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RCSFILE.TXT
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1991-11-10
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RCSFILE(5) Unix Programmer's Manual RCSFILE(5)
NNNAAAMMMEEE
rcsfile - format of RCS file
DDDEEESSSCCCRRRIIIPPPTTTIIIOOONNN
An RCS file's contents are described by the grammar below. The text is
free format: space, backspace, tab, newline, vertical tab, form feed, and
carriage return (collectively, _w_h_i_t_e _s_p_a_c_e) have no significance except
in strings. Strings are enclosed by @@@. If a string contains a @@@, it
must be doubled; 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 repeated; Terminal
symbols are in bbbooollldddfffaaaccceee; nonterminal symbols are in _i_t_a_l_i_c_s.
rcstext ::= admin {delta}* desc {deltatext}*
admin ::= head {num};
{ branch {num}; }
access {id}*;
symbols {id : num}*;
locks {id : num}*; {strict ;}
{ comment {string}; }
{ expand {string}; }
{ newphrase }*
delta ::= num
date num;
author id;
state {id};
branches {num}*;
next {num};
{ newphrase }*
desc ::= desc string
deltatext ::= num
log string
{ newphrase }*
text string
num ::= {digit{.}}+
digit ::= 0 | 1 | ... | 9
id ::= letter{idchar}*
letter ::= any letter
idchar ::= any visible graphic character except special
special ::= $ | , | . | : | ; | @
\*(Dt 1
RCSFILE(5) Unix Programmer's Manual RCSFILE(5)
string ::= @{any character, with @ doubled}*@
newphrase ::= id word* ;
word ::= id | num | string | :
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.
The _n_e_w_p_h_r_a_s_e productions in the grammar are reserved for future
extensions to the format of RCS files. No _n_e_w_p_h_r_a_s_e will begin with any
keyword already in use.
The _d_e_l_t_a nodes form a tree. All nodes whose numbers consist of a single
pair (e.g., 2.3, 2.1, 1.3, etc.) are on the trunk, and are linked
through the nnneeexxxttt field in order of decreasing numbers. The hhheeeaaaddd field in
the _a_d_m_i_n node points to the head of that sequence (i.e., contains the
highest pair). The bbbrrraaannnccchhh node in the admin node indicates the default
branch (or revision) for most RCS operations. If empty, the default
branch is the highest branch on the trunk.
All _d_e_l_t_a nodes whose numbers consist of 2_n fields (_n\(=_2) (e.g.,
3.1.1.1, 2.1.2.2, etc.) are linked as follows. All nodes whose first
2_n-1 number fields are identical are linked through the nnneeexxxttt field in
order of increasing numbers. For each such sequence, the _d_e_l_t_a node
whose number is identical to the first 2_n-2 number fields of the deltas
on that sequence is called the branchpoint. The bbbrrraaannnccchhheeesss 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.
\*(Dt 2
RCSFILE(5) Unix Programmer's Manual RCSFILE(5)
Example:
Head
|
|
v / \
--------- / \
/ \ / \ | | / \ / \
/ \ / \ | 2.1 | / \ / \
/ \ / \ | | / \ / \
/1.2.1.3\ /1.3.1.1\ | | /1.2.2.2\ /1.2.2.1.1.1\
--------- --------- --------- --------- -------------
^ ^ | ^ ^
| | | | |
| | v | |
/ \ | --------- / \ |
/ \ | \ 1.3 / / \ |
/ \ ---------\ / / -----------
/1.2.1.1\ \ / /1.2.2.1\
--------- \ / ---------
^ | ^
| | |
| v |
| --------- |
| \ 1.2 / |
----------------------\ /---------
\ /
\ /
|
|
v
---------
\ 1.1 /
\ /
\ /
\ /
Fig. 1: A revision tree
IIIDDDEEENNNTTTIIIFFFIIICCCAAATTTIIIOOONNN
Author: Walter F. Tichy, Purdue University, West Lafayette, IN, 47907.
Revision Number: 5.0; Release Date: 1990/08/22.
Copyright (c) 1982, 1988, 1989 by Walter F. Tichy.
Copyright (c) 1990 by Paul Eggert.
SSSEEEEEE AAALLLSSSOOO
ci(1), co(1), ident(1), rcs(1), rcsdiff(1), rcsmerge(1), rlog(1),
Walter F. Tichy, RCS--A System for Version Control, _S_o_f_t_w_a_r_e--_P_r_a_c_t_i_c_e &
_E_x_p_e_r_i_e_n_c_e 111555, 7 (July 1985), 637-654.
\*(Dt 3