1/* backupfile.h -- declarations for making Emacs style backup file names
2
3   Copyright (C) 1990, 1991, 1992, 1997, 1998, 1999, 2003, 2004 Free
4   Software Foundation, Inc.
5
6   This program is free software; you can redistribute it and/or modify
7   it under the terms of the GNU General Public License as published by
8   the Free Software Foundation; either version 2, or (at your option)
9   any later version.
10
11   This program is distributed in the hope that it will be useful,
12   but WITHOUT ANY WARRANTY; without even the implied warranty of
13   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14   GNU General Public License for more details.
15
16   You should have received a copy of the GNU General Public License
17   along with this program; see the file COPYING.
18   If not, write to the Free Software Foundation,
19   51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
20
21#ifndef BACKUPFILE_H_
22# define BACKUPFILE_H_
23
24# ifdef __cplusplus
25extern "C" {
26# endif
27
28
29/* When to make backup files. */
30enum backup_type
31{
32  /* Never make backups. */
33  no_backups,
34
35  /* Make simple backups of every file. */
36  simple_backups,
37
38  /* Make numbered backups of files that already have numbered backups,
39     and simple backups of the others. */
40  numbered_existing_backups,
41
42  /* Make numbered backups of every file. */
43  numbered_backups
44};
45
46# define VALID_BACKUP_TYPE(Type)	\
47  ((unsigned int) (Type) <= numbered_backups)
48
49extern char const *simple_backup_suffix;
50
51char *find_backup_file_name (char const *, enum backup_type);
52enum backup_type get_version (char const *context, char const *arg);
53enum backup_type xget_version (char const *context, char const *arg);
54void addext (char *, char const *, int);
55
56
57# ifdef __cplusplus
58}
59# endif
60
61#endif /* ! BACKUPFILE_H_ */
62