//-rw-rw-r-- 1 username groupname 112 Wed Sep 14 22:08:30 2022 hello.txt
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <pwd.h>
#include <grp.h>
#include <time.h>
#include <string.h>
int main(int argc, char const *argv[])
{
//判断输入的参数是否正确
if (argc < 2)
{
printf("%s filename\n", argv[0]);
return -1;
}
//通过stat函数获取用户传入的文件信息
struct stat st;
int ret = stat(argv[1], &st);
if (ret == -1)
{
perror("stat err");
return -1;
}
//获取文件类型和文件权限
char perms[11] = {0}; //用于保存文件类型和文件权限的字符串
switch (st.st_mode & S_IFMT)
{
case S_IFLNK:
perms[0] = 'l';
break;
case S_IFDIR:
perms[0] = 'd';
break;
case S_IFREG:
perms[0] = '-';
break;
case S_IFBLK:
perms[0] = 'b';
break;
case S_IFCHR:
perms[0] = 'c';
break;
case S_IFSOCK:
perms[0] = 's';
break;
case S_IFIFO:
perms[0] = 'p';
break;
default:
perms[0] = '?';
break;
}
//判断文件访问权限
perms[1] = (st.st_mode & S_IRUSR) ? 'r' : '-';
perms[2] = (st.st_mode & S_IWUSR) ? 'w' : '-';
perms[3] = (st.st_mode & S_IXUSR) ? 'x' : '-';
//文件所在组
perms[4] = (st.st_mode & S_IRGRP) ? 'r' : '-';
perms[5] = (st.st_mode & S_IWGRP) ? 'w' : '-';
perms[6] = (st.st_mode & S_IXGRP) ? 'x' : '-';
//其他人
perms[7] = (st.st_mode & S_IROTH) ? 'r' : '-';
perms[8] = (st.st_mode & S_IWOTH) ? 'w' : '-';
perms[9] = (st.st_mode & S_IXOTH) ? 'x' : '-';
//获取硬链接数
int linkNum = st.st_nlink;
//文件所有者
char *fileUser = getpwuid(st.st_uid)->pw_name;
//文件所在组
char *fileGroup = getgrgid(st.st_gid)->gr_name;
//文件大小
long int fileSize = st.st_size;
//获取修改时间
char *time = ctime(&st.st_mtime);
char mtime[512];
strncpy(mtime, time, strlen(time) - 1);
char buf[1024];
sprintf(buf, "%s %d %s %s %ld %s %s", perms, linkNum, fileUser, fileGroup, fileSize, mtime, argv[1]);
printf("%s\n", buf);
return 0;
}
标签:case,10,perms,st,break,mode,Linux,include,ls
From: https://www.cnblogs.com/anqwjoe/p/16793194.html