tutorial

[Pierre Ancelot]

Hi, i am following a little tutorial because of a software i wish to package 
for debian which has a few errors (see second post...) and in this tutorial, 
there is this : 
After having done all they told :

 * Usage: (1) $ flex sample1.lex
 *        (2) $ gcc lex.yy.c -lfl
 *        (3) $ ./a.out


I type "username" and i get (null)

 
address@hidden:~/flex$ ./a.out
username
(null)

address@hidden:~/flex$


Here is the code, anyone willing to tell what's wrong in this ?


%{
/* need this for the call to getlogin() below */
#include <unistd.h>
%}

%%
username printf("%s\n", getlogin());
%%

main()
{
  yylex();
}

pgpGBy4__4MyK.pgp
Description: PGP signature