Loading...
#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); } |