Linux下ls指令的簡單實作



  #include <stdio.h>

#include <sys/stat.h>

#include <sys/types.h>

#include <unistd.h>

#include <sys/types.h>

#include <dirent.h>

#include <string.h>

#include <time.h>

#include <pwd.h>

#include <grp.h>

#include <stdlib.h>

void rm(char *pathname) {

       struct stat buf;

       if (stat(pathname, &buf) == -1) {

              printf("path not exist\n");

              return;

       }

      if (S_ISREG(buf.st_mode)) {

            unlink(pathname);

           printf("remove file:%s\n", pathname);

     } else if (S_ISDIR(buf.st_mode)) {

           DIR *pdir = opendir(pathname);

          struct dirent *pdirent = NULL;

         while ((pdirent = readdir(pdir)) != NULL) {

                if (strcmp(pdirent->d_name, ".") == 0 || strcmp(pdirent->d_name,

                "..") == 0)

                    continue;

                char temp[128] = { '\0' };

            //strcat(temp,pathname);

            //strcat(temp,"/");

             //strcat(temp,pdirent->d_name);

              sprintf(temp, "%s/%s", pathname, pdirent->d_name);

           rm(temp);

  }

  rmdir(pathname);

  printf("remove directory:%s\n", pathname);

  closedir(pdir);

 }

}

void ls_file(char *dirname, char *filename) {

 char temp[128] = { '\0' };

 sprintf(temp, "%s/%s", dirname, filename);

 char perms[11] = "----------";

 struct stat buf;

 if (stat(temp, &buf) == -1) {

  printf("path not exist\n");

  return;

 }

 switch (buf.st_mode & S_IFMT) {

 case S_IFREG:

  perms[0] = '-';

  break;

 case S_IFDIR:

  perms[0] = 'd';

  break;

 case S_IFLNK:

  perms[0] = 'l';

  break;

 case S_IFBLK:

  perms[0] = 'b';

  break;

 case S_IFCHR:

  perms[0] = 'c';

  break;

 case S_IFSOCK:

  perms[0] = 's';

  break;

 default:

  break;

 }

 if (buf.st_mode & S_IRUSR)

  perms[1] = 'r';

 if (buf.st_mode & S_IWUSR)

  perms[2] = 'w';

 if (buf.st_mode & S_IXUSR)

  perms[3] = 'x';

 if (buf.st_mode & S_IRGRP)

  perms[4] = 'r';

 if (buf.st_mode & S_IWGRP)

  perms[5] = 'w';

 if (buf.st_mode & S_IXGRP)

  perms[6] = 'x';

 if (buf.st_mode & S_IROTH)

  perms[7] = 'r';

 if (buf.st_mode & S_IWOTH)

  perms[8] = 'w';

 if (buf.st_mode & S_IXOTH)

  perms[9] = 'x';

 struct tm *tm = localtime(&buf.st_mtime);

 char file[30] = { '\0' };

 strftime(file, sizeof(file), "%m-%d %H:%M", tm);

 printf("%s %2d %s %s %10ld %s %s\n", perms, buf.st_nlink, getpwuid(

   buf.st_uid)->pw_name, getgrgid(buf.st_gid)->gr_name, buf.st_size,

   file, filename);

}

char* split(char *src,char *right)

{

      char *temp = malloc(32);

      strcpy(temp,src);

      char *p = strrchr(temp,'/');

      *p = '\0';

      p++;

     strcpy(right,p);

 return temp;

}

void ls(char *pathname) {

 struct stat buf;

 if (stat(pathname, &buf) == -1) {

  printf("path not exist\n");

  return;

 }

 if (S_ISREG(buf.st_mode)) {

  char name[20]={'\0'};

  char *temp = split(pathname,name);

  ls_file(temp, name);

  free(temp);

 } else if (S_ISDIR(buf.st_mode)) {

  DIR *pdir = opendir(pathname);

  struct dirent *pdirent = NULL;

  while ((pdirent = readdir(pdir)) != NULL) {

   ls_file(pathname, pdirent->d_name);

  }

  closedir(pdir);

 }

}

int main(int argc, char *argv[]) {

 char a[30]="/wepull/a.txt";

 char b[30]={'\0'};

 char *c = split(a,b);

 printf("content:%s,%s\n",c,b);

 ls("/bak/a.txt");//你的目錄名

 ls("/bak");

 return 0;

}