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100 lines
3.8 KiB
HTML
100 lines
3.8 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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<!-- Created by GNU Texinfo 6.4, http://www.gnu.org/software/texinfo/ -->
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<head>
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<title>atoi (The Red Hat newlib C Library)</title>
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<meta name="description" content="atoi (The Red Hat newlib C Library)">
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<meta name="keywords" content="atoi (The Red Hat newlib C Library)">
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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="Stdlib.html#Stdlib" rel="up" title="Stdlib">
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<link href="atoll.html#atoll" rel="next" title="atoll">
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</head>
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<body lang="en">
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<a name="atoi"></a>
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<div class="header">
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<p>
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Next: <a href="atoll.html#atoll" accesskey="n" rel="next">atoll</a>, Previous: <a href="atof.html#atof" accesskey="p" rel="prev">atof</a>, Up: <a href="Stdlib.html#Stdlib" accesskey="u" rel="up">Stdlib</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="atoi_002c-atol_002d_002d_002dstring-to-integer"></a>
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<h3 class="section">2.8 <code>atoi</code>, <code>atol</code>—string to integer</h3>
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<a name="index-atoi"></a>
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<a name="index-atol"></a>
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<a name="index-_005fatoi_005fr"></a>
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<a name="index-_005fatol_005fr"></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 <stdlib.h>
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int atoi(const char *<var>s</var>);
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long atol(const char *<var>s</var>);
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int _atoi_r(struct _reent *<var>ptr</var>, const char *<var>s</var>);
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long _atol_r(struct _reent *<var>ptr</var>, const char *<var>s</var>);
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</pre></div>
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<p><strong>Description</strong><br>
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<code>atoi</code> converts the initial portion of a string to an <code>int</code>.
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<code>atol</code> converts the initial portion of a string to a <code>long</code>.
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</p>
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<p><code>atoi(s)</code> is implemented as <code>(int)strtol(s, NULL, 10).</code>
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<code>atol(s)</code> is implemented as <code>strtol(s, NULL, 10).</code>
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</p>
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<p><code>_atoi_r</code> and <code>_atol_r</code> are reentrant versions of <code>atoi</code> and
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<code>atol</code> respectively, passing the reentrancy struct pointer.
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</p>
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<br>
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<p><strong>Returns</strong><br>
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The functions return the converted value, if any. If no conversion was
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made, <code>0</code> is returned.
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</p>
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<br>
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<p><strong>Portability</strong><br>
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<code>atoi</code>, <code>atol</code> are ANSI.
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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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