do_ls1.c~

实现UNIX下的ls全部功能,同时添加了可以生成目录树.实现内容:1.如何读取目录的内容 2.目录排序 3.文件类型以及如何知道文件的类型 4.位操作及掩码的使用 5.用户与组ID数据库 6

#include"globals.h"
void do_ls1(const char *dir, const struct flg opt_flg)
{
  int n,i,total;
  total=0;
  struct dirent **namelist;
  int maxlen;
  if(opt_flg.aflg==3)
    print_name1(dir,opt_flg);
  else 
  {  
    switch(opt_flg.oflg)
    {
      case 0: n=scandir(dir, &namelist, 0, alphasort);break;
      case 1: n=scandir(dir, &namelist, 0, ctimesort);break;
      case 2: n=scandir(dir, &namelist, 0, blocksort);break;
      case 3: n=scandir(dir, &namelist, 0, mtimesort);break;
      case 4: n=scandir(dir, &namelist, 0, atimesort);break;
      case 5: n=scandir(dir, &namelist, 0, revalpsort);break;
    }
    
    if(n<0)
      perror(dir);
    else
    { 
      if(opt_flg.aflg==0)
        for(i=0; i<n; i++){ 
          if(namelist[i]->d_name[0]!='.')  //不显示'.', '..'和以'.'开头的文件
            print_name1(namelist[i]->d_name, opt_flg);
          free(namelist[i]);
        }
        else if(opt_flg.aflg==1)
        {
          for(i=0;i<n;i++){ 
            print_name1(namelist[i]->d_name, opt_flg);
            free(namelist[i]);
          }
        }
        else if(opt_flg.aflg==2) 
        {
          for(i=0;i<n;i++){
            if(strcmp(namelist[i]->d_name, ".")!=0&&strcmp(namelist[i]->d_name, "..")!=0)
              print_name1(namelist[i]->d_name, opt_flg);
            free(namelist[i]);
          }
        }
      printf("\n");
      free(namelist);
    }
  }
 
}
void print_name1(const char *dir, const struct flg opt_flg)
{
  struct stat info;
  static int n=1;
  int m=strlen(dir);
  int v=5;
  if(stat(dir,&info)==-1)
      fprintf(stderr, "Couldn't stat  %s",dir);
  if(opt_flg.iflg==1){
    printf("%8d ", info.st_ino);
    v=3;
    m+=9;
  }
  if(opt_flg.sflg==1){  
    int blocks;
    if(S_ISDIR(info.st_mode))
      blocks=4;
    else 
      blocks=getblocks((long)info.st_size);
    printf("%4d ",blocks);
    v=3;
    m+=5;
  }
  print_filename(dir, info.st_mode);
  if(n%v==0) 
    printf("\n");
  else
  {
    int i;
    for(i=0;i<80/v-m;i++)
    printf(" ");
  }
  n++;
}