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File Formats sccsfile(4)
NAME
sccsfile - format of an SCCS history file
DESCRIPTION
An SCCS file is an ASCII file consisting of six logical
parts:
checksum Character count used for error detection.
delta table Log containing version info and statistics
about each delta.
usernames Login names and/or group IDs of users who
may add deltas.
flags Definitions of internal keywords.
comments Arbitrary descriptive information about the
file.
body the Actual text lines intermixed with con-
trol lines.
Each section is described in detail below.
Conventions
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 as `^A'. If a line described below
is not depicted as beginning with the control character, it
cannot do so and still be within SCCS file format.
Entries of the form ddddd represent a five digit string (a
number between 00000 and 99999).
Checksum
The checksum is the first line of an SCCS file. The form of
the line is:
SunOS 5.10 Last change: 30 Sep 2002 1
File Formats sccsfile(4)
^A hddddd
The value of the checksum is the sum of all characters,
except those contained in the first line. The ^Ah provides a
magic number of (octal) 064001.
Delta Table
The delta table consists of a variable number of entries of
the form:
^As inserted/deleted/unchanged
^Ad type sid yr/mo/da hr:mi:se username serial-number predecessor-sn
^Ai include-list
^Ax exclude-list
^Ag ignored-list
^Am mr-number
...
^Ac comments ...
...
^Ae
The first line (^As) contains the number of lines
inserted/deleted/unchanged respectively. The second line
(^Ad) contains the type of the delta (normal: D and removed:
R), the SCCS ID of the delta, the date and time of creation
of the delta, the user-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 ^Ai,
^Ax, and ^Ag lines contain the serial numbers of deltas
included, excluded, and ignored, respectively. These lines
do not always appear.
The ^Am lines (optional) each contain one MR number associ-
ated with the delta. The ^Ac lines contain comments associ-
ated with the delta.
The ^Ae line ends the delta table entry.
User Names
The list of user-names and/or numerical group IDs of users
who may add deltas to the file, separated by NEWLINE charac-
ters. The lines containing these login names and/or numeri-
cal group IDs are surrounded by the bracketing lines ^Au and
^AU. An empty list allows anyone to make a delta.
Flags
Flags are keywords that are used internally (see sccs-
admin(1) for more information on their use). Each flag line
takes the form:
^Af flag
SunOS 5.10 Last change: 30 Sep 2002 2
File Formats sccsfile(4)
optional text
The following flags are defined in order of appearance:
^Af t type-of-program
Defines the replacement for the %T% ID keyword.
^Af v program-name
Controls prompting for MR numbers in addition to com-
ments. If the optional text is present, it defines an MR
number validity checking program.
^Af i
Indicates that the `No id keywords' message is to gen-
erate an error that terminates the SCCS command. Other-
wise, the message is treated as a warning only.
^Af b
Indicates that the -b option may be used with the SCCS
get command to create a branch in the delta tree.
^Af m module-name
Defines the first choice for the replacement text of the
%M% ID keyword.
^Af f floor
Defines the "floor" release, that is, the release below
which no deltas may be added.
^Af c ceiling
Defines the "ceiling" release, that is, the release
above which no deltas may be added.
SunOS 5.10 Last change: 30 Sep 2002 3
File Formats sccsfile(4)
^Af d default-sid
The d flag defines the default SID to be used when none
is specified on an SCCS get command.
^Af n
The n flag enables the SCCS delta command 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).
^Af j
Enables the SCCS get command to allow concurrent edits
of the same base SID.
^Af l lock-releases
Defines a list of releases that are locked against edit-
ing.
^Af q user-defined
Defines the replacement for the %Q% ID keyword.
^Af e 0|1
The e flag indicates whether a source file is encoded or
not. A 1 indicates that the file is encoded. Source
files need to be encoded when they contain control char-
acters, or when they do not end with a NEWLINE. The e
flag allows files that contain binary data to be checked
in.
Comments
Arbitrary text surrounded by the bracketing lines ^At and
^AT. The comments section typically will contain a
SunOS 5.10 Last change: 30 Sep 2002 4
File Formats sccsfile(4)
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:
^AI ddddd
^AD ddddd
^AE ddddd
respectively. The digit string is the serial number
corresponding to the delta for the control line.
SEE ALSO
sccs-admin(1), sccs-cdc(1), sccs-comb(1), sccs-delta(1),
sccs-get(1), sccs-help(1), sccs-prs(1), sccs-prt(1), sccs-
rmdel(1), sccs-sact(1), sccs-sccsdiff(1), sccs-unget(1),
sccs-val(1), sccs(1), what(1)
SunOS 5.10 Last change: 30 Sep 2002 5
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This page was generated on Wed Sep 12 11:27:31 GMT 2007
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