StringPtr PStrNCat (StringPtr dst, ConstStr255Param src,UInt32 max);
char *CStrNCat (char *dst, const char *src, UInt32 max);
PStrNCat appends up to max characters from src to dst Pascal strings. CStrNCat appends up to max characters from src to dst C strings. The initial character of src overwrites the null character at the end of dst. A terminating null character is always appended. Thus, the maximum length of dst could be CStrLen ( dst )+ max +1.