.Id $Id: rcsfile.5,v 5.1 1991/08/19 03:13:55 eggert Exp $
rcsfile \- format of RCS file
contents are described by the grammar
The text is free format: space, backspace, tab, newline, vertical
tab, form feed, and carriage return (collectively,
have no significance except in strings.
However, an \*r file must end in a newline character.
otherwise, strings may contain arbitrary binary data.
The meta syntax uses the following conventions: `|' (bar) separates
alternatives; `{' and `}' enclose optional phrases; `{' and `}*' enclose
phrases that may be repeated zero or more times;
`{' and '}+' enclose phrases that must appear at least once and may be
nonterminal symbols are in
.nr y \w'{ \f3comment\fP'
.ta \w'\f2deltatext\fP 'u +\w'::= 'u +\nxu+\w' 'u
\f2rcstext\fP ::= \f2admin\fP {\f2delta\fP}* \f2desc\fP {\f2deltatext\fP}*
\f2admin\fP ::= \f3head\fP {\f2num\fP}\f3;\fP
{ \f3branch\fP {\f2num\fP}\f3;\fP }
\f3access\fP {\f2id\fP}*\f3;\fP
\f3symbols\fP {\f2id\fP \f3:\fP \f2num\fP}*\f3;\fP
\f3locks\fP {\f2id\fP \f3:\fP \f2num\fP}*\f3;\fP {\f3strict ;\fP}
{ \f3comment\fP {\f2string\fP}\f3;\fP }
{ \f3expand\fP {\f2string\fP}\f3;\fP }
\f2delta\fP ::= \f2num\fP
\f3date\fP \f2num\fP\f3;\fP
\f3author\fP \f2id\fP\f3;\fP
\f3state\fP {\f2id\fP}\f3;\fP
\f3branches\fP {\f2num\fP}*\f3;\fP
\f3next\fP {\f2num\fP}\f3;\fP
\f2desc\fP ::= \f3desc\fP \f2string\fP
\f2deltatext\fP ::= \f2num\fP
\f2num\fP ::= {\f2digit\fP{\f3.\fP}}+
\f2digit\fP ::= \f30\fP | \f31\fP | .\|.\|. | \f39\fP
\f2id\fP ::= \f2letter\fP{\f2idchar\fP}*
\f2letter\fP ::= any letter
\f2idchar\fP ::= any visible graphic character except \f2special\fP
\f2special\fP ::= \f3$\fP | \f3,\fP | \f3.\fP | \f3:\fP | \f3;\fP | \f3@\fP
\f2string\fP ::= \f3@\fP{any character, with \f3@\fP doubled}*\f3@\fP
\f2newphrase\fP ::= \f2id\fP \f2word\fP* \f3;\fP
\f2word\fP ::= \f2id\fP | \f2num\fP | \f2string\fP | \f3:\fP
Identifiers are case sensitive. Keywords are in lower case only.
The sets of keywords and identifiers may overlap.
In most environments RCS uses the ISO 8859/1 encoding:
letters are octal codes 101\-132, 141\-172, 300\-326, 330\-366 and 370-377,
visible graphic characters are codes 041\-176 and 240\-377,
and white space characters are codes 010\-015 and 040.
productions in the grammar are reserved for future extensions
to the format of \*r files.
will begin with any keyword already in use.
nodes form a tree. All nodes whose numbers
(e.g., 2.3, 2.1, 1.3, etc.)
are on the trunk, and are linked through the
field in order of decreasing numbers.
node points to the head of that sequence (i.e., contains
node in the admin node indicates the default
branch (or revision) for most \*r operations.
branch is the highest branch on the trunk.
nodes whose numbers consist of
(e.g., 3.1.1.1, 2.1.2.2, etc.)
number fields are identical are linked through the
field in order of increasing numbers.
node whose number is identical to the first
number fields of the deltas on that sequence is called the branchpoint.
field of a node contains a list of the
numbers of the first nodes of all sequences for which it is a branchpoint.
This list is ordered in increasing numbers.
/1.2.1.3\ /1.3.1.1\ | | /1.2.2.2\ /1.2.2.1.1.1\
--------- --------- --------- --------- -------------
/ \ ---------\ / / \-----------
----------------------\ /---------
Purdue University, West Lafayette, IN, 47907.
Revision Number: \*(Rv; Release Date: \*(Dt.
Copyright \(co 1982, 1988, 1989 by Walter F. Tichy.
Copyright \(co 1990, 1991 by Paul Eggert.
ci(1), co(1), ident(1), rcs(1), rcsdiff(1), rcsmerge(1), rlog(1),
\*r\*-A System for Version Control,
.I "Software\*-Practice & Experience"