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* buf.c (make_duplicate_buf, buf_get, buf_fill): New
functions.
* buf.h (make_duplicate_buf, buf_get, buf_fill): Declared.
* ffi.c (struct txr_ffi_type): New member, nelem.
Keeps track of number of elements, for types that are
FFI pointers. This lets us support the get method so that
a buf can be a C function return value, if its size is
declared in our FFI type system.
(ffi_buf_put, ffi_buf_get, ffi_buf_fill): New functions.
(ffi_type_compile): Handle two new cases of syntax for
buffers: (buf <size>) and buf.
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* buf.c (buf_put_float, buf_put_cptr, buf_get_float,
buf_get_cptr, align_float, align_cptr, size_float, size_cptr):
New functions.
(buf_init): Registered intrinsics buf-put-float, buf-put-cptr,
buf-get-float, buf-get-cptr, align-float, align-cptr,
size-float, size_cptr.
* buf.h (buf_put_float, buf_put_cptr, buf_get_float,
buf_get_cptr, align_float, align_cptr, size_float, size_cptr):
Declared.
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* Makefile (OBJS): New objects itypes.o and buf.o.
* buf.c, buf.h: New files.
* itypes.c, itypes.h: New files.
* lib.c (obj_print_impl): Handle BUF via buf_print and
buf_pprint.
(init): Call itypes_init and buf_init.
* parser.h (end_of_buflit): Declared.
* parser.l (BUFLIT): New exclusive state.
(grammar): New rules for recognizing start of buffer
literal and its interior.
(end_of_buflit): New function.
* parser.y (HASH_B_QUOTE): New token.
(buflit, buflit_items, buflit_item): New nonterminals
and corresponding grammar rules.
(i_expr, n_expr): These symbols now generate a buflit;
a buffer literal is a kind of expression.
(yybadtoken): Handle HASH_B_QUOTE case.
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