\documentclass[10pt,a4paper]{article}

% Packages
\usepackage{fancyhdr}           % For header and footer
\usepackage{multicol}           % Allows multicols in tables
\usepackage{tabularx}           % Intelligent column widths
\usepackage{tabulary}           % Used in header and footer
\usepackage{hhline}             % Border under tables
\usepackage{graphicx}           % For images
\usepackage{xcolor}             % For hex colours
%\usepackage[utf8x]{inputenc}    % For unicode character support
\usepackage[T1]{fontenc}        % Without this we get weird character replacements
\usepackage{colortbl}           % For coloured tables
\usepackage{setspace}           % For line height
\usepackage{lastpage}           % Needed for total page number
\usepackage{seqsplit}           % Splits long words.
%\usepackage{opensans}          % Can't make this work so far. Shame. Would be lovely.
\usepackage[normalem]{ulem}     % For underlining links
% Most of the following are not required for the majority
% of cheat sheets but are needed for some symbol support.
\usepackage{amsmath}            % Symbols
\usepackage{MnSymbol}           % Symbols
\usepackage{wasysym}            % Symbols
%\usepackage[english,german,french,spanish,italian]{babel}              % Languages

% Document Info
\author{TimSch}
\pdfinfo{
  /Title (dynamische-speicherverwaltung.pdf)
  /Creator (Cheatography)
  /Author (TimSch)
  /Subject (Dynamische Speicherverwaltung Cheat Sheet)
}

% Lengths and widths
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\setlength{\headheight}{85pt} % If less, LaTeX automatically increases it
\renewcommand{\footrulewidth}{0pt} % Remove footer line
\renewcommand{\headrulewidth}{0pt} % Remove header line
\renewcommand{\seqinsert}{\ifmmode\allowbreak\else\-\fi} % Hyphens in seqsplit
% This two commands together give roughly
% the right line height in the tables
\renewcommand{\arraystretch}{1.3}
\onehalfspacing

% Commands
\newcommand{\SetRowColor}[1]{\noalign{\gdef\RowColorName{#1}}\rowcolor{\RowColorName}} % Shortcut for row colour
\newcommand{\mymulticolumn}[3]{\multicolumn{#1}{>{\columncolor{\RowColorName}}#2}{#3}} % For coloured multi-cols
\newcolumntype{x}[1]{>{\raggedright}p{#1}} % New column types for ragged-right paragraph columns
\newcommand{\tn}{\tabularnewline} % Required as custom column type in use

% Font and Colours
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\definecolor{FootBackground}{HTML}{666666}
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\definecolor{LightBackground}{HTML}{F3F3F3}
\renewcommand{\familydefault}{\sfdefault}
\color{TextColor}

% Header and Footer
\pagestyle{fancy}
\fancyhead{} % Set header to blank
\fancyfoot{} % Set footer to blank
\fancyhead[L]{
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{C}
    \SetRowColor{DarkBackground}
    \vspace{-7pt}
    {\parbox{\dimexpr\textwidth-2\fboxsep\relax}{\noindent
        \hspace*{-6pt}\includegraphics[width=5.8cm]{/web/www.cheatography.com/public/images/cheatography_logo.pdf}}
    }
\end{tabulary}
\columnbreak
\begin{tabulary}{11cm}{L}
    \vspace{-2pt}\large{\bf{\textcolor{DarkBackground}{\textrm{Dynamische Speicherverwaltung Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{TimSch} via \textcolor{DarkBackground}{\uline{cheatography.com/29480/cs/15155/}}}
\end{tabulary}
\end{multicols}}

\fancyfoot[L]{ \footnotesize
\noindent
\begin{multicols}{3}
\begin{tabulary}{5.8cm}{LL}
  \SetRowColor{FootBackground}
  \mymulticolumn{2}{p{5.377cm}}{\bf\textcolor{white}{Cheatographer}}  \\
  \vspace{-2pt}TimSch \\
  \uline{cheatography.com/timsch} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Published 18th March, 2018.\\
   Updated 18th March, 2018.\\
   Page {\thepage} of \pageref{LastPage}.
\end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Sponsor}}  \\
  \SetRowColor{white}
  \vspace{-5pt}
  %\includegraphics[width=48px,height=48px]{dave.jpeg}
  Measure your website readability!\\
  www.readability-score.com
\end{tabulary}
\end{multicols}}




\begin{document}
\raggedright
\raggedcolumns

% Set font size to small. Switch to any value
% from this page to resize cheat sheet text:
% www.emerson.emory.edu/services/latex/latex_169.html
\footnotesize % Small font.


\begin{tabularx}{17.67cm}{x{8.635 cm} x{8.635 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Speicher reservieren}}  \tn
% Row 0
\SetRowColor{LightBackground}
Reservieren ohne clearen (Null setzen) & void *malloc(int Groesse); \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
Beispiel & double *t = malloc(2 * sizeof(double)); \{\{nl\}\} double *v = malloc(2 * sizeof(*v)); \tn 
% Row Count 7 (+ 5)
% Row 2
\SetRowColor{LightBackground}
Reservieren mit clearen (reservierte Bereiche mit 0 initialisieren) & void *calloc(int Anzahl\_Elemente, int \seqsplit{Groesse\_eines\_Elements);} \tn 
% Row Count 11 (+ 4)
% Row 3
\SetRowColor{white}
Beispiel & double *u = calloc(2, sizeof(double)); \{\{nl\}\}double *w = calloc(2, sizeof(*w); \tn 
% Row Count 16 (+ 5)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{5.8718 cm} x{11.3982 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Reservierten Speicher vergr{\"o}{\ss}ern / verkleinern}}  \tn
% Row 0
\SetRowColor{LightBackground}
Speicher reallozieren & `void {\emph{realloc(void }}AlterSpeicherbereich, int NeueGroesse);` \tn 
% Row Count 3 (+ 3)
% Row 1
\SetRowColor{white}
Beispiel & `int {\emph{pArray = malloc(5 }} sizeof(int)); \{\{nl\}\}pArray = realloc(pArray, 1000 * sizeof(int))` \tn 
% Row Count 7 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{Ist der neue Speicherbereich gr{\"o}{\ss}er, werden die bisherigen Daten in den neuen Speicherbereich kopiert. \{\{nl\}\}  \newline Ist der neue Speicherbereich kleiner, werden die Daten nur bis zur Gr{\"o}{\ss}e des neuen Bereichs kopiert. \{\{nl\}\}Wird als neue Gr{\"o}{\ss}e eine 0 angegeben, funktioniert  die Funktion wie free(); \{\{nl\}\}Wird als alter Speicherbereich der NULL-Zeiger angegeben, funktioniert die Funktion wie malloc();}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{17.67cm}{x{2.9359 cm} x{14.3341 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{17.67cm}}{\bf\textcolor{white}{Reservierten Speicher freigeben}}  \tn
% Row 0
\SetRowColor{LightBackground}
\seqsplit{Funktion} & `free(SPEICHER);` \tn 
% Row Count 2 (+ 2)
% Row 1
\SetRowColor{white}
\seqsplit{Beispiel} & `void *z = malloc(1000); //1000Bytes Speicher reservieren \{\{nl\}\} if(z != NULL) \{\{nl\}\} \{ \{\{nl\}\} ~ free(z); \{\{nl\}\} \}` \tn 
% Row Count 6 (+ 4)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{17.67cm}}{Die free Funktion darf nur Speicherbereiche freigeben, die zuvor mit malloc oder calloc reserviert wurden. \{\{nl\}\}free(NULL); bewirkt nichts und verursacht keinen Fehler;}  \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}



\end{document}