--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/duart28/main.c	Sat Sep 09 17:53:21 2023 +0000
@@ -0,0 +1,77 @@
+/*
+ * Main module for fc-duart28-conf utility.
+ */
+
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include <usb.h>
+
+extern struct usb_device *find_duart28_usbdev();
+
+oper_find()
+{
+	struct usb_device *dev;
+
+	dev = find_duart28_usbdev();
+	if (!dev)
+		printf("No DUART28 adapter found\n");
+	return 0;
+}
+
+oper_check_eeprom()
+{
+	fprintf(stderr, "error: check-eeprom command not yet implemented\n");
+	exit(1);
+}
+
+oper_program(newconf)
+{
+	fprintf(stderr, "error: set command not yet implemented\n");
+	exit(1);
+}
+
+main(argc, argv)
+	char **argv;
+{
+	if (argc < 2)
+		return oper_find();
+	if (!strcmp(argv[1], "find")) {
+		if (argc != 2) {
+			fprintf(stderr,
+				"error: %s find command takes no arguments\n",
+				argv[0]);
+			exit(1);
+		}
+		return oper_find();
+	}
+	if (!strcmp(argv[1], "check-eeprom")) {
+		if (argc != 2) {
+			fprintf(stderr,
+			"error: %s check-eeprom command takes no arguments\n",
+				argv[0]);
+			exit(1);
+		}
+		return oper_check_eeprom();
+	}
+	if (!strcmp(argv[1], "set")) {
+		if (argc != 3) {
+			fprintf(stderr,
+				"error: %s set command takes 1 argument\n",
+				argv[0]);
+			exit(1);
+		}
+		if (!strcmp(argv[2], "C") || !strcmp(argv[2], "S"))
+			return oper_program(argv[2][0]);
+		if (!strcmp(argv[2], "c") || !strcmp(argv[2], "s"))
+			return oper_program(toupper(argv[2][0]));
+		fprintf(stderr, "error: %s set argument must be C or S\n",
+			argv[0]);
+		exit(1);
+	}
+	fprintf(stderr, "%s error: non-understood command \"%s\"\n", argv[0],
+		argv[1]);
+	exit(1);
+}