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added answords.fs and strsignal.c
added checking of documenetation of ANS Forth words
Fixed many documentation errors and added some documentation
signal handling now uses strsignal and can handle signals not present on all machines

\ assertions

\ !! factor out line number printing, share with debugging.fs

variable assert-level ( -- a-addr ) \ gforth
\G all assertions above this level are turned off
1 assert-level !

: assertn ( n -- ) \ gforth assert-n
    \ this is internal (it is not immediate)
    assert-level @ >
    if
	POSTPONE (
    then ;

: assert0( ( -- ) \ gforth assert-zero
    \G important assertions that should always be turned on
    0 assertn ; immediate
: assert1( ( -- ) \ gforth assert-one
    \G normal assertions; turned on by default
    1 assertn ; immediate
: assert2( ( -- ) \ gforth assert-two
    \G debugging assertions
    2 assertn ; immediate
: assert3( ( -- ) \ gforth assert-three
    \G slow assertions that you may not want to turn on in normal debugging;
    \G you would turn them on mainly for thorough checking
    3 assertn ; immediate
: assert( ( -- ) \ gforth
    \G equivalent to assert1(
    POSTPONE assert1( ; immediate

: (endassert) ( flag -- ) \ gforth-internal
    \ three inline arguments
    if
	r> 3 cells + >r EXIT
    else
	r>
	dup 2@ type ." :" cell+ cell+
	@ 0 .r ." : failed assertion"
	true abort" assertion failed" \ !! or use a new throw code?
    then ;

: ) ( -- ) \ gforth	close-paren
    \G end an assertion
    POSTPONE (endassert) loadfilename 2@ 2, loadline @ , ; immediate