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| 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. | 1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. |
| 2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
| 3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
| 4 | 4 |
| 5 #include "base/environment.h" | 5 #include "base/environment.h" |
| 6 | 6 |
| 7 #include <stdlib.h> |
| 7 #include <vector> | 8 #include <vector> |
| 8 | 9 |
| 9 #include "base/strings/string_piece.h" | 10 #include "base/strings/string_piece.h" |
| 10 #include "base/strings/string_util.h" | 11 #include "base/strings/string_util.h" |
| 11 #include "base/strings/utf_string_conversions.h" | 12 #include "base/strings/utf_string_conversions.h" |
| 12 | 13 |
| 13 #if defined(OS_POSIX) | |
| 14 #include <stdlib.h> | |
| 15 #elif defined(OS_WIN) | |
| 16 #include <windows.h> | |
| 17 #endif | |
| 18 | |
| 19 namespace base { | 14 namespace base { |
| 20 | 15 |
| 21 namespace { | 16 namespace { |
| 22 | 17 |
| 23 class EnvironmentImpl : public Environment { | 18 class EnvironmentImpl : public Environment { |
| 24 public: | 19 public: |
| 25 bool GetVar(const char* variable_name, std::string* result) override { | 20 bool GetVar(const char* variable_name, std::string* result) override { |
| 26 if (GetVarImpl(variable_name, result)) | 21 if (GetVarImpl(variable_name, result)) |
| 27 return true; | 22 return true; |
| 28 | 23 |
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| 53 private: | 48 private: |
| 54 bool GetVarImpl(const char* variable_name, std::string* result) { | 49 bool GetVarImpl(const char* variable_name, std::string* result) { |
| 55 #if defined(OS_POSIX) | 50 #if defined(OS_POSIX) |
| 56 const char* env_value = getenv(variable_name); | 51 const char* env_value = getenv(variable_name); |
| 57 if (!env_value) | 52 if (!env_value) |
| 58 return false; | 53 return false; |
| 59 // Note that the variable may be defined but empty. | 54 // Note that the variable may be defined but empty. |
| 60 if (result) | 55 if (result) |
| 61 *result = env_value; | 56 *result = env_value; |
| 62 return true; | 57 return true; |
| 63 #elif defined(OS_WIN) | |
| 64 DWORD value_length = ::GetEnvironmentVariable( | |
| 65 UTF8ToWide(variable_name).c_str(), NULL, 0); | |
| 66 if (value_length == 0) | |
| 67 return false; | |
| 68 if (result) { | |
| 69 scoped_ptr<wchar_t[]> value(new wchar_t[value_length]); | |
| 70 ::GetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), value.get(), | |
| 71 value_length); | |
| 72 *result = WideToUTF8(value.get()); | |
| 73 } | |
| 74 return true; | |
| 75 #else | 58 #else |
| 76 #error need to port | 59 #error need to port |
| 77 #endif | 60 #endif |
| 78 } | 61 } |
| 79 | 62 |
| 80 bool SetVarImpl(const char* variable_name, const std::string& new_value) { | 63 bool SetVarImpl(const char* variable_name, const std::string& new_value) { |
| 81 #if defined(OS_POSIX) | |
| 82 // On success, zero is returned. | 64 // On success, zero is returned. |
| 83 return !setenv(variable_name, new_value.c_str(), 1); | 65 return !setenv(variable_name, new_value.c_str(), 1); |
| 84 #elif defined(OS_WIN) | |
| 85 // On success, a nonzero value is returned. | |
| 86 return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), | |
| 87 UTF8ToWide(new_value).c_str()); | |
| 88 #endif | |
| 89 } | 66 } |
| 90 | 67 |
| 91 bool UnSetVarImpl(const char* variable_name) { | 68 bool UnSetVarImpl(const char* variable_name) { |
| 92 #if defined(OS_POSIX) | |
| 93 // On success, zero is returned. | 69 // On success, zero is returned. |
| 94 return !unsetenv(variable_name); | 70 return !unsetenv(variable_name); |
| 95 #elif defined(OS_WIN) | |
| 96 // On success, a nonzero value is returned. | |
| 97 return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), NULL); | |
| 98 #endif | |
| 99 } | 71 } |
| 100 }; | 72 }; |
| 101 | 73 |
| 102 // Parses a null-terminated input string of an environment block. The key is | 74 // Parses a null-terminated input string of an environment block. The key is |
| 103 // placed into the given string, and the total length of the line, including | 75 // placed into the given string, and the total length of the line, including |
| 104 // the terminating null, is returned. | 76 // the terminating null, is returned. |
| 105 size_t ParseEnvLine(const NativeEnvironmentString::value_type* input, | 77 size_t ParseEnvLine(const NativeEnvironmentString::value_type* input, |
| 106 NativeEnvironmentString* key) { | 78 NativeEnvironmentString* key) { |
| 107 // Skip to the equals or end of the string, this is the key. | 79 // Skip to the equals or end of the string, this is the key. |
| 108 size_t cur = 0; | 80 size_t cur = 0; |
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| 132 | 104 |
| 133 // static | 105 // static |
| 134 Environment* Environment::Create() { | 106 Environment* Environment::Create() { |
| 135 return new EnvironmentImpl(); | 107 return new EnvironmentImpl(); |
| 136 } | 108 } |
| 137 | 109 |
| 138 bool Environment::HasVar(const char* variable_name) { | 110 bool Environment::HasVar(const char* variable_name) { |
| 139 return GetVar(variable_name, NULL); | 111 return GetVar(variable_name, NULL); |
| 140 } | 112 } |
| 141 | 113 |
| 142 #if defined(OS_WIN) | |
| 143 | |
| 144 string16 AlterEnvironment(const wchar_t* env, | |
| 145 const EnvironmentMap& changes) { | |
| 146 string16 result; | |
| 147 | |
| 148 // First copy all unmodified values to the output. | |
| 149 size_t cur_env = 0; | |
| 150 string16 key; | |
| 151 while (env[cur_env]) { | |
| 152 const wchar_t* line = &env[cur_env]; | |
| 153 size_t line_length = ParseEnvLine(line, &key); | |
| 154 | |
| 155 // Keep only values not specified in the change vector. | |
| 156 EnvironmentMap::const_iterator found_change = changes.find(key); | |
| 157 if (found_change == changes.end()) | |
| 158 result.append(line, line_length); | |
| 159 | |
| 160 cur_env += line_length; | |
| 161 } | |
| 162 | |
| 163 // Now append all modified and new values. | |
| 164 for (EnvironmentMap::const_iterator i = changes.begin(); | |
| 165 i != changes.end(); ++i) { | |
| 166 if (!i->second.empty()) { | |
| 167 result.append(i->first); | |
| 168 result.push_back('='); | |
| 169 result.append(i->second); | |
| 170 result.push_back(0); | |
| 171 } | |
| 172 } | |
| 173 | |
| 174 // An additional null marks the end of the list. We always need a double-null | |
| 175 // in case nothing was added above. | |
| 176 if (result.empty()) | |
| 177 result.push_back(0); | |
| 178 result.push_back(0); | |
| 179 return result; | |
| 180 } | |
| 181 | |
| 182 #elif defined(OS_POSIX) | |
| 183 | |
| 184 scoped_ptr<char*[]> AlterEnvironment(const char* const* const env, | 114 scoped_ptr<char*[]> AlterEnvironment(const char* const* const env, |
| 185 const EnvironmentMap& changes) { | 115 const EnvironmentMap& changes) { |
| 186 std::string value_storage; // Holds concatenated null-terminated strings. | 116 std::string value_storage; // Holds concatenated null-terminated strings. |
| 187 std::vector<size_t> result_indices; // Line indices into value_storage. | 117 std::vector<size_t> result_indices; // Line indices into value_storage. |
| 188 | 118 |
| 189 // First build up all of the unchanged environment strings. These are | 119 // First build up all of the unchanged environment strings. These are |
| 190 // null-terminated of the form "key=value". | 120 // null-terminated of the form "key=value". |
| 191 std::string key; | 121 std::string key; |
| 192 for (size_t i = 0; env[i]; i++) { | 122 for (size_t i = 0; env[i]; i++) { |
| 193 size_t line_length = ParseEnvLine(env[i], &key); | 123 size_t line_length = ParseEnvLine(env[i], &key); |
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| 224 memcpy(storage_data, value_storage.data(), value_storage.size()); | 154 memcpy(storage_data, value_storage.data(), value_storage.size()); |
| 225 | 155 |
| 226 // Fill array of pointers at the beginning of the result. | 156 // Fill array of pointers at the beginning of the result. |
| 227 for (size_t i = 0; i < result_indices.size(); i++) | 157 for (size_t i = 0; i < result_indices.size(); i++) |
| 228 result[i] = &storage_data[result_indices[i]]; | 158 result[i] = &storage_data[result_indices[i]]; |
| 229 result[result_indices.size()] = 0; // Null terminator. | 159 result[result_indices.size()] = 0; // Null terminator. |
| 230 | 160 |
| 231 return result.Pass(); | 161 return result.Pass(); |
| 232 } | 162 } |
| 233 | 163 |
| 234 #endif // OS_POSIX | |
| 235 | |
| 236 } // namespace base | 164 } // namespace base |
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