ref: 3801b0918d1ba3107283cb6087a9a158c33d545b dir: /libc/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; }