listamsb: support "locked" programs.

1 files changed, 27 insertions, 4 deletions

diff --git a/listamsb.1 b/listamsb.1
index 112febd..cc12fb1 100644
--- a/listamsb.1
+++ b/listamsb.1
@@ -27,7 +27,7 @@ level margin: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .\" new: \\n[rst2man-indent\\n[rst2man-indent-level]]
 .in \\n[rst2man-indent\\n[rst2man-indent-level]]u
 ..
-.TH "LISTAMSB" 1 "2025-02-26" "0.2.1" "Urchlay's Atari 8-bit Tools"
+.TH "LISTAMSB" 1 "2025-02-27" "0.2.1" "Urchlay's Atari 8-bit Tools"
 .SH NAME
 listamsb \- List the source of a tokenized Atari Microsoft BASIC program
 .SH SYNOPSIS
@@ -50,6 +50,10 @@ is the same for both versions, so there\(aqs no need to specify it.
 \fBinput\-file\fP must be a tokenized AMSB program. If no \fBinput\-file\fP is given,
 input is read from stdin.
 .sp
+Programs created with \fISAVE "filename" LOCK\fP are autodetected,
+and will be listed normally. It\(aqs also possible to convert a LOCKed
+program to an unencrypted one, with the \fB\-l\fP option.
+.sp
 Output is to stdout. Use shell redirection to save the output to a file.
 .SH OPTIONS
 .INDENT 0.0
@@ -71,6 +75,25 @@ If the start line number is omitted (e.g. \fB,100\fP), it will be treated as
 number is omitted (e.g. \fB100,\fP), it means "list until the end of the program".
 \fB\-r,\fP is equivalent to not using the \fB\-r\fP option at all.
 .TP
+.B \fB\-l\fP
+"Lock" or "unlock" the program. Locked programs are created with
+\fISAVE "filename" LOCK\fP\&. The "encryption" is reversible: locking and
+unlocking are the same operation. The output will be the unlocked tokenized
+program (rather than a listing), and you must
+use redirection to save it to a file. Example:
+.INDENT 7.0
+.INDENT 3.5
+.sp
+.nf
+.ft C
+listamsb \-u LOCKED.AMB > UNLOCKED.AMB
+.ft P
+.fi
+.UNINDENT
+.UNINDENT
+.sp
+None of the other options have any effect with \fB\-u\fP\&.
+.TP
 .B \fB\-v\fP
 Verbose output, on stderr.
 .TP
@@ -94,10 +117,10 @@ generally mean the input isn\(aqt actually an tokenized Atari Microsoft
 BASIC file.
 .INDENT 0.0
 .IP \(bu 2
-not an AMSB file: first byte not $00
+not an AMSB file: first byte not $00 or $01
 .sp
-Pretty self\-explanatory: if the file doesn\(aqt begin with a \fI$00\fP byte,
-it\(aqs not a tokenized AMSB file.
+Pretty self\-explanatory: if the file doesn\(aqt begin with a \fI$00\fP or
+\fI$01\fP byte, it\(aqs not a tokenized AMSB file.
 .IP \(bu 2
 not an AMSB file: too big (\fIN\fP bytes), won\(aqt fit in Atari memory
 .sp