%option stack noyywrap

%{
#include <stdio.h>
%}

%x str
%x ccmt
%x cxxcmt

%%
\"        { putchar ('"'); yy_push_state (str); }
<str>{
\\\"      fputs (yytext, stdout);
\"        { putchar ('"'); yy_pop_state (); }
.         fputs (yytext, stdout);
}

"/*"      { fputs (yytext, stdout); yy_push_state (ccmt); }
<ccmt>{
"*/"      { fputs ("*/", stdout); yy_pop_state (); }
.         fputs (yytext, stdout);
}

"//"      { fputs ("/*", stdout); yy_push_state (cxxcmt); }
<cxxcmt>{
\n        { puts (" */"); yy_pop_state (); }
.         fputs (yytext, stdout);
}

.         fputs (yytext, stdout);
%%

int
main (void)
{
    yyin = stdin;
    yylex ();
    return 0;
}