tests/test-c32swidth.c

   1 /* Test of c32swidth() function.
   2    Copyright (C) 2023-2024 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 <uchar.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (c32swidth, int, (const char32_t *, size_t));
  25
  26 #include <locale.h>
  27 #include <string.h>
  28
  29 #include "localcharset.h"
  30 #include "macros.h"
  31
  32 int
  33 main ()
  34 {
  35   int w;
  36
  37   /* Switch to an UTF-8 locale.  */
  38   if (!((setlocale (LC_ALL, "fr_FR.UTF-8") != NULL
  39          || setlocale (LC_ALL, "de_DE.UTF-8") != NULL
  40          || setlocale (LC_ALL, "es_ES.UTF-8") != NULL
  41          || setlocale (LC_ALL, "en_US.UTF-8") != NULL)
  42         /* Check whether it's really an UTF-8 locale.
  43            On native Windows, these setlocale calls succeed but the encoding
  44            of this locale is CP1252, not UTF-8.  */
  45         && strcmp (locale_charset (), "UTF-8") == 0))
  46     {
  47       fprintf (stderr, "Skipping test: No common Unicode locale is installed\n");
  48       return 77;
  49     }
  50
  51   {
  52     char32_t s[] = { 'f', 'p', 0, 'x' };
  53     w = c32swidth (s, 0);
  54     ASSERT (w == 0);
  55     w = c32swidth (s, 1);
  56     ASSERT (w == 1);
  57     w = c32swidth (s, 2);
  58     ASSERT (w == 2);
  59     w = c32swidth (s, 3);
  60     ASSERT (w == 2);
  61     w = c32swidth (s, 4);
  62     ASSERT (w == 2);
  63     w = c32swidth (s, (size_t)(-1));
  64     ASSERT (w == 2);
  65   }
  66
  67   {
  68     char32_t s[] = { 'f', 'p', '\n', 'x' };
  69     w = c32swidth (s, 0);
  70     ASSERT (w == 0);
  71     w = c32swidth (s, 1);
  72     ASSERT (w == 1);
  73     w = c32swidth (s, 2);
  74     ASSERT (w == 2);
  75     w = c32swidth (s, 3);
  76     ASSERT (w == -1);
  77     w = c32swidth (s, 4);
  78     ASSERT (w == -1);
  79   }
  80
  81   /* Test width of some non-spacing characters.  */
  82   {
  83     char32_t s[] = { 'a', 0x0301 };
  84     w = c32swidth (s, 2);
  85     ASSERT (w == 1);
  86   }
  87
  88   /* Test width of some zero width characters.  */
  89   {
  90     char32_t s[] = { 'i', 0x200B, 'j' };
  91     w = c32swidth (s, 3);
  92     ASSERT (w == 2);
  93   }
  94
  95   /* Test width of some math symbols.
  96      U+2202 is marked as having ambiguous width (A) in EastAsianWidth.txt
  97      (see <https://www.unicode.org/Public/12.0.0/ucd/EastAsianWidth.txt>).
  98      The Unicode Standard Annex 11
  99      <https://www.unicode.org/reports/tr11/tr11-36.html>
 100      says
 101        "Ambiguous characters behave like wide or narrow characters
 102         depending on the context (language tag, script identification,
 103         associated font, source of data, or explicit markup; all can
 104         provide the context). If the context cannot be established
 105         reliably, they should be treated as narrow characters by default."
 106      For c32width(), the only available context information is the locale.
 107      The chosen locale above is a Western locale, not an East Asian locale,
 108      therefore U+2202 should be treated like a narrow character.  */
 109   {
 110     char32_t s[] = { 0x2202 };
 111     w = c32swidth (s, 1);
 112     ASSERT (w == 1);
 113   }
 114
 115   /* Test width of some CJK characters.  */
 116   {
 117     char32_t s[] = { 0x4E2D, 0x6587 };
 118     w = c32swidth (s, 2);
 119     ASSERT (w == 4);
 120   }
 121   {
 122     char32_t s[] = { 0x20369, 0x2F876 };
 123     w = c32swidth (s, 2);
 124     ASSERT (w == 4);
 125   }
 126
 127   return test_exit_status;
 128 }