[src/trunk]: src/sys/dev/wscons provide (bug)compatibility with vga in WSDISP...

[macallan <macallan%NetBSD.org@localhost>]

details:   https://anonhg.NetBSD.org/src/rev/c37d0b0e1c87
branches:  trunk
changeset: 948364:c37d0b0e1c87
user:      macallan <macallan%NetBSD.org@localhost>
date:      Mon Dec 28 00:14:18 2020 +0000

description:
provide (bug)compatibility with vga in WSDISPLAYIO_{PUT|GET}WSCHAR
if row == 0 treat col as linear index into the text / attribute buffer,
transform into proper coordinates as needed for putchar()

with this wsmoused works as expected

diffstat:

 sys/dev/wscons/wsdisplay_vcons.c |  96 ++++++++++++++++++++++++---------------
 1 files changed, 58 insertions(+), 38 deletions(-)

diffs (132 lines):

diff -r ec1a8a2f2560 -r c37d0b0e1c87 sys/dev/wscons/wsdisplay_vcons.c
--- a/sys/dev/wscons/wsdisplay_vcons.c  Sun Dec 27 23:25:33 2020 +0000
+++ b/sys/dev/wscons/wsdisplay_vcons.c  Mon Dec 28 00:14:18 2020 +0000
@@ -1,4 +1,4 @@
-/*     $NetBSD: wsdisplay_vcons.c,v 1.43 2020/12/23 05:50:51 macallan Exp $ */
+/*     $NetBSD: wsdisplay_vcons.c,v 1.44 2020/12/28 00:14:18 macallan Exp $ */
 
 /*-
  * Copyright (c) 2005, 2006 Michael Lorenz
@@ -27,7 +27,7 @@
  */
 
 #include <sys/cdefs.h>
-__KERNEL_RCSID(0, "$NetBSD: wsdisplay_vcons.c,v 1.43 2020/12/23 05:50:51 macallan Exp $");
+__KERNEL_RCSID(0, "$NetBSD: wsdisplay_vcons.c,v 1.44 2020/12/28 00:14:18 macallan Exp $");
 
 #include <sys/param.h>
 #include <sys/systm.h>
@@ -1297,25 +1297,33 @@
 
        ri = &scr->scr_ri;
 
-       if (__predict_false((unsigned int)wsc->col > ri->ri_cols ||
-           (unsigned int)wsc->row > ri->ri_rows))
+       /* allow col as linear index if row == 0 */
+       if (wsc->row == 0) {
+               if (wsc->col < 0 || wsc->col > (ri->ri_cols * ri->ri_rows))
+                       return EINVAL;
+               int rem;
+               rem = wsc->col % ri->ri_cols;
+               wsc->row = wsc->col / ri->ri_cols;
+               DPRINTF("off %d -> %d, %d\n", wsc->col, rem, wsc->row);
+               wsc->col = rem;
+       } else {
+               if (__predict_false(wsc->col < 0 || wsc->col >= ri->ri_cols))
                        return (EINVAL);
        
-       if ((wsc->row >= 0) && (wsc->row < ri->ri_rows) && (wsc->col >= 0) && 
-            (wsc->col < ri->ri_cols)) {
+               if (__predict_false(wsc->row < 0 || wsc->row >= ri->ri_rows))
+                       return (EINVAL);
+       }
 
-               error = ri->ri_ops.allocattr(ri, wsc->foreground,
-                   wsc->background, wsc->flags, &attr);
-               if (error)
-                       return error;
-               vcons_putchar(ri, wsc->row, wsc->col, wsc->letter, attr);
+       error = ri->ri_ops.allocattr(ri, wsc->foreground,
+           wsc->background, wsc->flags, &attr);
+       if (error)
+               return error;
+       vcons_putchar(ri, wsc->row, wsc->col, wsc->letter, attr);
 #ifdef VCONS_DEBUG
-               printf("vcons_putwschar(%d, %d, %x, %lx\n", wsc->row, wsc->col,
-                   wsc->letter, attr);
+       printf("vcons_putwschar(%d, %d, %x, %lx\n", wsc->row, wsc->col,
+           wsc->letter, attr);
 #endif
-               return 0;
-       } else
-               return EINVAL;
+       return 0;
 }
 
 static int
@@ -1329,31 +1337,43 @@
 
        ri = &scr->scr_ri;
 
-       if ((wsc->row >= 0) && (wsc->row < ri->ri_rows) && (wsc->col >= 0) && 
-            (wsc->col < ri->ri_cols)) {
-
-               offset = ri->ri_cols * wsc->row + wsc->col;
-#ifdef WSDISPLAY_SCROLLSUPPORT
-               offset += scr->scr_offset_to_zero;
-#endif
-               wsc->letter = scr->scr_chars[offset];
-               attr = scr->scr_attrs[offset];
+       /* allow col as linear index if row == 0 */
+       if (wsc->row == 0) {
+               if (wsc->col < 0 || wsc->col > (ri->ri_cols * ri->ri_rows))
+                       return EINVAL;
+               int rem;
+               rem = wsc->col % ri->ri_cols;
+               wsc->row = wsc->col / ri->ri_cols;
+               DPRINTF("off %d -> %d, %d\n", wsc->col, rem, wsc->row);
+               wsc->col = rem;
+       } else {
+               if (__predict_false(wsc->col < 0 || wsc->col >= ri->ri_cols))
+                       return (EINVAL);
+       
+               if (__predict_false(wsc->row < 0 || wsc->row >= ri->ri_rows))
+                       return (EINVAL);
+       }
 
-               /* 
-                * this is ugly. We need to break up an attribute into colours and
-                * flags but there's no rasops method to do that so we must rely on
-                * the 'canonical' encoding.
-                */
+       offset = ri->ri_cols * wsc->row + wsc->col;
+#ifdef WSDISPLAY_SCROLLSUPPORT
+       offset += scr->scr_offset_to_zero;
+#endif
+       wsc->letter = scr->scr_chars[offset];
+       attr = scr->scr_attrs[offset];
+
+       /* 
+        * this is ugly. We need to break up an attribute into colours and
+        * flags but there's no rasops method to do that so we must rely on
+        * the 'canonical' encoding.
+        */
 #ifdef VCONS_DEBUG
-               printf("vcons_getwschar: %d, %d, %x, %lx\n", wsc->row,
-                   wsc->col, wsc->letter, attr);
+       printf("vcons_getwschar: %d, %d, %x, %lx\n", wsc->row,
+           wsc->col, wsc->letter, attr);
 #endif
-               wsc->foreground = (attr >> 24) & 0xff;
-               wsc->background = (attr >> 16) & 0xff;
-               wsc->flags      = attr & 0xff;
-               return 0;
-       } else
-               return EINVAL;
+       wsc->foreground = (attr >> 24) & 0xff;
+       wsc->background = (attr >> 16) & 0xff;
+       wsc->flags      = attr & 0xff;
+       return 0;
 }
 
 #ifdef WSDISPLAY_SCROLLSUPPORT