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annotate tern.c @ 995:2bc27415565b

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Fix some stuff with interrupt timing. The change in adjust_int_cycle gets Overdrive working again (vint was not being preferred over hint in some cases). One of the changes seems to have broken Fatal Rewind again, but no other regressions that I can see.
author Michael Pavone <pavone@retrodev.com>
date Sat, 30 Apr 2016 08:37:55 -0700
parents 724bbec47f86
children 110251ea369e
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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 }