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Added handling for skipping non-renderable characters

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Added handling for backspace character
This commit is contained in:
Michal Isalski
2026-09-01 10:51:31 +02:00
parent 4b962a1f87
commit 9dfb8248a6
1 changed files with 19 additions and 5 deletions
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console.asm
+15 -1
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@@ -16,16 +16,30 @@ pub read_line:
je read_line_keyloop ; If the current key is same as previous, we loop
mov r4, r1 ; Storing current key as previous
cmp r1, 0x100
cmp r1, 0x100 ; Is the key down or up?
jbe read_line_keyloop ; If the key was up, we loop
xor r1, r1, 0x100 ; We remove the "down" bit
cmp r1, 10 ; Was the key Enter?
je read_line_finished ; If so, we're finished
cmp r1, 32 ; Was the key under Space? i.e. non-renderable
jb read_line_keyloop ; If so, we loop
cmp r1, 127 ; Was the key Backspace?
je read_line_backspace ; If yes we need to move one character back
read_line_store:
store_8 [r3], r1 ; Else, we store the key in the buffer
add r3, r3, 1 ; We advance forward
jmp read_line_keyloop
read_line_backspace:
cmp r3, r2
je read_line_keyloop ; If we are at the start, we loop
sub r3, r3, 1 ; We move back one character
jmp read_line_keyloop
read_line_finished:
store_8 [r3], zr ; We store null at the end so the string is finished
mov r1, r2 ; Recovering the buffer pointer