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#include "memmove.h"
void *__rt_memmove(void *a, const void *b, size_t n)
/* copy memory taking care of overlap */
/* Relies on sizeof(int)=sizeof(void *) and byte addressing.
Also that memory does not wrap round for direction test. */
{
/* do it fast if word aligned ... */
if ((((int)a | (int)b | (int)n) & 3) == 0)
{ int *wa,*wb;
n >>= 2;
if (a < (void *)b)
for (wa = (int *)a, wb = (int *)b; n-- > 0;) *wa++ = *wb++;
else for (wa = n+(int *)a, wb = n+(int *)b; n-- > 0;) *--wa = *--wb;
}
else
{ char *ca,*cb;
if (a < (void *)b)
for (ca = (char *)a, cb = (char *)b; n-- > 0;) *ca++ = *cb++;
else for (ca = n+(char *)a, cb = n+(char *)b; n-- > 0;) *--ca = *--cb;
}
return a;
}
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