[Console] Fix Windows code page support

Author: orkan

Helper/QuestionHelper.php

@@ -108,11 +108,6 @@ private function doAsk(OutputInterface $output, Question $question)
         $inputStream = $this->inputStream ?: \STDIN;
         $autocomplete = $question->getAutocompleterCallback();
 
-        if (\function_exists('sapi_windows_cp_set')) {
-            // Codepage used by cmd.exe on Windows to allow special characters (éàüñ).
-            @sapi_windows_cp_set(1252);
-        }
-
         if (null === $autocomplete || !self::$stty || !Terminal::hasSttyAvailable()) {
             $ret = false;
             if ($question->isHidden()) {
@@ -127,7 +122,9 @@ private function doAsk(OutputInterface $output, Question $question)
             }
 
             if (false === $ret) {
+                $cp = $this->setIOCodepage();
                 $ret = fgets($inputStream, 4096);
+                $ret = $this->resetIOCodepage($cp, $ret);
                 if (false === $ret) {
                     throw new MissingInputException('Aborted.');
                 }
@@ -503,4 +500,41 @@ private function isInteractiveInput($inputStream): bool
 
         return self::$stdinIsInteractive = 1 !== $status;
     }
+
+    /**
+     * Sets console I/O to the host code page.
+     *
+     * @return int Previous code page in IBM/EBCDIC format
+     */
+    private function setIOCodepage(): int
+    {
+        if (\function_exists('sapi_windows_cp_set')) {
+            $cp = sapi_windows_cp_get();
+            sapi_windows_cp_set(sapi_windows_cp_get('oem'));
+
+            return $cp;
+        }
+
+        return 0;
+    }
+
+    /**
+     * Sets console I/O to the specified code page and converts the user input.
+     *
+     * @param string|false $input
+     *
+     * @return string|false
+     */
+    private function resetIOCodepage(int $cp, $input)
+    {
+        if (0 !== $cp) {
+            sapi_windows_cp_set($cp);
+
+            if (false !== $input && '' !== $input) {
+                $input = sapi_windows_cp_conv(sapi_windows_cp_get('oem'), $cp, $input);
+            }
+        }
+
+        return $input;
+    }
 }