--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/simtool/erasefile.c	Sat Mar 06 22:55:21 2021 +0000
@@ -0,0 +1,109 @@
+/*
+ * This module implements the erase-file command.
+ */
+
+#include <sys/types.h>
+#include <ctype.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <strings.h>
+#include "curfile.h"
+
+static
+erase_transparent(fill_byte)
+{
+	u_char data[255];
+	unsigned off, cc;
+	int rc;
+
+	memset(data, fill_byte, 255);
+	for (off = 0; off < curfile_total_size; off += cc) {
+		cc = curfile_total_size - off;
+		if (cc > 255)
+			cc = 255;
+		rc = update_bin_op(off, data, cc);
+		if (rc < 0)
+			return(rc);
+	}
+	return(0);
+}
+
+static
+erase_records(fill_byte)
+{
+	u_char data[255];
+	unsigned recno;
+	int rc;
+
+	memset(data, fill_byte, curfile_record_len);
+	for (recno = 1; recno <= curfile_record_count; recno++) {
+		rc = update_rec_op(recno, 0x04, data, curfile_record_len);
+		if (rc < 0)
+			return(rc);
+	}
+	return(0);
+}
+
+static
+erase_cyclic(fill_byte)
+{
+	u_char data[255];
+	unsigned count;
+	int rc;
+
+	memset(data, fill_byte, curfile_record_len);
+	for (count = 0; count < curfile_record_count; count++) {
+		rc = update_rec_op(0, 0x03, data, curfile_record_len);
+		if (rc < 0)
+			return(rc);
+	}
+	return(0);
+}
+
+cmd_erase_file(argc, argv)
+	char **argv;
+{
+	int file_id, rc;
+	unsigned fill_byte;
+
+	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
+		file_id = find_symbolic_file_name(argv[1]);
+	if (file_id < 0) {
+		fprintf(stderr,
+"error: file ID argument is not a hex value or a recognized symbolic name\n");
+		return(-1);
+	}
+	rc = select_op(file_id);
+	if (rc < 0)
+		return(rc);
+	rc = parse_ef_select_response();
+	if (rc < 0)
+		return(rc);
+	if (argc > 2) {
+		fill_byte = strtoul(argv[2], 0, 0);
+		if (fill_byte > 0xFF) {
+			fprintf(stderr, "error: invalid fill byte argument\n");
+			return(-1);
+		}
+	} else
+		fill_byte = 0xFF;
+	switch (curfile_structure) {
+	case 0x00:
+		/* transparent */
+		rc = erase_transparent(fill_byte);
+		break;
+	case 0x01:
+		/* record-based */
+		rc = erase_records(fill_byte);
+		break;
+	case 0x03:
+		/* cyclic */
+		rc = erase_cyclic(fill_byte);
+		break;
+	}
+	return(rc);
+}