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_cisize_t strlen(const char *s) 11570af302Sopenharmony_ci{ 12570af302Sopenharmony_ci const char *a = s; 13570af302Sopenharmony_ci#ifdef __GNUC__ 14570af302Sopenharmony_ci typedef size_t __attribute__((__may_alias__)) word; 15570af302Sopenharmony_ci const word *w; 16570af302Sopenharmony_ci for (; (uintptr_t)s % ALIGN; s++) if (!*s) return s-a; 17570af302Sopenharmony_ci for (w = (const void *)s; !HASZERO(*w); w++); 18570af302Sopenharmony_ci s = (const void *)w; 19570af302Sopenharmony_ci#endif 20570af302Sopenharmony_ci for (; *s; s++); 21570af302Sopenharmony_ci return s-a; 22570af302Sopenharmony_ci} 23