Using LINUX-C programming to implement simple LS commands

Using LINUX-C programming to implement simple LS commands
The specific code is as follows:
The loaded header file has stdio.h,sys/types.h,dirent.h,unistd.h,sys/stat.h,fcntl.h,string.h and so on.

Void main (INT ARGC,CHAR **ARGV) {     dir *dir;      struct dirent *rdir;     struct stat statbuf;      char * buffer= "/";      char *file_; char  *p;     int lenght=strlen (Argv[argc-1]);    int  len=argc;     char parameter[]={' i ', ' t ', ' a ', ' u ', ' G ', ' B ', ' s '}; //parameter group       if (argc==1 | | Strstr (Argv[argc-1],buffer) ==null) {         argv[argc++]= "./";          dir=opendir ("./");  //Open catalog File       }else{         dir=opendir (Argv[argc-1]);         file_=argv[argc-1]; //Open Catalog Files      }     while (Rdir=readdir (dir))!=null) { //read directory or file in directory           if (LEN!=ARGC) {              file_=rdir->d_name; //remove file name from Struct dirent structure           }else{             p= Rindex (File_, '/');              if (strlen (p)! = 1) {                  strcat (File_,buffer);             }              strcat (File_,rdir->d_name);          }         int  file=open (file_,o_rdonly,0);  //Open File          stat (file_,&statbuf);  // The stat function reads the state information of the file in the struct stat  structure, which contains the file's genus, owner, permission, timestamp, file size, and so on.       int tmp=1;      while (TMP<ARGC) {         if (Rindex (argv[tmp],parameter[0])!=NULL) {              printf ("%10d", Rdir->d_ino);         }        if (Rindex (argv[tmp],parameter[1 ]) {!=null) {              printf ("%10d"), Statbuf.st_atime);        }         if (Rindex (argv[tmp],parameter[2])!=null) {              printf ("%10d", Rdir->d_ino);               printf ("%20d", Statbuf.st_atime);              printf ("%10d", Statbuf.st_uid);              printf ("%10d", Statbuf.st_gid);             printf ("%10d", Statbuf.st_blocks);             printf ("%10d", Statbuf.st_size);         }        if (Rindex (argv[tmp],parameter[3 ]) {!=null) {             printf ("%10d"), STATBUF.ST_UID);        }         if (Rindex (argv[tmp],parameter[4])!=null) {              printf ("%10d", statBuf.st_gid);        }         if (Rindex (argv[tmp],parameter[5])!=null) {             printf ("%10d", Statbuf.st_blocks);        }         if (Rindex (argv[tmp],parameter[6])!=null) {             printf ("%10d", Statbuf.st_size);         }        tmp++;    }     Close (file);       //closes the Open file     if (LEN!=ARGC) {         int j=strlen (File_);         while (J>=lenght) {            file_[j--]=null;         }    }    printf ("%20s\n", Rdir->d_name);     }    closedir (dir);      //Close Open Directory}

/*

struct STAT {mode_t st_mode;//file corresponding mode, file, directory etc. ino_t St_ino;//inode node number dev_t St_dev;//device number dev_t St_rdev;//Special Equipment number Nlink _t St_nlink; The number of connections to the file uid_t St_uid; File owner gid_t St_gid; The file owner corresponds to the group off_t St_size; Ordinary file, corresponding to the number of file bytes time_t st_atime; The last time the file was visited time_t St_mtime; The last time the content of the file was modified time_t st_ctime; File status change time blksize_t st_blksize; The file content corresponds to the block size blkcnt_t st_blocks; The number of blocks corresponding to Wei Jian content};

struct drient {   long d_ino;   Index Node Number     off_t  d_off;   offset in catalog file     unsigned short d_reclen;  file name long      unsigned char d_type;  File Type     char d_name [name _max+1];   file name, maximum 255 characters  }int stat (const char *path, struct stat * Struct_stat); Int lstat (const char *path,struct stat *struct_stat); there is also a fstat function. 

The first parameter of two functions is the path of the file, and the second parameter is a pointer to the struct stat. A return value of 0 indicates a successful execution.
*/

This article is from the "Lnsanellinux" blog, make sure to keep this source http://lnsane784.blog.51cto.com/1226518/1930437

Using LINUX-C programming to implement simple LS commands