1/* backupfile.h -- declarations for making Emacs style backup file names
2   Copyright (C) 1990-1992, 1997-1999 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   59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
18
19#ifndef BACKUPFILE_H_
20# define BACKUPFILE_H_
21
22/* When to make backup files. */
23enum backup_type
24{
25  /* Never make backups. */
26  none,
27
28  /* Make simple backups of every file. */
29  simple,
30
31  /* Make numbered backups of files that already have numbered backups,
32     and simple backups of the others. */
33  numbered_existing,
34
35  /* Make numbered backups of every file. */
36  numbered
37};
38
39# define VALID_BACKUP_TYPE(Type)	\
40  ((Type) == none			\
41   || (Type) == simple			\
42   || (Type) == numbered_existing	\
43   || (Type) == numbered)
44
45extern char const *simple_backup_suffix;
46
47# ifndef PARAMS
48#  if defined PROTOTYPES || (defined __STDC__ && __STDC__)
49#   define PARAMS(Args) Args
50#  else
51#   define PARAMS(Args) ()
52#  endif
53# endif
54
55char *find_backup_file_name PARAMS ((char const *, enum backup_type));
56enum backup_type get_version PARAMS ((char const *context, char const *arg));
57enum backup_type xget_version PARAMS ((char const *context, char const *arg));
58void addext PARAMS ((char *, char const *, int));
59
60#endif /* ! BACKUPFILE_H_ */
61