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 *__strchrnul(const char *s, int c) 12{ 13 size_t *w, k; 14 15 c = (unsigned char)c; 16 if (!c) return (char *)s + strlen(s); 17 18 for (; (uintptr_t)s % ALIGN; s++) 19 if (!*s || *(unsigned char *)s == c) return (char *)s; 20 k = ONES * c; 21 for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++); 22 for (s = (void *)w; *s && *(unsigned char *)s != c; s++); 23 return (char *)s; 24} 25 26weak_alias(__strchrnul, strchrnul); 27