duktape/tests/api/test-get-buffer.c

/*===
*** test_basic (duk_safe_call)
top: 18
index 0: length 0
index 1: length 0
index 2: length 0
index 3: length 0
index 4: length 0
index 5: length 0
index 6: length 0
index 7: length 0
index 8: length 0
index 9: length 1024, ptr-is-NULL 0
index 10: length 0
index 11: length 2048, ptr-is-NULL 0
index 12: length 0
index 13: length 0
index 14: length 0
index 15: length 0
index 16: length 0
index 17: length 0
final top: 18
==> rc=0, result='undefined'
===*/

static duk_ret_t test_basic(duk_context *ctx, void *udata) {
	duk_idx_t i, n;

	(void) udata;

	duk_push_undefined(ctx);
	duk_push_null(ctx);
	duk_push_true(ctx);
	duk_push_false(ctx);
	duk_push_string(ctx, "");
	duk_push_string(ctx, "foo");
	duk_push_int(ctx, 123);
	duk_push_object(ctx);
	duk_push_fixed_buffer(ctx, 0);
	duk_push_fixed_buffer(ctx, 1024);
	duk_push_dynamic_buffer(ctx, 0);
	duk_push_dynamic_buffer(ctx, 2048);
	duk_eval_string(ctx, "(function () { return new ArrayBuffer(16); })()");
	duk_eval_string(ctx, "(function () { return new Uint32Array(16); })()");
	duk_eval_string(ctx, "(function () { return new DataView(new ArrayBuffer(16)); })()");
	duk_eval_string(ctx, "(function () { return new Uint32Array(16).subarray(3, 6); })()");
	duk_eval_string(ctx, "(function () { return new Buffer('ABCDEFGH'); })()");
	duk_eval_string(ctx, "(function () { return new Buffer('ABCDEFGH').slice(3, 6); })()");

	n = duk_get_top(ctx);
	printf("top: %ld\n", (long) n);
	for (i = 0; i < n; i++) {
		void *buf;
		duk_size_t len;

		len = (duk_size_t) 0xdeadbeefUL;
		buf = duk_get_buffer(ctx, i, &len);
		if (len == 0) {
			/* avoid printing 'buf' if len is zero, as it is not predictable */
			printf("index %ld: length 0\n", (long) i);
		} else {
			printf("index %ld: length %lu, ptr-is-NULL %d\n",
			       (long) i, (unsigned long) len, (buf == NULL ? 1 : 0));
		}
	}

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

/*===
*** test_null_ptr (duk_safe_call)
p is not NULL
final top: 1
==> rc=0, result='undefined'
===*/

static duk_ret_t test_null_ptr(duk_context *ctx, void *udata) {
	void *p;

	(void) udata;

	duk_push_fixed_buffer(ctx, 1024);

	p = duk_get_buffer(ctx, -1, NULL);
	if (p) {
		printf("p is not NULL\n");
	} else {
		printf("p is NULL\n");
	}

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

/*===
*** test_invalid_index (duk_safe_call)
p is NULL
final top: 0
==> rc=0, result='undefined'
===*/

static duk_ret_t test_invalid_index(duk_context *ctx, void *udata) {
	void *p;
	duk_size_t sz;

	(void) udata;

	sz = (duk_size_t) 0xdeadbeefUL;
	p = duk_get_buffer(ctx, -1, &sz);
	if (p) {
		printf("p is not NULL, sz=%ld\n", (long) sz);
	} else {
		printf("p is NULL\n");
	}

	printf("final top: %ld\n", (long) duk_get_top(ctx));
	return 0;
}

/*===
*** test_buffer_object (duk_safe_call)
p is NULL
==> rc=0, result='undefined'
===*/

static duk_ret_t test_buffer_object(duk_context *ctx, void *udata) {
	void *p;
	duk_size_t sz;

	(void) udata;

	/* duk_get_buffer() doesn't accept a buffer object */

	duk_set_top(ctx, 0);
	duk_eval_string(ctx, "new ArrayBuffer(16)");
	sz = (duk_size_t) 0xdeadbeefUL;
	p = duk_get_buffer(ctx, -1, &sz);
	if (p) {
		printf("p is not NULL, sz=%ld\n", (long) sz);
	} else {
		printf("p is NULL\n");
	}

	return 0;
}

void test(duk_context *ctx) {
	TEST_SAFE_CALL(test_basic);
	TEST_SAFE_CALL(test_null_ptr);
	TEST_SAFE_CALL(test_invalid_index);
	TEST_SAFE_CALL(test_buffer_object);
}