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Added storing shift status

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Michał Isalski
2026-09-02 02:03:00 +02:00
parent 65caf8aff9
commit f9bb69f1f5
1 changed files with 25 additions and 15 deletions
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console.asm
+25 -15
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@@ -4,9 +4,10 @@
; r1 - pointer to the buffer
; Result:
; r1 - pointer to the same buffer
; Clobbers: r2, r3, r4
; Clobbers: r2, r3, r4, r5
pub read_line:
mov r4, 0 ; Storing the last key here, so we don't repeat the same key
mov r5, 0 ; Storing the shift status
mov r3, r1 ; The pointer to after the last character
read_line_keyloop:
@@ -16,23 +17,32 @@ pub read_line:
je read_line_keyloop ; If the current key is same as previous, we loop
mov r4, r2 ; Storing current key as previous
cmp r2, 0x100 ; Is the key down or up?
jbe read_line_keyloop ; If the key was up, we loop
xor r2, r2, 0x100 ; We remove the "down" bit
cmp r2, 10 ; Was the key Enter?
je read_line_finished ; If so, we're finished
cmp r2, 0x120 ; Is the key renderable or special?
jb read_line_special ; If the key was special, we handle it separately
cmp r2, 32 ; Was the key under Space? i.e. non-renderable
jb read_line_keyloop ; If so, we loop
; TODO: Converting based on shift value
store_8 [r3], r2 ; Else, we store the key in the buffer
add r3, r3, 1 ; We advance forward
jmp read_line_keyloop
cmp r2, 127 ; Was the key Backspace?
je read_line_backspace ; If yes we need to move one character back
read_line_special:
cmp r2, 13 ; Was the key Backspace?
je read_line_backspace ; If yes we need to move one character back
read_line_store:
store_8 [r3], r2 ; Else, we store the key in the buffer
add r3, r3, 1 ; We advance forward
jmp read_line_keyloop
cmp r2, 10 ; Was the key Enter?
je read_line_finished ; If so, we're finished
and r2, r2, 0x1FB ; Mask out the left/right shift direction bit
cmp r2, 0x110 ; Was the key Shift Down?
and flags, flags, 0x1 ; We care only about equality bit
or r5, r5, flags ; If shift was down before, it still is. If it was pressed now, it is down now
cmp r2, 0x010 ; Was the key Shift Up?
and flags, flags, 0x1 ; We care only about equality bit
xor flags, flags, 0x1 ; We invert it, i.e. "if it's not up"
and r5, r5, flags ; The shift can be kept down if it's not currently up
jmp read_line_keyloop ; If no special handling, we loop back
read_line_backspace:
cmp r3, r1 ; Compare the current pointer to start of buffer