%%
%% The LaTeX Companion, 3ed
%%
%% Example 4-2-55 on page I-329 in "listings --- Pretty-printing program code".
%%
%% Copyright (C) 2022 Frank Mittelbach
%%
%% It may be distributed and/or modified under the conditions
%% of the LaTeX Project Public License, either version 1.3c
%% of this license or (at your option) any later version.
%%
%% See https://www.latex-project.org/lppl.txt for details.
%%

\documentclass{tlc3exa}
\pagestyle{empty}
\setcounter{page}{6}
\setlength\textwidth{135.0pt}

%StartShownPreambleCommands
\usepackage{color,listings}
\lstset{breaklines=true,breakindent=0pt,
        prebreak=\mbox{{\color{blue}\tiny$\searrow$}},
        postbreak=\mbox{{\color{blue}\tiny$\rightarrow$}}}
%StopShownPreambleCommands

\begin{document}
\begin{lstlisting}
Text at left margin
      /*A long string is broken across the line!*/
\end{lstlisting}
\begin{lstlisting}[breakautoindent=false,
                   postbreak=\tiny (cont.)\,]
Text at left margin
      /*A long string is broken across the line!*/
\end{lstlisting}
\end{document}