Re: Trouble with yytext

[David Durham]

Yes, in my uses of flex/bison, I always strdup(yytext) within flex when 
I'll be needing the text (as in IDENTs) and use that from then on... You 
just have to rememer to free strdup's returned pointer at some time


Hans Aberg wrote:

> At 01:36 -0800 2001/12/06, ROLAND wrote:
>
> > I am using FLEX and BISON to parse input given by the
> > user.
> > The input-line is picked up by FLEX correctly, since
> > it gives som printf-statements of yytext.
> > When yytext is processed by BISON on the other hand,
> > yytext appears to be an empty string.
> > Can someone tell me if there is something wrong in my
> > code?
>
> Flex does not return a string but a pointer to a buffer of a temporarily
> '\0' terminated string.
>
> So if you do not save the string in the buffer pointed at, after the next
> Flex call, it will not exist anymore (and Flex may change the buffer).
>
> Since you do not explain or give any explanatory code example, it is hard
> to guess more than that.
>
>  Hans Aberg
>
>
>
> _______________________________________________
> Help-bison mailing list
> address@hidden
> http://mail.gnu.org/mailman/listinfo/help-bison