/* backupfile.c -- make Emacs style backup file names
- Copyright (C) 1990-1997, 1998 Free Software Foundation, Inc.
+ Copyright (C) 1990-1997, 1998, 1999, 2000 Free Software Foundation, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
# define CLOSEDIR(d) closedir (d)
#endif
-#if STDC_HEADERS
+#if HAVE_STDLIB_H
# include <stdlib.h>
-#else
+#endif
+
+#ifndef HAVE_DECL_GETENV
+"this configure-time declaration test was not run"
+#endif
+#if !HAVE_DECL_GETENV
+char *getenv ();
+#endif
+
+#ifndef HAVE_DECL_MALLOC
+"this configure-time declaration test was not run"
+#endif
+#if !HAVE_DECL_MALLOC
char *malloc ();
#endif
+char *base_name PARAMS ((char const *));
+
#if HAVE_DIRENT_H || HAVE_NDIR_H || HAVE_SYS_DIR_H || HAVE_SYS_NDIR_H
# define HAVE_DIR 1
#else
# define REAL_DIR_ENTRY(dp) 1
#endif
-/* The following test is to work around the gross typo in
- systems like Sony NEWS-OS Release 4.0C, whereby EXIT_FAILURE
- is defined to 0, not 1. */
-#if !EXIT_FAILURE
-# undef EXIT_FAILURE
-# define EXIT_FAILURE 1
-#endif
-
-#ifndef BACKUPFILE_EXIT_FAILURE
-# define BACKUPFILE_EXIT_FAILURE EXIT_FAILURE
-#endif
-
/* The extension added to file names to produce a simple (as opposed
to numbered) backup file name. */
const char *simple_backup_suffix = "~";
}
#endif /* HAVE_DIR */
-static const char *const backup_args[] =
+static const char * const backup_args[] =
{
- "never", "simple", "nil", "existing", "t", "numbered", 0
+ /* In a series of synonyms, present the most meaning full first, so
+ that argmatch_valid be more readable. */
+ "none", "off",
+ "simple", "never",
+ "existing", "nil",
+ "numbered", "t",
+ 0
};
static const enum backup_type backup_types[] =
{
- simple, simple, numbered_existing, numbered_existing, numbered, numbered
+ none, none,
+ simple, simple,
+ numbered_existing, numbered_existing,
+ numbered, numbered
};
-/* Return the type of backup indicated by VERSION.
- Unique abbreviations are accepted. */
+/* Return the type of backup specified by VERSION.
+ If VERSION is NULL or the empty string, return numbered_existing.
+ If VERSION is invalid or ambiguous, fail with a diagnostic appropriate
+ for the specified CONTEXT. Unambiguous abbreviations are accepted. */
enum backup_type
-get_version (const char *version)
+get_version (const char *context, const char *version)
{
- int i;
-
if (version == 0 || *version == 0)
return numbered_existing;
- i = argmatch (version, backup_args);
- if (i < 0)
- {
- invalid_arg ("version control type", version, i);
- exit (BACKUPFILE_EXIT_FAILURE);
- }
- return backup_types[i];
+ else
+ return XARGMATCH (context, version, backup_args, backup_types);
+}
+
+
+/* Return the type of backup specified by VERSION.
+ If VERSION is NULL, use the value of the envvar VERSION_CONTROL.
+ If the specified string is invalid or ambiguous, fail with a diagnostic
+ appropriate for the specified CONTEXT.
+ Unambiguous abbreviations are accepted. */
+
+enum backup_type
+xget_version (const char *context, const char *version)
+{
+ if (version && *version)
+ return get_version (context, version);
+ else
+ return get_version ("$VERSION_CONTROL", getenv ("VERSION_CONTROL"));
}