Mercurial > code
annotate array.c @ 26:4fd9ecbbb143
Code cosmetic
author | David Demelier <markand@malikania.fr> |
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date | Sun, 18 Sep 2011 14:09:37 +0200 |
parents | e09000fc013a |
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1 /* |
14 | 2 * array.c -- manipulate dynamic arrays |
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3 * |
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4 * Copyright (c) 2011, David Demelier <markand@malikania.fr> |
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5 * |
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6 * Permission to use, copy, modify, and/or distribute this software for any |
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7 * purpose with or without fee is hereby granted, provided that the above |
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8 * copyright notice and this permission notice appear in all copies. |
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9 * |
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10 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES |
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11 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF |
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12 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR |
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13 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES |
9 | 14 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN |
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15 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF |
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16 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. |
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17 */ |
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18 |
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19 #include <stdio.h> |
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20 #include <stdlib.h> |
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21 #include <string.h> |
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22 |
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23 #include "array.h" |
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24 |
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25 #define SIZE(x) (arr->unit * (x)) |
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26 |
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27 static int array_grow(struct array *); |
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28 |
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29 struct array * |
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30 array_new(const void *data, size_t unit, size_t bsize, int flags) |
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31 { |
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32 struct array *arr; |
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33 |
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34 if (unit == 0 || !(arr = malloc(sizeof (struct array)))) |
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35 return NULL; |
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36 |
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37 arr->tmp = NULL; |
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38 arr->length = 0; |
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39 arr->flags = flags; |
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40 arr->bsize = (bsize == 0) ? ARRAY_DEFAULT_BSIZE : bsize; |
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41 arr->unit = unit; |
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42 arr->size = SIZE(arr->bsize); |
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43 |
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44 if (!(arr->data = malloc(arr->size))) { |
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45 free(arr); |
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46 return NULL; |
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47 } |
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48 |
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49 if (data) |
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50 memcpy(arr->data, data, arr->unit); |
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51 |
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52 return arr; |
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53 } |
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54 |
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55 /* |
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56 * Add to the head of array. NOTE: this may be very slow when adding a lot |
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57 * of object (about 100000). If you need to add a lot of data please consider |
26 | 58 * using linked list instead. |
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59 */ |
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60 |
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61 int |
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62 array_push(struct array *arr, const void *data) |
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63 { |
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64 if (array_grow(arr) < 0) |
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65 return -1; |
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66 |
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67 memmove((char *) arr->data + arr->unit, arr->data, SIZE(arr->length++)); |
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68 memcpy((char *) arr->data, data, arr->unit); |
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69 |
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70 return 0; |
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71 } |
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72 |
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73 /* |
26 | 74 * Insert the data at the specified index. The function returns -1 on |
75 * allocation failure or when the index is outof bounds otherwise 0 is returned. | |
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76 */ |
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77 |
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78 int |
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79 array_insert(struct array *arr, const void *data, int index) |
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80 { |
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81 if (index > arr->length - 1 || index < 0 || array_grow(arr) < 0) |
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82 return -1; |
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83 |
26 | 84 memmove((char *) arr->data + SIZE(index + 1), |
85 (char *) arr->data + SIZE(index), SIZE(arr->length++ - index)); | |
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86 memcpy((char *) arr->data + SIZE(index), data, arr->unit); |
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87 |
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88 return 0; |
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89 } |
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90 |
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91 /* |
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92 * Append the data to the end of array. |
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93 */ |
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94 |
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95 int |
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96 array_append(struct array *arr, const void *data) |
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97 { |
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98 if (array_grow(arr) < 0) |
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99 return -1; |
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100 |
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101 memcpy((char *) arr->data + SIZE(arr->length++), data, arr->unit); |
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102 |
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103 return 0; |
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104 } |
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105 |
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106 /* |
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107 * Remove the array's head and return the object or NULL if |
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108 * the array is empty. |
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109 */ |
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110 |
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111 void * |
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112 array_pop(struct array *arr) |
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113 { |
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114 void *data; |
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115 |
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116 if (arr->length == 0) |
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117 return NULL; |
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118 |
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119 data = arr->data; |
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120 memmove((char *) arr->data, (char *) arr->data + SIZE(1), |
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121 SIZE(arr->length)); |
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122 memset((char *) arr->data + SIZE(--arr->length), 0, arr->unit); |
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123 |
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124 return data; |
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125 } |
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126 |
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127 /* |
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128 * Remove the array's queue and return the object or NULL |
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129 * if the array is empty. |
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130 */ |
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131 |
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132 void * |
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133 array_unqueue(struct array *arr) |
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134 { |
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135 void *data; |
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136 |
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137 if (arr->length == 0) |
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138 return NULL; |
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139 |
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140 data = (char *) arr->data + SIZE(--arr->length); |
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141 memset((char *) arr->data + SIZE(arr->length), 0, arr->unit); |
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142 |
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143 return data; |
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144 } |
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145 |
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146 /* |
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147 * Remove the entry at the specified index and return it. If the index is out of |
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148 * bounds or the list is empty the functions returns NULL. |
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149 */ |
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150 |
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151 void * |
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152 array_remove(struct array *arr, int index) |
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153 { |
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154 void *data; |
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155 |
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156 if (arr->length == 0 || index < 0 || index > arr->length - 1) |
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157 return NULL; |
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158 |
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159 data = (char *) arr->data + SIZE(index); |
26 | 160 memmove((char *) arr->data + SIZE(index), |
161 (char *) arr->data + SIZE(index + 1), SIZE(arr->length - index)); | |
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162 memset((char *) arr->data + SIZE(--arr->length), 0, arr->unit); |
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163 |
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164 return data; |
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165 } |
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166 |
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167 /* |
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168 * Swap the two elements referenced by index `i1' and `i2'. This function needs |
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169 * to allocate data to swap elements thus if the functions fails it returns -1 |
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170 * otherwise 0 is returned. |
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171 */ |
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172 |
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173 int |
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174 array_swap(struct array *arr, int i1, int i2) |
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175 { |
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176 /* Out of bounds */ |
26 | 177 if (i1 > arr->length - 1|| i1 < 0 || i2 > arr->length - 1 || i2 < 0) |
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178 return -1; |
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179 |
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180 /* |
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181 * Only allocate at this time, the user may do not want to use this |
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182 * function. |
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183 */ |
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184 |
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185 if (!arr->tmp && !(arr->tmp = malloc(arr->unit))) |
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186 return -1; |
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187 |
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188 memcpy((char *) arr->tmp, (char *) arr->data + SIZE(i1), arr->unit); |
26 | 189 memcpy((char *) arr->data + SIZE(i1), (char *) arr->data + SIZE(i2), |
190 arr->unit); | |
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191 memcpy((char *) arr->data + SIZE(i2), (char *) arr->tmp, arr->unit); |
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192 |
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193 return 0; |
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194 } |
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195 |
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196 /* |
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197 * Apply the function `fn' on each object and give the optional `udata' |
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198 * argument to the function too. |
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199 */ |
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200 |
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201 void |
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202 array_map(struct array *arr, void (*fn)(void *, void *), void *udata) |
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203 { |
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204 int i; |
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205 |
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206 for (i = 0; i < arr->length; ++i) |
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207 fn((char *) arr->data + SIZE(i), udata); |
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208 } |
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209 |
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210 /* |
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211 * Compare each object with the user supplied function. If the `fn' function |
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212 * returns 1 then the data is returned. Optional idx argument can be set to |
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213 * indicate the data position. If the data was not found the function returns |
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214 * NULL. |
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215 */ |
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216 |
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217 void * |
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218 array_find(struct array *arr, int (*fn)(void *, void *), int *idx, void *udata) |
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219 { |
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220 int st, i; |
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221 void *data; |
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222 |
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223 for (i = st = 0; i < arr->length && !st; ++i) |
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224 st = fn((char *) arr->data + SIZE(i), udata); |
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225 |
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226 if (st) { |
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227 data = (char *) arr->data + SIZE(--i); |
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228 if (idx) |
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229 *idx = i; |
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230 } else |
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231 data = NULL; |
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232 |
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233 return data; |
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234 } |
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235 |
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236 /* |
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237 * Reset the array, if the trash argument is set it will free the object |
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238 * too, otherwise the array is just truncated to 0 length. |
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239 */ |
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240 |
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241 void |
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242 array_clear(struct array *arr) |
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243 { |
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244 memset(arr->data, 0, arr->size); |
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245 arr->length = 0; |
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246 } |
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247 |
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248 /* |
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249 * Same as array_clear except it also free the array object. |
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250 */ |
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251 |
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252 void |
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253 array_free(struct array *arr) |
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254 { |
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255 array_clear(arr); |
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256 |
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257 if (arr->data) |
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258 free(arr->data); |
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259 if (arr->tmp) |
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260 free(arr->tmp); |
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261 |
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262 free(arr); |
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263 } |
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264 |
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265 /* |
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266 * Increate the array storage when it is full. If the buffer is fixed size |
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267 * it returns -1 on full buffer otherwise 0 is returned if allocation |
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268 * succeeded. |
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269 */ |
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270 |
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271 static int |
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272 array_grow(struct array *arr) |
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273 { |
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274 if ((arr->size / arr->unit) > (size_t) arr->length) |
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275 return 0; |
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276 |
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277 if (arr->flags & ARRAY_AUTO) { |
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278 if (!(arr->data = realloc(arr->data, arr->size + |
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279 SIZE(arr->bsize)))) |
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280 return -1; |
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281 |
10 | 282 arr->size += SIZE(arr->bsize); |
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283 } else |
26 | 284 return (arr->size / arr->unit <= (size_t) arr->length) ? -1 : 0; |
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285 |
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286 return 0; |
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287 } |