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/*-
* Copyright (c) 2023 The FreeBSD Foundation
*
* This software was 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 <sys/cdefs.h>
#include <atf-c.h>
#include <dlfcn.h>
#include <string.h>
int (*volatile strcmp_fn)(const char *, const char *);
ATF_TC(strcmp_alignments);
ATF_TC_HEAD(strcmp_alignments, tc)
{
atf_tc_set_md_var(tc, "descr", "Test strcmp(3) with various alignments");
}
static void
alignment_testcase(char *a, char *b, int want)
{
int res;
res = strcmp_fn(a, b);
ATF_CHECK_MSG(want == (res > 0) - (res < 0),
"strcmp(%p \"%s\", %p \"%s\") = %d != %d",
(void *)a, a, (void *)b, b, res, want);
}
static void
check_strcmp_alignments(char a[], char b[],
size_t a_off, size_t b_off, size_t len, size_t pos)
{
char *a_str, *b_str, a_orig, b_orig;
a[a_off] = '\0';
b[b_off] = '\0';
a_str = a + a_off + 1;
b_str = b + b_off + 1;
a_str[len] = '\0';
b_str[len] = '\0';
a_str[len+1] = 'A';
b_str[len+1] = 'B';
a_orig = a_str[pos];
b_orig = b_str[pos];
alignment_testcase(a_str, b_str, 0);
if (pos < len) {
a_str[pos] = '\0';
alignment_testcase(a_str, b_str, -1);
a_str[pos] = a_orig;
b_str[pos] = '\0';
alignment_testcase(a_str, b_str, 1);
b_str[pos] = b_orig;
}
a_str[pos] = 'X';
alignment_testcase(a_str, b_str, 1);
a_str[pos] = a_orig;
b_str[pos] = 'X';
alignment_testcase(a_str, b_str, -1);
b_str[pos] = b_orig;
a[a_off] = '-';
b[b_off] = '-';
a_str[len] = '-';
b_str[len] = '-';
a_str[len+1] = '-';
b_str[len+1] = '-';
}
ATF_TC_BODY(strcmp_alignments, tc)
{
size_t a_off, b_off, len, pos;
/* 16B alignment offset + 64B buffer + sentinel before/after + NUL */
char a[64+16+3], b[64+16+3];
memset(a, '-', sizeof(a));
memset(b, '-', sizeof(b));
a[sizeof(a) - 1] = '\0';
b[sizeof(b) - 1] = '\0';
/* check alignment offsets relevant for SSE routines */
for (a_off = 0; a_off < 16; a_off++)
for (b_off = 0; b_off < 16; b_off++)
/* ensure main loop (@ 32B) is completed at least once */
for (len = 1; len <= 64; len++)
for (pos = 0; pos <= len; pos++)
check_strcmp_alignments(a, b, a_off, b_off, len, pos);
}
ATF_TP_ADD_TCS(tp)
{
void *dl_handle;
dl_handle = dlopen(NULL, RTLD_LAZY);
strcmp_fn = dlsym(dl_handle, "test_strcmp");
if (strcmp_fn == NULL)
strcmp_fn = strcmp;
ATF_TP_ADD_TC(tp, strcmp_alignments);
return atf_no_error();
}
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