Mercurial > dovecot > original-hg > dovecot-1.2

annotate src/lib/array.h @ 3283:21f30709ead8 HEAD

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Added ARRAY_DEFINE_EXTERN().
author Timo Sirainen <tss@iki.fi>
date Fri, 08 Apr 2005 18:22:28 +0300
parents a2943c050571
children ed782bb26632
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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1 #ifndef __ARRAY_H
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2 #define __ARRAY_H
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3
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4 #include "buffer.h"
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5
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6 /* Array is a buffer accessible using fixed size elements. If DEBUG is
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7 enabled, it also provides compile time type safety:
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8
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9 If DEBUG is enabled, an extra variable is defined along with the array
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10 itself. This is used to cast array_idx() return value correctly, so
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11 compiler gives a warning if it's assigned into variable with a different
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12 type.
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13
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14 Example usage:
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15
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16 struct foo {
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17 array_t ARRAY_DEFINE(bars, struct bar);
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18 ...
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19 };
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20
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21 ARRAY_CREATE(&foo->bars, default_pool, struct bar, 10);
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22 ARRAY_CREATE(&foo->bars, default_pool, struct baz, 10); // compiler warning
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23
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24 struct bar *bar = array_idx(&foo->bars, 5);
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25 struct baz *baz = array_idx(&foo->bars, 5); // compiler warning
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26
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27 When passing array_t as a parameter to function, or when it's otherwise
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28 accessed in a way that the extra variable cannot be accessed, the code
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29 won't compile. For situations like those, there's a ARRAY_SET_TYPE() macro.
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30
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31 Example:
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32
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33 void do_foo(array_t *bars) {
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34 ARRAY_SET_TYPE(bars, struct foo);
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35 struct foo *foo = array_idx(bars, 0);
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36 }
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37 */
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38 #if defined (DEBUG) && defined (__GNUC__)
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39 # define ARRAY_TYPE_CHECKS
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40 #endif
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41
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42 #ifdef ARRAY_TYPE_CHECKS
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43 # define ARRAY_DEFINE(name, array_type) name; array_type *name ## __ ## type
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44 # define ARRAY_DEFINE_EXTERN(name, array_type) \
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45 name; extern array_type *name ## __ ## type
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46 # define ARRAY_DEFINE_PTR(name, array_type) \
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47 name; array_type **name ## __ ## type
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48 # define ARRAY_CREATE(array, pool, array_type, init_count) STMT_START { \
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49 array_type *_array_tmp = *(array ## __ ## type); _array_tmp = NULL; \
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50 array_create(array, pool, sizeof(array_type), init_count); \
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51 } STMT_END
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52 # define ARRAY_SET_TYPE(array, array_type) \
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53 array_type **array ## __ ## type = NULL
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54 # define ARRAY_INIT { 0, 0 }, 0
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55 #else
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56 # define ARRAY_DEFINE(name, array_type) name
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57 # define ARRAY_DEFINE_EXTERN(name, array_type) name
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58 # define ARRAY_DEFINE_PTR(name, array_type) name
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59 # define ARRAY_CREATE(array, pool, array_type, init_count) \
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60 array_create(array, pool, sizeof(array_type), init_count)
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61 /* The reason we do this for non-ARRAY_TYPE_CHECKS as well is because if we
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62 left this empty, some compilers wouldn't like an extra ";" character at
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63 the beginning of the function (eg. gcc 2.95).
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64
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65 However just declaring the variable gives "unused variable" warning.
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66 I couldn't think of anything better, so we just use gcc-specific
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67 unused-attribute to get rid of that with gcc. */
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68 # define ARRAY_SET_TYPE(array, array_type) \
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69 array_type **array ## __ ## type __attr_unused__ = NULL
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70 # define ARRAY_INIT { 0, 0 }
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71 #endif
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72
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73 struct array {
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74 buffer_t *buffer;
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75 size_t element_size;
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76 };
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77
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78 static inline void
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79 array_create_from_buffer(array_t *array, buffer_t *buffer, size_t element_size)
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80 {
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81 array->buffer = buffer;
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82 array->element_size = element_size;
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83 }
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84
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85 static inline void
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86 array_create(array_t *array, pool_t pool,
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87 size_t element_size, unsigned int init_count)
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88 {
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89 buffer_t *buffer;
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90
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91 buffer = buffer_create_dynamic(pool, init_count * element_size);
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92 array_create_from_buffer(array, buffer, element_size);
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93 }
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94
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95 static inline void
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96 array_free(array_t *array)
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97 {
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98 buffer_free(array->buffer);
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99 array->buffer = NULL;
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100 }
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101
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102 static inline int
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103 array_is_created(const array_t *array)
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104 {
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105 return array->buffer != NULL;
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106 }
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107
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108 static inline void
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109 array_clear(array_t *array)
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110 {
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111 buffer_set_used_size(array->buffer, 0);
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112 }
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113
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114 static inline void
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115 _array_append(array_t *array, const void *data, unsigned int count)
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116 {
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117 buffer_append(array->buffer, data, count * array->element_size);
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118 }
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119 #ifndef ARRAY_TYPE_CHECKS
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120 # define array_append _array_append
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121 #else
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122 # define array_append(array, data, count) STMT_START { \
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123 typeof(*(array ## __ ## type)) _array_tmp = data; \
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124 _array_append(array, _array_tmp, count); \
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125 } STMT_END
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126 #endif
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127
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128 static inline void
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129 array_append_array(array_t *dest_array, const array_t *src_array)
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130 {
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131 i_assert(dest_array->element_size == src_array->element_size);
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132 buffer_append_buf(dest_array->buffer, src_array->buffer, 0, (size_t)-1);
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133 }
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134
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135 static inline void
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136 _array_insert(array_t *array, unsigned int idx,
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137 const void *data, unsigned int count)
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138 {
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139 buffer_insert(array->buffer, idx * array->element_size,
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140 data, count * array->element_size);
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141 }
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142 #ifndef ARRAY_TYPE_CHECKS
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143 # define array_insert _array_insert
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144 #else
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145 # define array_insert(array, idx, data, count) STMT_START { \
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146 typeof(*(array ## __ ## type)) _array_tmp = data; \
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147 _array_insert(array, idx, _array_tmp, count); \
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148 } STMT_END
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149 #endif
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150
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151 static inline void
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152 array_delete(array_t *array, unsigned int idx, unsigned int count)
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153 {
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154 buffer_delete(array->buffer, idx * array->element_size,
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155 count * array->element_size);
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156 }
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157
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158 static inline const void *
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159 _array_get(const array_t *array, unsigned int *count_r)
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160 {
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161 if (count_r != NULL)
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162 *count_r = array->buffer->used / array->element_size;
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163 return array->buffer->data;
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164 }
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165 #ifndef ARRAY_TYPE_CHECKS
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166 # define array_get _array_get
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167 #else
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168 # define array_get(array, count) \
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169 (const typeof(*(array ## __ ## type)))_array_get(array, count)
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170 #endif
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171
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172 static inline const void *
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173 _array_idx(const array_t *array, unsigned int idx)
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174 {
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175 i_assert(idx * array->element_size < array->buffer->used);
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176 return CONST_PTR_OFFSET(array->buffer->data, idx * array->element_size);
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177 }
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178 #ifndef ARRAY_TYPE_CHECKS
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179 # define array_idx _array_idx
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180 #else
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181 # define array_idx(array, idx) \
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182 (const typeof(*(array ## __ ## type)))_array_idx(array, idx)
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183 #endif
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184
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185 static inline void *
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186 _array_get_modifyable(array_t *array, unsigned int *count_r)
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187 {
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188 if (count_r != NULL)
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189 *count_r = array->buffer->used / array->element_size;
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190 return buffer_get_modifyable_data(array->buffer, NULL);
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191 }
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192 #ifndef ARRAY_TYPE_CHECKS
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193 # define array_get_modifyable _array_get_modifyable
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194 #else
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195 # define array_get_modifyable(array, count) \
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196 (typeof(*(array ## __ ## type))) \
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197 _array_get_modifyable(array, count)
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198 #endif
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199
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200 static inline void *
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201 _array_modifyable_idx(array_t *array, unsigned int idx)
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202 {
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203 size_t pos;
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204
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205 pos = idx * array->element_size;
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206 if (pos >= array->buffer->used) {
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207 /* index doesn't exist yet, initialize with zero */
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208 buffer_append_zero(array->buffer, pos + array->element_size -
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209 array->buffer->used);
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210 }
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211 return buffer_get_space_unsafe(array->buffer, pos, array->element_size);
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212 }
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213 #ifndef ARRAY_TYPE_CHECKS
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214 # define array_modifyable_idx _array_modifyable_idx
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215 #else
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216 # define array_modifyable_idx(array, count) \
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217 (typeof(*(array ## __ ## type))) \
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218 _array_modifyable_idx(array, count)
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219 #endif
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220
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221 static inline void
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222 _array_idx_set(array_t *array, unsigned int idx, const void *data)
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223 {
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224 size_t pos;
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225
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226 pos = idx * array->element_size;
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227 if (pos > array->buffer->used) {
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228 /* index doesn't exist yet, initialize with zero */
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229 buffer_append_zero(array->buffer, pos - array->buffer->used);
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230 }
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231 buffer_write(array->buffer, pos, data, array->element_size);
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232 }
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233 #ifndef ARRAY_TYPE_CHECKS
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234 # define array_idx_set _array_idx_set
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235 #else
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236 # define array_idx_set(array, idx, data) STMT_START { \
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237 typeof(*(array ## __ ## type)) _array_tmp = data; \
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238 _array_idx_set(array, idx, _array_tmp); \
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239 } STMT_END
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240 #endif
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241
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242 static inline void *
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243 _array_modifyable_append(array_t *array)
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244 {
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245 void *data;
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246
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247 data = buffer_append_space_unsafe(array->buffer, array->element_size);
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248 memset(data, 0, array->element_size);
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249 return data;
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250 }
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251 #ifndef ARRAY_TYPE_CHECKS
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252 # define array_modifyable_append _array_modifyable_append
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253 #else
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254 # define array_modifyable_append(array) \
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255 (typeof(*(array ## __ ## type))) \
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256 _array_modifyable_append(array)
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257 #endif
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258
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259 static inline void *
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260 _array_modifyable_insert(array_t *array, unsigned int idx)
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261 {
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262 void *data;
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263 size_t pos;
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264
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265 pos = idx * array->element_size;
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266 buffer_copy(array->buffer, pos + array->element_size,
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267 array->buffer, pos, (size_t)-1);
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268
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269 data = buffer_get_space_unsafe(array->buffer, pos, array->element_size);
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270 memset(data, 0, array->element_size);
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271 return data;
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272 }
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273 #ifndef ARRAY_TYPE_CHECKS
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274 # define array_modifyable_insert _array_modifyable_insert
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275 #else
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276 # define array_modifyable_insert(array, idx) \
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277 (typeof(*(array ## __ ## type))) \
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278 _array_modifyable_insert(array, idx)
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279 #endif
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280
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281 static inline unsigned int
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282 array_count(const array_t *array)
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283 {
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284 return array->buffer->used / array->element_size;
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285 }
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286
3254
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287 static inline int
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288 array_cmp(const array_t *array1, const array_t *array2)
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289 {
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290 if (!array_is_created(array1) || array1->buffer->used == 0)
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291 return !array_is_created(array2) || array2->buffer->used == 0;
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292
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293 if (!array_is_created(array2))
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294 return FALSE;
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295
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296 return buffer_cmp(array1->buffer, array2->buffer);
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297 }
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298
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299 #endif