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|
; SCCSID = @(#)print.asm 1.1 85/04/10
;
; PFMT - formatted output. Calling sequence:
; PUSH BP
; PUSH fmtstr
; MOV BP,SP
; PUSH args
; CALL PFMT
; ADD SP,n
; POP BP
;
; The format string contains format directives and normal output characters
; much like the PRINTF for C. We utilize NO format widths. Special chars
; and strings are:
;
; $x output a hex number
; $s output an offset string
; $c output a character
; $S output a segmented string
; $p output userid/processid
; \t output a tab
; \n output a CRLF
;
; The format string must be addressable via CS
;
Procedure PFMT,NEAR
SaveReg <AX,BX,DS,SI>
MOV AX,8007h
INT 2Ah
PUSH CS
POP DS
SUB BP,2
Call FMTGetArg
MOV SI,AX
FmtLoop:
LODSB
OR AL,AL
JZ FmtDone
CMP AL,'$'
JZ FmtOpt
CMP AL,'\'
JZ FmtChr
FmtOut:
CALL Out
JMP FmtLoop
Out:
SaveReg <SI,DI,BP>
INT 29h
RestoreReg <BP,DI,SI>
return
FmtDone:
MOV AX,8107h
INT 2Ah
RestoreReg <SI,DS,BX,AX>
RET
;
; \ leads in a special character. See what the next char is.
;
FmtChr: LODSB
OR AL,AL ; end of string
JZ fmtDone
CMP AL,'n' ; newline
JZ FmtCRLF
CMP AL,'t' ; tab
JNZ FmtOut
MOV AL,9
JMP FmtOut
FmtCRLF:MOV AL,13
CALL Out
MOV AL,10
JMP FmtOut
;
; $ leads in a format specifier.
;
FmtOpt: LODSB
CMP AL,'x' ; hex number
JZ FmtX
CMP AL,'c' ; single character
JZ FmtC
CMP AL,'s' ; offset string
JZ FmtSoff
CMP AL,'S' ; segmented string
JZ FmtSseg
CMP AL,'p'
JZ FmtUPID
JMP FmtOut
FmtX:
Call FMTGetArg
MOV BX,AX
CALL MNUM
JMP FmtLoop
FmtC:
Call FmtGetArg
CALL Out
JMP FmtLoop
FmtSoff:
SaveReg <SI>
Call FmtGetArg
MOV SI,AX
CALL fmtsout
RestoreReg <SI>
JMP FmtLoop
FmtSSeg:
SaveReg <DS,SI>
CALL FMTGetArg
MOV DS,AX
CALL FMTGetArg
MOV SI,AX
CALL fmtsout
RestoreReg <SI,DS>
JMP FmtLoop
FmtUPID:
SaveReg <DS>
MOV BX,0
MOV DS,BX
MOV DS,DS:[82h]
ASSUME DS:DOSGroup
MOV BX,User_ID
CALL MNUM
MOV AL,':'
CALL OUT
MOV BX,Proc_ID
CALL MNUM
RestoreReg <DS>
Assume DS:NOTHING
JMP FmtLoop
EndProc PFMT
Procedure FMTGetArg,NEAR
MOV AX,[BP]
SUB BP,2
return
EndProc FMTGetArg
Procedure FmtSOut,NEAR
LODSB
OR AL,AL
retz
CALL OUT
JMP FmtSOut
EndProc FMTSout
;
; MOut - output a message via INT 29h
; Inputs: BX points to bytes to output relative to CS
; Outputs: message
; Registers modified: BX
Procedure MOut,Near
ASSUME DS:NOTHING,SS:NOTHING,ES:NOTHING
PUSHF
SaveReg <DS,SI,AX>
PUSH CS
POP DS
MOV SI,BX
Call FMTSout
RestoreReg <AX,SI,DS>
POPF
return
EndProc MOut
; MNum - output a number in BX
; Inputs: BX contains a number
; Outputs: number in hex appears on screen
; Registers modified: BX
Procedure MNum,NEAR
ASSUME DS:NOTHING,ES:NOTHING,SS:NOTHING
PUSHF
SaveReg <ES,DI,AX,BX,CX,SI,DS>
PUSH SS
POP ES
SUB SP,6
MOV DI,SP ; p = MNumBuf;
SaveReg <DI>
MOV CX,4 ; for (i=0; i < 4; i++)
DLoop: SaveReg <CX>
MOV CX,4 ; rotate(n, 4);
ROL BX,CL
RestoreReg <CX>
MOV AL,BL
AND AL,0Fh
ADD AL,'0'
CMP AL,'9'
JBE Nok
ADD AL,'A'-'0'-10
Nok: STOSB ; *p++ = "0123456789ABCDEF"[n];
LOOP DLoop
XOR AL,AL
STOSB ; *p++ = 0;
RestoreReg <SI>
PUSH ES
POP DS
CALL FMTSOUT ; mout (mNumBuf);
ADD SP,6
RestoreReg <DS,SI,CX,BX,AX,DI,ES>
POPF
return
EndProc MNum
|
