ref: 35d34bbbcae460ef8fbf579e090223ca22549b2d
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);
}