ref: b44a95b8fbe1a524074dfcb96ee5efb89c9a1c9a dir: /libc/src/isupper.c/
/* See LICENSE file for copyright and license details. */ #define __USE_MACROS #include <ctype.h> #undef isupper int isupper(int c) { return _ctype[(unsigned char) c] & _U; }