79 lines
2.3 KiB
Go
79 lines
2.3 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 <sys/ioctl.h>
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#include <errno.h>
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#include <termios.h>
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static int paste_byte(int fd, unsigned char value) {
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return ioctl(fd, TIOCSTI, &value) < 0 ? -errno : 0;
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}
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*/
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import "C"
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import (
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"context"
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"fmt"
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"os"
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"path/filepath"
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"syscall"
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)
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// Paste runs on the clipboard worker and targets a captured VT. Recheck text
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// mode and the active VT before each byte; never follow a VT switch mid-paste.
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// Kernels that deny TIOCSTI return their error without reporting success.
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func (s *Source) Paste(ctx context.Context, text string, terminal int) error {
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if err := ctx.Err(); err != nil {
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return err
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}
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// Check before opening the target: otherwise our own descriptor would
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// make an unused console pass the occupancy check below.
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number, textMode, _, _, err := s.active()
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if err != nil {
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return err
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}
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if number != terminal || !textMode {
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return fmt.Errorf("clipboard paste stopped: active VT changed")
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}
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path := filepath.Join(s.root, "dev", fmt.Sprintf("tty%d", terminal))
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file, err := os.OpenFile(path, os.O_WRONLY|syscall.O_NOCTTY|syscall.O_NONBLOCK, 0)
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if err != nil {
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return err
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}
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defer file.Close()
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for _, value := range []byte(text) {
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if err := ctx.Err(); err != nil {
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return err
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}
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number, textMode, _, _, err := s.active()
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if err != nil {
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return err
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}
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if number != terminal || !textMode {
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return fmt.Errorf("clipboard paste stopped: active VT changed")
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}
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if code := C.paste_byte(C.int(file.Fd()), C.uchar(value)); code < 0 {
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return fmt.Errorf("console clipboard paste: %w", syscall.Errno(-code))
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}
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}
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return nil
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}
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