Escapeism

[Kay Schluehr]

Usually I struggle a short while with \ and either succeed or give up.
Today I'm in a different mood and don't give up. So here is my
question:

You have an unknown character string c such as '\n' , '\a' , '\7' etc.

How do you echo them using print?

print_str( c ) prints representation '\a' to stdout for c = '\a'
print_str( c ) prints representation '\n' for c = '\n'
...

It is required that not a beep or a linebreak shall be printed.

First of all it has be remarked that it is impossible to a certain
extent. That's because e.g. c = '\a' and c = '\7' do represent the same
string but this ambiguity doesn't occur for many numbers. But lets
weaken the requirement and fix a canonical representation in case of
ambiguity. I'm still getting stuck here.