ref: 24df403e7e688d13b5c5c29ca5a9fa6c6b2499df dir: /libc/src/tolower.c/
/* See LICENSE file for copyright and license details. */ #define __USE_MACROS #include <ctype.h> int tolower(int c) { return (isupper(c)) ? c & ~0x20 : c; }