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#include <string.h>
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void*
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memmove(void *a1, const void *a2, size_t n)
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{
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	char *s1, *s2;
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	extern void abort(void);
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	if((long)n < 0)
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		abort();
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	if(a1 > a2)
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		goto back;
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	s1 = a1;
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	s2 = a2;
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	while(n > 0) {
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		*s1++ = *s2++;
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		n--;
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	}
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	return a1;
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back:
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	s1 = (char*)a1 + n;
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	s2 = (char*)a2 + n;
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	while(n > 0) {
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		*--s1 = *--s2;
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		n--;
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	}
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	return a1;
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}
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void*
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memcpy(void *a1, const void *a2, size_t n)
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{
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	return memmove(a1, a2, n);
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}