xenia/fox32rom
1
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

monitor: Don't allow backspacing past the start of the prompt

Browse Source
This commit is contained in:
Ry 2022-05-12 17:23:01 -07:00
parent 3247a29d2a
commit e38d1df807
1 changed files with 4 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
monitor/shell.asm
View File

@ -56,6 +56,10 @@ monitor_shell_key_down_event_enter:
call print_string_to_monitor call print_string_to_monitor
ret ret
monitor_shell_key_down_event_backspace: monitor_shell_key_down_event_backspace:
; check if we are already at the start of the prompt
mov r1, [MONITOR_SHELL_TEXT_BUF_PTR]
cmp r1, MONITOR_SHELL_TEXT_BUF_BOTTOM
iflteq ret
; delete the last character from the screen, and pop the last character from the buffer ; delete the last character from the screen, and pop the last character from the buffer
mov r0, 8 ; backspace character mov r0, 8 ; backspace character
call print_character_to_monitor call print_character_to_monitor