🚀 go-pugleaf

The tan() function is actually in the libf.a and libe.a files.  It is
"bundled" with sin() and cos().  There is for sin() and cos() a small module
(like the one below) which then calls the appropriate entry point in the
real code.  After disassembling sin() and cos(), and then the low level
composite function, I put together the following assembly code hook for
tan().

*-------------------cut here-------------------------
* -*-save-*-
*
* fptan.s - missing tan hook
* Robert Heller. Created: Sun Nov 3, 1985 13:21:02.13
* Last Mod: 
* 
*
	.text
	.globl	_tan
_tan:
	link	A6,#-4
	movem.l	D3-D7,-(A7)
	move.l	8(A6),D7
	jsr	ffptan
	move.l	D7,D0
	movem.l	(A7)+,D3-D7
	unlk	A6
	rts
	.end
*-------------------cut here-----------------------

There is no sign of atan() and there is no math.h.  I got my version of 1.2
with my machine (a Stride), so the lack of math.h isn't particular to
TriSoft (nor is the lack of tan() and atan()).

				Robert Heller