ref: 4f219193c028b5e3b35d7317c2ead65b0f721b5e 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; }