text: 
  /*
  FUNCTION
  <<islower>>---lowercase character predicate
  
  INDEX
  islower
  
  ANSI_SYNOPSIS
  #include <ctype.h>
  int islower(int <[c]>);
  
  TRAD_SYNOPSIS
  #include <ctype.h>
  int islower(<[c]>);
  
  DESCRIPTION
  <<islower>> is a macro which classifies ASCII integer values by table
  lookup.  It is a predicate returning non-zero for minuscules
  (lowercase alphabetic characters), and 0 for other characters.
  It is defined only when <<isascii>>(<[c]>) is true or <[c]> is EOF.
  
  You can use a compiled subroutine instead of the macro definition by
  undefining the macro using `<<#undef islower>>'.
  
  RETURNS
  <<islower>> returns non-zero if <[c]> is a lowercase letter (<<a>>--<<z>>).
  
  PORTABILITY
  <<islower>> is ANSI C.
  
  No supporting OS subroutines are required.
  */
  #include <_ansi.h>
  #include <ctype.h>
  
  #undef islower
  int
  _DEFUN(islower,(c),int c)
  {
  	return((_ctype_ + 1)[c] & _L);
  }
  
  