1#include <string.h>
2#include <stdint.h>
3#include <limits.h>
4#include "libc.h"
5
6#define ALIGN (sizeof(size_t))
7#define ONES ((size_t)-1/UCHAR_MAX)
8#define HIGHS (ONES * (UCHAR_MAX/2+1))
9#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
10
11char *__stpcpy(char *restrict d, const char *restrict s)
12{
13	size_t *wd;
14	const size_t *ws;
15
16	if ((uintptr_t)s % ALIGN == (uintptr_t)d % ALIGN) {
17		for (; (uintptr_t)s % ALIGN; s++, d++)
18			if (!(*d=*s)) return d;
19		wd=(void *)d; ws=(const void *)s;
20		for (; !HASZERO(*ws); *wd++ = *ws++);
21		d=(void *)wd; s=(const void *)ws;
22	}
23	for (; (*d=*s); s++, d++);
24
25	return d;
26}
27
28weak_alias(__stpcpy, stpcpy);
29