Add faster decimal digit counting function

1 files changed, 55 insertions, 0 deletions

diff --git a/tests/decimal_test.c b/tests/decimal_test.c
new file mode 100644
index 00000000..b0361e2c
--- /dev/null
+++ b/tests/decimal_test.c
@@ -0,0 +1,55 @@
+/*
+  Copyright 2011-2019 David Robillard <http://drobilla.net>
+
+  Permission to use, copy, modify, and/or distribute this software for any
+  purpose with or without fee is hereby granted, provided that the above
+  copyright notice and this permission notice appear in all copies.
+
+  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+*/
+
+#undef NDEBUG
+
+#include "../src/decimal.h"
+
+#include <assert.h>
+
+static void
+test_count_digits(void)
+{
+	assert(1 == serd_count_digits(0));
+	assert(1 == serd_count_digits(1));
+	assert(1 == serd_count_digits(9));
+	assert(2 == serd_count_digits(10));
+	assert(2 == serd_count_digits(99ull));
+	assert(3 == serd_count_digits(999ull));
+	assert(4 == serd_count_digits(9999ull));
+	assert(5 == serd_count_digits(99999ull));
+	assert(6 == serd_count_digits(999999ull));
+	assert(7 == serd_count_digits(9999999ull));
+	assert(8 == serd_count_digits(99999999ull));
+	assert(9 == serd_count_digits(999999999ull));
+	assert(10 == serd_count_digits(9999999999ull));
+	assert(11 == serd_count_digits(99999999999ull));
+	assert(12 == serd_count_digits(999999999999ull));
+	assert(13 == serd_count_digits(9999999999999ull));
+	assert(14 == serd_count_digits(99999999999999ull));
+	assert(15 == serd_count_digits(999999999999999ull));
+	assert(16 == serd_count_digits(9999999999999999ull));
+	assert(17 == serd_count_digits(99999999999999999ull));
+	assert(18 == serd_count_digits(999999999999999999ull));
+	assert(19 == serd_count_digits(9999999999999999999ull));
+	assert(20 == serd_count_digits(18446744073709551615ull));
+}
+
+int
+main(void)
+{
+	test_count_digits();
+}