1 files changed, 105 insertions, 0 deletions
diff --git a/src/basic/dirent-util.c b/src/basic/dirent-util.c
new file mode 100644
index 0000000..2eea228
--- /dev/null
+++ b/src/basic/dirent-util.c
@@ -0,0 +1,105 @@
+/* SPDX-License-Identifier: LGPL-2.1-or-later */
+
+#include <fcntl.h>
+#include <sys/stat.h>
+
+#include "dirent-util.h"
+#include "path-util.h"
+#include "stat-util.h"
+#include "string-util.h"
+
+static int dirent_ensure_type(DIR *d, struct dirent *de) {
+        STRUCT_STATX_DEFINE(sx);
+        int r;
+
+        assert(d);
+        assert(de);
+
+        if (de->d_type != DT_UNKNOWN)
+                return 0;
+
+        if (dot_or_dot_dot(de->d_name)) {
+                de->d_type = DT_DIR;
+                return 0;
+        }
+
+        /* Let's ask only for the type, nothing else. */
+        r = statx_fallback(dirfd(d), de->d_name, AT_SYMLINK_NOFOLLOW|AT_NO_AUTOMOUNT, STATX_TYPE, &sx);
+        if (r < 0)
+                return r;
+
+        assert(FLAGS_SET(sx.stx_mask, STATX_TYPE));
+        de->d_type = IFTODT(sx.stx_mode);
+
+        /* If the inode is passed too, update the field, i.e. report most recent data */
+        if (FLAGS_SET(sx.stx_mask, STATX_INO))
+                de->d_ino = sx.stx_ino;
+
+        return 0;
+}
+
+bool dirent_is_file(const struct dirent *de) {
+        assert(de);
+
+        if (!IN_SET(de->d_type, DT_REG, DT_LNK, DT_UNKNOWN))
+                return false;
+
+        if (hidden_or_backup_file(de->d_name))
+                return false;
+
+        return true;
+}
+
+bool dirent_is_file_with_suffix(const struct dirent *de, const char *suffix) {
+        assert(de);
+
+        if (!IN_SET(de->d_type, DT_REG, DT_LNK, DT_UNKNOWN))
+                return false;
+
+        if (de->d_name[0] == '.')
+                return false;
+
+        if (!suffix)
+                return true;
+
+        return endswith(de->d_name, suffix);
+}
+
+struct dirent *readdir_ensure_type(DIR *d) {
+        int r;
+
+        assert(d);
+
+        /* Like readdir(), but fills in .d_type if it is DT_UNKNOWN */
+
+        for (;;) {
+                struct dirent *de;
+
+                errno = 0;
+                de = readdir(d);
+                if (!de)
+                        return NULL;
+
+                r = dirent_ensure_type(d, de);
+                if (r >= 0)
+                        return de;
+                if (r != -ENOENT) {
+                        errno = -r; /* We want to be compatible with readdir(), hence propagate error via errno here */
+                        return NULL;
+                }
+
+                /* Vanished by now? Then skip immediately to next */
+        }
+}
+
+struct dirent *readdir_no_dot(DIR *d) {
+        assert(d);
+
+        for (;;) {
+                struct dirent *de;
+
+                de = readdir_ensure_type(d);
+                if (!de || !dot_or_dot_dot(de->d_name))
+                        return de;
+        }
+}