| #include <string.h> | |
| #include <stdint.h> | |
| #include <limits.h> | |
| #define ALIGN (sizeof(size_t)) | |
| #define ONES ((size_t)-1/UCHAR_MAX) | |
| #define HIGHS (ONES * (UCHAR_MAX/2+1)) | |
| #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) | |
| size_t strlen(const char *s) | |
| { | |
| const char *a = s; | |
| const size_t *w; | |
| for (; (uintptr_t)s % ALIGN; s++) if (!*s) return s-a; | |
| for (w = (const void *)s; !HASZERO(*w); w++); | |
| for (s = (const void *)w; *s; s++); | |
| return s-a; | |
| } |