+
+/* Look for VALUE in VALLIST, an array of objects of size VALSIZE and
+ return the first corresponding argument in ARGLIST */
+const char *
+argmatch_to_argument (const char *value,
+ const char *const *arglist,
+ const char *vallist, size_t valsize)
+{
+ size_t i;
+
+ for (i = 0; arglist[i]; i++)
+ if (!memcmp (value, vallist + valsize * i, valsize))
+ return arglist[i];
+ return NULL;
+}
+
+#ifdef TEST
+/*
+ * Based on "getversion.c" by David MacKenzie <djm@gnu.ai.mit.edu>
+ */
+char *program_name;
+
+/* When to make backup files. */
+enum backup_type
+{
+ /* Never make backups. */
+ no_backups,
+
+ /* Make simple backups of every file. */
+ simple_backups,
+
+ /* Make numbered backups of files that already have numbered backups,
+ and simple backups of the others. */
+ numbered_existing_backups,
+
+ /* Make numbered backups of every file. */
+ numbered_backups
+};
+
+/* Two tables describing arguments (keys) and their corresponding
+ values */
+static const char *const backup_args[] =
+{
+ "no", "none", "off",
+ "simple", "never",
+ "existing", "nil",
+ "numbered", "t",
+ 0
+};
+
+static const enum backup_type backup_vals[] =
+{
+ no_backups, no_backups, no_backups,
+ simple_backups, simple_backups,
+ numbered_existing_backups, numbered_existing_backups,
+ numbered_backups, numbered_backups
+};
+
+int
+main (int argc, const char *const *argv)
+{
+ const char *cp;
+ enum backup_type backup_type = no_backups;
+
+ program_name = (char *) argv[0];
+
+ if (argc > 2)
+ {
+ fprintf (stderr, "Usage: %s [VERSION_CONTROL]\n", program_name);
+ exit (1);
+ }
+
+ if ((cp = getenv ("VERSION_CONTROL")))
+ backup_type = XARGMATCH ("$VERSION_CONTROL", cp,
+ backup_args, backup_vals);
+
+ if (argc == 2)
+ backup_type = XARGMATCH (program_name, argv[1],
+ backup_args, backup_vals);
+
+ printf ("The version control is `%s'\n",
+ ARGMATCH_TO_ARGUMENT (backup_type, backup_args, backup_vals));
+
+ return 0;
+}
+#endif