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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Bounds-checking integer arithmetic: GLib Reference Manual</title> <meta name="generator" content="DocBook XSL Stylesheets V1.79.1"> <link rel="home" href="index.html" title="GLib Reference Manual"> <link rel="up" href="glib-fundamentals.html" title="GLib Fundamentals"> <link rel="prev" href="glib-Byte-Order-Macros.html" title="Byte Order Macros"> <link rel="next" href="glib-Numerical-Definitions.html" title="Numerical Definitions"> <meta name="generator" content="GTK-Doc V1.32 (XML mode)"> <link rel="stylesheet" href="style.css" type="text/css"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" id="top" width="100%" summary="Navigation header" cellpadding="2" cellspacing="5"><tr valign="middle"> <td width="100%" align="left" class="shortcuts"> <a href="#" class="shortcut">Top</a><span id="nav_description"> <span class="dim">|</span> <a href="#glib-Bounds-checked-integer-arithmetic.description" class="shortcut">Description</a></span> </td> <td><a accesskey="h" href="index.html"><img src="home.png" width="16" height="16" border="0" alt="Home"></a></td> <td><a accesskey="u" href="glib-fundamentals.html"><img src="up.png" width="16" height="16" border="0" alt="Up"></a></td> <td><a accesskey="p" href="glib-Byte-Order-Macros.html"><img src="left.png" width="16" height="16" border="0" alt="Prev"></a></td> <td><a accesskey="n" href="glib-Numerical-Definitions.html"><img src="right.png" width="16" height="16" border="0" alt="Next"></a></td> </tr></table> <div class="refentry"> <a name="glib-Bounds-checked-integer-arithmetic"></a><div class="titlepage"></div> <div class="refnamediv"><table width="100%"><tr> <td valign="top"> <h2><span class="refentrytitle"><a name="glib-Bounds-checked-integer-arithmetic.top_of_page"></a>Bounds-checking integer arithmetic</span></h2> <p>Bounds-checking integer arithmetic — a set of helpers for performing checked integer arithmetic</p> </td> <td class="gallery_image" valign="top" align="right"></td> </tr></table></div> <div class="refsect1"> <a name="glib-Bounds-checked-integer-arithmetic.functions"></a><h2>Functions</h2> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="functions_proto_type"> <col class="functions_proto_name"> </colgroup> <tbody> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-uint-checked-add" title="g_uint_checked_add()">g_uint_checked_add</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-uint-checked-mul" title="g_uint_checked_mul()">g_uint_checked_mul</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-uint64-checked-add" title="g_uint64_checked_add()">g_uint64_checked_add</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-uint64-checked-mul" title="g_uint64_checked_mul()">g_uint64_checked_mul</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-size-checked-add" title="g_size_checked_add()">g_size_checked_add</a><span class="c_punctuation">()</span> </td> </tr> <tr> <td class="define_keyword">#define</td> <td class="function_name"> <a class="link" href="glib-Bounds-checked-integer-arithmetic.html#g-size-checked-mul" title="g_size_checked_mul()">g_size_checked_mul</a><span class="c_punctuation">()</span> </td> </tr> </tbody> </table></div> </div> <div class="refsect1"> <a name="glib-Bounds-checked-integer-arithmetic.includes"></a><h2>Includes</h2> <pre class="synopsis">#include <glib.h> </pre> </div> <div class="refsect1"> <a name="glib-Bounds-checked-integer-arithmetic.description"></a><h2>Description</h2> <p>GLib offers a set of macros for doing additions and multiplications of unsigned integers, with checks for overflows.</p> <p>The helpers all have three arguments. A pointer to the destination is always the first argument and the operands to the operation are the other two.</p> <p>Following standard GLib convention, the helpers return <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> in case of success (ie: no overflow).</p> <p>The helpers may be macros, normal functions or inlines. They may be implemented with inline assembly or compiler intrinsics where available.</p> </div> <div class="refsect1"> <a name="glib-Bounds-checked-integer-arithmetic.functions_details"></a><h2>Functions</h2> <div class="refsect2"> <a name="g-uint-checked-add"></a><h3>g_uint_checked_add()</h3> <pre class="programlisting">#define g_uint_checked_add(dest, a, b)</pre> <p>Performs a checked addition of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-uint-checked-add.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-uint-checked-add.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> <hr> <div class="refsect2"> <a name="g-uint-checked-mul"></a><h3>g_uint_checked_mul()</h3> <pre class="programlisting">#define g_uint_checked_mul(dest, a, b)</pre> <p>Performs a checked multiplication of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-uint-checked-mul.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint" title="guint"><span class="type">guint</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-uint-checked-mul.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> <hr> <div class="refsect2"> <a name="g-uint64-checked-add"></a><h3>g_uint64_checked_add()</h3> <pre class="programlisting">#define g_uint64_checked_add(dest, a, b)</pre> <p>Performs a checked addition of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-uint64-checked-add.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-uint64-checked-add.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> <hr> <div class="refsect2"> <a name="g-uint64-checked-mul"></a><h3>g_uint64_checked_mul()</h3> <pre class="programlisting">#define g_uint64_checked_mul(dest, a, b)</pre> <p>Performs a checked multiplication of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-uint64-checked-mul.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#guint64" title="guint64"><span class="type">guint64</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-uint64-checked-mul.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> <hr> <div class="refsect2"> <a name="g-size-checked-add"></a><h3>g_size_checked_add()</h3> <pre class="programlisting">#define g_size_checked_add(dest, a, b)</pre> <p>Performs a checked addition of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-size-checked-add.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-size-checked-add.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> <hr> <div class="refsect2"> <a name="g-size-checked-mul"></a><h3>g_size_checked_mul()</h3> <pre class="programlisting">#define g_size_checked_mul(dest, a, b)</pre> <p>Performs a checked multiplication of <em class="parameter"><code>a</code></em> and <em class="parameter"><code>b</code></em> , storing the result in <em class="parameter"><code>dest</code></em> .</p> <p>If the operation is successful, <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> is returned. If the operation overflows then the state of <em class="parameter"><code>dest</code></em> is undefined and <a class="link" href="glib-Standard-Macros.html#FALSE:CAPS" title="FALSE"><code class="literal">FALSE</code></a> is returned.</p> <div class="refsect3"> <a name="g-size-checked-mul.parameters"></a><h4>Parameters</h4> <div class="informaltable"><table class="informaltable" width="100%" border="0"> <colgroup> <col width="150px" class="parameters_name"> <col class="parameters_description"> <col width="200px" class="parameters_annotations"> </colgroup> <tbody> <tr> <td class="parameter_name"><p>dest</p></td> <td class="parameter_description"><p>a pointer to the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> destination</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>a</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> left operand</p></td> <td class="parameter_annotations"> </td> </tr> <tr> <td class="parameter_name"><p>b</p></td> <td class="parameter_description"><p>the <a class="link" href="glib-Basic-Types.html#gsize" title="gsize"><span class="type">gsize</span></a> right operand</p></td> <td class="parameter_annotations"> </td> </tr> </tbody> </table></div> </div> <div class="refsect3"> <a name="g-size-checked-mul.returns"></a><h4>Returns</h4> <p> <a class="link" href="glib-Standard-Macros.html#TRUE:CAPS" title="TRUE"><code class="literal">TRUE</code></a> if there was no overflow</p> </div> <p class="since">Since: <a class="link" href="api-index-2-48.html#api-index-2.48">2.48</a></p> </div> </div> </div> <div class="footer"> <hr>Generated by GTK-Doc V1.32</div> </body> </html>