You are using the `___U8VECTORLENGTH` macro and friends incorrectly. They return a fixnum but your `c-lambda`s return `size_t`… so you want to say `___INT(___U8VECTORLENGTH(___arg1))` which converts the fixnum to an `int`, or use `scheme-object` instead of `size_t` as the return type of the `c-lambda`s.
Thanks! I didn't notice the fixnum tagging.
How does one build lists in a c-lambda? This:
(pp ((c-lambda () scheme-object "___return(___CONS(___FIX(1), ___CONS(FIX(2), ___NUL)));")))
gives errors about:
/Users/lassi/.local/include/gambit.h:2459:30: error: '___hp' undeclared (first use in this function); did you mean '___fp'? 2459 | #define ___BEGIN_ALLOC_PAIR()___hp[0] = ___MAKE_HD_WORDS(___PAIR_SIZE,___sPAIR) | ^~~~~