/* backup.h -- declarations for making Emacs style backup file names Copyright (C) 1992 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it without restriction. 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. */ /* When to make backup files. Analagous to 'version-control' in Emacs. */ enum backup_mode { /* Uninitialized or indeterminate value */ unknown, /* Never make backups. */ none, /* Make simple backups of every file. */ simple, /* Make numbered backups of files that already have numbered backups, and simple backups of the others. */ numbered_existing, /* Make numbered backups of every file. */ numbered }; struct version_control_values { enum backup_mode value; char *name; }; /* Determine the value of `version_control' by looking in the environment variable "VERSION_CONTROL". Defaults to numbered_existing. */ extern enum backup_mode version_control_value (); /* Initialize information used in determining backup filenames. */ extern void initialize_backups (); /* Make a backup copy of FILE, taking into account version-control. See the description at the beginning of the file for details. */ extern void make_backup ();