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#!/bin/sh
#expans all the macro in source file

INCLUDE=""
#get all the header files directory
function get_include()
{
	for file_t in `ls -l $1|grep -E "^d|\.([ch]|cpp)$"|awk '{print $8}'`
	do
		if [ -d $1"/"$file_t ] #the file is a dir
		then
			if [ "$file_t" == "include" ]
			then
				INCLUDE=$INCLUDE" -I./"$1"/"$file_t
			else
				get_include $1"/"$file_t
			fi
		fi
	done

	export CFLAGS=$INCLUDE
}

function macro_expansion()
{
	oldpath=$1
	newpath=$2
	if [ ! -d $newpath ]
	then
		mkdir $newpath
	fi

	if [ $? -gt 0 ]
	then
		exit
	fi

	if [ $3 -eq 0 ]
	then
		get_include $oldpath
		echo $CFLAGS
	fi
	
	for file_t in `ls -l $1|grep -E "^d|\.([ch]|cpp)$"|awk '{print $8}'`
	do
        oldfile=$oldpath"/"$file_t
        newfile=$newpath"/"$file_t
		if [ -d $oldfile ] #the file is a dir
		then
			./expan_macro $oldfile $newfile 1
		else
			#echo $CFLAGS
			gcc -E $CFLAGS $oldfile -o $newfile 
		fi
	done
}

#Show help when script started without arguments
function showHelp()
{
	echo "Usage: $0 source_dir dst_dir flag(be 0 all the time)"
	echo "example:$0 src dst 0"
}

if [ ! $# -eq 3 ]
then
	showHelp
	exit
fi

macro_expansion $1 $2 $3

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