duktape/api-testcases/test-to-fixed-buffer.c

/*===
*** test_1 (duk_safe_call)
16 bytes: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
16 bytes: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
16 bytes: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
final top: 1
==> rc=0, result='undefined'
*** test_2 (duk_safe_call)
16 bytes: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
16 bytes: 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 2
final top: 1
==> rc=0, result='undefined'
*** test_3 (duk_safe_call)
==> rc=1, result='TypeError: incorrect type, expected tag 7'
*** test_4 (duk_safe_call)
==> rc=1, result='Error: invalid index: 3'
*** test_5 (duk_safe_call)
==> rc=1, result='Error: invalid index: -2147483648'
===*/

void dump_buffer(duk_context *ctx) {
	unsigned char *p;
	size_t i, s;

	p = (unsigned char *) duk_require_buffer(ctx, -1, &s);
	printf("%d bytes:", (int) s);
	for (i = 0; i < s; i++) {
		printf(" %d", (int) p[i]);
	}
	printf("\n");
}

/* dynamic buffer */
int test_1(duk_context *ctx) {
	unsigned char *p;

	duk_set_top(ctx, 0);

	p = (unsigned char *) duk_push_dynamic_buffer(ctx, 16);
	p[0] = 1;
	p[15] = 2;
	dump_buffer(ctx);

	duk_to_fixed_buffer(ctx, -1);
	dump_buffer(ctx);

	/* second time should be a no-op */
	duk_to_fixed_buffer(ctx, -1);
	dump_buffer(ctx);

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

/* fixed buffer */
int test_2(duk_context *ctx) {
	unsigned char *p;

	duk_set_top(ctx, 0);

	p = (unsigned char *) duk_push_fixed_buffer(ctx, 16);
	p[0] = 1;
	p[15] = 2;
	dump_buffer(ctx);

	duk_to_fixed_buffer(ctx, -1);
	dump_buffer(ctx);

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

/* non-buffer */
int test_3(duk_context *ctx) {
	duk_set_top(ctx, 0);
	duk_push_string(ctx, "foo");

	duk_to_fixed_buffer(ctx, -1);

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

/* invalid index */
int test_4(duk_context *ctx) {
	duk_set_top(ctx, 0);

	duk_to_fixed_buffer(ctx, 3);

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

/* DUK_INVALID_INDEX */
int test_5(duk_context *ctx) {
	duk_set_top(ctx, 0);

	duk_to_fixed_buffer(ctx, DUK_INVALID_INDEX);

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

void test(duk_context *ctx) {
	TEST_SAFE_CALL(test_1);
	TEST_SAFE_CALL(test_2);
	TEST_SAFE_CALL(test_3);
	TEST_SAFE_CALL(test_4);
	TEST_SAFE_CALL(test_5);  /* FIXME: exposes DUK_INVALID_INDEX number constant */
}