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-rw-r--r--lib/libc/tests/string/memcmp_test.c160
1 files changed, 160 insertions, 0 deletions
diff --git a/lib/libc/tests/string/memcmp_test.c b/lib/libc/tests/string/memcmp_test.c
new file mode 100644
index 000000000000..fa2f498ccfaf
--- /dev/null
+++ b/lib/libc/tests/string/memcmp_test.c
@@ -0,0 +1,160 @@
+/*-
+ * Copyright (c) 2016 Jilles Tjoelker <jilles@FreeBSD.org>
+ * Copyright (c) 2023 The FreeBSD Foundation
+ * All rights reserved.
+ *
+ * Portions of this software were developed by Robert Clausecker
+ * <fuz@FreeBSD.org> under sponsorship from the FreeBSD Foundation.
+ *
+ * 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 <assert.h>
+#include <dlfcn.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <atf-c.h>
+
+#ifndef MEMCMP
+#define MEMCMP memcmp
+#endif
+
+/*
+ * On FreeBSD we previously demanded that memcmp returns the difference
+ * between the characters at the first site of mismatch. However,
+ * ISO/IEC 9899:1990 only specifies that a number greater than, equal
+ * to, or less than zero shall be returned. If a unit test for the
+ * more strict behaviour is desired, define RES(x) to be (x).
+ */
+#ifndef RES
+#define RES(x) (((x) > 0) - ((x) < 0))
+#endif
+
+static int (*memcmp_fn)(const void *, const void *, size_t);
+
+static void
+check_memcmp(const char *a, const char *b, size_t len, int expected)
+{
+ int got;
+
+ got = memcmp_fn(a, b, len);
+ ATF_CHECK_EQ_MSG(RES(expected), RES(got),
+ "%s(%p, %p, %zu) gave %d, but wanted %d",
+ __XSTRING(MEMCMP), a, b, len, got, expected);
+}
+
+ATF_TC_WITHOUT_HEAD(zero);
+ATF_TC_BODY(zero, tc)
+{
+
+ check_memcmp("a", "b", 0, 0);
+ check_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++)
+ check_memcmp(data1, data2, i, 0);
+ for (i = 1; i < 256; i++)
+ check_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++)
+ check_memcmp(data1, data2, i, -0x55);
+ for (i = 1; i < 256; i++)
+ check_memcmp(data1 + i, data2 + i, 256 - i, i - (i ^ 0x55));
+}
+
+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++) {
+ check_memcmp(data1 + 128, data2 + 128, i, 255);
+ check_memcmp(data2 + 128, data1 + 128, i, -255);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i, 255);
+ check_memcmp(data2 + 129 - i, data1 + 129 - i, i, -255);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, 255);
+ check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, -255);
+ }
+ data1[128] = 'c';
+ data2[128] = 'e';
+ for (i = 1; i < 66; i++) {
+ check_memcmp(data1 + 128, data2 + 128, i, -2);
+ check_memcmp(data2 + 128, data1 + 128, i, 2);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
+ check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
+ check_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++) {
+ check_memcmp(data1 + 128, data2 + 128, i, -2);
+ check_memcmp(data2 + 128, data1 + 128, i, 2);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i, -2);
+ check_memcmp(data2 + 129 - i, data1 + 129 - i, i, 2);
+ check_memcmp(data1 + 129 - i, data2 + 129 - i, i * 2, -2);
+ check_memcmp(data2 + 129 - i, data1 + 129 - i, i * 2, 2);
+ }
+}
+
+ATF_TP_ADD_TCS(tp)
+{
+ void *dl_handle;
+
+ dl_handle = dlopen(NULL, RTLD_LAZY);
+ memcmp_fn = dlsym(dl_handle, "test_" __XSTRING(MEMCMP));
+ if (memcmp_fn == NULL)
+ memcmp_fn = MEMCMP;
+
+ 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());
+}