\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{xippa}
\pdfinfo{
  /Title (c.pdf)
  /Creator (Cheatography)
  /Author (xippa)
  /Subject (C Cheat Sheet)
}

% Lengths and widths
\addtolength{\textwidth}{6cm}
\addtolength{\textheight}{-1cm}
\addtolength{\hoffset}{-3cm}
\addtolength{\voffset}{-2cm}
\setlength{\tabcolsep}{0.2cm} % Space between columns
\setlength{\headsep}{-12pt} % Reduce space between header and content
\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
\definecolor{HeadBackground}{HTML}{333333}
\definecolor{FootBackground}{HTML}{666666}
\definecolor{TextColor}{HTML}{333333}
\definecolor{DarkBackground}{HTML}{A3A3A3}
\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{C Cheat Sheet}}}} \\
    \normalsize{by \textcolor{DarkBackground}{xippa} via \textcolor{DarkBackground}{\uline{cheatography.com/184515/cs/38495/}}}
\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}xippa \\
  \uline{cheatography.com/xippa} \\
  \end{tabulary}
\vfill
\columnbreak
\begin{tabulary}{5.8cm}{L}
  \SetRowColor{FootBackground}
  \mymulticolumn{1}{p{5.377cm}}{\bf\textcolor{white}{Cheat Sheet}}  \\
   \vspace{-2pt}Not Yet Published.\\
   Updated 2nd May, 2023.\\
   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{multicols*}{2}

\begin{tabularx}{8.4cm}{X}
\SetRowColor{DarkBackground}
\mymulticolumn{1}{x{8.4cm}}{\bf\textcolor{white}{read line one by one}}  \tn
\SetRowColor{white}
\mymulticolumn{1}{x{8.4cm}}{\#include \textless{}stdio.h\textgreater{} \newline % Row Count 1 (+ 1)
FILE *h; \newline % Row Count 2 (+ 1)
char line{[}100{]}; \newline % Row Count 3 (+ 1)
h = fopen("filename", "rb"); \newline % Row Count 4 (+ 1)
if (h == NULL) \{ \newline % Row Count 5 (+ 1)
~~~~ exit(1); \newline % Row Count 6 (+ 1)
\}  \newline % Row Count 7 (+ 1)
while (fgets(line, sizeof line, h)) \{ \newline % Row Count 8 (+ 1)
~~~~/{\emph{ deal with line }}/ \newline % Row Count 9 (+ 1)
\} \newline % Row Count 10 (+ 1)
/{\emph{ if needed test why last read failed }}/ \newline % Row Count 11 (+ 1)
if (feof(h) || ferror(h)) /{\emph{ whatever }}/; \newline % Row Count 12 (+ 1)
fclose(h);% Row Count 13 (+ 1)
} \tn 
\hhline{>{\arrayrulecolor{DarkBackground}}-}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4.72 cm} x{3.28 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{makefile}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{RULES}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
all: \textless{}rule\textgreater{}... & executes all specified rules \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
clean: \{\{nl\}\}~~~~rm \textless{}file\textgreater{}... & removes specified files \tn 
% Row Count 6 (+ 3)
% Row 3
\SetRowColor{white}
.c to .o & \textless{}filename\textgreater{}.o: \textless{}filename\textgreater{}.c \tn 
% Row Count 8 (+ 2)
% Row 4
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{FLAGS}}} \tn 
% Row Count 9 (+ 1)
% Row 5
\SetRowColor{white}
\$@ & current target \tn 
% Row Count 10 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\$\textasciicircum{} & all sources for \$@ \tn 
% Row Count 12 (+ 2)
% Row 7
\SetRowColor{white}
\$\textless{} & leftmost source for \$@ \tn 
% Row Count 14 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{i/o}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{\{\{ac\}\}`\#include \textless{}stdio.h\textgreater{}`} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{{\bf{TAGS}}} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
"r" / "rb" & Read existing text/binary file. \tn 
% Row Count 4 (+ 2)
% Row 3
\SetRowColor{white}
"w" / "wb" & Write new/over existing text/binary file. \tn 
% Row Count 7 (+ 3)
% Row 4
\SetRowColor{LightBackground}
"a" / "ab" & Write new/append to existing text/binary file. \tn 
% Row Count 10 (+ 3)
% Row 5
\SetRowColor{white}
"r+" / "r+b" / "rb+" & Read and write existing text/binary file. \tn 
% Row Count 13 (+ 3)
% Row 6
\SetRowColor{LightBackground}
"w+" / "w+b" / "wb+" & Read and write new/over existing text/binary file. \tn 
% Row Count 16 (+ 3)
% Row 7
\SetRowColor{white}
"a+" / "a+b" / "ab+" & Read and write new/append to existing text/binary file. \tn 
% Row Count 19 (+ 3)
% Row 8
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{RANDOM-ACCESS}}} \tn 
% Row Count 20 (+ 1)
% Row 9
\SetRowColor{white}
fread(void *buf, sizeof(element), number, fptr) & Reads a number of elements from fptr to array *ptr. (safe) \tn 
% Row Count 23 (+ 3)
% Row 10
\SetRowColor{LightBackground}
fwrite(void *buf, sizeof(element), number, fptr) & Writes a number of elements to file fptr from array *ptr. \tn 
% Row Count 26 (+ 3)
% Row 11
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{{\bf{SEQUENCIAL}}} \tn 
% Row Count 27 (+ 1)
% Row 12
\SetRowColor{LightBackground}
fscanf(fptr, format, {[}...{]}) & Same as scanf with additional file pointer parameter. (unsafe) \tn 
% Row Count 31 (+ 4)
\end{tabularx}
\par\addvspace{1.3em}

\vfill
\columnbreak
\begin{tabularx}{8.4cm}{x{4 cm} x{4 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{i/o (cont)}}  \tn
% Row 13
\SetRowColor{LightBackground}
fprintf(fptr, format, {[}...{]}) & Same as printf with additional file pointer parameter. \tn 
% Row Count 3 (+ 3)
% Row 14
\SetRowColor{white}
fgets(strName, length, fptr);\{\{nl\}\} sscanf(strName, "\%d", \&x); & Uses fgets to limit the input length, then uses sscanf to read the resulting string in place of scanf. (safe) \tn 
% Row Count 9 (+ 6)
% Row 15
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{NAVIGATION}}} \tn 
% Row Count 10 (+ 1)
% Row 16
\SetRowColor{white}
fseek(fptr, offset, origin); & Sets current file position. Returns false is successful, true otherwise. The offset is a long integer type. \tn 
% Row Count 16 (+ 6)
% Row 17
\SetRowColor{LightBackground}
ftell(fptr) & Return current file position as a long integer. \tn 
% Row Count 19 (+ 3)
% Row 18
\SetRowColor{white}
SEEK\_SET & Beginning of file. \tn 
% Row Count 20 (+ 1)
% Row 19
\SetRowColor{LightBackground}
SEEK\_CUR & Current position in file. \tn 
% Row Count 22 (+ 2)
% Row 20
\SetRowColor{white}
SEEK\_END & End of file. \tn 
% Row Count 23 (+ 1)
% Row 21
\SetRowColor{LightBackground}
feof(fptr) & Tests end-of-file indicator. \tn 
% Row Count 25 (+ 2)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.68 cm} x{4.32 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{memory}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{\{\{ac\}\}`\#include \textless{}stdlib.h\textgreater{}`} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\seqsplit{malloc(sizeof(type)} * length ); & allocates memory, returns location. \tn 
% Row Count 3 (+ 2)
% Row 2
\SetRowColor{LightBackground}
realloc(ptrName, size); & reallocates memory, returns location. \tn 
% Row Count 5 (+ 2)
% Row 3
\SetRowColor{white}
free(ptrName); & decallocates memory. \tn 
% Row Count 6 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{1.44 cm} x{6.56 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{operators}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{BIT}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
a \textless{}\textless{} b; & shift a to the left for b bits \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
a \textgreater{}\textgreater{} b; & shift a to the right for b bits \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
a \& b; & bitwise and \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
a \textasciicircum{} b; & bitwise xor \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
a | b; & bitwise or \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
\textasciitilde{}a & bitwise complement \tn 
% Row Count 7 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.12 cm} x{4.88 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{structs}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{BITFIELD}}} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
struct\{char a:4, b:4\} x; & Declares  x  with two members  a  and  b  , both four bits in size (0 to 15.) \tn 
% Row Count 5 (+ 4)
% Row 2
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{ENUM}}} \tn 
% Row Count 6 (+ 1)
% Row 3
\SetRowColor{white}
enum bool \{ false, true \}; & A custom data type  bool  with two possible states:  false  or  true  . \tn 
% Row Count 9 (+ 3)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{p{0.8 cm} p{0.8 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{j}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{} \tn 
% Row Count 0 (+ 0)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{3.12 cm} x{4.88 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{character}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{\{\{ac\}\}`\#include \textless{}ctype.h\textgreater{}`} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
tolower(char) & lowercase modification \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
toupper(char) & lowercase modification \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
isalpha(char) & alphabet check \tn 
% Row Count 4 (+ 1)
% Row 4
\SetRowColor{LightBackground}
islower(char) & lowercase check \tn 
% Row Count 5 (+ 1)
% Row 5
\SetRowColor{white}
isupper(char) & uppercase check \tn 
% Row Count 6 (+ 1)
% Row 6
\SetRowColor{LightBackground}
isnumber(char) & number check \tn 
% Row Count 7 (+ 1)
% Row 7
\SetRowColor{white}
isblank(char) & whitespace check \tn 
% Row Count 8 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}

\begin{tabularx}{8.4cm}{x{2 cm} x{6 cm} }
\SetRowColor{DarkBackground}
\mymulticolumn{2}{x{8.4cm}}{\bf\textcolor{white}{string}}  \tn
% Row 0
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{\{\{ac\}\}`\#include \textless{}string.h\textgreater{}`} \tn 
% Row Count 1 (+ 1)
% Row 1
\SetRowColor{white}
\mymulticolumn{2}{x{8.4cm}}{{\bf{DEFAULT}}} \tn 
% Row Count 2 (+ 1)
% Row 2
\SetRowColor{LightBackground}
strlen(a) & return length \tn 
% Row Count 3 (+ 1)
% Row 3
\SetRowColor{white}
strcpy(a, b) & copy a to b \tn 
% Row Count 5 (+ 2)
% Row 4
\SetRowColor{LightBackground}
strcat(a, b) & concatenate a to b \tn 
% Row Count 7 (+ 2)
% Row 5
\SetRowColor{white}
strcmp(a, b) & compares a to b (FALSE IF SAME) \tn 
% Row Count 9 (+ 2)
% Row 6
\SetRowColor{LightBackground}
strstr(a, b) & finds first str b in a, returns ptr. \tn 
% Row Count 11 (+ 2)
% Row 7
\SetRowColor{white}
strchr(a, b) & finds first char b in a, returns ptr. \tn 
% Row Count 13 (+ 2)
% Row 8
\SetRowColor{LightBackground}
strrchr(a,b) & finds last char b in a, return ptr. \tn 
% Row Count 15 (+ 2)
% Row 9
\SetRowColor{white}
strpbrk(a,b) & finds first char in a that's also in b, return ptr. \tn 
% Row Count 17 (+ 2)
% Row 10
\SetRowColor{LightBackground}
strspn(a, b) & returns range from a to char from b \tn 
% Row Count 19 (+ 2)
% Row 11
\SetRowColor{white}
strcspn(a, b) & returns range from a to char NOT from b \tn 
% Row Count 21 (+ 2)
% Row 12
\SetRowColor{LightBackground}
\mymulticolumn{2}{x{8.4cm}}{{\bf{MEMORY}}} \tn 
% Row Count 22 (+ 1)
\hhline{>{\arrayrulecolor{DarkBackground}}--}
\end{tabularx}
\par\addvspace{1.3em}


% That's all folks
\end{multicols*}

\end{document}