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-rw-r--r--libguile/posix-w32.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/libguile/posix-w32.c b/libguile/posix-w32.c
index 5f6c0b759..239fd1156 100644
--- a/libguile/posix-w32.c
+++ b/libguile/posix-w32.c
@@ -289,6 +289,54 @@ dlerror_w32 ()
snprintf (dlerror_str, DLERROR_LEN, "error %ld: %s", (long) dw, msg_buf);
return dlerror_str;
}
+
+/* Check for the Windows 11 bug where there's a return character in the
+ * console input queue despite draining the input. */
+int
+console_has_return_keyevent_w32 (int fdes)
+{
+ HANDLE h;
+ DWORD mode;
+
+ h = (HANDLE) _get_osfhandle (fdes);
+ if (h == -1)
+ return 0;
+ if (GetConsoleMode (h, &mode) == 0)
+ return 0;
+
+ // Rarely need more than 1 INPUT_RECORD for this test, but just in
+ // case there is a mouse event in the queue.
+#define NBUFFER 8
+ INPUT_RECORD irbuffer[NBUFFER];
+ BOOL bRet;
+ DWORD avail;
+ int i;
+ int n_chars = 0;
+ int n_returns = 0;
+
+ while (1)
+ {
+ bRet = PeekConsoleInput (h, irbuffer, NBUFFER, &avail);
+ if (!bRet || avail == 0)
+ break;
+
+ for (i = 0; i < avail; i++)
+ if (irbuffer[i].EventType == KEY_EVENT)
+ {
+ n_chars ++;
+ if (irbuffer[i].Event.KeyEvent.uChar.AsciiChar == 13)
+ n_returns ++;
+ }
+ if (avail < NBUFFER)
+ break;
+ }
+
+ if (n_chars == 1 && n_returns == 1)
+ return 1;
+ return 0;
+#undef NBUFFER
+}
+
int
getpagesize_w32 (void)
{