prop_bool.c revision 1.10
1 /* $NetBSD: prop_bool.c,v 1.10 2007/08/16 16:28:17 thorpej Exp $ */ 2 3 /*- 4 * Copyright (c) 2006 The NetBSD Foundation, Inc. 5 * All rights reserved. 6 * 7 * This code is derived from software contributed to The NetBSD Foundation 8 * by Jason R. Thorpe. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. All advertising materials mentioning features or use of this software 19 * must display the following acknowledgement: 20 * This product includes software developed by the NetBSD 21 * Foundation, Inc. and its contributors. 22 * 4. Neither the name of The NetBSD Foundation nor the names of its 23 * contributors may be used to endorse or promote products derived 24 * from this software without specific prior written permission. 25 * 26 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 27 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 28 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 29 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 30 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 31 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 32 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 33 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 34 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 35 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 36 * POSSIBILITY OF SUCH DAMAGE. 37 */ 38 39 #include <prop/prop_bool.h> 40 #include "prop_object_impl.h" 41 42 struct _prop_bool { 43 struct _prop_object pb_obj; 44 bool pb_value; 45 }; 46 47 static struct _prop_bool _prop_bool_true; 48 static struct _prop_bool _prop_bool_false; 49 50 _PROP_MUTEX_DECL_STATIC(_prop_bool_initialized_mutex) 51 static bool _prop_bool_initialized; 52 53 static void _prop_bool_free(void *); 54 static bool _prop_bool_externalize( 55 struct _prop_object_externalize_context *, 56 void *); 57 static bool _prop_bool_equals(void *, void *); 58 59 static const struct _prop_object_type _prop_object_type_bool = { 60 .pot_type = PROP_TYPE_BOOL, 61 .pot_free = _prop_bool_free, 62 .pot_extern = _prop_bool_externalize, 63 .pot_equals = _prop_bool_equals, 64 }; 65 66 #define prop_object_is_bool(x) \ 67 ((x) != NULL && (x)->pb_obj.po_type == &_prop_object_type_bool) 68 69 static void 70 /*ARGSUSED*/ 71 _prop_bool_free(void *v _PROP_ARG_UNUSED) 72 { 73 74 /* 75 * This should never happen as we "leak" our initial reference 76 * count. 77 */ 78 /* XXX forced assertion failure? */ 79 } 80 81 static bool 82 _prop_bool_externalize(struct _prop_object_externalize_context *ctx, 83 void *v) 84 { 85 prop_bool_t pb = v; 86 87 return (_prop_object_externalize_empty_tag(ctx, 88 pb->pb_value ? "true" : "false")); 89 } 90 91 static bool 92 _prop_bool_equals(void *v1, void *v2) 93 { 94 prop_bool_t b1 = v1; 95 prop_bool_t b2 = v2; 96 97 if (! (prop_object_is_bool(b1) && 98 prop_object_is_bool(b2))) 99 return (false); 100 101 /* 102 * Since we only ever allocate one true and one false, 103 * save ourselves a couple of memory operations. 104 */ 105 return (b1 == b2); 106 } 107 108 static prop_bool_t 109 _prop_bool_alloc(bool val) 110 { 111 prop_bool_t pb; 112 113 if (! _prop_bool_initialized) { 114 _PROP_MUTEX_LOCK(_prop_bool_initialized_mutex); 115 if (! _prop_bool_initialized) { 116 _prop_object_init(&_prop_bool_true.pb_obj, 117 &_prop_object_type_bool); 118 _prop_bool_true.pb_value = true; 119 120 _prop_object_init(&_prop_bool_false.pb_obj, 121 &_prop_object_type_bool); 122 _prop_bool_false.pb_value = false; 123 124 _prop_bool_initialized = true; 125 } 126 _PROP_MUTEX_UNLOCK(_prop_bool_initialized_mutex); 127 } 128 129 pb = val ? &_prop_bool_true : &_prop_bool_false; 130 prop_object_retain(pb); 131 132 return (pb); 133 } 134 135 /* 136 * prop_bool_create -- 137 * Create a prop_bool_t and initialize it with the 138 * provided boolean value. 139 */ 140 prop_bool_t 141 prop_bool_create(bool val) 142 { 143 144 return (_prop_bool_alloc(val)); 145 } 146 147 /* 148 * prop_bool_copy -- 149 * Copy a prop_bool_t. 150 */ 151 prop_bool_t 152 prop_bool_copy(prop_bool_t opb) 153 { 154 155 if (! prop_object_is_bool(opb)) 156 return (NULL); 157 158 /* 159 * Because we only ever allocate one true and one false, this 160 * can be reduced to a simple retain operation. 161 */ 162 prop_object_retain(opb); 163 return (opb); 164 } 165 166 /* 167 * prop_bool_true -- 168 * Get the value of a prop_bool_t. 169 */ 170 bool 171 prop_bool_true(prop_bool_t pb) 172 { 173 174 if (! prop_object_is_bool(pb)) 175 return (false); 176 177 return (pb->pb_value); 178 } 179 180 /* 181 * prop_bool_equals -- 182 * Return true if the boolean values are equivalent. 183 */ 184 bool 185 prop_bool_equals(prop_bool_t b1, prop_bool_t b2) 186 { 187 188 return (_prop_bool_equals(b1, b2)); 189 } 190 191 /* 192 * _prop_bool_internalize -- 193 * Parse a <true/> or <false/> and return the object created from 194 * the external representation. 195 */ 196 prop_object_t 197 _prop_bool_internalize(struct _prop_object_internalize_context *ctx) 198 { 199 bool val; 200 201 /* No attributes, and it must be an empty element. */ 202 if (ctx->poic_tagattr != NULL || 203 ctx->poic_is_empty_element == false) 204 return (NULL); 205 206 if (_PROP_TAG_MATCH(ctx, "true")) 207 val = true; 208 else { 209 _PROP_ASSERT(_PROP_TAG_MATCH(ctx, "false")); 210 val = false; 211 } 212 213 return (prop_bool_create(val)); 214 } 215
Indexes created Tue Sep 23 02:09:52 GMT 2025