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| <title>Using as: Strings</title> |
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| 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> |
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| <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>\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-_0028_005cr_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> |
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| 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> |
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