You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
182 lines
8.6 KiB
HTML
182 lines
8.6 KiB
HTML
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
|
<html>
|
|
<!-- Copyright (C) 1988-2018 Free Software Foundation, Inc.
|
|
|
|
Permission is granted to copy, distribute and/or modify this document
|
|
under the terms of the GNU Free Documentation License, Version 1.3 or
|
|
any later version published by the Free Software Foundation; with the
|
|
Invariant Sections being "Funding Free Software", the Front-Cover
|
|
Texts being (a) (see below), and with the Back-Cover Texts being (b)
|
|
(see below). A copy of the license is included in the section entitled
|
|
"GNU Free Documentation License".
|
|
|
|
(a) The FSF's Front-Cover Text is:
|
|
|
|
A GNU Manual
|
|
|
|
(b) The FSF's Back-Cover Text is:
|
|
|
|
You have freedom to copy and modify this GNU Manual, like GNU
|
|
software. Copies published by the Free Software Foundation raise
|
|
funds for GNU development. -->
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
|
<head>
|
|
<title>Characters implementation (Using the GNU Compiler Collection (GCC))</title>
|
|
|
|
<meta name="description" content="Characters implementation (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="keywords" content="Characters implementation (Using the GNU Compiler Collection (GCC))">
|
|
<meta name="resource-type" content="document">
|
|
<meta name="distribution" content="global">
|
|
<meta name="Generator" content="makeinfo">
|
|
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
|
|
<link href="index.html#Top" rel="start" title="Top">
|
|
<link href="Option-Index.html#Option-Index" rel="index" title="Option Index">
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
|
<link href="C-Implementation.html#C-Implementation" rel="up" title="C Implementation">
|
|
<link href="Integers-implementation.html#Integers-implementation" rel="next" title="Integers implementation">
|
|
<link href="Identifiers-implementation.html#Identifiers-implementation" rel="prev" title="Identifiers implementation">
|
|
<style type="text/css">
|
|
<!--
|
|
a.summary-letter {text-decoration: none}
|
|
blockquote.indentedblock {margin-right: 0em}
|
|
blockquote.smallindentedblock {margin-right: 0em; font-size: smaller}
|
|
blockquote.smallquotation {font-size: smaller}
|
|
div.display {margin-left: 3.2em}
|
|
div.example {margin-left: 3.2em}
|
|
div.lisp {margin-left: 3.2em}
|
|
div.smalldisplay {margin-left: 3.2em}
|
|
div.smallexample {margin-left: 3.2em}
|
|
div.smalllisp {margin-left: 3.2em}
|
|
kbd {font-style: oblique}
|
|
pre.display {font-family: inherit}
|
|
pre.format {font-family: inherit}
|
|
pre.menu-comment {font-family: serif}
|
|
pre.menu-preformatted {font-family: serif}
|
|
pre.smalldisplay {font-family: inherit; font-size: smaller}
|
|
pre.smallexample {font-size: smaller}
|
|
pre.smallformat {font-family: inherit; font-size: smaller}
|
|
pre.smalllisp {font-size: smaller}
|
|
span.nolinebreak {white-space: nowrap}
|
|
span.roman {font-family: initial; font-weight: normal}
|
|
span.sansserif {font-family: sans-serif; font-weight: normal}
|
|
ul.no-bullet {list-style: none}
|
|
-->
|
|
</style>
|
|
|
|
|
|
</head>
|
|
|
|
<body lang="en">
|
|
<a name="Characters-implementation"></a>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
<hr>
|
|
<a name="Characters"></a>
|
|
<h3 class="section">4.4 Characters</h3>
|
|
|
|
<ul>
|
|
<li> <cite>The number of bits in a byte (C90 3.4, C99 and C11 3.6).</cite>
|
|
|
|
<p>Determined by ABI.
|
|
</p>
|
|
</li><li> <cite>The values of the members of the execution character set (C90,
|
|
C99 and C11 5.2.1).</cite>
|
|
|
|
<p>Determined by ABI.
|
|
</p>
|
|
</li><li> <cite>The unique value of the member of the execution character set produced
|
|
for each of the standard alphabetic escape sequences (C90, C99 and C11
|
|
5.2.2).</cite>
|
|
|
|
<p>Determined by ABI.
|
|
</p>
|
|
</li><li> <cite>The value of a <code>char</code> object into which has been stored any
|
|
character other than a member of the basic execution character set
|
|
(C90 6.1.2.5, C99 and C11 6.2.5).</cite>
|
|
|
|
<p>Determined by ABI.
|
|
</p>
|
|
</li><li> <cite>Which of <code>signed char</code> or <code>unsigned char</code> has the same
|
|
range, representation, and behavior as “plain” <code>char</code> (C90
|
|
6.1.2.5, C90 6.2.1.1, C99 and C11 6.2.5, C99 and C11 6.3.1.1).</cite>
|
|
|
|
<a name="index-fsigned_002dchar-1"></a>
|
|
<a name="index-funsigned_002dchar-1"></a>
|
|
<p>Determined by ABI. The options <samp>-funsigned-char</samp> and
|
|
<samp>-fsigned-char</samp> change the default. See <a href="C-Dialect-Options.html#C-Dialect-Options">Options Controlling C Dialect</a>.
|
|
</p>
|
|
</li><li> <cite>The mapping of members of the source character set (in character
|
|
constants and string literals) to members of the execution character
|
|
set (C90 6.1.3.4, C99 and C11 6.4.4.4, C90, C99 and C11 5.1.1.2).</cite>
|
|
|
|
<p>Determined by ABI.
|
|
</p>
|
|
</li><li> <cite>The value of an integer character constant containing more than one
|
|
character or containing a character or escape sequence that does not map
|
|
to a single-byte execution character (C90 6.1.3.4, C99 and C11 6.4.4.4).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>.
|
|
</p>
|
|
</li><li> <cite>The value of a wide character constant containing more than one
|
|
multibyte character or a single multibyte character that maps to
|
|
multiple members of the extended execution character set, or
|
|
containing a multibyte character or escape sequence not represented in
|
|
the extended execution character set (C90 6.1.3.4, C99 and C11
|
|
6.4.4.4).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>.
|
|
</p>
|
|
</li><li> <cite>The current locale used to convert a wide character constant consisting
|
|
of a single multibyte character that maps to a member of the extended
|
|
execution character set into a corresponding wide character code (C90
|
|
6.1.3.4, C99 and C11 6.4.4.4).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>.
|
|
</p>
|
|
</li><li> <cite>Whether differently-prefixed wide string literal tokens can be
|
|
concatenated and, if so, the treatment of the resulting multibyte
|
|
character sequence (C11 6.4.5).</cite>
|
|
|
|
<p>Such tokens may not be concatenated.
|
|
</p>
|
|
</li><li> <cite>The current locale used to convert a wide string literal into
|
|
corresponding wide character codes (C90 6.1.4, C99 and C11 6.4.5).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>.
|
|
</p>
|
|
</li><li> <cite>The value of a string literal containing a multibyte character or escape
|
|
sequence not represented in the execution character set (C90 6.1.4,
|
|
C99 and C11 6.4.5).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>.
|
|
</p>
|
|
</li><li> <cite>The encoding of any of <code>wchar_t</code>, <code>char16_t</code>, and
|
|
<code>char32_t</code> where the corresponding standard encoding macro
|
|
(<code>__STDC_ISO_10646__</code>, <code>__STDC_UTF_16__</code>, or
|
|
<code>__STDC_UTF_32__</code>) is not defined (C11 6.10.8.2).</cite>
|
|
|
|
<p>See <a href="http://gcc.gnu.org/onlinedocs/cpp/Implementation_002ddefined-behavior.html#Implementation_002ddefined-behavior">Implementation-defined
|
|
behavior</a> in <cite>The C Preprocessor</cite>. <code>char16_t</code> and
|
|
<code>char32_t</code> literals are always encoded in UTF-16 and UTF-32
|
|
respectively.
|
|
</p>
|
|
</li></ul>
|
|
|
|
<hr>
|
|
<div class="header">
|
|
<p>
|
|
Next: <a href="Integers-implementation.html#Integers-implementation" accesskey="n" rel="next">Integers implementation</a>, Previous: <a href="Identifiers-implementation.html#Identifiers-implementation" accesskey="p" rel="prev">Identifiers implementation</a>, Up: <a href="C-Implementation.html#C-Implementation" accesskey="u" rel="up">C Implementation</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Option-Index.html#Option-Index" title="Index" rel="index">Index</a>]</p>
|
|
</div>
|
|
|
|
|
|
|
|
</body>
|
|
</html>
|