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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html><head>
<title>liboop: oop_malloc(), oop_free()</title>
<link rel="stylesheet" type="text/css" href="style.css">
</head><body>
<h2>oop_malloc(), oop_free()</h2>
<pre>
#include <oop.h>
extern void *(*oop_malloc)(size_t len); /* <em>Allocate memory.</em> */
extern void *(*oop_realloc<a href="#note-realloc">*</a>)(void *ptr,size_t len); /* <em>Resize memory.</em> */
extern void (*oop_free)(void *ptr); /* <em>Free allocated memory.</em> */
</pre>
<h3>Arguments.</h3>
<dl>
<dt><b>size_t len</b>
<dd>Size, in bytes, of the memory block to allocate.<p>
<dt><b>void *ptr</b>
<dd>Pointer to memory block to free or reallocate.<p>
</dl>
<h3>Description.</h3>
These are global function pointers, initialized by default to the standard C
library functions <em>malloc</em>, <em>realloc</em>, and <em>free</em>.
Applications using liboop may reset these pointers to allocation and
deallocation routines with a compatible interface; libraries should use
these function pointers wherever possible to allocate and release memory.
These pointers are normally set before calling any liboop code; if they
are changed during operation, the new <em>oop_free</em> and
<em>oop_realloc</em> functions should be
capable of handling memory obtained with the old <em>oop_malloc</em>.
<dl>
<dt><b>oop_malloc</b>
<dd>This function allocates a block of memory of size <em>len</em> and returns
a pointer to the start of the block. If allocation fails, NULL is returned.<p>
<dt><b>oop_realloc</b><a href="#note-realloc">*</a>
<dd>This function resizes a block of memory at <em>ptr</em> to have the new
length <em>len</em>. If <em>ptr</em> is NULL, fresh memory is allocated.
If <em>len</em> is zero, memory is freed and NULL is returned.
If <em>ptr</em> is NULL and <em>len</em> is zero, nothing is done and NULL
is returned. If reallocation fails, NULL is returned.<p>
<dt><b>oop_free</b>
<dd>This function releases a block of memory, designated by <em>ptr</em>,
previously allocated by <em>oop_malloc</em>. Once released, the memory may
be immediately overwritten, and/or reused by subsequent calls to
<em>oop_malloc</em>.
</dl>
<hr>
<p><a name="note-realloc">*</a> <b>Compatibility note:</b> oop_realloc
is only available in version 0.7 or newer.</p>
<hr><a href="ref.html">liboop reference</a></body></html>
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