Using Lex (and Yacc) on a string.

[Chris Torek]

In article <25996 at mimsy.umd.edu> I suggested:
>#define unput(c) (mystring--)

(and then eventually)

>#define unput(c) ((c) ? mystr-- : 0)

The first of these will fail because lex uses unput as

	unput(*--yylastch)

and

	unput(*yylastch--)

Thanks to Brad White for noticing this error.  The first one should
be `#define unput(c) ((c), mystring--)'.

(This is what I get for making changes to lex things based on theoretical
arguments without checking to see whether lex uses good programming
practises :-) .)
-- 
In-Real-Life: Chris Torek, Univ of MD Comp Sci Dept (+1 301 454 7163)
Domain:	chris at cs.umd.edu	Path:	uunet!mimsy!chris
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