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monitor: Very basic argument parsing

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Ry 2022-04-23 22:33:15 -07:00
parent c078c2b917
commit ae3d24922b
1 changed files with 43 additions and 1 deletions
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44
monitor/shell.asm
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@ -74,6 +74,47 @@ monitor_shell_key_up_event:
ret
monitor_shell_parse_line:
; if the line is empty, just return
cmp.8 [MONITOR_SHELL_TEXT_BUF_BOTTOM], 0
ifz ret
; separate the command from the arguments
; store the pointer to the arguments
mov r0, MONITOR_SHELL_TEXT_BUF_BOTTOM
mov r1, ' '
call monitor_shell_tokenize
mov [MONTIOR_SHELL_ARGS_PTR], r0
mov r0, MONITOR_SHELL_TEXT_BUF_BOTTOM
mov r1, test_string
call compare_string
ifz mov r0, test_working
ifz call print_string_to_monitor
ret
test_string: data.str "test" data.8 0
test_working: data.str "it's working!!!" data.8 10 data.8 0
; return tokens separated by the specified character
; returns the next token in the list
; inputs:
; r0: pointer to null-terminated string
; r1: separator character
; outputs:
; r0: pointer to next token or zero if none
monitor_shell_tokenize:
cmp.8 [r0], r1
ifz jmp monitor_shell_tokenize_found_token
cmp.8 [r0], 0
ifz mov r0, 0
ifz ret
inc r0
jmp monitor_shell_tokenize
monitor_shell_tokenize_found_token:
mov.8 [r0], 0
inc r0
ret
; push a character to the text buffer
@ -131,6 +172,7 @@ monitor_shell_clear_buffer:
const MONITOR_SHELL_TEXT_BUF_TOP: 0x03ED4000
const MONITOR_SHELL_TEXT_BUF_BOTTOM: 0x03ED3FE0 ; 32 characters
const MONITOR_SHELL_TEXT_BUF_PTR: 0x03ED3FDC ; 4 bytes
const MONITOR_SHELL_TEXT_BUF_PTR: 0x03ED3FDC ; 4 bytes - pointer to the current input character
const MONTIOR_SHELL_ARGS_PTR: 0x03ED36C5 ; 4 bytes - pointer to the beginning of the command arguments
monitor_shell_prompt: data.str "> " data.8 0