Line specifier handling
This commit is contained in:
Juhani Krekelä
parent
137effd1c1
commit
0d9c29618f
185
edlin.asm
185
edlin.asm
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@ -68,11 +68,16 @@ int_ctrl_break equ 0x23
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db 0x8b, 0xc0 + 8 * %1 + %2
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%endmacro
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%macro cmp_byteaddr_bytext 2
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; Sign extended byte to byte
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%macro cmpb_addr_ext 2
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db 0x82, 0x3e ; cmp byte […], byte +… (extended)
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dw %1
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db %2
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%endmacro
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%macro cmpb_ext 2
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db 0x82, 0xf8 + %1
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db %2
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%endmacro
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jmp entrypoint
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@ -95,7 +100,7 @@ entrypoint: ; 0181
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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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cmpb_addr_ext psp_fcb_1 + fcb_filename, ' '
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je print_filename_missing_error
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; AL at program start a flag of whether drive specifier in first parameter valid
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@ -166,7 +171,7 @@ setup_file_parameters: ; 01ec
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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 dx, file_buffer
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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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@ -176,10 +181,10 @@ setup_file_parameters: ; 01ec
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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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jnz initialize_editor
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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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sub cx, file_buffer
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; cx is now the amount of memory available starting at file_buffer
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; __0a94 = ¼ available memory
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shr cx, 1
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@ -190,33 +195,37 @@ setup_file_parameters: ; 01ec
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addw r_cx, r_ax
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movw r_dx, r_cx
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add dx, disk_transfer_area
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add dx, file_buffer
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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_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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initialize_editor: ; 0240
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cld
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; Put ^Z at the end of the file in memory
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mov byte [di], 0x1a ; ^Z
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mov [__0a9a], di
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mov byte [input_buffer.size], input_buffer.bufend - input_buffer.bufstart
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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 [__0a92], file_buffer
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mov word [current_line], 1
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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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jnz editor_mainloop
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call __0370
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__0273:
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editor_mainloop: ; 0273
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mov sp, stack.end
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mov ax, sys_set_interrupt * 0x100 + int_ctrl_break
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mov dx, ctrl_break_handler
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@ -230,12 +239,15 @@ __0273:
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mov ah, sys_read_line
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int 0x21
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db 0xB0, 0x0A ; 028A mov al,0xa
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db 0xE8, 0x95, 0x06 ; 028C call 0x924
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db 0xC7, 0x06, 0x82, 0x0A, 0x00, 0x00 ; 028F mov word [0xa82],0x0
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db 0xC6, 0x06, 0x7D, 0x0A, 0x00 ; 0295 mov byte [0xa7d],0x0
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db 0xBE, 0x9E, 0x0A ; 029A mov si,0xa9e
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db 0xE8, 0x59, 0x00 ; 029D call 0x2f9
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mov al, 10 ; LF
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call print_char
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mov word [__0a82], 0
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mov byte [__0a7d], 0
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mov si, input_buffer.bufstart
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call parse_line_specifier
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db 0x89, 0x16, 0x80, 0x0A ; 02A0 mov [0xa80],dx
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db 0xE8, 0x43, 0x00 ; 02A4 call 0x2ea
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db 0x3C, 0x2C ; 02A7 cmp al,0x2c
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@ -265,50 +277,79 @@ db 0x72, 0x0F ; 02DE jc 0x2ef
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db 0xD1, 0xE3 ; 02E0 shl bx,1
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db 0xFF, 0x97, 0x4A, 0x03 ; 02E2 call [bx+0x34a]
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db 0xE9, 0x8A, 0xFF ; 02E6 jmp 0x273
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db 0xAC ; 02E9 lodsb
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db 0x3C, 0x20 ; 02EA cmp al,0x20
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db 0x74, 0xFB ; 02EC jz 0x2e9
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db 0xC3 ; 02EE ret
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db 0xBA, 0xF5, 0x09 ; 02EF mov dx,0x9f5
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db 0xB4, 0x09 ; 02F2 mov ah,0x9
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db 0xCD, 0x21 ; 02F4 int 0x21
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db 0xE9, 0x7A, 0xFF ; 02F6 jmp 0x273
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db 0xE8, 0xED, 0xFF ; 02F9 call 0x2e9
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db 0x3C, 0x2E ; 02FC cmp al,0x2e
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db 0x74, 0x35 ; 02FE jz 0x335
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db 0x3C, 0x23 ; 0300 cmp al,0x23
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db 0x74, 0x37 ; 0302 jz 0x33b
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db 0xBA, 0x00, 0x00 ; 0304 mov dx,0x0
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db 0xB1, 0x00 ; 0307 mov cl,0x0
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db 0x3C, 0x30 ; 0309 cmp al,0x30
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db 0x72, 0x1E ; 030B jc 0x32b
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db 0x3C, 0x39 ; 030D cmp al,0x39
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db 0x77, 0x1A ; 030F ja 0x32b
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db 0x81, 0xFA, 0x99, 0x19 ; 0311 cmp dx,0x1999
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db 0x73, 0xD8 ; 0315 jnc 0x2ef
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db 0xB1, 0x01 ; 0317 mov cl,0x1
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db 0x2C, 0x30 ; 0319 sub al,0x30
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db 0x8B, 0xDA ; 031B mov bx,dx
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db 0xD1, 0xE2 ; 031D shl dx,1
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db 0xD1, 0xE2 ; 031F shl dx,1
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db 0x03, 0xD3 ; 0321 add dx,bx
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db 0xD1, 0xE2 ; 0323 shl dx,1
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db 0x98 ; 0325 cbw
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db 0x03, 0xD0 ; 0326 add dx,ax
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db 0xAC ; 0328 lodsb
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db 0xEB, 0xDE ; 0329 jmp short 0x309
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db 0x82 ; 032B db 0x82
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db 0xF9 ; 032C stc
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db 0x00, 0x74, 0xBE ; 032D add [si-0x42],dh
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db 0x0B, 0xD2 ; 0330 or dx,dx
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db 0x74, 0xBB ; 0332 jz 0x2ef
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db 0xC3 ; 0334 ret
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db 0x8B, 0x16, 0x90, 0x0A ; 0335 mov dx,[0xa90]
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db 0xAC ; 0339 lodsb
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db 0xC3 ; 033A ret
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db 0xBA, 0xFE, 0xFF ; 033B mov dx,0xfffe
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db 0xAC ; 033E lodsb
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db 0xC3 ; 033F ret
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skip_spaces: ; 02e9
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lodsb
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cmp al, ' '
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je skip_spaces
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.ret: ret
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print_entry_error: ; 02ef
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mov dx, entry_error
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mov ah, sys_print_string
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int 0x21
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jmp editor_mainloop
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parse_line_specifier: ; 02f9
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call skip_spaces
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cmp al, '.'
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je .current_line
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cmp al, '#'
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je .last_line
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mov dx, 0
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mov cl, 0 ; No digits read yet
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.loop: ; 0309
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cmp al, '0'
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jb .not_digit
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cmp al, '9'
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ja .not_digit
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; Would we overflow?
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cmp dx, 65536 / 10
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jnb print_entry_error ; Yes
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mov cl, 1 ; We have now read a digit
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sub al, '0'
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; dx = dx*10
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movw r_bx, r_dx
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shl dx, 1
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shl dx, 1
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addw r_dx, r_bx
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shl dx, 1
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cbw
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addw r_dx, r_ax
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lodsb
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jmp .loop
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.not_digit: ; 032b
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; Have we started reading a number?
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cmpb_ext r_cl, 0
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je skip_spaces.ret ; No
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; Yes, and it's zero
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orw r_dx, r_dx
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jz print_entry_error
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; Yes, it's nonzero
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ret
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.current_line: ; 0335
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mov dx, [current_line]
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lodsb
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ret
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.last_line: ; 033b
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mov dx, 0xfffe ; TODO: Why 0xfffe and not 0xffff?
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lodsb
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ret
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db 0x51 ; 0340 push cx
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db 0x57 ; 0341 push di
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db 0x41 ; 0342 inc cx
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@ -358,7 +399,7 @@ __0370:
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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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jnb find_file_end_char.ret
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__0388:
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movw r_di, r_dx
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@ -388,7 +429,7 @@ __03ab:
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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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jna __03ca
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mov di, [__0a96]
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movw r_cx, r_ax
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@ -870,7 +911,7 @@ 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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jmp editor_mainloop
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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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@ -1004,7 +1045,7 @@ ctrl_break_handler: ; 092d
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call newline
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jmp __0273
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jmp editor_mainloop
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bak_extension db "BAK" ; 093e
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@ -1014,7 +1055,7 @@ 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$"
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oom_str db 13, 10, "Insufficient memory", 13, 10, '$' ; 09dd
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__09f5 db "Entry error", 13, 10, '$'
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entry_error db "Entry error", 13, 10, '$' ; 09f5
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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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@ -1026,15 +1067,15 @@ __0a45 db "Abort edit (Y/N)? $"
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section .bss
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__0a58_fcb: resb 37 ; 0a58 … 0a7c
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; 0a7d
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resb 1
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__0a7d: resb 1
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new_file_flag: resb 1 ; 0a7e
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__0a7f: resb 1
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__0a80: resw 1
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resb 14
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__0a90: resw 1
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__0a82: resw 1
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resb 12
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current_line: resw 1 ; 0a90
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__0a92: resw 1
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__0a94: resw 1
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@ -1060,4 +1101,4 @@ stack: resb 256 ; 0c48
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__0d48: resb 1
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disk_transfer_area: ; 0d49
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file_buffer: ; 0d49
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