Improve the encoding/decoding to/from system encoding on Windows

runtime/bin/utils_linux.cc

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "platform/globals.h"
 #if defined(TARGET_OS_LINUX)
 
 #include <errno.h>  // NOLINT
 #include <netdb.h>  // NOLINT
 #include <sys/time.h>  // NOLINT
@@ skipping 22 matching lines @@
     const int kBufferSize = 1024;
     char error_buf[kBufferSize];
     SetMessage(strerror_r(code, error_buf, kBufferSize));
   } else if (sub_system == kGetAddressInfo) {
     SetMessage(gai_strerror(code));
   } else {
     UNREACHABLE();
   }
 }
 
-const char* StringUtils::ConsoleStringToUtf8(const char* str) {
-  return str;
-}
-
-const char* StringUtils::Utf8ToConsoleString(const char* utf8) {
-  return utf8;
-}
-
-char* StringUtils::ConsoleStringToUtf8(char* str) {
-  return str;
-}
-
-char* StringUtils::Utf8ToConsoleString(char* utf8) {
-  return utf8;
-}
-
-wchar_t* StringUtils::Utf8ToWide(char* utf8) {
+const char* StringUtils::ConsoleStringToUtf8(
+    const char* str, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-const wchar_t* StringUtils::Utf8ToWide(const char* utf8) {
+const char* StringUtils::Utf8ToConsoleString(
+    const char* utf8, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-char* StringUtils::WideToUtf8(wchar_t* str) {
+char* StringUtils::ConsoleStringToUtf8(
+    char* str, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-const char* StringUtils::WideToUtf8(const wchar_t* str) {
+char* StringUtils::Utf8ToConsoleString(
+    char* utf8, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-wchar_t** ShellUtils::GetUnicodeArgv(int* argc) {
-  return NULL;
-}
-
-void ShellUtils::FreeUnicodeArgv(wchar_t** argv) {
+bool ShellUtils::GetUtf8Argv(int argc, char** argv) {
+  return false;
 }
 
 int64_t TimerUtils::GetCurrentTimeMilliseconds() {
   return GetCurrentTimeMicros() / 1000;
 }
 
 int64_t TimerUtils::GetCurrentTimeMicros() {
   struct timeval tv;
   if (gettimeofday(&tv, NULL) < 0) {
     UNREACHABLE();
@@ skipping 20 matching lines @@
     ASSERT(errno == EINTR);
     // Copy remainder into requested and repeat.
     req = rem;
   }
 }
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // defined(TARGET_OS_LINUX)