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1894 | jermar | 1 | /* |
2 | * Copyright (C) 2006 Jakub Jermar |
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3 | * All rights reserved. |
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4 | * |
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5 | * Redistribution and use in source and binary forms, with or without |
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6 | * modification, are permitted provided that the following conditions |
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7 | * are met: |
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8 | * |
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9 | * - Redistributions of source code must retain the above copyright |
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10 | * notice, this list of conditions and the following disclaimer. |
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11 | * - Redistributions in binary form must reproduce the above copyright |
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12 | * notice, this list of conditions and the following disclaimer in the |
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13 | * documentation and/or other materials provided with the distribution. |
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14 | * - The name of the author may not be used to endorse or promote products |
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15 | * derived from this software without specific prior written permission. |
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16 | * |
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17 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR |
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18 | * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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19 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. |
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20 | * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, |
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21 | * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT |
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22 | * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
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23 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
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24 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
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25 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF |
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26 | * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
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27 | */ |
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28 | |||
29 | /** @addtogroup ofw |
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30 | * @{ |
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31 | */ |
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32 | /** |
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33 | * @file |
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34 | * @brief OpenFirmware device tree navigation. |
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35 | * |
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36 | */ |
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37 | |||
1895 | jermar | 38 | #include <genarch/ofw/ofw_tree.h> |
39 | #include <arch/memstr.h> |
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1972 | jermar | 40 | #include <mm/slab.h> |
1895 | jermar | 41 | #include <func.h> |
42 | #include <print.h> |
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43 | #include <panic.h> |
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44 | |||
45 | #define PATH_MAX_LEN 80 |
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46 | #define NAME_BUF_LEN 50 |
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47 | |||
48 | static ofw_tree_node_t *ofw_root; |
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49 | |||
50 | void ofw_tree_init(ofw_tree_node_t *root) |
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51 | { |
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52 | ofw_root = root; |
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53 | } |
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54 | |||
1896 | jermar | 55 | /** Get OpenFirmware node property. |
56 | * |
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57 | * @param node Node in which to lookup the property. |
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58 | * @param name Name of the property. |
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59 | * |
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60 | * @return Pointer to the property structure or NULL if no such property. |
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61 | */ |
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62 | ofw_tree_property_t *ofw_tree_getprop(const ofw_tree_node_t *node, const char *name) |
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63 | { |
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64 | int i; |
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65 | |||
66 | for (i = 0; i < node->properties; i++) { |
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67 | if (strcmp(node->property[i].name, name) == 0) |
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68 | return &node->property[i]; |
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69 | } |
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70 | |||
71 | return NULL; |
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72 | } |
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73 | |||
1895 | jermar | 74 | /** Return value of the 'name' property. |
75 | * |
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76 | * @param node Node of interest. |
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77 | * |
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78 | * @return Value of the 'name' property belonging to the node. |
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79 | */ |
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80 | const char *ofw_tree_node_name(const ofw_tree_node_t *node) |
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81 | { |
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1896 | jermar | 82 | ofw_tree_property_t *prop; |
1895 | jermar | 83 | |
1896 | jermar | 84 | prop = ofw_tree_getprop(node, "name"); |
85 | if (!prop) |
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86 | panic("Node without name property.\n"); |
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87 | |||
88 | if (prop->size < 2) |
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89 | panic("Invalid name property.\n"); |
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1895 | jermar | 90 | |
1896 | jermar | 91 | return prop->value; |
1895 | jermar | 92 | } |
93 | |||
94 | /** Lookup child of given name. |
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95 | * |
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96 | * @param node Node whose child is being looked up. |
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1896 | jermar | 97 | * @param name Name of the child being looked up. |
1895 | jermar | 98 | * |
99 | * @return NULL if there is no such child or pointer to the matching child node. |
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100 | */ |
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1899 | jermar | 101 | ofw_tree_node_t *ofw_tree_find_child(ofw_tree_node_t *node, const char *name) |
1895 | jermar | 102 | { |
103 | ofw_tree_node_t *cur; |
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104 | |||
1896 | jermar | 105 | /* |
106 | * Try to find the disambigued name. |
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107 | */ |
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1895 | jermar | 108 | for (cur = node->child; cur; cur = cur->peer) { |
1896 | jermar | 109 | if (strcmp(cur->da_name, name) == 0) |
1895 | jermar | 110 | return cur; |
111 | } |
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112 | |||
1896 | jermar | 113 | /* |
114 | * Disambigued name not found. |
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115 | * Lets try our luck with possibly ambiguous "name" property. |
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116 | * |
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117 | * We need to do this because paths stored in "/aliases" |
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118 | * are not always fully-qualified. |
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119 | */ |
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120 | for (cur = node->child; cur; cur = cur->peer) { |
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121 | if (strcmp(ofw_tree_node_name(cur), name) == 0) |
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122 | return cur; |
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123 | } |
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124 | |||
1895 | jermar | 125 | return NULL; |
126 | } |
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127 | |||
1899 | jermar | 128 | /** Lookup first child of given device type. |
129 | * |
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130 | * @param node Node whose child is being looked up. |
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131 | * @param name Device type of the child being looked up. |
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132 | * |
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133 | * @return NULL if there is no such child or pointer to the matching child node. |
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134 | */ |
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135 | ofw_tree_node_t *ofw_tree_find_child_by_device_type(ofw_tree_node_t *node, const char *name) |
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136 | { |
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137 | ofw_tree_node_t *cur; |
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138 | ofw_tree_property_t *prop; |
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139 | |||
140 | for (cur = node->child; cur; cur = cur->peer) { |
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141 | prop = ofw_tree_getprop(cur, "device_type"); |
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142 | if (!prop || !prop->value) |
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143 | continue; |
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144 | if (strcmp(prop->value, name) == 0) |
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145 | return cur; |
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146 | } |
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147 | |||
148 | return NULL; |
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149 | } |
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150 | |||
1908 | jermar | 151 | /** Lookup node with matching node_handle. |
152 | * |
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153 | * @param root Root of the searched subtree. |
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154 | * @param handle OpenFirmware handle. |
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155 | * |
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156 | * @return NULL if there is no such node or pointer to the matching node. |
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157 | */ |
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158 | ofw_tree_node_t *ofw_tree_find_node_by_handle(ofw_tree_node_t *root, uint32_t handle) |
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159 | { |
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160 | ofw_tree_node_t *node; |
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161 | |||
162 | if (root->node_handle == handle) |
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163 | return root; |
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164 | |||
165 | if (root->peer) { |
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166 | node = ofw_tree_find_node_by_handle(root->peer, handle); |
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167 | if (node) |
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168 | return node; |
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169 | } |
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170 | |||
171 | if (root->child) { |
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172 | node = ofw_tree_find_node_by_handle(root->child, handle); |
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173 | if (node) |
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174 | return node; |
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175 | } |
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176 | |||
177 | return NULL; |
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178 | } |
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179 | |||
1899 | jermar | 180 | /** Lookup first peer of given device type. |
181 | * |
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182 | * @param node Node whose peer is being looked up. |
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183 | * @param name Device type of the child being looked up. |
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184 | * |
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185 | * @return NULL if there is no such child or pointer to the matching child node. |
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186 | */ |
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187 | ofw_tree_node_t *ofw_tree_find_peer_by_device_type(ofw_tree_node_t *node, const char *name) |
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188 | { |
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189 | ofw_tree_node_t *cur; |
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190 | ofw_tree_property_t *prop; |
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191 | |||
192 | for (cur = node->peer; cur; cur = cur->peer) { |
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193 | prop = ofw_tree_getprop(cur, "device_type"); |
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194 | if (!prop || !prop->value) |
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195 | continue; |
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196 | if (strcmp(prop->value, name) == 0) |
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197 | return cur; |
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198 | } |
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199 | |||
200 | return NULL; |
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201 | } |
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202 | |||
203 | |||
1895 | jermar | 204 | /** Lookup OpenFirmware node by its path. |
205 | * |
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206 | * @param path Path to the node. |
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207 | * |
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208 | * @return NULL if there is no such node or pointer to the leaf node. |
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209 | */ |
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210 | ofw_tree_node_t *ofw_tree_lookup(const char *path) |
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211 | { |
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212 | char buf[NAME_BUF_LEN+1]; |
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213 | ofw_tree_node_t *node = ofw_root; |
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214 | index_t i, j; |
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215 | |||
216 | if (path[0] != '/') |
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217 | return NULL; |
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218 | |||
219 | for (i = 1; i < strlen(path) && node; i = j + 1) { |
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220 | for (j = i; j < strlen(path) && path[j] != '/'; j++) |
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221 | ; |
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222 | if (i == j) /* skip extra slashes */ |
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223 | continue; |
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224 | |||
225 | memcpy(buf, &path[i], j - i); |
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226 | buf[j - i] = '\0'; |
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227 | node = ofw_tree_find_child(node, buf); |
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228 | } |
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229 | |||
230 | return node; |
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231 | } |
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232 | |||
233 | /** Recursively print subtree rooted in a node. |
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234 | * |
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235 | * @param node Root of the subtree. |
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236 | * @param path Current path, NULL for the very root of the entire tree. |
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237 | */ |
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238 | static void ofw_tree_node_print(const ofw_tree_node_t *node, const char *path) |
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239 | { |
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1972 | jermar | 240 | char *p; |
241 | |||
242 | p = (char *) malloc(PATH_MAX_LEN, 0); |
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243 | |||
1895 | jermar | 244 | if (node->parent) { |
245 | snprintf(p, PATH_MAX_LEN, "%s/%s", path, node->da_name); |
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246 | printf("%s\n", p); |
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247 | } else { |
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248 | snprintf(p, PATH_MAX_LEN, "%s", node->da_name); |
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249 | printf("/\n"); |
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250 | } |
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251 | |||
252 | if (node->child) |
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253 | ofw_tree_node_print(node->child, p); |
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1972 | jermar | 254 | |
1895 | jermar | 255 | if (node->peer) |
256 | ofw_tree_node_print(node->peer, path); |
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1972 | jermar | 257 | |
258 | free(p); |
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1895 | jermar | 259 | } |
260 | |||
261 | /** Print the structure of the OpenFirmware device tree. */ |
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262 | void ofw_tree_print(void) |
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263 | { |
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264 | ofw_tree_node_print(ofw_root, NULL); |
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265 | } |
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266 | |||
1894 | jermar | 267 | /** @} |
268 | */ |