ffi: functions and macros for basic type properties.

* ffi.c (ffi_alignof, ffi_offsetof, ffi_arraysize,
ffi_elemsize, ffi_elemtype): New functions.
(ffi_init): Registered intrinsics ffi-alignof, ffi-offsetof,
ffi-arraysize, ffi-elemsize, ffi-elemtype.

* ffi.h (ffi_alignof, ffi_offsetof, ffi_arraysize,
ffi_elemsize, ffi_elemtype): Declared.

* lisplib.c (ffi_set_entries): New autoload entries alignof,
offsetof, arraysize, elemsize, elemtype.

* share/txr/stdlib/ffi.tl (alignof, offsetof, arraysize,
elemsize, elemtype): New macros.

* txr.1: Documented new functions and macros.

1 files changed, 5 insertions, 0 deletions

diff --git a/ffi.h b/ffi.h
index 9f7876ef..c8f6021b 100644
--- a/ffi.h
+++ b/ffi.h
@@ -64,6 +64,11 @@ mem_t *ffi_closure_get_fptr(val closure);
 val ffi_call_wrap(val fptr, val ffi_call_desc, struct args *args);
 val ffi_typedef(val name, val type);
 val ffi_size(val type);
+val ffi_alignof(val type);
+val ffi_offsetof(val type, val memb);
+val ffi_arraysize(val type);
+val ffi_elemsize(val type);
+val ffi_elemtype(val type);
 val ffi_put_into(val dstbuf, val obj, val type);
 val ffi_put(val obj, val type);
 val ffi_in(val srcbuf, val obj, val type, val copy_p);