Move base to DEPS

base/environment.cc

-// Copyright (c) 2012 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#include "base/environment.h"
-
-#include <vector>
-
-#include "base/strings/string_piece.h"
-#include "base/strings/string_util.h"
-#include "base/strings/utf_string_conversions.h"
-
-#if defined(OS_POSIX)
-#include <stdlib.h>
-#elif defined(OS_WIN)
-#include <windows.h>
-#endif
-
-namespace base {
-
-namespace {
-
-class EnvironmentImpl : public Environment {
- public:
-  bool GetVar(const char* variable_name, std::string* result) override {
-    if (GetVarImpl(variable_name, result))
-      return true;
-
-    // Some commonly used variable names are uppercase while others
-    // are lowercase, which is inconsistent. Let's try to be helpful
-    // and look for a variable name with the reverse case.
-    // I.e. HTTP_PROXY may be http_proxy for some users/systems.
-    char first_char = variable_name[0];
-    std::string alternate_case_var;
-    if (first_char >= 'a' && first_char <= 'z')
-      alternate_case_var = StringToUpperASCII(std::string(variable_name));
-    else if (first_char >= 'A' && first_char <= 'Z')
-      alternate_case_var = StringToLowerASCII(std::string(variable_name));
-    else
-      return false;
-    return GetVarImpl(alternate_case_var.c_str(), result);
-  }
-
-  bool SetVar(const char* variable_name,
-              const std::string& new_value) override {
-    return SetVarImpl(variable_name, new_value);
-  }
-
-  bool UnSetVar(const char* variable_name) override {
-    return UnSetVarImpl(variable_name);
-  }
-
- private:
-  bool GetVarImpl(const char* variable_name, std::string* result) {
-#if defined(OS_POSIX)
-    const char* env_value = getenv(variable_name);
-    if (!env_value)
-      return false;
-    // Note that the variable may be defined but empty.
-    if (result)
-      *result = env_value;
-    return true;
-#elif defined(OS_WIN)
-    DWORD value_length = ::GetEnvironmentVariable(
-        UTF8ToWide(variable_name).c_str(), NULL, 0);
-    if (value_length == 0)
-      return false;
-    if (result) {
-      scoped_ptr<wchar_t[]> value(new wchar_t[value_length]);
-      ::GetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), value.get(),
-                               value_length);
-      *result = WideToUTF8(value.get());
-    }
-    return true;
-#else
-#error need to port
-#endif
-  }
-
-  bool SetVarImpl(const char* variable_name, const std::string& new_value) {
-#if defined(OS_POSIX)
-    // On success, zero is returned.
-    return !setenv(variable_name, new_value.c_str(), 1);
-#elif defined(OS_WIN)
-    // On success, a nonzero value is returned.
-    return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(),
-                                    UTF8ToWide(new_value).c_str());
-#endif
-  }
-
-  bool UnSetVarImpl(const char* variable_name) {
-#if defined(OS_POSIX)
-    // On success, zero is returned.
-    return !unsetenv(variable_name);
-#elif defined(OS_WIN)
-    // On success, a nonzero value is returned.
-    return !!SetEnvironmentVariable(UTF8ToWide(variable_name).c_str(), NULL);
-#endif
-  }
-};
-
-// Parses a null-terminated input string of an environment block. The key is
-// placed into the given string, and the total length of the line, including
-// the terminating null, is returned.
-size_t ParseEnvLine(const NativeEnvironmentString::value_type* input,
-                    NativeEnvironmentString* key) {
-  // Skip to the equals or end of the string, this is the key.
-  size_t cur = 0;
-  while (input[cur] && input[cur] != '=')
-    cur++;
-  *key = NativeEnvironmentString(&input[0], cur);
-
-  // Now just skip to the end of the string.
-  while (input[cur])
-    cur++;
-  return cur + 1;
-}
-
-}  // namespace
-
-namespace env_vars {
-
-#if defined(OS_POSIX)
-// On Posix systems, this variable contains the location of the user's home
-// directory. (e.g, /home/username/).
-const char kHome[] = "HOME";
-#endif
-
-}  // namespace env_vars
-
-Environment::~Environment() {}
-
-// static
-Environment* Environment::Create() {
-  return new EnvironmentImpl();
-}
-
-bool Environment::HasVar(const char* variable_name) {
-  return GetVar(variable_name, NULL);
-}
-
-#if defined(OS_WIN)
-
-string16 AlterEnvironment(const wchar_t* env,
-                          const EnvironmentMap& changes) {
-  string16 result;
-
-  // First copy all unmodified values to the output.
-  size_t cur_env = 0;
-  string16 key;
-  while (env[cur_env]) {
-    const wchar_t* line = &env[cur_env];
-    size_t line_length = ParseEnvLine(line, &key);
-
-    // Keep only values not specified in the change vector.
-    EnvironmentMap::const_iterator found_change = changes.find(key);
-    if (found_change == changes.end())
-      result.append(line, line_length);
-
-    cur_env += line_length;
-  }
-
-  // Now append all modified and new values.
-  for (EnvironmentMap::const_iterator i = changes.begin();
-       i != changes.end(); ++i) {
-    if (!i->second.empty()) {
-      result.append(i->first);
-      result.push_back('=');
-      result.append(i->second);
-      result.push_back(0);
-    }
-  }
-
-  // An additional null marks the end of the list. We always need a double-null
-  // in case nothing was added above.
-  if (result.empty())
-    result.push_back(0);
-  result.push_back(0);
-  return result;
-}
-
-#elif defined(OS_POSIX)
-
-scoped_ptr<char*[]> AlterEnvironment(const char* const* const env,
-                                     const EnvironmentMap& changes) {
-  std::string value_storage;  // Holds concatenated null-terminated strings.
-  std::vector<size_t> result_indices;  // Line indices into value_storage.
-
-  // First build up all of the unchanged environment strings. These are
-  // null-terminated of the form "key=value".
-  std::string key;
-  for (size_t i = 0; env[i]; i++) {
-    size_t line_length = ParseEnvLine(env[i], &key);
-
-    // Keep only values not specified in the change vector.
-    EnvironmentMap::const_iterator found_change = changes.find(key);
-    if (found_change == changes.end()) {
-      result_indices.push_back(value_storage.size());
-      value_storage.append(env[i], line_length);
-    }
-  }
-
-  // Now append all modified and new values.
-  for (EnvironmentMap::const_iterator i = changes.begin();
-       i != changes.end(); ++i) {
-    if (!i->second.empty()) {
-      result_indices.push_back(value_storage.size());
-      value_storage.append(i->first);
-      value_storage.push_back('=');
-      value_storage.append(i->second);
-      value_storage.push_back(0);
-    }
-  }
-
-  size_t pointer_count_required =
-      result_indices.size() + 1 +  // Null-terminated array of pointers.
-      (value_storage.size() + sizeof(char*) - 1) / sizeof(char*);  // Buffer.
-  scoped_ptr<char*[]> result(new char*[pointer_count_required]);
-
-  // The string storage goes after the array of pointers.
-  char* storage_data = reinterpret_cast<char*>(
-      &result.get()[result_indices.size() + 1]);
-  if (!value_storage.empty())
-    memcpy(storage_data, value_storage.data(), value_storage.size());
-
-  // Fill array of pointers at the beginning of the result.
-  for (size_t i = 0; i < result_indices.size(); i++)
-    result[i] = &storage_data[result_indices[i]];
-  result[result_indices.size()] = 0;  // Null terminator.
-
-  return result.Pass();
-}
-
-#endif  // OS_POSIX
-
-}  // namespace base