--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/select.c	Sun Jan 24 00:32:10 2021 +0000
@@ -0,0 +1,71 @@
+#include <sys/types.h>
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <pcsclite.h>
+#include <winscard.h>
+#include "globals.h"
+
+select_op(file_id)
+	unsigned file_id;
+{
+	u_char cmd[7];
+	int rc;
+	unsigned expect_resp_len;
+
+	/* SELECT command APDU */
+	cmd[0] = 0xA0;
+	cmd[1] = 0xA4;
+	cmd[2] = 0;
+	cmd[3] = 0;
+	cmd[4] = 2;
+	cmd[5] = file_id >> 8;
+	cmd[6] = file_id;
+	rc = apdu_exchange(cmd, 7);
+	if (rc < 0)
+		return(rc);
+	if ((sim_resp_sw & 0xFF00) != 0x9F00) {
+		fprintf(stderr,
+		"error or unexpected SW response to SELECT of 0x%04X: %04X\n",
+			file_id, sim_resp_sw);
+		return(-1);
+	}
+	expect_resp_len = sim_resp_sw & 0xFF;
+	/* GET RESPONSE follow-up */
+	cmd[1] = 0xC0;
+	cmd[4] = expect_resp_len;
+	rc = apdu_exchange(cmd, 5);
+	if (rc < 0)
+		return(rc);
+	if (sim_resp_sw != 0x9000) {
+		fprintf(stderr,
+			"bad SW resp to GET RESPONSE after SELECT: %04X\n",
+			sim_resp_sw);
+		return(-1);
+	}
+	if (sim_resp_data_len != expect_resp_len) {
+		fprintf(stderr,
+	"error: GET RESPONSE after SELECT returned %u bytes, expected %u\n",
+			sim_resp_data_len, expect_resp_len);
+		return(-1);
+	}
+	return(0);
+}
+
+cmd_select(argc, argv)
+	char **argv;
+{
+	unsigned file_id;
+
+	if (isxdigit(argv[1][0]) && isxdigit(argv[1][1]) &&
+	    isxdigit(argv[1][2]) && isxdigit(argv[1][3]) && !argv[1][4])
+		file_id = strtoul(argv[1], 0, 16);
+	else {
+		fprintf(stderr,
+			"select: only hex file IDs are currently supported\n");
+		return(-1);
+	}
+	return select_op(file_id);
+}