diff options
Diffstat (limited to 'lib/libc/tests/string/memcmp_test.c')
-rw-r--r-- | lib/libc/tests/string/memcmp_test.c | 160 |
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()); +} |