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|
page ,132 ;
;*****************************************************************************
;*****************************************************************************
;UTILITY NAME: CHKOVER.COM
;
;MODULE NAME: CHKINIT.SAL
;
;�����������Ŀ
;� Main_Init �
;�������������
; �
; ������������������Ŀ ����������������Ŀ
; ôInit_Input_Output�����´Preload_Messages�
; �������������������� �������������������
; � ��������������������Ŀ
; � ôParse_Drive_Letter �
; � ����������������������
; � ��������������������Ŀ
; � ôParse_Command_Line �
;; � ����������������������
; � ����������������Ŀ
; � ��Interpret_Parse�
; � �����������������
; ����������������������Ŀ ������������������Ŀ
; ôValidate_Target_Drive�´Check_Target_Drive�
; �����������������������ٳ��������������������
; � ������������������Ŀ
; � ôCheck_For_Network�
; � ��������������������
; � ����������������������Ŀ
; � ��Check_Translate_Drive�
; � �����������������������
; ����������������Ŀ
; ôHook_Interrupts�
; ������������������
; ���������������Ŀ
; ôClear_Append_X�
; �����������������
; �����������Ŀ ��������������Ŀ
; ôCHKDSK_IFS�´EXEC_FS_CHKDSK�
; ������������ٳ����������������
; � �������������Ŀ
; � ��Main_Routine�
; � ��������������
; ���������������Ŀ
; ��Reset_Append_X�
; ����������������
;*****************************************************************************
;;an099;dcl for p3202
;*****************************************************************************
;
;*****************************************************************************
; Include files
;*****************************************************************************
.xlist ;an000;bgb
include chkseg.inc ;an005;bgb ;an000;bgb
include pathmac.inc ;an000;bgb
INCLUDE CHKEQU.INC ; ;an000;bgb;AN000;
INCLUDE CHKCHNG.INC ;List of changes ;an000;bgb
include dossym.inc ;an000;bgb
INCLUDE SYSCALL.INC ; ;an000;bgb;AN000;
INCLUDE CHKMACRO.INC ; ;an000;bgb;AN000;
INCLUDE CHKPARSE.INC ; ;an000;bgb;AN000;
INCLUDE IOCTL.INC ;an000;bgb
.list ;an000;bgb
;an000;bgb
;an000;bgb
;an000;bgb
psp segment public para 'DUMMY' ;an000;bgb
org 05Ch ;an000;bgb
FCB1 label byte ;an000;bgb
org 06Ch ;an000;bgb
FCB2 label byte ;an000;bgb
psp ends ;an000;bgb
;an000;bgb
; ;an000;bgb
DATA segment public para 'DATA' ;an000;bgb
;***************************************************************************** ;an000;bgb
; Data Area ;an000;bgb
;***************************************************************************** ;an000;bgb
old_drive db 0 ;an000;bgb
include version.inc
IF IBMCOPYRIGHT
ELSE
myramdisk db 'RDV 1.20'
ENDIF
myvdisk db 'VDISK' ;an000;bgb
bytes_per_sector dw 0 ;an005;bgb ;an000;bgb
BPB_Buffer A_DeviceParameters <> ; ;an000;bgb;AN000;
;an000;bgb
Data_Start_Low dw ? ; ;an000;bgb;AN000;
Data_Start_High dw ? ; ;an000;bgb
;an000;bgb
public command_line_buffer ;an046;bgb
Command_Line_Buffer db 128 dup(0) ; ;an000;bgb;AN000;
Command_Line_Length equ $ - Command_Line_Buffer ; ;an000;bgb;AN000;
;an046;bgb
Fatal_Error db 0 ; ;an000;bgb;AN000;
;an000;bgb
Command_Line db NO ; ;an000;bgb
Append db 0 ; ;an000;bgb
;an000;bgb
ifdef fsexec ;an038;bgb
;These should stay together ; ;an038;bgb
; --------------------------------------- ; ; ;an038;bgb
FS_String_Buffer db 13 dup(" ") ; ;an038;bgb
FS_String_End db "CHK.EXE",0 ; ;an038;bgb
Len_FS_String_End equ $ - FS_String_End ; ;an038;bgb
;---------------------------------------- ; ;an038;bgb
FS_Not_Fat db 0 ; ;an038;bgb
FAT12_String db "FAT12 " ; ;an038;bgb
FAT16_String db "FAT16 " ; ;an038;bgb
Len_FS_ID_String equ $ - FAT16_String ; ;an038;bgb
Media_ID_Buffer Media_ID <> ; ;an038;bgb
endif ;an038;bgb
ExitStatus db 0 ; ;an000;bgb;AN000;
;an000;bgb
PSP_Segment dw 0 ; ;an000;bgb;AN000;
tot_bytes_lo dw 0 ; low word of number of sectors in disk ;an000;bgb;an006;bgb
tot_bytes_hi dw 0 ;high word of number of sectors in disk ;an000;bgb;an006;bgb
fat_dir_secs dw 0 ;sectors in fat, directory and resvd ;an000;bgb;an006;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
; Public Data Declarations ;an000;bgb
;***************************************************************************** ;an000;bgb
public bpb_buffer ;an000;bgb;an006;bgb
public tot_bytes_lo ;an000;bgb;an006;bgb
public tot_bytes_hi ;an000;bgb;an006;bgb
public fat_dir_secs ;an000;bgb;an006;bgb
public bytes_per_sector ;an000;bgb;an005;bgb
Public Data_Start_Low ;an000;bgb
Public Data_Start_High ;an000;bgb
Public Fatal_Error ;an000;bgb
Public ExitStatus ;an000;bgb
Public PSP_Segment ;an000;bgb
ifdef fsexec ;an038;bgb
Public FS_String_Buffer ;an038;bgb
endif ;an038;bgb
; ;an000;bgb
;***************************************************************************** ;an000;bgb
; External Data Declarations ;an000;bgb
;***************************************************************************** ;an000;bgb
EXTRN movsi:word ;move si pointer here for display of invalid parm ;an046;bgb;an000;bgb;an005;bgb
EXTRN fatcnt:Byte ;an000;bgb;an005;bgb
EXTRN AllDrv:Byte ;an000;bgb
EXTRN VolNam:Byte ;an000;bgb
EXTRN BadDrvM:Byte ;an000;bgb
EXTRN OrphFCB:Byte ;an000;bgb
EXTRN Arg_Buf:Byte ;an000;bgb
EXTRN Noisy:Byte ;an000;bgb
EXTRN DoFix:Byte ;an000;bgb
EXTRN SubstErr:Byte ;an000;bgb
EXTRN No_Net_Arg:Byte ;an000;bgb
EXTRN UserDev:Byte ;an000;bgb
EXTRN BadDrv_Arg:Byte ;an000;bgb
EXTRN TranSrc:Byte ;an000;bgb
EXTRN ContCh:Word ;an000;bgb
EXTRN HardCh:Word ;an000;bgb
EXTRN Fragment:Byte ;an000;bgb
EXTRN Parse_Error_Msg:Byte ;an000;bgb
EXTRN Chkprmt_End:Byte ;an000;bgb
extrn save_drive:byte ;an000;bgb
EXTRN Read_Write_Relative:Byte ;an000;bgb
EXTRN inval_media:byte ;an000;bgb;an033;bgb
data ends ;an000;bgb
;an000;bgb
;an000;bgb
code segment public para 'CODE' ;an000;bgb
;***************************************************************************** ;an000;bgb
; External Routine Declarations ;an000;bgb
;***************************************************************************** ;an000;bgb
ifdef fsexec ;an038;bgb
EXTRN Exec_FS_CHKDSK:Near ;an000;bgb
endif
EXTRN SysLoadMsg:Near ;an000;bgb
EXTRN SysDispMsg:Near ;an000;bgb
EXTRN Done:Near ;an000;bgb
EXTRN Main_Routine:Near ;an000;bgb
EXTRN INT_23:Near ;an000;bgb
EXTRN INT_24:Near ;an000;bgb
EXTRN Path_Name:Near ;an000;bgb
extrn read_once:near ;an000;bgb
public p97, multiply_32_bits ;an000;bgb
public func60 ;an000;bgb
public hook_interrupts ;an000;bgb
public get_bpb ;an000;bgb
pathlabl chkinit ;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Main_Init ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Main control routine for init section ;an000;bgb
; ;an000;bgb
;Called Procedures: Check_DOS_Version ;an000;bgb
; Init_Input_Output ;an000;bgb
; Validate_Target_Drive ;an000;bgb
; Hook_Interrupts ;an000;bgb
; Clear_Append_X ;an000;bgb
; CHKDSK_IFS ;an000;bgb
; Reset_Append_X ;an000;bgb
; ;an000;bgb
;Input: None ;an000;bgb
; ;an000;bgb
;Output: None ;an000;bgb
; ;an000;bgb
;Change History: Created 5/8/87 MT ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Set segregs to DATA ;an000;bgb
; Get segment of PSP ;an000;bgb
; Fatal_Error = NO ;an000;bgb
; Flush all buffers (INT 21h AH=0Dh) ;an000;bgb
; Parse input and load messages (CALL Init_Input_Output) ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; Check target drive letter (CALL Validate_Target_Drive) ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; Set up Control Break (CALL Hook_Interrupts) ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; CALL Clear_Append_X ;an000;bgb
; CALL CHKDSK_IFS ;an000;bgb
; CALL Reset_Append_X ;an000;bgb
; ENDIF ;an000;bgb
; ENDIF ;an000;bgb
; ENDIF ;an000;bgb
; Exit program ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Main_Init ; ;an000;bgb;AN000;
Set_Data_Segment ;Setup addressibility ;an000;bgb;AN000;
call get_psp ;an000;bgb
;;;;;;;;DOS_Call GetCurrentPSP ;Get PSP segment address ;an000;bgb;ac034;bgb
;;;;;;;;mov PSP_Segment,bx ;Save it for later ;an000;bgb;ac034;bgb
mov Fatal_Error,No ;Init the error flag ;an000;bgb;AN000;
Dos_Call Disk_Reset ;Flush all buffers ;an000;bgb
call Init_IO ;Setup messages and parse ;an000;bgb;AN000;
cmp Fatal_Error,Yes ;Error occur? ;an000;bgb;AN000;
; $IF NE ;Nope, keep going ;an000;bgb;AN000;
JE $$IF1
call Validate_Target_Drive ;Check drive letter ;an000;bgb;AN000;
cmp Fatal_Error,Yes ;Error occur? ;an000;bgb;AN000;
; $IF NE ;Nope, keep going ;an000;bgb;AN000;
JE $$IF2
;;;;;;;;;;;;;;call Hook_Interrupts ;Set CNTRL -Break hook ;an000;bgb;AN000;
call Clear_Append_X ; ;an000;bgb;AN000;
call CHKDSK_IFS ;Chkdsk correct file system ;an000;bgb;AN000;
call Reset_Append_X ; ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF2:
; $ENDIF ; ;an000;bgb;AN000;
$$IF1:
mov al,ExitStatus ;Get Errorlevel ;an000;bgb;AN000;
DOS_Call Exit ;Exit program ;an000;bgb;AN000;
int 20h ;If other exit fails ;an000;bgb;AN000;
Main_Init endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: get_psp ;an000;bgb
;***************************************************************************** ;an000;bgb
;Description: get info from the psp area ;an000;bgb
; ;an000;bgb
;Called Procedures: get_drive ;an000;bgb
; ;an000;bgb
;Change History: Created 8/7/87 bgb ;an000;bgb
; ;an000;bgb
;Input: none ;an000;bgb
; ;an000;bgb
;Output: psp_segment ;an000;bgb
; command_line_buffer ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; get addr of psp ;an000;bgb
; move command line into data seg ;an000;bgb
; get drive number of target ;an000;bgb
; get addr of data seg ;an000;bgb
; call get_drive ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
Procedure get_psp ;;AN000; ;an000;bgb
;;;;;;;;DOS_Call GetCurrentPSP ;Get PSP segment address :AN035;b;an000;bgbgb
;;;;;;;;mov PSP_Segment,bx ;Save it for later ;AN035;b;an000;bgbgb
; get command line from psp ;an000;bgb;AN000;bgb
mov cx,PSP_Segment ;point ds to data seg ;an000;bgb;AN000;bgb
mov ds,cx ; " " " " " ;an000;bgb;AN000;bgb
assume ds:NOTHING,es:dg ; " " " " " ;an000;bgb;AN000;bgb
; get the drive number of the target from the psp (0=default, a=1, b=2, c=3) ;AN;an000;bgb000;bgb
mov bl,ds:[FCB1] ;Get target drive from FCB -74 ;AN0;an000;bgb00;
Set_Data_Segment ;Set DS,ES to Data segment ;AN0;an000;bgb00;bgb
call get_drive ;an000;bgb
ret ;an000;bgb
get_psp endp ; ;AN000; ;an000;bgb
;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: get_drive ;an000;bgb
;***************************************************************************** ;an000;bgb
;Description: get drive letter from reg bl ;an000;bgb
; ;an000;bgb
;Change History: Created 8/7/87 bgb ;an000;bgb
; ;an000;bgb
;Input: bl = drive num (default=0) ;an000;bgb
; ;an000;bgb
;Output: driveletter ;an000;bgb
; user_drive ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; IF drive-num = default ;an000;bgb
; get default drive number (a=1) ;an000;bgb
; convert to letter ;an000;bgb
; ELSE ;an000;bgb
; convert to letter ;an000;bgb
; ENDIF ;an000;bgb
; move letter into data areas ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
Procedure get_drive ;;AN000; ;an000;bgb
; convert drive number to drive letter ;an000;bgb
cmp bl,0 ;a=1 b=2 c=3 ;Is it default drive? 0=default ;AN000; ;an000;bgb
; $IF E ;Yes, turn it into drive letter ;AN000; ;an000;bgb
JNE $$IF5
; get default drive number ;an000;bgb
DOS_Call Get_Default_Drive ;Get default drive num in al ;AN00;an000;bgb0;
;a=0, b=1, c=2 ;an000;bgb
; $ELSE ;Not default, A=1 ;AN000; ;an000;bgb
JMP SHORT $$EN5
$$IF5:
; bl already contains the correct drive number - save it ;an000;bgb
dec bl ;make it zero based ;an000;bgb
mov al,bl ;an000;bgb
; $ENDIF ; 74+40=b4 ;an000;bgb
$$EN5:
mov BadDrvm+1,al ; " " " " ;an000;bgb ;AN000;
inc al ;an000;bgb
mov byte ptr Buffer.drnum_stroff,al ; ;an000;bgb ;
mov AllDrv,al ; ;an000;bgb ;AC000;
mov VolNam,al ; ;an000;bgb ;AC000;
mov OrphFCB,al ; ;an000;bgb ;AC000;
dec al ;an000;bgb
add al,"A" ;convert it to letter ;AN000; ;an000;bgb
mov arg_buf,al ;set up prompt msg ;AN0;an000;bgb00;bgb
ret ;an000;bgb
get_drive endp ; ;AN000; ;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Init_Input_Output ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;description: Initialize messages, Parse command line if FAT file system ;an000;bgb
; ;an000;bgb
;Called Procedures: Preload_Messages ;an000;bgb
; Parse_Command_Line ;an000;bgb
; ;an000;bgb
;Change History: Created 5/10/87 MT ;an000;bgb
; ;an000;bgb
;Input: PSP command line at 81h and length at 80h ;an000;bgb
; ;an000;bgb
;Output: FS_Not_FAT = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; FS_Not_FAT = NO ;an000;bgb
; Load messages (CALL Preload_Messages) ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; Get file system type (INT 21h AX=440Dh, CX=084Eh GET MEDIA_ID) ;an000;bgb
; IF CY (Old type diskette),OR ;an000;bgb
; IF "FAT_12 ",OR ;an000;bgb
; IF "FAT_16 " ;an000;bgb
; CALL Parse_Command_Line ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; Interpret_Parse ;an000;bgb
; ENDIF ;an000;bgb
; ELSE ;an000;bgb
; Get drive letter only (CALL Parse_Drive_Letter) ;an000;bgb
; FS_Not_FAT = YES ;an000;bgb
; ENDIF ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Init_IO ; ;AN000; ;an000;bgb
;an000;bgb
call Preload_Messages ;Load up message retriever ;an000;bgb;AN000;
ifdef fsexec ;an038;bgb
mov FS_Not_FAT,No ;an038;bgb
cmp Fatal_Error,YES ;Quit? ;an038;bgb;AN000;
; $IF NE ;Nope, keep going ;an038;bgb;AN000;
JE $$IF8
mov al,GENERIC_IOCTL ;Generic IOCtl call ;an038;bgb;AN000;
push ds ; ;an038;bgb;AN000;
mov bx,PSP_Segment ; ;an038;bgb;AN000;
mov ds,bx ; ;an038;bgb;AN000;
assume ds:nothing ; ;an038;bgb;AN000;
;an038;bgb
mov bl,ds:FCB1 ;Get drive (A=1) ;an038;bgb;AN000;
;an038;bgb
pop ds ; ;an038;bgb;AN000;
assume ds:dg ; ;an038;bgb;AN000;
xor bh,bh ;Set bh=0 ;an038;bgb;AN000;
mov ch,RawIO ;Get Media ID call ;an038;bgb;AN000;
mov cl,GET_MEDIA_ID ; ;an038;bgb;AN000;
lea dx,Media_ID_Buffer ;Point at buffer ;an038;bgb;AN000;
DOS_Call IOCtl ;Do function call ;an038;bgb;AN000;
; $IF C,OR ;Old style diskette, OR ;an038;bgb;AN000;
JC $$LL9
lea si,FAT12_String ;Check for FAT_12 string ;an038;bgb;AN000;
lea di,Media_ID_Buffer.Media_ID_File_System ; ;AN000;;an038;bgb
mov cx,Len_FS_ID_String ;Length of compare ;an038;bgb;AN000;
repe cmpsb ;Find it? ;an038;bgb;AN000;
; $IF E,OR ;Nope, keep going ;an038;bgb;AN000;
JE $$LL9
lea si,FAT16_String ;Check for FAT_16 string ;an038;bgb;AN000;
lea di,Media_ID_Buffer.Media_ID_File_System ; ;AN000;;an038;bgb
mov cx,Len_FS_ID_String ;Length of compare ;an038;bgb;AN000;
repe cmpsb ;Do compare ;an038;bgb;AN000;
; $IF E ;Find it? ;an038;bgb;AN000;
JNE $$IF9
$$LL9:
endif ;an038;bgb
call Parse_Command_Line ;Parse in command line input ;an038;bgb;AN000;
ifdef fsexec ;an038;bgb
; $ELSE ;We got FS other than FAT ;an038;bgb;AN000;
JMP SHORT $$EN9
$$IF9:
;;;;;;;;;;;;;;call Parse_Drive_Letter ;Only look for drive letter ;an038;bgb;AN000;
mov FS_Not_FAT,Yes ;Indicate exec file system ;an038;bgb;AN000;
mov cx,8 ;an038;bgb;an027;bgb
lea si,Media_ID_Buffer.Media_ID_File_System ;get file system;an038;bgb ;an027;bgb
lea di,fs_string_buffer ;put it here ;an038;bgb;an027;bgb
rep movsb ;an038;bgb;an027;bgb
lea di,fs_string_buffer ;point to beginning again ;an038;bgb;an027;bgb
; $DO COMPLEX ;search th string until eol found ;an038;bgb;an027;bgb
JMP SHORT $$SD11
$$DO11:
inc di ;next char ;an038;bgb;an027;bgb
; $STRTDO ;start loop here ;an038;bgb;an027;bgb
$$SD11:
cmp byte ptr [di],' ' ;end of string ? ;an038;bgb;an027;bgb
; $ENDDO E ;end loop when eol found ;an038;bgb;an027;bgb
JNE $$DO11
lea si,fs_string_end ;get end of string - rec.exe ;an038;bgb;an027;bgb
mov cx,8 ; 8 more chars ;an038;bgb;an027;bgb
rep movsb ;move it in ;an038;bgb;an027;bgb
; $ENDIF ; ;an038;bgb;AN000;
$$EN9:
; $ENDIF ; ;an038;bgb;AN000;
$$IF8:
endif ;an038;bgb
ret ; ;an000;bgb;AN000;
;an000;bgb
Init_IO endp ; ;AN000; ;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Preload_Messages ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Preload messages using common message retriever routines. ;an000;bgb
; ;an000;bgb
;Called Procedures: SysLoadMsg ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Fatal_Error = NO ;an000;bgb
; ;an000;bgb
;Output: Fatal_Error = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Preload All messages (Call SysLoadMsg) ;an000;bgb
; IF error ;an000;bgb
; Display SysLoadMsg error message ;an000;bgb
; Fatal_Error = YES ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Preload_Messages ; ;an000;bgb;AN000;
; ;an000;bgb
call SysLoadMsg ;Preload the messages ;an000;bgb;AN000;
; $IF C ;Error? ;an000;bgb;AN000;
JNC $$IF16
call SysDispMsg ;Display preload msg ;an000;bgb;AN000;
mov Fatal_Error, YES ;Indicate error exit ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF16:
ret ; ;an000;bgb;AN000;
;an000;bgb
Preload_Messages endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Parse_Drive_Letter ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Copy the command line - then parse looking only for drive ;an000;bgb
; letter. Ignore errors, because this is only called to get ;an000;bgb
; the drive letter for non-FAT chkdsk ;an000;bgb
; ;an000;bgb
;Called Procedures: SysParse ;an000;bgb
; ;an000;bgb
;Change History: Created 5/12/87 MT ;an000;bgb
; ;an000;bgb
;Input: Command line input at 81h ;an000;bgb
; ;an000;bgb
;Output: None ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; Copy command line to buffer ;an000;bgb
; DO ;an000;bgb
; Parse buffer line (CALL SysParse) using drive letter only tables ;an000;bgb
; LEAVE end of parse ;an000;bgb
; ENDDO missing operand ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
;Procedure Parse_Drive_Letter ; ;an000;bgb;AN000;
; Set_Data_Segment ;Set DS,ES to Data segment ;an000;bgb;AN000;
; mov cx,PSP_Segment ;Get segment of PSP ;an000;bgb;AN000;
; mov ds,cx ; " " " " ;an000;bgb;AN000;
; assume ds:nothing ; ;an000;bgb;AN000;
; mov si,Command_Line_Parms ;Point to command line ;an000;bgb;AN000;
; lea di,Command_Line_Buffer ;Point to buffer to save to ;an000;bgb;AN000;
; mov cx,Command_Line_Length ;Number of bytes to move ;an000;bgb;AN000;
; rep movsb ;Copy the entire buffer ;an000;bgb;AN000;
; Set_Data_Segment ; ;an000;bgb;AN000;
; lea si,Command_Line_Buffer ;Pointer to parse line ;an000;bgb;AN000;
; lea di,input_table ;Pointer to control table ;an000;bgb;AN000;
; $DO ;Parse for drive letter ;an000;bgb;AN000;
; xor dx,dx ;Parse line @SI ;an000;bgb;AN000;
; xor cx,cx ;Parse table @DI ;an000;bgb;AN000;
; call SysParse ;Go parse ;an000;bgb;AN000;
; cmp ax,End_Of_Parse ;Check for end of parse ;an000;bgb;AN000;
; $LEAVE E ;In other words, no drive letter;an000;bgb;AN000;
; cmp ax,Operand_Missing ; exit if positional missing ;an000;bgb;AN000;
; $ENDDO E ;Ignore errors!!! ;an000;bgb;AN000;
; Set_Data_Segment ; ;an000;bgb;AN000;
; ret ; ;an000;bgb;AN000;
; ;an000;bgb
;Parse_Drive_Letter endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Parse_Command_Line ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Parse the command line. Check for errors, and display error and ;an000;bgb
; exit program if found. Use parse error messages except in case ;an000;bgb
; of no parameters, which has its own message ;an000;bgb
; ;an000;bgb
;Called Procedures: Message (macro) ;an000;bgb
; SysParse ;an000;bgb
; Interpret_Parse ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Fatal_Error = NO ;an000;bgb
; PSP_Segment ;an000;bgb
; ;an000;bgb
;Output: Fatal_Error = YES/NO ;an000;bgb
; Parse output buffers set up ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; SEARCH ;an000;bgb
; Parse command line (CALL SysParse) ;an000;bgb
; EXITIF end of parsing command line ;an000;bgb
; Figure out last thing parsed (Call Interpret_Parse) ;an000;bgb
; ORELSE ;an000;bgb
; See if parse error ;an000;bgb
; ENDLOOP parse error ;an000;bgb
; See what was parsed (Call Interpret_Parse) ;an000;bgb
; Fatal_Error = YES ;an000;bgb
; ENDSRCH ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Parse_Command_Line ; ;an000;bgb;AN000;
;an000;bgb
push ds ;Save data segment ;an000;bgb;AN000;
Set_Data_Segment ; ;an000;bgb;AN000;
mov cx,PSP_Segment ;Get segment of PSP ;an000;bgb;AN000;
mov ds,cx ; " " " " ;an000;bgb;AN000;
;an000;bgb
assume ds:nothing,es:dg ; ;an000;bgb;AN000;
;an000;bgb
mov si,Command_Line_Parms ;Point at command line ;an000;bgb;AN000;
lea di,Command_Line_Buffer ;Where to put a copy of it ;an000;bgb;AN000;
mov cx,Command_Line_Length ;How long was input? ;an000;bgb;AN000;
repnz movsb ;Copy it ;an000;bgb;AN000;
lea Di,Command_Line_Buffer ; ;an046;bgb
public nextdi ;an046;bgb
nextdi: ;an046;bgb
mov al,0dh ;search for end of line ;an046;bgb
cmp al,ES:[Di] ;zero terminate string ;an046;bgb
; $IF NZ ;an046;bgb
JZ $$IF18
inc di ;an046;bgb
jmp nextdi ;an046;bgb
; $ELSE ;an046;bgb
JMP SHORT $$EN18
$$IF18:
mov byte ptr ES:[di+1],00 ;an046;bgb
; $ENDIF ;an046;bgb
$$EN18:
;an046;bgb
Set_Data_Segment ;Set DS,ES to Data segment ;an000;bgb;AN000;
xor cx,cx ; ;an000;bgb;AN000;
xor dx,dx ;Required for SysParse call ;;an000;bgbAN000;
lea si,Command_Line_Buffer ;Pointer to parse line ;an000;bgb ;AN000;
lea di,input_table ;Pointer to control table ;an000;bgb ;AN000;
; $SEARCH ;Loop until all parsed ;an000;bgb;AN000;
$$DO21:
cmp Fatal_Error,Yes ;Interpret something bad? ;an000;bgb;AN000;
; $EXITIF E,OR ;If so, don't parse any more ;an000;bgb;AN000;
JE $$LL22
call SysParse ;Go parse ;an000;bgb;AN000;
cmp ax,End_Of_Parse ;Check for end of parse ;an000;bgb;AN000;
; $EXITIF E ;Is it? ;an000;bgb;AN000;
JNE $$IF21
$$LL22:
;All done ;an000;bgb;AN000;
; $ORELSE ;Not end ;an000;bgb;AN000;
JMP SHORT $$SR21
$$IF21:
cmp ax,0 ;Check for parse error ;an000;bgb;AN000;
; $LEAVE NE ;Stop if there was one ;an000;bgb;AN000;
JNE $$EN21
call Interpret_Parse ;Go find what we parsed ;an000;bgb;AN000;
; $ENDLOOP ;Parse error, see what it was ;an000;bgb;AN000;
JMP SHORT $$DO21
$$EN21:
dec si ;point to last byte of invalid parm
public decsi
decsi: cmp byte ptr [si],' ' ;are we pointing to a space? ;an046;bgb
; $IF E,OR ;if so, we dont want to do that
JE $$LL26
cmp byte ptr [si],0dh ;are we pointing to CR? ;an046;bgb
; $IF E ;if so, we dont want to do that
JNE $$IF26
$$LL26:
dec si ;find the last byte of parm
jmp decsi
; $ENDIF
$$IF26:
mov byte ptr [si+1],00 ;zero terminate display string ;an046;bgb
nextsi:
public nextsi
dec si ;look at previous char ;an046;bgb
cmp byte ptr [si],' ' ;find parm separator ;an046;bgb
jnz nextsi ;loop until begin of parm found
mov movsi,si ;mov si into display parms ;an046;bgb
PARSE_MESSAGE ;Display parse error ;an000;bgb;AN000;
mov Fatal_Error,YES ;Indicate death! ;an000;bgb;AN000;
; $ENDSRCH ; ;an000;bgb;AN000;
$$SR21:
pop ds ; ;an000;bgb;AN000;
ret ; ;an000;bgb;AN000;
;an000;bgb
Parse_Command_Line endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Interpret_Parse ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;description: Get any switches entered, and dr ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Called Procedures: Message (macro) ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: DS:DrNum (FCB at 5Ch) ;an000;bgb
; ;an000;bgb
;Output: Noisy = ON/OFF ;an000;bgb
; DoFix = ON/OFF ;an000;bgb
; ALLDRV = Target drive, A=1 ;an000;bgb
; VOLNAM = Target drive, A=1 ;an000;bgb
; ORPHFCB = Target drive, A=1 ;an000;bgb
; BADDRVm+1 = Target drive, A=0 ;an000;bgb
; Arg_Buf = Target drive letter ;an000;bgb
; Fragment > 1 if filespec entered ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Noisy = OFF ;an000;bgb
; DoFix = OFF ;an000;bgb
; IF /V ;an000;bgb
; Noisy = ON ;an000;bgb
; ENDIF ;an000;bgb
; IF /F ;an000;bgb
; DoFix = ON ;an000;bgb
; ENDIF ;an000;bgb
; IF file spec entered ;an000;bgb
; Build filename ;an000;bgb
; Fragment = 1 ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Interpret_Parse ; ;an000;bgb;AN000;
;an000;bgb
push ds ;Save segment ;an000;bgb;AN000;
push si ;Restore SI for parser ;an000;bgb;AN000;
push cx ; ;an000;bgb;AN000;
push di ; ;an000;bgb
Set_Data_Segment ; ;an000;bgb
cmp byte ptr Buffer.dfType,Type_Drive ;Have drive letter? ;AN000; ;an000;bgb
; $IF E ;Yes, save info ;an000;bgb;AN000;
JNE $$IF29
and word ptr dfcontrol,filespec ;dont let another drive letter ;an000;bgb
mov al,byte ptr Buffer.Drnum_stroff ;Get drive entered ;;an000;bgbAN000;
mov AllDrv,al ; ;an000;bgb;AC000;
mov VolNam,al ; ;an000;bgb;AC000;
mov OrphFCB,al ; ;an000;bgb;AC000;
dec al ;Make it 0 based ;an000;bgb;AN000;
mov BadDrvm+1,al ; " " " " ;an000;bgb;AN000;
add al,'A' ;Make it a drive letter ;an000;bgb;AN000;
mov Arg_Buf,al ;Save it ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF29:
cmp SwBuffer.Switch_Pointer,offset Sw_v ;AN020;;an000;bgbbgb
; $IF E ; ;an000;bgb;AN000;
JNE $$IF31
mov Noisy,ON ;Set flag ;an000;bgb;AC000;
mov byte ptr sw_v,blank ;an000;bgb;an020;bgb
; $ENDIF ; ;an000;bgb;AN000;
$$IF31:
cmp SwBuffer.Switch_Pointer,offset sw_f ;AN020;;an000;bgbbgb
; $IF E ; ;an000;bgb;AN000;
JNE $$IF33
mov DoFix,ON ;Set flag ;an000;bgb;AC000;
mov byte ptr sw_f,blank ;;an000;bgban020;bgb
; $ENDIF ; ;an000;bgb;AN000;
$$IF33:
;;;;;;; cmp FileSpec_Buffer.FileSpec_Pointer,offset FileSpec_Control.Keyword;an000;bgb ;AN000;
cmp buffer.dftype, type_filespec ;an000;bgb
; $IF E ; ;an000;bgb;AN000;
JNE $$IF35
mov word ptr dfcontrol,0 ;dont let another drive letter or filesp;an000;bgbec
mov si,Buffer.drnum_StrOff ; ;AN000; ;an000;bgb
lea di,Path_Name ;Point to where to build path ;an000;bgb;AN000;
cld ;SI-DI dir is up ;an000;bgb;AN000;
; $DO ;Move string one char at a time ;an000;bgb;AN000;
$$DO36:
cmp byte ptr [si],Asciiz_End ;Is it the end? ;an000;bgb;AN000;
; $LEAVE E ;You got it ;an000;bgb;AN000;
JE $$EN36
movsb ;Nope, move the character ;an000;bgb;AN000;
; $ENDDO ;And keep crusin ;an000;bgb;AN000;
JMP SHORT $$DO36
$$EN36:
inc fragment ;To be compat with old code ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF35:
pop di ;Restore parse regs ;an000;bgb;AN000;
pop cx ; ;an000;bgb;AN000;
pop si ; ;an000;bgb;AN000;
pop ds ; ;an000;bgb;AN000;
ret ; ;an000;bgb;AN000;
;an000;bgb
;an000;bgb
Interpret_Parse endp ; ;an000;bgb;AN000;
;an000;bgb
;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Validate_Target_Drive ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Control routine for validating the specified format target drive. ;an000;bgb
; If any of the called routines find an error, they will print ;an000;bgb
; message and terminate program, without returning to this routine ;an000;bgb
; ;an000;bgb
;Called Procedures: Check_Target_Drive ;an000;bgb
; Check_For_Network ;an000;bgb
; Check_Translate_Drive ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Fatal_Error = NO ;an000;bgb
; ;an000;bgb
;Output: Fatal_Error = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; CALL Check_Target_Drive ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; CALL Check_For_Network ;an000;bgb
; IF !Fatal_Error ;an000;bgb
; CALL Check_Translate_Drive ;an000;bgb
; ENDIF ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Validate_Target_Drive ; ;an000;bgb;AN000;
call Check_For_Network ;See if Network drive letter ;an000;;an043;bgbbgb;AN000;
cmp Fatal_Error,YES ;Can we continue? ;an0;an043;bgb00;bgb;AN000;
; $IF NE ;Yep ;an0;an043;bgb00;bgb;AN000;
JE $$IF40
call Check_Target_Drive ;See if valid drive letter ;an000;bgb;AN000;
cmp Fatal_Error,YES ;Can we continue? ;an000;bgb;AN000;
; $IF NE ;Yep ;an000;bgb;AN000;
JE $$IF41
call Check_For_Network ;See if Network drive letter ;an000;bgb;AN000;
cmp Fatal_Error,YES ;Can we continue? ;an000;bgb;AN000;
; $IF NE ;Yep ;an000;bgb;AN000;
JE $$IF42
call Check_Translate_Drive ;See if Subst, Assigned ;an000;bgb;AN000;
; $ENDIF ;- Fatal_Error passed back ;an000;bgb;AN000;
$$IF42:
; $ENDIF ; ;an000;bgb;AN000;
$$IF41:
; $ENDIF ;an000;bgb
$$IF40:
ret ; ;an000;bgb;AN000;
;an000;bgb
Validate_Target_Drive endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Check_Target_Drive ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Check to see if valid DOS drive by checking if drive is ;an000;bgb
; removable. If error, the drive is invalid. Save default ;an000;bgb
; drive info. Also get target drive BPB information, and compute ;an000;bgb
; the start of the data area ;an000;bgb
; ;an000;bgb
;Called Procedures: Message (macro) ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Fatal_Error = NO ;an000;bgb
; ;an000;bgb
;Output: BIOSFile = default drive letter ;an000;bgb
; DOSFile = default drive letter ;an000;bgb
; CommandFile = default drive letter ;an000;bgb
; Fatal_Error = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Get default drive (INT 21h, AH = 19h) ;an000;bgb
; Convert it to drive letter ;an000;bgb
; Save into BIOSFile,DOSFile,CommandFile ;an000;bgb
; See if drive removable (INT 21h, AX=4409h IOCtl) ;an000;bgb
; IF error - drive invalid ;an000;bgb
; Display Invalid drive message ;an000;bgb
; Fatal_Error= YES ;an000;bgb
; ENDIF ;an000;bgb
; Get BPB of target drive (Generic IOCtl Get Device parameters) ;an000;bgb
; Compute start of data area ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
Procedure Check_Target_Drive ; ;an000;bgb;AN000;
call func60 ; ;an000;bgb
mov al,save_drive ;an000;bgb
cmp al,0ffh ;save drive spec ;an000;bgb
; $IF E ;an000;bgb
JNE $$IF46
Message BadDrv_Arg ;Print message ;an000;bgb;AC000;
mov Fatal_Error,Yes ;Indicate error ;an000;bgb;AN000;
jmp Exit_Baddrv ;dont do rest of proc ;an000;bgb;an021;bgb;an099;
; $ENDIF ;an000;bgb
$$IF46:
DOS_Call Get_Default_Drive ;Find the current drive 19 ;an000;bgb;AC000;
mov UserDev,al ;Save it ;an000;bgb; ;
cmp AllDrv,0 ;Was drive entered? ;an000;bgb;AN002;
; $IF E ;No ;an000;bgb;AN002;
JNE $$IF48
mov BadDrvm+1,al ;Save 0 based number ;an000;bgb;AN002;
inc al ;Make 1 based ;an000;bgb;AN002;
mov byte ptr Buffer.Drnum_stroff,al ; ;an000;bgb ;
mov AllDrv,al ;Use default drive for ;an000;bgb;AN002;
mov VolNam,al ;entries for drive fields ;an000;bgb;AN002;
mov OrphFCB,al ; ;an000;bgb;AN002;
add al,'A'-1 ;Make it a drive letter ;an000;bgb;AN002;
mov Arg_Buf,al ;Save it ;an000;bgb;AN002;
; $ENDIF ; ;an000;bgb;AN002;
$$IF48:
mov bl,alldrv ;Get drive number (A=1) ;AN00;an044;bgb;an000;bgb0;
mov al,09h ;See if drive is local ;an000;bgb;AC000;
DOS_Call IOCtl ;-this will fail if bad drive ;an000;bgb;AC000;
; $IF C ;CY means invalid drive ;an000;bgb;AC000;
JNC $$IF50
Message BadDrv_Arg ;Print message ;an000;bgb;AC015;bgb
mov Fatal_Error,Yes ;Indicate error ;an000;bgb;AN015;bgb
; $ENDIF ; ;an000;bgb;AN000;
$$IF50:
cmp fatal_error,no ;an000;bgb
; $IF E ;an000;bgb
JNE $$IF52
get_bpb: mov al,GENERIC_IOCTL ;Get BPB information ;an000;bgb ;AN000;
mov ch,RawIO ; " " " " ;an000;bgb ;AN000;
mov cl,GET_DEVICE_PARAMETERS ; ;an000;bgb ;AN000;
mov bl,AllDrv ; " " " " ;an000;bgb ;AN000;
lea dx,BPB_Buffer ; dx points to bpb area ;an000;bgb ;AN000;
mov byte ptr bpb_buffer, 0ffh ;turn bit 0 on to get bpb inf;an000;bgbo of disk ;an008;bgb
DOS_Call IOCtl ; " " " " ;an000;bgb ;AN000;
mov bx,dx ;use bx as the pointer to bpb;an000;bgb ;an015;bgb
; $IF C ;is ioct not supported or bad? ;an000;bgb ;an015;bgb
JNC $$IF53
mov al,BadDrvm+1 ; drive number a=0 ;an000;bgb ;AN015;bgb
lea bx,chkprmt_end ; transfer address es:bx ;an000;bgb ;an015;bgb
;warning! this label must be the last in the code segment ;an000;bgb
mov cx,1 ; 1 sector - boot record ;an000;bgb ;an015;bgb
mov dx,0 ; logical sector 0 ;an000;bgb ;an015;bgb
mov Read_Write_Relative.Start_Sector_High,0 ; ;an000;bgb ;an015;bgb
call read_once ;an000;bgb ;an015;bgb
; $IF C ;couldnt read the boot? ;an000;bgb ;an015;bgb
JNC $$IF54
Message BadDrv_Arg ;Print message ;an000;bgb ;AC015;bgb
mov Fatal_Error,Yes ;Indicate error ;an000;bgb ;AN015;bgb
; $ELSE ;ioct not supported - is it vdisk ;an000;bgb ;an015;bgb
JMP SHORT $$EN54
$$IF54:
; mov di,bx ;an000;bgb;an022;bgb
; add di,3 ;es:di --> to vdisk area in boot rcd ;an000;bgb;an022;bgb
; lea si,myvdisk ;ds:si --> proper vdisk string ;an000;bgb;an022;bgb
; mov cx,5 ; compare 5 bytes ;an000;bgb;an022;bgb
; repe cmpsb ;compare both strings ;an000;bgb;an022;bgb
IF IBMCOPYRIGHT
; $IF NE ;an000;bgb;an022;bgb
; jmp baddrv ;an000;bgb
; $ENDIF ;an000;bgb;an022;bgb
ELSE
; $IF NE
mov di,bx
add di,3
lea si,myramdisk
mov cx,8
repe cmpsb
; $IF NE
JE $$IF56
jmp baddrv
; $ENDIF
$$IF56:
; $ENDIF
ENDIF
; $ENDIF ;an000;bgb;an022;bgb
$$EN54:
add bx,4 ;boot-record-offset - device-paramete;an000;bgbr offset ;an015;bgb
; $ENDIF ;an000;bgb ;an015;bgb
$$IF53:
; $ENDIF ;an000;bgb
$$IF52:
cmp fatal_error,no ;an000;bgb
; $IF E ;an000;bgb
JNE $$IF61
call get_boot_info ;an053;bgb
call calc_space ;an000;bgb
; $ENDIF ;an000;bgb
$$IF61:
cmp bytes_per_sector,0 ;an000;bgb;an033;bgb
; $IF E ;an000;bgb;an033;bgb
JNE $$IF63
baddrv: mov fatal_error,yes ;an000;bgb;an033;bgb
mov dx,offset dg:inval_media ;an000;bgb;an033;bgb
invoke printf_crlf ;an000;bgb;an033;bgb
; $ENDIF ;an000;bgb;an033;bgb
$$IF63:
Exit_Baddrv: ;AN099;
ret ;And we're outa here ;an000;bgb;AN000;
Check_Target_Drive endp ; ;an000;bgb;AN000;
;an000;bgb
;an000;bgb
;****************************************************************************** ;an053;bgb;an000;bgb
; get_boot_info ;an053;bgb
; ;an053;bgb
; ;an053;bgb;an000;bgb
; Inputs : none ;an053;bgb;an000;bgb
; ;an053;bgb;an000;bgb
; Outputs : ;an053;bgb
;****************************************************************************** ;an053;bgb;an000;bgb
Procedure get_boot_info ; ;an053;bgb;an000;bgb
mov cx,[bx].BytePerSector ; usually 512 ;an053;bgb;an000;bgb ;an015;bgb
cmp cx,512 ;vdisk sizes ;an053;bgb
; $IF NE,AND ;vdisk sizes ;an053;bgb
JE $$IF65
cmp cx,256 ;vdisk sizes ;an053;bgb
; $IF NE,AND ;vdisk sizes ;an053;bgb
JE $$IF65
cmp cx,128 ;vdisk sizes ;an053;bgb
; $IF NE ;vdisk sizes ;an053;bgb
JE $$IF65
jmp baddrv ;an053;bgb
; $ENDIF ;an053;bgb
$$IF65:
mov bytes_per_sector,cx ; ; ;an053;bgb;an000;bgb ;an005;bgb
;an053;bgb
xor cx,cx ;Find # sectors used by FA;an053;bgb;an000;bgbT's ;AN000;
mov cl,[bx].NumberOfFats ; " " " " ;an053;bgb;an000;bgb ;an015;bgb
cmp cx,2 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF67
cmp cx,1 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE ;an053;bgb
JE $$IF67
jmp baddrv ;must be 2 fats ;an053;bgb ;an032;bgb
; $ENDIF ;an053;bgb
$$IF67:
mov fatcnt,cl ;an053;bgb;an000;bgb ;an005;bgb
;an053;bgb
;an053;bgb
xor ax,ax ;an053;bgb
mov al,[bx].SectorsPerCluster ;get total sectors ;an053;bgb ;an000;bgb;an015;bgb
cmp ax,1 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,2 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,4 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,8 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,16 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,32 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,64 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE,AND ;an053;bgb
JE $$IF69
cmp ax,128 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF NE ;an053;bgb
JE $$IF69
jmp baddrv ;this is not! ;an053;bgb ;an032;bgb
; $ENDIF ;an053;bgb
$$IF69:
;an053;bgb
mov ax,[bx].SectorsPerFAT ; " " " " ;an053;bgb;an000;bgb ;an015;bgb
cmp ax,0 ;make sure it is ok ;an053;bgb;an032;bgb
jz baddrv ;this is not! ;an053;bgb;an032;bgb
mul cx ; " " " " ;an053;bgb;an000;bgb ;AN000;
push bx ;save bpb pointer ;an053;bgb;an000;bgb ;an015;bgb
push dx ;Save results ;an053;bgb;an000;bgb ;AN000;
push ax ; " " ;an053;bgb;an000;bgb ;AN000;
;an053;bgb
mov ax,[bx].RootEntries ;Find number of sectors in root ;an053;bgb;an000;bgb ;an015;bgb
cmp ax,2 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF B,OR ;this is not! ;an053;bgb;an032;bgb
JB $$LL71
cmp ax,512 ;make sure it is ok ;an053;bgb;an032;bgb
; $IF A ;this is not! ;an053;bgb;an032;bgb
JNA $$IF71
$$LL71:
jmp baddrv ;an053;bgb
; $ENDIF ;an053;bgb
$$IF71:
;an053;bgb
mov cl,Dir_Entries_Per_Sector ; by dividing RootEntries ;an053;bgb;an000;bgb ;AN000;
cmp cl,0 ;an053;bgb;an000;bgb;an022;bgb
; $IF NE ;an053;bgb;an000;bgb;an022;bgb
JE $$IF73
div cl ; by (512/32) ;an053;bgb;an000;bgb;an022;bgb;AN000;
; $ENDIF ;an053;bgb;an000;bgb;an022;bgb
$$IF73:
pop bx ;Get low sectors per FAT b;an053;bgb;an000;bgback ;AN000;
pop dx ;Get high part ;an053;bgb;an000;bgb ;AN000;
add ax,bx ;Add to get FAT+Dir sector;an053;bgb;an000;bgbs ;AN000;
adc dx,0 ;High part ;an053;bgb;an000;bgb ;AN000;
mov fat_dir_secs,ax ;save it ;an053;bgb;an000;bgb ;an006;bgb
inc fat_dir_secs ; 1 for reserved sector ;an053;bgb;an000;bgb ;an006;bgb
pop bx ;restore bpb pointer ;an053;bgb;an000;bgb ;an015;bgb
add ax,[bx].ReservedSectors ;Add in Boot record sectors ;an053;bgb;an000;bgb ;an015;bgb
adc dx,0 ;to get start of data (DX:;an053;bgb;an000;bgbAX) ;AN000;
mov Data_Start_Low,ax ;Save it ;an053;bgb;an000;bgb ;AN000;
mov Data_Start_High,dx ; ;an053;bgb;an000;bgb ;AN000;
ret ; ;an053;bgb;an000;bgb
get_boot_info endp ; ;an053;bgb;an000;bgb
;****************************************************************************** ;an000;bgb
; Calc_Space : Calculate the total space that is ;an000;bgb
; addressible on the the disk by DOS. ;an000;bgb
; ;an000;bgb
; Inputs : none ;an000;bgb
; ;an000;bgb
; Outputs : Fdsksiz - Size in bytes of the disk ;an000;bgb
;****************************************************************************** ;an000;bgb
Procedure Calc_Space ; ;an000;bgb
; get the total number of clusters on the disk ;an000;bgb ;an006;bgb
p97: xor ax,ax ;clear ax ;an000;bgb
mov ah,36h ;Get disk free space ;an000;bgb
mov dl,alldrv ; 1 based drive number ;an000;bgb
push bx ;save bpb pointer ;an000;bgb;an015;bgb
int 21h ;bx = total space avail ;an000;bgb
;multiply by sectors per cluster ;an000;bgb
gtsecs: mov ax,dx ;get total clusters ;an000;bgb
xor cx,cx ;clear cx ;an000;bgb
pop bx ;restore bpb pointer ;an000;bgb;an015;bgb
mov cl,[bx].SectorsPerCluster ;get total sectors ;an000;bgb;an015;bgb
push bx ;save bpb pointer ;an000;bgb;an015;bgb
xor bx,bx ;clear bx ;an000;bgb
call Multiply_32_Bits ;multiply ;an000;bgb
;multiply by bytes per sector ;an000;bgb
mov dx,bx ;save bx ;an000;bgb;an015;bgb
pop bx ;get bpb addr ;an000;bgb;an015;bgb
mov cx,[bx].BytePerSector ;get total bytes ;an000;bgb;an015;bgb
mov bx,dx ;restore bx ;an000;bgb;an015;bgb
call Multiply_32_Bits ; multiply ;an000;bgb
;result is bytes on disk ;an000;bgb
mov tot_bytes_lo,ax ;save high word ;an000;bgb
mov tot_bytes_hi,bx ;save low word ;an000;bgb
ret ; ;an000;bgb
Calc_Space endp ; ;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Check_For_Network ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: See if target drive isn't local, or if it is a shared drive. If ;an000;bgb
; so, exit with error message. The IOCtl call is not checked for ;an000;bgb
; an error because it is called previously in another routine, and ;an000;bgb
; invalid drive is the only error it can generate. That condition ;an000;bgb
; would not get this far ;an000;bgb
; ;an000;bgb
;Called Procedures: Message (macro) ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Drive_Letter_Buffer.Drive_Number ;an000;bgb
; Fatal_Error = NO ;an000;bgb
; ;an000;bgb
;Output: Fatal_Error = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; See if drive is local (INT 21h, AX=4409 IOCtl) ;an000;bgb
; IF not local ;an000;bgb
; Display network message ;an000;bgb
; Fatal_ERROR = YES ;an000;bgb
; ELSE ;an000;bgb
; IF 8000h bit set on return ;an000;bgb
; Display assign message ;an000;bgb
; Fatal_Error = YES ;an000;bgb
; ENDIF ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Check_For_Network ; ;an000;bgb;AN000;
; ;an000;bgb
mov bl,alldrv ;Drive is 1=A, 2=B ;an000;bgb; ;
mov al,09h ;See if drive is local or remote;an000;bgb;AC000;
DOS_CALL IOCtl ;We will not check for error ;an000;bgb;AC000;
test dx,Net_Check ;if (x & 1200H)(redir or shared);an000;bgb; ;
; $IF NZ ;Found a net drive ;an000;bgb;AC000;
JZ $$IF75
Message No_Net_Arg ;Tell 'em ;an000;bgb;AC000;
mov Fatal_Error,Yes ;Indicate bad stuff ;an000;bgb;AN000;
; $ELSE ;Local drive, now check assign ;an000;bgb;AN000;
JMP SHORT $$EN75
$$IF75:
test dx,Assign_Check ;8000h bit is bad news ;an000;bgb; ;
; $IF NZ ;Found it ;an000;bgb;AC000;
JZ $$IF77
Message SubstErr ;Tell error ;an000;bgb;AC000;
mov Fatal_Error,Yes ;Indicate bad stuff ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF77:
; $ENDIF ; ;an000;bgb;AN000;
$$EN75:
ret ; ;an000;bgb;AN000;
;an000;bgb
Check_For_Network endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Check_Translate_Drive ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Do a name translate call on the drive letter to see if it is ;an000;bgb
; assigned by SUBST or ASSIGN ;an000;bgb
; ;an000;bgb
;Called Procedures: Message (macro) ;an000;bgb
; ;an000;bgb
;Change History: Created 5/1/87 MT ;an000;bgb
; ;an000;bgb
;Input: Drive_Letter_Buffer.Drive_Number ;an000;bgb
; Fatal_Error = NO ;an000;bgb
; ;an000;bgb
;Output: Fatal_Error = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; Put drive letter in ASCIIZ string "d:\",0 ;an000;bgb
; Do name translate call (INT 21) ;an000;bgb
; IF drive not same ;an000;bgb
; Display assigned message ;an000;bgb
; Fatal_Error = YES ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
Procedure Check_Translate_Drive ; ;an000;bgb;AN000;
call func60 ; ;an000;bgb
mov bl,byte ptr [TranSrc] ;Get drive letter from path ;an000;bgb; ;
cmp bl,byte ptr [Chkprmt_End] ;Did drive letter change? ;an000;bgb; ;
; $IF NE ;If not the same, it be bad ;an000;bgb;AC000;
JE $$IF80
Message SubstErr ;Tell user ;an000;bgb;AC000;
mov Fatal_Error,Yes ;Setup error flag ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF80:
ret ; ;an000;bgb;AN000;
Check_Translate_Drive endp ; ;an000;bgb;AN000;
;an000;bgb
;an000;bgb
Procedure func60 ; ;an000;bgb;AN000;
; PUSH DS ;ICE ;an000;bgb
; push bx ;ICE ;an000;bgb
; push ax ;ICE ;an000;bgb
; ;an000;bgb
; mov bx,0140H ;ICE ;an000;bgb
; xor ax,ax ;ICE ;an000;bgb
; mov ds,ax ;ICE ;an000;bgb
; mov ax,word ptr ds:[bx] ;ICE ;an000;bgb
; mov word ptr ds:[bx],ax ;ICE ;an000;bgb
; ;an000;bgb
; pop ax ;ICE ;an000;bgb
; pop bx ;ICE ;an000;bgb
; POP DS ;ICE ;an000;bgb
;an000;bgb
mov byte ptr [transrc],'A' ;an000;bgb
mov bl,alldrv ;Get drive ; ;an000;bgb ;
dec bl ;Make it 0 based ;an000;bgb;AN001;
add byte ptr [TranSrc],bl ;Make string "d:\" ;an000;bgb; ;
lea si,TranSrc ;Point to translate string ;an000;bgb; ;
push ds ;Set ES=DS (Data segment) ;an000;bgb; ;
pop es ; " " " " ;an000;bgb; ;
lea di,Chkprmt_End ;Point at output buffer ;an000;bgb; ;
DOS_Call xNameTrans ;Get real path ;an000;bgb;AC000;
ret ; ;an000;bgb;AN000;
func60 endp ; ;AN000; ;an000;bgb
;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Hook_Interrupts ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Change the interrupt handler for INT 13h to point to the ;an000;bgb
; ControlC_Handler routine ;an000;bgb
; ;an000;bgb
;Called Procedures: None ;an000;bgb
; ;an000;bgb
;Change History: Created 4/21/87 MT ;an000;bgb
; ;an000;bgb
;Input: None ;an000;bgb
; ;an000;bgb
;Output: None ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Point at ControlC_Handler routine ;an000;bgb
; Set interrupt handler (INT 21h, AX=2523h) ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
procedure Hook_Interrupts ; ;an000;bgb;AN000;
; ;an000;bgb
mov al,23h ;an000;bgb
DOS_Call Get_Interrupt_Vector ;Get the INT 23h handler ;an000;bgb;AC000;
mov word ptr [CONTCH],bx ; ;an000;bgb
mov bx,es ; ;an000;bgb;AN000;
mov word ptr [CONTCH+2],bx ; ;an000;bgb
mov al,23h ;Specify CNTRL handler ;an000;bgb; ;
lea dx, INT_23 ;Point at it ;an000;bgb; ;
push ds ;Save data seg ;an000;bgb; ;
push cs ;Point to code segment ;an000;bgb; ;
pop ds ; ;an000;bgb; ;
DOS_Call Set_Interrupt_Vector ;Set the INT 23h handler ;an000;bgb;AC000;
pop ds ;Get Data degment back ;an000;bgb; ;
mov al,24h ; ;an000;bgb
DOS_Call Get_Interrupt_Vector ;Get the INT 24h handler ;an000;bgb;AC000;
mov word ptr [HardCh],bx ;Save it ;an000;bgb
mov bx,es ; ;an000;bgb
mov word ptr [HardCh+2],bx ; ;an000;bgb
mov al,24h ;Specify handler ;an000;bgb ; ;
lea dx, INT_24 ;Point at it ;an000;bgb; ;
push ds ;Save data seg ;an000;bgb; ;
push cs ;Point to code segment ;an000;bgb; ;
pop ds ; ;an000;bgb; ;
DOS_Call Set_Interrupt_Vector ;Set the INT 23h handler ;an000;bgb;AC000;
pop ds ;Get Data degment back ;an000;bgb; ;
ret ; ;an000;bgb;AN000;
;an000;bgb
hook_Interrupts endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Clear_Append_X ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: Determine if Append /XA is turned on thru INT 2Fh, and shut ;an000;bgb
; off for life of CHKDSK if it is. ;an000;bgb
; ;an000;bgb
;Called Procedures: None ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Change History: Created 5/13/87 MT ;an000;bgb
; ;an000;bgb
;Input: None ;an000;bgb
; ;an000;bgb
;Output: APPEND = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Append = NO ;an000;bgb
; See if APPEND /X is present (INT 2Fh, AX=0B706h) ;an000;bgb
; IF present ;an000;bgb
; Turn append /X off (INT 2Fh, AX=B707h, BX = 0) ;an000;bgb
; Append = YES ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Clear_Append_X ; ;an000;bgb ;AN000;
;an000;bgb
mov Append,NO ;Init the Append /X flag ;an000;bgb;AN000;
mov ax,Append_X ;Is Append /X there? ;an000;bgb;AN000;
int Multiplex ; " " " " ;an000;bgb;AN000;
cmp bx,Append_X_Set ;Was it turned on? ;an000;bgb;AN000;
; $IF E ;Yep ;an000;bgb;AN000;
JNE $$IF82
mov Append,YES ;Indicate that it was on ;an000;bgb;AN000;
mov ax,Set_Append_X ;Turn Append /X off ;an000;bgb;AN000;
mov bx,Append_Off ; " " " " ;an000;bgb;AN000;
int Multiplex ; " " " " ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF82:
ret ; ;an000;bgb;AN000;
;an000;bgb
Clear_Append_X endp ; ;an000;bgb;AN000;
;an000;bgb
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: CHKDSK_IFS ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: ;an000;bgb
; ;an000;bgb
;Called Procedures: Main_Routine ;an000;bgb
; EXEC_FS_CHKDSK ;an000;bgb
; Done ;an000;bgb
; ;an000;bgb
;Change History: Created 5/8/87 MT ;an000;bgb
; ;an000;bgb
;Input: FS_Not_FAT = Yes/No ;an000;bgb
; ;an000;bgb
;Output: None ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; IF File system other than FAT ;an000;bgb
; Go call file system specific CHKDSK (CALL Exec_FS_CHKDSK) ;an000;bgb
; ELSE ;an000;bgb
; Do FAT based CHKDSK (CALL Main_Routine) ;an000;bgb
; ENDIF ;an000;bgb
; Restore current drive (CALL Done) ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
;an000;bgb
Procedure CHKDSK_IFS ; ;an000;bgb;AN000;
;an000;bgb
ifdef fsexec ;an038;bgb
cmp FS_Not_Fat,YES ;Is the target FS a FAT? ;an038;bgb;AN000;
; $IF E ;No, so need to exec the ;an038;bgb;AN000;
JNE $$IF84
call EXEC_FS_CHKDSK ; file system specific prog. ;an038;bgb;AN000;
; $ELSE ;It's a FAT ;an038;bgb;AN000;
JMP SHORT $$EN84
$$IF84:
endif ;an038;bgb
call Main_Routine ;Use canned code! ;an038;bgb;AN000;
ifdef fsexec ;an038;bgb
; $ENDIF ; ;an038;bgb;AN000;
$$EN84:
endif ;an038;bgb
call Done ;Restore current drive ;an000;bgb;AN000;
ret ; ;an000;bgb;AN000;
;an000;bgb
CHKDSK_IFS endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Reset_Append_X ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;description: If APPEND /XA was on originally, turn it back on ;an000;bgb
; ;an000;bgb
;Called Procedures: None ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Change History: Created 5/13/87 MT ;an000;bgb
; ;an000;bgb
;Input: None ;an000;bgb
; ;an000;bgb
;Output: APPEND = YES/NO ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; IF APPEND = YES ;an000;bgb
; Turn append /X on (INT 2Fh, AX=B707h, BX = 1) ;an000;bgb
; ENDIF ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Procedure Reset_Append_X ; ;an000;bgb;AN000;
;an000;bgb
cmp Append,Yes ;Was Append /X on to start with?;an000;bgb;AN000;
; $IF E ;Yep ;an000;bgb;AN000;
JNE $$IF87
mov ax,Set_Append_X ;Turn Append /X off ;an000;bgb;AN000;
mov bx,Append_On ; " " " " ;an000;bgb;AN000;
int Multiplex ; " " " " ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF87:
ret ; ;an000;bgb;AN000;
;an000;bgb
Reset_Append_X endp ; ;an000;bgb;AN000;
;an000;bgb
;***************************************************************************** ;an000;bgb
;Routine name: Multiply_32_Bits ;an000;bgb
;***************************************************************************** ;an000;bgb
; ;an000;bgb
;Description: A real sleazy 32 bit x 16 bit multiply routine. Works by adding ;an000;bgb
; the 32 bit number to itself for each power of 2 contained in the ;an000;bgb
; 16 bit number. Whenever a bit that is set in the multiplier (CX) ;an000;bgb
; gets shifted to the bit 0 spot, it means that that amount has ;an000;bgb
; been multiplied so far, and it should be added into the total ;an000;bgb
; value. Take the example CX = 12 (1100). Using the associative ;an000;bgb
; rule, this is the same as CX = 8+4 (1000 + 0100). The ;an000;bgb
; multiply is done on this principle - whenever a bit that is set ;an000;bgb
; is shifted down to the bit 0 location, the value in BX:AX is ;an000;bgb
; added to the running total in DI:SI. The multiply is continued ;an000;bgb
; until CX = 0. The routine will exit with CY set if overflow ;an000;bgb
; occurs. ;an000;bgb
; ;an000;bgb
; ;an000;bgb
;Called Procedures: None ;an000;bgb
; ;an000;bgb
;Change History: Created 7/23/87 MT ;an000;bgb
; ;an000;bgb
;Input: BX:AX = 32 bit number to be multiplied ;an000;bgb
; CX = 16 bit number to be multiplied. (Must be even number) ;an000;bgb
; ;an000;bgb
;Output: BX:AX = output. ;an000;bgb
; CY set if overflow ;an000;bgb
; ;an000;bgb
;Psuedocode ;an000;bgb
;---------- ;an000;bgb
; ;an000;bgb
; Point at ControlC_Handler routine ;an000;bgb
; Set interrupt handler (INT 21h, AX=2523h) ;an000;bgb
; ret ;an000;bgb
;***************************************************************************** ;an000;bgb
;an000;bgb
Public Multiply_32_Bits ;an000;bgb
Multiply_32_Bits proc ; ;an000;bgb;AN000;
;an000;bgb
push di ; ;an000;bgb;AN000;
push si ; ;an000;bgb;AN000;
xor di,di ;Init result to zero ;an000;bgb
xor si,si ; ;an000;bgb
cmp cx,0 ;Multiply by 0? ;an000;bgb;AN000;
; $IF NE ;Keep going if not ;an000;bgb;AN000;
JE $$IF89
; $DO ;This works by adding the result;an000;bgb;AN000;
$$DO90:
test cx,1 ;Need to add in sum of this bit?;an000;bgb;AN000;
; $IF NZ ;Yes ;an000;bgb;AN000;
JZ $$IF91
add si,ax ;Add in the total so far for ;an000;bgb;AN000;
adc di,bx ; this bit multiplier (CY oflow);an000;bgb;AN000;
; $ELSE ;Don't split multiplier ;an000;bgb;AN000;
JMP SHORT $$EN91
$$IF91:
clc ;Force non exit ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$EN91:
; $LEAVE C ;Leave on overflow ;an000;bgb;AN000;
JC $$EN90
shr cx,1 ;See if need to multiply value ;an000;bgb;AN000;
cmp cx,0 ;by 2 ;an000;bgb;AN000;
; $LEAVE E ;Done if cx shifted down to zero;an000;bgb;AN000;
JE $$EN90
add ax,ax ;Each time cx is shifted, add ;an000;bgb;AN000;
adc bx,bx ;value to itself (Multiply * 2) ;an000;bgb;AN000;
; $ENDDO C ;CY set on overflow ;an000;bgb;AN000;
JNC $$DO90
$$EN90:
; $IF NC ;If no overflow, add in DI:SI ;an000;bgb;AN000;
JC $$IF97
mov ax,si ; which contains the original ;an000;bgb;AN000;
mov bx,di ; value if odd, 0 if even. This ;an000;bgb;AN000;
clc ;Set no overflow flag ;an000;bgb;AN000;
; $ENDIF ; ;an000;bgb;AN000;
$$IF97:
; $ELSE ; ;an000;bgb
JMP SHORT $$EN89
$$IF89:
xor ax,ax ; ;an000;bgb
xor bx,bx ; ;an000;bgb
; $ENDIF ;Multiply by 0 ;an000;bgb;AN000;
$$EN89:
pop si ; ;an000;bgb;AN000;
pop di ; ;an000;bgb;AN000;
ret ; ;an000;bgb;AN000;
;an000;bgb
Multiply_32_Bits endp ;an000;bgb
pathlabl chkinit ;an000;bgb
code ends ;an000;bgb
end ;an000;bgb
;an000;bgb
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