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To:	Sam Fans <sam-fans@hawkwind.utcs.toronto.edu>
Subject: scrollForwardR is buggy (+patch)
Date:	Sun, 18 Jul 1993 18:21:05 -0400
From:	Scott Schwartz <schwartz@groucho.cse.psu.edu>
Message-Id: <93Jul18.182024edt.2579@groucho.cse.psu.edu>

Greetings all,

In the Bell Labs distribution, if the X resource database contains
	Sam*scrollForwardR:false
then scrolling will malfunction.   As distributed, scrollForwardR works
by having samterm/main.c lie to scroll() about which button was
pressed, if it was 1 or 3.  Unfortunately, scroll() detects the lie at
line 122 when it calls button(but); it will always exit the loop at
that point since the real mouse won't match but.  My fix was to have
the scrolling logic in samterm check to see which is the
forward-scrolling button in the three places it needs to know that.

*** 1.1	1993/07/18 21:23:20
--- main.c	1993/07/18 22:00:31
***************
*** 21,26 ****
--- 21,28 ----
  char	lock = 1;
  char	hasunlocked = 0;
  
+ int	fwdbut = 3;		/* an X resource may set this to 1 */
+ 
  void
  main(int argc, char *argv[])
  {
***************
*** 29,36 ****
  	Rectangle r;
  	Flayer *nwhich;
  
- 	int fwdbut;
- 
  	getscreen(argc, argv);
  	fwdbut = scrollfwdbut();
  	iconinit();
--- 31,36 ----
***************
*** 81,87 ****
  					if(nwhich!=which)
  						current(nwhich);
  					else if(scr)
! 						scroll(which, fwdbut == 3 ? 1 : 3);
  					else{
  						t=(Text *)which->user1;
  						if(flselect(which)){
--- 81,87 ----
  					if(nwhich!=which)
  						current(nwhich);
  					else if(scr)
! 						scroll(which, 1);
  					else{
  						t=(Text *)which->user1;
  						if(flselect(which)){
***************
*** 98,104 ****
  					menu2hit();
  			}else if((mouse.buttons&4)){
  				if(scr)
! 					scroll(which, fwdbut == 3 ? 3 : 1);
  				else
  					menu3hit();
  			}
--- 98,104 ----
  					menu2hit();
  			}else if((mouse.buttons&4)){
  				if(scr)
! 					scroll(which, 3);
  				else
  					menu3hit();
  			}
***************
*** 287,302 ****
  {
  	Text *t=(Text *)l->user1;
  
! 	switch(but){
! 	case 1:
  		outTsll(Torigin, t->tag, l->origin, p0);
! 		break;
! 	case 2:
  		outTsll(Torigin, t->tag, p0, 1L);
! 		break;
! 	case 3:
  		horigin(t->tag,p0);
- 	}
  }
  
  int
--- 287,298 ----
  {
  	Text *t=(Text *)l->user1;
  
! 	if (but == BCKBUT)
  		outTsll(Torigin, t->tag, l->origin, p0);
! 	else if (but == SETBUT)
  		outTsll(Torigin, t->tag, p0, 1L);
! 	else if (but == FWDBUT)
  		horigin(t->tag,p0);
  }
  
  int
*** 1.1	1993/07/18 21:30:30
--- samterm.h	1993/07/18 22:00:33
***************
*** 5,10 ****
--- 5,14 ----
  #define	MAXFILES	256
  #define	NL	5
  
+ #define BCKBUT (4-fwdbut)
+ #define SETBUT (2)
+ #define FWDBUT (fwdbut)
+ 
  enum{
  	Up,
  	Down
***************
*** 67,72 ****
--- 71,77 ----
  extern long	snarflen;
  extern Mouse	mouse;
  extern long	modified;
+ extern int	fwdbut;
  
  Rune	*gettext(Flayer*, long, ulong*);
  void	*alloc(ulong n);
*** 1.1	1993/07/16 20:06:17
--- scroll.c	1993/07/18 22:05:39
***************
*** 100,114 ****
  				my = s.max.y;
  			if(!eqpt(mouse.xy, Pt(x, my)))
  				cursorset(Pt(x, my));
! 			if(but == 1){
  				p0 = l->origin-frcharofpt(&l->f, Pt(s.max.x, my));
  				rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
  				y = rt.min.y;
! 			}else if(but == 2){
  				y = my;
  				if(y > s.max.y-2)
  					y = s.max.y-2;
! 			}else if(but == 3){
  				p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
  				rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
  				y = rt.min.y;
--- 100,114 ----
  				my = s.max.y;
  			if(!eqpt(mouse.xy, Pt(x, my)))
  				cursorset(Pt(x, my));
! 			if(but == BCKBUT){
  				p0 = l->origin-frcharofpt(&l->f, Pt(s.max.x, my));
  				rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
  				y = rt.min.y;
! 			}else if(but == SETBUT){
  				y = my;
  				if(y > s.max.y-2)
  					y = s.max.y-2;
! 			}else if(but == FWDBUT){
  				p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
  				rt = scrpos(l->scroll, p0, p0+l->f.nchars, tot);
  				y = rt.min.y;
***************
*** 118,137 ****
  				r = raddp(scr, Pt(0, y-scr.min.y));
  				scrflip(l, r);
  			}
! 		}
  	}while(button(but));
  	if(in){
  		h = s.max.y-s.min.y;
  		scrflip(l, r);
  		p0 = 0;
! 		if(but == 1)
  			p0 = (long)(my-s.min.y)/l->f.font->height+1;
! 		else if(but == 2){
  			if(tot > 1024L*1024L)
  				p0 = ((tot>>10)*(y-s.min.y)/h)<<10;
  			else
  				p0 = tot*(y-s.min.y)/h;
! 		}else if(but == 3){
  			p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
  			if(p0 > tot)
  				p0 = tot;
--- 118,137 ----
  				r = raddp(scr, Pt(0, y-scr.min.y));
  				scrflip(l, r);
  			}
! 		}		
  	}while(button(but));
  	if(in){
  		h = s.max.y-s.min.y;
  		scrflip(l, r);
  		p0 = 0;
! 		if(but == BCKBUT)
  			p0 = (long)(my-s.min.y)/l->f.font->height+1;
! 		else if(but == SETBUT){
  			if(tot > 1024L*1024L)
  				p0 = ((tot>>10)*(y-s.min.y)/h)<<10;
  			else
  				p0 = tot*(y-s.min.y)/h;
! 		}else if(but == FWDBUT){
  			p0 = l->origin+frcharofpt(&l->f, Pt(s.max.x, my));
  			if(p0 > tot)
  				p0 = tot;