--- /tmp/cmd.cc	2021-04-04 23:20:06.720388661 -0400
+++ cmd.cc	2021-04-04 23:14:35.095359251 -0400
@@ -480,8 +480,13 @@
   strcpy( data, "setboard " );
   int i=0;
   while ( epdline[i] != '\n' ) {
-    data[i+9] = epdline[i];
-    ++i;
+    if ((i + 9) < MAXSTR - 1) {
+        data[i+9] = epdline[i];
+        ++i;
+    } else {
+        printf(_("Error reading contents of file '%s'.\n"), token[1]);
+        break;
+    }
   }
   data[i+9] = '\0';
   SetDataToEngine( data );
@@ -504,8 +509,13 @@
   strcpy( data, "setboard " );
   int i=0;
   while ( epdline[i] != '\n' ) {
-    data[i+9] = epdline[i];
-    ++i;
+    if ((i + 9) < MAXSTR - 1) {
+        data[i+9] = epdline[i];
+        ++i;
+    } else {
+        printf(_("Error reading contents of file '%s'.\n"), token[1]);
+        break;
+    }
   }
   data[i+9] = '\0';