;B
Page 66,96
Title Character count program
;
; -------------------- SIZE --------------------------
;
; Format: SIZE
; Purpose: To count the number of bytes in the
; standard input file.
; Parameters: None.
; Options: None.
; Examples: To count the number of characters:
; size <innfile
; To count the number of lines using TRANSLIT:
; translit ^@n | size <infile
; To count the number of words using TRANSLIT:
; translit " "@t@n @n | translit ^@n | size
; Written: SvJo, 1/11 1984
; Last change: SvJo, 14/7 1985
;
; ------------------------------------------------------
;
; Written in assembly to implement redirection
; under DOS 2.0
;
CR EQU 0DH
LF EQU 0AH
TAB EQU 09H
FF EQU 0CH
EOF EQU 1AH
;
COUNT SEGMENT
;
ORG 100H
;
ASSUME CS:COUNT
;
Start: JMP CNT1
;
; Stack space
;
DW 40 DUP (0)
SStk LABEL WORD
;
; Some variables
;
Char DB ' '
;
Wrong DB CR,LF
DB 'Sorry, you need DOS 2.0 or later '
DB 'to run this program.'
DB CR,LF
;
WLen EQU $-Wrong
;
Fulld DB CR,LF
DB 'Sorry, no more room on disk. '
DB CR,LF
;
FLen EQU $-Fulld
;
CntMsg DB CR,LF
DB 'Size = '
CntBeg DB 0,0,0,0,0,0
CntEnd DB 0
CntDif EQU CntEnd-CntBeg
DB CR,LF
;
CntLen EQU $-CntMsg
;
CNT1: MOV AX,CS
MOV DS,AX
MOV ES,AX
MOV SS,AX
;
ASSUME DS: COUNT
ASSUME ES: COUNT
ASSUME SS: COUNT
;
MOV SP,Offset SStk
;
; Check that operating system version is compatible
;
MOV AH,30H
INT 21H
CMP AL,2 ;Version must be at least 2.0
JGE CNT2
;
; Wrong version DOS, send message and abort
;
MOV AH,40H
MOV BX,02H ;Standard error device
MOV CX,WLen
MOV DX,Offset Wrong
INT 21H
;
MOV AX,0
INT 21H ;Abort
;
; Clear ASCII accumulator
;
CNT2: MOV AL,0
MOV DI,Offset CntBeg
MOV CX,CntDif+1
REP STOSB
;
CNT3: CALL GETC
TEST AH,AH
JNZ CNT10
TEST AL,AL
JZ CNT3
;
; Legal character, increment in ASCII
;
MOV BX,Offset CntEnd
MOV AL,[BX]
DEC BX
MOV CX,CntDif
MOV AH,[BX]
ADD AL,1
;
CNT4: AAA
MOV [BX+1],AL
MOV AL,AH
JNB CNT3
DEC BX
MOV AH,[BX]
JMP CNT4
;
; Make ASCII and eliminate leading zeros
;
CNT10: MOV BX,Offset CntBeg
MOV AH,' '
MOV CX,CntDif
;
CNT11: MOV AL,[BX]
OR AL,AH
CMP AL,AH
JE CNT12
MOV AH,'0'
OR AL,AH
CNT12: MOV [BX],AL
INC BX
LOOP CNT11
;
OR BYTE PTR [BX],'0'
;
; Send count to standard output
;
MOV CX,CntLen
MOV AH,40H ;Write
MOV BX,01H ;Standard output
MOV DX,Offset CntMsg
PUSH CX
INT 21H
POP CX
CMP AX,CX ;Equal if OK
JE CNT25
;
MOV AH,40H
MOV BX,02H ;Standard error device
MOV CX,FLen
MOV DX,Offset Fulld
INT 21H
;
MOV AX,0
INT 21H ;Abort
;
CNT25: CALL CLOSE ;Close file
;
MOV AX,0
INT 21H ;Abort
;
; Get a character from standard input
; Return char. in AL, EOF in AH
;
GETC: MOV AH,3FH ;Read
MOV BX,0 ;Standard input
MOV DX,Offset Char
MOV CX,1 ;One byte
INT 21H
MOV AH,0FFH ;Check for EOF
AND AL,AL
JZ GETC2
CMP Char,EOF
JE GETC2
INC AH
CMP Char,LF ;LF and not EOF?
JE GETC ;Then get next char
GETC2: MOV AL,Char
RET
;
; Close standard output
;
CLOSE: MOV AH,3EH ;Close
MOV BX,01H ;Std. out
INT 21H
RET
;
COUNT ENDS
;
END Start
