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

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• Hash : 7b089321
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  Date : 2025-01-01T09:24:36
  

  maint: run 'make update-copyright'
  

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• tests/test-wcwidth.c

• /* Test of wcwidth() function.
     Copyright (C) 2007-2025 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>, 2007.  */
  
  #include <config.h>
  
  #include <wchar.h>
  
  #include "signature.h"
  SIGNATURE_CHECK (wcwidth, int, (wchar_t));
  
  #include <locale.h>
  #include <string.h>
  
  #include "c-ctype.h"
  #include "localcharset.h"
  #include "macros.h"
  
  int
  main ()
  {
    wchar_t wc;
  
  #if !GNULIB_WCHAR_SINGLE_LOCALE
  # ifdef C_CTYPE_ASCII
    /* Test width of ASCII characters.  */
    for (wc = 0x20; wc < 0x7F; wc++)
      ASSERT (wcwidth (wc) == 1);
  # endif
  #endif
  
    /* Switch to an UTF-8 locale.  */
    if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL
        /* Check whether it's really an UTF-8 locale.
           On OpenBSD 4.0, the setlocale call succeeds only for the LC_CTYPE
           category and therefore returns "C/fr_FR.UTF-8/C/C/C/C", but the
           LC_CTYPE category is effectively set to an ASCII LC_CTYPE category;
           in particular, locale_charset() returns "ASCII".  */
        && strcmp (locale_charset (), "UTF-8") == 0)
      {
        /* Test width of ASCII characters.  */
        for (wc = 0x20; wc < 0x7F; wc++)
          ASSERT (wcwidth (wc) == 1);
  
        /* Test width of some non-spacing characters.  */
        ASSERT (wcwidth (0x0301) == 0);
        ASSERT (wcwidth (0x05B0) == 0);
  
        /* Test width of some format control characters.  */
        ASSERT (wcwidth (0x200E) <= 0);
        ASSERT (wcwidth (0x2060) <= 0);
  #if 0  /* wchar_t may be only 16 bits.  */
        ASSERT (wcwidth (0xE0001) <= 0);
        ASSERT (wcwidth (0xE0044) <= 0);
  #endif
  
        /* Test width of some zero width characters.  */
        /* While it is desirable that U+200B, U+200C, U+200D have width 0,
           because this makes wcswidth work better on strings that contain these
           characters, it is acceptable if an implementation treats these
           characters like control characters.  */
        ASSERT (wcwidth (0x200B) <= 0);
        ASSERT (wcwidth (0xFEFF) <= 0);
  
        /* Test width of some math symbols.
           U+2202 is marked as having ambiguous width (A) in EastAsianWidth.txt
           (see <https://www.unicode.org/Public/12.0.0/ucd/EastAsianWidth.txt>).
           The Unicode Standard Annex 11
           <https://www.unicode.org/reports/tr11/tr11-36.html>
           says
             "Ambiguous characters behave like wide or narrow characters
              depending on the context (language tag, script identification,
              associated font, source of data, or explicit markup; all can
              provide the context). If the context cannot be established
              reliably, they should be treated as narrow characters by default."
           For wcwidth(), the only available context information is the locale.
           "fr_FR.UTF-8" is a Western locale, not an East Asian locale, therefore
           U+2202 should be treated like a narrow character.  */
        ASSERT (wcwidth (0x2202) == 1);
  
        /* Test width of some CJK characters.  */
        ASSERT (wcwidth (0x3000) == 2);
        ASSERT (wcwidth (0xB250) == 2);
        ASSERT (wcwidth (0xFF1A) == 2);
  #if 0  /* wchar_t may be only 16 bits.  */
        ASSERT (wcwidth (0x20369) == 2);
        ASSERT (wcwidth (0x2F876) == 2);
  #endif
      }
  
    return test_exit_status;
  }
  

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