Prompt

edlin.asm

@@ -15,6 +15,7 @@ psp_fcb_1 equ 0x005c
 ; Syscall defines
 sys_print_char equ 2
 sys_print_string equ 9
+sys_read_line equ 0xa
 sys_open_file equ 0xf
 sys_delete_file equ 0x13
 sys_create_file equ 0x16
@@ -204,7 +205,7 @@ __0240:
 
 	mov byte [di], 0x1a ; ^Z
 	mov [__0a9a], di
-	mov byte [__0a9c], 0x80 ; magic
+	mov byte [input_buffer.size], input_buffer.bufend - input_buffer.bufstart
 	mov byte [__0c1e], 0xff ; magic
 	mov byte [__0d48], 0x0a ; magic
 	mov word [__0a92], disk_transfer_area
@@ -216,15 +217,19 @@ __0240:
 	call __0370
 
 __0273:
-db 0xBC, 0x48, 0x0D ; 0273 mov sp,0xd48
-db 0xB8, 0x23, 0x25 ; 0276 mov ax,0x2523
-db 0xBA, 0x2D, 0x09 ; 0279 mov dx,0x92d
-db 0xCD, 0x21 ; 027C int 0x21
-db 0xB0, 0x2A ; 027E mov al,0x2a
-db 0xE8, 0xA1, 0x06 ; 0280 call 0x924
-db 0xBA, 0x9C, 0x0A ; 0283 mov dx,0xa9c
-db 0xB4, 0x0A ; 0286 mov ah,0xa
-db 0xCD, 0x21 ; 0288 int 0x21
+	mov sp, stack.end
+	mov ax, sys_set_interrupt * 0x100 + int_ctrl_break
+	mov dx, ctrl_break_handler
+	int 0x21
+
+	print_prompt:
+		mov al, '*'
+		call print_char
+
+	mov dx, input_buffer
+	mov ah, sys_read_line
+	int 0x21
+
 db 0xB0, 0x0A ; 028A mov al,0xa
 db 0xE8, 0x95, 0x06 ; 028C call 0x924
 db 0xC7, 0x06, 0x82, 0x0A, 0x00, 0x00 ; 028F mov word [0xa82],0x0
@@ -1038,9 +1043,13 @@ __0a98: resw 1
 
 __0a9a: resw 1
 
-__0a9c: resb 1
+input_buffer:
+	.size: resb 1 ; 0a9c
+	.fill: resb 1; 0a9d
+	.bufstart: resb 128 ; 0a9e
+	.bufend: ; 0b1e
 
-resb 385
+resb 256
 
 __0c1e: resb 1