1  /* Test of c32width() function.
       2     Copyright (C) 2007-2023 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>, 2007.  */
      18  
      19  #include <config.h>
      20  
      21  #include <uchar.h>
      22  
      23  #include "signature.h"
      24  SIGNATURE_CHECK (c32width, int, (char32_t));
      25  
      26  #include <locale.h>
      27  #include <string.h>
      28  
      29  #include "c-ctype.h"
      30  #include "localcharset.h"
      31  #include "macros.h"
      32  
      33  int
      34  main ()
      35  {
      36    char32_t wc;
      37  
      38  #if !GNULIB_WCHAR_SINGLE_LOCALE
      39  # ifdef C_CTYPE_ASCII
      40    /* Test width of ASCII characters.  */
      41    for (wc = 0x20; wc < 0x7F; wc++)
      42      ASSERT (c32width (wc) == 1);
      43  # endif
      44  #endif
      45  
      46    /* Switch to an UTF-8 locale.  */
      47    if (setlocale (LC_ALL, "fr_FR.UTF-8") != NULL
      48        /* Check whether it's really an UTF-8 locale.
      49           On OpenBSD 4.0, the setlocale call succeeds only for the LC_CTYPE
      50           category and therefore returns "C/fr_FR.UTF-8/C/C/C/C", but the
      51           LC_CTYPE category is effectively set to an ASCII LC_CTYPE category;
      52           in particular, locale_charset() returns "ASCII".  */
      53        && strcmp (locale_charset (), "UTF-8") == 0)
      54      {
      55        /* Test width of ASCII characters.  */
      56        for (wc = 0x20; wc < 0x7F; wc++)
      57          ASSERT (c32width (wc) == 1);
      58  
      59        /* Test width of some non-spacing characters.  */
      60        ASSERT (c32width (0x0301) == 0);
      61        ASSERT (c32width (0x05B0) == 0);
      62  
      63        /* Test width of some format control characters.  */
      64        ASSERT (c32width (0x200E) <= 0);
      65        ASSERT (c32width (0x2060) <= 0);
      66        ASSERT (c32width (0xE0001) <= 0);
      67        ASSERT (c32width (0xE0044) <= 0);
      68  
      69        /* Test width of some zero width characters.  */
      70        /* While it is desirable that U+200B, U+200C, U+200D have width 0,
      71           because this makes wcswidth work better on strings that contain these
      72           characters, it is acceptable if an implementation treats these
      73           characters like control characters.  */
      74        ASSERT (c32width (0x200B) <= 0);
      75        ASSERT (c32width (0xFEFF) <= 0);
      76  
      77        /* Test width of some math symbols.
      78           U+2202 is marked as having ambiguous width (A) in EastAsianWidth.txt
      79           (see <https://www.unicode.org/Public/12.0.0/ucd/EastAsianWidth.txt>).
      80           The Unicode Standard Annex 11
      81           <https://www.unicode.org/reports/tr11/tr11-36.html>
      82           says
      83             "Ambiguous characters behave like wide or narrow characters
      84              depending on the context (language tag, script identification,
      85              associated font, source of data, or explicit markup; all can
      86              provide the context). If the context cannot be established
      87              reliably, they should be treated as narrow characters by default."
      88           For c32width(), the only available context information is the locale.
      89           "fr_FR.UTF-8" is a Western locale, not an East Asian locale, therefore
      90           U+2202 should be treated like a narrow character.  */
      91        ASSERT (c32width (0x2202) == 1);
      92  
      93        /* Test width of some CJK characters.  */
      94        ASSERT (c32width (0x3000) == 2);
      95        ASSERT (c32width (0xB250) == 2);
      96        ASSERT (c32width (0xFF1A) == 2);
      97        #if !(defined __FreeBSD__ && __FreeBSD__ < 13 && !defined __GLIBC__)
      98        ASSERT (c32width (0x20369) == 2);
      99        ASSERT (c32width (0x2F876) == 2);
     100        #endif
     101      }
     102  
     103    return 0;
     104  }