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#include <stddef.h>
void *
__memmove (void *dst, const void *src, size_t n)
{
const char *s = src;
char *d = dst;
void *ret = dst;
size_t offset_src = ((size_t) s) & (sizeof(size_t) - 1);
size_t offset_dst = ((size_t) d) & (sizeof(size_t) - 1);
if (offset_src != offset_dst)
{
if (s < d)
{
// backward copying
d += n;
s += n;
while (n--)
*--d = *--s;
}
else
// forward copying
while (n--)
*d++ = *s++;
}
else
{
if (s < d)
{
offset_src = (offset_src + (size_t)src) & (sizeof(size_t) - 1);
// backward copying
d += n;
s += n;
while (n-- && offset_src--)
*--d = *--s;
n++;
if (!n) return ret;
void **d1 = (void **)d;
void **s1 = (void **)s;
while (n >= sizeof(void *))
{
n -= sizeof(void *);
*--d1 = *--s1;
}
s = (char *)s1;
d = (char *)d1;
while (n--)
*--d = *--s;
}
else
{
if (offset_src) offset_src = sizeof(size_t) - offset_src;
// forward copying
while (n-- && offset_src--)
*d++ = *s++;
n++;
if (!n) return ret;
void **d1 = (void **)d;
void **s1 = (void **)s;
while (n >= sizeof(void *))
{
n -= sizeof(void *);
*d1++ = *s1++;
}
s = (char *)s1;
d = (char *)d1;
while (n--)
*d++ = *s++;
}
}
return ret;
}
weak_alias (__memmove, __GI_memmove)
weak_alias (__memmove, memmove)
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