| #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) |
| |
| char *__stpcpy(char *restrict d, const char *restrict s) |
| { |
| #ifdef __GNUC__ |
| typedef size_t __attribute__((__may_alias__)) word; |
| word *wd; |
| const word *ws; |
| if ((uintptr_t)s % ALIGN == (uintptr_t)d % ALIGN) { |
| for (; (uintptr_t)s % ALIGN; s++, d++) |
| if (!(*d=*s)) return d; |
| wd=(void *)d; ws=(const void *)s; |
| for (; !HASZERO(*ws); *wd++ = *ws++); |
| d=(void *)wd; s=(const void *)ws; |
| } |
| #endif |
| for (; (*d=*s); s++, d++); |
| |
| return d; |
| } |
| |
| weak_alias(__stpcpy, stpcpy); |