piston/lxc/executors/brainfuck

#!/bin/bash

cd /tmp/$1
sedarg="\
s/+/P/g;\
s/-/M/g;\
s/>/++p;/g;\
s/</--p;/g;\
s/P/++*p;/g;\
s/M/--*p;/g;\
s/\\./putchar(*p);/g;\
s/,/*p=(c=getchar())==EOF?0:c;/g;\
s/\\[/while(*p){/g;\
s/]/}/g\
"

# compilation
MEMSIZE=15
cat <<EOF > code.c
#include <stdio.h>

char mem[1<<$MEMSIZE];
char *p = mem + (1<<$((MEMSIZE - 1)));
int c;

int main() {
	$(timeout -s KILL 3 sed 's/[^][<>.,+-]//g' code.code | timeout -s KILL 3 sed $sedarg)
}
EOF
timeout -s KILL 3 gcc -std=c11 -o binary code.c

# Merging args.args and stdin.stdin for emkc challenges
cat stdin.stdin >> args.args

# execution
timeout -s KILL 3 ./binary < args.args