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1991-04-15
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Page 1
CSP
Preprocessor for SALT Scripts
WHAT IS CSP?
CSP (CS Preprocessor) uses the Microsoft C or QuickC compiler as a
Telix SALT preprocessor, giving the SALT compiler conditional compile,
include file, and macro capabilities.
CSP requires Microsoft's QCL.EXE or CL.EXE in one of the directories
in your PATH.
WHAT DOES IT DO?
Not a whole lot. It runs a script file (for example FOO.SLT) through
the Microsoft C compiler (either QCL or CL) with the /P switch to
create an intermediate file. The intermediate file is lightly edited,
then given to the SALT compiler (CS.EXE). Line references in CS error
messages are changed from the file and line of the intermediate file
to the original file and line number.
FILES INCLUDED:
CSP.EXE SALT "preprocessor".
CSP.DOC This file.
CSP.WP5 WordPerfect 5.1 version of this file.
HOW DO I USE IT?
The simple syntax is:
CSP sourcefile [outputfile]
Which will preprocess and compile a SALT source file. SOURCEFILE is
the name of the script source file. If no extension is given CSP will
look for the file with the extension CSP, then SLT.
OUTPUTFILE is the filename (with no extension) CSP is to use when
creating output files. If an extension is given it is ignored. If no
output name is given then all files are named after the source file.
The full syntax is:
CSP [-Q"CMD"] [-PC] [-D MACRO=VALUE]... [-I DIR] [-b]
[-sstack] sourcefile [outputfile]
switches (which may begin with either '-' or '/') are:
Page 2
-Q Use CMD as preprocessor.
-P Preprocess only, do not compile. Creates a .SLI file.
-C Tell C preprocessor not to strip comments.
-D Tell C preprocessor to define MACRO as VALUE.
-I Tell C preprocessor to search DIRECTORY for include files.
-l Compile a C-preprocessed SALT file.
-b Compress runs of blank lines to one blank line.
-e Send C preprocessor error output to standard output.
-s Sets the stack size used by the SALT compiler.
EXPLANATIONS OF OPTIONS:
-Q Use CMD as preprocessor.
CSP usually uses either QCL or CL as the C preprocessor. If you have
another C compiler that can produce compatible preprocessed output /Q
will force CSP to use it. If the command requires switches the whole
command string must be quoted. For instance if you want CSP to use CL
instead of QCL (which it would do anyway if it didn't find QCL but I
can't think of a better example) use:
CSP -Q"CL /P" FOO.SLT
-P Preprocess only, do not compile. Creates a .SLI file.
CSP will send the file through the C preprocessor and create a CS-
compilable SLI file, but will not compile it.
-C Tell C preprocessor not to strip comments.
This passes the "/C" switch to the C preprocessor which tells it not
to strip comments from the source file.
-D Tell C preprocessor to define MACRO as VALUE.
Each -DMACRO=VALUE used passes a "/DMACRO=VALUE" to the C preprocessor
to define a macro.
-l Compile a C-preprocessed SALT file.
If you have another C compiler that produces Microsoft-compatible
preprocessor output, you can preprocess the script first then use CSP
with the -l switch on the output file. It will not preprocess the
file, but will compile it with CS and change line references in CS
error messages.
Page 3
-b Compress runs of blank lines to one blank line.
Usually the C preprocessor replaces lines containing preprocessor
directives and "switched off" code with blank lines. This option
replaces multiple blank lines with one blank line, resulting in a more
presentable SLI file.
-e Send C preprocessor error output to standard output.
This will force the C preprocessor to send all it's messages to the
standard output, allowing it to be redirected with '>', '>>', and '|'.
-s Sets the stack size used by the SALT compiler.
This option is passed to the SALT compiler to set the stack size of
the compiled SLC file.
Since you have to have a C compiler to use this I'm assuming you are
either already familiar with the C preprocessor directives or have
them documented elsewhere, and they won't be described here.
Obviously they work here just as they do in C, since the C compiler is
doing the preprocessing. Some notes:
There are a few preprocessor directives that QCL does not remove
(#pragma for instance), and these are stripped by CSP before the SALT
compile.
CSP will complain about code like this:
#define FOUR 2+2
int x=FOUR;
Because neither the C preprocessor nor CS replaces "2+2" with "4", so
the second line actually evalutes to:
int x=2+2;
and the SALT compiler only allows variable declarations to initialize
a variable to a constant, not an expression. If you can't reduce the
macro to a constant then the the variable must be declared and
intialized separately:
#define FOUR 2+2
int x;
x=FOUR;
Page 4
Because the C preprocessor strips comments by default, SALT scripts
that are preprocessed with CSP can contain C-style "/* */" comments,
as long as the -C switch is not used.
DISCLAIMER:
CSP is provided on an "as is" basis without warranty of any kind,
expressed or implied, including but not limited to the implied
warranties of merchantability and fitness for a particular purpose.
The person using the software bears all risk as to the quality and
performance of the software. Should the software prove defective, the
user assumes the entire cost of all necessary repair, servicing, or
correction. The author will not be liable for any special,
incidental, consequential, indirect or similar damages due to loss of
data or any other reason, even if the author or an agent of the author
has been advised of the possibility of such damages. In no event
shall the author's liability for any damages ever exceed the price
paid for the license to use the software, regardless of the form of
the claim.
REVISION HISTORY:
Version 1.01, April 15:
Added search for files with CSP and SLT extensions.
Filenames and line numbers in CS "warning" messages were not
being changed to the original file and line number. Fixed.
Version 1.00, March 16, 1991: Initial release.
ANYTHING ELSE?
There is no charge for private, non-commercial use of CSP (but if you
send a check anyway it won't go uncashed). If you use CSP in the
development of scripts which are sold to others, a $10 registration is
required. Comments, suggestions, and requests can be left at:
The Dead of Night BBS
(703) 644-7667
or mailed to:
Donald Mehrtens
5923 Minuteman Rd
Springfield VA 22152
or sent via CompuServe (which I don't check very often) to ID
72361,1407.
Page 5
SALT Programmers, HELP!
Is there any way for a script to determine its own name, as DOS ba