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diff --git a/doc/libunistring_19.html b/doc/libunistring_19.html index e0eee13..055ca60 100644 --- a/doc/libunistring_19.html +++ b/doc/libunistring_19.html @@ -1,6 +1,6 @@ <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html401/loose.dtd"> <html> -<!-- Created on May, 25 2018 by texi2html 1.78a --> +<!-- Created on January, 2 2022 by texi2html 1.78a --> <!-- Written by: Lionel Cons <Lionel.Cons@cern.ch> (original author) Karl Berry <karl@freefriends.org> @@ -11,10 +11,10 @@ Send bugs and suggestions to <texi2html-bug@nongnu.org> --> <head> -<title>GNU libunistring: B. Licenses</title> +<title>GNU libunistring: B. The char32_t problem</title> -<meta name="description" content="GNU libunistring: B. Licenses"> -<meta name="keywords" content="GNU libunistring: B. Licenses"> +<meta name="description" content="GNU libunistring: B. The char32_t problem"> +<meta name="keywords" content="GNU libunistring: B. The char32_t problem"> <meta name="resource-type" content="document"> <meta name="distribution" content="global"> <meta name="Generator" content="texi2html 1.78a"> @@ -43,1499 +43,86 @@ ul.toc {list-style: none} <table cellpadding="1" cellspacing="1" border="0"> <tr><td valign="middle" align="left">[<a href="libunistring_18.html#SEC81" title="Beginning of this chapter or previous chapter"> << </a>]</td> -<td valign="middle" align="left">[<a href="libunistring_20.html#SEC91" title="Next chapter"> >> </a>]</td> +<td valign="middle" align="left">[<a href="libunistring_20.html#SEC83" title="Next chapter"> >> </a>]</td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> <td valign="middle" align="left"> </td> -<td valign="middle" align="left">[<a href="libunistring.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> -<td valign="middle" align="left">[<a href="libunistring.html#SEC_Contents" title="Table of contents">Contents</a>]</td> -<td valign="middle" align="left">[<a href="libunistring_20.html#SEC91" title="Index">Index</a>]</td> +<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Top" title="Cover (top) of document">Top</a>]</td> +<td valign="middle" align="left">[<a href="libunistring_toc.html#SEC_Contents" title="Table of contents">Contents</a>]</td> +<td valign="middle" align="left">[<a href="libunistring_21.html#SEC92" title="Index">Index</a>]</td> <td valign="middle" align="left">[<a href="libunistring_abt.html#SEC_About" title="About (help)"> ? </a>]</td> </tr></table> <hr size="2"> -<a name="Licenses"></a> +<a name="The-char32_005ft-problem"></a> <a name="SEC82"></a> -<h1 class="appendix"> <a href="libunistring.html#TOC82">B. Licenses</a> </h1> - -<p>The files of this package are covered by the licenses indicated in each -particular file or directory. Here is a summary: -</p> -<ul> +<h1 class="appendix"> <a href="libunistring_toc.html#TOC82">B. The <code>char32_t</code> problem</a> </h1> + +<p>In response to the <code>wchar_t</code> mess described in the previous section, +ISO C 11 introduces two new types: <code>char32_t</code> and <code>char16_t</code>. +</p> +<p><code>char32_t</code> is a type like <code>wchar_t</code>, with the added guarantee that it +is 32 bits wide. So, it is a type that is appropriate for encoding a Unicode +character. It is meant to resolve the problems of the 16-bit wide +<code>wchar_t</code> on AIX and Windows platforms, and allow a saner programming model +for wide character strings across all platforms. +</p> +<p><code>char16_t</code> is a type like <code>wchar_t</code>, with the added guarantee that it +is 16 bits wide. It is meant to allow porting programs that use the broken wide +character strings programming model from Windows to all platforms. Of course, +no one needs this. +</p> +<p>These types are accompanied with a syntax for defining wide string literals with +these element types: <code>u"..."</code> and <code>U"..."</code>. +</p> +<p>So far, so good. What the ISO C designers forgot, is to provide standardized C +library functions that operate on these wide character strings. They +standardized only the most basic functions, <code>mbrtoc32</code> and <code>c32rtomb</code>, +which are analogous to <code>mbrtowc</code> and <code>wcrtomb</code>, respectively. For the +rest, GNU gnulib <a href="https://www.gnu.org/software/gnulib/">https://www.gnu.org/software/gnulib/</a> provides the +functions: +</p><ul> <li> -The <code>libunistring</code> library and its header files are dual-licensed under -"the GNU LGPLv3+ or the GNU GPLv2". This means, you can use it under either -<ul> -<li> - -the terms of the GNU Lesser General Public License (LGPL) version 3 or -(at your option) any later version, or -</li><li> - -the terms of the GNU General Public License (GPL) version 2, or -</li><li> - -the same dual license "the GNU LGPLv3+ or the GNU GPLv2". -</li></ul> -<p>You find the GNU LGPL version 3 in <a href="#SEC88">GNU LESSER GENERAL PUBLIC LICENSE</a>. This license is -based on the GNU GPL version 3, see <a href="#SEC83">GNU GENERAL PUBLIC LICENSE</a>. -<br> -You can find the GNU GPL version 2 at -<a href="https://www.gnu.org/licenses/old-licenses/gpl-2.0.html">https://www.gnu.org/licenses/old-licenses/gpl-2.0.html</a>. -<br> -Note: This dual license makes it possible for the <code>libunistring</code> library -to be used by packages under GPLv2 or GPLv2+ licenses, in particular. See -the table in <a href="https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility">https://www.gnu.org/licenses/gpl-faq.html#AllCompatibility</a>. -</p> - +Functions for converting an entire string: <code>mbstoc32s</code> – like +<code>mbstowcs</code>, <code>c32stombs</code> – like <code>wcstombs</code>. </li><li> -This manual is free documentation. It is dually licensed under the -GNU FDL and the GNU GPL. This means that you can redistribute this -manual under either of these two licenses, at your choice. -<br> -This manual is covered by the GNU FDL. Permission is granted to copy, -distribute and/or modify this document under the terms of the -GNU Free Documentation License (FDL), either version 1.2 of the -License, or (at your option) any later version published by the -Free Software Foundation (FSF); with no Invariant Sections, with no -Front-Cover Text, and with no Back-Cover Texts. -A copy of the license is included in <a href="#SEC89">GNU Free Documentation License</a>. -<br> -This manual is covered by the GNU GPL. You can redistribute it and/or -modify it under the terms of the GNU General Public License (GPL), either -version 3 of the License, or (at your option) any later version published -by the Free Software Foundation (FSF). -A copy of the license is included in <a href="#SEC83">GNU GENERAL PUBLIC LICENSE</a>. +Functions for testing the properties of a 32-bit wide character: +<code>c32isalnum</code>, <code>c32isalpha</code>, etc. – like <code>iswalnum</code>, +<code>iswalpha</code>, etc. </li></ul> - - -<hr size="6"> -<a name="GNU-GPL"></a> -<a name="SEC83"></a> -<h2 class="appendixsec"> <a href="libunistring.html#TOC83">B.1 GNU GENERAL PUBLIC LICENSE</a> </h2> -<p align="center"> Version 3, 29 June 2007 -</p> - -<table><tr><td> </td><td><pre class="display">Copyright © 2007 Free Software Foundation, Inc. <a href="http://fsf.org/">http://fsf.org/</a> - -Everyone is permitted to copy and distribute verbatim copies of this -license document, but changing it is not allowed. -</pre></td></tr></table> - -<a name="SEC84"></a> -<h2 class="heading"> Preamble </h2> - -<p>The GNU General Public License is a free, copyleft license for -software and other kinds of works. -</p> -<p>The licenses for most software and other practical works are designed -to take away your freedom to share and change the works. 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A copy of the license is included in the section entitled ``GNU - Free Documentation License''. -</pre></td></tr></table> - -<p>If you have Invariant Sections, Front-Cover Texts and Back-Cover Texts, -replace the “with…Texts.” line with this: -</p> -<table><tr><td> </td><td><pre class="smallexample"> with the Invariant Sections being <var>list their titles</var>, with - the Front-Cover Texts being <var>list</var>, and with the Back-Cover Texts - being <var>list</var>. -</pre></td></tr></table> - -<p>If you have Invariant Sections without Cover Texts, or some other -combination of the three, merge those two alternatives to suit the -situation. -</p> -<p>If your document contains nontrivial examples of program code, we -recommend releasing these examples in parallel under your choice of -free software license, such as the GNU General Public License, -to permit their use in free software. -</p> - +The <code>char32_t</code> encoding is locale dependent and undocumented. 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