1 files changed, 68 insertions, 0 deletions
diff --git a/lib/backupfile.h b/lib/backupfile.h
new file mode 100644
index 0000000..b496eb9
--- /dev/null
+++ b/lib/backupfile.h
@@ -0,0 +1,68 @@
+/* backupfile.h -- declarations for making Emacs style backup file names
+
+   Copyright (C) 1990-1992, 1997-1999, 2003-2004, 2009-2022 Free Software
+   Foundation, Inc.
+
+   This program is free software: you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
+
+#ifndef BACKUPFILE_H_
+#define BACKUPFILE_H_
+
+/* Get AT_FDCWD, as a convenience for users of this file.  */
+#include <fcntl.h>
+
+#include <stdlib.h>
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+/* When to make backup files. */
+enum backup_type
+{
+  /* Never make backups. */
+  no_backups,
+
+  /* Make simple backups of every file. */
+  simple_backups,
+
+  /* Make numbered backups of files that already have numbered backups,
+     and simple backups of the others. */
+  numbered_existing_backups,
+
+  /* Make numbered backups of every file. */
+  numbered_backups
+};
+
+#define VALID_BACKUP_TYPE(Type) \
+  ((unsigned int) (Type) <= numbered_backups)
+
+extern char const *simple_backup_suffix;
+
+void set_simple_backup_suffix (char const *);
+char *backup_file_rename (int, char const *, enum backup_type)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE;
+char *find_backup_file_name (int, char const *, enum backup_type)
+  _GL_ATTRIBUTE_MALLOC _GL_ATTRIBUTE_DEALLOC_FREE
+  _GL_ATTRIBUTE_RETURNS_NONNULL;
+enum backup_type get_version (char const *context, char const *arg);
+enum backup_type xget_version (char const *context, char const *arg);
+
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* ! BACKUPFILE_H_ */