From d23bdae02415ebb35f1bf16fd3e323fa559ff49a Mon Sep 17 00:00:00 2001
From: casey langen <casey.langen@gmail.com>
Date: Mon, 26 Dec 2022 17:26:45 -0800
Subject: [PATCH] If _UNICODE is defined, WM_CHAR messages receive UTF16
 characters; in this case, we'll convert them to a UTF8 byte sequence and
 enqueue the characters individually.

---
 wingui/pdcscrn.c | 23 ++++++++++++++++++++++-
 1 file changed, 22 insertions(+), 1 deletion(-)

diff --git a/wingui/pdcscrn.c b/wingui/pdcscrn.c
index 67490747..8a6520e4 100644
--- a/wingui/pdcscrn.c
+++ b/wingui/pdcscrn.c
@@ -1919,7 +1919,28 @@ static LRESULT ALIGN_STACK CALLBACK WndProc (const HWND hwnd,
             exit( 0);
         if( wParam != 9 || !(GetKeyState( VK_SHIFT) & 0x8000))
             if( !key_already_handled)
-               add_key_to_queue( (int)wParam );
+#if _UNICODE
+                /* if we are building against the unicode runtime, key messages
+                received by WM_CHAR will be UTF16 encoded; convert it to a
+                sequence UTF8 bytes and inject them one at a time.
+                see: https://learn.microsoft.com/en-us/windows/win32/inputdev/wm-char */
+                wchar_t utf16[3]; /* may be a surrogate pair */
+                utf16[0] = LOWORD(wParam);
+                utf16[1] = HIWORD(wParam);
+                utf16[2] = 0;
+                unsigned char utf8[4 + 4 + 1];
+                int size = WideCharToMultiByte(CP_UTF8, 0, utf16, -1, 0, 0, 0, 0);
+                if (size > 0 && sizeof(utf8)) {
+                    utf8[0] = 0;
+                    WideCharToMultiByte(CP_UTF8, 0, utf16, -1, utf8, size, 0, 0);
+                    for (int i = 0; i < size - 1; i++) {
+                        add_key_to_queue((int) utf8[i]);
+                    }
+                }
+#else
+                add_key_to_queue((int)wParam);
+#endif
+            }
         key_already_handled = FALSE;
         return 0;