Re: I have some problem "Segmentation fault (core dumped)"

[Tim Van Holder]

Jordán E. Moisés wrote:

> Hi!
>
> Before anything, I excuse for my English
>
> I'm reading an O'REILLY's book named "lex & yacc", I'm trying to follow
> exercise by exercise, but I have stuck because one of then shows me
> "Segmentation fault (core dumped)" while I'm executing it, I don't know
> why?, and I can't be able to discover the problem.

That's why debuggers exist - running your program under gdb should have
pinpointed the exact place where a bad pointer is used.

> I attach the 3 files of the exercise [ch1-05.l, ch1-05.y and
> ch1-05y(original).h, of course the real name is "ch1-05y.h"] and 2 c source
> files an 1 header file generated by flex and byacc [ch1-05l.c, ch1-05y.c and

Also, if you use byacc, don't ask for help on the bison list ^^

> ch1-05y(after-mv).h about its name the same as before] (I'm working in my
> Windows 98 SE with cygwin).

In the lex file, you use the uninitialized pointer (word_list).
Try setting that to 0 before using it (and you may want to initialize
'state' as well - at the moment it will contain a random value which
might happen to be LOOKUP).