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lib/libc/tests/string: add unit tests for strncmp(3)
These are patterned after the previously added (D41970) strcmp tests, but are extended to check for various length conditions. Sponsored by: The FreeBSD Foundation Tested by: developers@, exp-run Approved by: mjg MFC after: 1 month MFC to: stable/14 PR: 275785 Differential Revision: https://reviews.freebsd.org/D42122
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@ -11,6 +11,7 @@ ATF_TESTS_C+= flsl_test
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ATF_TESTS_C+= flsll_test
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ATF_TESTS_C+= memcmp_test
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ATF_TESTS_C+= memset_s_test
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ATF_TESTS_C+= strncmp_test
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ATF_TESTS_C+= stpncpy_test
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ATF_TESTS_C+= strcmp2_test
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ATF_TESTS_C+= strcspn_test
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165
lib/libc/tests/string/strncmp_test.c
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165
lib/libc/tests/string/strncmp_test.c
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@ -0,0 +1,165 @@
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/*-
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* Copyright (c) 2023 The FreeBSD Foundation
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*
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* This software was developed by Robert Clausecker <fuz@FreeBSD.org>
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* under sponsorship from the FreeBSD Foundation.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ''AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE
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*/
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#include <sys/cdefs.h>
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#include <atf-c.h>
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#include <dlfcn.h>
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#include <string.h>
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int (*volatile strncmp_fn)(const char *, const char *, size_t);
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static void
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alignment_testcase(char *a, char *b, int want, size_t len)
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{
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int res;
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res = strncmp_fn(a, b, len);
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ATF_CHECK_MSG(want == (res > 0) - (res < 0),
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"strcmp(%p \"%s\", %p \"%s\", %zu) = %d != %d",
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(void *)a, a, (void *)b, b, len, res, want);
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}
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static void
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check_strncmp_alignments(char a[], char b[],
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size_t a_off, size_t b_off, size_t len, size_t pos)
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{
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char *a_str, *b_str, a_orig, b_orig;
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a[a_off] = '\0';
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b[b_off] = '\0';
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a_str = a + a_off + 1;
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b_str = b + b_off + 1;
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a_str[len] = '\0';
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b_str[len] = '\0';
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a_str[len+1] = 'A';
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b_str[len+1] = 'B';
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a_orig = a_str[pos];
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b_orig = b_str[pos];
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alignment_testcase(a_str, b_str, 0, len + 16);
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alignment_testcase(a_str, b_str, 0, len + 1);
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alignment_testcase(a_str, b_str, 0, len);
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if (pos < len) {
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a_str[pos] = '\0';
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alignment_testcase(a_str, b_str, -1, len + 16);
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alignment_testcase(a_str, b_str, -1, len + 1);
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alignment_testcase(a_str, b_str, -1, len);
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alignment_testcase(a_str, b_str, -1, pos + 1);
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alignment_testcase(a_str, b_str, 0, pos);
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a_str[pos] = a_orig;
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b_str[pos] = '\0';
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alignment_testcase(a_str, b_str, 1, len + 16);
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alignment_testcase(a_str, b_str, 1, len + 1);
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alignment_testcase(a_str, b_str, 1, len);
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alignment_testcase(a_str, b_str, 1, pos + 1);
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alignment_testcase(a_str, b_str, 0, pos);
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b_str[pos] = b_orig;
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}
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a_str[pos] = 'X';
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alignment_testcase(a_str, b_str, 1, len + 16);
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alignment_testcase(a_str, b_str, 0, pos);
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alignment_testcase(a_str, b_str, 1, pos + 1);
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if (pos < len) {
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alignment_testcase(a_str, b_str, 1, len);
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alignment_testcase(a_str, b_str, 1, len + 1);
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}
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a_str[pos] = a_orig;
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b_str[pos] = 'X';
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alignment_testcase(a_str, b_str, -1, len + 16);
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alignment_testcase(a_str, b_str, 0, pos);
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alignment_testcase(a_str, b_str, -1, pos + 1);
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if (pos < len) {
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alignment_testcase(a_str, b_str, -1, len);
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alignment_testcase(a_str, b_str, -1, len + 1);
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}
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b_str[pos] = b_orig;
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a[a_off] = '-';
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b[b_off] = '-';
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a_str[len] = '-';
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b_str[len] = '-';
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a_str[len+1] = '-';
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b_str[len+1] = '-';
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}
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ATF_TC(strncmp_alignments);
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ATF_TC_HEAD(strncmp_alignments, tc)
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{
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atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with various alignments");
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}
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ATF_TC_BODY(strncmp_alignments, tc)
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{
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size_t a_off, b_off, len, pos;
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char a[64+16+16+3], b[64+16+16+3];
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memset(a, '-', sizeof(a));
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memset(b, '-', sizeof(b));
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a[sizeof(a) - 1] = '\0';
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b[sizeof(b) - 1] = '\0';
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for (a_off = 0; a_off < 16; a_off++)
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for (b_off = 0; b_off < 16; b_off++)
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for (len = 1; len <= 64; len++)
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for (pos = 0; pos <= len; pos++)
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check_strncmp_alignments(a, b, a_off, b_off, len, pos);
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}
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ATF_TC(strncmp_null);
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ATF_TC_HEAD(strncmp_null, tc)
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{
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atf_tc_set_md_var(tc, "descr", "Test strncmp(3) with null pointers");
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}
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ATF_TC_BODY(strncmp_null, tc)
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{
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alignment_testcase(NULL, NULL, 0, 0);
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}
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ATF_TP_ADD_TCS(tp)
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{
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void *dl_handle;
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dl_handle = dlopen(NULL, RTLD_LAZY);
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strncmp_fn = dlsym(dl_handle, "test_strncmp");
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if (strncmp_fn == NULL)
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strncmp_fn = strncmp;
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ATF_TP_ADD_TC(tp, strncmp_alignments);
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ATF_TP_ADD_TC(tp, strncmp_null);
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return atf_no_error();
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}
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