C++ Linux输出文件夹下的所有文件信息

//#include "../util.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <stdbool.h>
#include <stdarg.h>
#include <wait.h>
#include <time.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <dirent.h>
#include <pwd.h>
#include <grp.h>

//  properties linknum user group cap date-time name
// 总用量 120K
// -rwxrwxr-x 1 hqyj hqyj  17K 4月   9 16:43 a.out
// drwxrwxr-x 2 hqyj hqyj 4.0K 4月   9 17:11 dkdkd
// -rw-rw-r-- 1 hqyj hqyj   51 4月   9 17:09 dls.c
// -rw-rw-r-- 1 hqyj hqyj  27K 4月   9 16:48 his.txt
// -rw-rw-r-- 1 hqyj hqyj  15K 4月   9 15:00 libstatic0.a
// -rw-rw-r-- 1 hqyj hqyj   56 4月   9 14:55 libstatic0.c
// -rw-rw-r-- 1 hqyj hqyj 1.7K 4月   9 14:59 libstatic0.o
// -rwxrwxr-x 1 hqyj hqyj  22K 4月   9 16:37 libstatic0.so
// -rw-rw-r-- 1 hqyj hqyj  103 4月   9 14:58 test_static0.c
// -rw-rw-r-- 1 hqyj hqyj  12K 4月   9 14:59 util.o

char r(__mode_t m, __mode_t i)
{
    return m & i ? 'r' : '-';
}
char w(__mode_t m, __mode_t i)
{
    return m & i ? 'w' : '-';
}
char x(__mode_t m, __mode_t i)
{
    return m & i ? 'x' : '-';
}

void date_to_str(time_t tt, char d[])
{

    struct tm *t = localtime(&tt);
    sprintf(d, "%d/%02d/%02d %02d:%02d:%02d", t->tm_year + 1900, t->tm_mon + 1, t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
}

int main(int c, char *a[])
{

    if (c < 2)
    {
        perror("args less than 2");
        return -1;
    }
    char *dir = a[1];
    DIR *d = opendir(dir);

    if (!d)
    {
        perror("opendir error");
        return -2;
    }

    char pathname[4096] = {};

    struct dirent *dt = readdir(d);
    struct stat st;
    do
    {
        char *name = dt->d_name;
        if (name[0] != '.')
        {
            strcpy(pathname, dir);
            pathname[strlen(dir)] = '/';
            pathname[strlen(dir) + 1] = '\0';
            strcat(pathname, name);

            char permissions[11] = {};
            int i = 0;

            byte type = dt->d_type;
            switch (type)
            {
            case DT_DIR:
                permissions[i++] = 'd';
                break;
            case DT_REG:
                permissions[i++] = '-';
                break;

            default:
                break;
            }

            lstat(pathname, &st);
            __mode_t mode = st.st_mode;

            permissions[i++] = r(mode, S_IRUSR);
            permissions[i++] = w(mode, S_IWUSR);
            permissions[i++] = x(mode, S_IXUSR);

            permissions[i++] = r(mode, S_IRGRP);
            permissions[i++] = w(mode, S_IWGRP);
            permissions[i++] = x(mode, S_IXGRP);

            permissions[i++] = r(mode, S_IROTH);
            permissions[i++] = w(mode, S_IWOTH);
            permissions[i++] = x(mode, S_IXOTH);

            char date[20] = {};
            date_to_str(st.st_mtime, date);

            printf("%s\t%ld\t%s\t%s\t%ld\t%s\t%s\n", permissions, st.st_nlink, getpwuid(st.st_uid)->pw_name, getgrgid(st.st_gid)->gr_name, st.st_size, date, name);
        }
    } while (dt = readdir(d));

    p_i(closedir(d));

    return 0;
}

//result below
// 55@ubuntu:~/Desktop$ ./a.out .
// -rw-rw-r--      1       hqyj    hqyj    14538   2025/04/09 15:00:02     libstatic0.a
// -rw-rw-r--      1       hqyj    hqyj    27171   2025/04/09 16:48:41     his.txt
// -rw-rw-r--      1       hqyj    hqyj    103     2025/04/09 14:58:07     test_static0.c
// -rw-rw-r--      1       hqyj    hqyj    56      2025/04/09 14:55:57     libstatic0.c
// -rw-rw-r--      1       hqyj    hqyj    1680    2025/04/09 14:59:50     libstatic0.o
// -rwxrwxr-x      1       hqyj    hqyj    22488   2025/04/09 16:37:28     libstatic0.so
// -rw-rw-r--      1       hqyj    hqyj    2841    2025/04/09 19:03:17     dls.c
// drwxrwxr-x      2       hqyj    hqyj    4096    2025/04/09 17:11:20     dkdkd
// -rw-rw-r--      1       hqyj    hqyj    11976   2025/04/09 14:59:50     util.o
// -rwxrwxr-x      1       hqyj    hqyj    23488   2025/04/09 19:03:24     a.out
// 0

55@ubuntu:~/Desktop$ ./a.out .
-rw-rw-r--      1       hqyj    hqyj    14538   2025/04/09 15:00:02     libstatic0.a
-rw-rw-r--      1       hqyj    hqyj    27171   2025/04/09 16:48:41     his.txt
-rw-rw-r--      1       hqyj    hqyj    103     2025/04/09 14:58:07     test_static0.c
-rw-rw-r--      1       hqyj    hqyj    56      2025/04/09 14:55:57     libstatic0.c
-rw-rw-r--      1       hqyj    hqyj    1680    2025/04/09 14:59:50     libstatic0.o
-rwxrwxr-x      1       hqyj    hqyj    22488   2025/04/09 16:37:28     libstatic0.so
-rw-rw-r--      1       hqyj    hqyj    2841    2025/04/09 19:03:17     dls.c
drwxrwxr-x      2       hqyj    hqyj    4096    2025/04/09 17:11:20     dkdkd
-rw-rw-r--      1       hqyj    hqyj    11976   2025/04/09 14:59:50     util.o
-rwxrwxr-x      1       hqyj    hqyj    23488   2025/04/09 19:03:24     a.out
0