1570af302Sopenharmony_ci#include <string.h> 2570af302Sopenharmony_ci#include <stdint.h> 3570af302Sopenharmony_ci#include <limits.h> 4570af302Sopenharmony_ci 5570af302Sopenharmony_ci#define ALIGN (sizeof(size_t)) 6570af302Sopenharmony_ci#define ONES ((size_t)-1/UCHAR_MAX) 7570af302Sopenharmony_ci#define HIGHS (ONES * (UCHAR_MAX/2+1)) 8570af302Sopenharmony_ci#define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) 9570af302Sopenharmony_ci 10570af302Sopenharmony_cichar *__strchrnul(const char *s, int c) 11570af302Sopenharmony_ci{ 12570af302Sopenharmony_ci c = (unsigned char)c; 13570af302Sopenharmony_ci if (!c) return (char *)s + strlen(s); 14570af302Sopenharmony_ci 15570af302Sopenharmony_ci#ifdef __GNUC__ 16570af302Sopenharmony_ci typedef size_t __attribute__((__may_alias__)) word; 17570af302Sopenharmony_ci const word *w; 18570af302Sopenharmony_ci for (; (uintptr_t)s % ALIGN; s++) 19570af302Sopenharmony_ci if (!*s || *(unsigned char *)s == c) return (char *)s; 20570af302Sopenharmony_ci size_t k = ONES * c; 21570af302Sopenharmony_ci for (w = (void *)s; !HASZERO(*w) && !HASZERO(*w^k); w++); 22570af302Sopenharmony_ci s = (void *)w; 23570af302Sopenharmony_ci#endif 24570af302Sopenharmony_ci for (; *s && *(unsigned char *)s != c; s++); 25570af302Sopenharmony_ci return (char *)s; 26570af302Sopenharmony_ci} 27570af302Sopenharmony_ci 28570af302Sopenharmony_ciweak_alias(__strchrnul, strchrnul); 29