diff options
Diffstat (limited to 'terminal.asm')
| -rw-r--r-- | terminal.asm | 32 |
1 files changed, 22 insertions, 10 deletions
diff --git a/terminal.asm b/terminal.asm index 0de17e9..ddf27fc 100644 --- a/terminal.asm +++ b/terminal.asm @@ -1,28 +1,34 @@ %ifndef _TERMINAL_ASM %define _TERMINAL_ASM -T_BUFSZ equ 256 ; maximum length of terminal input buffer +T_BUFSZ equ 255 ; maximum length of terminal input buffer terminal: push bp mov bp, sp + push ds + push es mov ax, ds mov es, ax sub sp, T_BUFSZ ; reserve space for tokens - xor ax, ax - mov cx, T_BUFSZ - lea di, [bp - T_BUFSZ] - repne stosb ; zero out token storage + cld .clear_buffer: - mov cx, T_BUFSZ ; counter is length of buffer + xor ax, ax + mov cx, T_BUFSZ / 2 + lea di, [bp - T_BUFSZ] + mov dx, di + repne stosb ; zero out token storage + + xor ax, ax + mov cx, T_BUFSZ / 2 ; counter is length of buffer mov di, t_buffer ; destination is buffer - rep stosb ; zero buffer + repne stosw ; zero buffer .do_prompt: - mov cx, 0 ; reset counter + xor cx, cx ; reset counter ; this tracks keyboard presses mov al, ASCII_CR call putc ; write carriage return to console @@ -60,12 +66,16 @@ terminal: ; a command parser will be here eventually ; TODO: write string tokenizer - lea si, [bp - T_BUFSZ] push ' ' - push si + push dx push t_buffer call strtok add sp, 2 * 3 + + push word ax + call printh + add sp, 2 + ;push t_buffer ; push buffer string address ;push t_buffer_fmt ; push buffer format string address ;call printf ; write input to console @@ -80,6 +90,8 @@ terminal: jmp .do_prompt ; start over + pop es + pop ds mov sp, bp pop bp ret |