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111 lines
4.6 KiB
HTML
111 lines
4.6 KiB
HTML
4 years ago
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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
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<html>
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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>isprint (The Red Hat newlib C Library)</title>
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<meta name="description" content="isprint (The Red Hat newlib C Library)">
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<meta name="keywords" content="isprint (The Red Hat newlib C Library)">
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<meta name="resource-type" content="document">
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<meta name="distribution" content="global">
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<meta name="Generator" content="makeinfo">
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<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
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<link href="index.html#Top" rel="start" title="Top">
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<link href="Document-Index.html#Document-Index" rel="index" title="Document Index">
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<link href="Document-Index.html#SEC_Contents" rel="contents" title="Table of Contents">
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<link href="Ctype.html#Ctype" rel="up" title="Ctype">
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<link href="ispunct.html#ispunct" rel="next" title="ispunct">
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<link href="islower.html#islower" rel="prev" title="islower">
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<style type="text/css">
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ul.no-bullet {list-style: none}
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</head>
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<body lang="en">
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<a name="isprint"></a>
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<div class="header">
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<p>
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Next: <a href="ispunct.html#ispunct" accesskey="n" rel="next">ispunct</a>, Previous: <a href="islower.html#islower" accesskey="p" rel="prev">islower</a>, Up: <a href="Ctype.html#Ctype" accesskey="u" rel="up">Ctype</a> [<a href="Document-Index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="Document-Index.html#Document-Index" title="Index" rel="index">Index</a>]</p>
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</div>
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<hr>
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<a name="isprint_002c-isgraph_002c-isprint_005fl_002c-isgraph_005fl_002d_002d_002dprintable-character-predicates"></a>
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<h3 class="section">3.8 <code>isprint</code>, <code>isgraph</code>, <code>isprint_l</code>, <code>isgraph_l</code>—printable character predicates</h3>
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<a name="index-isprint"></a>
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<a name="index-isgraph"></a>
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<a name="index-isprint_005fl"></a>
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<a name="index-isgraph_005fl"></a>
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<p><strong>Synopsis</strong>
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</p><div class="example">
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<pre class="example">#include <ctype.h>
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int isprint(int <var>c</var>);
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int isgraph(int <var>c</var>);
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#include <ctype.h>
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int isprint_l(int <var>c</var>, locale_t <var>locale</var>);
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int isgraph_l(int <var>c</var>, locale_t <var>locale</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>isprint</code> is a macro which classifies singlebyte charset values by table
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lookup. It is a predicate returning non-zero for printable characters,
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and 0 for other character arguments. It is defined only if <var>c</var> is
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representable as an unsigned char or if <var>c</var> is EOF.
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</p>
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<p><code>isgraph</code> behaves identically to <code>isprint</code>, except that space characters
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are excluded.
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</p>
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<p><code>isprint_l</code>, <code>isgraph_l</code> are like <code>isprint</code>, <code>isgraph</code> but perform
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the check based on the locale specified by the locale object locale. If
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<var>locale</var> is LC_GLOBAL_LOCALE or not a valid locale object, the behaviour
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is undefined.
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</p>
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<p>You can use a compiled subroutine instead of the macro definition by
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undefining either macro using ‘<code>#undef isprint</code>’ or ‘<code>#undef isgraph</code>’,
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or ‘<code>#undef isprint_l</code>’ or ‘<code>#undef isgraph_l</code>’.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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<code>isprint</code>, <code>isprint_l</code> return non-zero if <var>c</var> is a printing character.
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<code>isgraph</code>, <code>isgraph_l</code> return non-zero if <var>c</var> is a printing character
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except spaces.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>isprint</code> and <code>isgraph</code> are ANSI C.
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</p>
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<p>No supporting OS subroutines are required.
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</p>
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<br>
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</body>
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</html>
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