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From: goers@julius.cs.umn.edu
Newsgroups: comp.sys.mac.programmer
Subject: ?Bug? in LsC Preprocessor.
Keywords: LsC, C, Preprocessor
Message-ID: <11796@umn-cs.CS.UMN.EDU>
Date: 27 Mar 89 23:25:13 GMT
Sender: news@umn-cs.CS.UMN.EDU
Reply-To: goers@umn-cs.cs.umn.edu (Kenny Goers)
Distribution: usa
Organization: University of Minnesota, Minneapolis, CSci Dept.
Lines: 46
References:

Ho Netland,

I'm having a problem with a macro in LsC.  The following macro is preprocessed
"correctly" with the Sun and Sequent C preprocessors but in LsC I get
just a syntax error.  

#define check_size(name) \
	if (e_/**/name >= l_/**/name) { \
	    register nsize = l_/**/name-s_/**/name+400; \
	    name/**/buf = (char *) realloc(name/**/buf, nsize); \
	    e_/**/name = name/**/buf + (e_/**/name-s_/**/name) + 1; \
	    l_/**/name = name/**/buf + nsize - 5; \
	    s_/**/name = name/**/buf + 1; \
	}

I have tried to find any referances to whether this is
valid for a standard preprocessor but K&R don't get very specific about legal
substitution just say not in double quotes.  Could anyone on the net tell me 
what could be happening here?  Included are below are the unpreprocessed 
version, and the version after going through the preprocessor on a Sun system 
(I added indentation to it to make it readable, otherwise it just sat on one 
line).

Thanks for any help you can give.

Kenny Goers
goers@umn-cs.cs.umn.edu


/* Before Preprocess */
main()
{
	check_size(code);
}
---
/* After Preprocess on Sun 3.5 system */
main()
{
	if (e_code >= l_code) { 
		register nsize = l_code-s_code+400; 
		codebuf = (char *) realloc(codebuf, nsize); 
		e_code = codebuf + (e_code-s_code) + 1; 
		l_code = codebuf + nsize - 5; 
		s_code = codebuf + 1; 
	};
}