13e12c5d1SDavid du Colombier #include <u.h>
23e12c5d1SDavid du Colombier #include <libc.h>
33e12c5d1SDavid du Colombier
43e12c5d1SDavid du Colombier void*
memmove(void * a1,void * a2,ulong n)53e12c5d1SDavid du Colombier memmove(void *a1, void *a2, ulong n)
63e12c5d1SDavid du Colombier {
73e12c5d1SDavid du Colombier char *s1, *s2;
83e12c5d1SDavid du Colombier
93e12c5d1SDavid du Colombier if((long)n < 0)
103e12c5d1SDavid du Colombier abort();
113e12c5d1SDavid du Colombier s1 = a1;
123e12c5d1SDavid du Colombier s2 = a2;
13*80ee5cbfSDavid du Colombier if((s2 < s1) && (s2+n > s1))
14*80ee5cbfSDavid du Colombier goto back;
153e12c5d1SDavid du Colombier while(n > 0) {
163e12c5d1SDavid du Colombier *s1++ = *s2++;
173e12c5d1SDavid du Colombier n--;
183e12c5d1SDavid du Colombier }
193e12c5d1SDavid du Colombier return a1;
203e12c5d1SDavid du Colombier
213e12c5d1SDavid du Colombier back:
22*80ee5cbfSDavid du Colombier s1 += n;
23*80ee5cbfSDavid du Colombier s2 += n;
243e12c5d1SDavid du Colombier while(n > 0) {
253e12c5d1SDavid du Colombier *--s1 = *--s2;
263e12c5d1SDavid du Colombier n--;
273e12c5d1SDavid du Colombier }
283e12c5d1SDavid du Colombier return a1;
293e12c5d1SDavid du Colombier }
303e12c5d1SDavid du Colombier
313e12c5d1SDavid du Colombier void*
memcpy(void * a1,void * a2,ulong n)323e12c5d1SDavid du Colombier memcpy(void *a1, void *a2, ulong n)
333e12c5d1SDavid du Colombier {
343e12c5d1SDavid du Colombier return memmove(a1, a2, n);
353e12c5d1SDavid du Colombier }
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