111 lines
3.1 KiB
Go
111 lines
3.1 KiB
Go
// Fenrir console screen reader.
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// Copyright (c) 2026 Storm Dragon
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// SPDX-License-Identifier: GPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify it
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// under the terms of the GNU General Public License as published by the Free
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// Software Foundation, either version 3 of the License, or (at your option)
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// any later version.
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//
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// This program is distributed in the hope that it will be useful, but WITHOUT
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// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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// FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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// more details.
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//
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// You should have received a copy of the GNU General Public License along with
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// this program. If not, see <https://www.gnu.org/licenses/gpl-3.0.html>.
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//go:build linux && cgo
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package console
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/*
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#include <linux/kd.h>
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#include <linux/keyboard.h>
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#include <linux/input.h>
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#include <sys/ioctl.h>
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#include <errno.h>
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static int ui_key_text(int fd, unsigned int code, int shift, int altgr) {
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if (code >= NR_KEYS) return 0;
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unsigned char leds = 0;
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if (ioctl(fd, KDGKBLED, &leds) < 0) return -errno;
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struct kbentry entry = {.kb_table = (shift ? 1 << KG_SHIFT : 0) |
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(altgr ? 1 << KG_ALTGR : 0), .kb_index = code};
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if (ioctl(fd, KDGKBENT, &entry) < 0) return -errno;
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if (KTYP(entry.kb_value) == KT_LETTER && (leds & LED_CAP)) {
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entry.kb_table ^= 1 << KG_SHIFT;
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if (ioctl(fd, KDGKBENT, &entry) < 0) return -errno;
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}
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unsigned int value = entry.kb_value;
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if (KTYP(value) == KT_LATIN || KTYP(value) == KT_LETTER) return KVAL(value);
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// The console encodes Unicode keysyms by inverting their high nibble.
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if (KTYP(value) >= 0x10) return value ^ 0xf000;
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return 0; // Compose/dead-key sequences are not text by themselves.
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}
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*/
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import "C"
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import (
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"os"
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"syscall"
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"unicode"
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"git.stormux.org/storm/fenrir/internal/input"
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)
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func (k *Keyboards) Capture(enabled bool) (result error) {
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if enabled {
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file, err := os.OpenFile("/dev/tty0", os.O_RDONLY|syscall.O_NOCTTY, 0)
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if err != nil {
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return err
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}
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defer func() {
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if result != nil {
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file.Close()
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}
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}()
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// Neutralize terminal-visible modifiers before taking modal ownership.
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for _, device := range k.devices {
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for _, code := range k.router.Forwarded(device.fd) {
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if err := device.forward(1, code, 0); err != nil {
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return err
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}
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}
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if err := device.forward(0, 0, 0); err != nil {
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return err
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}
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}
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if k.uiMap != nil {
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k.uiMap.Close()
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}
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k.uiMap = file
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} else if k.uiMap != nil {
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k.uiMap.Close()
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k.uiMap = nil
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}
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k.router.Capture(enabled)
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return nil
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}
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func (k *Keyboards) ui_text(code uint16, decision input.Decision) error {
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if decision.UI == nil || decision.UI.Name != "" || k.uiMap == nil {
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return nil
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}
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shift, altGr := C.int(0), C.int(0)
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if decision.UI.Shift {
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shift = 1
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}
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if decision.UI.AltGr {
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altGr = 1
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}
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value := int(C.ui_key_text(C.int(k.uiMap.Fd()), C.uint(code), shift, altGr))
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if value < 0 {
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return syscall.Errno(-value)
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}
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if value > 0 && unicode.IsPrint(rune(value)) {
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decision.UI.Text = string(rune(value))
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}
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return nil
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}
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