mirror of https://github.com/microsoft/MS-DOS.git
291 lines
9.3 KiB
NASM
291 lines
9.3 KiB
NASM
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TITLE CPARSE
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INCLUDE COMSW.ASM
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.xlist
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.xcref
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INCLUDE DOSSYM.ASM
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INCLUDE DEVSYM.ASM
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INCLUDE COMSEG.ASM
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.list
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.cref
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INCLUDE COMEQU.ASM
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DATARES SEGMENT PUBLIC
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DATARES ENDS
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TRANDATA SEGMENT PUBLIC
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EXTRN BADCPMES:BYTE
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TRANDATA ENDS
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TRANSPACE SEGMENT PUBLIC
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EXTRN CURDRV:BYTE,ELPOS:BYTE,STARTEL:WORD
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EXTRN SKPDEL:BYTE,SWITCHAR:BYTE,ELCNT:BYTE
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TRANSPACE ENDS
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TRANCODE SEGMENT PUBLIC BYTE
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ASSUME CS:TRANGROUP,DS:TRANGROUP,ES:TRANGROUP
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EXTRN DELIM:NEAR,UPCONV:NEAR,PATHCHRCMP:NEAR
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EXTRN SWLIST:BYTE,BADCDERR:NEAR,SCANOFF:NEAR,CERROR:NEAR
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if KANJI
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EXTRN TESTKANJ:NEAR
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endif
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SWCOUNT EQU 5
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PUBLIC CPARSE
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CPARSE:
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;-----------------------------------------------------------------------;
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; ENTRY: ;
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; DS:SI Points input buffer ;
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; ES:DI Points to the token buffer ;
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; BL Special delimiter for this call ;
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; Always checked last ;
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; set it to space if there is no special delimiter ;
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; EXIT: ;
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; DS:SI Points to next char in the input buffer ;
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; ES:DI Points to the token buffer ;
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; [STARTEL] Points to start of last element of path in token ;
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; points to a NUL for no element strings 'd:' 'd:/' ;
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; CX Character count ;
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; BH Condition Code ;
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; Bit 1H of BH set if switch character ;
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; Token buffer contains char after ;
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; switch character ;
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; BP has switch bits set (ORing only) ;
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; Bit 2H of BH set if ? or * in token ;
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; if * found element ? filled ;
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; Bit 4H of BH set if path sep in token ;
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; Bit 80H of BH set if the special delimiter ;
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; was skipped at the start of this token ;
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; Token buffer always starts d: for non switch tokens ;
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; CARRY SET ;
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; if CR on input ;
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; token buffer not altered ;
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; ;
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; DOES NOT RETURN ON BAD PATH ERROR ;
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; MODIFIES: ;
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; CX, SI, AX, BH, DX and the Carry Flag ; ;
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; ;
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; -----------------------------------------------------------------------;
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xor ax,ax
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mov [STARTEL],DI ; No path element (Is DI correct?)
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mov [ELPOS],al ; Start in 8 char prefix
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mov [SKPDEL],al ; No skip delimiter yet
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mov bh,al ; Init nothing
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pushf ; save flags
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push di ; save the token buffer addrss
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xor cx,cx ; no chars in token buffer
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moredelim:
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LODSB
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CALL DELIM
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JNZ SCANCDONE
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CMP AL,' '
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JZ moredelim
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CMP AL,9
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JZ moredelim
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xchg al,[SKPDEL]
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or al,al
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jz moredelim ; One non space/tab delimiter allowed
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JMP x_done ; Nul argument
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SCANCDONE:
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IF NOT KANJI
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call UPCONV
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ENDIF
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cmp al,bl ; Special delimiter?
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jnz nospec
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or bh,80H
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jmp short moredelim
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nospec:
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cmp al,0DH ; a CR?
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jne ncperror
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jmp cperror
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ncperror:
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cmp al,[SWITCHAR] ; is the char the switch char?
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jne na_switch ; yes, process...
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jmp a_switch
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na_switch:
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cmp byte ptr [si],':'
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jne anum_chard ; Drive not specified
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IF KANJI
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call UPCONV
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ENDIF
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call move_char
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lodsb ; Get the ':'
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call move_char
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mov [STARTEL],di
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mov [ELCNT],0
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jmp anum_test
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anum_chard:
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mov [STARTEL],di
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mov [ELCNT],0 ; Store of this char sets it to one
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call PATHCHRCMP ; Starts with a pathchar?
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jnz anum_char ; no
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push ax
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mov al,[CURDRV] ; Insert drive spec
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add al,'A'
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call move_char
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mov al,':'
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call move_char
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pop ax
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mov [STARTEL],di
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mov [ELCNT],0
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anum_char:
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IF KANJI
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call TESTKANJ
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jz TESTDOT
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call move_char
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lodsb
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jmp short notspecial
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TESTDOT:
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ENDIF
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cmp al,'.'
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jnz testquest
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inc [ELPOS] ; flag in extension
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mov [ELCNT],0FFH ; Store of the '.' resets it to 0
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testquest:
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cmp al,'?'
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jnz testsplat
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or bh,2
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testsplat:
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cmp al,'*'
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jnz testpath
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or bh,2
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mov ah,7
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cmp [ELPOS],0
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jz gotelcnt
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mov ah,2
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gotelcnt:
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mov al,'?'
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sub ah,[ELCNT]
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jc badperr2
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xchg ah,cl
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jcxz testpathx
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qmove:
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xchg ah,cl
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call move_char
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xchg ah,cl
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loop qmove
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testpathx:
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xchg ah,cl
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testpath:
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call PATHCHRCMP
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jnz notspecial
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or bh,4
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test bh,2 ; If just hit a '/', cannot have ? or * yet
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jnz badperr
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mov [STARTEL],di ; New element
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INC [STARTEL] ; Point to char after /
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mov [ELCNT],0FFH ; Store of '/' sets it to 0
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mov [ELPOS],0
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notspecial:
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call move_char ; just an alphanum string
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anum_test:
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lodsb
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IF NOT KANJI
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call UPCONV
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ENDIF
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call DELIM
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je x_done
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cmp al,0DH
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je x_done
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cmp al,[SWITCHAR]
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je x_done
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cmp al,bl
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je x_done
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cmp al,':' ; ':' allowed as trailer because
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; of devices
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IF KANJI
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je FOO15
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jmp anum_char
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FOO15:
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ELSE
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jne anum_char
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ENDIF
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mov byte ptr [si-1],' ' ; Change the trailing ':' to a space
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jmp short x_done
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badperr2:
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mov dx,offset trangroup:BADCPMES
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jmp CERROR
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badperr:
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jmp BADCDERR
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cperror:
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dec si ; adjust the pointer
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pop di ; retrive token buffer address
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popf ; restore flags
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stc ; set the carry bit
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return
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x_done:
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dec si ; adjust for next round
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jmp short out_token
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a_switch:
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OR BH,1 ; Indicate switch
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OR BP,GOTSWITCH
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CALL SCANOFF
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INC SI
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cmp al,0DH
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je cperror
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call move_char ; store the character
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CALL UPCONV
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PUSH ES
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PUSH DI
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PUSH CX
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PUSH CS
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POP ES
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ASSUME ES:TRANGROUP
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MOV DI,OFFSET TRANGROUP:SWLIST
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MOV CX,SWCOUNT
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REPNE SCASB
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JNZ out_tokenp
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MOV AX,1
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SHL AX,CL
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OR BP,AX
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out_tokenp:
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POP CX
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POP DI
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POP ES
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ASSUME ES:NOTHING
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out_token:
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mov al,0
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stosb ; null at the end
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pop di ; restore token buffer pointer
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popf
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clc ; clear carry flag
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return
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move_char:
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stosb ; store char in token buffer
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inc cx ; increment char count
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inc [ELCNT] ; increment element count for * substi
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return
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TRANCODE ENDS
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END
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