tests/test-wmemcmp.c

   1 /* Test of wmemcmp() function.
   2    Copyright (C) 2008-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
  18
  19 #include <config.h>
  20
  21 #include <wchar.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (wmemcmp, int, (const wchar_t *, const wchar_t *, size_t));
  25
  26 #include "macros.h"
  27
  28 int
  29 main (int argc, char *argv[])
  30 {
  31   /* Test equal / not equal distinction.  */
  32   {
  33     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  34     static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
  35     ASSERT (wmemcmp (input1, input2, 2) == 0);
  36     ASSERT (wmemcmp (input1, input2, 3) == 0);
  37     ASSERT (wmemcmp (input1, input2, 4) != 0);
  38   }
  39   {
  40     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  41     static const wchar_t input2[] = { 'b', 'a', 'r', 0 };
  42     ASSERT (wmemcmp (input1, input2, 1) != 0);
  43     ASSERT (wmemcmp (input1, input2, 3) != 0);
  44   }
  45
  46   /* Test less / equal / greater distinction.  */
  47   {
  48     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  49     static const wchar_t input2[] = { 'm', 'o', 'o', 0 };
  50     ASSERT (wmemcmp (input1, input2, 4) < 0);
  51     ASSERT (wmemcmp (input2, input1, 4) > 0);
  52   }
  53   {
  54     static const wchar_t input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
  55     static const wchar_t input2[] = { 'o', 'o', 'p', 's', 0 };
  56     ASSERT (wmemcmp (input1, input2, 3) < 0);
  57     ASSERT (wmemcmp (input2, input1, 3) > 0);
  58   }
  59   {
  60     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  61     static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
  62     ASSERT (wmemcmp (input1, input2, 4) < 0);
  63     ASSERT (wmemcmp (input2, input1, 4) > 0);
  64   }
  65
  66   /* ISO C requires wcscmp to work with all wchar_t values.
  67      ISO C 17 § 7.29.4.4 says:
  68        "Unless explicitly stated otherwise, the functions described in this
  69         subclause order two wide characters the same way as two integers of
  70         the underlying integer type designated by wchar_t."  */
  71   {
  72     static const wchar_t input1[] = { (wchar_t) 0x76547654 };
  73     static const wchar_t input2[] = { (wchar_t) 0x9abc9abc };
  74     if ((wchar_t)-1 < 0)
  75       {
  76         /* wchar_t is signed.  */
  77         ASSERT (wmemcmp (input1, input2, 1) > 0);
  78         ASSERT (wmemcmp (input2, input1, 1) < 0);
  79       }
  80     else
  81       {
  82         /* wchar_t is unsigned.  */
  83         ASSERT (wmemcmp (input1, input2, 1) < 0);
  84         ASSERT (wmemcmp (input2, input1, 1) > 0);
  85       }
  86   }
  87   {
  88     static const wchar_t input1[] = { (wchar_t) 0x9abc9abc };
  89     static const wchar_t input2[] = { (wchar_t) 0x9bdf9bdf };
  90     ASSERT (wmemcmp (input1, input2, 1) < 0);
  91     ASSERT (wmemcmp (input2, input1, 1) > 0);
  92   }
  93
  94   return test_exit_status;
  95 }