Is string-append broken?

Is string-append broken?

[Bruce Korb]

Why is this code "wrong"?

> (string-append (c-string (get "name")) ", ")

As an experiment, I did this:

 (define c-str (c-string (get "name")))
 (shellf "echo 'c-str is set to -->%s<--' >&2" c-str)
 (set!   c-str (string-append c-str ", "))
 (shellf "echo 'c-str is set to -->%s<--' >&2" c-str)

Here is the result:

autogen -T getopt.tpl getpwnam-opts.def
c-str is set to -->"name"<--
c-str is set to -->"name"<--
c-str is set to -->"passwd"<--
c-str is set to -->"passwd"<--
c-str is set to -->"uid"<--
c-str is set to -->"uid"<--
c-str is set to -->"gname"<--
c-str is set to -->"gname"<--

This works:

  (sprintf "%s, " (c-string (get "name")))

but should not be any different.....Am I confused or is this a bug?


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Re: string-append *IS* broken!!!

[Bruce Korb]

Who in heck told string-append it "okay" to not do its job if the
first string appeared to be quoted?  That is utterly disgusting
and completely counter-intuitive.  How can you do that?  That
function has absolutely *NO* business trying to understand the
contents of the strings I want to concatenate together.

Bruce Korb wrote:
> 
> Why is this code "wrong"?
> 
> > (string-append (c-string (get "name")) ", ")
> 
> As an experiment, I did this:
> 
>  (define c-str (c-string (get "name")))
>  (shellf "echo 'c-str is set to -->%s<--' >&2" c-str)
>  (set!   c-str (string-append c-str ", "))
>  (shellf "echo 'c-str is set to -->%s<--' >&2" c-str)
> 
> Here is the result:
> 
> autogen -T getopt.tpl getpwnam-opts.def
> c-str is set to -->"name"<--
> c-str is set to -->"name"<--
> c-str is set to -->"passwd"<--
> c-str is set to -->"passwd"<--
> c-str is set to -->"uid"<--
> c-str is set to -->"uid"<--
> c-str is set to -->"gname"<--
> c-str is set to -->"gname"<--
> 
> This works:
> 
>   (sprintf "%s, " (c-string (get "name")))
> 
> but should not be any different.....Am I confused or is this a bug?


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Re: string-append *IS* broken!!!

[Marius Vollmer]

Bruce Korb <bkorb@veritas.com> writes:

> Who in heck told string-append it "okay" to not do its job if the
> first string appeared to be quoted?  That is utterly disgusting
> and completely counter-intuitive.  How can you do that?  That
> function has absolutely *NO* business trying to understand the
> contents of the strings I want to concatenate together.

Heh, of course string-append doesn't do that.  This is no sh or Perl! ;-)

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Re: string-append is *NOT* broken!!!

[Bruce Korb]

Marius Vollmer wrote:

> Heh, of course string-append doesn't do that.  This is no sh or Perl! ;-)

No, of course not.  It was getting later than I thought and very tired out.
I hit a day one bug in my code that I knew couldn't be there ... I'd used
it too much.


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Re: Is string-append broken?

[Marius Vollmer]

Bruce Korb <bkorb@veritas.com> writes:

> Why is this code "wrong"?
>
>> (string-append (c-string (get "name")) ", ")

What does this expression evaluate to?  I.e., what is printed when you
type it it the "guile>" prompt?

I get, for example:

  guile> (define c-str "\"passwd\"")
  guile> c-str
  "\"passwd\""
  guile> (string-append c-str ", ")
  "\"passwd\", "
  guile>

which looks correct to me.  Maybe 'shellf' is to blame.

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