+/* 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 *context, const char *version)
+{
+ if (version == 0 || *version == 0)
+ return numbered_existing;
+ 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"));