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67ee70e8e0
* tests/test-bsearch.c (null_bsearch, main): Remove the #if from null_bsearch because having the same condition in main is enough. Move the comment explaining the #if from null_bsearch to main. * tests/test-memccpy.c (null_memccpy, main): Likewise. * tests/test-memchr.c (null_memchr, main): Likewise. * tests/test-memcmp.c (null_memcmp, main): Likewise. * tests/test-memcpy.c (null_memcpy, main): Likewise. * tests/test-memmove.c (null_memmove, main): Likewise. * tests/test-memset.c (null_memset, main): Likewise. * tests/test-memset_explicit.c (null_memset_explicit, main): Likewise. * tests/test-qsort.c (null_qsort, main): Likewise. * tests/test-strncat.c (null_strncat, main): Likewise. * tests/test-strncmp.c (null_strncmp, main): Likewise. * tests/test-strncpy.c (null_strncpy, main): Likewise. * tests/test-strndup.c (null_strndup, main): Likewise. * tests/test-wcsncat.c (null_wcsncat, main): Likewise. * tests/test-wcsncmp.c (null_wcsncmp, main): Likewise. * tests/test-wcsncpy.c (null_wcsncpy, main): Likewise.
109 lines
3.5 KiB
C
109 lines
3.5 KiB
C
/*
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* Copyright (C) 2008-2026 Free Software Foundation, Inc.
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* Written by Simon Josefsson
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <string.h>
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#include "signature.h"
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SIGNATURE_CHECK (memcmp, int, (void const *, void const *, size_t));
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#include "zerosize-ptr.h"
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#include "macros.h"
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/* Test the prototype in <string.h> + compiler. */
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static int
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null_memcmp (void const *s1, void const *s2, size_t n)
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{
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int r = memcmp (s1, s2, n);
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ASSERT (s1 == NULL);
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return r;
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}
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int (*volatile volatile_null_memcmp) (void const *, void const *, size_t)
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= null_memcmp;
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/* Test the library, not the compiler+library. */
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static int
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lib_memcmp (void const *s1, void const *s2, size_t n)
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{
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return memcmp (s1, s2, n);
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}
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int (*volatile volatile_lib_memcmp) (void const *, void const *, size_t)
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= lib_memcmp;
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#undef memcmp
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#define memcmp volatile_lib_memcmp
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int
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main (void)
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{
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/* Test equal / not equal distinction. */
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void *page_boundary1 = zerosize_ptr ();
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void *page_boundary2 = zerosize_ptr ();
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if (page_boundary1 && page_boundary2)
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ASSERT (memcmp (page_boundary1, page_boundary2, 0) == 0);
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ASSERT (memcmp ("foo", "foobar", 2) == 0);
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ASSERT (memcmp ("foo", "foobar", 3) == 0);
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ASSERT (memcmp ("foo", "foobar", 4) != 0);
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ASSERT (memcmp ("foo", "bar", 1) != 0);
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ASSERT (memcmp ("foo", "bar", 3) != 0);
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/* Test less / equal / greater distinction. */
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ASSERT (memcmp ("foo", "moo", 4) < 0);
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ASSERT (memcmp ("moo", "foo", 4) > 0);
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ASSERT (memcmp ("oomph", "oops", 3) < 0);
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ASSERT (memcmp ("oops", "oomph", 3) > 0);
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ASSERT (memcmp ("foo", "foobar", 4) < 0);
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ASSERT (memcmp ("foobar", "foo", 4) > 0);
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/* Some old versions of memcmp were not 8-bit clean. */
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ASSERT (memcmp ("\100", "\201", 1) < 0);
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ASSERT (memcmp ("\201", "\100", 1) > 0);
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ASSERT (memcmp ("\200", "\201", 1) < 0);
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ASSERT (memcmp ("\201", "\200", 1) > 0);
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/* The Next x86 OpenStep bug shows up only when comparing 16 bytes
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or more and with at least one buffer not starting on a 4-byte boundary.
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William Lewis provided this test program. */
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{
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char foo[21];
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char bar[21];
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for (int i = 0; i < 4; i++)
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{
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char *a = foo + i;
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char *b = bar + i;
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strcpy (a, "--------01111111");
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strcpy (b, "--------10000000");
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ASSERT (memcmp (a, b, 16) < 0);
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}
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}
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/* Test zero-length operations on NULL pointers, allowed by
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<https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.
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In GCC < 15 this is a builtin that has the nonnull attribute.
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Some glibc versions use the nonnull attribute, which breaks this test. */
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#if (! defined __GNUC__ || __GNUC__ >= 15 || defined __clang__) \
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&& (! defined __GLIBC__ || 2 < __GLIBC__ + (99 <= __GLIBC_MINOR__))
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ASSERT (memcmp (NULL, "x", 0) == 0);
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ASSERT (memcmp ("x", NULL, 0) == 0);
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ASSERT (memcmp (NULL, NULL, 0) == 0);
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ASSERT (volatile_null_memcmp (NULL, "x", 0) == 0);
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#endif
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return test_exit_status;
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}
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