sccsfile(4) sccsfile(4)
NAME
sccsfile - format of SCCS file
DESCRIPTION
An SCCS (Source Code Control System) file is an ASCII file.
It consists of six logical parts: the checksum, the delta
table (contains information about each delta), user names
(contains login names and/or numerical group IDs of users who
may add deltas), flags (contains definitions of internal
keywords), comments (contains arbitrary descriptive
information about the file), and the body (contains the actual
text lines intermixed with control lines).
Throughout an SCCS file there are lines which begin with the
ASCII SOH (start of heading) character (octal 001). This
character is hereafter referred to as the control character
and will be represented graphically as @. Any line described
below that is not depicted as beginning with the control
character is prevented from beginning with the control
character.
Entries of the form DDDDD represent a five-digit string (a
number between 00000 and 99999).
Each logical part of an SCCS file is described in detail
below.
Checksum
The checksum is the first line of an SCCS file. The form of
the line is:
@hDDDDD
The value of the checksum is the sum of all characters, except
those of the first line. The @h provides a magic number of
(octal) 064001, depending on byte order.
Delta Table
The delta table consists of a variable number of entries of
one of the following forms:
@s DDDDD/DDDDD/DDDDD
@d <type> <SID> yr/mo/da hr:mi:se <pgmr> DDDDD DDDDD
@i DDDDD ...
@x DDDDD ...
@g DDDDD ...
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@m <MR number>
. . .
@c <comments> . . .
. . .
@e
The first line (@s) contains the number of lines
inserted/deleted/unchanged, respectively. The second line
(@d) contains the type of the delta (normal: D or removed: R),
the SCCS ID of the delta, the date and time of creation of the
delta, the login name corresponding to the real user ID at the
time the delta was created, and the serial numbers of the
delta and its predecessor, respectively.
The @i, @x, and @g lines contain the serial numbers of deltas
included, excluded, and ignored, respectively. These lines
are optional.
The @m lines (optional) each contain one MR number associated
with the delta; the @c lines contain comments associated with
the delta. The @e line ends the delta table entry.
User Names
The list of login names and/or numerical group IDs of users
who may add deltas to the file, separated by new-lines. The
lines containing these login names and/or numerical group IDs
are surrounded by the bracketing lines @u and @U. An empty
list allows anyone to make a delta. Any line starting with a
! prohibits the succeeding group or user from making deltas.
Flags
Keywords used internally. See admin(1) for more information
on their use. Each flag line takes the form:
@f <flag> <optional text>
The following flags are defined:
@f t <type of program>
@f v <program name>
@f i <keyword string>
@f b
@f m <module name>
@f f <floor>
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@f c <ceiling>
@f d <default-sid>
@f n
@f j
@f l <lock-releases>
@f q <user defined>
@f z <reserved for use in interfaces>
The t flag defines the replacement for the %Y% identification
keyword. The v flag controls prompting for MR numbers in
addition to comments; if the optional text is present it
defines an MR number validity checking program. The i flag
controls the warning/error aspect of the ``No id keywords''
message. When the i flag is not present, this message is only
a warning; when the i flag is present, this message causes a
fatal error (the file will not be ``gotten'', or the delta
will not be made). When the b flag is present the -b
keyletter may be used on the get command to cause a branch in
the delta tree. The m flag defines the first choice for the
replacement text of the %M% identification keyword. The f
flag defines the floor release; the release below which no
deltas may be added. The c flag defines the ceiling release;
the release above which no deltas may be added. The d flag
defines the default SID to be used when none is specified on a
get command. The n flag causes delta to insert a null delta
(a delta that applies no changes) in those releases that are
skipped when a delta is made in a new release (for example,
when delta 5.1 is made after delta 2.7, releases 3 and 4 are
skipped). The absence of the n flag causes skipped releases
to be completely empty. The j flag causes get to allow
concurrent edits of the same base SID. The l flag defines a
list of releases that are locked against editing. The q flag
defines the replacement
for the %Q% identification keyword. The z flag is used in
specialized interface programs.
Comments
Arbitrary text is surrounded by the bracketing lines @t and
@T. The comments section typically will contain a description
of the file's purpose.
Body
The body consists of text lines and control lines. Text lines
do not begin with the control character, control lines do.
There are three kinds of control lines: insert, delete, and
end, represented by:
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sccsfile(4) sccsfile(4)
@I DDDDD
@D DDDDD
@E DDDDD
respectively. The digit string is the serial number
corresponding to the delta for the control line.
REFERENCES
admin(1), delta(1), get(1), prs(1)
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