fix my code #include

#include

#include

#include

#include

#include

#define MAX$\_$LINE $80//$ Maximum length of command

#define HISTORY$\_$SIZE $10//$ Size of history

$//$ Function prototypes

void parse$\_$command$($char $*$input$,$ char $**$args$,$ int $*$background$,$ int $*$input$\_$redir, int $*$output$\_$redir, int $*$pipe$\_$flag, char $**$input$\_$file, char $**$output$\_$file, char $**$pipe$\_$args$)$;

void execute$\_$command$($char $**$args$,$ int background, int input$\_$redir, int output$\_$redir, char $*$input$\_$file, char $*$output$\_$file, int pipe$\_$flag, char $**$pipe$\_$args$)$;

void handle$\_$history$($char $*$input$,$ char $**$history$,$ int $*$history$\_$index$)$;

void print$\_$history$($char $**$history$,$ int history$\_$index$)$;

void handle$\_$pipe$($char $**$args$1,$ char $**$args$2)$;

int main$($void$)\{$

char $*$args$[$MAX$\_$LINE $/2+1]$; $//$ Command line arguments

char $*$pipe$\_$args$[$MAX$\_$LINE $/2+1]$; $//$ Arguments for the second command in a pipe

char $*$history$[$HISTORY$\_$SIZE$]$; $//$ Command history

int history$\_$index $=0$; $//$ Current index in history

int should$\_$run $=1$; $//$ Flag to determine when to exit shell

char input$[$MAX$\_$LINE$]$; $//$ User input

int background, input$\_$redir, output$\_$redir, pipe$\_$flag; $//$ Flags for $\text{'}$&$\text{'},$ input$/$output redirection, and pipe

char $*$input$\_$file $=$ NULL, $*$output$\_$file $=$ NULL; $//$ File names for redirection

$//$ Initialize history

for $($int i $=0$; i $<$ HISTORY$\_$SIZE; i$++)\{$

history$[$i$]=$ NULL;

$\}$

while $($should$\_$run$)\{$

printf$("$osh$>")$;

fflush$($stdout$)$;

$//$ Read the user input

if $(!$fgets$($input$,$ MAX$\_$LINE, stdin$))\{$

perror$("$fgets$")$;

exit$(1)$;

$\}$

input$[$strlen$($input$)-1]=\text{'}\backslash 0\text{'}$; $//$ Remove newline character

$//$ Handle "exit" command

if $($strcmp$($input$,$ "exit"$)==0)\{$

should$\_$run $=0$;

continue;

$\}$

$//$ Handle history and built$-$in commands

if $($strcmp$($input$,$ "history"$)==0)\{$

print$\_$history$($history$,$ history$\_$index$)$;

continue;

$\}$

$//$ Handle $\text{'}!!\text{'}$ for repeating the last command

handle$\_$history$($input$,$ history, &history$\_$index$)$;

$//$ Parse the command into args$[]$

parse$\_$command$($input$,$ args, &background, &input$\_$redir, &output$\_$redir, &pipe$\_$flag, &input$\_$file, &output$\_$file, pipe$\_$args$)$;

$//$ Execute the command

execute$\_$command$($args$,$ background, input$\_$redir, output$\_$redir, input$\_$file, output$\_$file, pipe$\_$flag, pipe$\_$args$)$;

$\}$

$//$ Free the history buffer

for $($int i $=0$; i $<$ HISTORY$\_$SIZE; i$++)\{$

if $($history$[$i$])$ free$($history$[$i$])$;

$\}$

return $0$;

$\}$

$//$ Function to parse the input into command and its arguments

void parse$\_$command$($char $*$input$,$ char $**$args$,$ int $*$background$,$ int $*$input$\_$redir, int $*$output$\_$redir, int $*$pipe$\_$flag, char $**$input$\_$file, char $**$output$\_$file, char $***$pipe$\_$args$)\{$

$*$background $=0$;

$*$input$\_$redir $=0$;

$*$output$\_$redir $=0$;

$*$pipe$\_$flag $=0$;

char $*$token $=$ strtok$($input$,"")$;

int i $=0$;

while $($token $!=$ NULL$)\{$

if $($strcmp$($token$,"$&$")==0)\{$

$*$background $=1$;

$\}$ else if $($strcmp$($token$,"<")==0)\{$

$*$input$\_$redir $=1$;

token $=$ strtok$($NULL$,"")$;

$*$input$\_$file $=$ token;

$\}$ else if $($strcmp$($token$,">")==0)\{$

$*$output$\_$redir $=1$;

token $=$ strtok$($NULL$,"")$;

$*$output$\_$file $=$ token;

$\}$ else if $($strcmp$($token$,"|")==0)\{$

$*$pipe$\_$flag $=1$;

args$[$i$]=$ NULL; $//$ Null terminate the first command's args

i $=0$;

token $=$ strtok$($NULL$,"")$;

while $($token $!=$ NULL$)\{$

$(*$pipe$\_$args$)[$i$++]=$ token;

token $=$ strtok$($NULL$,"")$;

$\}$

$(*$pipe$\_$args$)[$i$]=$ NULL; $//$ Null terminate the second command's args

break;

$\}$ else $\{$

args$[$i$++]=$ token;

$\}$

token $=$ strtok$($NULL$,"")$;

$\}$

args$[$i$]=$ NULL; $//$ Null terminate the args array

$\}$

$//$ Function to handle pipes

void handle$\_$pipe$($char $**$args$1,$ char $**$args$2)\{$

int fd$[2]$;

if $($pipe$($fd$)==-1)\{$

perror$("$pipe$")$;

exit$(1)$;

$\}$

pid$\_$t pid$1=$ fork$()$;

if $($pid$1<0)\{$

perror$("$fork$")$;

exit$(1)$;

$\}$

if $($pid$1==0)\{$

$//$ First child: send output to pipe

close$($fd$[0])$; $//$ Close unused read end

dup$2($fd$[1],$ STDOUT$\_$FILENO$)$; $//$ Redirect stdout to pipe

close$($fd$[1])$; $//$ Close write end after redirecting

execvp$($args$1[0],$ args$1)$;

perror$("$execvp$")$; $//$ Error handling

exit$(1)$;

$\}$

pid$\_$t pid$2=$ fork$()$;

if $($pid$2<0)\{$

perror$("$fork$")$;

exit$(1)$;

$\}$

if $($pid$2==0)\{$

$//$ Second child: receive input from pipe

close$($fd$[1])$; $//$ Close unused write end

dup$2($fd$[0],$ STDIN$\_$FILENO$)$; $//$ Redirect stdin