stpncpy
char *stpncpy(char *__restrict, const char *__restrict, size_t);
PROTO_NORMAL(stpncpy);
DEF_WEAK(stpncpy);
if (stpncpy(dst, src, 5) != dst + 5)
if (stpncpy(dst, src, 6) != dst + 6)
if (stpncpy(dst, src, 7) != dst + 6)
if (stpncpy(dst, src, 8) != dst + 6)