1 files changed, 89 insertions, 0 deletions
diff --git a/test/setlocale.c b/test/setlocale.c
new file mode 100644
index 0000000..005f0fb
--- /dev/null
+++ b/test/setlocale.c
@@ -0,0 +1,89 @@
+#include <stdio.h>
+#include <fcntl.h>
+#include <windows.h>
+#include <locale.h>
+
+/*
+
+ This program proves that when you set the locale to "", the Chinese ANSI CP936
+ encoded text is printed wrongly in a simplified Chinese regional setting.
+ UTF-8 is also printed wrongly.
+
+To test this program you first need to change the Windows locale setting to
+simplified Chinese. There is no problem doing that, because the "display
+language" will stay the original language, and you can still use your Windows.
+
+Control Panel > Region and Language > Administrative > Change system locale
+
+Select simplified Chinese and reboot your PC.
+
+For example output see setlocale.png.
+
+ */
+
+print_string(const char* str, const char* ustr, const wchar_t *wstr) {
+  int prevmode;
+  UINT outputCP;
+  int utf8 = 0;
+
+  /* Set utf8 to 1 to print UTF-8 text.
+     If you print both UTF-16 en UTF-8 in one program the console gets
+     mixed up. When the UTF-8 is printed after UTF-16 the UTF-16 text
+     is displayed wrongly.
+   */ 
+
+  if ( ! utf8 ) {
+    /* When the locale is set to "" the following line will produce wrong output */
+      printf ("ANSI CP936 %s\n",str);
+
+    /* UTF-16 will produce correct output in all cases. */
+      prevmode = _setmode(_fileno(stdout), _O_U16TEXT);
+      wprintf(L"UTF-16    %ls\n",wstr);
+      _setmode(_fileno(stdout), prevmode);
+   } else {
+
+    /* UTF-8 will produce wrong output when the locale is "".
+       When the locale is "C" wrong output with raster font, and correct output
+       with TrueType font. */
+      outputCP = GetConsoleOutputCP();
+      SetConsoleOutputCP(CP_UTF8);
+      wprintf(L"UTF-8     %S\n",ustr);
+      SetConsoleOutputCP(outputCP);
+
+    /* The code below produces wrong output in all cases */
+    //  prevmode = _setmode(_fileno(stdout), _O_U8TEXT);
+    //  wprintf(L"UTF-8     %S",ustr);
+    //  _setmode(_fileno(stdout), prevmode);
+   }
+
+}
+
+int main() {
+
+  char str[5];      /* ANSI CP936 */
+  char ustr[15];    /* UTF-8 */
+  wchar_t wstr[10]; /* UTF-16 */
+
+/* Create ANSI CP936 string (meaning: Western-European). */
+  str[0] = 0xce;
+  str[1] = 0xf7;
+  str[2] = 0xc5;
+  str[3] = 0xb7;
+  str[4] = '\0';
+/* Convert CP936 to UTF-16. */
+  MultiByteToWideChar(936, 0, str, -1, wstr, sizeof(wstr));
+/* Convert UTF-16 to UTF-8 */
+  WideCharToMultiByte(CP_UTF8, 0, wstr, -1, ustr, sizeof(ustr), NULL, NULL);
+
+
+
+  setlocale (LC_ALL, "");
+  printf("==> setlocale (LC_ALL, \"\");\n");
+  print_string(str, ustr, wstr);
+
+  setlocale (LC_ALL, "C");
+  printf("\n==> setlocale (LC_ALL, \"C\");\n");
+  print_string(str, ustr, wstr);
+
+  return  0;
+}