\nonstopmode
\documentclass[12pt]{report} 
\usepackage{hyperref}
\hypersetup{colorlinks=true,linkcolor=blue}
\usepackage{theorem,graphicx}
\usepackage{listings,alltt}
\bibliographystyle{plain}


\lstset{ %configuring the display of Dwsim codes
             tabsize=4,
             language=dwsim,
             basicstyle=\ttfamily,
             aboveskip={1\baselineskip},
             showstringspaces=false,
             breaklines=true,
             showspaces=false,
             numbers=left,
             numberstyle=\small,
             stringstyle=\normalfont,
             keywordstyle=\color{red},
             emph={clc, all, gca},
             emphstyle=\color{red},
             commentstyle=\color{blue}\normalfont}

 
% code environment
{\theorembodyfont{\rmfamily} \newtheorem{codemass}{Dwsim code}[chapter]}
\newenvironment{code}%
{\begin{codemass}}{\hrule \end{codemass}}

{\theorembodyfont{\rmfamily} \newtheorem{accmass}{Acc}[chapter]}
\newenvironment{acc-code}%
{\begin{accmass}}{\end{accmass}}


% create listing for code

\newcommand\tcaption[1]
     {\addcontentsline{cod}{section}{\protect\numberline {\thecodemass}#1}}
\makeatletter \newcommand\listofcode
     {\chapter*{List of Dwsim Codes\markboth%
                        {\bf List of Dwsim Codes}{}}%
\renewcommand*\l@section{\@dottedtocline{1}{1.5em}{5em}}%
\addcontentsline{toc}{chapter}{\protect\numberline{List of Dwsim Codes}}
\@starttoc{cod}}
\newcommand\l@matlab[3]
     {#1 \par\noindent#2, #3 \par}
\renewcommand\@pnumwidth{2.1em}
%\makeatother

\makeatletter
\def\curlable#1{\def\thecodemass{#1}\def\@currentlabel{#1}}
\makeatother

\newcommand{\coderef}[1]{Exa~\ref{#1}}
\newcommand{\figref}[1]{Fig.~\ref{#1}}