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annotate tern.c @ 1742:6290c88949bd

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Fixed CPI/CPD/CPIR/CPDR in new Z80 core
author Michael Pavone <pavone@retrodev.com>
date Mon, 04 Feb 2019 23:46:35 -0800
parents 63659fb92db4
children 193b804c9845
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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 const * key, tern_val value, uint8_t valtype)
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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 (*cur)->valtype = TVAL_NONE;
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35 }
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36 cur = &((*cur)->straight.next);
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37 key++;
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38 }
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39 while(*cur && (*cur)->el)
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40 {
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41 cur = &(*cur)->left;
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42 }
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43 if (!*cur) {
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44 *cur = malloc(sizeof(tern_node));
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45 (*cur)->left = NULL;
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46 (*cur)->right = NULL;
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47 (*cur)->el = 0;
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48 (*cur)->valtype = TVAL_NONE;
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49 }
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50 if ((*cur)->valtype == TVAL_PTR) {
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51 //not freeing tern nodes can also cause leaks, but handling freeing those here is problematic
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52 //since updating a sub-tree may involve creating a new root node
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53 free((*cur)->straight.value.ptrval);
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54 }
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55 (*cur)->straight.value = value;
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56 (*cur)->valtype = valtype;
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57 return head;
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58 }
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59
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60 uint8_t tern_find(tern_node * head, char const * key, tern_val *ret)
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61 {
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62 tern_node * cur = head;
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63 while (cur)
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64 {
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65 if (cur->el == *key) {
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66 if (*key) {
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67 cur = cur->straight.next;
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68 key++;
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69 } else {
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70 *ret = cur->straight.value;
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71 return cur->valtype;
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72 }
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73 } else if (*key < cur->el) {
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74 cur = cur->left;
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75 } else {
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76 cur = cur->right;
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77 }
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78 }
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79 return TVAL_NONE;
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80 }
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81
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82 tern_node * tern_find_prefix(tern_node * head, char const * key)
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83 {
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84 tern_node * cur = head;
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85 while (cur && *key)
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86 {
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87 if (cur->el == *key) {
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88 cur = cur->straight.next;
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89 key++;
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90 } else if (*key < cur->el) {
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91 cur = cur->left;
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92 } else {
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93 cur = cur->right;
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94 }
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95 }
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96 return cur;
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97 }
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98
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99 intptr_t tern_find_int(tern_node * head, char const * key, intptr_t def)
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100 {
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101 tern_val ret;
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102 uint8_t valtype = tern_find(head, key, &ret);
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103 if (valtype == TVAL_INT) {
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104 return ret.intval;
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105 }
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106 return def;
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107 }
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108
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109 tern_node * tern_insert_int(tern_node * head, char const * key, intptr_t value)
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110 {
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111 tern_val val;
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112 val.intval = value;
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113 return tern_insert(head, key, val, TVAL_INT);
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114 }
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115
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116 void * tern_find_ptr_default(tern_node * head, char const * key, void * def)
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117 {
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118 tern_val ret;
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119 uint8_t valtype = tern_find(head, key, &ret);
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120 if (valtype == TVAL_PTR) {
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121 return ret.ptrval;
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122 }
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123 return def;
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124 }
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125
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126 void * tern_find_ptr(tern_node * head, char const * key)
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127 {
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128 return tern_find_ptr_default(head, key, NULL);
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129 }
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130
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131 tern_node *tern_find_node(tern_node *head, char const *key)
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132 {
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133 tern_val ret;
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134 uint8_t valtype = tern_find(head, key, &ret);
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135 if (valtype == TVAL_NODE) {
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
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136 return ret.ptrval;
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137 }
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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138 return NULL;
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
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139 }
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
diff changeset
140
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diff changeset
141 uint8_t tern_delete(tern_node **head, char const *key, tern_val *out)
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142 {
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143 tern_node *cur = *head, **last = head;
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diff changeset
144 while (cur)
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145 {
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parents: 1491
diff changeset
146 if (cur->el == *key) {
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parents: 1491
diff changeset
147 if (*key) {
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diff changeset
148 last = &cur->straight.next;
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149 cur = cur->straight.next;
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150 key++;
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parents: 1491
diff changeset
151 } else {
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parents: 1491
diff changeset
152 break;
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parents: 1491
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153 }
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parents: 1491
diff changeset
154 } else if (*key < cur->el) {
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parents: 1491
diff changeset
155 last = &cur->left;
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parents: 1491
diff changeset
156 cur = cur->left;
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parents: 1491
diff changeset
157 } else {
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diff changeset
158 last = &cur->right;
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159 cur = cur->right;
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160 }
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parents: 1491
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161 }
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parents: 1491
diff changeset
162 if (!cur) {
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parents: 1491
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163 return TVAL_NONE;
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parents: 1491
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164 }
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165 *last = cur->right;
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166 uint8_t valtype = cur->valtype;
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167 if (out) {
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168 *out = cur->straight.value;
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169 }
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170 free(cur);
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171 return valtype;
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172 }
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173
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174 tern_val tern_find_path_default(tern_node *head, char const *key, tern_val def, uint8_t req_valtype)
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175 {
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176 tern_val ret;
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177 while (*key)
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178 {
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179 uint8_t valtype = tern_find(head, key, &ret);
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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180 if (!valtype) {
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181 return def;
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182 }
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183 key = key + strlen(key) + 1;
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184 if (*key) {
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parents: 1293
diff changeset
185 if (valtype != TVAL_NODE) {
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186 return def;
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187 }
1326
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
diff changeset
188 head = ret.ptrval;
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189 } else if (req_valtype && req_valtype != valtype) {
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190 return def;
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191 }
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192 }
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193 return ret;
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194 }
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195
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diff changeset
196 tern_val tern_find_path(tern_node *head, char const *key, uint8_t valtype)
766
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197 {
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198 tern_val def;
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199 def.ptrval = NULL;
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200 return tern_find_path_default(head, key, def, valtype);
766
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201 }
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202
1186
110251ea369e Consting up some parameters to ternary tree functions
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parents: 792
diff changeset
203 tern_node * tern_insert_ptr(tern_node * head, char const * key, void * value)
429
f6fdde540791 Added ternary tree implementation and a simple test program for it
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parents:
diff changeset
204 {
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parents:
diff changeset
205 tern_val val;
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parents:
diff changeset
206 val.ptrval = value;
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diff changeset
207 return tern_insert(head, key, val, TVAL_PTR);
429
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parents:
diff changeset
208 }
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parents:
diff changeset
209
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parents: 792
diff changeset
210 tern_node * tern_insert_node(tern_node *head, char const *key, tern_node *value)
766
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diff changeset
211 {
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diff changeset
212 tern_val val;
1326
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parents: 1293
diff changeset
213 val.ptrval = value;
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
diff changeset
214 return tern_insert(head, key, val, TVAL_NODE);
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215 }
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parents: 631
diff changeset
216
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diff changeset
217 tern_node *tern_insert_path(tern_node *head, char const *key, tern_val val, uint8_t valtype)
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218 {
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diff changeset
219 const char *next_key = key + strlen(key) + 1;
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parents: 1326
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220 if (*next_key) {
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parents: 1326
diff changeset
221 tern_node *child = tern_find_node(head, key);
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parents: 1326
diff changeset
222 child = tern_insert_path(child, next_key, val, valtype);
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parents: 1326
diff changeset
223 return tern_insert_node(head, key, child);
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parents: 1326
diff changeset
224 } else {
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parents: 1326
diff changeset
225 return tern_insert(head, key, val, valtype);
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parents: 1326
diff changeset
226 }
e890971f3757 Somewhat fleshed out video settings view
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parents: 1326
diff changeset
227 }
e890971f3757 Somewhat fleshed out video settings view
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parents: 1326
diff changeset
228
1522
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diff changeset
229 uint8_t tern_delete_path(tern_node **head, char const *key, tern_val *out)
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parents: 1491
diff changeset
230 {
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parents: 1491
diff changeset
231 const char *next_key = key + strlen(key) + 1;
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parents: 1491
diff changeset
232 if (*next_key) {
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parents: 1491
diff changeset
233 tern_node *child = tern_find_node(*head, key);
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parents: 1491
diff changeset
234 if (!child) {
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parents: 1491
diff changeset
235 return TVAL_NONE;
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parents: 1491
diff changeset
236 }
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parents: 1491
diff changeset
237 tern_node *tmp = child;
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parents: 1491
diff changeset
238 uint8_t valtype = tern_delete_path(&tmp, next_key, out);
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parents: 1491
diff changeset
239 if (tmp != child) {
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parents: 1491
diff changeset
240 *head = tern_insert_node(*head, key, tmp);
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parents: 1491
diff changeset
241 }
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parents: 1491
diff changeset
242 return valtype;
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parents: 1491
diff changeset
243 } else {
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parents: 1491
diff changeset
244 return tern_delete(head, key, out);
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diff changeset
245 }
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diff changeset
246 }
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parents: 1491
diff changeset
247
766
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diff changeset
248 uint32_t tern_count(tern_node *head)
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diff changeset
249 {
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parents: 631
diff changeset
250 uint32_t count = 0;
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parents: 631
diff changeset
251 if (head->left) {
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parents: 631
diff changeset
252 count += tern_count(head->left);
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parents: 631
diff changeset
253 }
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parents: 631
diff changeset
254 if (head->right) {
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parents: 631
diff changeset
255 count += tern_count(head->right);
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parents: 631
diff changeset
256 }
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parents: 631
diff changeset
257 if (!head->el) {
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parents: 631
diff changeset
258 count++;
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parents: 631
diff changeset
259 } else if (head->straight.next) {
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parents: 631
diff changeset
260 count += tern_count(head->straight.next);
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parents: 631
diff changeset
261 }
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parents: 631
diff changeset
262 return count;
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parents: 631
diff changeset
263 }
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parents: 631
diff changeset
264
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parents: 631
diff changeset
265 #define MAX_ITER_KEY 127
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parents: 631
diff changeset
266 void tern_foreach_int(tern_node *head, iter_fun fun, void *data, char *keybuf, int pos)
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parents: 631
diff changeset
267 {
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parents: 631
diff changeset
268 if (!head->el) {
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parents: 631
diff changeset
269 keybuf[pos] = 0;
1326
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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parents: 1293
diff changeset
270 fun(keybuf, head->straight.value, head->valtype, data);
766
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diff changeset
271 }
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parents: 631
diff changeset
272 if (head->left) {
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273 tern_foreach_int(head->left, fun, data, keybuf, pos);
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274 }
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275 if (head->el && head->straight.next) {
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276 if (pos == MAX_ITER_KEY) {
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277 fatal_error("tern_foreach_int: exceeded maximum key size");
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278 }
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279 keybuf[pos] = head->el;
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280 tern_foreach_int(head->straight.next, fun, data, keybuf, pos+1);
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281 }
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282 if (head->right) {
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283 tern_foreach_int(head->right, fun, data, keybuf, pos);
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284 }
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285 }
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286
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287 void tern_foreach(tern_node *head, iter_fun fun, void *data)
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288 {
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289 //lame, but good enough for my purposes
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290 char key[MAX_ITER_KEY+1];
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291 tern_foreach_int(head, fun, data, key, 0);
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292 }
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293
631
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294 char * tern_int_key(uint32_t key, char * buf)
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295 {
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296 char * cur = buf;
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297 while (key)
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298 {
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299 *(cur++) = (key & 0x7F) + 1;
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300 key >>= 7;
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301 }
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302 *cur = 0;
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303 return buf;
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304 }
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305
1293
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306 void tern_free(tern_node *head)
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307 {
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308 if (head->left) {
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309 tern_free(head->left);
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310 }
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311 if (head->right) {
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312 tern_free(head->right);
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313 }
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314 if (head->el) {
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315 tern_free(head->straight.next);
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316 }
1326
071e761bcdcf Fix a deficiency in the way types were handled in my ternary tree. Fixes in which some paths that were constructed from a template with variables would sometimes get an extra garbage character thrown in
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317 free(head);
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318 }