Maarten Boekhold wrote:
>On Tue, 4 Aug 1998, Oliver Elphick wrote:
>
>> Can you tell me, please, how to construct a varlena (to be returned by
>> a function).
>>
>> I see it is declared as an int and a 1-byte array; I don't know how to
>> assign a longer string in place of that 1-byte array; the compiler
>> complains about incompatible types, whatever I do.
>
>If I'm correct:
>
> malloc(sizeof(VARLENA) + l);
>
>where 'l' is the length of the string you want to put in (without the
>trailing '\0').
Thanks for your reply; I've been away a few days so I've only just seen it.
My problem is in how to get the compiler to treat the malloced space as
a varlena.
I have this (abridged) C code, to be used with
CREATE FUNCTION cname(bpchar, bpchar, bpchar) returns bpchar ...:
char *cxname;
text cname (text s, text t, text f)
{
text *result;
...
cxname = realloc((void *) cxname, strlen(tmp)+sizeof(struct varlena));
strcpy(cxname+sizeof(int32), tmp);
-> result = &((struct varlena) cxname);
result->vl_len = strlen(tmp);
return *result;
}
but the compiler gives the error `conversion to non-scalar type requested'
at the marked line.
Once I know how to do this, I will add it to the examples in the CREATE
FUNCTION documentation, since it will no doubt be helpful to others.
--
Oliver Elphick Oliver.Elphick@lfix.co.uk
Isle of Wight http://www.lfix.co.uk/oliver
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