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#include <ctype.h>
#include "limits.h"
#include "nonstd/assert.h"
/** test whether a character is alphabetic **/
int isalpha(int c)
{
ASSERT_REPRESENTABLE(c, 0, UCHAR_MAX, unsigned char, EOF);
/*
RETURN(NONZERO, ARGUMENT(c) is an alphabetic character)
RETURN(0, ARGUMENT(c) is not an alphabetic character)
*/
return islower(c) || isupper(c);
}
/***
tests whether ARGUMENT(c) is a character in the class
CHARACTER_CLASS(alpha) in the current locale.
***/
/*
LC_CTYPE
C_LOCALE(`THIS() is true for characters for which FUNCTION(isupper) or FUNCTION(islower) is true')
OTHER_LOCALES(`THIS is true for a set of characters for which none of FUNCTION(iscntrl), FUNCTION(isdigit), FUNCTION(ispunct), or FUNCTION(isspace) is true')
STDC(1)
*/
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