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#include <ctype.h>
#include "limits.h"
#include "nonstd/assert.h"
#include "nonstd/ctype.h"
/** test whether a character is a control character */
int iscntrl(int c)
{
unsigned int *map = __libc(CTYPE);
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
return map[c] & CT_CNTRL;
}
/***
tests whether ARGUMENT(c) is a character in the class CHARACTER_CLASS(cntrl)
in the current locale.
***/
/*
RETURN(NONZERO, ARGUMENT(c) is a control character)
RETURN(0, ARGUMENT(c) is not a control character)
LC_CTYPE
STDC(1)
*/
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