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 3 of the License, or
7   (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.  */
16
17#ifndef BACKUPFILE_H_
18# define BACKUPFILE_H_
19
20#ifdef __cplusplus
21extern "C" {
22#endif
23
24
25/* When to make backup files. */
26enum backup_type
27{
28  /* Never make backups. */
29  none,
30
31  /* Make simple backups of every file. */
32  simple,
33
34  /* Make numbered backups of files that already have numbered backups,
35     and simple backups of the others. */
36  numbered_existing,
37
38  /* Make numbered backups of every file. */
39  numbered
40};
41
42# define VALID_BACKUP_TYPE(Type)	\
43  ((Type) == none			\
44   || (Type) == simple			\
45   || (Type) == numbered_existing	\
46   || (Type) == numbered)
47
48extern DLL_VARIABLE char const *simple_backup_suffix;
49
50extern char *find_backup_file_name (char const *file,
51				    enum backup_type backup_type);
52extern enum backup_type get_version (char const *context, char const *arg);
53extern enum backup_type xget_version (char const *context, char const *arg);
54extern void addext (char *filename, char const *ext, char e);
55
56
57#ifdef __cplusplus
58}
59#endif
60
61#endif /* ! BACKUPFILE_H_ */
62