kc3-lang/gnulib/tests/test-wcsncmp.c

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• Hash : 5b92dd0a
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  Date : 2024-01-01T10:31:48
  

  maint: run 'make update-copyright'
  

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• tests/test-wcsncmp.c

• /* Test of wcsncmp() function.
     Copyright (C) 2010-2024 Free Software Foundation, Inc.
  
     This program is free software: you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation, either version 3 of the License, or
     (at your option) any later version.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  
  /* Written by Bruno Haible <bruno@clisp.org>, 2023.  */
  
  #include <config.h>
  
  #include <wchar.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (wcsncmp, int, (const wchar_t *, const wchar_t *, size_t));
  
  #include "macros.h"
  
  int
  main (int argc, char *argv[])
  {
    /* Test simple cases.  */
    {
      static const wchar_t input1[] = { 0 };
      static const wchar_t input2[] = { 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) == 0);
      ASSERT (wcsncmp (input1, input2, 1000000) == 0);
    }
    {
      static const wchar_t input1[] = { 0 };
      static const wchar_t input2[] = { 'f', 'o', 'o', 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) < 0);
      ASSERT (wcsncmp (input2, input1, 1) > 0);
      ASSERT (wcsncmp (input1, input2, 3) < 0);
      ASSERT (wcsncmp (input2, input1, 3) > 0);
      ASSERT (wcsncmp (input1, input2, 4) < 0);
      ASSERT (wcsncmp (input2, input1, 4) > 0);
      ASSERT (wcsncmp (input1, input2, 1000000) < 0);
      ASSERT (wcsncmp (input2, input1, 1000000) > 0);
    }
    {
      static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
      static const wchar_t input2[] = { 'f', 'o', 'o', 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) == 0);
      ASSERT (wcsncmp (input1, input2, 2) == 0);
      ASSERT (wcsncmp (input1, input2, 3) == 0);
      ASSERT (wcsncmp (input1, input2, 4) == 0);
      ASSERT (wcsncmp (input1, input2, 1000000) == 0);
    }
    {
      static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
      static const wchar_t input2[] = { 'b', 'a', 'r', 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) > 0);
      ASSERT (wcsncmp (input2, input1, 1) < 0);
      ASSERT (wcsncmp (input1, input2, 2) > 0);
      ASSERT (wcsncmp (input2, input1, 2) < 0);
      ASSERT (wcsncmp (input1, input2, 1000000) > 0);
      ASSERT (wcsncmp (input2, input1, 1000000) < 0);
    }
    {
      static const wchar_t input1[] = { 'f', 'o', 'o', 0 };
      static const wchar_t input2[] = { 'f', 'o', 'o', 'b', 'a', 'r', 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) == 0);
      ASSERT (wcsncmp (input1, input2, 2) == 0);
      ASSERT (wcsncmp (input1, input2, 3) == 0);
      ASSERT (wcsncmp (input1, input2, 4) < 0);
      ASSERT (wcsncmp (input2, input1, 4) > 0);
      ASSERT (wcsncmp (input1, input2, 1000000) < 0);
      ASSERT (wcsncmp (input2, input1, 1000000) > 0);
    }
    {
      static const wchar_t input1[] = { 'o', 'o', 'm', 'p', 'h', 0 };
      static const wchar_t input2[] = { 'o', 'o', 'p', 's', 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) == 0);
      ASSERT (wcsncmp (input1, input2, 2) == 0);
      ASSERT (wcsncmp (input1, input2, 3) < 0);
      ASSERT (wcsncmp (input2, input1, 3) > 0);
      ASSERT (wcsncmp (input1, input2, 4) < 0);
      ASSERT (wcsncmp (input2, input1, 4) > 0);
      ASSERT (wcsncmp (input1, input2, 5) < 0);
      ASSERT (wcsncmp (input2, input1, 5) > 0);
      ASSERT (wcsncmp (input1, input2, 6) < 0);
      ASSERT (wcsncmp (input2, input1, 6) > 0);
      ASSERT (wcsncmp (input1, input2, 1000000) < 0);
      ASSERT (wcsncmp (input2, input1, 1000000) > 0);
    }
  
    /* ISO C requires wcsncmp to work with all wchar_t values.
       ISO C 17 § 7.29.4.4 says:
         "Unless explicitly stated otherwise, the functions described in this
          subclause order two wide characters the same way as two integers of
          the underlying integer type designated by wchar_t."  */
    {
      static const wchar_t input1[] = { (wchar_t) 0x76547654, 0 };
      static const wchar_t input2[] = { (wchar_t) 0x9abc9abc, 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      if ((wchar_t)-1 < 0)
        {
          /* wchar_t is signed.  */
          ASSERT (wcsncmp (input1, input2, 1) > 0);
          ASSERT (wcsncmp (input2, input1, 1) < 0);
          ASSERT (wcsncmp (input1, input2, 2) > 0);
          ASSERT (wcsncmp (input2, input1, 2) < 0);
          ASSERT (wcsncmp (input1, input2, 1000000) > 0);
          ASSERT (wcsncmp (input2, input1, 1000000) < 0);
        }
      else
        {
          /* wchar_t is unsigned.  */
          ASSERT (wcsncmp (input1, input2, 1) < 0);
          ASSERT (wcsncmp (input2, input1, 1) > 0);
          ASSERT (wcsncmp (input1, input2, 2) < 0);
          ASSERT (wcsncmp (input2, input1, 2) > 0);
          ASSERT (wcsncmp (input1, input2, 1000000) < 0);
          ASSERT (wcsncmp (input2, input1, 1000000) > 0);
        }
    }
    {
      static const wchar_t input1[] = { (wchar_t) 0x9abc9abc, 0 };
      static const wchar_t input2[] = { (wchar_t) 0x9bdf9bdf, 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) < 0);
      ASSERT (wcsncmp (input2, input1, 1) > 0);
      ASSERT (wcsncmp (input1, input2, 2) < 0);
      ASSERT (wcsncmp (input2, input1, 2) > 0);
      ASSERT (wcsncmp (input1, input2, 1000000) < 0);
      ASSERT (wcsncmp (input2, input1, 1000000) > 0);
    }
  
    /* Comparing a negative wchar_t value against a null wchar_t.
       ISO C 17 § 7.29.4.4.1 says:
         "The wcsncmp function compares the wide string pointed to by s1 to
          the wide string pointed to by s2."
       ISO C 17 § 7.1.1 defines the term "wide string":
         "A wide string is a contiguous sequence of wide characters terminated
          by and including the first null wide character."
       This means that the comparison extends up to and *including* the first
       null wchar_t.  */
    {
      static const wchar_t input1[] = { (wchar_t) 'x', 0 };
      static const wchar_t input2[] = { (wchar_t) 'x', (wchar_t) 0x9abc9abc, 0 };
      ASSERT (wcsncmp (input1, input2, 0) == 0);
      ASSERT (wcsncmp (input1, input2, 1) == 0);
      if ((wchar_t)-1 < 0)
        {
          /* wchar_t is signed.  */
          ASSERT (wcsncmp (input1, input2, 2) > 0);
          ASSERT (wcsncmp (input2, input1, 2) < 0);
          ASSERT (wcsncmp (input1, input2, 3) > 0);
          ASSERT (wcsncmp (input2, input1, 3) < 0);
          ASSERT (wcsncmp (input1, input2, 1000000) > 0);
          ASSERT (wcsncmp (input2, input1, 1000000) < 0);
        }
      else
        {
          /* wchar_t is unsigned.  */
          ASSERT (wcsncmp (input1, input2, 2) < 0);
          ASSERT (wcsncmp (input2, input1, 2) > 0);
          ASSERT (wcsncmp (input1, input2, 3) < 0);
          ASSERT (wcsncmp (input2, input1, 3) > 0);
          ASSERT (wcsncmp (input1, input2, 1000000) < 0);
          ASSERT (wcsncmp (input2, input1, 1000000) > 0);
        }
    }
  
    return 0;
  }
  

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