isascii
#define isascii(c) (((c) & ~0x7f) == 0) /* ASCII characters have bit 8 cleared */
isascii(char c)
#define isascii(c) 1
# define isascii(c) (!(c & 0200))
#undef isascii
isascii(int c)
void isascii() {}
void isascii() {}