Re: how to free yylval

[Hans Aberg]

On 7 Jan 2008, at 07:20, cwhite wrote:

> I use
>
> yylval.string_type = strdup(yytext);
>
> in my flex file but it seems that this is wasteful and it may cause  
> memory
> leaks. I thought that yytext gets replaced everytime the lexer is  
> called so
> how is this wasteful? How do I free yylval so that those don't happen?
> Perhaps there is an alternative to strdup, I'd like to know what  
> that is.

See 'man strdup'; memory must be freed using 'free'. Done say in the  
actions, or using %destructor to do it during error recovers (see  
Bison manual).

  Hans Aberg