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tty.c
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tty.c
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/* Copyright Joyent, Inc. and other Node 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.
*/
#include <assert.h>
#include <io.h>
#include <string.h>
#include <stdlib.h>
#if defined(_MSC_VER) && _MSC_VER < 1600
# include "uv/stdint-msvc2008.h"
#else
# include <stdint.h>
#endif
#ifndef COMMON_LVB_REVERSE_VIDEO
# define COMMON_LVB_REVERSE_VIDEO 0x4000
#endif
#include "uv.h"
#include "internal.h"
#include "handle-inl.h"
#include "stream-inl.h"
#include "req-inl.h"
#ifndef InterlockedOr
# define InterlockedOr _InterlockedOr
#endif
#define UNICODE_REPLACEMENT_CHARACTER (0xfffd)
#define ANSI_NORMAL 0x00
#define ANSI_ESCAPE_SEEN 0x02
#define ANSI_CSI 0x04
#define ANSI_ST_CONTROL 0x08
#define ANSI_IGNORE 0x10
#define ANSI_IN_ARG 0x20
#define ANSI_IN_STRING 0x40
#define ANSI_BACKSLASH_SEEN 0x80
#define MAX_INPUT_BUFFER_LENGTH 8192
#define MAX_CONSOLE_CHAR 8192
#ifndef ENABLE_VIRTUAL_TERMINAL_PROCESSING
#define ENABLE_VIRTUAL_TERMINAL_PROCESSING 0x0004
#endif
static void uv_tty_capture_initial_style(CONSOLE_SCREEN_BUFFER_INFO* info);
static void uv_tty_update_virtual_window(CONSOLE_SCREEN_BUFFER_INFO* info);
static int uv__cancel_read_console(uv_tty_t* handle);
/* Null uv_buf_t */
static const uv_buf_t uv_null_buf_ = { 0, NULL };
enum uv__read_console_status_e {
NOT_STARTED,
IN_PROGRESS,
TRAP_REQUESTED,
COMPLETED
};
static volatile LONG uv__read_console_status = NOT_STARTED;
static volatile LONG uv__restore_screen_state;
static CONSOLE_SCREEN_BUFFER_INFO uv__saved_screen_state;
/*
* The console virtual window.
*
* Normally cursor movement in windows is relative to the console screen buffer,
* e.g. the application is allowed to overwrite the 'history'. This is very
* inconvenient, it makes absolute cursor movement pretty useless. There is
* also the concept of 'client rect' which is defined by the actual size of
* the console window and the scroll position of the screen buffer, but it's
* very volatile because it changes when the user scrolls.
*
* To make cursor movement behave sensibly we define a virtual window to which
* cursor movement is confined. The virtual window is always as wide as the
* console screen buffer, but it's height is defined by the size of the
* console window. The top of the virtual window aligns with the position
* of the caret when the first stdout/err handle is created, unless that would
* mean that it would extend beyond the bottom of the screen buffer - in that
* that case it's located as far down as possible.
*
* When the user writes a long text or many newlines, such that the output
* reaches beyond the bottom of the virtual window, the virtual window is
* shifted downwards, but not resized.
*
* Since all tty i/o happens on the same console, this window is shared
* between all stdout/stderr handles.
*/
static int uv_tty_virtual_offset = -1;
static int uv_tty_virtual_height = -1;
static int uv_tty_virtual_width = -1;
/* The console window size
* We keep this separate from uv_tty_virtual_*. We use those values to only
* handle signalling SIGWINCH
*/
static HANDLE uv__tty_console_handle = INVALID_HANDLE_VALUE;
static int uv__tty_console_height = -1;
static int uv__tty_console_width = -1;
static DWORD WINAPI uv__tty_console_resize_message_loop_thread(void* param);
static void CALLBACK uv__tty_console_resize_event(HWINEVENTHOOK hWinEventHook,
DWORD event,
HWND hwnd,
LONG idObject,
LONG idChild,
DWORD dwEventThread,
DWORD dwmsEventTime);
/* We use a semaphore rather than a mutex or critical section because in some
cases (uv__cancel_read_console) we need take the lock in the main thread and
release it in another thread. Using a semaphore ensures that in such
scenario the main thread will still block when trying to acquire the lock. */
static uv_sem_t uv_tty_output_lock;
static WORD uv_tty_default_text_attributes =
FOREGROUND_RED | FOREGROUND_GREEN | FOREGROUND_BLUE;
static char uv_tty_default_fg_color = 7;
static char uv_tty_default_bg_color = 0;
static char uv_tty_default_fg_bright = 0;
static char uv_tty_default_bg_bright = 0;
static char uv_tty_default_inverse = 0;
typedef enum {
UV_SUPPORTED,
UV_UNCHECKED,
UV_UNSUPPORTED
} uv_vtermstate_t;
/* Determine whether or not ANSI support is enabled. */
static uv_vtermstate_t uv__vterm_state = UV_UNCHECKED;
static void uv__determine_vterm_state(HANDLE handle);
void uv_console_init(void) {
if (uv_sem_init(&uv_tty_output_lock, 1))
abort();
uv__tty_console_handle = CreateFileW(L"CONOUT$",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_WRITE,
0,
OPEN_EXISTING,
0,
0);
if (uv__tty_console_handle != NULL) {
QueueUserWorkItem(uv__tty_console_resize_message_loop_thread,
NULL,
WT_EXECUTELONGFUNCTION);
}
}
int uv_tty_init(uv_loop_t* loop, uv_tty_t* tty, uv_file fd, int readable) {
HANDLE handle;
CONSOLE_SCREEN_BUFFER_INFO screen_buffer_info;
uv__once_init();
handle = (HANDLE) uv__get_osfhandle(fd);
if (handle == INVALID_HANDLE_VALUE)
return UV_EBADF;
if (fd <= 2) {
/* In order to avoid closing a stdio file descriptor 0-2, duplicate the
* underlying OS handle and forget about the original fd.
* We could also opt to use the original OS handle and just never close it,
* but then there would be no reliable way to cancel pending read operations
* upon close.
*/
if (!DuplicateHandle(INVALID_HANDLE_VALUE,
handle,
INVALID_HANDLE_VALUE,
&handle,
0,
FALSE,
DUPLICATE_SAME_ACCESS))
return uv_translate_sys_error(GetLastError());
fd = -1;
}
if (!readable) {
/* Obtain the screen buffer info with the output handle. */
if (!GetConsoleScreenBufferInfo(handle, &screen_buffer_info)) {
return uv_translate_sys_error(GetLastError());
}
/* Obtain the tty_output_lock because the virtual window state is shared
* between all uv_tty_t handles. */
uv_sem_wait(&uv_tty_output_lock);
if (uv__vterm_state == UV_UNCHECKED)
uv__determine_vterm_state(handle);
/* Remember the original console text attributes. */
uv_tty_capture_initial_style(&screen_buffer_info);
uv_tty_update_virtual_window(&screen_buffer_info);
uv_sem_post(&uv_tty_output_lock);
}
uv_stream_init(loop, (uv_stream_t*) tty, UV_TTY);
uv_connection_init((uv_stream_t*) tty);
tty->handle = handle;
tty->u.fd = fd;
tty->reqs_pending = 0;
tty->flags |= UV_HANDLE_BOUND;
if (readable) {
/* Initialize TTY input specific fields. */
tty->flags |= UV_HANDLE_TTY_READABLE | UV_HANDLE_READABLE;
/* TODO: remove me in v2.x. */
tty->tty.rd.unused_ = NULL;
tty->tty.rd.read_line_buffer = uv_null_buf_;
tty->tty.rd.read_raw_wait = NULL;
/* Init keycode-to-vt100 mapper state. */
tty->tty.rd.last_key_len = 0;
tty->tty.rd.last_key_offset = 0;
tty->tty.rd.last_utf16_high_surrogate = 0;
memset(&tty->tty.rd.last_input_record, 0, sizeof tty->tty.rd.last_input_record);
} else {
/* TTY output specific fields. */
tty->flags |= UV_HANDLE_WRITABLE;
/* Init utf8-to-utf16 conversion state. */
tty->tty.wr.utf8_bytes_left = 0;
tty->tty.wr.utf8_codepoint = 0;
/* Initialize eol conversion state */
tty->tty.wr.previous_eol = 0;
/* Init ANSI parser state. */
tty->tty.wr.ansi_parser_state = ANSI_NORMAL;
}
return 0;
}
/* Set the default console text attributes based on how the console was
* configured when libuv started.
*/
static void uv_tty_capture_initial_style(CONSOLE_SCREEN_BUFFER_INFO* info) {
static int style_captured = 0;
/* Only do this once.
Assumption: Caller has acquired uv_tty_output_lock. */
if (style_captured)
return;
/* Save raw win32 attributes. */
uv_tty_default_text_attributes = info->wAttributes;
/* Convert black text on black background to use white text. */
if (uv_tty_default_text_attributes == 0)
uv_tty_default_text_attributes = 7;
/* Convert Win32 attributes to ANSI colors. */
uv_tty_default_fg_color = 0;
uv_tty_default_bg_color = 0;
uv_tty_default_fg_bright = 0;
uv_tty_default_bg_bright = 0;
uv_tty_default_inverse = 0;
if (uv_tty_default_text_attributes & FOREGROUND_RED)
uv_tty_default_fg_color |= 1;
if (uv_tty_default_text_attributes & FOREGROUND_GREEN)
uv_tty_default_fg_color |= 2;
if (uv_tty_default_text_attributes & FOREGROUND_BLUE)
uv_tty_default_fg_color |= 4;
if (uv_tty_default_text_attributes & BACKGROUND_RED)
uv_tty_default_bg_color |= 1;
if (uv_tty_default_text_attributes & BACKGROUND_GREEN)
uv_tty_default_bg_color |= 2;
if (uv_tty_default_text_attributes & BACKGROUND_BLUE)
uv_tty_default_bg_color |= 4;
if (uv_tty_default_text_attributes & FOREGROUND_INTENSITY)
uv_tty_default_fg_bright = 1;
if (uv_tty_default_text_attributes & BACKGROUND_INTENSITY)
uv_tty_default_bg_bright = 1;
if (uv_tty_default_text_attributes & COMMON_LVB_REVERSE_VIDEO)
uv_tty_default_inverse = 1;
style_captured = 1;
}
int uv_tty_set_mode(uv_tty_t* tty, uv_tty_mode_t mode) {
DWORD flags;
unsigned char was_reading;
uv_alloc_cb alloc_cb;
uv_read_cb read_cb;
int err;
if (!(tty->flags & UV_HANDLE_TTY_READABLE)) {
return UV_EINVAL;
}
if (!!mode == !!(tty->flags & UV_HANDLE_TTY_RAW)) {
return 0;
}
switch (mode) {
case UV_TTY_MODE_NORMAL:
flags = ENABLE_ECHO_INPUT | ENABLE_LINE_INPUT | ENABLE_PROCESSED_INPUT;
break;
case UV_TTY_MODE_RAW:
flags = ENABLE_WINDOW_INPUT;
break;
case UV_TTY_MODE_IO:
return UV_ENOTSUP;
default:
return UV_EINVAL;
}
/* If currently reading, stop, and restart reading. */
if (tty->flags & UV_HANDLE_READING) {
was_reading = 1;
alloc_cb = tty->alloc_cb;
read_cb = tty->read_cb;
err = uv_tty_read_stop(tty);
if (err) {
return uv_translate_sys_error(err);
}
} else {
was_reading = 0;
}
uv_sem_wait(&uv_tty_output_lock);
if (!SetConsoleMode(tty->handle, flags)) {
err = uv_translate_sys_error(GetLastError());
uv_sem_post(&uv_tty_output_lock);
return err;
}
uv_sem_post(&uv_tty_output_lock);
/* Update flag. */
tty->flags &= ~UV_HANDLE_TTY_RAW;
tty->flags |= mode ? UV_HANDLE_TTY_RAW : 0;
/* If we just stopped reading, restart. */
if (was_reading) {
err = uv_tty_read_start(tty, alloc_cb, read_cb);
if (err) {
return uv_translate_sys_error(err);
}
}
return 0;
}
int uv_is_tty(uv_file file) {
DWORD result;
return GetConsoleMode((HANDLE) _get_osfhandle(file), &result) != 0;
}
int uv_tty_get_winsize(uv_tty_t* tty, int* width, int* height) {
CONSOLE_SCREEN_BUFFER_INFO info;
if (!GetConsoleScreenBufferInfo(tty->handle, &info)) {
return uv_translate_sys_error(GetLastError());
}
uv_sem_wait(&uv_tty_output_lock);
uv_tty_update_virtual_window(&info);
uv_sem_post(&uv_tty_output_lock);
*width = uv_tty_virtual_width;
*height = uv_tty_virtual_height;
return 0;
}
static void CALLBACK uv_tty_post_raw_read(void* data, BOOLEAN didTimeout) {
uv_loop_t* loop;
uv_tty_t* handle;
uv_req_t* req;
assert(data);
assert(!didTimeout);
req = (uv_req_t*) data;
handle = (uv_tty_t*) req->data;
loop = handle->loop;
UnregisterWait(handle->tty.rd.read_raw_wait);
handle->tty.rd.read_raw_wait = NULL;
SET_REQ_SUCCESS(req);
POST_COMPLETION_FOR_REQ(loop, req);
}
static void uv_tty_queue_read_raw(uv_loop_t* loop, uv_tty_t* handle) {
uv_read_t* req;
BOOL r;
assert(handle->flags & UV_HANDLE_READING);
assert(!(handle->flags & UV_HANDLE_READ_PENDING));
assert(handle->handle && handle->handle != INVALID_HANDLE_VALUE);
handle->tty.rd.read_line_buffer = uv_null_buf_;
req = &handle->read_req;
memset(&req->u.io.overlapped, 0, sizeof(req->u.io.overlapped));
r = RegisterWaitForSingleObject(&handle->tty.rd.read_raw_wait,
handle->handle,
uv_tty_post_raw_read,
(void*) req,
INFINITE,
WT_EXECUTEINWAITTHREAD | WT_EXECUTEONLYONCE);
if (!r) {
handle->tty.rd.read_raw_wait = NULL;
SET_REQ_ERROR(req, GetLastError());
uv_insert_pending_req(loop, (uv_req_t*)req);
}
handle->flags |= UV_HANDLE_READ_PENDING;
handle->reqs_pending++;
}
static DWORD CALLBACK uv_tty_line_read_thread(void* data) {
uv_loop_t* loop;
uv_tty_t* handle;
uv_req_t* req;
DWORD bytes, read_bytes;
WCHAR utf16[MAX_INPUT_BUFFER_LENGTH / 3];
DWORD chars, read_chars;
LONG status;
COORD pos;
BOOL read_console_success;
assert(data);
req = (uv_req_t*) data;
handle = (uv_tty_t*) req->data;
loop = handle->loop;
assert(handle->tty.rd.read_line_buffer.base != NULL);
assert(handle->tty.rd.read_line_buffer.len > 0);
/* ReadConsole can't handle big buffers. */
if (handle->tty.rd.read_line_buffer.len < MAX_INPUT_BUFFER_LENGTH) {
bytes = handle->tty.rd.read_line_buffer.len;
} else {
bytes = MAX_INPUT_BUFFER_LENGTH;
}
/* At last, unicode! One utf-16 codeunit never takes more than 3 utf-8
* codeunits to encode. */
chars = bytes / 3;
status = InterlockedExchange(&uv__read_console_status, IN_PROGRESS);
if (status == TRAP_REQUESTED) {
SET_REQ_SUCCESS(req);
req->u.io.overlapped.InternalHigh = 0;
POST_COMPLETION_FOR_REQ(loop, req);
return 0;
}
read_console_success = ReadConsoleW(handle->handle,
(void*) utf16,
chars,
&read_chars,
NULL);
if (read_console_success) {
read_bytes = WideCharToMultiByte(CP_UTF8,
0,
utf16,
read_chars,
handle->tty.rd.read_line_buffer.base,
bytes,
NULL,
NULL);
SET_REQ_SUCCESS(req);
req->u.io.overlapped.InternalHigh = read_bytes;
} else {
SET_REQ_ERROR(req, GetLastError());
}
status = InterlockedExchange(&uv__read_console_status, COMPLETED);
if (status == TRAP_REQUESTED) {
/* If we canceled the read by sending a VK_RETURN event, restore the
screen state to undo the visual effect of the VK_RETURN */
if (read_console_success && InterlockedOr(&uv__restore_screen_state, 0)) {
HANDLE active_screen_buffer;
active_screen_buffer = CreateFileA("conout$",
GENERIC_READ | GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
NULL);
if (active_screen_buffer != INVALID_HANDLE_VALUE) {
pos = uv__saved_screen_state.dwCursorPosition;
/* If the cursor was at the bottom line of the screen buffer, the
VK_RETURN would have caused the buffer contents to scroll up by one
line. The right position to reset the cursor to is therefore one line
higher */
if (pos.Y == uv__saved_screen_state.dwSize.Y - 1)
pos.Y--;
SetConsoleCursorPosition(active_screen_buffer, pos);
CloseHandle(active_screen_buffer);
}
}
uv_sem_post(&uv_tty_output_lock);
}
POST_COMPLETION_FOR_REQ(loop, req);
return 0;
}
static void uv_tty_queue_read_line(uv_loop_t* loop, uv_tty_t* handle) {
uv_read_t* req;
BOOL r;
assert(handle->flags & UV_HANDLE_READING);
assert(!(handle->flags & UV_HANDLE_READ_PENDING));
assert(handle->handle && handle->handle != INVALID_HANDLE_VALUE);
req = &handle->read_req;
memset(&req->u.io.overlapped, 0, sizeof(req->u.io.overlapped));
handle->tty.rd.read_line_buffer = uv_buf_init(NULL, 0);
handle->alloc_cb((uv_handle_t*) handle, 8192, &handle->tty.rd.read_line_buffer);
if (handle->tty.rd.read_line_buffer.base == NULL ||
handle->tty.rd.read_line_buffer.len == 0) {
handle->read_cb((uv_stream_t*) handle,
UV_ENOBUFS,
&handle->tty.rd.read_line_buffer);
return;
}
assert(handle->tty.rd.read_line_buffer.base != NULL);
/* Reset flags No locking is required since there cannot be a line read
in progress. We are also relying on the memory barrier provided by
QueueUserWorkItem*/
uv__restore_screen_state = FALSE;
uv__read_console_status = NOT_STARTED;
r = QueueUserWorkItem(uv_tty_line_read_thread,
(void*) req,
WT_EXECUTELONGFUNCTION);
if (!r) {
SET_REQ_ERROR(req, GetLastError());
uv_insert_pending_req(loop, (uv_req_t*)req);
}
handle->flags |= UV_HANDLE_READ_PENDING;
handle->reqs_pending++;
}
static void uv_tty_queue_read(uv_loop_t* loop, uv_tty_t* handle) {
if (handle->flags & UV_HANDLE_TTY_RAW) {
uv_tty_queue_read_raw(loop, handle);
} else {
uv_tty_queue_read_line(loop, handle);
}
}
static const char* get_vt100_fn_key(DWORD code, char shift, char ctrl,
size_t* len) {
#define VK_CASE(vk, normal_str, shift_str, ctrl_str, shift_ctrl_str) \
case (vk): \
if (shift && ctrl) { \
*len = sizeof shift_ctrl_str; \
return "\033" shift_ctrl_str; \
} else if (shift) { \
*len = sizeof shift_str ; \
return "\033" shift_str; \
} else if (ctrl) { \
*len = sizeof ctrl_str; \
return "\033" ctrl_str; \
} else { \
*len = sizeof normal_str; \
return "\033" normal_str; \
}
switch (code) {
/* These mappings are the same as Cygwin's. Unmodified and alt-modified
* keypad keys comply with linux console, modifiers comply with xterm
* modifier usage. F1. f12 and shift-f1. f10 comply with linux console, f6.
* f12 with and without modifiers comply with rxvt. */
VK_CASE(VK_INSERT, "[2~", "[2;2~", "[2;5~", "[2;6~")
VK_CASE(VK_END, "[4~", "[4;2~", "[4;5~", "[4;6~")
VK_CASE(VK_DOWN, "[B", "[1;2B", "[1;5B", "[1;6B")
VK_CASE(VK_NEXT, "[6~", "[6;2~", "[6;5~", "[6;6~")
VK_CASE(VK_LEFT, "[D", "[1;2D", "[1;5D", "[1;6D")
VK_CASE(VK_CLEAR, "[G", "[1;2G", "[1;5G", "[1;6G")
VK_CASE(VK_RIGHT, "[C", "[1;2C", "[1;5C", "[1;6C")
VK_CASE(VK_UP, "[A", "[1;2A", "[1;5A", "[1;6A")
VK_CASE(VK_HOME, "[1~", "[1;2~", "[1;5~", "[1;6~")
VK_CASE(VK_PRIOR, "[5~", "[5;2~", "[5;5~", "[5;6~")
VK_CASE(VK_DELETE, "[3~", "[3;2~", "[3;5~", "[3;6~")
VK_CASE(VK_NUMPAD0, "[2~", "[2;2~", "[2;5~", "[2;6~")
VK_CASE(VK_NUMPAD1, "[4~", "[4;2~", "[4;5~", "[4;6~")
VK_CASE(VK_NUMPAD2, "[B", "[1;2B", "[1;5B", "[1;6B")
VK_CASE(VK_NUMPAD3, "[6~", "[6;2~", "[6;5~", "[6;6~")
VK_CASE(VK_NUMPAD4, "[D", "[1;2D", "[1;5D", "[1;6D")
VK_CASE(VK_NUMPAD5, "[G", "[1;2G", "[1;5G", "[1;6G")
VK_CASE(VK_NUMPAD6, "[C", "[1;2C", "[1;5C", "[1;6C")
VK_CASE(VK_NUMPAD7, "[A", "[1;2A", "[1;5A", "[1;6A")
VK_CASE(VK_NUMPAD8, "[1~", "[1;2~", "[1;5~", "[1;6~")
VK_CASE(VK_NUMPAD9, "[5~", "[5;2~", "[5;5~", "[5;6~")
VK_CASE(VK_DECIMAL, "[3~", "[3;2~", "[3;5~", "[3;6~")
VK_CASE(VK_F1, "[[A", "[23~", "[11^", "[23^" )
VK_CASE(VK_F2, "[[B", "[24~", "[12^", "[24^" )
VK_CASE(VK_F3, "[[C", "[25~", "[13^", "[25^" )
VK_CASE(VK_F4, "[[D", "[26~", "[14^", "[26^" )
VK_CASE(VK_F5, "[[E", "[28~", "[15^", "[28^" )
VK_CASE(VK_F6, "[17~", "[29~", "[17^", "[29^" )
VK_CASE(VK_F7, "[18~", "[31~", "[18^", "[31^" )
VK_CASE(VK_F8, "[19~", "[32~", "[19^", "[32^" )
VK_CASE(VK_F9, "[20~", "[33~", "[20^", "[33^" )
VK_CASE(VK_F10, "[21~", "[34~", "[21^", "[34^" )
VK_CASE(VK_F11, "[23~", "[23$", "[23^", "[23@" )
VK_CASE(VK_F12, "[24~", "[24$", "[24^", "[24@" )
default:
*len = 0;
return NULL;
}
#undef VK_CASE
}
void uv_process_tty_read_raw_req(uv_loop_t* loop, uv_tty_t* handle,
uv_req_t* req) {
/* Shortcut for handle->tty.rd.last_input_record.Event.KeyEvent. */
#define KEV handle->tty.rd.last_input_record.Event.KeyEvent
DWORD records_left, records_read;
uv_buf_t buf;
off_t buf_used;
assert(handle->type == UV_TTY);
assert(handle->flags & UV_HANDLE_TTY_READABLE);
handle->flags &= ~UV_HANDLE_READ_PENDING;
if (!(handle->flags & UV_HANDLE_READING) ||
!(handle->flags & UV_HANDLE_TTY_RAW)) {
goto out;
}
if (!REQ_SUCCESS(req)) {
/* An error occurred while waiting for the event. */
if ((handle->flags & UV_HANDLE_READING)) {
handle->flags &= ~UV_HANDLE_READING;
handle->read_cb((uv_stream_t*)handle,
uv_translate_sys_error(GET_REQ_ERROR(req)),
&uv_null_buf_);
}
goto out;
}
/* Fetch the number of events */
if (!GetNumberOfConsoleInputEvents(handle->handle, &records_left)) {
handle->flags &= ~UV_HANDLE_READING;
DECREASE_ACTIVE_COUNT(loop, handle);
handle->read_cb((uv_stream_t*)handle,
uv_translate_sys_error(GetLastError()),
&uv_null_buf_);
goto out;
}
/* Windows sends a lot of events that we're not interested in, so buf will be
* allocated on demand, when there's actually something to emit. */
buf = uv_null_buf_;
buf_used = 0;
while ((records_left > 0 || handle->tty.rd.last_key_len > 0) &&
(handle->flags & UV_HANDLE_READING)) {
if (handle->tty.rd.last_key_len == 0) {
/* Read the next input record */
if (!ReadConsoleInputW(handle->handle,
&handle->tty.rd.last_input_record,
1,
&records_read)) {
handle->flags &= ~UV_HANDLE_READING;
DECREASE_ACTIVE_COUNT(loop, handle);
handle->read_cb((uv_stream_t*) handle,
uv_translate_sys_error(GetLastError()),
&buf);
goto out;
}
records_left--;
/* Ignore other events that are not key events. */
if (handle->tty.rd.last_input_record.EventType != KEY_EVENT) {
continue;
}
/* Ignore keyup events, unless the left alt key was held and a valid
* unicode character was emitted. */
if (!KEV.bKeyDown && !(((KEV.dwControlKeyState & LEFT_ALT_PRESSED) ||
KEV.wVirtualKeyCode==VK_MENU) && KEV.uChar.UnicodeChar != 0)) {
continue;
}
/* Ignore keypresses to numpad number keys if the left alt is held
* because the user is composing a character, or windows simulating this.
*/
if ((KEV.dwControlKeyState & LEFT_ALT_PRESSED) &&
!(KEV.dwControlKeyState & ENHANCED_KEY) &&
(KEV.wVirtualKeyCode == VK_INSERT ||
KEV.wVirtualKeyCode == VK_END ||
KEV.wVirtualKeyCode == VK_DOWN ||
KEV.wVirtualKeyCode == VK_NEXT ||
KEV.wVirtualKeyCode == VK_LEFT ||
KEV.wVirtualKeyCode == VK_CLEAR ||
KEV.wVirtualKeyCode == VK_RIGHT ||
KEV.wVirtualKeyCode == VK_HOME ||
KEV.wVirtualKeyCode == VK_UP ||
KEV.wVirtualKeyCode == VK_PRIOR ||
KEV.wVirtualKeyCode == VK_NUMPAD0 ||
KEV.wVirtualKeyCode == VK_NUMPAD1 ||
KEV.wVirtualKeyCode == VK_NUMPAD2 ||
KEV.wVirtualKeyCode == VK_NUMPAD3 ||
KEV.wVirtualKeyCode == VK_NUMPAD4 ||
KEV.wVirtualKeyCode == VK_NUMPAD5 ||
KEV.wVirtualKeyCode == VK_NUMPAD6 ||
KEV.wVirtualKeyCode == VK_NUMPAD7 ||
KEV.wVirtualKeyCode == VK_NUMPAD8 ||
KEV.wVirtualKeyCode == VK_NUMPAD9)) {
continue;
}
if (KEV.uChar.UnicodeChar != 0) {
int prefix_len, char_len;
/* Character key pressed */
if (KEV.uChar.UnicodeChar >= 0xD800 &&
KEV.uChar.UnicodeChar < 0xDC00) {
/* UTF-16 high surrogate */
handle->tty.rd.last_utf16_high_surrogate = KEV.uChar.UnicodeChar;
continue;
}
/* Prefix with \u033 if alt was held, but alt was not used as part a
* compose sequence. */
if ((KEV.dwControlKeyState & (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED))
&& !(KEV.dwControlKeyState & (LEFT_CTRL_PRESSED |
RIGHT_CTRL_PRESSED)) && KEV.bKeyDown) {
handle->tty.rd.last_key[0] = '\033';
prefix_len = 1;
} else {
prefix_len = 0;
}
if (KEV.uChar.UnicodeChar >= 0xDC00 &&
KEV.uChar.UnicodeChar < 0xE000) {
/* UTF-16 surrogate pair */
WCHAR utf16_buffer[2] = { handle->tty.rd.last_utf16_high_surrogate,
KEV.uChar.UnicodeChar};
char_len = WideCharToMultiByte(CP_UTF8,
0,
utf16_buffer,
2,
&handle->tty.rd.last_key[prefix_len],
sizeof handle->tty.rd.last_key,
NULL,
NULL);
} else {
/* Single UTF-16 character */
char_len = WideCharToMultiByte(CP_UTF8,
0,
&KEV.uChar.UnicodeChar,
1,
&handle->tty.rd.last_key[prefix_len],
sizeof handle->tty.rd.last_key,
NULL,
NULL);
}
/* Whatever happened, the last character wasn't a high surrogate. */
handle->tty.rd.last_utf16_high_surrogate = 0;
/* If the utf16 character(s) couldn't be converted something must be
* wrong. */
if (!char_len) {
handle->flags &= ~UV_HANDLE_READING;
DECREASE_ACTIVE_COUNT(loop, handle);
handle->read_cb((uv_stream_t*) handle,
uv_translate_sys_error(GetLastError()),
&buf);
goto out;
}
handle->tty.rd.last_key_len = (unsigned char) (prefix_len + char_len);
handle->tty.rd.last_key_offset = 0;
continue;
} else {
/* Function key pressed */
const char* vt100;
size_t prefix_len, vt100_len;
vt100 = get_vt100_fn_key(KEV.wVirtualKeyCode,
!!(KEV.dwControlKeyState & SHIFT_PRESSED),
!!(KEV.dwControlKeyState & (
LEFT_CTRL_PRESSED |
RIGHT_CTRL_PRESSED)),
&vt100_len);
/* If we were unable to map to a vt100 sequence, just ignore. */
if (!vt100) {
continue;
}
/* Prefix with \x033 when the alt key was held. */
if (KEV.dwControlKeyState & (LEFT_ALT_PRESSED | RIGHT_ALT_PRESSED)) {
handle->tty.rd.last_key[0] = '\033';
prefix_len = 1;
} else {
prefix_len = 0;
}
/* Copy the vt100 sequence to the handle buffer. */
assert(prefix_len + vt100_len < sizeof handle->tty.rd.last_key);
memcpy(&handle->tty.rd.last_key[prefix_len], vt100, vt100_len);
handle->tty.rd.last_key_len = (unsigned char) (prefix_len + vt100_len);
handle->tty.rd.last_key_offset = 0;
continue;
}
} else {
/* Copy any bytes left from the last keypress to the user buffer. */
if (handle->tty.rd.last_key_offset < handle->tty.rd.last_key_len) {
/* Allocate a buffer if needed */
if (buf_used == 0) {
buf = uv_buf_init(NULL, 0);
handle->alloc_cb((uv_handle_t*) handle, 1024, &buf);
if (buf.base == NULL || buf.len == 0) {
handle->read_cb((uv_stream_t*) handle, UV_ENOBUFS, &buf);
goto out;
}
assert(buf.base != NULL);
}
buf.base[buf_used++] = handle->tty.rd.last_key[handle->tty.rd.last_key_offset++];
/* If the buffer is full, emit it */
if ((size_t) buf_used == buf.len) {
handle->read_cb((uv_stream_t*) handle, buf_used, &buf);
buf = uv_null_buf_;
buf_used = 0;
}
continue;
}
/* Apply dwRepeat from the last input record. */
if (--KEV.wRepeatCount > 0) {
handle->tty.rd.last_key_offset = 0;
continue;
}
handle->tty.rd.last_key_len = 0;
continue;
}
}
/* Send the buffer back to the user */
if (buf_used > 0) {
handle->read_cb((uv_stream_t*) handle, buf_used, &buf);
}
out:
/* Wait for more input events. */
if ((handle->flags & UV_HANDLE_READING) &&
!(handle->flags & UV_HANDLE_READ_PENDING)) {
uv_tty_queue_read(loop, handle);
}
DECREASE_PENDING_REQ_COUNT(handle);
#undef KEV
}
void uv_process_tty_read_line_req(uv_loop_t* loop, uv_tty_t* handle,
uv_req_t* req) {
uv_buf_t buf;
assert(handle->type == UV_TTY);
assert(handle->flags & UV_HANDLE_TTY_READABLE);
buf = handle->tty.rd.read_line_buffer;
handle->flags &= ~UV_HANDLE_READ_PENDING;
handle->tty.rd.read_line_buffer = uv_null_buf_;
if (!REQ_SUCCESS(req)) {
/* Read was not successful */
if (handle->flags & UV_HANDLE_READING) {
/* Real error */
handle->flags &= ~UV_HANDLE_READING;
DECREASE_ACTIVE_COUNT(loop, handle);
handle->read_cb((uv_stream_t*) handle,
uv_translate_sys_error(GET_REQ_ERROR(req)),
&buf);
} else {
/* The read was cancelled, or whatever we don't care */
handle->read_cb((uv_stream_t*) handle, 0, &buf);
}
} else {
if (!(handle->flags & UV_HANDLE_CANCELLATION_PENDING)) {
/* Read successful. TODO: read unicode, convert to utf-8 */
DWORD bytes = req->u.io.overlapped.InternalHigh;
handle->read_cb((uv_stream_t*) handle, bytes, &buf);
} else {
handle->flags &= ~UV_HANDLE_CANCELLATION_PENDING;
handle->read_cb((uv_stream_t*) handle, 0, &buf);
}
}
/* Wait for more input events. */
if ((handle->flags & UV_HANDLE_READING) &&
!(handle->flags & UV_HANDLE_READ_PENDING)) {
uv_tty_queue_read(loop, handle);
}
DECREASE_PENDING_REQ_COUNT(handle);
}
void uv_process_tty_read_req(uv_loop_t* loop, uv_tty_t* handle,
uv_req_t* req) {
assert(handle->type == UV_TTY);
assert(handle->flags & UV_HANDLE_TTY_READABLE);
/* If the read_line_buffer member is zero, it must have been an raw read.
* Otherwise it was a line-buffered read. FIXME: This is quite obscure. Use a
* flag or something. */
if (handle->tty.rd.read_line_buffer.len == 0) {
uv_process_tty_read_raw_req(loop, handle, req);
} else {
uv_process_tty_read_line_req(loop, handle, req);
}
}
int uv_tty_read_start(uv_tty_t* handle, uv_alloc_cb alloc_cb,
uv_read_cb read_cb) {
uv_loop_t* loop = handle->loop;
if (!(handle->flags & UV_HANDLE_TTY_READABLE)) {
return ERROR_INVALID_PARAMETER;
}
handle->flags |= UV_HANDLE_READING;
INCREASE_ACTIVE_COUNT(loop, handle);
handle->read_cb = read_cb;
handle->alloc_cb = alloc_cb;