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.
170 lines
7.1 KiB
HTML
170 lines
7.1 KiB
HTML
4 years ago
|
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
|
||
|
|
<html>
|
||
|
|
<!-- This file documents the GNU Assembler "as".
|
||
|
|
|
||
|
|
Copyright (C) 1991-2019 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 no Invariant Sections, with no Front-Cover Texts, and with no
|
||
|
|
Back-Cover Texts. A copy of the license is included in the
|
||
|
|
section entitled "GNU Free Documentation License".
|
||
|
|
-->
|
||
|
|
<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
|
||
|
|
<head>
|
||
|
|
<title>Strings (Using as)</title>
|
||
|
|
|
||
|
|
<meta name="description" content="Strings (Using as)">
|
||
|
|
<meta name="keywords" content="Strings (Using as)">
|
||
|
|
<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="AS-Index.html#AS-Index" rel="index" title="AS Index">
|
||
|
|
<link href="index.html#SEC_Contents" rel="contents" title="Table of Contents">
|
||
|
|
<link href="Characters.html#Characters" rel="up" title="Characters">
|
||
|
|
<link href="Chars.html#Chars" rel="next" title="Chars">
|
||
|
|
<link href="Characters.html#Characters" rel="prev" title="Characters">
|
||
|
|
<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="Strings"></a>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Chars.html#Chars" accesskey="n" rel="next">Chars</a>, Up: <a href="Characters.html#Characters" accesskey="u" rel="up">Characters</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
<hr>
|
||
|
|
<a name="Strings-1"></a>
|
||
|
|
<h4 class="subsubsection">3.6.1.1 Strings</h4>
|
||
|
|
|
||
|
|
<a name="index-string-constants"></a>
|
||
|
|
<a name="index-constants_002c-string"></a>
|
||
|
|
<p>A <em>string</em> is written between double-quotes. It may contain
|
||
|
|
double-quotes or null characters. The way to get special characters
|
||
|
|
into a string is to <em>escape</em> these characters: precede them with
|
||
|
|
a backslash ‘<samp>\</samp>’ character. For example ‘<samp>\\</samp>’ represents
|
||
|
|
one backslash: the first <code>\</code> is an escape which tells
|
||
|
|
<code>as</code> to interpret the second character literally as a backslash
|
||
|
|
(which prevents <code>as</code> from recognizing the second <code>\</code> as an
|
||
|
|
escape character). The complete list of escapes follows.
|
||
|
|
</p>
|
||
|
|
<a name="index-escape-codes_002c-character"></a>
|
||
|
|
<a name="index-character-escape-codes"></a>
|
||
|
|
<dl compact="compact">
|
||
|
|
<dd><a name="index--_005cb-_0028backspace-character_0029"></a>
|
||
|
|
<a name="index-backspace-_0028_005cb_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\b</kbd></dt>
|
||
|
|
<dd><p>Mnemonic for backspace; for ASCII this is octal code 010.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005cf-_0028formfeed-character_0029"></a>
|
||
|
|
<a name="index-formfeed-_0028_005cf_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>backslash-f</kbd></dt>
|
||
|
|
<dd><p>Mnemonic for FormFeed; for ASCII this is octal code 014.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005cn-_0028newline-character_0029"></a>
|
||
|
|
<a name="index-newline-_0028_005cn_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\n</kbd></dt>
|
||
|
|
<dd><p>Mnemonic for newline; for ASCII this is octal code 012.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005cr-_0028carriage-return-character_0029"></a>
|
||
|
|
<a name="index-carriage-return-_0028backslash_002dr_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\r</kbd></dt>
|
||
|
|
<dd><p>Mnemonic for carriage-Return; for ASCII this is octal code 015.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005ct-_0028tab_0029"></a>
|
||
|
|
<a name="index-tab-_0028_005ct_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\t</kbd></dt>
|
||
|
|
<dd><p>Mnemonic for horizontal Tab; for ASCII this is octal code 011.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005cddd-_0028octal-character-code_0029"></a>
|
||
|
|
<a name="index-octal-character-code-_0028_005cddd_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\ <var>digit</var> <var>digit</var> <var>digit</var></kbd></dt>
|
||
|
|
<dd><p>An octal character code. The numeric code is 3 octal digits.
|
||
|
|
For compatibility with other Unix systems, 8 and 9 are accepted as digits:
|
||
|
|
for example, <code>\008</code> has the value 010, and <code>\009</code> the value 011.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005cxd_002e_002e_002e-_0028hex-character-code_0029"></a>
|
||
|
|
<a name="index-hex-character-code-_0028_005cxd_002e_002e_002e_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\<code>x</code> <var>hex-digits...</var></kbd></dt>
|
||
|
|
<dd><p>A hex character code. All trailing hex digits are combined. Either upper or
|
||
|
|
lower case <code>x</code> works.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005c_005c-_0028_005c-character_0029"></a>
|
||
|
|
<a name="index-backslash-_0028_005c_005c_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\\</kbd></dt>
|
||
|
|
<dd><p>Represents one ‘<samp>\</samp>’ character.
|
||
|
|
</p>
|
||
|
|
<a name="index--_005c_0022-_0028doublequote-character_0029"></a>
|
||
|
|
<a name="index-doublequote-_0028_005c_0022_0029"></a>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\"</kbd></dt>
|
||
|
|
<dd><p>Represents one ‘<samp>"</samp>’ character. Needed in strings to represent
|
||
|
|
this character, because an unescaped ‘<samp>"</samp>’ would end the string.
|
||
|
|
</p>
|
||
|
|
</dd>
|
||
|
|
<dt><kbd>\ <var>anything-else</var></kbd></dt>
|
||
|
|
<dd><p>Any other character when escaped by <kbd>\</kbd> gives a warning, but
|
||
|
|
assembles as if the ‘<samp>\</samp>’ was not present. The idea is that if
|
||
|
|
you used an escape sequence you clearly didn’t want the literal
|
||
|
|
interpretation of the following character. However <code>as</code> has no
|
||
|
|
other interpretation, so <code>as</code> knows it is giving you the wrong
|
||
|
|
code and warns you of the fact.
|
||
|
|
</p></dd>
|
||
|
|
</dl>
|
||
|
|
|
||
|
|
<p>Which characters are escapable, and what those escapes represent,
|
||
|
|
varies widely among assemblers. The current set is what we think
|
||
|
|
the BSD 4.2 assembler recognizes, and is a subset of what most C
|
||
|
|
compilers recognize. If you are in doubt, do not use an escape
|
||
|
|
sequence.
|
||
|
|
</p>
|
||
|
|
<hr>
|
||
|
|
<div class="header">
|
||
|
|
<p>
|
||
|
|
Next: <a href="Chars.html#Chars" accesskey="n" rel="next">Chars</a>, Up: <a href="Characters.html#Characters" accesskey="u" rel="up">Characters</a> [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
|
||
|
|
</div>
|
||
|
|
|
||
|
|
|
||
|
|
|
||
|
|
</body>
|
||
|
|
</html>
|