用netbeans调试以下代码，希望实现find的简单功能
但为何发现file_name=direntp->d_name;
file_name指向的字符串会出现“344270213”等的数据？这是什么码？
strstr(file_name,search_name)!=NULL为何恒为真呢？

#include
#include
#include
#include
#include

#define Max_Length 1000
void du_( int , char *[]);
void du_dir_down(char *);
void du_dir_up();
void du_x(char *,int);
void du_printf();
void find_(int, char *[]);
void find_x(char *,char *);
void find_printf(char *);

char du_dir[Max_Length];
int du_dir_len,du_start,find_num;
int main( int ac , char *av[] )
{
        char *cmd;
        ac=4;
        av[0]="./cmd";
        av[1]="-find";
        av[2]="arphic";
        av[3]="/home";

ac--;
if(ac==0){printf("lack of parametern");return 0;}
cmd=*++av;
if(cmd[0]!='-'){printf("please input the type of commondn");return 0;}
if(cmd[1]=='d'&&cmd[2]=='u')
{
du_(ac,av);
return 1;
}
        if(cmd[1]=='f'&&cmd[2]=='i'&&cmd[3]=='n'&&cmd[4]=='d')
{
find_(ac,av);
return 1;
}
printf("commond %s not foundn",cmd);
return 0;
}
void find_(int ac , char *av[])
{
    char *file_name;
    char *dir;
    if(ac==1)
    {
        printf("please input the name of the file that looking for");
        return;
    }
    ac--;file_name=*++av;
    if(ac==1)find_x(".",file_name);
    else find_x(*++av,file_name);
}
void find_x(char *dirname,char *search_name)//和du函数共用全局变量
{
        int i,len;
        DIR *dir_ptr;
        char *file_name;
struct dirent *direntp;
        
find_num=0;
for(len=0;dirname[len]!='';len++);
if(dirname[len-1]=='/')len--;
du_dir_len=len;
for(i=0;id_name;
if(file_name[0]=='.')continue;//跳过隐藏、自身或父文件
                        if(strstr(file_name,search_name)!=NULL);
                        {
                            printf("%s/%sn",du_dir,file_name);
                            find_num++;
                        }
du_dir_down(file_name);
find_printf(search_name);
}
closedir(dir_ptr);
}

}

void find_printf(char *search_name)
{
DIR *dir_ptr;
char *file_name;
struct dirent *direntp;
struct stat info;
if((dir_ptr=opendir(du_dir))==NULL)
        {   du_dir_up();    return;}
else{
while((direntp=readdir(dir_ptr))!=NULL)
{
file_name=direntp->d_name;
if(file_name[0]=='.')continue;//跳过隐藏、自身或父文件
                        if(strstr(file_name,search_name)!=NULL);
                        {
                            printf("%s/%sn",du_dir,file_name);
                            find_num++;
                        }
du_dir_down(file_name);
du_printf();
}
closedir(dir_ptr);
}
du_dir_up();
}


//du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_du_
void du_( int ac , char *av[] )
{
int mode=0;
char *cmd;
if(ac==1)du_x(".",0);
        else
        {
            cmd=*(av+1);
            if(cmd[0]=='-')
            {
                ac--;
av++;
if(cmd[1]=='s')
{
mode=1;
}
                else printf("commond %s not foundn",cmd);
                if(ac==1)du_x(".",mode);
            }
            while(--ac)
                du_x(*++av,mode);
        }
}
void du_dir_down(char file_name[])
{
int i;
        du_dir[du_dir_len]='/';
for(i=0;file_name[i]!='';i++)
         du_dir[du_dir_len+i+1]=file_name[i];
        du_dir_len=du_dir_len+i+1;
du_dir[du_dir_len]='';
}
void du_dir_up()
{
for(;du_dir[du_dir_len]!='/';du_dir_len--);
du_dir[du_dir_len]='';
}
void du_x(char *dirname,int mode)
{ int i,len;
DIR *dir_ptr;
char *file_name;
struct dirent *direntp;

for(len=0;dirname[len]!='';len++);
if(dirname[len-1]=='/')len--;
du_dir_len=len;
for(i=0;id_name;
if(file_name[0]=='.')continue;//跳过隐藏、自身或父文件
du_dir_down(file_name);
du_printf(mode);
}
closedir(dir_ptr);
}
}
void du_printf(int mode)
{
DIR *dir_ptr;
char *file_name;
struct dirent *direntp;
struct stat info;
if((dir_ptr=opendir(du_dir))==NULL)
{
if(du_startd_name;
if(file_name[0]=='.')continue;//跳过隐藏、自身或父文件
du_dir_down(file_name);
du_printf(mode);
}
closedir(dir_ptr);
}
du_dir_up();
}

if(strstr(file_name,search_name)!=NULL); 行尾多了个分号
                      {
                            printf("%s/%sn",du_dir,file_name);
                            find_num++;
                        } 
if行尾多了个分号，不管strstr返回什么，大括号里面的都要执行的