lib/getversion.c

   1 /* getversion.c -- select backup filename type
   2    Copyright (C) 1990, 1998 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; if not, write to the Free Software Foundation,
  16    Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  17
  18 /* Written by David MacKenzie <djm@gnu.ai.mit.edu> */
  19
  20 #if HAVE_CONFIG_H
  21 # include <config.h>
  22 #endif
  23
  24 #include "backupfile.h"
  25
  26 #if STDC_HEADERS
  27 # include <stdlib.h>
  28 #endif
  29
  30 int argmatch ();
  31 void invalid_arg ();
  32
  33 extern char *program_name;
  34
  35 static const char *const backup_args[] =
  36 {
  37   "never", "simple", "nil", "existing", "t", "numbered", 0
  38 };
  39
  40 static const enum backup_type backup_types[] =
  41 {
  42   simple, simple, numbered_existing, numbered_existing, numbered, numbered
  43 };
  44
  45 /* Return the type of backup indicated by VERSION.
  46    Unique abbreviations are accepted. */
  47
  48 enum backup_type
  49 get_version (const char *version)
  50 {
  51   int i;
  52
  53   if (version == 0 || *version == 0)
  54     return numbered_existing;
  55   i = argmatch (version, backup_args);
  56   if (i >= 0)
  57     return backup_types[i];
  58   invalid_arg ("version control type", version, i);
  59   exit (1);
  60 }