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- RCSFILE(5) FILE FORMATS RCSFILE(5)
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-
-
- NAME
- rcsfile - format of RCS file
-
- DESCRIPTION
- 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. How-
- ever, an RCS file must end in a newline character.
-
- 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 boldface; nonterminal symbols are in _i_t_a_l_i_c_s.
-
- _r_c_s_t_e_x_t ::= _a_d_m_i_n {_d_e_l_t_a}* _d_e_s_c {_d_e_l_t_a_t_e_x_t}*
-
- _a_d_m_i_n ::= head {_n_u_m};
- { branch {_n_u_m}; }
- access {_i_d}*;
- symbols {_i_d : _n_u_m}*;
- locks {_i_d : _n_u_m}*; {strict ;}
- { comment {_s_t_r_i_n_g}; }
- { expand {_s_t_r_i_n_g}; }
- { _n_e_w_p_h_r_a_s_e }*
-
- _d_e_l_t_a ::= _n_u_m
- date _n_u_m;
- author _i_d;
- state {_i_d};
- branches {_n_u_m}*;
- next {_n_u_m};
- { _n_e_w_p_h_r_a_s_e }*
-
- _d_e_s_c ::= desc _s_t_r_i_n_g
-
- _d_e_l_t_a_t_e_x_t ::= _n_u_m
- log _s_t_r_i_n_g
- { _n_e_w_p_h_r_a_s_e }*
- text _s_t_r_i_n_g
-
- _n_u_m ::= {_d_i_g_i_t{.}}+
-
- _d_i_g_i_t ::= 0 | 1 | ... | 9
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- GNU Last change: 1991/08/19 1
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- RCSFILE(5) FILE FORMATS RCSFILE(5)
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- _i_d ::= _l_e_t_t_e_r{_i_d_c_h_a_r}*
-
- _l_e_t_t_e_r ::= any letter
-
- _i_d_c_h_a_r ::= any visible graphic character except _s_p_e_c_i_a_l
-
- _s_p_e_c_i_a_l ::= $ | , | . | : | ; | @
-
- _s_t_r_i_n_g ::= @{any character, with @ doubled}*@
-
- _n_e_w_p_h_r_a_s_e ::= _i_d _w_o_r_d* ;
-
- _w_o_r_d ::= _i_d | _n_u_m | _s_t_r_i_n_g | :
-
- 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 con-
- sist of a single pair (e.g., 2.3, 2.1, 1.3, etc.) are on the
- trunk, and are linked through the next field in order of
- decreasing numbers. The head field in the _a_d_m_i_n node points
- to the head of that sequence (i.e., contains the highest
- pair). The branch 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)
- (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 next 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
- branches field of a node contains a list of the numbers of
- the first nodes of all sequences for which it is a bran-
- chpoint. This list is ordered in increasing numbers.
-
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- GNU Last change: 1991/08/19 2
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- RCSFILE(5) FILE FORMATS 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
-
- IDENTIFICATION
- Author: Walter F. Tichy, Purdue University, West Lafayette,
- IN, 47907.
- Revision Number: 5.1; Release Date: 1991/08/19.
- Copyright c 1982, 1988, 1989 by Walter F. Tichy.
- Copyright c 1990, 1991 by Paul Eggert.
-
- SEE ALSO
- 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 15, 7 (July 1985), 637-654.
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- GNU Last change: 1991/08/19 3
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