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- RCSFILE(5) Unix Programmer's Manual RCSFILE(5)
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- 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 ::= $ | , | . | : | ; | @
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- RCSFILE(5) Unix Programmer's Manual RCSFILE(5)
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- 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.
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- 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.
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