$/*$ XXX DO NOT MODIFY THIS FILE XXX $*/$

#define $\_$POSIX$\_$C$\_$SOURCE $200809$

#include

#include

#include

#include

#include

#include

#include

#include

#include "exit.h$"$

#include "params.h$"$

#include "parser.h$"$

#include "runner.h$"$

#include "signal.h$"$

#include "util$/$gprintf$.$h$"$

#include "wait.h$"$

$/**$ Main bigshell loop

$*/$

int

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

$\{$

struct command$\_$list $*$cl $=0$;

$/*$ Program initialization routines $*/$

if $($parser$\_$init$()<0)$ goto err;

$/*$ TODO Enable this line once you've implemented the function $*/$

$//$if $($signal$\_$init$()<0)$ goto err;

$/*$ Main Event Loop: REPL $--$ Read Evaluate Print Loop $*/$

for $($;;$)\{$

prompt:

$/*$ Check on backround jobs $*/$

if $($wait$\_$on$\_$bg$\_$jobs$()<0)$ goto err;

$/*$ Read input and parse it into a list of commands $*/$

$/*$ TODO Enable this line once you've implemented the function $*/$

$//$if $($signal$\_$enable$\_$interrupt$($SIGINT$)<0)$ goto err;

int res $=$ command$\_$list$\_$parse$($&cl$,$ stdin$)$;

$/*$ TODO Enable this line once you've implemented the function $*/$

$//$ if $($signal$\_$ignore$($SIGINT$)<0)$ goto err;

if $($res $==-1)\{/*$ System library errors $*/$

switch $($errno$)\{/*$ Handle specific errors $*/$

case EINTR:

clearerr$($stdin$)$;

errno $=0$;

fputc$(\text{'}$

$\text{'},$ stderr$)$;

goto prompt;

default:

goto err; $/*$ Unrecoverable errors $*/$

$\}$

$\}$ else if $($res $<0)\{/*$ Parser syntax errors $*/$

fprintf$($stderr$,$ "Syntax error: $\%$s

$",$ command$\_$list$\_$strerror$($res$))$;

errno $=0$;

goto prompt;

$\}$ else if $($res $==0)\{/*$ No commands parsed $*/$

if $($feof$($stdin$))$ bigshell$\_$exit$()$; $/*$ Exit on eof $*/$

goto prompt; $/*$ Blank line $*/$

$\}$ else $\{$

gprintf$("$Parsed command list to execute:"$)$;

#ifndef NDEBUG

command$\_$list$\_$print$($cl$,$ stderr$)$;

fputc$(\text{'}$

$\text{'},$ stderr$)$;

#endif

gprintf$("$executing command list with $\%$zu commands", cl$->$command$\_$count$)$;

$/*$ Execute commands $*/$

run$\_$command$\_$list$($cl$)$;

$/*$ Cleanup $*/$

command$\_$list$\_$free$($cl$)$;

free$($cl$)$;

cl $=0$;

$\}$

$\}$

err:

if $($cl$)$ command$\_$list$\_$free$($cl$)$;

free$($cl$)$;

params.status $=127$;

warn$(0)$;

bigshell$\_$exit$()$;

$\}$