5 #define ALIGN (sizeof(size_t))
6 #define ONES ((size_t)-1/UCHAR_MAX)
7 #define HIGHS (ONES * (UCHAR_MAX/2+1))
8 #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS)
10 char *__strchrnul(const char *s, int c)
13 if (!c) return (char *)s + strlen(s);
16 typedef size_t __attribute__((__may_alias__)) word;
18 for (; (uintptr_t)s % ALIGN; s++)
19 if (!*s || *(unsigned char *)s == c) return (char *)s;
21 for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++);
24 for (; *s && *(unsigned char *)s != c; s++);
28 weak_alias(__strchrnul, strchrnul);