[Caml-list] camlidl - character arrays?

[Caml-list] camlidl - character arrays?

[Brian Naylor]

I am trying to use CamlIDL for a C function like the following:

    int foo (unsigned char [16]);

If I write my CamlIDL file like this:

    int foo ([in,string] unsigned char s [16]);

The code does a check like this:

    if (string_length(_v_s) >= 16) invalid argument("foo");

The problem is that this is NOT a null-terminated string - it is exactly 16
bytes of data.

Is there a way to write the CamlIDL file for this function?  Thanks.


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Re: [Caml-list] camlidl - character arrays?

[Dmitry Bely]

Brian Naylor <bwv211mail@yahoo.com> writes:

> I am trying to use CamlIDL for a C function like the following:
>
>     int foo (unsigned char [16]);
>
> If I write my CamlIDL file like this:
>
>     int foo ([in,string] unsigned char s [16]);
>
> The code does a check like this:
>
>     if (string_length(_v_s) >= 16) invalid argument("foo");
>
> The problem is that this is NOT a null-terminated string - it is exactly 16
> bytes of data.

You have two options here:

1. Don't use "string" attribute and pass OCaml character array (not string)
to your function or
2. Declare it as
     int foo ([string] unsigned char s[17]);
As C arrays are passed by the pointer, your C function will never know that
the trailing '\0' is there.

Dmitry Bely


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