File Formats sccsfile(4)
NAME
sccsfile - format of an SCS history file
DESCRIPTION
An SCS file is an ASCI 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 control
lines.
Each section is described in detail below.
Conventions
Throughout an SCS file there are lines which begin with the
ASCI 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 SCS 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 SCS file. The form of
the line is:
^A hddddd
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File Formats sccsfile(4)
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 SCS 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
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File Formats sccsfile(4)
takes the form:
^Af flag
optional text
The following flags are defined in order of appearance:
^Af t type-of-program Defines the replacement for the
12:24:17 ID keyword.
^Af v program-name Controls prompting for MR numbers
in addition to comments. 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 generate an error
that terminates the SCS command.
Otherwise, the message is treated
as a warning only.
^Af b Indicates that the -b option may be
used with the SCS get command to
create a branch in the delta tree.
^Af m module-name Defines the first choice for the
replacement text of the sccsfile.4
ID keyword.
^Af f floor Defines the "floor" release, that
is, the release below which no del-
tas may be added.
^Af c ceiling Defines the "ceiling" release, that
is, the release above which no del-
tas may be added.
^Af d default-sid The d flag defines the default SID
to be used when none is specified
on an SCS get command.
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File Formats sccsfile(4)
^Af n The n flag enables the SCS 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 SCS get command to
allow concurrent edits of the same
base SID.
^Af l lock-releases Defines a list of releases that are
locked against editing.
^Af q user-defined Defines the replacement for the ID
keyword.
^Af e 01 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 charac-
ters, 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 descrip-
tion 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
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File Formats sccsfile(4)
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)
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