isupper
__only_inline int isupper(int _c)
#undef isupper
isupper(int c)
#define isupper(c) ((c) >= 'A' && (c) <= 'Z')
#define isupper(c) ((c) >= 'A' && (c) <= 'Z')
#define isupper(c) ((c) >= 'A' && (c) <= 'Z')