ref: b5b9eac2d984b1f67cd71c4547a3afd7f2bb6dd4
dir: /lib/c/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);
}