Initial file setup
This commit is contained in:
Juhani Krekelä
parent
6fa68e1fc1
commit
1383c6b59d
217
edlin.asm
217
edlin.asm
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@ -4,8 +4,12 @@ org 0x100
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; FCB defines
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fcb_filename equ 1
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fcb_extension equ fcb_filename + 8
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fcb_record_size equ 14
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fcb_record_low equ 33
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fcb_record_high equ 35
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; PSP defines
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psp_segment_size equ 0x0006
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psp_fcb_1 equ 0x005c
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; Syscall defined
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@ -13,10 +17,33 @@ 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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; Special instruction encodings
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%macro add_cx_ax 0
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db 0x03, 0xC8 ; add cx, ax (direction swapped)
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%endmacro
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%macro add_di_cx 0
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db 0x03, 0xF9 ; 023E add di, cx (direction swapped)
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%endmacro
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%macro or_al_al 0
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db 0x0a, 0xc0 ; or al, al (longer encoding)
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db 0x0a, 0xc0 ; or al, al (direction swapped)
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%endmacro
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%macro xor_ax_ax 0
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db 0x33, 0xc0 ; xor ax, ax (direction swapped)
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%endmacro
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%macro mov_ax_cx 0
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db 0x8b, 0xc1 ; mov ax, cx (direction swapped)
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%endmacro
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%macro mov_dx_cx 0
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db 0x8b, 0xD1 ; mov dx, cx (direction swapped)
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%endmacro
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%macro mov_di_dx 0
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db 0x8B, 0xfa ; mov di, dx (direction swapped)
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%endmacro
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%macro cmp_byteaddr_bytext 2
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@ -43,7 +70,7 @@ _trampoline_error_1:
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entrypoint: ; 0181
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mov byte [__0a7f], 0
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mov sp, stack_end
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mov sp, stack.end
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ensure_file_argument:
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cmp_byteaddr_bytext psp_fcb_1 + fcb_filename, ' '
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@ -58,72 +85,100 @@ ensure_file_argument:
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mov di, psp_fcb_1 + fcb_filename + 8
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mov cx, 3
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repe cmpsb
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je __01e6
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db 0xB4, 0x0F ; 01A4 mov ah,0xf
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db 0xBA, 0x5C, 0x00 ; 01A6 mov dx,0x5c
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db 0xCD, 0x21 ; 01A9 int 0x21
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db 0xA2, 0x7E, 0x0A ; 01AB mov [0xa7e],al
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db 0x0A, 0xC0 ; 01AE or al,al
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db 0x74, 0x07 ; 01B0 jz 0x1b9
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db 0xBA, 0x03, 0x0A ; 01B2 mov dx,0xa03
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db 0xB4, 0x09 ; 01B5 mov ah,0x9
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db 0xCD, 0x21 ; 01B7 int 0x21
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db 0xBE, 0x5C, 0x00 ; 01B9 mov si,0x5c
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db 0xBF, 0x58, 0x0A ; 01BC mov di,0xa58
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db 0xB9, 0x09, 0x00 ; 01BF mov cx,0x9
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db 0xF3, 0xA4 ; 01C2 rep movsb
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db 0xBE, 0x3E, 0x09 ; 01C4 mov si,0x93e
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db 0xA5 ; 01C7 movsw
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db 0xA4 ; 01C8 movsb
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db 0xB4, 0x13 ; 01C9 mov ah,0x13
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db 0xBA, 0x58, 0x0A ; 01CB mov dx,0xa58
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db 0xCD, 0x21 ; 01CE int 0x21
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db 0xB0, 0x24 ; 01D0 mov al,0x24
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db 0xBF, 0x61, 0x0A ; 01D2 mov di,0xa61
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db 0xAA ; 01D5 stosb
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db 0xAA ; 01D6 stosb
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db 0xAA ; 01D7 stosb
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db 0xB4, 0x16 ; 01D8 mov ah,0x16
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db 0xCD, 0x21 ; 01DA int 0x21
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db 0x0A, 0xC0 ; 01DC or al,al
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db 0x74, 0x0C ; 01DE jz 0x1ec
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db 0xBA, 0x9B, 0x09 ; 01E0 mov dx,0x99b
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db 0xE9, 0x96, 0x02 ; 01E3 jmp 0x47c
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je print_bak_error
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__01e6:
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db 0xBA, 0x78, 0x09 ; 01E6 mov dx,0x978
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db 0xE9, 0x90, 0x02 ; 01E9 jmp 0x47c
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db 0x33, 0xC0 ; 01EC xor ax,ax
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db 0xA3, 0x7D, 0x00 ; 01EE mov [0x7d],ax
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db 0xA3, 0x7F, 0x00 ; 01F1 mov [0x7f],ax
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db 0xA3, 0x79, 0x0A ; 01F4 mov [0xa79],ax
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db 0xA3, 0x7B, 0x0A ; 01F7 mov [0xa7b],ax
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db 0x40 ; 01FA inc ax
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db 0xA3, 0x6A, 0x00 ; 01FB mov [0x6a],ax
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db 0xA3, 0x66, 0x0A ; 01FE mov [0xa66],ax
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db 0xBA, 0x49, 0x0D ; 0201 mov dx,0xd49
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db 0x8B, 0xFA ; 0204 mov di,dx
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db 0xB4, 0x1A ; 0206 mov ah,0x1a
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db 0xCD, 0x21 ; 0208 int 0x21
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db 0x8B, 0x0E, 0x06, 0x00 ; 020A mov cx,[0x6]
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db 0x49 ; 020E dec cx
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db 0x89, 0x0E, 0x98, 0x0A ; 020F mov [0xa98],cx
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db 0xF6, 0x06, 0x7E, 0x0A, 0xFF ; 0213 test byte [0xa7e],0xff
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db 0x75, 0x26 ; 0218 jnz 0x240
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db 0x81, 0xE9, 0x49, 0x0D ; 021A sub cx,0xd49
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db 0xD1, 0xE9 ; 021E shr cx,1
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db 0x8B, 0xC1 ; 0220 mov ax,cx
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db 0xD1, 0xE9 ; 0222 shr cx,1
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db 0x89, 0x0E, 0x94, 0x0A ; 0224 mov [0xa94],cx
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db 0x03, 0xC8 ; 0228 add cx,ax
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db 0x8B, 0xD1 ; 022A mov dx,cx
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db 0x81, 0xC2, 0x49, 0x0D ; 022C add dx,0xd49
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db 0x89, 0x16, 0x96, 0x0A ; 0230 mov [0xa96],dx
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db 0xBA, 0x5C, 0x00 ; 0234 mov dx,0x5c
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db 0xB4, 0x27 ; 0237 mov ah,0x27
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db 0xCD, 0x21 ; 0239 int 0x21
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db 0xE8, 0x20, 0x01 ; 023B call 0x35e
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db 0x03, 0xF9 ; 023E add di,cx
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open_file:
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mov ah, sys_open_file
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mov dx, psp_fcb_1
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int 0x21
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mov [new_file_flag], al
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or_al_al
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jz delete_old_bak
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mov dx, new_file_str
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mov ah, sys_print_string
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int 0x21
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delete_old_bak: ; 01b9
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mov si, psp_fcb_1
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mov di, __0a58_fcb
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mov cx, 9
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rep movsb
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mov si, bak_extension
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movsw
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movsb
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mov ah, sys_delete_file
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mov dx, __0a58_fcb
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int 0x21
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; TODO: Why .$$$? What is this used for?
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mov al, '$'
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mov di, __0a58_fcb + fcb_extension
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stosb
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stosb
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stosb
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mov ah, sys_create_file
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int 0x21
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or_al_al
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jz setup_file_parameters
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mov dx, directory_full_error
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jmp error
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print_bak_error: ; 01e6
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mov dx, bak_error
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jmp error
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setup_file_parameters: ; 01ec
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xor_ax_ax
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mov [psp_fcb_1 + fcb_record_low], ax
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mov [psp_fcb_1 + fcb_record_high], ax
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mov [__0a58_fcb + fcb_record_low], ax
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mov [__0a58_fcb + fcb_record_high], ax
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inc ax
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mov [psp_fcb_1 + fcb_record_size], ax
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mov [__0a58_fcb + fcb_record_size], ax
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mov dx, disk_transfer_area
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mov_di_dx
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mov ah, sys_set_dta
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int 0x21
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mov cx, [psp_segment_size]
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dec cx
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mov [__0a98], cx
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test byte [new_file_flag], 0xff
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jnz __0240
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sub cx, disk_transfer_area
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; cx is now the amount of memory available starting at disk_transfer_area
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; __0a94 = ¼ available memory
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shr cx, 1
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mov_ax_cx
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shr cx, 1
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mov [__0a94], cx
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; __0a94 = ¾ available memory
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add_cx_ax
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mov_dx_cx
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add dx, disk_transfer_area
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mov [__0a96], dx
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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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int 0x21
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call __035e
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add_di_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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@ -243,7 +298,11 @@ db 0x05, 0x27, 0x06 ; 0355 add ax,0x627
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db 0x70, 0x03 ; 0358 jo 0x35d
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db 0x17 ; 035A pop ss
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db 0x04, 0xA6 ; 035B add al,0xa6
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db 0x08, 0x57, 0x51 ; 035D or [bx+0x51],dl
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db 0x08 ; 035D db 0x08
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__035e:
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db 0x57 ; 035E push di
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db 0x51 ; 035F push cx
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db 0xB0, 0x1A ; 0360 mov al,0x1a
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db 0xF2, 0xAE ; 0362 repne scasb
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db 0x8B, 0xF9 ; 0364 mov di,cx
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@ -890,13 +949,25 @@ __0a45 db "Abort edit (Y/N)? $"
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; 0a58
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section .bss
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__0a58:
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__0a58_fcb: resb 37 ; 0a58 … 0a7c
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resb 38
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; 0a7d
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resb 1
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__0a7e: resb 1
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new_file_flag: resb 1 ; 0a7e
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__0a7f: resb 1
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resb 712
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resb 20
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stack_end: ; 0d48
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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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stack: resb 256 ; 0c48
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.end: ; 0d48
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resb 1
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disk_transfer_area: ; 0d49
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