RCS files with extension can no longer be read

[Vincent Lefevre]

RCS files with extension, such as those created under RISC OS, can
no longer be read. This is annoying because old archived files are
supposed to still be readable by new versions of software.

I've attached a simple example.

With RCS 5.7:

zira:~> ~/software/rcs-5.7/src/rlog qavinfo,v
rlog: qavinfo,v: warning: Unknown phrases like `type ...;' are present.

RCS file: qavinfo,v
Working file: qavinfo
head: 1.2
branch:
locks: strict
access list:
symbolic names:
keyword substitution: kv
total revisions: 2;     selected revisions: 2
description:
Information on q_av found with the patterns algorithms.
[...]

But with RCS 5.9.4 (under Debian):

zira:~> rlog qavinfo,v

rlog: qavinfo,v:6: missing `desc' keyword
rlog aborted

This file starts with:

------------------------------------------------------------
head    1.2;
access;
symbols;
locks; strict;
comment @# @;
type    102     Perl;


1.2
date    2000.12.04.09.45.03;    author lefevre; state Exp;
branches;
next    1.1;

1.1
date    2000.12.03.17.39.17;    author vlefevre;        state Exp;
branches;
next    ;


desc
@Information on q_av found with the patterns algorithms.
@

[...]
------------------------------------------------------------

If I remove the "type    102     Perl;" line (which is specific
to the RISC OS port in order to record the file type), then the
file can be read by RCS 5.9.4.

-- 
Vincent Lefèvre <address@hidden> - Web: <https://www.vinc17.net/>
100% accessible validated (X)HTML - Blog: <https://www.vinc17.net/blog/>
Work: CR INRIA - computer arithmetic / AriC project (LIP, ENS-Lyon)

qavinfo,v
Description: Text document