src: refactor to use locale functions

This makes the code more readable.

Signed-off-by: Darshan Sen <raisinten@gmail.com>

PR-URL: https://github.com/nodejs/node/pull/39014
Reviewed-By: Luigi Pinca <luigipinca@gmail.com>
Reviewed-By: Richard Lau <rlau@redhat.com>
Reviewed-By: James M Snell <jasnell@gmail.com>

1 files changed, 3 insertions, 2 deletions

diff --git a/src/util-inl.h b/src/util-inl.h
index 00a9f836e46..517da707170 100644
--- a/src/util-inl.h
+++ b/src/util-inl.h
@@ -26,6 +26,7 @@
 
 #include <cmath>
 #include <cstring>
+#include <locale>
 #include "util.h"
 
 // These are defined by <sys/byteorder.h> or <netinet/in.h> on some systems.
@@ -274,7 +275,7 @@ void SwapBytes64(char* data, size_t nbytes) {
 }
 
 char ToLower(char c) {
-  return c >= 'A' && c <= 'Z' ? c + ('a' - 'A') : c;
+  return std::tolower(c, std::locale::classic());
 }
 
 std::string ToLower(const std::string& in) {
@@ -285,7 +286,7 @@ std::string ToLower(const std::string& in) {
 }
 
 char ToUpper(char c) {
-  return c >= 'a' && c <= 'z' ? (c - 'a') + 'A' : c;
+  return std::toupper(c, std::locale::classic());
 }
 
 std::string ToUpper(const std::string& in) {