1 files changed, 102 insertions, 0 deletions
diff --git a/src/libs/3rdparty/winpty/misc/UnicodeDoubleWidthTest.cc b/src/libs/3rdparty/winpty/misc/UnicodeDoubleWidthTest.cc
new file mode 100644
index 0000000000..7210d41032
--- /dev/null
+++ b/src/libs/3rdparty/winpty/misc/UnicodeDoubleWidthTest.cc
@@ -0,0 +1,102 @@
+// Demonstrates how U+30FC is sometimes handled as a single-width character
+// when it should be handled as a double-width character.
+//
+// It only runs on computers where 932 is a valid code page.  Set the system
+// local to "Japanese (Japan)" to ensure this.
+//
+// The problem seems to happen when U+30FC is printed in a console using the
+// Lucida Console font, and only when that font is at certain sizes.
+//
+
+#include <windows.h>
+#include <assert.h>
+#include <locale.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "TestUtil.cc"
+
+#define COUNT_OF(x) (sizeof(x) / sizeof((x)[0]))
+
+static void setFont(const wchar_t *faceName, int pxSize) {
+    CONSOLE_FONT_INFOEX infoex = {0};
+    infoex.cbSize = sizeof(infoex);
+    infoex.dwFontSize.Y = pxSize;
+    wcsncpy(infoex.FaceName, faceName, COUNT_OF(infoex.FaceName));
+    BOOL ret = SetCurrentConsoleFontEx(
+        GetStdHandle(STD_OUTPUT_HANDLE), FALSE, &infoex);
+    assert(ret);
+}
+
+static bool performTest(const wchar_t testChar) {
+    const HANDLE conout = GetStdHandle(STD_OUTPUT_HANDLE);
+
+    SetConsoleTextAttribute(conout, 7);
+
+    system("cls");
+    DWORD actual = 0;
+    BOOL ret = WriteConsoleW(conout, &testChar, 1, &actual, NULL);
+    assert(ret && actual == 1);
+
+    CHAR_INFO verify[2];
+    COORD bufSize = {2, 1};
+    COORD bufCoord = {0, 0};
+    const SMALL_RECT readRegion = {0, 0, 1, 0};
+    SMALL_RECT actualRegion = readRegion;
+    ret = ReadConsoleOutputW(conout, verify, bufSize, bufCoord, &actualRegion);
+    assert(ret && !memcmp(&readRegion, &actualRegion, sizeof(readRegion)));
+    assert(verify[0].Char.UnicodeChar == testChar);
+
+    if (verify[1].Char.UnicodeChar == testChar) {
+        // Typical double-width behavior with a TrueType font.  Pass.
+        assert(verify[0].Attributes == 0x107);
+        assert(verify[1].Attributes == 0x207);
+        return true;
+    } else if (verify[1].Char.UnicodeChar == 0) {
+        // Typical double-width behavior with a Raster Font.  Pass.
+        assert(verify[0].Attributes == 7);
+        assert(verify[1].Attributes == 0);
+        return true;
+    } else if (verify[1].Char.UnicodeChar == L' ') {
+        // Single-width behavior.  Fail.
+        assert(verify[0].Attributes == 7);
+        assert(verify[1].Attributes == 7);
+        return false;
+    } else {
+        // Unexpected output.
+        assert(false);
+    }
+}
+
+int main(int argc, char *argv[]) {
+    setlocale(LC_ALL, "");
+    if (argc == 1) {
+        startChildProcess(L"CHILD");
+        return 0;
+    }
+
+    assert(SetConsoleCP(932));
+    assert(SetConsoleOutputCP(932));
+
+    const wchar_t testChar = 0x30FC;
+    const wchar_t *const faceNames[] = {
+        L"Lucida Console",
+        L"Consolas",
+        L"ＭＳ ゴシック",
+    };
+
+    trace("Test started");
+
+    for (auto faceName : faceNames) {
+        for (int px = 1; px <= 50; ++px) {
+            setFont(faceName, px);
+            if (!performTest(testChar)) {
+                trace("FAILURE: %s %dpx", narrowString(faceName).c_str(), px);
+            }
+        }
+    }
+
+    trace("Test complete");
+    return 0;
+}