Mercurial > repos > blastem
annotate tern.c @ 914:28ec32e720b2
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author | Michael Pavone <pavone@retrodev.com> |
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date | Mon, 14 Dec 2015 19:36:01 -0800 |
parents | 724bbec47f86 |
children | 110251ea369e |
rev | line source |
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1 /* |
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2 Copyright 2013 Michael Pavone |
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3 This file is part of BlastEm. |
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4 BlastEm is free software distributed under the terms of the GNU General Public License version 3 or greater. See COPYING for full license text. |
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5 */ |
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6 #include "tern.h" |
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7 #include <stddef.h> |
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8 #include <stdlib.h> |
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9 #include <string.h> |
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10 #include <stdio.h> |
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11 #include "util.h" |
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12 |
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13 tern_node * tern_insert(tern_node * head, char * key, tern_val value) |
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14 { |
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15 tern_node ** cur = &head; |
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16 while(*key) |
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17 { |
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18 if (*cur) { |
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19 while(*cur && (*cur)->el != *key) |
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20 { |
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21 if (*key < (*cur)->el) { |
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22 cur = &(*cur)->left; |
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23 } else { |
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24 cur = &(*cur)->right; |
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25 } |
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26 } |
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27 } |
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28 if (!*cur) { |
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29 *cur = malloc(sizeof(tern_node)); |
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30 (*cur)->left = NULL; |
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31 (*cur)->right = NULL; |
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32 (*cur)->straight.next = NULL; |
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33 (*cur)->el = *key; |
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34 } |
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35 cur = &((*cur)->straight.next); |
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36 key++; |
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37 } |
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38 while(*cur && (*cur)->el) |
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39 { |
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40 cur = &(*cur)->left; |
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41 } |
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42 if (!*cur) { |
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43 *cur = malloc(sizeof(tern_node)); |
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44 (*cur)->left = NULL; |
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45 (*cur)->right = NULL; |
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46 (*cur)->el = 0; |
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47 } |
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48 (*cur)->straight.value = value; |
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49 return head; |
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50 } |
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51 |
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52 int tern_find(tern_node * head, char * key, tern_val *ret) |
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53 { |
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54 tern_node * cur = head; |
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55 while (cur) |
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56 { |
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57 if (cur->el == *key) { |
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58 if (*key) { |
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59 cur = cur->straight.next; |
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60 key++; |
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61 } else { |
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62 *ret = cur->straight.value; |
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63 return 1; |
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64 } |
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65 } else if (*key < cur->el) { |
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66 cur = cur->left; |
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67 } else { |
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68 cur = cur->right; |
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69 } |
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70 } |
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71 return 0; |
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72 } |
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73 |
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74 tern_node * tern_find_prefix(tern_node * head, char * key) |
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75 { |
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76 tern_node * cur = head; |
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77 while (cur && *key) |
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78 { |
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79 if (cur->el == *key) { |
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80 cur = cur->straight.next; |
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81 key++; |
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82 } else if (*key < cur->el) { |
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83 cur = cur->left; |
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84 } else { |
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85 cur = cur->right; |
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86 } |
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87 } |
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88 return cur; |
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89 } |
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90 |
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91 intptr_t tern_find_int(tern_node * head, char * key, intptr_t def) |
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92 { |
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93 tern_val ret; |
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94 if (tern_find(head, key, &ret)) { |
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95 return ret.intval; |
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96 } |
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97 return def; |
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98 } |
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99 |
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100 tern_node * tern_insert_int(tern_node * head, char * key, intptr_t value) |
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101 { |
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102 tern_val val; |
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103 val.intval = value; |
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104 return tern_insert(head, key, val); |
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105 } |
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106 |
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107 void * tern_find_ptr_default(tern_node * head, char * key, void * def) |
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108 { |
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109 tern_val ret; |
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110 if (tern_find(head, key, &ret)) { |
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111 if (ret.intval & 1) { |
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112 return (void *)(ret.intval & ~1); |
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113 } else { |
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114 return ret.ptrval; |
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115 } |
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116 } |
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117 return def; |
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118 } |
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119 |
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120 void * tern_find_ptr(tern_node * head, char * key) |
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121 { |
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122 return tern_find_ptr_default(head, key, NULL); |
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123 } |
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124 |
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125 tern_val tern_find_path_default(tern_node *head, char *key, tern_val def) |
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126 { |
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127 tern_val ret; |
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128 while (*key) |
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129 { |
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130 if (!tern_find(head, key, &ret)) { |
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131 return def; |
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132 } |
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133 key = key + strlen(key) + 1; |
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134 if (*key) { |
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135 head = tern_get_node(ret); |
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136 if (!head) { |
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137 return def; |
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138 } |
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139 } |
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140 } |
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141 return ret; |
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142 } |
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143 |
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144 tern_val tern_find_path(tern_node *head, char *key) |
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145 { |
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146 tern_val def; |
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147 def.ptrval = NULL; |
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148 return tern_find_path_default(head, key, def); |
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149 } |
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150 |
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151 tern_node * tern_insert_ptr(tern_node * head, char * key, void * value) |
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152 { |
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153 tern_val val; |
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154 val.ptrval = value; |
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155 return tern_insert(head, key, val); |
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156 } |
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157 |
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158 tern_node * tern_insert_node(tern_node *head, char *key, tern_node *value) |
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159 { |
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160 tern_val val; |
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161 val.intval = ((intptr_t)value) | 1; |
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162 return tern_insert(head, key, val); |
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163 } |
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164 |
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165 uint32_t tern_count(tern_node *head) |
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166 { |
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167 uint32_t count = 0; |
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168 if (head->left) { |
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169 count += tern_count(head->left); |
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170 } |
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171 if (head->right) { |
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172 count += tern_count(head->right); |
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173 } |
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174 if (!head->el) { |
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175 count++; |
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176 } else if (head->straight.next) { |
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177 count += tern_count(head->straight.next); |
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178 } |
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179 return count; |
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180 } |
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181 |
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182 #define MAX_ITER_KEY 127 |
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183 void tern_foreach_int(tern_node *head, iter_fun fun, void *data, char *keybuf, int pos) |
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184 { |
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185 if (!head->el) { |
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186 keybuf[pos] = 0; |
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187 fun(keybuf, head->straight.value, data); |
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188 } |
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189 if (head->left) { |
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190 tern_foreach_int(head->left, fun, data, keybuf, pos); |
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191 } |
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192 if (head->el) { |
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193 if (pos == MAX_ITER_KEY) { |
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194 fatal_error("tern_foreach_int: exceeded maximum key size"); |
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195 } |
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196 keybuf[pos] = head->el; |
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197 tern_foreach_int(head->straight.next, fun, data, keybuf, pos+1); |
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198 } |
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199 if (head->right) { |
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200 tern_foreach_int(head->right, fun, data, keybuf, pos); |
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201 } |
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202 } |
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203 |
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204 void tern_foreach(tern_node *head, iter_fun fun, void *data) |
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205 { |
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206 //lame, but good enough for my purposes |
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207 char key[MAX_ITER_KEY+1]; |
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208 tern_foreach_int(head, fun, data, key, 0); |
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209 } |
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210 |
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211 char * tern_int_key(uint32_t key, char * buf) |
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212 { |
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213 char * cur = buf; |
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214 while (key) |
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215 { |
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216 *(cur++) = (key & 0x7F) + 1; |
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217 key >>= 7; |
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218 } |
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219 *cur = 0; |
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220 return buf; |
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221 } |
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222 |
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223 tern_node * tern_get_node(tern_val value) |
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224 { |
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225 return value.intval & 1 ? (tern_node *)(value.intval & ~1) : NULL; |
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226 } |