#include

#include

#include

#include

#include

void listFiles$($const char $*$dirPath$)$;

int main$($int argc, char const $*$argv$[])\{$

if $($argc $==1)\{$

$//$ No argument, print the current working directory WITHOUT recursion

char cwd$[1024]$;

if $($getcwd$($cwd$,$ sizeof$($cwd$))!=$ NULL$)\{$

listFiles$($cwd$)$;

$\}$ else $\{$

perror$("$getcwd$()$ this is error"$)$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

$\}$ else if $($argc $==2)\{$

$//$ Argument provided, print that directory RECURSIVELY

listFiles$($argv$[1])$;

$\}$ else $\{$

$//$ Too many arguments, display an error message

fprintf$($stderr$,$ "Usage: $\%$s $[$directory$]$

$",$ argv$[0])$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

return EXIT$\_$SUCCESS;

$\}$

void listFiles$($const char $*$dirPath$)\{$

DIR $*$dir;

struct dirent $*$entry;

if $(($dir $=$ opendir$($dirPath$))!=$ NULL$)\{$

while $(($entry $=$ readdir$($dir$))!=$ NULL$)\{$

if $($entry$->$d$\_$name$[0]!=\text{'}.\text{'})\{$

$//$ Ignore hidden files and directories

printf$("\%$s

$",$ entry$->$d$\_$name$)$;

$\}$

$\}$

closedir$($dir$)$;

$\}$ else $\{$

perror$("$there is no subdir it's an error"$)$;

exit$($EXIT$\_$FAILURE$)$;

$\}$

$\}$

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