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Add native-write, which will write structs to buffers.

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Useful for testing as well as useful in its own right. Begs
for an inverse, native-read which would convert byte data
to native structs.
This commit is contained in:
Calvin Rose 2022-06-10 08:46:20 -05:00
parent f1ec8d1e11
commit 1cc48a370a
1 changed files with 17 additions and 0 deletions
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17
src/core/ffi.c
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@ -641,11 +641,28 @@ JANET_CORE_FN(cfun_ffi_call,
}
}
JANET_CORE_FN(cfun_ffi_buffer_write,
"(native-write ffi-type data &opt buffer)",
"Append a native tyep to a buffer such as it would appear in memory. This can be used "
"to pass pointers to structs in the ffi, or send C/C++/native structs over the network "
"or to files. Returns a modifed buffer or a new buffer if one is not supplied.") {
janet_arity(argc, 2, 3);
JanetFFIType type = decode_ffi_type(argv[0]);
size_t el_size = type_size(type);
JanetBuffer *buffer = janet_optbuffer(argv, argc, 2, el_size);
janet_buffer_extra(buffer, el_size);
memset(buffer->data, 0, el_size);
janet_ffi_write_one(buffer->data, argv, 1, type);
buffer->count += el_size;
return janet_wrap_buffer(buffer);
}
void janet_lib_ffi(JanetTable *env) {
JanetRegExt ffi_cfuns[] = {
JANET_CORE_REG("native-signature", cfun_ffi_signature),
JANET_CORE_REG("native-call", cfun_ffi_call),
JANET_CORE_REG("native-struct", cfun_ffi_struct),
JANET_CORE_REG("native-write", cfun_ffi_buffer_write),
JANET_REG_END
};
janet_core_cfuns_ext(env, NULL, ffi_cfuns);