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