1/* backupfile.h -- declarations for making Emacs style backup file names
2   Copyright (C) 1990-1992, 1997-1999, 2001-2003 Free Software Foundation, Inc.
3
4   This program is free software; you can redistribute it and/or modify
5   it under the terms of the GNU General Public License as published by
6   the Free Software Foundation; either version 2, or (at your option)
7   any later version.
8
9   This program is distributed in the hope that it will be useful,
10   but WITHOUT ANY WARRANTY; without even the implied warranty of
11   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12   GNU General Public License for more details.
13
14   You should have received a copy of the GNU General Public License
15   along with this program; see the file COPYING.
16   If not, write to the Free Software Foundation,
17   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
18
19#ifndef BACKUPFILE_H_
20# define BACKUPFILE_H_
21
22#ifdef __cplusplus
23extern "C" {
24#endif
25
26
27/* When to make backup files. */
28enum backup_type
29{
30  /* Never make backups. */
31  none,
32
33  /* Make simple backups of every file. */
34  simple,
35
36  /* Make numbered backups of files that already have numbered backups,
37     and simple backups of the others. */
38  numbered_existing,
39
40  /* Make numbered backups of every file. */
41  numbered
42};
43
44# define VALID_BACKUP_TYPE(Type)	\
45  ((Type) == none			\
46   || (Type) == simple			\
47   || (Type) == numbered_existing	\
48   || (Type) == numbered)
49
50extern DLL_VARIABLE char const *simple_backup_suffix;
51
52extern char *find_backup_file_name (char const *file,
53				    enum backup_type backup_type);
54extern enum backup_type get_version (char const *context, char const *arg);
55extern enum backup_type xget_version (char const *context, char const *arg);
56extern void addext (char *filename, char const *ext, char e);
57
58
59#ifdef __cplusplus
60}
61#endif
62
63#endif /* ! BACKUPFILE_H_ */
64