ref: 994ab1e07787574e639eeb35e6da2a33a1e53bc2
dir: /libc/src/isalnum.c/
/* See LICENSE file for copyright and license details. */ #define __USE_MACROS #include <ctype.h> #undef isalnum int isalnum(int c) { return __ctype[(unsigned char) c] & (_U|_L|_D); }