6
#define ALIGN (sizeof(size_t)-1)
7
#define ONES ((size_t)-1/UCHAR_MAX)
8
#define HIGHS (ONES * (UCHAR_MAX/2+1))
9
#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
11
void *memccpy(void *restrict dest, const void *restrict src, int c, size_t n)
13
unsigned char *d = dest;
14
const unsigned char *s = src;
19
if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) {
20
for (; ((uintptr_t)s & ALIGN) && n && (*d=*s)!=c; n--, s++, d++);
21
if ((uintptr_t)s & ALIGN) goto tail;
23
wd=(void *)d; ws=(const void *)s;
24
for (; n>=sizeof(size_t) && !HASZERO(*ws^k);
25
n-=sizeof(size_t), ws++, wd++) *wd = *ws;
26
d=(void *)wd; s=(const void *)ws;
28
for (; n && (*d=*s)!=c; n--, s++, d++);
30
if (*s==c) return d+1;