From fe51f65be393161da81d6db6144418c97a8e0fe7 Mon Sep 17 00:00:00 2001
From: user <user@clank>
Date: Thu, 16 Jul 2026 16:30:33 +0200
Subject: term/osk: scroll region so the OSK never hides the input line

The terminal now has a variable usable height (wTermRows). term_scroll and
cursor_down operate within [0 .. wTermRows-1], and term_set_rows(n) shrinks
or grows that region, scrolling the cursor up into view when it would fall
outside. osk_toggle shrinks the terminal to the rows above the keyboard on
show (18 - OSK_ROWS = 15) and restores full height on hide, so the active
line is always visible just above the docked keyboard, and hiding the OSK
reclaims all 18 rows.

Also add c/count.c ("count [n]", default 25): prints n numbered lines to
observe/debug scrolling and the scroll-region behavior. Registered as
program id 21 / bank 23. Fixed the arg to read argv[0] (getargs returns the
string after the command name).

Verified: filling the screen then opening the OSK scrolls the latest line
to row 14 (visible) with the keyboard at 15-17; closing it restores rows
15-17; count N prints exactly N lines.
---
 src/osk.asm | 5 +++++
 1 file changed, 5 insertions(+)

(limited to 'src/osk.asm')

diff --git a/src/osk.asm b/src/osk.asm
index c761aed..a34a863 100644
--- a/src/osk.asm
+++ b/src/osk.asm
@@ -236,6 +236,9 @@ osk_toggle::
     ld [wOskVisible], a
     or a
     jr z, .hide
+    ; show: shrink the terminal to the rows above the keyboard, then enable window
+    ld a, 18 - OSK_ROWS
+    call term_set_rows
     ld a, [rLCDC]
     or %00100000
     ld [rLCDC], a
@@ -244,6 +247,8 @@ osk_toggle::
     ld a, [rLCDC]
     and %11011111
     ld [rLCDC], a
+    ld a, 18                    ; restore full-height terminal
+    call term_set_rows
     ret
 
 ; movement with wrap-around; each moves the highlight
-- 
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