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#ifndef _alloc_h_
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#define _alloc_h_
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#include <stddef.h> /* typedef size_t */
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extern void *xmalloc (size_t size);
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extern void *xrealloc (void *old, size_t new_size);
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extern void *xcalloc (size_t num_elems, size_t byte_size);
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#endif /* Not _alloc_h_ */
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