110 lines
3.6 KiB
C
110 lines
3.6 KiB
C
/* Test of wmemcmp() function.
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Copyright (C) 2008-2024 Free Software Foundation, Inc.
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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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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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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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/* Written by Bruno Haible <bruno@clisp.org>, 2023. */
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#include <config.h>
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#include <wchar.h>
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#include "signature.h"
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SIGNATURE_CHECK (wmemcmp, int, (const wchar_t *, const wchar_t *, size_t));
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#include "macros.h"
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int
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main (int argc, char *argv[])
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{
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/* Test equal / not equal distinction. */
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{
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static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
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static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
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ASSERT (wmemcmp (input1, input2, 2) == 0);
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ASSERT (wmemcmp (input1, input2, 3) == 0);
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ASSERT (wmemcmp (input1, input2, 4) != 0);
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}
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{
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static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
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static const wchar_t input2[] = { 'b', 'a', 'r', 0 };
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ASSERT (wmemcmp (input1, input2, 1) != 0);
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ASSERT (wmemcmp (input1, input2, 3) != 0);
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}
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/* Test less / equal / greater distinction. */
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{
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static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
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static const wchar_t input2[] = { 'm', 'o', 'o', 0 };
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ASSERT (wmemcmp (input1, input2, 4) < 0);
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ASSERT (wmemcmp (input2, input1, 4) > 0);
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}
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{
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static const wchar_t input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
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static const wchar_t input2[] = { 'o', 'o', 'p', 's', 0 };
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ASSERT (wmemcmp (input1, input2, 3) < 0);
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ASSERT (wmemcmp (input2, input1, 3) > 0);
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}
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{
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static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
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static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
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ASSERT (wmemcmp (input1, input2, 4) < 0);
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ASSERT (wmemcmp (input2, input1, 4) > 0);
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}
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/* ISO C requires wcscmp to work with all wchar_t values.
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ISO C 17 § 7.29.4.4 says:
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"Unless explicitly stated otherwise, the functions described in this
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subclause order two wide characters the same way as two integers of
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the underlying integer type designated by wchar_t." */
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{
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static const wchar_t input1[] = { (wchar_t) 0x76547654 };
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static const wchar_t input2[] = { (wchar_t) 0x9abc9abc };
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if ((wchar_t)-1 < 0)
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{
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/* wchar_t is signed. */
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ASSERT (wmemcmp (input1, input2, 1) > 0);
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ASSERT (wmemcmp (input2, input1, 1) < 0);
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}
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else
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{
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/* wchar_t is unsigned. */
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ASSERT (wmemcmp (input1, input2, 1) < 0);
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ASSERT (wmemcmp (input2, input1, 1) > 0);
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}
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}
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{
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static const wchar_t input1[] = { (wchar_t) 0x9abc9abc };
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static const wchar_t input2[] = { (wchar_t) 0x9bdf9bdf };
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ASSERT (wmemcmp (input1, input2, 1) < 0);
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ASSERT (wmemcmp (input2, input1, 1) > 0);
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}
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int volatile value;
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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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value = (wmemcmp (NULL, L"x", 0) == 0);
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ASSERT (value);
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value = (wmemcmp (L"x", NULL, 0) == 0);
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ASSERT (value);
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value = (wmemcmp (NULL, NULL, 0) == 0);
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ASSERT (value);
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return test_exit_status;
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}
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