libc: Add some tests for memcmp().

svn path=/head/; revision=296434

lib/libc/tests/string/Makefile

@@ -1,5 +1,6 @@
 # $FreeBSD$
 
+ATF_TESTS_C+=		memcmp_test
 ATF_TESTS_C+=		stpncpy_test
 ATF_TESTS_C+=		strerror2_test
 ATF_TESTS_C+=		wcscasecmp_test

lib/libc/tests/string/memcmp_test.c

@@ -0,0 +1,124 @@
+/*-
+ * Copyright (c) 2016 Jilles Tjoelker <jilles@FreeBSD.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <atf-c.h>
+
+ATF_TC_WITHOUT_HEAD(zero);
+ATF_TC_BODY(zero, tc)
+{
+
+	assert(memcmp("a", "b", 0) == 0);
+	assert(memcmp("", "", 0) == 0);
+}
+
+ATF_TC_WITHOUT_HEAD(eq);
+ATF_TC_BODY(eq, tc)
+{
+	unsigned char data1[256], data2[256];
+	int i;
+
+	for (i = 0; i < 256; i++)
+		data1[i] = data2[i] = i ^ 0x55;
+	for (i = 1; i < 256; i++)
+		assert(memcmp(data1, data2, i) == 0);
+	for (i = 1; i < 256; i++)
+		assert(memcmp(data1 + i, data2 + i, 256 - i) == 0);
+}
+
+ATF_TC_WITHOUT_HEAD(neq);
+ATF_TC_BODY(neq, tc)
+{
+	unsigned char data1[256], data2[256];
+	int i;
+
+	for (i = 0; i < 256; i++) {
+		data1[i] = i;
+		data2[i] = i ^ 0x55;
+	}
+	for (i = 1; i < 256; i++)
+		assert(memcmp(data1, data2, i) != 0);
+	for (i = 1; i < 256; i++)
+		assert(memcmp(data1 + i, data2 + i, 256 - i) != 0);
+}
+
+ATF_TC_WITHOUT_HEAD(diff);
+ATF_TC_BODY(diff, tc)
+{
+	unsigned char data1[256], data2[256];
+	int i;
+
+	memset(data1, 'a', sizeof(data1));
+	memset(data2, 'a', sizeof(data2));
+	data1[128] = 255;
+	data2[128] = 0;
+	for (i = 1; i < 66; i++) {
+		assert(memcmp(data1 + 128, data2 + 128, i) == 255);
+		assert(memcmp(data2 + 128, data1 + 128, i) == -255);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i) == 255);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i) == -255);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i * 2) == 255);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i * 2) == -255);
+	}
+	data1[128] = 'c';
+	data2[128] = 'e';
+	for (i = 1; i < 66; i++) {
+		assert(memcmp(data1 + 128, data2 + 128, i) == -2);
+		assert(memcmp(data2 + 128, data1 + 128, i) == 2);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i) == -2);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i) == 2);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i * 2) == -2);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i * 2) == 2);
+	}
+	memset(data1 + 129, 'A', sizeof(data1) - 129);
+	memset(data2 + 129, 'Z', sizeof(data2) - 129);
+	for (i = 1; i < 66; i++) {
+		assert(memcmp(data1 + 128, data2 + 128, i) == -2);
+		assert(memcmp(data2 + 128, data1 + 128, i) == 2);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i) == -2);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i) == 2);
+		assert(memcmp(data1 + 129 - i, data2 + 129 - i, i * 2) == -2);
+		assert(memcmp(data2 + 129 - i, data1 + 129 - i, i * 2) == 2);
+	}
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+
+	ATF_TP_ADD_TC(tp, zero);
+	ATF_TP_ADD_TC(tp, eq);
+	ATF_TP_ADD_TC(tp, neq);
+	ATF_TP_ADD_TC(tp, diff);
+
+	return (atf_no_error());
+}