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

runtime/bin/utils_macos.cc

Index: runtime/bin/utils_macos.cc
diff --git a/runtime/bin/utils_macos.cc b/runtime/bin/utils_macos.cc
index 460da354a688527ddc11f39dbd9600744694ee82..c5dd68a4979916bfee430d15495fd4fe4911b434 100644
--- a/runtime/bin/utils_macos.cc
+++ b/runtime/bin/utils_macos.cc
@@ -42,38 +42,58 @@ void OSError::SetCodeAndMessage(SubSystem sub_system, int code) {
   }
 }
 
-const char* StringUtils::ConsoleStringToUtf8(const char* str) {
+const char* StringUtils::ConsoleStringToUtf8(
+    const char* str, intptr_t len, intptr_t* result_len) {
+  if (result_len != NULL) {
+    *result_len = len;
+  }
   return str;
 }
 
-const char* StringUtils::Utf8ToConsoleString(const char* utf8) {
+const char* StringUtils::Utf8ToConsoleString(
+    const char* utf8, intptr_t len, intptr_t* result_len) {
+  if (result_len != NULL) {
+    *result_len = len;
+  }
   return utf8;
 }
 
-char* StringUtils::ConsoleStringToUtf8(char* str) {
+char* StringUtils::ConsoleStringToUtf8(
+    char* str, intptr_t len, intptr_t* result_len) {
+  if (result_len != NULL) {
+    *result_len = len;
+  }
   return str;
 }
 
-char* StringUtils::Utf8ToConsoleString(char* utf8) {
+char* StringUtils::Utf8ToConsoleString(
+    char* utf8, intptr_t len, intptr_t* result_len) {
+  if (result_len != NULL) {
+    *result_len = len;
+  }
   return utf8;
 }
 
-wchar_t* StringUtils::Utf8ToWide(char* utf8) {
+wchar_t* StringUtils::Utf8ToWide(
+    char* utf8, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-const wchar_t* StringUtils::Utf8ToWide(const char* utf8) {
+const wchar_t* StringUtils::Utf8ToWide(
+    const char* utf8, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-char* StringUtils::WideToUtf8(wchar_t* str) {
+char* StringUtils::WideToUtf8(
+    wchar_t* str, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }
 
-const char* StringUtils::WideToUtf8(const wchar_t* str) {
+const char* StringUtils::WideToUtf8(
+    const wchar_t* str, intptr_t len, intptr_t* result_len) {
   UNIMPLEMENTED();
   return NULL;
 }