /*
    176   1.1  thorpej  * prop_bool_true --
    177   1.1  thorpej  *	Get the value of a prop_bool_t.
    178   1.1  thorpej  */
    179  1.10  thorpej bool
    180   1.1  thorpej prop_bool_true(prop_bool_t pb)
    181   1.1  thorpej {
    182   1.1  thorpej 
    183   1.4  thorpej 	if (! prop_object_is_bool(pb))
    184  1.10  thorpej 		return (false);
    185   1.4  thorpej 
    186   1.1  thorpej 	return (pb->pb_value);
    187   1.1  thorpej }
    188   1.1  thorpej 
    189   1.1  thorpej /*
    190   1.2  thorpej  * prop_bool_equals --
    191  1.10  thorpej  *	Return true if the boolean values are equivalent.
    192   1.2  thorpej  */
    193  1.10  thorpej bool
    194   1.2  thorpej prop_bool_equals(prop_bool_t b1, prop_bool_t b2)
    195   1.2  thorpej {
    196  1.12    joerg 	if (!prop_object_is_bool(b1) || !prop_object_is_bool(b2))
    197  1.12    joerg 		return (false);
    198   1.2  thorpej 
    199  1.12    joerg 	return (prop_object_equals(b1, b2));
    200   1.2  thorpej }
    201   1.2  thorpej 
    202   1.2  thorpej /*
    203   1.1  thorpej  * _prop_bool_internalize --
    204   1.1  thorpej  *	Parse a <true/> or <false/> and return the object created from
    205   1.1  thorpej  *	the external representation.
    206   1.1  thorpej  */
    207  1.11    joerg 
    208  1.11    joerg /* ARGSUSED */
    209  1.11    joerg bool
    210  1.11    joerg _prop_bool_internalize(prop_stack_t stack, prop_object_t *obj,
    211  1.11    joerg     struct _prop_object_internalize_context *ctx)
    212   1.1  thorpej {
    213  1.10  thorpej 	bool val;
    214   1.1  thorpej 
    215   1.1  thorpej 	/* No attributes, and it must be an empty element. */
    216   1.1  thorpej 	if (ctx->poic_tagattr != NULL ||
    217  1.10  thorpej 	    ctx->poic_is_empty_element == false)
    218  1.11    joerg 	    	return (true);
    219   1.1  thorpej 
    220   1.1  thorpej 	if (_PROP_TAG_MATCH(ctx, "true"))
    221  1.10  thorpej 		val = true;
    222   1.1  thorpej 	else {
    223   1.1  thorpej 		_PROP_ASSERT(_PROP_TAG_MATCH(ctx, "false"));
    224  1.10  thorpej 		val = false;
    225   1.1  thorpej 	}
    226  1.11    joerg 	*obj = prop_bool_create(val);
    227  1.11    joerg 	return (true);
    228   1.1  thorpej }
    229