ref: ff07f46fcbf903b916be3f35063a5004bbb90daf dir: /lib/c/src/toupper.c/
/* See LICENSE file for copyright and license details. */ #define __USE_MACROS #include <ctype.h> #undef toupper int toupper(int c) { return (islower(c)) ? c & ~0x20 : c; }