--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/pcsc/connect.c	Sun Mar 14 01:09:23 2021 +0000
@@ -0,0 +1,47 @@
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pcsclite.h>
+#include <winscard.h>
+
+extern SCARDCONTEXT hContext;
+extern char *reader_list;
+extern unsigned select_reader_num;
+
+SCARDHANDLE hCard;
+char *selected_reader;
+
+select_reader_by_num()
+{
+	char *cp;
+	unsigned num;
+
+	for (cp = reader_list, num = 0; *cp; num++) {
+		if (num == select_reader_num) {
+			selected_reader = cp;
+			return(0);
+		}
+		cp += strlen(cp) + 1;
+	}
+	fprintf(stderr,
+		"error: requested reader #%u, but only %u reader(s) found\n",
+		select_reader_num, num);
+	SCardReleaseContext(hContext);
+	exit(1);
+}
+
+connect_to_card()
+{
+	LONG rv;
+	DWORD dwActiveProtocol;
+
+	rv = SCardConnect(hContext, selected_reader, SCARD_SHARE_EXCLUSIVE,
+			  SCARD_PROTOCOL_T0, &hCard, &dwActiveProtocol);
+	if (rv != SCARD_S_SUCCESS) {
+		fprintf(stderr, "SCardConnect: %s\n", pcsc_stringify_error(rv));
+		SCardReleaseContext(hContext);
+		exit(1);
+	}
+	return(0);
+}