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/* SPDX-License-Identifier: LGPL-2.1-or-later */
#pragma once
#include <dirent.h>
#include <limits.h>
#include "errno-list.h"
#include "stat-util.h"
#include "macro.h"
typedef enum RecurseDirEvent {
RECURSE_DIR_ENTER, /* only for dir inodes */
RECURSE_DIR_LEAVE, /* only for dir inodes */
RECURSE_DIR_ENTRY, /* only for non-dir inodes */
RECURSE_DIR_SKIP_MOUNT, /* only for dir inodes: when we don't descent into submounts */
RECURSE_DIR_SKIP_DEPTH, /* only for dir inodes: when we reached the max depth */
/* If we hit an error opening/stating an entry, then we'll fire a
* 'RECURSE_DIR_SKIP_{OPEN_DIR|OPEN_INODE|STAT_INODE}_ERROR_BASE + errno' event. In this case 'de'
* will be valid, but the statx data NULL and the inode fd -1. */
RECURSE_DIR_SKIP_OPEN_DIR_ERROR_BASE,
RECURSE_DIR_SKIP_OPEN_DIR_ERROR_MAX = RECURSE_DIR_SKIP_OPEN_DIR_ERROR_BASE + ERRNO_MAX,
RECURSE_DIR_SKIP_OPEN_INODE_ERROR_BASE,
RECURSE_DIR_SKIP_OPEN_INODE_ERROR_MAX = RECURSE_DIR_SKIP_OPEN_INODE_ERROR_BASE + ERRNO_MAX,
RECURSE_DIR_SKIP_STAT_INODE_ERROR_BASE,
RECURSE_DIR_SKIP_STAT_INODE_ERROR_MAX = RECURSE_DIR_SKIP_STAT_INODE_ERROR_BASE + ERRNO_MAX,
_RECURSE_DIR_EVENT_MAX,
_RECURSE_DIR_EVENT_INVALID = -EINVAL,
} RecurseDirEvent;
#define RECURSE_DIR_CONTINUE 0
#define RECURSE_DIR_LEAVE_DIRECTORY INT_MIN
#define RECURSE_DIR_SKIP_ENTRY (INT_MIN+1)
/* Make sure that the negative errno range and these two special returns don't overlap */
assert_cc(RECURSE_DIR_LEAVE_DIRECTORY < -ERRNO_MAX);
assert_cc(RECURSE_DIR_SKIP_ENTRY < -ERRNO_MAX);
/* Prototype for the callback function that is called whenever we enter or leave a dir inode, or find another dir entry. Return values are:
*
* RECURSE_DIR_CONTINUE (i.e. 0) → continue with next entry
* RECURSE_DIR_LEAVE_DIRECTORY → leave current directory immediately, don't process further siblings
* RECURSE_DIR_SKIP_ENTRY → skip this entry otherwise (only makes sense on RECURSE_DIR_ENTER)
* others → terminate iteration entirely, return the specified value (idea is that
* < 0 indicates errors and > 0 indicates various forms of success)
*/
typedef int (*recurse_dir_func_t)(
RecurseDirEvent event,
const char *path, /* Full non-normalized path, i.e. the path specified during recurise_dir() with what we found appended */
int dir_fd, /* fd of the current dir */
int inode_fd, /* fd of the current entry in the current dir (O_DIRECTORY if directory, and O_PATH otherwise, but only if RECURSE_DIR_INODE_FD was set) */
const struct dirent *de, /* directory entry (always valid) */
const struct statx *sx, /* statx data (only if statx_mask was non-zero) */
void *userdata);
typedef enum RecurseDirFlags {
/* Interpreted by readdir_all() */
RECURSE_DIR_SORT = 1 << 0, /* sort file directory entries before processing them */
RECURSE_DIR_IGNORE_DOT = 1 << 1, /* ignore all dot files ("." and ".." are always ignored) */
/* Interpreted by recurse_dir() */
RECURSE_DIR_ENSURE_TYPE = 1 << 2, /* guarantees that 'd_type' field of 'de' is not DT_UNKNOWN */
RECURSE_DIR_SAME_MOUNT = 1 << 3, /* skips over subdirectories that are submounts */
RECURSE_DIR_INODE_FD = 1 << 4, /* passes an opened inode fd (O_DIRECTORY fd in case of dirs, O_PATH otherwise) */
RECURSE_DIR_TOPLEVEL = 1 << 5, /* call RECURSE_DIR_ENTER/RECURSE_DIR_LEAVE once for top-level dir, too, with dir_fd=-1 and NULL dirent */
} RecurseDirFlags;
typedef struct DirectoryEntries {
size_t n_entries;
struct dirent** entries;
size_t buffer_size;
struct dirent buffer[];
} DirectoryEntries;
int readdir_all(int dir_fd, RecurseDirFlags flags, DirectoryEntries **ret);
int recurse_dir(int dir_fd, const char *path, unsigned statx_mask, unsigned n_depth_max, RecurseDirFlags flags, recurse_dir_func_t func, void *userdata);
int recurse_dir_at(int atfd, const char *path, unsigned statx_mask, unsigned n_depth_max, RecurseDirFlags flags, recurse_dir_func_t func, void *userdata);
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