1 files changed, 64 insertions, 0 deletions
diff --git a/src/basic/dirent-util.h b/src/basic/dirent-util.h
new file mode 100644
index 0000000..0a2fcbf
--- /dev/null
+++ b/src/basic/dirent-util.h
@@ -0,0 +1,64 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+#pragma once
+
+#include <dirent.h>
+#include <errno.h>
+#include <stdbool.h>
+
+#include "macro.h"
+#include "path-util.h"
+
+bool dirent_is_file(const struct dirent *de) _pure_;
+bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) _pure_;
+int dirent_ensure_type(int dir_fd, struct dirent *de);
+
+struct dirent *readdir_ensure_type(DIR *d);
+struct dirent *readdir_no_dot(DIR *dirp);
+
+#define FOREACH_DIRENT_ALL(de, d, on_error)                             \
+        for (struct dirent *(de) = readdir_ensure_type(d);; (de) = readdir_ensure_type(d)) \
+                if (!de) {                                              \
+                        if (errno > 0) {                                \
+                                on_error;                               \
+                        }                                               \
+                        break;                                          \
+                } else
+
+#define FOREACH_DIRENT(de, d, on_error)                                 \
+        FOREACH_DIRENT_ALL(de, d, on_error)                             \
+             if (hidden_or_backup_file((de)->d_name))                   \
+                     continue;                                          \
+             else
+
+/* Maximum space one dirent structure might require at most */
+#define DIRENT_SIZE_MAX CONST_MAX(sizeof(struct dirent), offsetof(struct dirent, d_name) + NAME_MAX + 1)
+
+/* Only if 64-bit off_t is enabled struct dirent + struct dirent64 are actually the same. We require this, and
+ * we want them to be interchangeable to make getdents64() work, hence verify that. */
+assert_cc(_FILE_OFFSET_BITS == 64);
+/* These asserts would fail on musl where the LFS extensions don't exist. They should
+ * always be present on glibc however. */
+#if HAVE_STRUCT_DIRENT64
+assert_cc(sizeof(struct dirent) == sizeof(struct dirent64));
+assert_cc(offsetof(struct dirent, d_ino) == offsetof(struct dirent64, d_ino));
+assert_cc(sizeof_field(struct dirent, d_ino) == sizeof_field(struct dirent64, d_ino));
+assert_cc(offsetof(struct dirent, d_off) == offsetof(struct dirent64, d_off));
+assert_cc(sizeof_field(struct dirent, d_off) == sizeof_field(struct dirent64, d_off));
+assert_cc(offsetof(struct dirent, d_reclen) == offsetof(struct dirent64, d_reclen));
+assert_cc(sizeof_field(struct dirent, d_reclen) == sizeof_field(struct dirent64, d_reclen));
+assert_cc(offsetof(struct dirent, d_type) == offsetof(struct dirent64, d_type));
+assert_cc(sizeof_field(struct dirent, d_type) == sizeof_field(struct dirent64, d_type));
+assert_cc(offsetof(struct dirent, d_name) == offsetof(struct dirent64, d_name));
+assert_cc(sizeof_field(struct dirent, d_name) == sizeof_field(struct dirent64, d_name));
+#endif
+
+#define FOREACH_DIRENT_IN_BUFFER(de, buf, sz)                           \
+        for (void *_end = (uint8_t*) ({ (de) = (buf); }) + (sz);        \
+             (uint8_t*) (de) < (uint8_t*) _end;                         \
+             (de) = (struct dirent*) ((uint8_t*) (de) + (de)->d_reclen))
+
+#define DEFINE_DIRENT_BUFFER(name, sz)                                  \
+        union {                                                         \
+                struct dirent de;                                       \
+                uint8_t data[(sz) * DIRENT_SIZE_MAX];                   \
+        } name