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| 3 | magnus | 1 | <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> |
| 2 | <html><head> |
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| 3 | <title>liboop: oop_malloc(), oop_free()</title> |
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| 4 | <link rel="stylesheet" type="text/css" href="style.css"> |
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| 5 | </head><body> |
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| 6 | |||
| 7 | <h2>oop_malloc(), oop_free()</h2> |
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| 8 | |||
| 9 | <pre> |
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| 10 | #include <oop.h> |
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| 11 | |||
| 12 | extern void *(*oop_malloc)(size_t len); /* <em>Allocate memory.</em> */ |
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| 13 | extern void *(*oop_realloc<a href="#note-realloc">*</a>)(void *ptr,size_t len); /* <em>Resize memory.</em> */ |
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| 14 | extern void (*oop_free)(void *ptr); /* <em>Free allocated memory.</em> */ |
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| 15 | </pre> |
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| 16 | |||
| 17 | <h3>Arguments.</h3> |
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| 18 | |||
| 19 | <dl> |
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| 20 | <dt><b>size_t len</b> |
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| 21 | <dd>Size, in bytes, of the memory block to allocate.<p> |
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| 22 | |||
| 23 | <dt><b>void *ptr</b> |
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| 24 | <dd>Pointer to memory block to free or reallocate.<p> |
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| 25 | </dl> |
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| 26 | |||
| 27 | <h3>Description.</h3> |
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| 28 | |||
| 29 | These are global function pointers, initialized by default to the standard C |
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| 30 | library functions <em>malloc</em>, <em>realloc</em>, and <em>free</em>. |
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| 31 | Applications using liboop may reset these pointers to allocation and |
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| 32 | deallocation routines with a compatible interface; libraries should use |
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| 33 | these function pointers wherever possible to allocate and release memory. |
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| 34 | These pointers are normally set before calling any liboop code; if they |
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| 35 | are changed during operation, the new <em>oop_free</em> and |
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| 36 | <em>oop_realloc</em> functions should be |
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| 37 | capable of handling memory obtained with the old <em>oop_malloc</em>. |
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| 38 | |||
| 39 | <dl> |
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| 40 | <dt><b>oop_malloc</b> |
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| 41 | <dd>This function allocates a block of memory of size <em>len</em> and returns |
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| 42 | a pointer to the start of the block. If allocation fails, NULL is returned.<p> |
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| 43 | |||
| 44 | <dt><b>oop_realloc</b><a href="#note-realloc">*</a> |
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| 45 | <dd>This function resizes a block of memory at <em>ptr</em> to have the new |
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| 46 | length <em>len</em>. If <em>ptr</em> is NULL, fresh memory is allocated. |
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| 47 | If <em>len</em> is zero, memory is freed and NULL is returned. |
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| 48 | If <em>ptr</em> is NULL and <em>len</em> is zero, nothing is done and NULL |
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| 49 | is returned. If reallocation fails, NULL is returned.<p> |
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| 50 | |||
| 51 | <dt><b>oop_free</b> |
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| 52 | <dd>This function releases a block of memory, designated by <em>ptr</em>, |
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| 53 | previously allocated by <em>oop_malloc</em>. Once released, the memory may |
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| 54 | be immediately overwritten, and/or reused by subsequent calls to |
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| 55 | <em>oop_malloc</em>. |
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| 56 | </dl> |
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| 57 | |||
| 58 | <hr> |
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| 59 | <p><a name="note-realloc">*</a> <b>Compatibility note:</b> oop_realloc |
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| 60 | is only available in version 0.7 or newer.</p> |
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| 61 | |||
| 62 | <hr><a href="ref">liboop reference</a></body></html> |