sccsfile(4) File Formats sccsfile(4)NAMEsccsfile - 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 control 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:
^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 corre‐
sponding 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 associated with the
delta. The ^Ac lines contain comments associated 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 characters. The lines contain‐
ing these login names and/or numerical 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
optional text
The following flags are defined in order of appearance:
^Af t type-of-program Defines the replacement for the 15:56:07 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 pro‐
gram.
^Af i Indicates that the `No id keywords' message is
to generate an error that terminates the SCCS
command. Otherwise, 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 sccsfile.4 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.
^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 concur‐
rent 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 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 characters, 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 com‐
ments section typically will contain a description of the file's pur‐
pose.
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 ALSOsccs-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 30 Sep 2002 sccsfile(4)
