Until mainloop
This commit is contained in:
Juhani Krekelä
parent
21c3c59489
commit
2b301c62ec
277
edlin.asm
277
edlin.asm
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@ -13,12 +13,17 @@ psp_segment_size equ 0x0006
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psp_fcb_1 equ 0x005c
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; Syscall defines
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sys_print_char equ 2
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sys_print_string equ 9
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sys_open_file equ 0xf
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sys_delete_file equ 0x13
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sys_create_file equ 0x16
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sys_set_dta equ 0x1a
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sys_block_read equ 0x27
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sys_set_interrupt equ 0x25
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sys_random_block_read equ 0x27
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; Interrupt defines
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int_ctrl_break equ 0x23
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; Special instruction encodings
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%define r_ax 0
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@ -43,6 +48,9 @@ sys_block_read equ 0x27
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%macro addw 2
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db 0x03, 0xc0 + 8 * %1 + %2
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%endmacro
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%macro orw 2
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db 0x0b, 0xc0 + 8 * %1 + %2
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%endmacro
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%macro orb 2
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db 0x0a, 0xc0 + 8 * %1 + %2
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%endmacro
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@ -52,6 +60,9 @@ sys_block_read equ 0x27
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%macro xorw 2
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db 0x33, 0xc0 + 8 * %1 + %2
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%endmacro
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%macro cmpw 2
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db 0x3b, 0xc0 + 8 * %1 + %2
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%endmacro
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%macro movw 2
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db 0x8b, 0xc0 + 8 * %1 + %2
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%endmacro
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@ -183,24 +194,28 @@ setup_file_parameters: ; 01ec
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read_file:
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mov dx, psp_fcb_1
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mov ah, sys_block_read
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mov ah, sys_random_block_read
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int 0x21
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call find_file_end_char
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addw r_di, r_cx
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__0240:
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db 0xFC ; 0240 cld
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db 0xC6, 0x05, 0x1A ; 0241 mov byte [di],0x1a
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db 0x89, 0x3E, 0x9A, 0x0A ; 0244 mov [0xa9a],di
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db 0xC6, 0x06, 0x9C, 0x0A, 0x80 ; 0248 mov byte [0xa9c],0x80
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db 0xC6, 0x06, 0x1E, 0x0C, 0xFF ; 024D mov byte [0xc1e],0xff
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db 0xC6, 0x06, 0x48, 0x0D, 0x0A ; 0252 mov byte [0xd48],0xa
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db 0xC7, 0x06, 0x92, 0x0A, 0x49, 0x0D ; 0257 mov word [0xa92],0xd49
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db 0xC7, 0x06, 0x90, 0x0A, 0x01, 0x00 ; 025D mov word [0xa90],0x1
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db 0xC7, 0x06, 0x80, 0x0A, 0x01, 0x00 ; 0263 mov word [0xa80],0x1
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db 0xF6, 0x06, 0x7E, 0x0A, 0xFF ; 0269 test byte [0xa7e],0xff
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db 0x75, 0x03 ; 026E jnz 0x273
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db 0xE8, 0xFD, 0x00 ; 0270 call 0x370
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cld
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mov byte [di], 0x1a ; ^Z
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mov [__0a9a], di
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mov byte [__0a9c], 0x80 ; magic
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mov byte [__0c1e], 0xff ; magic
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mov byte [__0d48], 0x0a ; magic
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mov word [__0a92], disk_transfer_area
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mov word [__0a90], 1 ; magic
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mov word [__0a80], 1 ; magic
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test byte [new_file_flag], 0xff
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jnz __0273
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call __0370
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__0273:
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db 0xBC, 0x48, 0x0D ; 0273 mov sp,0xd48
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db 0xB8, 0x23, 0x25 ; 0276 mov ax,0x2523
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db 0xBA, 0x2D, 0x09 ; 0279 mov dx,0x92d
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@ -324,73 +339,101 @@ find_file_end_char: ; 035e
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sahf
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pop di
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.ret: ret
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__036d:
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jmp print_eof_str
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__0370:
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test byte [new_file_flag], 0xff
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jnz __036d
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mov dx, [__0a9a]
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cmp word [__0a80], 0
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jnz __0388
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cmp dx, [__0a96]
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jnc find_file_end_char.ret
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__0388:
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movw r_di, r_dx
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mov ah, sys_set_dta
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int 0x21
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mov cx, [__0a98]
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subw r_cx, r_dx
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jz _trampoline_oom_1
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mov dx, psp_fcb_1
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mov ah, sys_random_block_read
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int 0x21
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mov [new_file_flag], al
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push cx
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call find_file_end_char
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jne __03ab ; If the ^Z was not found
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mov byte [new_file_flag], 1 ; magic
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__03ab:
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xorw r_dx, r_dx
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mov bx, [__0a80]
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orw r_bx, r_bx
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jnz __03ca
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movw r_ax, r_di
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addw r_ax, r_cx
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cmp ax, [__0a96]
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jna __03ca ; disambiguate
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mov di, [__0a96]
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movw r_cx, r_ax
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subw r_cx, r_di
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mov bx, 1
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__03ca:
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call __04a4
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cmp [di - 1], al
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je __03de
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std
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dec di
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mov cx, [__0a98]
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repne scasb
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inc di
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inc di
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dec dx
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cld
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__03de:
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pop cx
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mov word [di], 0x1a ; ^Z
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subw r_cx, r_di
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xchg di, [__0a9a]
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addw r_di, r_cx
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sub [psp_fcb_1 + fcb_record_low], di
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sbb word [psp_fcb_1 + fcb_record_high], 0
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cmpw r_bx, r_dx
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jne __0406
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mov byte [new_file_flag], 0 ; magic
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ret
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db 0xE9, 0x8E, 0x00 ; 036D jmp 0x3fe
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db 0xF6, 0x06, 0x7E, 0x0A, 0xFF ; 0370 test byte [0xa7e],0xff
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db 0x75, 0xF6 ; 0375 jnz 0x36d
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db 0x8B, 0x16, 0x9A, 0x0A ; 0377 mov dx,[0xa9a]
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db 0x83, 0x3E, 0x80, 0x0A, 0x00 ; 037B cmp word [0xa80],byte +0x0
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db 0x75, 0x06 ; 0380 jnz 0x388
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db 0x3B, 0x16, 0x96, 0x0A ; 0382 cmp dx,[0xa96]
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db 0x73, 0xE4 ; 0386 jnc 0x36c
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db 0x8B, 0xFA ; 0388 mov di,dx
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db 0xB4, 0x1A ; 038A mov ah,0x1a
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db 0xCD, 0x21 ; 038C int 0x21
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db 0x8B, 0x0E, 0x98, 0x0A ; 038E mov cx,[0xa98]
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db 0x2B, 0xCA ; 0392 sub cx,dx
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db 0x74, 0x7E ; 0394 jz 0x414
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db 0xBA, 0x5C, 0x00 ; 0396 mov dx,0x5c
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db 0xB4, 0x27 ; 0399 mov ah,0x27
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db 0xCD, 0x21 ; 039B int 0x21
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db 0xA2, 0x7E, 0x0A ; 039D mov [0xa7e],al
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db 0x51 ; 03A0 push cx
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db 0xE8, 0xBA, 0xFF ; 03A1 call 0x35e
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db 0x75, 0x05 ; 03A4 jnz 0x3ab
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db 0xC6, 0x06, 0x7E, 0x0A, 0x01 ; 03A6 mov byte [0xa7e],0x1
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db 0x33, 0xD2 ; 03AB xor dx,dx
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db 0x8B, 0x1E, 0x80, 0x0A ; 03AD mov bx,[0xa80]
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db 0x0B, 0xDB ; 03B1 or bx,bx
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db 0x75, 0x15 ; 03B3 jnz 0x3ca
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db 0x8B, 0xC7 ; 03B5 mov ax,di
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db 0x03, 0xC1 ; 03B7 add ax,cx
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db 0x3B, 0x06, 0x96, 0x0A ; 03B9 cmp ax,[0xa96]
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db 0x76, 0x0B ; 03BD jna 0x3ca
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db 0x8B, 0x3E, 0x96, 0x0A ; 03BF mov di,[0xa96]
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db 0x8B, 0xC8 ; 03C3 mov cx,ax
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db 0x2B, 0xCF ; 03C5 sub cx,di
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db 0xBB, 0x01, 0x00 ; 03C7 mov bx,0x1
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db 0xE8, 0xD7, 0x00 ; 03CA call 0x4a4
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db 0x38, 0x45, 0xFF ; 03CD cmp [di-0x1],al
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db 0x74, 0x0C ; 03D0 jz 0x3de
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db 0xFD ; 03D2 std
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db 0x4F ; 03D3 dec di
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db 0x8B, 0x0E, 0x98, 0x0A ; 03D4 mov cx,[0xa98]
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db 0xF2, 0xAE ; 03D8 repne scasb
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db 0x47 ; 03DA inc di
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db 0x47 ; 03DB inc di
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db 0x4A ; 03DC dec dx
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db 0xFC ; 03DD cld
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db 0x59 ; 03DE pop cx
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db 0xC7, 0x05, 0x1A, 0x00 ; 03DF mov word [di],0x1a
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db 0x2B, 0xCF ; 03E3 sub cx,di
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db 0x87, 0x3E, 0x9A, 0x0A ; 03E5 xchg di,[0xa9a]
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db 0x03, 0xF9 ; 03E9 add di,cx
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db 0x29, 0x3E, 0x7D, 0x00 ; 03EB sub [0x7d],di
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db 0x83, 0x1E, 0x7F, 0x00, 0x00 ; 03EF sbb word [0x7f],byte +0x0
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db 0x3B, 0xDA ; 03F4 cmp bx,dx
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db 0x75, 0x0E ; 03F6 jnz 0x406
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db 0xC6, 0x06, 0x7E, 0x0A, 0x00 ; 03F8 mov byte [0xa7e],0x0
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db 0xC3 ; 03FD ret
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db 0xBA, 0x31, 0x0A ; 03FE mov dx,0xa31
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db 0xB4, 0x09 ; 0401 mov ah,0x9
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db 0xCD, 0x21 ; 0403 int 0x21
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db 0xC3 ; 0405 ret
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db 0xF6, 0x06, 0x7E, 0x0A, 0xFF ; 0406 test byte [0xa7e],0xff
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db 0x75, 0xF1 ; 040B jnz 0x3fe
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db 0xF6, 0x06, 0x7F, 0x0A, 0xFF ; 040D test byte [0xa7f],0xff
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db 0x75, 0xF1 ; 0412 jnz 0x405
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db 0xE9, 0xF5, 0x03 ; 0414 jmp 0x80c
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print_eof_str: ; 03fe
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mov dx, eof_str
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mov ah, sys_print_string
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int 0x21
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.ret: ret
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__0406:
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test byte [new_file_flag], 0xff
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jnz print_eof_str
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test byte [__0a7f], 0xff
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jnz print_eof_str.ret
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_trampoline_oom_1: ; 0414
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jmp oom
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db 0x8B, 0x1E, 0x80, 0x0A ; 0417 mov bx,[0xa80]
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db 0x0B, 0xDB ; 041B or bx,bx
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db 0x75, 0x1C ; 041D jnz 0x43b
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@ -450,6 +493,8 @@ db 0x3B, 0xDA ; 049A cmp bx,dx
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db 0x74, 0xD6 ; 049C jz 0x474
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db 0x8B, 0x0E, 0x9A, 0x0A ; 049E mov cx,[0xa9a]
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db 0x2B, 0xCF ; 04A2 sub cx,di
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__04a4:
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db 0xB0, 0x0A ; 04A4 mov al,0xa
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db 0x0A, 0xC0 ; 04A6 or al,al
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db 0xE3, 0xCA ; 04A8 jcxz 0x474
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@ -815,10 +860,13 @@ db 0x5F ; 0807 pop di
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db 0x5E ; 0808 pop si
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db 0xF3, 0xA4 ; 0809 rep movsb
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db 0xC3 ; 080B ret
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db 0xBA, 0xDD, 0x09 ; 080C mov dx,0x9dd
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db 0xB4, 0x09 ; 080F mov ah,0x9
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db 0xCD, 0x21 ; 0811 int 0x21
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db 0xE9, 0x5D, 0xFA ; 0813 jmp 0x273
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oom: ; 080c
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mov dx, oom_str
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mov ah, sys_print_string
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int 0x21
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jmp __0273
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db 0xB8, 0x23, 0x25 ; 0816 mov ax,0x2523
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db 0xBA, 0x7D, 0x08 ; 0819 mov dx,0x87d
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db 0xCD, 0x21 ; 081C int 0x21
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@ -927,23 +975,31 @@ db 0xF3, 0xA5 ; 0914 rep movsw
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db 0xBA, 0x58, 0x0A ; 0916 mov dx,0xa58
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db 0xCD, 0x21 ; 0919 int 0x21
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db 0xCD, 0x20 ; 091B int 0x20
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db 0xB0, 0x0D ; 091D mov al,0xd
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db 0xE8, 0x02, 0x00 ; 091F call 0x924
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db 0xB0, 0x0A ; 0922 mov al,0xa
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db 0x52 ; 0924 push dx
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db 0x92 ; 0925 xchg ax,dx
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db 0xB4, 0x02 ; 0926 mov ah,0x2
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db 0xCD, 0x21 ; 0928 int 0x21
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db 0x92 ; 092A xchg ax,dx
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db 0x5A ; 092B pop dx
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db 0xC3 ; 092C ret
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db 0x8C, 0xC8 ; 092D mov ax,cs
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db 0x8E, 0xD8 ; 092F mov ds,ax
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db 0x8E, 0xC0 ; 0931 mov es,ax
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db 0x8E, 0xD0 ; 0933 mov ss,ax
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db 0xBC, 0x48, 0x0D ; 0935 mov sp,0xd48
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db 0xE8, 0xE2, 0xFF ; 0938 call 0x91d
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db 0xE9, 0x35, 0xF9 ; 093B jmp 0x273
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newline: ; 091d
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mov al, 13 ; CR
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call print_char
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mov al, 10 ; LF
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print_char: ; 0924
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push dx
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xchg ax, dx
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mov ah, sys_print_char
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int 0x21
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xchg ax, dx
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pop dx
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ret
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ctrl_break_handler: ; 092d
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mov ax, cs
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mov ds, ax
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mov es, ax
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mov ss, ax
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mov sp, stack.end
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call newline
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jmp __0273
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bak_extension db "BAK" ; 093e
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@ -952,13 +1008,13 @@ filename_missing_error db "File name must be specified$" ; 095c
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bak_error db "Cannot edit .BAK file--rename file$" ; 0978
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directory_full_error db "No room in directory for file$" ; 099b
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__09b9 db "Disk full--file write not completed$"
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__09dd db 13, 10, "Insufficient memory", 13, 10, '$'
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oom_str db 13, 10, "Insufficient memory", 13, 10, '$' ; 09dd
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__09f5 db "Entry error", 13, 10, '$'
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new_file_str db "New file", 13, 10, '$' ; 0a03
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__0a0e db "Not found", 13, 10, '$'
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__0a1a db "O.K.? $"
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__0a21 db "Line too long", 13, 10, '$'
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__0a31 db "End of input file", 13, 10, '$'
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eof_str db "End of input file", 13, 10, '$' ; 0a31
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__0a45 db "Abort edit (Y/N)? $"
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; 0a58
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@ -971,17 +1027,28 @@ resb 1
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new_file_flag: resb 1 ; 0a7e
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__0a7f: resb 1
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resb 20
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__0a80: resw 1
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resb 14
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__0a90: resw 1
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__0a92: resw 1
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__0a94: resw 1
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__0a96: resw 1
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__0a98: resw 1
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resb 430
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__0a9a: resw 1
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__0a9c: resb 1
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resb 385
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__0c1e: resb 1
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resb 41
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stack: resb 256 ; 0c48
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.end: ; 0d48
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resb 1
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__0d48: resb 1
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disk_transfer_area: ; 0d49
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