ref: 6ac2a90ca5853922ffe69559ea1a08df45f5f4d4
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);
}