--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/third_party/libuv/test/test-tty-duplicate-key.c	Wed Jan 14 19:39:52 2026 -0800
@@ -0,0 +1,381 @@
+/* Copyright libuv project contributors. All rights reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to
+ * deal in the Software without restriction, including without limitation the
+ * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
+ * sell copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifdef _WIN32
+
+#include "uv.h"
+#include "task.h"
+
+#include <errno.h>
+#include <io.h>
+#include <string.h>
+#include <windows.h>
+
+#define ESC "\x1b"
+#define EUR_UTF8 "\xe2\x82\xac"
+#define EUR_UNICODE 0x20AC
+
+
+const char* expect_str = NULL;
+ssize_t expect_nread = 0;
+
+static void dump_str(const char* str, ssize_t len) {
+  ssize_t i;
+  for (i = 0; i < len; i++) {
+    fprintf(stderr, "%#02x ", *(str + i));
+  }
+}
+
+static void print_err_msg(const char* expect, ssize_t expect_len,
+                          const char* found, ssize_t found_len) {
+  fprintf(stderr, "expect ");
+  dump_str(expect, expect_len);
+  fprintf(stderr, ", but found ");
+  dump_str(found, found_len);
+  fprintf(stderr, "\n");
+}
+
+static void tty_alloc(uv_handle_t* handle, size_t size, uv_buf_t* buf) {
+  buf->base = malloc(size);
+  ASSERT_NOT_NULL(buf->base);
+  buf->len = size;
+}
+
+static void tty_read(uv_stream_t* tty_in, ssize_t nread, const uv_buf_t* buf) {
+  if (nread > 0) {
+    if (nread != expect_nread) {
+      fprintf(stderr, "expected nread %ld, but found %ld\n",
+              (long)expect_nread, (long)nread);
+      print_err_msg(expect_str, expect_nread, buf->base, nread);
+      ASSERT(FALSE);
+    }
+    if (strncmp(buf->base, expect_str, nread) != 0) {
+      print_err_msg(expect_str, expect_nread, buf->base, nread);
+      ASSERT(FALSE);
+    }
+    uv_close((uv_handle_t*) tty_in, NULL);
+  } else {
+    ASSERT_OK(nread);
+  }
+}
+
+static void make_key_event_records(WORD virt_key, DWORD ctr_key_state,
+                                   BOOL is_wsl, INPUT_RECORD* records) {
+# define KEV(I) records[(I)].Event.KeyEvent
+  BYTE kb_state[256] = {0};
+  WCHAR buf[2];
+  int ret;
+
+  records[0].EventType = records[1].EventType = KEY_EVENT;
+  KEV(0).bKeyDown = TRUE;
+  KEV(1).bKeyDown = FALSE;
+  KEV(0).wVirtualKeyCode = KEV(1).wVirtualKeyCode = virt_key;
+  KEV(0).wRepeatCount = KEV(1).wRepeatCount = 1;
+  KEV(0).wVirtualScanCode = KEV(1).wVirtualScanCode =
+    MapVirtualKeyW(virt_key, MAPVK_VK_TO_VSC);
+  KEV(0).dwControlKeyState = KEV(1).dwControlKeyState = ctr_key_state;
+  if (ctr_key_state & LEFT_ALT_PRESSED) {
+    kb_state[VK_LMENU] = 0x01;
+  }
+  if (ctr_key_state & RIGHT_ALT_PRESSED) {
+    kb_state[VK_RMENU] = 0x01;
+  }
+  if (ctr_key_state & LEFT_CTRL_PRESSED) {
+    kb_state[VK_LCONTROL] = 0x01;
+  }
+  if (ctr_key_state & RIGHT_CTRL_PRESSED) {
+    kb_state[VK_RCONTROL] = 0x01;
+  }
+  if (ctr_key_state & SHIFT_PRESSED) {
+    kb_state[VK_SHIFT] = 0x01;
+  }
+  ret = ToUnicode(virt_key, KEV(0).wVirtualScanCode, kb_state, buf, 2, 0);
+  if (ret == 1) {
+    if(!is_wsl &&
+        ((ctr_key_state & LEFT_ALT_PRESSED) ||
+         (ctr_key_state & RIGHT_ALT_PRESSED))) {
+      /*
+       * If ALT key is pressed, the UnicodeChar value of the keyup event is
+       * set to 0 on nomal console. Emulate this behavior.
+       * See https://github.com/Microsoft/console/issues/320
+       */
+      KEV(0).uChar.UnicodeChar = buf[0];
+      KEV(1).uChar.UnicodeChar = 0;
+    } else{
+      /*
+       * In WSL UnicodeChar is normally set. This behavior cause #2111.
+       */
+      KEV(0).uChar.UnicodeChar = KEV(1).uChar.UnicodeChar = buf[0];
+    }
+  } else {
+    KEV(0).uChar.UnicodeChar = KEV(1).uChar.UnicodeChar = 0;
+  }
+# undef KEV
+}
+
+TEST_IMPL(tty_duplicate_vt100_fn_key_libuv) {
+  int r;
+  int ttyin_fd;
+  uv_tty_t tty_in;
+  uv_loop_t* loop;
+  HANDLE handle;
+  INPUT_RECORD records[2];
+  DWORD written;
+
+  loop = uv_default_loop();
+
+  /* Make sure we have an FD that refers to a tty */
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  ASSERT_PTR_NE(handle, INVALID_HANDLE_VALUE);
+  ttyin_fd = _open_osfhandle((intptr_t) handle, 0);
+  ASSERT_GE(ttyin_fd, 0);
+  ASSERT_EQ(UV_TTY, uv_guess_handle(ttyin_fd));
+
+  r = uv_tty_init(uv_default_loop(), &tty_in, ttyin_fd, 1);  /* Readable. */
+  ASSERT_OK(r);
+  ASSERT(uv_is_readable((uv_stream_t*) &tty_in));
+  ASSERT(!uv_is_writable((uv_stream_t*) &tty_in));
+
+  r = uv_read_start((uv_stream_t*)&tty_in, tty_alloc, tty_read);
+  ASSERT_OK(r);
+
+  /*
+   * libuv has chosen to emit ESC[[A, but other terminals, and even
+   * Windows itself use a different escape sequence, see the test below.
+   */
+  expect_str = ESC"[[A";
+  expect_nread = strlen(expect_str);
+
+  /* Turn on raw mode. */
+  r = uv_tty_set_mode(&tty_in, UV_TTY_MODE_RAW);
+  ASSERT_OK(r);
+
+  /*
+   * Send F1 keystrokes. Test of issue cause by #2114 that vt100 fn key
+   * duplicate.
+   */
+  make_key_event_records(VK_F1, 0, TRUE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tty_duplicate_vt100_fn_key_winvt) {
+  int r;
+  int ttyin_fd;
+  uv_tty_t tty_in;
+  uv_loop_t* loop;
+  HANDLE handle;
+  INPUT_RECORD records[2];
+  DWORD written;
+
+  loop = uv_default_loop();
+
+  /* Make sure we have an FD that refers to a tty */
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  ASSERT_PTR_NE(handle, INVALID_HANDLE_VALUE);
+  ttyin_fd = _open_osfhandle((intptr_t) handle, 0);
+  ASSERT_GE(ttyin_fd, 0);
+  ASSERT_EQ(UV_TTY, uv_guess_handle(ttyin_fd));
+
+  r = uv_tty_init(uv_default_loop(), &tty_in, ttyin_fd, 1);  /* Readable. */
+  ASSERT_OK(r);
+  ASSERT(uv_is_readable((uv_stream_t*) &tty_in));
+  ASSERT(!uv_is_writable((uv_stream_t*) &tty_in));
+
+  r = uv_read_start((uv_stream_t*)&tty_in, tty_alloc, tty_read);
+  ASSERT_OK(r);
+
+  /*
+   * Some keys, like F1, get are assigned a different value by Windows
+   * in ENABLE_VIRTUAL_TERMINAL_INPUT mode vs. libuv in the test above.
+   */
+  expect_str = ESC"OP";
+  expect_nread = strlen(expect_str);
+
+  /* Turn on raw mode. */
+  r = uv_tty_set_mode(&tty_in, UV_TTY_MODE_RAW_VT);
+  ASSERT_OK(r);
+
+  /*
+   * Send F1 keystroke.
+   */
+  make_key_event_records(VK_F1, 0, TRUE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tty_duplicate_alt_modifier_key) {
+  int r;
+  int ttyin_fd;
+  uv_tty_t tty_in;
+  uv_loop_t* loop;
+  HANDLE handle;
+  INPUT_RECORD records[2];
+  INPUT_RECORD alt_records[2];
+  DWORD written;
+
+  loop = uv_default_loop();
+
+  /* Make sure we have an FD that refers to a tty */
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  ASSERT_PTR_NE(handle, INVALID_HANDLE_VALUE);
+  ttyin_fd = _open_osfhandle((intptr_t) handle, 0);
+  ASSERT_GE(ttyin_fd, 0);
+  ASSERT_EQ(UV_TTY, uv_guess_handle(ttyin_fd));
+
+  r = uv_tty_init(uv_default_loop(), &tty_in, ttyin_fd, 1);  /* Readable. */
+  ASSERT_OK(r);
+  ASSERT(uv_is_readable((uv_stream_t*) &tty_in));
+  ASSERT(!uv_is_writable((uv_stream_t*) &tty_in));
+
+  r = uv_read_start((uv_stream_t*)&tty_in, tty_alloc, tty_read);
+  ASSERT_OK(r);
+
+  expect_str = ESC"a"ESC"a";
+  expect_nread = strlen(expect_str);
+
+  /* Turn on raw mode. */
+  r = uv_tty_set_mode(&tty_in, UV_TTY_MODE_RAW);
+  ASSERT_OK(r);
+
+  /* Emulate transmission of M-a at normal console */
+  make_key_event_records(VK_MENU, 0, TRUE, alt_records);
+  WriteConsoleInputW(handle, &alt_records[0], 1, &written);
+  ASSERT_EQ(1, written);
+  make_key_event_records(L'A', LEFT_ALT_PRESSED, FALSE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(2, written);
+  WriteConsoleInputW(handle, &alt_records[1], 1, &written);
+  ASSERT_EQ(1, written);
+
+  /* Emulate transmission of M-a at WSL(#2111) */
+  make_key_event_records(VK_MENU, 0, TRUE, alt_records);
+  WriteConsoleInputW(handle, &alt_records[0], 1, &written);
+  ASSERT_EQ(1, written);
+  make_key_event_records(L'A', LEFT_ALT_PRESSED, TRUE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(2, written);
+  WriteConsoleInputW(handle, &alt_records[1], 1, &written);
+  ASSERT_EQ(1, written);
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+TEST_IMPL(tty_composing_character) {
+  int r;
+  int ttyin_fd;
+  uv_tty_t tty_in;
+  uv_loop_t* loop;
+  HANDLE handle;
+  INPUT_RECORD records[2];
+  INPUT_RECORD alt_records[2];
+  DWORD written;
+
+  loop = uv_default_loop();
+
+  /* Make sure we have an FD that refers to a tty */
+  handle = CreateFileA("conin$",
+                       GENERIC_READ | GENERIC_WRITE,
+                       FILE_SHARE_READ | FILE_SHARE_WRITE,
+                       NULL,
+                       OPEN_EXISTING,
+                       FILE_ATTRIBUTE_NORMAL,
+                       NULL);
+  ASSERT_PTR_NE(handle, INVALID_HANDLE_VALUE);
+  ttyin_fd = _open_osfhandle((intptr_t) handle, 0);
+  ASSERT_GE(ttyin_fd, 0);
+  ASSERT_EQ(UV_TTY, uv_guess_handle(ttyin_fd));
+
+  r = uv_tty_init(uv_default_loop(), &tty_in, ttyin_fd, 1);  /* Readable. */
+  ASSERT_OK(r);
+  ASSERT(uv_is_readable((uv_stream_t*) &tty_in));
+  ASSERT(!uv_is_writable((uv_stream_t*) &tty_in));
+
+  r = uv_read_start((uv_stream_t*)&tty_in, tty_alloc, tty_read);
+  ASSERT_OK(r);
+
+  expect_str = EUR_UTF8;
+  expect_nread = strlen(expect_str);
+
+  /* Turn on raw mode. */
+  r = uv_tty_set_mode(&tty_in, UV_TTY_MODE_RAW);
+  ASSERT_OK(r);
+
+  /* Emulate EUR inputs by LEFT ALT+NUMPAD ASCII KeyComos */
+  make_key_event_records(VK_MENU, 0, FALSE, alt_records);
+  alt_records[1].Event.KeyEvent.uChar.UnicodeChar = EUR_UNICODE;
+  WriteConsoleInputW(handle, &alt_records[0], 1, &written);
+  make_key_event_records(VK_NUMPAD0, LEFT_ALT_PRESSED, FALSE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+  make_key_event_records(VK_NUMPAD1, LEFT_ALT_PRESSED, FALSE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+  make_key_event_records(VK_NUMPAD2, LEFT_ALT_PRESSED, FALSE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+  make_key_event_records(VK_NUMPAD8, LEFT_ALT_PRESSED, FALSE, records);
+  WriteConsoleInputW(handle, records, ARRAY_SIZE(records), &written);
+  ASSERT_EQ(written, ARRAY_SIZE(records));
+  WriteConsoleInputW(handle, &alt_records[1], 1, &written);
+
+  uv_run(loop, UV_RUN_DEFAULT);
+
+  MAKE_VALGRIND_HAPPY(loop);
+  return 0;
+}
+
+#else
+
+typedef int file_has_no_tests;  /* ISO C forbids an empty translation unit. */
+
+#endif  /* ifndef _WIN32 */