Re: [9fans] plan9 lexer problem

Re: [9fans] plan9 lexer problem

[erik quanstrom]

> %{
> %}
>
> %%
> stop	print("Stop!! recieved\n");
> start	print("Start -> recieved\n");
> %%

the fix for this should be to add
#include <u.h>
#include <libc.h>

between %{ and %} but this doesn't work because
lex includes stdio.h before it processes %{ %}.
you'll need to write a shim, fixlex.c, that goes like this

#include <u.h>
#include <libc.h>
#include "lex.yy.c"

that is unless you want to dive into the lex source. :-)

- erik

Re: [9fans] plan9 lexer problem

[Prem Mallappa]

the manual for lex says ..
lex -9
should generate a Plan9 compatible code with u.h and libc.h included,
otherwise 8c and 8l will generate error searching for vsprintf(...)

/Prem


On Mon, Nov 10, 2008 at 4:54 PM, erik quanstrom <quanstro@quanstro.net> wrote:
>> %{
>> %}
>>
>> %%
>> stop  print("Stop!! recieved\n");
>> start print("Start -> recieved\n");
>> %%
>
> the fix for this should be to add
> #include <u.h>
> #include <libc.h>
>
> between %{ and %} but this doesn't work because
> lex includes stdio.h before it processes %{ %}.
> you'll need to write a shim, fixlex.c, that goes like this
>
> #include <u.h>
> #include <libc.h>
> #include "lex.yy.c"
>
> that is unless you want to dive into the lex source. :-)
>
> - erik
>

[9fans] plan9 lexer problem

[prem]

Hi,
I was trying to learn lex/yacc decided to use Plan9 (9vx) for writing
example programs. I wrote the following
--------start.l-----
%{
%}

%%
stop	print("Stop!! recieved\n");
start	print("Start -> recieved\n");
%%

-------------

I lex'ed it
-> lex -9 start.l
-> 8c lex.yy.c
-> 8l lex.yy.8
-> ./8.out
start
output: inappropriate use of fd
sd: /bin/sd file does not exists

(with small modifications i.e use of <stdio.h> and using printf, I am
able to compiler and run this). could someone help whats happening in
this case ..