用c语言实现ls -l命令
时间: 2023-12-21 11:22:10 浏览: 39
下面是使用C语言实现`ls -l`命令的示例代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <dirent.h>
#include <sys/stat.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
void print_permissions(mode_t mode) {
printf((S_ISDIR(mode)) ? "d" : "-");
printf((mode & S_IRUSR) ? "r" : "-");
printf((mode & S_IWUSR) ? "w" : "-");
printf((mode & S_IXUSR) ? "x" : "-");
printf((mode & S_IRGRP) ? "r" : "-");
printf((mode & S_IWGRP) ? "w" : "-");
printf((mode & S_IXGRP) ? "x" : "-");
printf((mode & S_IROTH) ? "r" : "-");
printf((mode & S_IWOTH) ? "w" : "-");
printf((mode & S_IXOTH) ? "x" : "-");
}
int main() {
DIR *dir;
struct dirent *entry;
struct stat file_stat;
dir = opendir(".");
if (dir == NULL) {
printf("Cannot open directory.\n");
exit(1);
}
while ((entry = readdir(dir)) != NULL) {
if (stat(entry->d_name, &file_stat) == -1)
continue;
print_permissions(file_stat.st_mode);
printf(" %ld ", file_stat.st_nlink);
struct passwd *pw = getpwuid(file_stat.st_uid);
if (pw != NULL)
printf("%s ", pw->pw_name);
struct group *gr = getgrgid(file_stat.st_gid);
if (gr != NULL)
printf("%s ", gr->gr_name);
printf("%lld ", (long long)file_stat.st_size);
char time_buffer[80];
strftime(time_buffer, 80, "%b %d %H:%M", localtime(&(file_stat.st_mtime)));
printf("%s ", time_buffer);
printf("%s\n", entry->d_name);
}
closedir(dir);
return 0;
}
```
这段代码使用了`dirent.h`、`sys/stat.h`、`pwd.h`和`grp.h`头文件来获取目录和文件的相关信息,并使用了`time.h`头文件来格式化时间。它遍历当前目录下的文件和子目录,并打印出每个文件的相关信息,包括文件类型、权限、链接数、所有者、所属组、文件大小、修改时间和文件名。