ref: 3e95097ce623d14228f5fe8f4206efe7d3490a9a 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; }