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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (C) 2016 CTERA Networks. All Rights Reserved.
* Author: Amir Goldstein <amir73il@gmail.com>
*/
/*
* t_dir_type
*
* print directory entries and their file type, optionally filtered by d_type
* or by inode number.
*
* ./t_dir_type <path> [u|f|d|c|b|l|p|s|w|<ino>]
*/
#include <fcntl.h>
#include <stdio.h>
#include <unistd.h>
#include <stdint.h>
#include <stdlib.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/syscall.h>
struct linux_dirent64 {
uint64_t d_ino;
int64_t d_off;
unsigned short d_reclen;
unsigned char d_type;
char d_name[0];
};
#define DT_MASK 15
#define DT_MAX 15
unsigned char type_to_char[DT_MAX] = {
[DT_UNKNOWN] = 'u',
[DT_DIR] = 'd',
[DT_REG] = 'f',
[DT_LNK] = 'l',
[DT_CHR] = 'c',
[DT_BLK] = 'b',
[DT_FIFO] = 'p',
[DT_SOCK] = 's',
[DT_WHT] = 'w',
};
#define DT_CHAR(t) type_to_char[(t)&DT_MASK]
#define BUF_SIZE 4096
int
main(int argc, char *argv[])
{
int fd, nread;
char buf[BUF_SIZE];
struct linux_dirent64 *d;
int bpos;
int type = -1; /* -1 means all types */
uint64_t ino = 0;
int ret = 1;
fd = open(argv[1], O_RDONLY | O_DIRECTORY);
if (fd < 0) {
perror("open");
exit(EXIT_FAILURE);
}
if (argc > 2 && argv[2][0]) {
char t = argv[2][0];
for (type = DT_MAX-1; type >= 0; type--)
if (DT_CHAR(type) == t)
break;
/* no match ends up with type = -1 */
if (type < 0)
ino = strtoul(argv[2], NULL, 10);
}
for ( ; ; ) {
nread = syscall(SYS_getdents64, fd, buf, BUF_SIZE);
if (nread == -1) {
perror("getdents");
exit(EXIT_FAILURE);
}
if (nread == 0)
break;
for (bpos = 0; bpos < nread;) {
d = (struct linux_dirent64 *) (buf + bpos);
if ((type < 0 || type == (int)d->d_type) &&
(!ino || ino == d->d_ino)) {
ret = 0;
printf("%s %c\n", d->d_name, DT_CHAR(d->d_type));
}
bpos += d->d_reclen;
}
}
return ret;
}
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