FBB::Tty(3bobcat) Controls echoing of characters FBB::Tty(3bobcat)

FBB::Tty - Controls echoing of characters entered at the terminal

#include <bobcat/tty>
Linking option: -lbobcat

Tty(3bobcat) objects can be used to control the echoing of characters entered at the terminal (usually at /dev/tty). Directly reading from /dev/tty allows programs to read information (e.g., passwords or pass phrases) even if the standard input stream is redirected to a file. Unless redirected, std::cin is connected to /dev/tty.

Tty(3bobcat) objects may be used as stand-alone objects or (usually anonymous) Tty(3bobcat) objects may be inserted into or extracted from streams. When inserting or extracting objects the involved streams are not affected; only the echoing of characters entered at /dev/tty is manipulated.

Tty(3bobcat)’s destructor does not reset the echo-state of /dev/tty to its original value. If that is required a Tty(3bobcat) object must be created first, calling its echo(Tty::RESET) member at the appropriate time.

All constructors, members, operators and manipulators, mentioned in this man-page, are defined in the namespace FBB.


The enum EchoType requests the type of echo-handling:

RESET is used to reset /dev/tty’s state to the actual state when a Tty(3bobcat) object was constructed
ON is used to activate echoing of characters entered at /dev/tty.
OFF is used to suppress echoing of characters entered at /dev/tty.

The current state of /dev/tty is saved.
Tty(EchoType type):
The current state of /dev/tty is saved, and the object’s member echo(type) is called.

Copy and move constructors (and assignment operators) are available.

std::istream &operator>>(std::istream &in, Tty const &tty):
The extraction operator does not affect in, but /dev/tty’s state is set according to the way the tty object was constructed.
std::ostream &operator<<(std::ostream &out, Tty const &tty):
The insertion operator does not affect out, but /dev/tty’s state is set according to the way the tty object was constructed.

echo(EchoType type):
/Dev/tty’s state is set according to the EchoType value that is passed to this member.

#include <iostream>
#include <string>
#include <bobcat/tty>
using namespace std;
using namespace FBB;
int main()
    cout << "Enter some text (not echoed): " << Tty(Tty::OFF);
    string line;
    getline(cin, line);
    cout << "\n"
            "You entered: `" << line << "’\n";
    cout << "Enter some text (echoed): ";
    getline(cin >> Tty(Tty::ON), line);
    cout << "You entered: `" << line << "’\n";

bobcat/tty - defines the class interface

bobcat(7), onekey(3bobcat)

None Reported.

https://fbb-git.gitlab.io/bobcat/: gitlab project page;
bobcat_6.02.02-x.dsc: detached signature;
bobcat_6.02.02-x.tar.gz: source archive;
bobcat_6.02.02-x_i386.changes: change log;
libbobcat1_6.02.02-x_*.deb: debian package containing the libraries;
libbobcat1-dev_6.02.02-x_*.deb: debian package containing the libraries, headers and manual pages;

Bobcat is an acronym of `Brokken’s Own Base Classes And Templates’.

This is free software, distributed under the terms of the GNU General Public License (GPL).

Frank B. Brokken (f.b.brokken@rug.nl).

2005-2022 libbobcat-dev_6.02.02