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/*

FUNCTION

	<>---alphabetic character predicate

INDEX

	isalpha

ANSI_SYNOPSIS

	#include 

	int isalpha(int <[c]>);

TRAD_SYNOPSIS

	#include 

	int isalpha(<[c]>);

DESCRIPTION

<> is a macro which classifies ASCII integer values by table

lookup.  It is a predicate returning non-zero when <[c]> represents an

alphabetic ASCII character, and 0 otherwise.  It is defined only if

<[c]> is representable as an unsigned char or if <[c]> is EOF.

You can use a compiled subroutine instead of the macro definition by

undefining the macro using `<<#undef isalpha>>'.

RETURNS

<> returns non-zero if <[c]> is a letter (<>--<> or

<>--<>).

PORTABILITY

<> is ANSI C.

No supporting OS subroutines are required.

*/

#include <_ansi.h>

#include 

#undef isalpha

int

_DEFUN(isalpha,(c),int c)

{

	return(__ctype_ptr__[c+1] & (_U|_L));

}