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@@ -0,0 +1,14 @@
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+/*
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+ malloc_usable_size - fully inspired by musl implementation
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+*/
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+
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+#include "malloc.h"
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+
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+/* for malloc_usable_size */
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+#define OVERHEAD (2*sizeof(size_t))
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+#define CHUNK_SIZE(c) ((c)->size & -2)
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+#define MEM_TO_CHUNK(p) (struct malloc_chunk *)((char *)(p) - OVERHEAD)
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+
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+size_t malloc_usable_size(void *p) {
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+ return p ? CHUNK_SIZE(MEM_TO_CHUNK(p)) - OVERHEAD : 0;
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+}
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