| #define _BSD_SOURCE |
| #include <string.h> |
| #include <stdint.h> |
| #include <limits.h> |
| |
| #define ALIGN (sizeof(size_t)-1) |
| #define ONES ((size_t)-1/UCHAR_MAX) |
| #define HIGHS (ONES * (UCHAR_MAX/2+1)) |
| #define HASZERO(x) ((x)-ONES & ~(x) & HIGHS) |
| |
| size_t strlcpy(char *d, const char *s, size_t n) |
| { |
| char *d0 = d; |
| size_t *wd; |
| |
| if (!n--) goto finish; |
| #ifdef __GNUC__ |
| typedef size_t __attribute__((__may_alias__)) word; |
| const word *ws; |
| if (((uintptr_t)s & ALIGN) == ((uintptr_t)d & ALIGN)) { |
| for (; ((uintptr_t)s & ALIGN) && n && (*d=*s); n--, s++, d++); |
| if (n && *s) { |
| wd=(void *)d; ws=(const void *)s; |
| for (; n>=sizeof(size_t) && !HASZERO(*ws); |
| n-=sizeof(size_t), ws++, wd++) *wd = *ws; |
| d=(void *)wd; s=(const void *)ws; |
| } |
| } |
| #endif |
| for (; n && (*d=*s); n--, s++, d++); |
| *d = 0; |
| finish: |
| return d-d0 + strlen(s); |
| } |