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C/C++ Users Group Library 1996 July
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C-C++ Users Group Library July 1996.iso
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vol_100
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192_01
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sectora.a
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1980-01-01
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59 lines
DSEG
GETMSG DB '** Error reading diskette! ',13,10,0
PUTMSG DB '** Error writing diskette! ',13,10,0
CSEG
PUBLIC GETSECT_,PUTSECT_,PRINTF_,EXIT_
; GETSECT - READS A SECTOR FROM DISKETTE. CALL SEQUENCE IS:
; getsect(buf,drv,sect) where
; buf = buffer address of 512 bytes where data will be placed
; drv = DOS drive number
; sect = logical sector number
;
GETSECT_: PUSH BP
MOV BP,SP
MOV CX,1 ; READ 1 SECTOR
MOV BX,[BP+4] ; BUFFER ADDRESS
MOV AX,[BP+6] ; DRIVE NUMBER
MOV DX,[BP+8] ; SECTOR NUMBER
INT 25H ; DO THE READ
POP AX ; RESTORE STACK DUE TO FLAGS
JNC GETOK ; CHECK FOR READ ERROR
MOV AX,OFFSET GETMSG
PUSH AX
CALL PRINTF_
POP AX
CALL EXIT_
JNC GETOK ; CHECK FOR READ ERROR
MOV AX,OFFSET GETMSG
PUSH AX
CALL PRINTF_
POP AX
CALL EXIT_
GETOK: POP BP
RET
;
; PUTSECT - WRITES A SECTOR TO DISKETTE. CALL SEQUENCE IS:
; putsect(buf,drv,sect) where
; buf = buffer address of 512 bytes to be written
; drv = DOS drive number
; sect = logical sector number
;
PUTSECT_: PUSH BP
MOV BP,SP
MOV CX,1 ; WRITE 1 SECTOR
MOV BX,[BP+4] ; BUFFER ADDRESS
MOV AX,[BP+6] ; DRIVE NUMBER
MOV DX,[BP+8] ; SECTOR NUMBER
INT 26H ; DO THE WRITE
POP AX ; RESTORE STACK DUE TO FLAGS
JNC PUTOK ; CHECK FOR READ ERROR
MOV AX,OFFSET PUTMSG
PUSH AX
CALL PRINTF_
POP AX
CALL EXIT_
PUTOK: POP BP
RET
END