ref: a420fdf054d2a3b4bdbc79e1fc9b200463e2554a
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);
}