myls

 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
 #include <pwd.h>
 #include <grp.h>
 #include <time.h>
 #include <errno.h>
 #include <dirent.h>
 #include <string.h>
 #include <stdlib.h>

 int llstat(char *p);
 int  astat(char *p);
 int  istat(char *p);
 int  hstat(char *p);
 static int nums;

 int main(int argc, char **argv)
 {
     int c;
     char *optstring = "-laih";
     if(argc < )
         return ;
     while (){
         c = getopt(argc, argv, optstring);
         if(c == -)
             break;
         switch(c){
             case 'l': llstat(argv[]);break;
             case 'a': astat(argv[]);break;
             case 'i': istat(argv[]);break;
             case 'h': hstat(argv[]);break;
         //    case '1': printf("非选项参数\n");break;
             case '?': printf("?\n");break;
             default : break;
         }
     }
     return ;

 }

 //-l
 //文件名->路径
 static char *buf_cat(const char *p, const char *name)
 {
     char *bufcat = malloc();
     memset(bufcat,'\0',);
     strcpy(bufcat,p);
     strcat(bufcat,"/");
     strcat(bufcat,name);
     return bufcat;
 }
 // 判断是否为隐藏文件
 static int is_i(const char *p)
 {
     if(*p == '.')
         return ;
     else
         return ;
 }

 int l_llstat(const char *p, const char *name)
 {
     struct stat mystat;
     struct passwd *pwd = NULL;
     struct group *grp = NULL;
     struct tm *tmp = NULL;
     char *buf=NULL;

     buf = buf_cat(p,name);
     if(lstat(buf,&mystat) == -){
         perror("stat()");
         return ;
     }
     if(is_i(name) == ){
         nums+=mystat.st_blocks/;

         //类型
         switch(mystat.st_mode & S_IFMT){
             case S_IFSOCK : putchar('s');break;
             case S_IFLNK : putchar('l');break;
             case S_IFREG : putchar('-');break;
             case S_IFBLK : putchar('b');break;
             case S_IFDIR : putchar('d');break;
             case S_IFCHR : putchar('c');break;
             case S_IFIFO : putchar('p');break;
             default: break;
         }
         //权限
         if(mystat.st_mode & S_IRUSR)
             putchar('r');
         else
             putchar('-');
         if(mystat.st_mode & S_IWUSR)
             putchar('w');
         else
             putchar('-');
         if(mystat.st_mode & S_IXUSR){
             if(mystat.st_mode & S_ISUID)
                 putchar('s');
             else
                 putchar('x');
         }
         else
             putchar('-');

         if(mystat.st_mode & S_IRGRP)
             putchar('r');
         else
             putchar('-');
         if(mystat.st_mode & S_IWGRP)
             putchar('w');
         else
             putchar('-');
         if(mystat.st_mode & S_IXGRP){
             if(mystat.st_mode & S_ISGID)
                 putchar('s');
             else
                 putchar('x');
         }
         else
             putchar('-');

         if(mystat.st_mode & S_IROTH)
             putchar('r');
         else
             putchar('-');
         if(mystat.st_mode & S_IWOTH)
             putchar('w');
         else
             putchar('-');
         if(mystat.st_mode & S_IXOTH){
             if(mystat.st_mode & S_ISVTX)
                 putchar('t');
             else
                 putchar('x');
         }
         else
             putchar('-');
         //硬链接
         printf(" %ld ", mystat.st_nlink);
         //文件拥有者名
         pwd = getpwuid(mystat.st_uid);
         printf("%s ", pwd->pw_name);
         //文件所有组
         grp = getgrgid(mystat.st_gid);
         printf("%s ",grp->gr_name);
         //总字节个数
         printf("%5ld ", mystat.st_size);
         //获取文件时间
         tmp = localtime(&mystat.st_mtim.tv_sec);
         strftime(buf, , "%m月  %d %H:%M", tmp);
         printf("%s ", buf);
         //文件名
         printf("%s\n", name);
     }
     return ;
 }

 int llstat(char *p)
 {
     DIR *dp = NULL;
     struct dirent *entry = NULL;
     char buf[] = {};
     struct stat mystat1;
     if(lstat(p,&mystat1) == -){
         perror("stat()");
         return ;
     }
     if(S_ISREG(mystat1.st_mode)){
         l_llstat(".", p);
     }else{
         dp = opendir(p);
         if(dp == NULL){
             perror("opendir()");
             return ;
         }

         while(){
             entry = readdir(dp);
             if(NULL == entry){
                 if(errno){
                     perror("readdir()");
                     closedir(dp);
                     return ;
                 }
                 break;
             }
             l_llstat(p, entry->d_name);
         }
         printf("总用量：%d\n", nums);
         closedir(dp);
     }    return ;

 }

 // a

 int a_llstat(const char *p, const char *name)
 {
     struct stat mystat;
     char *buf=NULL;

     buf = buf_cat(p,name);
     if(lstat(buf,&mystat) == -){
         perror("stat()");
         return ;
     }
     //文件名
     printf("%s ", name);
     return ;
 }

 int  astat(char *p)
 {
     struct stat mystat2;
     struct dirent *entry = NULL;
     DIR *dp = NULL;
     if(lstat(p,&mystat2) == -){
         perror("stat()");
         return ;
      }

     if(S_ISREG(mystat2.st_mode)){
         printf("%s ", p);
     }
         dp= opendir(p);
         if(dp == NULL){
             perror("opendir()");
             return ;
         }

         while(){
             entry = readdir(dp);
             if(NULL == entry){
                 if(errno){
                     perror("readdir()");
                     closedir(dp);
                     return ;
                 }
                 break;
             }
             a_llstat(p, entry->d_name);
         }

     closedir(dp);
     printf("\n");
     return ;

 }

 // i

 int i_llstat(const char *p, const char *name)
 {
     struct stat mystat;
     char *buf=NULL;

     buf = buf_cat(p,name);
     if(lstat(buf,&mystat) == -){
         perror("stat()");
         return ;
     }
     printf("%ld  ",mystat.st_ino);
     //文件名
     printf("%s  ", name);
     return ;
 }

 int  istat(char *p)
 {
     struct stat mystat2;
     struct dirent *entry = NULL;
     DIR *dp = NULL;
     if(lstat(p,&mystat2) == -){
         perror("stat()");
         return ;
      }

     if(S_ISREG(mystat2.st_mode)){
         if(is_i(p))
             return ;
         printf("%ld ",mystat2.st_ino);
         printf("%s ", p);
     }
     else{
         dp= opendir(p);
         if(dp == NULL){
             perror("opendir()");
             return ;
         }

         while(){
             entry = readdir(dp);
             if(NULL == entry){
                 if(errno){
                     perror("readdir()");
                     closedir(dp);
                     return ;
                 }
                 break;
             }
             if(is_i(entry->d_name))
                 continue;
             i_llstat(p, entry->d_name);
         }
     }
     closedir(dp);
     printf("\n");
     return ;
 }

 //h
 int  hstat(char *p)
 {
     struct stat mystat2;
     struct dirent *entry = NULL;
     DIR *dp = NULL;
     if(lstat(p,&mystat2) == -){
         perror("stat()");
         return ;
     }

     if(!((mystat2.st_mode & S_IFMT) == S_IFDIR)){
         if(!is_i(p)){
             printf("%s\n", p);
             return ;
         }
     } else{

         dp= opendir(p);
         if(dp == NULL){
             perror("opendir()");
             return ;
         }

         while(){
             entry = readdir(dp);
             if(NULL == entry){
                 if(errno){
                     perror("readdir()");
                     closedir(dp);
                     return ;
                 }
                 break;
             }
         if(is_i(entry->d_name) == )
             printf("%s  ", entry->d_name);
         }
         closedir(dp);
     }
     printf("\n");
     return ;
 }