NAME
    ishash - whether a value is a hash state

SYNOPSIS
    ishash(x)

TYPES
    x		any

    return	integer

DESCRIPTION
    The value returned by ishash(x) is:

	0 if x is not a hash state,
	1 if x is a sha hash state,
	2 if x is a sha1 hash state,
	3 if x is a md5 hash state.

EXAMPLE
    > a = shs(0), b = shs1(0), c = md5(0)
    > print ishash(0), ishash(a), ishash(b), ishash(c);
    0 1 2 3

LIMITS
    none

LIBRARY
    none

SEE ALSO
    sha, sha1, md5,
    isassoc, isatty, isblk, isconfig, isdefined, iserror, iseven, isfile,
    isident, isint, islist, ismat, ismult, isnull, isnum, isobj,
    isobjtype, isodd, isprime, isrand, israndom, isreal, isrel,
    issimple, issq, isstr, istype