install.asm
来自「这是一些例程」· 汇编 代码 · 共 267 行
ASM
267 行
.MODEL small, pascal
INCLUDE tsr.inc
;* INSTALLATION SECTION - The following code and data are used only
;* during the TSR's installation phase. When the program terminates
;* through Function 31h, memory occupied by the following code and
;* data segments is returned to the operating system.
DGROUP GROUP INSTALLCODE, INSTALLDATA
INSTALLDATA SEGMENT WORD PUBLIC 'DATA2' ; Data segment for installation phase
PUBLIC _MsgTbl
_MsgTbl WORD Msg0 ; Deinstalled okay
WORD Msg1 ; Installed okay
WORD Msg2 ; Already installed
WORD Msg3 ; Can't install
WORD Msg4 ; Can't find flag
WORD Msg5 ; Can't deinstall
WORD Msg6 ; Requires DOS 2+
WORD Msg7 ; MCB damaged
WORD Msg8 ; Invalid ID
WORD Msg9 ; Invalid memory block address
WORD Msg10 ; Successful access
WORD Msg11 ; Can't access
WORD Msg12 ; Unrecognized option
Msg0 BYTE CR, LF, "TSR deinstalled", CR, LF, 0
Msg1 BYTE CR, LF, "TSR installed", CR, LF, 0
Msg2 BYTE CR, LF, "TSR already installed", CR, LF, 0
Msg3 BYTE CR, LF, "Can't install TSR", CR, LF, 0
Msg4 BYTE CR, LF, "Can't find MS-DOS Critical Error Flag", CR, LF, 0
Msg5 BYTE CR, LF, "Can't deinstall TSR", CR, LF, 0
Msg6 BYTE CR, LF, "Requires MS-DOS 2.0 or later", CR, LF, 0
Msg7 BYTE CR, LF, "Memory Control Block damaged", CR, LF, 0
Msg8 BYTE CR, LF, "No ID numbers available", CR, LF, 0
Msg9 BYTE CR, LF, "Can't free memory block: invalid address", CR, LF,0
Msg10 BYTE CR, LF, "TSR successfully accessed", CR, LF, 0
Msg11 BYTE CR, LF, "Can't access: TSR not installed", CR, LF, 0
Msg12 BYTE CR, LF, "Unrecognized option", CR, LF, 0
INSTALLDATA ENDS
INSTALLCODE SEGMENT PARA PUBLIC 'CODE2'
ASSUME ds:@data
;* GetOptions - Scans command line for argument of form /X or -X
;* where X = specified ASCII character. Presumes that argument is
;* preceded by either '/' or '-'. Comparisons are case insensitive.
;* Designed to be callable only from an assembly-language program.
;*
;* Params: ES = Segment address of Program Segment Prefix
;* AL = Argument character for which to scan
;*
;* Return: AX = One of the following codes:
;* NO_ARGUMENT if empty command line
;* OK_ARGUMENT if argument found
;* BAD_ARGUMENT if argument not as specified
;* ES:DI = Pointer to found argument
GetOptions PROC NEAR
and al, 11011111y ; Make character upper case
mov ah, NO_ARGUMENT ; Assume no argument
mov di, 80h ; Point to command line
sub ch, ch
mov cl, BYTE PTR es:[di] ; Command-line count
jcxz exit ; If none, quit
sub bx, bx ; Initialize flag
; Find start of argument
loop1:
inc di ; Point to next character
mov dl, es:[di] ; Get character from argument list
cmp dl, '/' ; Find option prefix '/'
je analyze
cmp dl, '-' ; or option prefix '-'
je analyze
.IF (dl != ' ') && (dl != TAB ) ; If not white space,
inc bx ; Set flag if command line not empty
.ENDIF
loop loop1
or bx, bx ; Empty command line?
jz exit ; Yes? Normal exit
jmp SHORT e_exit ; Error if no argument is preceded
; by '-' or '/' prefixes
; '/' or '-' prefix found. Compare command-line character
; with character specified in AL.
analyze:
mov ah, OK_ARGUMENT ; Assume argument is okay
inc di
mov dl, es:[di]
and dl, 11011111y ; Convert to upper-case
cmp dl, al ; Argument as specified?
je exit ; If so, normal exit
mov ah, BAD_ARGUMENT ; Else signal bad argument,
inc bx ; raise flag, and
jmp loop1 ; continue scan
e_exit:
mov ah, BAD_ARGUMENT
exit:
mov al, ah
cbw ; AX = return code
ret
GetOptions ENDP
;* FatalError - Displays an error message and exits to DOS.
;* Callable from a high-level language.
;*
;* Params: Err = Error number
;*
;* Return: AL = Error number returned to DOS (except DOS 1.x)
FatalError PROC FAR,
Err:WORD
mov ax, Err
push ax
mov bx, @data
mov ds, bx ; DS points to DGROUP
mov bx, OFFSET _MsgTbl
shl ax, 1 ; Double to get offset into _MsgTbl
add bx, ax ; BX = table index
mov si, [bx] ; DS:SI points to message
sub bx, bx ; BH = page 0
.WHILE 1
lodsb ; Get character from ASCIIZ string
.BREAK .IF al == 0 ; Break if null terminator
mov ah, 0Eh ; Request video Function 0Eh
int 10h ; Display text, advance cursor
.ENDW
pop ax ; Recover original error code
.IF ax == WRONG_DOS ; If DOS error,
int 20h ; terminate Program (Version 1.x)
.ELSE ; Else,
mov ah, 4Ch ; request DOS Function 4Ch
int 21h ; terminate Program (2.x and later)
.ENDIF
FatalError ENDP
;* GetResidentSize - Returns the number of paragraphs between Program
;* Segment Prefix (PSP) and beginning of INSTALLDATA. This is the size of
;* the program less the now-unneeded installation code and data -- in other
;* words, the size of the resident TSR block. The return value can serve as
;* the argument for the routine KeepTsr.
;*
;* Params: PspSeg - PSP segment address
;*
;* Return: AX = Number of paragraphs
GetResidentSize PROC FAR,
PspSeg:WORD
mov ax, INSTALLDATA ; Bottom of installation section
inc ax ; plus one paragraph
sub ax, PspSeg ; AX = number of paragraphs in
ret ; block to be made resident
GetResidentSize ENDP
;* KeepTsr - Calls Terminate-and-Stay-Resident function to
;* make TSR resident. Callable from a high-level language.
;*
;* Params: ParaNum - Number of paragraphs in resident block
;*
;* Return: DOS return code = 0
KeepTsr PROC FAR,
ParaNum:WORD
mov ax, @data
mov ds, ax ; DS:SI points to "Program
mov si, OFFSET Msg1 ; installed" message
sub bx, bx ; BH = page 0
.WHILE 1
lodsb ; Get character from ASCIIZ string
.BREAK .IF al == 0 ; Break if null terminator
mov ah, 0Eh ; Request video Function 0Eh
int 10h ; Display text, advance cursor
.ENDW
mov dx, ParaNum ; DX = number of paragraphs
mov ax, 3100h ; Request Function 31h, err code = 0
int 21h ; Terminate-and-Stay-Resident
ret
KeepTsr ENDP
;* FreeTsr - Deinstalls TSR by freeing its two memory blocks: program
;* block (located at PSP) and environment block (located from address
;* at offset 2Ch of PSP). Callable from a high-level language.
;*
;* Params: PspSeg - Segment address of TSR's Program Segment Prefix
;*
;* Return: AX = 0 if successful, or one of the following error codes:
;* MCB_DESTROYED if Memory Control Block damaged
;* INVALID_ADDR if invalid block address
FreeTsr PROC FAR,
PspSeg:WORD
mov es, PspSeg ; ES = address of resident PSP
mov ah, 49h ; Request DOS Function 49h
int 21h ; Release memory in program block
.IF !carry? ; If no error:
mov es, es:[2Ch] ; ES = address of environment block
mov ah, 49h ; Request DOS Function 49h
int 21h ; Release Memory in environment block
.IF !carry? ; If no error:
sub ax, ax ; Return AX = 0
.ENDIF ; Else exit with AX = error code
.ENDIF
ret
FreeTsr ENDP
;* CallMultiplexC - Interface for CallMultiplex procedure to make it
;* callable from a high-level language. Separating this ability from
;* the original CallMultiplex procedure keeps assembly-language calls
;* to CallMultiplex neater and more concise.
;*
;* Params: FuncNum - Function number for multiplex handler
;* RecvPtr - Far address to recieve ES:DI pointer
;*
;* Return: One of the following return codes:
;* NOT_INSTALLED IS_INSTALLED NO_IDNUM
;* ES:DI pointer written to address in RecvPtr
CallMultiplexC PROC FAR USES ds si di,
FuncNum:WORD, RecvPtr:FPVOID
mov al, BYTE PTR FuncNum ; AL = function number
call CallMultiplex ; Multiplex
lds si, RecvPtr ; DS:SI = far address of pointer
mov [si], di ; Return ES:DI pointer for the
mov [si+2], es ; benefit of high-level callers
ret
CallMultiplexC ENDP
INSTALLCODE ENDS
END
⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?