#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <dirent.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <time.h>
#define ERR_EXIT(m) \
do { \
perror(m);\
exit(EXIT_FAILURE);\
}while(0)
const char *statbuf_get_perms(struct stat *sbuf);
const char *statbuf_get_date(struct stat *sbuf);
const char *statbuf_get_filename(struct stat *sbuf, const char *name);
const char *statbuf_get_user_info(struct stat *sbuf);
const char *statbuf_get_size(struct stat *sbuf);
int main(int argc, const char *argv[])
{
DIR *dir = opendir(".");
if(dir == NULL)
ERR_EXIT("opendir");
struct dirent *dr;
while((dr = readdir(dir)))
{
const char *filename = dr->d_name;
if(filename[0] == '.')
continue;
char buf[1024] = {0};
struct stat sbuf;
if(lstat(filename, &sbuf) == -1)
ERR_EXIT("lstat");
strcpy(buf, statbuf_get_perms(&sbuf));
strcat(buf, " ");
strcat(buf, statbuf_get_user_info(&sbuf));
strcat(buf, " ");
strcat(buf, statbuf_get_size(&sbuf));
strcat(buf, " ");
strcat(buf, statbuf_get_date(&sbuf));
strcat(buf, " ");
strcat(buf, statbuf_get_filename(&sbuf, filename));
printf("%s\n", buf);
}
closedir(dir);
return 0;
}
const char *statbuf_get_perms(struct stat *sbuf)
{
static char perms[] = "----------";
mode_t mode = sbuf->st_mode;
//文件类型
switch(mode & S_IFMT)
{
case S_IFSOCK:
perms[0] = 's';
break;
case S_IFLNK:
perms[0] = 'l';
break;
case S_IFREG:
perms[0] = '-';
break;
case S_IFBLK:
perms[0] = 'b';
break;
case S_IFDIR:
perms[0] = 'd';
break;
case S_IFCHR:
perms[0] = 'c';
break;
case S_IFIFO:
perms[0] = 'p';
break;
}
//权限
if(mode & S_IRUSR)
perms[1] = 'r';
if(mode & S_IWUSR)
perms[2] = 'w';
if(mode & S_IXUSR)
perms[3] = 'x';
if(mode & S_IRGRP)
perms[4] = 'r';
if(mode & S_IWGRP)
perms[5] = 'w';
if(mode & S_IXGRP)
perms[6] = 'x';
if(mode & S_IROTH)
perms[7] = 'r';
if(mode & S_IWOTH)
perms[8] = 'w';
if(mode & S_IXOTH)
perms[9] = 'x';
if(mode & S_ISUID)
perms[3] = (perms[3] == 'x') ? 's' : 'S';
if(mode & S_ISGID)
perms[6] = (perms[6] == 'x') ? 's' : 'S';
if(mode & S_ISVTX)
perms[9] = (perms[9] == 'x') ? 't' : 'T';
return perms;
}
const char *statbuf_get_date(struct stat *sbuf)
{
static char datebuf[1024] = {0};
struct tm *ptm;
time_t ct = sbuf->st_ctime;
if((ptm = localtime(&ct)) == NULL)
ERR_EXIT("localtime");
const char *format = "%b %e %H:%M"; //时间格式
if(strftime(datebuf, sizeof datebuf, format, ptm) == 0)
{
fprintf(stderr, "strftime error\n");
exit(EXIT_FAILURE);
}
return datebuf;
}
const char *statbuf_get_filename(struct stat *sbuf, const char *name)
{
static char filename[1024] = {0};
//name 处理链接名字
if(S_ISLNK(sbuf->st_mode))
{
char linkfile[1024] = {0};
if(readlink(name, linkfile, sizeof linkfile) == -1)
ERR_EXIT("readlink");
snprintf(filename, sizeof filename, " %s -> %s", name, linkfile);
}else
{
strcpy(filename, name);
}
return filename;
}
const char *statbuf_get_user_info(struct stat *sbuf)
{
static char info[1024] = {0};
snprintf(info, sizeof info, " %3d %8d %8d", sbuf->st_nlink, sbuf->st_uid, sbuf->st_gid);
return info;
}
const char *statbuf_get_size(struct stat *sbuf)
{
static char buf[100] = {0};
snprintf(buf, sizeof buf, "%8lu", (unsigned long)sbuf->st_size);
return buf;
}