isalpha
#undef isalpha
#define isalpha(c) _bcs_isalpha(c)
#undef isalpha
#define isalpha(c) _bcs_isalpha(c)
#define isalpha(c) (((c) >= 'a') && ((c) <= 'z'))
#define isalpha(c) (((c) >= 'a') && ((c) <= 'z'))
isalpha(int ch)
#define isalpha(x) (('A' <= (x) && (x) <= 'Z') || ('a' <= (x) && (x) <= 'z'))
#define isalpha(c) ((int)((_ctype_tab_ + 1)[(c)] & _CTYPE_A))