--- a/libcommon/cardconnect.c	Fri Feb 12 17:22:25 2021 +0000
+++ b/libcommon/cardconnect.c	Fri Feb 12 17:28:05 2021 +0000
@@ -8,6 +8,7 @@
 SCARDCONTEXT hContext;
 SCARDHANDLE hCard;
 char *reader_list, *selected_reader;
+unsigned select_reader_num;
 
 setup_pcsc_context()
 {
@@ -57,14 +58,13 @@
 	return(0);
 }
 
-select_reader_num(select_num)
-	unsigned select_num;
+select_reader_by_num()
 {
 	char *cp;
 	unsigned num;
 
 	for (cp = reader_list, num = 0; *cp; num++) {
-		if (num == select_num) {
+		if (num == select_reader_num) {
 			selected_reader = cp;
 			return(0);
 		}
@@ -72,7 +72,7 @@
 	}
 	fprintf(stderr,
 		"error: requested reader #%u, but only %u readers found\n",
-		select_num, num);
+		select_reader_num, num);
 	SCardReleaseContext(hContext);
 	exit(1);
 }