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Assembly Source File | 1994-03-26 | 12.2 KB | 585 lines

;======================================================================== ; Copyright (C) 1991-94 by Jan.Engvald@ldc.lu.se, see file COPYING. ;************************************************************************ ;* SearchAndSub ;* ;* Find lowest index table entry with value (in seconds) <= DX,AX ;* and subtract off table value from DX,AX. ;************************************************************************ assume ds:code_s SearchAndSub proc near call BinSearch call AfterSearch ret SearchAndSub endp BinSearch proc near push bx mov bx,cx ; compute power of 2 mov cx,4 ; table size BinLenLoop: shl cx,1 cmp cx,bx jb BinLenLoop mov bx,cx ; start binary search BinLess: sub bx,cx BinGreater: shr cx,1 cmp cx,4 jb BinDone ; no match return add bx,cx cmp dx,2[si+bx] BinEval: ja BinGreater jb BinLess cmp ax,[si+bx] ja BinGreater jb BinLess BinDone: mov cx,bx ; save table index lea si,[si+bx] ; and table entry address pop bx ret BinSearch endp AfterSearch proc near sub ax,[si] ; subtract seconds sbb dx,2[si] ; by table value shr cx,1 ; calculate table index shr cx,1 ret AfterSearch endp ;************************************************************************ ;* DateTimeCalc ;************************************************************************ DateTimeCalc proc near mov ax,bx mov dx,cx push si push ax ; save seconds since push dx ; year 1900 mov si,offset Ytab mov cx,4*64 call SearchAndSub ; find and subtract years add cx,1964 mov cYear,cx ; set year push ax ; reminder still too big push dx ; for 16 bits, shr dx,1 ; have to rcr ax,1 ; divide by 2 div m12hour inc ax mov cDayOfYear,ax ; set day within year pop dx ; restore seconds within year pop ax and cl,011b ; extract leap year index mov cNonLeapYear,cl mov si,offset Motab jnz NoLeapYear mov si,offset Mltab NoLeapYear: mov cx,4*16 call SearchAndSub ; find and subtract month inc cx mov cMonth,cx ; set month within year shr dx,1 ; reminder still too big rcr ax,1 ; for 16 bits, have to rcr bx,1 ; divide by 2 div m12hour ; divide by 24hr/2 inc ax mov cDay,ax ; set day within month mov ax,dx xor dx,dx shl bx,1 ; recover lost bit rcl ax,1 ; into reminder rcl dx,1 div mhour ; divide by 3600 mov cHour,ax ; set hour within day mov ax,dx div m60b ; divide by 60 mov dl,ah xor dh,dh mov cSecond,dx ; set second within minute xor ah,ah mov cMinute,ax ; set minute within hour pop dx ; restore seconds since pop ax ; year 1900 shr dx,1 ; too big for 16 bits... rcr ax,1 div m12hour ; calculate days since 1900 inc ax xor dx,dx ; calculate weeks since 1900 div m7 mov cWday,dx ; set weekday pop si ret DateTimeCalc endp ;************************************************************************ ;* SetTime ;************************************************************************ SetTime proc near push cs push cs pop ds pop es cld ; convert from network byte mov cx,cTime ; order xchg ch,cl mov bx,cTime+2 xchg bh,bl mov dx,tzoffset+2 ; and apply time zone xchg dh,dl sub bx,dx mov ax,tzoffset ; offset xchg ah,al sbb cx,ax mov ax,AlterTime ; add alter-days imul m6hour shl ax,1 rcl dx,1 shl ax,1 rcl dx,1 add bx,ax adc cx,dx mov ax,AlterTime+2 ; add alter-time mov dx,AlterTime+4 add bx,ax adc cx,dx mov si,AlgPtr or si,si ; any daylight algorithm? jnz DoDls jmp SetNoDls DoDls: push bx push cx add si,4 lodsw ; from switching time imul m1 sub bx,ax sbb cx,dx call DateTimeCalc ; dst start evaluation mov ax,AlgEntryLen cmp si,offset AlgTab.AEE6 ; Europe 1996 algorithm switch? ja SetNotEuSw cmp cYear,1996 jb SetNotEuSw add si,ax SetNotEuSw: cmp si,offset AlgTab.Apa0 ; four entry part? jl SingleEntry mul cNonLeapYear add si,ax cmp si,offset AlgTab.Ais0 ; acyclic entry? jb SingleEntry cmp cYear,WARNYEAR jb SingleEntry mov MsgTermStop,' ' ; activate warning msg SingleEntry: mov bp,cDayOfYear lodsw ; from switching weekday cmp al,SAT ja FromDate dec bp cmp ax,cWday jg CurWeekF add bp,7 CurWeekF: sub bp,cWday add bp,ax FromDate: pop cx pop bx push bx push cx lodsw ; from switching week push ax lodsw ; until switching time imul m1 sub bx,ax sbb cx,dx call DateTimeCalc ; dst end evaluation mov di,cDayOfYear pop dx lodsw ; until switching weekday cmp al,SAT ja UntilDate dec di cmp ax,cWday jg CurWeekU add di,7 CurWeekU: sub di,cWday add di,ax UntilDate: lodsw ; until switching week test cNonLeapYear,011b jnz SetNotLeap cmp ax,31+28 jbe SetChkLU inc ax SetChkLU: cmp dx,31+28 jbe SetNotLeap inc dx SetNotLeap: pop cx pop bx cmp ax,dx ; north or south of equator? jl SetSouth cmp dx,bp ; to do or not to do dls? jg SetNoDls jmp short SetChkUntil SetSouth: cmp dx,bp ; to do or not to do dls? jle DoDLSaving SetChkUntil: cmp di,ax jge SetNoDls DoDLSaving: or GenFlags,DSTNOW lodsw ; dst advance time mov DstAdvance,ax imul m1 add bx,ax adc cx,dx SetNoDls: call DateTimeCalc ; calculate date and time test Flagword,DONT_SETTIME ; did we use alter argument? jz SetPCtime mov di,offset msgset mov cx,12 mov al,' ' rep stosb ; clear "Clock set to" jmp short SkipTimeset SetPCtime: mov cx,cYear mov dh,byte ptr cMonth mov dl,byte ptr Cday mov ah,2Bh ; set date int 21h or al,al jz DateOK mov al,5 ; error code 5 call Terminate DateOK: mov ch,byte ptr cHour mov cl,byte ptr cMinute mov dh,byte ptr cSecond mov dl,99 mov ah,2Dh ; set time int 21h or al,al jz TimeOK mov al,6 ; error code 6 call Terminate TimeOK: SkipTimeset: ; edit time display msg mov al,byte ptr cWday mul m6 add ax,offset Weekdays mov si,ax mov di,offset msgweek mov cx,3 rep movsw ; copy weekday string mov si,offset cYear mov di,offset msgyear mov ch,'-' mov cl,3 call PutNums ; put date mov di,offset msghour mov ch,':' mov cl,3 call PutNums ; put time mov si,offset RespondingIpNr mov di,offset msgts call PutIpNum ; put time server IP # mov dx,offset msgset mov ah,9 int 21h ; display string ret SetTime endp ;********************************************************************** ; ; Timezone environment handling ; ;********************************************************************** assume ds:code_s comment | ========== tech.notes/pc.code #29, from pmaupin, 3407 chars, Sat Jun 4 22:40:45 1988 ---------- TITLE: Finding DOS's master environment pointer This is a fragment of code that my SD.COM program uses to find the environment. This fragment is different than most ways of finding the environment, in that it finds the MASTER environment block, not the current process's parent's environment. This is useful in some cases, and has the added advantage that it does NOT behave differently when executing under CodeView, so you do NOT have to hard-code your system's DOS environment address into your program in order to debug it. | EnvPtr EQU 2CH ; Offset in PSP CommandInterrupt EQU 2EH ; entry point into first Command.Com ; through interpreter DosSegPtr EQU CommandInterrupt * 4 + 2 ; FindEnvironment is passed: ; DS should point to program PSP ; FindEnvironment returns: ; ES points to master environment block, or program's copy if couldn't ; find the master. ; CX is length of block, or 0 if couldn't find the master. ; FindEnvironment destroys: ; AX, SI FindEnvironment PROC NEAR xor si,si ; Point to segment 0 mov es,si mov si, word ptr es:[DosSegPtr] mov ax,si call VerifyBlock ; make sure we've found COMMAND jnz GotBlock ; jump if not a good block -- ; use process's environment mov ax,es:[EnvPtr+10h] ; get COMMAND's environment ptr or ax,ax ; jump if COMMAND has a jnz MaybeGoodBlock ; subsidiary environment mov ax,si ; If no subsidiary, just use add ax,cx ; the allocation block inc ax ; immediately after COMMAND MaybeGoodBlock: call VerifyBlock ; verify that we have a good ; one, one way or another GotBlock: shl cx,1 ; multiply by 16 to get shl cx,1 ; length in bytes shl cx,1 shl cx,1 mov es,ax ret ; VerifyBlock tries to insure that we're pointing to a valid DOS ; allocation block. If not, returns the current process's environment ; block. VerifyBlock PROC NEAR dec ax ; get block header into ES mov es,ax inc ax cmp byte ptr es:[0],04Dh ; make sure signature is valid jnz UseCurrent cmp word ptr es:[1],si ; make sure owner is valid jnz UseCurrent mov cx, word ptr es:[3] ; retrieve the length ret UseCurrent: mov ax,word ptr ds:[EnvPtr] ; get current process's env xor cx,cx ; zero length ret VerifyBlock ENDP FindEnvironment ENDP comment | So far, this seems to work. I would welcome any feedback on its efficacy, but if the feedback is negative, please give the DOS version and a detailed problem description. Thanks, Pat | ;************************************************************************ ;* SetZone ;* ;************************************************************************ assume ds:code_s SetZone proc near test GenFlags,ARGZONE ; anything to SET? jnz SetZoneInfo ret SetZoneInfo: cld test GenFlags,ARGZONESPEC ; extended syntax? jnz SetZoneSpecial mov ax,DstAdvance ; -no, use numeric zones xor dx,dx ; compute current time offset mov cx,tzoffset xchg ch,cl mov bx,tzoffset+2 xchg bh,bl sub ax,bx sbb dx,cx mov cl,'+' jns ZonePositive ; current time offset sign? mov cl,'-' call NegDxAx ZonePositive: mov di, offset ZoneString add di,ZoneVarLen mov [di],cl div mhour ; compute hours push ax mov ax,dx div m60b ; and minutes xor ah,ah mov di,offset ZoneString+3 add di,ZoneVarLen mov PutMinDigits,2 ; *test call PutNum ; put minutes pop ax sub di,4 call PutNum ; put hours jmp short EnvMaster SetZoneSpecial: test GenFlags,DSTNOW ; is it normal or dls time? jz EnvMaster mov di,offset ZoneString ; -dls, copy dls name mov si,di ; on top of normal name add di,ZoneVarLen add si,ZoneDstInd SetZoneLoop: lodsb stosb cmp al,0 jne SetZoneLoop stosb mov al,'$' stosb sub di,offset ZoneString+1 mov ZoneStrLen,di EnvMaster: call FindEnvironment ; Find master environment xor di,di xor al,al EnvNext: jcxz EnvNotFound test FlagWord,DONT_SETTIME jnz EnvZonePr push cx ; look for TZ= push di mov cx,ZoneVarLen mov si,offset ZoneString repe cmpsb jnz EnvNoMatch pop di ; if found, remove whole string pop cx push cx push di repne scasb mov si,di pop di push di push es pop ds rep movsb push cs pop ds EnvNoMatch: pop di pop cx cmp byte ptr es:[di],0 ; end of strings? je EnvEnd repne scasb ; -no, skip past this string jmp short EnvNext EnvEnd: cmp cx,ZoneStrLen ; add TZ string to the end jb EnvNotFound mov cx,ZoneStrLen mov si,offset ZoneString rep movsb EnvZonePr: mov dx,offset ZoneMsg push cs pop ds mov ah,9 int 21h ; display env var contents EnvNotFound: push cs ; restore ds and es push cs pop ds pop es ret SetZone endp