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PROGRAM:
NAME
val — validate SCCS files (DEVELOPMENT)
SYNOPSIS
val −
val [−s] [−m name] [−r SID] [−y type] file...
DESCRIPTION
The val utility shall determine whether the specified file is an SCCS file meeting the
characteristics specified by the options.
OPTIONS
The val utility shall conform to the Base Definitions volume of POSIX.1‐2008, Section
12.2, Utility Syntax Guidelines, except that the usage of the '−' operand is not strictly
as intended by the guidelines (that is, reading options and operands from standard input).
The following options shall be supported:
−m name Specify a name, which is compared with the SCCS %M% keyword in file; see get.
−r SID Specify a SID (SCCS Identification String), an SCCS delta number. A check shall
be made to determine whether the SID is ambiguous (for example, −r 1 is
ambiguous because it physically does not exist but implies 1.1, 1.2, and so on,
which may exist) or invalid (for example, −r 1.0 or −r 1.1.0 are invalid because
neither case can exist as a valid delta number). If the SID is valid and not
ambiguous, a check shall be made to determine whether it actually exists.
−s Silence the diagnostic message normally written to standard output for any error
that is detected while processing each named file on a given command line.
−y type Specify a type, which shall be compared with the SCCS %Y% keyword in file; see
get.
OPERANDS
The following operands shall be supported:
file A pathname of an existing SCCS file. If exactly one file operand appears, and it
is '−', the standard input shall be read: each line shall be independently
processed as if it were a command line argument list. (However, the line is not
subjected to any of the shell word expansions, such as parameter expansion or
quote removal.)
STDIN
The standard input shall be a text file used only when the file operand is specified as
'−'.
INPUT FILES
Any SCCS files processed shall be files of an unspecified format.
ENVIRONMENT VARIABLES
The following environment variables shall affect the execution of val:
LANG Provide a default value for the internationalization variables that are unset or
null. (See the Base Definitions volume of POSIX.1‐2008, Section 8.2,
Internationalization Variables for the precedence of internationalization
variables used to determine the values of locale categories.)
LC_ALL If set to a non-empty string value, override the values of all the other
internationalization variables.
LC_CTYPE Determine the locale for the interpretation of sequences of bytes of text data
as characters (for example, single-byte as opposed to multi-byte characters in
arguments and input files).
LC_MESSAGES
Determine the locale that should be used to affect the format and contents of
diagnostic messages written to standard error, and informative messages written
to standard output.
NLSPATH Determine the location of message catalogs for the processing of LC_MESSAGES.
ASYNCHRONOUS EVENTS
Default.
STDOUT
The standard output shall consist of informative messages about either:
1. Each file processed
2. Each command line read from standard input
If the standard input is not used, for each file operand yielding a discrepancy, the
output line shall have the following format:
"%s: %s\n", <pathname>, <unspecified string>
If the standard input is used, for each input line yielding a discrepancy, the output
shall have the following format:
"%s\n\n %s: %s\n", <input>, <pathname>, <unspecified string>
where <input> is the input line minus its terminating <newline>.
STDERR
Not used.
OUTPUT FILES
None.
EXTENDED DESCRIPTION
None.
EXIT STATUS
The 8-bit code returned by val shall be a disjunction of the possible errors; that is, it
can be interpreted as a bit string where set bits are interpreted as follows:
0x80 = Missing file argument.
0x40 = Unknown or duplicate option.
0x20 = Corrupted SCCS file.
0x10 = Cannot open file or file not SCCS.
0x08 = SID is invalid or ambiguous.
0x04 = SID does not exist.
0x02 = %Y%, −y mismatch.
0x01 = %M%, −m mismatch.
Note that val can process two or more files on a given command line and can process
multiple command lines (when reading the standard input). In these cases an aggregate code
shall be returned: a logical OR of the codes generated for each command line and file
processed.
CONSEQUENCES OF ERRORS
Default.
The following sections are informative.
APPLICATION USAGE
Since the val exit status sets the 0x80 bit, shell applications checking "$?" cannot tell
if it terminated due to a missing file argument or receipt of a signal.
EXAMPLES
In a directory with three SCCS files—s.x (of t type ``text''), s.y, and s.z (a corrupted
file)—the following command could produce the output shown:
val − <<EOF
−y source s.x
−m y s.y
s.z
EOF
−y source s.x
s.x: %Y%, −y mismatch
s.z
s.z: corrupted SCCS file
RATIONALE
None.
FUTURE DIRECTIONS
None.
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