1 files changed, 8 insertions, 8 deletions
diff --git a/core/fxcrt/fx_extension.h b/core/fxcrt/fx_extension.h
index 8e9d06694f..0f249f89c8 100644
--- a/core/fxcrt/fx_extension.h
+++ b/core/fxcrt/fx_extension.h
@@ -26,20 +26,20 @@ float FXSYS_wcstof(const wchar_t* pwsStr,
 wchar_t* FXSYS_wcsncpy(wchar_t* dstStr, const wchar_t* srcStr, size_t count);
 int32_t FXSYS_wcsnicmp(const wchar_t* s1, const wchar_t* s2, size_t count);
 
-inline bool FXSYS_isASCIIlower(int32_t ch) {
-  return ch >= 'a' && ch <= 'z';
+inline bool FXSYS_iswlower(int32_t c) {
+  return u_islower(c);
 }
 
-inline bool FXSYS_isASCIIupper(int32_t ch) {
-  return ch >= 'A' && ch <= 'Z';
+inline bool FXSYS_iswupper(int32_t c) {
+  return u_isupper(c);
 }
 
-inline int32_t FXSYS_toASCIIlower(int32_t ch) {
-  return ch < 'A' || ch > 'Z' ? ch : (ch + 0x20);
+inline int32_t FXSYS_towlower(wchar_t c) {
+  return u_tolower(c);
 }
 
-inline int32_t FXSYS_toASCIIupper(int32_t ch) {
-  return ch < 'a' || ch > 'z' ? ch : (ch - 0x20);
+inline int32_t FXSYS_towupper(wchar_t c) {
+  return u_toupper(c);
 }
 
 inline bool FXSYS_iswalpha(wchar_t c) {