tests/test-wmemcmp.c

   1 /* Test of wmemcmp() function.
   2    Copyright (C) 2008-2025 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 /* Test the library, not the compiler+library.  */
  29 static int
  30 lib_wmemcmp (wchar_t const *ws1, wchar_t const *ws2, size_t n)
  31 {
  32   return wmemcmp (ws1, ws2, n);
  33 }
  34 int (*volatile volatile_wmemcmp) (wchar_t const *, wchar_t const *, size_t)
  35   = lib_wmemcmp;
  36 #undef wmemcmp
  37 #define wmemcmp volatile_wmemcmp
  38
  39 int
  40 main (int argc, char *argv[])
  41 {
  42   /* Test equal / not equal distinction.  */
  43   {
  44     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  45     static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
  46     ASSERT (wmemcmp (input1, input2, 2) == 0);
  47     ASSERT (wmemcmp (input1, input2, 3) == 0);
  48     ASSERT (wmemcmp (input1, input2, 4) != 0);
  49   }
  50   {
  51     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  52     static const wchar_t input2[] = { 'b', 'a', 'r', 0 };
  53     ASSERT (wmemcmp (input1, input2, 1) != 0);
  54     ASSERT (wmemcmp (input1, input2, 3) != 0);
  55   }
  56
  57   /* Test less / equal / greater distinction.  */
  58   {
  59     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  60     static const wchar_t input2[] = { 'm', 'o', 'o', 0 };
  61     ASSERT (wmemcmp (input1, input2, 4) < 0);
  62     ASSERT (wmemcmp (input2, input1, 4) > 0);
  63   }
  64   {
  65     static const wchar_t input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
  66     static const wchar_t input2[] = { 'o', 'o', 'p', 's', 0 };
  67     ASSERT (wmemcmp (input1, input2, 3) < 0);
  68     ASSERT (wmemcmp (input2, input1, 3) > 0);
  69   }
  70   {
  71     static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
  72     static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
  73     ASSERT (wmemcmp (input1, input2, 4) < 0);
  74     ASSERT (wmemcmp (input2, input1, 4) > 0);
  75   }
  76
  77   /* ISO C requires wcscmp to work with all wchar_t values.
  78      ISO C 17 § 7.29.4.4 says:
  79        "Unless explicitly stated otherwise, the functions described in this
  80         subclause order two wide characters the same way as two integers of
  81         the underlying integer type designated by wchar_t."  */
  82   {
  83     static const wchar_t input1[] = { (wchar_t) 0x76547654 };
  84     static const wchar_t input2[] = { (wchar_t) 0x9abc9abc };
  85     if ((wchar_t)-1 < 0)
  86       {
  87         /* wchar_t is signed.  */
  88         ASSERT (wmemcmp (input1, input2, 1) > 0);
  89         ASSERT (wmemcmp (input2, input1, 1) < 0);
  90       }
  91     else
  92       {
  93         /* wchar_t is unsigned.  */
  94         ASSERT (wmemcmp (input1, input2, 1) < 0);
  95         ASSERT (wmemcmp (input2, input1, 1) > 0);
  96       }
  97   }
  98   {
  99     static const wchar_t input1[] = { (wchar_t) 0x9abc9abc };
 100     static const wchar_t input2[] = { (wchar_t) 0x9bdf9bdf };
 101     ASSERT (wmemcmp (input1, input2, 1) < 0);
 102     ASSERT (wmemcmp (input2, input1, 1) > 0);
 103   }
 104
 105   /* Test zero-length operations on NULL pointers, allowed by
 106      <https://www.open-std.org/jtc1/sc22/wg14/www/docs/n3322.pdf>.  */
 107   ASSERT (wmemcmp (NULL, L"x", 0) == 0);
 108   ASSERT (wmemcmp (L"x", NULL, 0) == 0);
 109   ASSERT (wmemcmp (NULL, NULL, 0) == 0);
 110
 111   return test_exit_status;
 112 }