Bitwise and and or

I'm currently trying to do some bitwise arithmetic at V5R1.  Something
along these lines:

ALIGN_MASK       c                 x'C000'
ALIGN_LEFT       c                 x'8000'
ALIGN_RIGHT      c                 x'4000'
ALIGN_CENTER     c                 x'C000'

Now, I want to check a variable called "flags".  In Java, it's pretty
easy:

  if ((flags & ALIGN_MASK) == ALIGN_LEFT)

And in later versions of RPG, I can use the %BITAND BIF.  For V5R1, what
do you all suggest?  I can do something close using BITOFF, but for
anything more than one byte (8 bits) it's a lot of work.

Is there perhaps a C function that ANDs two values?  I'm just fishing
here so I don't have to write my own test routines.

Joe