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#include <ctype.h>
#include <limits.h>
#include <stdio.h>
#include "_assert.h"
/** test whether a character is alphanumeric **/
int isalnum(int c)
{
SIGNAL_SAFE(0);
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
return isalpha(c) || isdigit(c);
}
/***
tests whether ARGUMENT(c) is a character in the class
CHARACTER_CLASS(alpha) or CHARACTER_CLASS(digit) in the current locale.
***/
/*
RETURN(NONZERO, ARGUMENT(c) is an alpanumeric character)
RETURN(0, ARGUMENT(c) is not an alphanumeric character)
LC_CTYPE
STDC(1)
*/
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