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prop_bool.c revision 1.3.2.2
      1  1.3.2.1     tron /*	$NetBSD: prop_bool.c,v 1.3.2.2 2006/08/27 01:20:56 riz 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      1.1  thorpej 	boolean_t		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      1.3  thorpej _PROP_MUTEX_DECL(_prop_bool_initialized_mutex)
     51      1.3  thorpej static boolean_t	_prop_bool_initialized;
     52      1.1  thorpej 
     53      1.2  thorpej static void		_prop_bool_free(void *);
     54      1.2  thorpej static boolean_t	_prop_bool_externalize(
     55      1.2  thorpej 				struct _prop_object_externalize_context *,
     56      1.2  thorpej 				void *);
     57      1.2  thorpej static boolean_t	_prop_bool_equals(void *, void *);
     58      1.2  thorpej 
     59      1.2  thorpej static const struct _prop_object_type _prop_object_type_bool = {
     60      1.2  thorpej 	.pot_type	=	PROP_TYPE_BOOL,
     61      1.2  thorpej 	.pot_free	=	_prop_bool_free,
     62      1.2  thorpej 	.pot_extern	=	_prop_bool_externalize,
     63      1.2  thorpej 	.pot_equals	=	_prop_bool_equals,
     64      1.2  thorpej };
     65      1.2  thorpej 
     66      1.2  thorpej #define	prop_object_is_bool(x)		\
     67  1.3.2.2      riz 	((x) != NULL && (x)->pb_obj.po_type == &_prop_object_type_bool)
     68      1.1  thorpej 
     69      1.1  thorpej static void
     70      1.1  thorpej _prop_bool_free(void *v)
     71      1.1  thorpej {
     72      1.1  thorpej 
     73      1.3  thorpej 	/*
     74      1.3  thorpej 	 * This should never happen as we "leak" our initial reference
     75      1.3  thorpej 	 * count.
     76      1.3  thorpej 	 */
     77      1.3  thorpej 	/* XXX forced assertion failure? */
     78      1.1  thorpej }
     79      1.1  thorpej 
     80      1.1  thorpej static boolean_t
     81      1.1  thorpej _prop_bool_externalize(struct _prop_object_externalize_context *ctx,
     82      1.1  thorpej 		       void *v)
     83      1.1  thorpej {
     84      1.1  thorpej 	prop_bool_t pb = v;
     85      1.1  thorpej 
     86      1.1  thorpej 	return (_prop_object_externalize_empty_tag(ctx,
     87      1.1  thorpej 	    pb->pb_value ? "true" : "false"));
     88      1.1  thorpej }
     89      1.1  thorpej 
     90      1.2  thorpej static boolean_t
     91      1.2  thorpej _prop_bool_equals(void *v1, void *v2)
     92      1.2  thorpej {
     93      1.2  thorpej 	prop_bool_t b1 = v1;
     94      1.2  thorpej 	prop_bool_t b2 = v2;
     95      1.2  thorpej 
     96  1.3.2.1     tron 	if (! (prop_object_is_bool(b1) &&
     97  1.3.2.1     tron 	       prop_object_is_bool(b2)))
     98  1.3.2.1     tron 		return (FALSE);
     99      1.3  thorpej 
    100      1.3  thorpej 	/*
    101      1.3  thorpej 	 * Since we only ever allocate one true and one false,
    102      1.3  thorpej 	 * save ourselves a couple of memory operations.
    103      1.3  thorpej 	 */
    104      1.3  thorpej 	return (b1 == b2);
    105      1.2  thorpej }
    106      1.2  thorpej 
    107      1.1  thorpej static prop_bool_t
    108      1.3  thorpej _prop_bool_alloc(boolean_t val)
    109      1.1  thorpej {
    110      1.1  thorpej 	prop_bool_t pb;
    111      1.1  thorpej 
    112      1.3  thorpej 	if (! _prop_bool_initialized) {
    113      1.3  thorpej 		_PROP_MUTEX_LOCK(_prop_bool_initialized_mutex);
    114      1.3  thorpej 		if (! _prop_bool_initialized) {
    115      1.3  thorpej 			_prop_object_init(&_prop_bool_true.pb_obj,
    116      1.3  thorpej 					  &_prop_object_type_bool);
    117      1.3  thorpej 			_prop_bool_true.pb_value = TRUE;
    118      1.3  thorpej 
    119      1.3  thorpej 			_prop_object_init(&_prop_bool_false.pb_obj,
    120      1.3  thorpej 					  &_prop_object_type_bool);
    121      1.3  thorpej 			_prop_bool_false.pb_value = FALSE;
    122      1.3  thorpej 
    123      1.3  thorpej 			_prop_bool_initialized = TRUE;
    124      1.3  thorpej 		}
    125      1.3  thorpej 		_PROP_MUTEX_UNLOCK(_prop_bool_initialized_mutex);
    126      1.1  thorpej 	}
    127      1.1  thorpej 
    128      1.3  thorpej 	pb = val ? &_prop_bool_true : &_prop_bool_false;
    129      1.3  thorpej 	prop_object_retain(pb);
    130      1.3  thorpej 
    131      1.1  thorpej 	return (pb);
    132      1.1  thorpej }
    133      1.1  thorpej 
    134      1.1  thorpej /*
    135      1.1  thorpej  * prop_bool_create --
    136      1.1  thorpej  *	Create a prop_bool_t and initialize it with the
    137      1.1  thorpej  *	provided boolean value.
    138      1.1  thorpej  */
    139      1.1  thorpej prop_bool_t
    140      1.1  thorpej prop_bool_create(boolean_t val)
    141      1.1  thorpej {
    142      1.1  thorpej 
    143      1.3  thorpej 	return (_prop_bool_alloc(val));
    144      1.1  thorpej }
    145      1.1  thorpej 
    146      1.1  thorpej /*
    147      1.1  thorpej  * prop_bool_copy --
    148      1.1  thorpej  *	Copy a prop_bool_t.
    149      1.1  thorpej  */
    150      1.1  thorpej prop_bool_t
    151      1.1  thorpej prop_bool_copy(prop_bool_t opb)
    152      1.1  thorpej {
    153      1.1  thorpej 
    154  1.3.2.1     tron 	if (! prop_object_is_bool(opb))
    155  1.3.2.1     tron 		return (NULL);
    156      1.1  thorpej 
    157      1.3  thorpej 	/*
    158      1.3  thorpej 	 * Because we only ever allocate one true and one false, this
    159      1.3  thorpej 	 * can be reduced to a simple retain operation.
    160      1.3  thorpej 	 */
    161      1.3  thorpej 	prop_object_retain(opb);
    162      1.3  thorpej 	return (opb);
    163      1.1  thorpej }
    164      1.1  thorpej 
    165      1.1  thorpej /*
    166      1.1  thorpej  * prop_bool_true --
    167      1.1  thorpej  *	Get the value of a prop_bool_t.
    168      1.1  thorpej  */
    169      1.1  thorpej boolean_t
    170      1.1  thorpej prop_bool_true(prop_bool_t pb)
    171      1.1  thorpej {
    172      1.1  thorpej 
    173  1.3.2.1     tron 	if (! prop_object_is_bool(pb))
    174  1.3.2.1     tron 		return (FALSE);
    175  1.3.2.1     tron 
    176      1.1  thorpej 	return (pb->pb_value);
    177      1.1  thorpej }
    178      1.1  thorpej 
    179      1.1  thorpej /*
    180      1.2  thorpej  * prop_bool_equals --
    181      1.2  thorpej  *	Return TRUE if the boolean values are equivalent.
    182      1.2  thorpej  */
    183      1.2  thorpej boolean_t
    184      1.2  thorpej prop_bool_equals(prop_bool_t b1, prop_bool_t b2)
    185      1.2  thorpej {
    186      1.2  thorpej 
    187      1.2  thorpej 	return (_prop_bool_equals(b1, b2));
    188      1.2  thorpej }
    189      1.2  thorpej 
    190      1.2  thorpej /*
    191      1.1  thorpej  * _prop_bool_internalize --
    192      1.1  thorpej  *	Parse a <true/> or <false/> and return the object created from
    193      1.1  thorpej  *	the external representation.
    194      1.1  thorpej  */
    195      1.1  thorpej prop_object_t
    196      1.1  thorpej _prop_bool_internalize(struct _prop_object_internalize_context *ctx)
    197      1.1  thorpej {
    198      1.1  thorpej 	boolean_t val;
    199      1.1  thorpej 
    200      1.1  thorpej 	/* No attributes, and it must be an empty element. */
    201      1.1  thorpej 	if (ctx->poic_tagattr != NULL ||
    202      1.1  thorpej 	    ctx->poic_is_empty_element == FALSE)
    203      1.1  thorpej 	    	return (NULL);
    204      1.1  thorpej 
    205      1.1  thorpej 	if (_PROP_TAG_MATCH(ctx, "true"))
    206      1.1  thorpej 		val = TRUE;
    207      1.1  thorpej 	else {
    208      1.1  thorpej 		_PROP_ASSERT(_PROP_TAG_MATCH(ctx, "false"));
    209      1.1  thorpej 		val = FALSE;
    210      1.1  thorpej 	}
    211      1.1  thorpej 
    212      1.1  thorpej 	return (prop_bool_create(val));
    213      1.1  thorpej }
    214