From 32feb537da0228c4357632fd1f325556022cf911 Mon Sep 17 00:00:00 2001
From: DevSeed <devseed@163.com>
Date: Sun, 5 Jun 2016 22:07:46 +0800
Subject: [PATCH] yurisizuku

fix the pre processing bug that can't deal with multi line comments.
---
 srcCpp/pp.cpp | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100644 srcCpp/pp.cpp

diff --git a/srcCpp/pp.cpp b/srcCpp/pp.cpp
new file mode 100644
index 00000000..ba433cc1
--- /dev/null
+++ b/srcCpp/pp.cpp
@@ -0,0 +1,64 @@
+#include<iostream>
+#include<string>
+#include<fstream>
+using namespace std;
+/*
+	preprocess
+	remove \r\n,comments
+*/
+void preprocess(char *inpath,char *outpath)
+{
+	ifstream fin(inpath);
+	ofstream fout(outpath);
+	string line;
+	string tmp;
+	size_t start,end;
+	int flag=0;//flag=1 /* comment
+	while(getline(fin,line))
+	{
+		tmp="";
+		start=-2;
+		while(1)
+		{
+			start=line.find("\r\n",start+2);
+			if(start!=string::npos)
+				line=line.replace(start,2,"");
+			else break;
+		}
+		if(flag==1)
+		{
+			start=line.find("*/");
+			if(start!=string::npos)
+				flag=0;
+		}
+		else
+		{
+			start=line.find("//");
+			if(start!=string::npos)
+				line=line.substr(0,start);
+			start=-2;
+		}
+		while(1)
+		{
+			start+=2;
+			end=line.find("/*",start);
+			if(flag==0)
+				tmp+=line.substr(start,end-start);
+			if(end!=string::npos)
+				flag=1;
+			else break;
+			start=line.find("*/",end+2);
+			if(start!=string::npos)
+				flag=0;
+			else break;
+		}
+		fout<<tmp;
+	}
+	fin.close();
+	fout.close();
+}
+int main(int argc,char *argv[])
+{
+	preprocess(argv[1],argv[2]);
+	return 0;
+}