prop_bool.c revision 1.6
1 /* $NetBSD: prop_bool.c,v 1.6 2006/10/03 15:45:04 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 boolean_t 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 boolean_t _prop_bool_initialized; 52 53 static void _prop_bool_free(void *); 54 static boolean_t _prop_bool_externalize( 55 struct _prop_object_externalize_context *, 56 void *); 57 static boolean_t _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 _prop_bool_free(void *v) 71 { 72 73 /* 74 * This should never happen as we "leak" our initial reference 75 * count. 76 */ 77 /* XXX forced assertion failure? */ 78 } 79 80 static boolean_t 81 _prop_bool_externalize(struct _prop_object_externalize_context *ctx, 82 void *v) 83 { 84 prop_bool_t pb = v; 85 86 return (_prop_object_externalize_empty_tag(ctx, 87 pb->pb_value ? "true" : "false")); 88 } 89 90 static boolean_t 91 _prop_bool_equals(void *v1, void *v2) 92 { 93 prop_bool_t b1 = v1; 94 prop_bool_t b2 = v2; 95 96 if (! (prop_object_is_bool(b1) && 97 prop_object_is_bool(b2))) 98 return (FALSE); 99 100 /* 101 * Since we only ever allocate one true and one false, 102 * save ourselves a couple of memory operations. 103 */ 104 return (b1 == b2); 105 } 106 107 static prop_bool_t 108 _prop_bool_alloc(boolean_t val) 109 { 110 prop_bool_t pb; 111 112 if (! _prop_bool_initialized) { 113 _PROP_MUTEX_LOCK(_prop_bool_initialized_mutex); 114 if (! _prop_bool_initialized) { 115 _prop_object_init(&_prop_bool_true.pb_obj, 116 &_prop_object_type_bool); 117 _prop_bool_true.pb_value = TRUE; 118 119 _prop_object_init(&_prop_bool_false.pb_obj, 120 &_prop_object_type_bool); 121 _prop_bool_false.pb_value = FALSE; 122 123 _prop_bool_initialized = TRUE; 124 } 125 _PROP_MUTEX_UNLOCK(_prop_bool_initialized_mutex); 126 } 127 128 pb = val ? &_prop_bool_true : &_prop_bool_false; 129 prop_object_retain(pb); 130 131 return (pb); 132 } 133 134 /* 135 * prop_bool_create -- 136 * Create a prop_bool_t and initialize it with the 137 * provided boolean value. 138 */ 139 prop_bool_t 140 prop_bool_create(boolean_t val) 141 { 142 143 return (_prop_bool_alloc(val)); 144 } 145 146 /* 147 * prop_bool_copy -- 148 * Copy a prop_bool_t. 149 */ 150 prop_bool_t 151 prop_bool_copy(prop_bool_t opb) 152 { 153 154 if (! prop_object_is_bool(opb)) 155 return (NULL); 156 157 /* 158 * Because we only ever allocate one true and one false, this 159 * can be reduced to a simple retain operation. 160 */ 161 prop_object_retain(opb); 162 return (opb); 163 } 164 165 /* 166 * prop_bool_true -- 167 * Get the value of a prop_bool_t. 168 */ 169 boolean_t 170 prop_bool_true(prop_bool_t pb) 171 { 172 173 if (! prop_object_is_bool(pb)) 174 return (FALSE); 175 176 return (pb->pb_value); 177 } 178 179 /* 180 * prop_bool_equals -- 181 * Return TRUE if the boolean values are equivalent. 182 */ 183 boolean_t 184 prop_bool_equals(prop_bool_t b1, prop_bool_t b2) 185 { 186 187 return (_prop_bool_equals(b1, b2)); 188 } 189 190 /* 191 * _prop_bool_internalize -- 192 * Parse a <true/> or <false/> and return the object created from 193 * the external representation. 194 */ 195 prop_object_t 196 _prop_bool_internalize(struct _prop_object_internalize_context *ctx) 197 { 198 boolean_t val; 199 200 /* No attributes, and it must be an empty element. */ 201 if (ctx->poic_tagattr != NULL || 202 ctx->poic_is_empty_element == FALSE) 203 return (NULL); 204 205 if (_PROP_TAG_MATCH(ctx, "true")) 206 val = TRUE; 207 else { 208 _PROP_ASSERT(_PROP_TAG_MATCH(ctx, "false")); 209 val = FALSE; 210 } 211 212 return (prop_bool_create(val)); 213 } 214
Indexes created Wed Sep 24 05:09:52 GMT 2025