C语言实现:服务端客户端命令交互之ls -l命令接口代码

最新推荐文章于 2023-05-03 15:25:54 发布

原创最新推荐文章于 2023-05-03 15:25:54 发布 · 454 阅读

0 ·

CC 4.0 BY-SA版权

文章标签：

#c语言 #linux

本文详细介绍了C语言中如何进行文件系统操作，包括目录读取、文件属性获取及权限字符串转换。通过具体代码实现，展示了如何用C语言枚举目录下的文件，并解析文件的权限、链接数、所有者、组、大小和修改时间。

  1 #include "factory.h"                                                                                                                                                                                                                                                                                                                          
  2 
  3 typedef struct{
  4     int data_len;
  5     char buf[65535];
  6 }train_t,p_train_t;
  7 
  8 
  9 char *trans_file_access_form(void* file_stat);
 10 
 11 int my_ls(char *pwdnow,int newfd){
 12     int ret;
 13     DIR *dir = opendir(pwdnow);
 14     ERROR_CHECK(dir,(DIR*)-1,"opendir");
 15     struct dirent *p = NULL;
 16     struct stat buf;
 17     char *test =(char*)malloc(65535);
 18     int test_size = 0;
 19     train_t train;
 20     while((p=readdir(dir)))
 21     {
 22         if(strcmp(p->d_name,".") && strcmp(p->d_name,".."))
 23         {
 24             ret=stat(p->d_name,&buf);
 25             ERROR_CHECK(ret,-1,"stat");
 26             char *ret_from_ctime = ctime(&buf.st_mtime);
 27             ret_from_ctime[16] = '\0';
 28             ret=sprintf(test+test_size,"%s %ld %s %s %-ld %s %s\n",trans_file_access_form(&buf),buf.st_nlink,getpwuid(buf.st_uid)->pw_name,\
 29                 getgrgid(buf.st_gid)->gr_name,buf.st_size,ret_from_ctime+4,p->d_name);
 30             test_size += ret;
 31         }
 32     }
 33     train.data_len = strlen(test);
 34     memcpy(train.buf,test,train.data_len);
 35     send(newfd,&train,4+train.data_len,0);
 36     closedir(dir);
 37     return 0;
 38 }
 39 char *trans_file_access_form(void* file_stat){
 40     struct stat *buf = (struct stat *)file_stat;
 41     int decimal_form = buf->st_mode & S_IFMT;
 42     char *ret = (char *)calloc(11, sizeof(char));
 43     char types[] = "xwrpcdb-ls";
 44     ret[0] = types[(decimal_form >>= 12) / 2 + 3];
 45     decimal_form = buf->st_mode;
 46     int  pos = 9;
 47     for (int i = 0; i < 3; ++i)
 48     {
 49         for (int j = 0; j < 3; ++j,decimal_form >>= 1)
 50         {
 51             if (decimal_form & 1)
 52             {
 53                 ret[pos--] = types[j];
 54             }
 55             else
 56             {
 57                 ret[pos--] = types[7];
 58             }
 59         }
 60     }
 61     return ret;
 62 }