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term.ReadPassword reads the terminal with a raw read that returns 0 bytes at the end of input and takes that as nothing yet, so Ctrl-D at the prompt did nothing. On the Unix systems the prompt now sets the terminal as ReadPassword does and reads the line from standard input, which reports the end of input; elsewhere, such as Windows, it still uses ReadPassword. Ctrl-D with nothing typed gives an empty mnemonic, refused with status 1, and the terminal settings are put back. A test runs the tool on a pseudo-terminal (github.com/creack/pty, at a commit past v1.1.24, whose Open on Linux can return another pty's terminal) and types Ctrl-D at the prompt. Model: opus-5-5
49 lines
1.3 KiB
Go
49 lines
1.3 KiB
Go
//go:build aix || darwin || dragonfly || freebsd || linux || netbsd || openbsd || solaris || zos
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package mnemonic
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import (
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"bufio"
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"errors"
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"fmt"
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"io"
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"os"
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"golang.org/x/sys/unix"
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)
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// readWithoutEcho reads one line from the terminal on standard input
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// with echo turned off. The line ends at a newline or at the end of
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// input (Ctrl-D). The terminal is set as term.ReadPassword sets it;
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// ReadPassword itself is not used here because it never sees the end
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// of input and goes on waiting.
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func readWithoutEcho() (string, error) {
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fd := int(os.Stdin.Fd())
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settings, err := unix.IoctlGetTermios(fd, ioctlReadTermios)
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if err != nil {
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return "", fmt.Errorf("reading the terminal settings: %w", err)
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}
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hidden := *settings
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hidden.Lflag &^= unix.ECHO
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hidden.Lflag |= unix.ICANON | unix.ISIG
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hidden.Iflag |= unix.ICRNL
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err = unix.IoctlSetTermios(fd, ioctlWriteTermios, &hidden)
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if err != nil {
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return "", fmt.Errorf("turning echo off: %w", err)
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}
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defer func() { _ = unix.IoctlSetTermios(fd, ioctlWriteTermios, settings) }()
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// With ICANON set, a read from the terminal returns at most one
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// line, so the buffer takes nothing past the newline.
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typed, err := bufio.NewReader(os.Stdin).ReadString('\n')
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if errors.Is(err, io.EOF) {
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return typed, nil
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}
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return typed, err
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}
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