移出c程序注释

#include <stdio.h>
#include <string.h>

char *comment;
void act_null(char *src)
{
	
}

void act_mark(char *src)
{
	comment = src;
	
}
void act_remove(char *src)
{
	int len = src - comment;
	memset(comment,' ',len+2);
}
void act_remove2(char *src)
{
	int len = src - comment;
	memset(comment,' ',len);
}
int state_trans_table[6][6] = 
{
	{0,3,0,0,0,0},
	{0,3,2,3,4,5},
	{2,2,3,2,2,2},
	{0,3,2,3,4,5},
	{4,4,4,4,4,3},
	{0,1,2,3,4,5}
};

void (*act_table[6][6])(char *src) = 
{
	{act_null,act_remove,act_null,act_null,act_null,act_null},
	{act_mark,act_null,act_null,act_null,act_mark,act_null},
	{act_null,act_null,act_null,act_null,act_null,act_null},
	{act_mark,act_null,act_null,act_null,act_mark,act_null},
	{act_null,act_null,act_null,act_null,act_null,act_remove2},
	{act_null,act_null,act_null,act_null,act_mark,act_null}

};

int get_input_type(char *src)
{
	if(strncmp(src,"/*",2) == 0)
		return 0;
	else if(strncmp(src,"*/",2) == 0)
		return 1;
	else if(strncmp(src,"\"",1) == 0)
		return 2;
	else if(strncmp(src,"//",2) == 0)
		return 4;
	else if(strncmp(src,"\n",1) == 0)
		return 5;
	else
		return 3;

}

char *remove_comment(char *src)
{
	int state = 3;
	int input = 3;
	char *dest = src;

	while(*src != '\0')
	{
		input = get_input_type(src);
		act_table[state][input](src);
		state = state_trans_table[state][input];
		src++;
	}
	return dest;

}

int main(int argc ,char *argv[])
{
	FILE *fpsrc;
	FILE *fpdest;
	char *namepath;
	char *dest;
	char buf[10240] = {0};
	int len;	
	if(argc != 2)
	{
		printf("Usage: ./a.out pathname\n");
		return ;
	}

	namepath = argv[1];
	
	if((fpsrc = fopen(argv[1],"r+")) == NULL)
	{
		printf("open srcfile error!\n");
		return ;
	}
	strcat(namepath,".out.c");
	if((fpdest = fopen(namepath,"w")) == NULL)
	{
		printf("open dest error!\n");
		return ;
	}
	
	len = fread(buf,1,sizeof(buf),fpsrc);
	buf[len] = '\0';
	printf("src(len = %d):\n%s",len,buf);
	fclose(fpsrc);
	dest = remove_comment(buf);
	
	fwrite(dest,1,len,fpdest);
	
	printf("dest:\n%s",dest);

	return 0;

}