ffi: zarray type for null terminated array support.

A zarray is null terminated when we convert from Lisp
to C representation. The last element of the Lisp vector
is ignored and all zero bits are written to the destination
buffer in the size of the element.

* ffi.c (zarray_s): New symbol variable.
(struct txr_ffi_type): New bitfield member, null_term.
(ffi_array_in): If the array's null_term flag is set,
then don't process the last element, since the corresponding
put call wasn't done for that element in ffi_array_put.
(ffi_array_put): If the array's null_term flag is set,
then when processing the last element, just memset the
output element to zero and don't call put.
(ffi_type_compile): Recognize zarray_s and set up the
flag accordingly.
(ffi_init): Initialize zarray_s.

* ffi.h (zarray_s): Declared.

1 files changed, 1 insertions, 1 deletions

diff --git a/ffi.h b/ffi.h
index 1aca9f19..6134c5fc 100644
--- a/ffi.h
+++ b/ffi.h
@@ -43,7 +43,7 @@ extern val buf_d_s;
 
 extern val ptr_in_s, ptr_out_s, ptr_in_d_s, ptr_out_d_s, ptr_s;
 
-extern val array_s;
+extern val array_s, zarray_s;
 
 extern val void_s;