C到CPP的注释转换

connver_comment.h

#ifndef _CONNVER_COMMENT_H_
#define _CONNVER_COMMENT_H_

#define INPUTFILE "input.txt"
#define OUTPUTFILE "output.txt"

enum{
	CSTATUS,CPPSTATUS,NULLSTATUS,EOFSTATUS
};
void connver_main();
void do_null_status();
void do_c_status();
void do_cpp_status();
static void conver_work();

#endif

connver_comment.c

#include<stdio.h>
#include<stdlib.h>
#include"connver_comment.h"
int status=NULLSTATUS;

void do_null_status(FILE *ifp,FILE *ofp){
	int c = fgetc(ifp);
	if(c==EOF){
		status=EOFSTATUS;
		return;
	}
	else if(c=='/'){
			c = fgetc(ifp);
			if(c==EOF){
				fputc('/',ofp);
				status=EOFSTATUS;
				return;
			}
			else if(c=='*'){
				status=CSTATUS;
				fputc('/',ofp);
				fputc('/',ofp);
				return;
			}
			else if(c=='/'){
				status=CPPSTATUS;
				fputc('/',ofp);
				fputc('/',ofp);
				return;
			}
			else{
				fputc('/',ofp);
				fputc(c,ofp);
				return;
			}
		}
	fputc(c,ofp);
};

void do_c_status(FILE *ifp,FILE *ofp){
	int c = fgetc(ifp);
	if(c==EOF){
		status=EOFSTATUS;
		return;
	}
	else if(c=='*'){
		c = fgetc(ifp);
		if(c==EOF){
			status=EOFSTATUS;
			fputc('*',ofp);
			return;
		}
		else if(c=='/'){
			status=NULLSTATUS;
			fputc('
',ofp);
			return;
		}
		else{
		fputc('*',ofp);		
		ungetc(c,ifp); 
		}
	
		return;
	}
	else if(c=='
'){
		fputc('
',ofp);
		fputc('/',ofp);
		fputc('/',ofp);
		return;
	}
	else{
		fputc(c,ofp);		
	}
};
void do_cpp_status(FILE *ifp,FILE *ofp){
	
	int c=fgetc(ifp);
	if(c==EOF){
		status=EOFSTATUS;
		return;
	}
	else if(c=='
'){
		fputc('
',ofp);
		status=NULLSTATUS;
		return;
	}
	else{
		fputc(c,ofp);
	}
};

static void conver_work(FILE *ifp,FILE *ofp){

	while(status!=EOFSTATUS){
		
		switch(status){
		case NULLSTATUS:
			do_null_status(ifp,ofp);
			break;
		case CSTATUS:
			do_c_status(ifp,ofp);
			break;
		case CPPSTATUS:
			do_cpp_status(ifp,ofp);
			break;
		default:
			break;
		}
	}
}

void connver_main(){
	FILE *ifp = fopen(INPUTFILE,"r");
	FILE *ofp = fopen(OUTPUTFILE,"w");
	if(NULL==ifp||NULL==ofp){
		perror("open:");
	}
	conver_work(ifp,ofp);

	fclose(ifp);
	fclose(ofp);
}

test.c

#include"connver_comment.h"

int main(){
	connver_main();
	return 0;
}