Re: postgres.h MACRO issues

David Busby <busby(at)pnts(dot)com> writes:
> // Put my 32 bytes into the buffer, this works perfect
> memcpy(VARDATA(out_text), pbuf, 32);
> // Tell it the buffer size
> // I don't like that I've got to add the header size myself
> // could/should VARATT_SIZEP handle that for me?
> VARATT_SIZEP(out_text) = VARHDRSZ + 32;

VARATT_SIZEP can't be changed without breaking lots of extant code.
However, there's nothing stopping you from defining your own
convenience macro, along the lines of

#define SET_CHAR_LEN(ptr, len) (VARATT_SIZEP(ptr) = (len) + VARHDRSZ)

regards, tom lane