prop_bool.c revision 1.15.2.1
1 /* $NetBSD: prop_bool.c,v 1.15.2.1 2008/09/18 04:54:18 wrstuden 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 * 19 * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 * POSSIBILITY OF SUCH DAMAGE. 30 */ 31 32 #include <prop/prop_bool.h> 33 #include "prop_object_impl.h" 34 35 struct _prop_bool { 36 struct _prop_object pb_obj; 37 bool pb_value; 38 }; 39 40 static struct _prop_bool _prop_bool_true; 41 static struct _prop_bool _prop_bool_false; 42 43 _PROP_MUTEX_DECL_STATIC(_prop_bool_initialized_mutex) 44 static bool _prop_bool_initialized; 45 46 static _prop_object_free_rv_t 47 _prop_bool_free(prop_stack_t, prop_object_t *); 48 static bool _prop_bool_externalize( 49 struct _prop_object_externalize_context *, 50 void *); 51 static _prop_object_equals_rv_t 52 _prop_bool_equals(prop_object_t, prop_object_t, 53 void **, void **, 54 prop_object_t *, prop_object_t *); 55 56 static const struct _prop_object_type _prop_object_type_bool = { 57 .pot_type = PROP_TYPE_BOOL, 58 .pot_free = _prop_bool_free, 59 .pot_extern = _prop_bool_externalize, 60 .pot_equals = _prop_bool_equals, 61 }; 62 63 #define prop_object_is_bool(x) \ 64 ((x) != NULL && (x)->pb_obj.po_type == &_prop_object_type_bool) 65 66 /* ARGSUSED */ 67 static _prop_object_free_rv_t 68 _prop_bool_free(prop_stack_t stack, prop_object_t *obj) 69 { 70 /* 71 * This should never happen as we "leak" our initial reference 72 * count. 73 */ 74 75 /* XXX forced assertion failure? */ 76 return (_PROP_OBJECT_FREE_DONE); 77 } 78 79 static bool 80 _prop_bool_externalize(struct _prop_object_externalize_context *ctx, 81 void *v) 82 { 83 prop_bool_t pb = v; 84 85 return (_prop_object_externalize_empty_tag(ctx, 86 pb->pb_value ? "true" : "false")); 87 } 88 89 /* ARGSUSED */ 90 static _prop_object_equals_rv_t 91 _prop_bool_equals(prop_object_t v1, prop_object_t v2, 92 void **stored_pointer1, void **stored_pointer2, 93 prop_object_t *next_obj1, prop_object_t *next_obj2) 94 { 95 prop_bool_t b1 = v1; 96 prop_bool_t b2 = v2; 97 98 if (! (prop_object_is_bool(b1) && 99 prop_object_is_bool(b2))) 100 return (_PROP_OBJECT_EQUALS_FALSE); 101 102 /* 103 * Since we only ever allocate one true and one false, 104 * save ourselves a couple of memory operations. 105 */ 106 if (b1 == b2) 107 return (_PROP_OBJECT_EQUALS_TRUE); 108 else 109 return (_PROP_OBJECT_EQUALS_FALSE); 110 } 111 112 static prop_bool_t 113 _prop_bool_alloc(bool val) 114 { 115 prop_bool_t pb; 116 117 if (! _prop_bool_initialized) { 118 _PROP_MUTEX_LOCK(_prop_bool_initialized_mutex); 119 if (! _prop_bool_initialized) { 120 _prop_object_init(&_prop_bool_true.pb_obj, 121 &_prop_object_type_bool); 122 _prop_bool_true.pb_value = true; 123 124 _prop_object_init(&_prop_bool_false.pb_obj, 125 &_prop_object_type_bool); 126 _prop_bool_false.pb_value = false; 127 128 _prop_bool_initialized = true; 129 } 130 _PROP_MUTEX_UNLOCK(_prop_bool_initialized_mutex); 131 } 132 133 pb = val ? &_prop_bool_true : &_prop_bool_false; 134 prop_object_retain(pb); 135 136 return (pb); 137 } 138 139 /* 140 * prop_bool_create -- 141 * Create a prop_bool_t and initialize it with the 142 * provided boolean value. 143 */ 144 prop_bool_t 145 prop_bool_create(bool val) 146 { 147 148 return (_prop_bool_alloc(val)); 149 } 150 151 /* 152 * prop_bool_copy -- 153 * Copy a prop_bool_t. 154 */ 155 prop_bool_t 156 prop_bool_copy(prop_bool_t opb) 157 { 158 159 if (! prop_object_is_bool(opb)) 160 return (NULL); 161 162 /* 163 * Because we only ever allocate one true and one false, this 164 * can be reduced to a simple retain operation. 165 */ 166 prop_object_retain(opb); 167 return (opb); 168 } 169 170 /* 171 * prop_bool_true -- 172 * Get the value of a prop_bool_t. 173 */ 174 bool 175 prop_bool_true(prop_bool_t pb) 176 { 177 178 if (! prop_object_is_bool(pb)) 179 return (false); 180 181 return (pb->pb_value); 182 } 183 184 /* 185 * prop_bool_equals -- 186 * Return true if the boolean values are equivalent. 187 */ 188 bool 189 prop_bool_equals(prop_bool_t b1, prop_bool_t b2) 190 { 191 if (!prop_object_is_bool(b1) || !prop_object_is_bool(b2)) 192 return (false); 193 194 return (prop_object_equals(b1, b2)); 195 } 196 197 /* 198 * _prop_bool_internalize -- 199 * Parse a <true/> or <false/> and return the object created from 200 * the external representation. 201 */ 202 203 /* ARGSUSED */ 204 bool 205 _prop_bool_internalize(prop_stack_t stack, prop_object_t *obj, 206 struct _prop_object_internalize_context *ctx) 207 { 208 bool val; 209 210 /* No attributes, and it must be an empty element. */ 211 if (ctx->poic_tagattr != NULL || 212 ctx->poic_is_empty_element == false) 213 return (true); 214 215 if (_PROP_TAG_MATCH(ctx, "true")) 216 val = true; 217 else { 218 _PROP_ASSERT(_PROP_TAG_MATCH(ctx, "false")); 219 val = false; 220 } 221 *obj = prop_bool_create(val); 222 return (true); 223 } 224
Indexes created Tue Sep 30 17:09:57 GMT 2025