cid.l

gistfile1.c

%option noyywrap
D [0-9]
L [A-Za-z_]
%start COMMENT
%{
int depth = 0;
%}
%%
ifdef
ifndef
define
undef
include
extern
class
static
if
then
else
while
do
for
return
<INITIAL>"/*"    {depth=1;BEGIN(COMMENT);}
<COMMENT>"/*"    {depth++;}
<COMMENT>"*/"    {depth--;
                  if(!depth) 
                    BEGIN(INITIAL);
                 }
<COMMENT>.       {}
<INITIAL>{L}({D}|{L})*    { return 1; }
.
\n
%%