-O ftrunc=tail: trim unused tail after processing actual data.

[tfcrypt.git] / tfc_error.c

diff --git a/tfc_error.c b/tfc_error.c
index 7d21be690123a6ade3bde0b9b8bcb7c45046dcfe..a40ab0ae9bfed2aa8a2a9bc56eefc126444fe0a1 100644 (file)
--- a/tfc_error.c
+++ b/tfc_error.c
@@ -2,7 +2,7 @@
  * tfcrypt -- high security Threefish encryption tool.
  *
  * tfcrypt is copyrighted:
- * Copyright (C) 2012-2018 Andrey Rys. All rights reserved.
+ * Copyright (C) 2012-2019 Andrey Rys. All rights reserved.
  *
  * tfcrypt is licensed to you under the terms of std. MIT/X11 license:
  *
@@ -266,6 +266,7 @@ void usage(void)
        tfc_say("    oseek=val: seek destination file/device by these val bytes.");
        tfc_say("    count=val: process only these val bytes, both input and output.");
        tfc_say("    ftrunc=val: truncate output file to these val bytes before closing it.");
+       tfc_say("    ftrunc=tail: truncate output's tail, leaving only processed data.");
        tfc_say("    xkey=val: take only val bytes from user keyfile.");
        tfc_say("    okey=val: seek the key before reading it (usually a device).");
        tfc_say("    xctr=val: specify size in bytes of initial counter prepended or read.");