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1 #include <string.h> | 1 #include <string.h> |
2 #include <stdint.h> | 2 #include <stdint.h> |
3 #include <limits.h> | 3 #include <limits.h> |
4 | 4 |
5 #define ALIGN (sizeof(size_t)) | 5 #define ALIGN (sizeof(size_t)) |
6 #define ONES ((size_t)-1/UCHAR_MAX) | 6 #define ONES ((size_t)-1 / UCHAR_MAX) |
7 #define HIGHS (ONES * (UCHAR_MAX/2+1)) | 7 #define HIGHS (ONES * (UCHAR_MAX / 2 + 1)) |
8 #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) | 8 #define HASZERO(x) ((x)-ONES & ~(x)&HIGHS) |
9 | 9 |
10 size_t strlen(const char *s) | 10 size_t strlen(const char* s) { |
11 { | 11 const char* a = s; |
12 » const char *a = s; | 12 const size_t* w; |
13 » const size_t *w; | 13 for (; (uintptr_t)s % ALIGN; s++) |
14 » for (; (uintptr_t)s % ALIGN; s++) if (!*s) return s-a; | 14 if (!*s) |
15 » for (w = (const void *)s; !HASZERO(*w); w++); | 15 return s - a; |
16 » for (s = (const void *)w; *s; s++); | 16 for (w = (const void*)s; !HASZERO(*w); w++) |
17 » return s-a; | 17 ; |
| 18 for (s = (const void*)w; *s; s++) |
| 19 ; |
| 20 return s - a; |
18 } | 21 } |
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