mirror of
https://github.com/microsoft/MS-DOS.git
synced 2024-12-01 18:15:47 +00:00
531 lines
13 KiB
NASM
531 lines
13 KiB
NASM
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FALSE EQU 0
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TRUE EQU NOT FALSE
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KANJI EQU FALSE
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roprot equ FALSE ;set to TRUE if protection to r/o files
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; desired.
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FCB EQU 5CH
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Comand_Line_Length equ 128
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quote_char equ 16h ;quote character = ^V
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PAGE
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.xlist
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INCLUDE DOSSYM.ASM
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.list
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SUBTTL Contants and Data areas
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PAGE
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PROMPT EQU "*"
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STKSIZ EQU 80H
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CODE SEGMENT PUBLIC
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CODE ENDS
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CONST SEGMENT PUBLIC WORD
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EXTRN TXT1:BYTE,TXT2:BYTE,FUDGE:BYTE,HARDCH:DWORD,USERDIR:BYTE
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CONST ENDS
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DATA SEGMENT PUBLIC WORD
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EXTRN OLDLEN:WORD,OLDDAT:BYTE,SRCHFLG:BYTE,COMLINE:WORD
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EXTRN PARAM1:WORD,PARAM2:WORD,NEWLEN:WORD,SRCHMOD:BYTE
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EXTRN CURRENT:WORD,POINTER:WORD,START:BYTE,ENDTXT:WORD
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EXTRN USER_DRIVE:BYTE,LSTNUM:WORD,NUMPOS:WORD,LSTFND:WORD
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EXTRN SRCHCNT:WORD
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DATA ENDS
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DG GROUP CODE,CONST,DATA
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CODE SEGMENT PUBLIC
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ASSUME CS:DG,DS:DG,SS:DG,ES:DG
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PUBLIC REST_DIR,KILL_BL,INT_24,SCANLN,FINDLIN,SHOWNUM
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PUBLIC FNDFIRST,FNDNEXT,CRLF,LF,OUT,UNQUOTE
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if kanji
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PUBLIC TESTKANJ
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endif
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EXTRN CHKRANGE:NEAR
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EDLPROC:
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RET1: RET
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FNDFIRST:
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MOV DI,1+OFFSET DG:TXT1
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mov byte ptr[olddat],1 ;replace with old value if none new
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CALL GETTEXT
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OR AL,AL ;Reset zero flag in case CX is zero
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JCXZ RET1
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cmp al,1ah ;terminated with a ^Z ?
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jne sj8
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mov byte ptr[olddat],0 ;do not replace with old value
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sj8:
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MOV [OLDLEN],CX
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XOR CX,CX
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CMP AL,0DH
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JZ SETBUF
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CMP BYTE PTR [SRCHFLG],0
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JZ NXTBUF
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SETBUF:
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DEC SI
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NXTBUF:
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MOV [COMLINE],SI
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MOV DI,1+OFFSET DG:TXT2
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CALL GETTEXT
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CMP BYTE PTR [SRCHFLG],0
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JNZ NOTREPL
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CMP AL,0DH
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JNZ HAVCHR
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DEC SI
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HAVCHR:
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MOV [COMLINE],SI
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NOTREPL:
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MOV [NEWLEN],CX
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MOV BX,[PARAM1]
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OR BX,BX
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JNZ CALLER
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cmp byte ptr[srchmod],0
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jne sj9
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mov bx,1 ;start from line number 1
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jmp short sj9a
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sj9:
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MOV BX,[CURRENT]
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INC BX ;Default search and replace to current+1
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sj9a:
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CALL CHKRANGE
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CALLER:
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CALL FINDLIN
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MOV [LSTFND],DI
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MOV [NUMPOS],DI
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MOV [LSTNUM],DX
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MOV BX,[PARAM2]
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CMP BX,1
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SBB BX,-1 ;Decrement everything except zero
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CALL FINDLIN
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MOV CX,DI
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SUB CX,[LSTFND]
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OR AL,-1
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JCXZ aret
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CMP CX,[OLDLEN]
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jae sj10
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aret: ret
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sj10:
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MOV [SRCHCNT],CX
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FNDNEXT:
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; Inputs:
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; [TXT1+1] has string to search for
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; [OLDLEN] has length of the string
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; [LSTFND] has starting position of search in text buffer
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; [LSTNUM] has line number which has [LSTFND]
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; [SRCHCNT] has length to be searched
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; [NUMPOS] has beginning of line which has [LSTFND]
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; Outputs:
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; Zero flag set if match found
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; [LSTFND],[LSTNUM],[SRCHCNT] updated for continuing the search
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; [NUMPOS] has beginning of line in which match was made
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MOV AL,[TXT1+1]
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MOV CX,[SRCHCNT]
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MOV DI,[LSTFND]
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SCAN:
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OR DI,DI ;Clear zero flag in case CX=0
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REPNE SCASB
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JNZ RET11
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MOV DX,CX
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MOV BX,DI ;Save search position
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MOV CX,[OLDLEN]
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DEC CX
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MOV SI,2 + OFFSET DG:TXT1
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CMP AL,AL ;Set zero flag in case CX=0
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if kanji
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dec si ;Want to look at the first character again
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dec di
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kanjchar:
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lodsb
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call testkanj
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jz nxt_kj_char
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xchg ah,al
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lodsb
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mov bx,[di]
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add di,2
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cmp ax,bx
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jnz not_kj_match
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dec cx
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loop kanjchar
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nxt_kj_char:
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cmp al,byte ptr[di]
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jnz not_kj_match
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inc di
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loop kanjchar
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not_kj_match:
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else
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REPE CMPSB
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endif
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MOV CX,DX
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MOV DI,BX
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JNZ SCAN
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MOV [SRCHCNT],CX
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MOV CX,DI
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MOV [LSTFND],DI
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MOV DI,[NUMPOS]
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SUB CX,DI
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MOV AL,10
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MOV DX,[LSTNUM]
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;Determine line number of match
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GETLIN:
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INC DX
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MOV BX,DI
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REPNE SCASB
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JZ GETLIN
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DEC DX
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MOV [LSTNUM],DX
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MOV [NUMPOS],BX
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XOR AL,AL
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RET11: RET
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GETTEXT:
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; Inputs:
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; SI points into command line buffer
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; DI points to result buffer
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; Function:
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; Moves [SI] to [DI] until ctrl-Z (1AH) or
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; RETURN (0DH) is found. Termination char not moved.
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; Outputs:
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; AL = Termination character
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; CX = No of characters moved.
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; SI points one past termination character
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; DI points to next free location
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XOR CX,CX
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GETIT:
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LODSB
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;-----------------------------------------------------------------------
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cmp al,quote_char ;a quote character?
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jne sj101 ;no, skip....
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lodsb ;yes, get quoted character
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call make_cntrl
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jmp short sj102
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;-----------------------------------------------------------------------
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sj101:
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CMP AL,1AH
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JZ DEFCHK
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sj102:
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CMP AL,0DH
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JZ DEFCHK
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STOSB
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INC CX
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JMP SHORT GETIT
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DEFCHK:
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OR CX,CX
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JZ OLDTXT
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PUSH DI
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SUB DI,CX
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MOV BYTE PTR [DI-1],cl
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POP DI
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RET
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OLDTXT:
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cmp byte ptr[olddat],1 ;replace with old text?
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je sj11 ;yes...
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mov byte ptr[di-1],cl ;zero text buffer char count
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ret
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sj11:
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MOV CL,BYTE PTR [DI-1]
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ADD DI,CX
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RET
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FINDLIN:
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; Inputs
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; BX = Line number to be located in buffer (0 means last line)
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; Outputs:
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; DX = Actual line found
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; DI = Pointer to start of line DX
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; Zero set if BX = DX
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; AL,CX destroyed. No other registers affected.
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MOV DX,[CURRENT]
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MOV DI,[POINTER]
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CMP BX,DX
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JZ RET4
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JA FINDIT
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OR BX,BX
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JZ FINDIT
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MOV DX,1
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MOV DI,OFFSET DG:START
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CMP BX,DX
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JZ RET4
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FINDIT:
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MOV CX,[ENDTXT]
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SUB CX,DI
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SCANLN:
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MOV AL,10
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OR AL,AL ;Clear zero flag
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FINLIN:
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JCXZ RET4
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REPNE SCASB
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INC DX
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CMP BX,DX
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JNZ FINLIN
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RET4: RET
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SHOWNUM:
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; Inputs:
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; BX = Line number to be displayed
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; Function:
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; Displays line number on terminal in 8-character
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; format, suppressing leading zeros.
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; AX, CX, DX destroyed. No other registers affected.
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PUSH BX
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MOV AL," "
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CALL OUT
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CALL CONV10
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MOV AL,":"
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CALL OUT
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MOV AL,"*"
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POP BX
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CMP BX,[CURRENT]
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JZ STARLIN
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MOV AL," "
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STARLIN:
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JMP OUT
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CONV10:
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;Inputs:
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; BX = Binary number to be displayed
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; Function:
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; Ouputs binary number. Five digits with leading
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; zero suppression. Zero prints 5 blanks.
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XOR AX,AX
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MOV DL,AL
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MOV CX,16
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CONV:
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SHL BX,1
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ADC AL,AL
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DAA
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XCHG AL,AH
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ADC AL,AL
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DAA
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XCHG AL,AH
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ADC DL,DL
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LOOP CONV
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MOV BL,"0"-" "
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XCHG AX,DX
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CALL LDIG
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MOV AL,DH
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CALL DIGITS
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MOV AL,DL
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DIGITS:
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MOV DH,AL
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SHR AL,1
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SHR AL,1
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SHR AL,1
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SHR AL,1
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CALL LDIG
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MOV AL,DH
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LDIG:
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AND AL,0FH
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JZ ZERDIG
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MOV BL,0
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ZERDIG:
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ADD AL,"0"
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SUB AL,BL
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JMP OUT
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RET5: RET
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CRLF:
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MOV AL,13
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CALL OUT
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LF:
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MOV AL,10
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OUT:
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PUSH DX
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XCHG AX,DX
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MOV AH,STD_CON_OUTPUT
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INT 21H
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XCHG AX,DX
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POP DX
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RET
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;-----------------------------------------------------------------------;
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; Will scan buffer given pointed to by SI and get rid of quote
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;characters, compressing the line and adjusting the length at the
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;begining of the line.
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; Preserves al registers except flags and AX .
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unquote:
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push cx
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push di
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push si
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mov di,si
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mov cl,[si-1] ;length of buffer
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xor ch,ch
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mov al,quote_char
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cld
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unq_loop:
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jcxz unq_done ;no more chars in the buffer, exit
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repnz scasb ;search for quote character
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jnz unq_done ;none found, exit
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push cx ;save chars left in buffer
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push di ;save pointer to quoted character
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push ax ;save quote character
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mov al,byte ptr[di] ;get quoted character
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call make_cntrl
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mov byte ptr[di],al
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pop ax ;restore quote character
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mov si,di
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dec di ;points to the quote character
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inc cx ;include the carriage return also
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rep movsb ;compact line
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pop di ;now points to after quoted character
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pop cx
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jcxz sj13 ;if quote char was last of line do not adjust
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dec cx ;one less char left in the buffer
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sj13: pop si
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dec byte ptr[si-1] ;one less character in total buffer count also
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push si
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jmp short unq_loop
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unq_done:
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pop si
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pop di
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pop cx
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ret
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;-----------------------------------------------------------------------;
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; Convert the character in AL to the corresponding control
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; character. AL has to be between @ and _ to be converted. That is,
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; it has to be a capital letter. All other letters are left unchanged.
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make_cntrl:
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push ax
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and ax,11100000b
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cmp ax,01000000b
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pop ax
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jne sj14
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and ax,00011111b
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sj14:
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ret
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;---- Kill spaces in buffer --------------------------------------------;
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kill_bl:
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lodsb ;get rid of blanks
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cmp al,' '
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je kill_bl
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ret
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;----- Restore INT 24 vector and old current directory -----------------;
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rest_dir:
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cmp [fudge],0
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je no_fudge
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mov ax,(set_interrupt_vector shl 8) or 24h
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lds dx,[hardch]
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int 21h
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push cs
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pop ds
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mov dx,offset dg:userdir ;restore directory
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mov ah,chdir
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int 21h
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mov dl,[user_drive] ;restore old current drive
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mov ah,set_default_drive
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int 21h
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no_fudge:
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ret
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;----- INT 24 Processing -----------------------------------------------;
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int_24_retaddr dw offset dg:int_24_back
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int_24 proc far
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assume ds:nothing,es:nothing,ss:nothing
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pushf
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push cs
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push [int_24_retaddr]
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push word ptr [hardch+2]
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push word ptr [hardch]
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ret
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int_24 endp
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int_24_back:
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cmp al,2 ;abort?
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jnz ireti
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push cs
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pop ds
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assume ds:dg
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call rest_dir
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int 20h
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ireti:
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iret
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IF KANJI
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TESTKANJ:
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CMP AL,81H
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JB NOTLEAD
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CMP AL,9FH
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JBE ISLEAD
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CMP AL,0E0H
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JB NOTLEAD
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CMP AL,0FCH
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JBE ISLEAD
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NOTLEAD:
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PUSH AX
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XOR AX,AX ;Set zero
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POP AX
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RET
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ISLEAD:
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PUSH AX
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XOR AX,AX ;Set zero
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INC AX ;Reset zero
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POP AX
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RET
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ENDIF
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;-----------------------------------------------------------------------;
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CODE ENDS
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END EDLPROC
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