Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP Posting-Version: version B 2.10.1 6/24/83; site ut-ngp.UUCP Path: utzoo!linus!philabs!cmcl2!seismo!ut-sally!ut-ngp!knutson From: knutson@ut-ngp.UUCP (Jim Knutson) Newsgroups: net.sources Subject: MS-DOS Kermit sources (Part 1 of 7) Message-ID: <1004@ut-ngp.UUCP> Date: Fri, 5-Oct-84 12:02:50 EDT Article-I.D.: ut-ngp.1004 Posted: Fri Oct 5 12:02:50 1984 Date-Received: Sun, 7-Oct-84 03:49:09 EDT Organization: U.Texas Computation Center, Austin, Texas Lines: 3101 This and the 6 following messages contain the source code and documentation for Kermit-MS and code for downloading the program to your micro. The source will build Kermit for the IBM-PC and any compatibles running DOS 1.x or 2.x, the NEC APC, DEC Rainbow, HP-150, Zenith Z100, and Wang. ------------------- Cut here ----------------- : Run this shell script with "sh" not "csh" PATH=:/bin:/usr/bin:/usr/ucb export PATH all=FALSE if [ $1x = -ax ]; then all=TRUE fi /bin/echo 'Extracting mscmd.asm' sed 's/^X//' <<'//go.sysin dd *' >mscmd.asm public comnd, cmcfrm, prserr, repars, cmgtch, drives, comand, fcbcpy include msdefs.h datas segment public 'datas' extrn flags:byte, trans:byte, fcb:byte, buff:byte extrn taklev:byte, takadr:word, dosnum:byte comand cmdinfo <> cmer00 db cr,lf,'?Program error Invalid COMND call$' cmer01 db cr,lf,'?Ambiguous$' cmer02 db cr,lf,'?Illegal input file spec$' cmer03 db cr,lf,'?Invalid command$' ; [19e] cmer04 db cr,lf,'?Invalid command or operand$' ; [1] cmer06 db cr,lf,'?Wildcard not allowed$' ; [21a] cmer07 db cr,lf,'?Invalid drive specificaton$' ; [21a] cmin00 db ' Confirm with carriage return$' cmin01 db ' One of the following:',cr,lf,'$' cmthlp dw 0 ; Text of help message for random input. drives db 0 ; How many drives we have. [21a] crlf db cr,lf,'$' ctcmsg db '^C$' prsp db ' $' ; Print a space. hlpmsg dw 0 ; Address of help message. spchar db 24H,26H,23H,40H,21H,25H,27H,28H,29H,2DH db 3CH,3EH,7BH,7DH,5FH,5CH,5EH,7EH,7CH,60H spclen equ $-spchar spchar2 db 24H,26H,23H,40H,21H,25H,27H,28H,29H,2DH db 7BH,7DH,5FH,5EH,7EH,60H spc2len equ $-spchar2 escspc db 10O,' ',10O,'$' ; Clear escape. clrspc db ' ',10O,'$' ; Clear space. filbuf db 60H DUP(?) ; Character buffer. tbuff db 80 DUP(?) cmdstk dw ? datas ends code segment public extrn dodel:near, ctlu:near, cmblnk:near, locate:near, takrd:near extrn clearl:near assume cs:code,ds:datas,es:datas ; This routine parses the specified function in AH. Any additional ; information is in DX and BX. ; Returns +1 on success ; +4 on failure (assumes a JMP follows the call) CMND PROC NEAR comnd: mov comand.cmstat,ah ; Save what we are presently parsing. mov cmdstk,sp ; save stack ptr locally. call cminbf ; Get chars until an action or a erase char. mov ah,comand.cmstat ; Restore 'ah' for upcoming checks. cmp ah,cmcfm ; Parse a confirm? jz cmcfrm ; Go get one. cmp ah,cmkey ; Parse a keyword? jnz cm1 jmp cmkeyw ; Try and get one. cm1: cmp ah,cmifi ; Parse an input file spec? jnz cm2 jmp cmifil ; Go get one. cm2: cmp ah,cmofi ; Output file spec? jnz cm3 jmp cmofil ; Go get one. cm3: cmp ah,cmtxt ; Parse arbitrary text. [8] jnz cm4 jmp cmtext cm4: mov ah,prstr ; Else give error. mov dx,offset cmer00 ; "?Unrecognized COMND call" int dos ret ; This routine gets a confirm. cmcfrm: call cmgtch ; Get a char. cmp ah,0 ; Is it negative (a terminator; a space or ; a tab will not be returned here as they ; will be seen as leading white space.) js cmcfr0 ret ; If not, return failure. cmcfr0: and ah,7FH ; Turn off the minus bit. cmp ah,esc ; Is it an escape? jne cmcfr2 mov ah,conout mov dl,bell ; Get a bell. int dos mov ah,0 mov comand.cmaflg,ah ; Turn off the action flag. mov bx,comand.cmcptr ; Move the pointer to before thee scape. dec bx mov comand.cmcptr,bx mov comand.cmdptr,bx dec comand.cmccnt ; Decremrnt the char count. jmp cmcfrm ; Try again. cmcfr2: cmp ah,'?' ; Curious? jne cmcfr3 mov ah,prstr ; Print something useful. mov dx,offset cmin00 int dos mov ah,prstr mov dx,offset crlf ; Print a crlf. int dos mov ah,prstr mov dx,comand.cmprmp ; Reprint the prompt. int dos mov bx,comand.cmdptr ; Get the pointer into the buffer. mov ah,'$' ; Put a $ there for printing. mov [bx],ah mov bx,comand.cmcptr dec bx ; Decrement & save the buffer pointer. mov comand.cmcptr,bx mov ah,prstr mov dx,offset comand.cmdbuf int dos mov ah,0 ; Turn off the action flag. mov comand.cmaflg,ah jmp repars ; Reparse everything. cmcfr3: cmp ah,ff ; Is it a form feed? jne cmcfr4 call cmblnk ; If so blank the screen. cmcfr4: jmp rskp ; This routine parses a keyword from the table pointed ; to in DX. The format of the table is as follows: ; ; addr: db n ; Where n is the # of entries in the table. ; db m ; M is the size of the keyword. ; db 'string$' ; Where string is the keyword. ; dw ab ; Where ab is data to be returned. ; ; The keywords must be in alphabetical order. cmkeyw: mov comand.cmhlp,bx ; Save the help. mov comand.cmptab,dx ; Save the beginning of keyword table. mov bx,dx mov ch,[bx] ; Get number of entries in table. inc bx mov dx,comand.cmdptr ; Save command pointer. mov comand.cmsptr,dx ; Save pointer's here. cmky1: cmp ch,0 ; Any commands left to check? jne cmky2 jmp cmky41 ; no, go complain cmky2: dec ch mov cl,0 ; Keep track of how many chars read in so far. call cmgtch ; Get a char. cmp ah,0 ; Do we have a terminator? jns cmky2x jmp cmky4 ; Negative number means we do. cmky2x: inc bx ; Point to first letter of keyword. inc cl ; Read in another char. mov al,[bx] cmp ah,'a' ; Less than a? jl cmky21 ; If so, don't capitalize. cmp ah,'z'+1 ; More than z? jns cmky21 and ah,137O ; Capitalize the letter. cmky21: cmp ah,al je cmky3 jg cmky2y jmp cmky41 ; Fail if ah preceeds al alphabetically. cmky2y: jmp cmky6 ; Not this keyword - try the next. cmky3: inc bx ; We match here, how 'bout next char? mov al,[bx] cmp al,'$' ; End of keyword? jne cmky3x jmp cmky7 ; Succeed. cmky3x: mov dl,al ; Save al's char here. call cmgtch inc cl ; Read in another char. mov al,dl cmp ah,'a' jl cmky31 cmp ah,'z'+1 jns cmky31 and ah,137O cmky31: cmp ah,esc+80H ; Escape Recognition (escape w/minus bit on)? je cmky3y cmp ah,'?'+80H ; A question mark? [3] je cmky3y cmp ah,' '+80H ; A space? je cmky3y cmp ah,cr+80H ; Carriage return? je cmky3y jmp cmky38 cmky3y: mov comand.cmkptr,bx ; Save bx here. mov comand.cmsiz,cx ; Save size info. mov comand.cmchr,ah ; Save char for latter. call cmambg ; See if input is ambiguous or not. jmp cmky32 ; Succeeded (not ambiguous). mov ah,comand.cmchr cmp ah,esc+80H ; Escape? je cmky3z cmp ah,'?'+80H ; maybe question mark? je cmkyj1 ; yes, go handle jmp cmky41 ; Else fail. cmky3z: mov ah,conout ; Ring a bell. mov dl,bell int dos mov bx,comand.cmcptr ; Move pointer to before the escape. dec bx mov comand.cmcptr,bx mov comand.cmdptr,bx dec comand.cmccnt ; Decrement char count. mov bx,comand.cmkptr ; Failed - pretend user never typed .... mov cx,comand.cmsiz ; ... in a char. dec cl ; Don't count the escape. dec bx mov comand.cmaflg,0 ; Reset the action flag. jmp cmky3 ; Keep checking. ; ambiguous. Print out all the keywords that match cmkyj1: mov dx,offset cmin01 mov ah,prstr int dos mov bx,comand.cmkptr ; this is current keyword mov cx,comand.cmsiz ; we are cl chars into it mov ch,0 sub bx,cx ; back up to beginning inc bx ; not counting ? mov comand.cmkptr,bx ; save beginning of kw cmkyj2: mov dl,tab ; put a tab before each keyword mov ah,conout int dos mov dx,comand.cmkptr ; get current keyword mov ah,prstr int dos ; print it mov bx,comand.cmkptr ; get keyword back dec bx mov al,[bx] ; get length mov ah,0 add ax,5 ; skip length, $, value, next length add bx,ax ; this is next keyword mov si,bx mov di,comand.cmkptr ; compare with last keyword mov comand.cmkptr,bx ; update this mov cx,comand.cmsiz dec ch ; are we at end of table? jl cmkyj3 ; yes, don't go on mov comand.cmsiz,cx ; else update count mov ch,0 dec cl ; this includes ? jcxz cmkyj2 ; empty, just print it repe cmpsb ; compare to previous string je cmkyj2 ; same, go print this one cmkyj3: jmp cmky50 ; else go finish up cmky32: mov cx,comand.cmsiz ; Restore info. mov bx,comand.cmkptr ; Our place in the keyword table. cmp comand.cmchr,0A0H ; Space? je cmky35 cmp comand.cmchr,0BFH ; Question mark? [3] je cmky35 cmp comand.cmchr,8DH ; Carriage return? je cmky35 dec comand.cmcptr ; Pointer into buffer of input. mov dx,comand.cmcptr cmky33: mov ah,[bx] ; Get next char in keyword. cmp ah,'$' ; Are we done yet? jz cmky34 mov di,dx mov [di],ah inc bx inc dx inc comand.cmccnt jmp cmky33 cmky34: mov ah,' ' mov di,dx mov [di],ah ; Put a blank in the buffer. inc dx mov cx,comand.cmcptr ; Remember where we were. mov comand.cmcptr,dx ; Update our pointers. mov comand.cmdptr,dx mov ah,'$' mov di,dx mov [di],ah ; Add '$' for printing. mov ah,prstr mov dx,cx ; Point to beginning of filled in data. int dos inc bx ; Point to address we'll need. mov bx,[bx] mov comand.cmaflg,0 ; Turn off action flag. jmp rskp cmky35: inc bx mov ah,[bx] ; Find end of keyword. cmp ah,'$' jne cmky35 inc bx mov bx,[bx] ; Address of next routine to call. ; mov comand.cmaflg,0 ; Zero the action flag. jmp rskp cmky38: cmp ah,al je cmky39 jmp cmky6 ; Go to end of keyword and try next. cmky39: jmp cmky3 ; Check next letter. cmky4: and ah,7FH ; Turn off minus bit. cmp ah,'?' ; Need help? je cmky5 cmp ah,' ' ; Just a space - no error. je cmky51 cmp ah,cr je cmky51 cmp ah,tab je cmky51 cmp ah,esc ; Ignore escape? je cmky43 cmky41: mov ah,prstr mov dx,offset cmer03 int dos jmp prserr ; Parse error - give up. cmky43: mov ah,conout ; Ring a bell. mov dl,bell int dos dec comand.cmcptr ;[ESC] don't trash BX here. dec comand.cmdptr ;[ESC] ditto dec comand.cmccnt ; Don't count the escape. mov comand.cmaflg,0 ; Reset action flag. inc ch ; Account for a previous 'dec'. jmp cmky1 ; Start over. cmky5: inc bx ; point to actual keyword mov comand.cmkptr,bx ; remember current kw mov cl,1 ; code above expects to count ? mov comand.cmsiz,cx ; and size mov dx,comand.cmhlp or dx,dx ; was any help given? jnz cmky5a ; yes, use it jmp cmkyj1 ; else make our own message cmky5a: mov ah,prstr int dos cmky50: mov ah,prstr mov dx,offset crlf int dos mov dx,comand.cmprmp ; Address of prompt. int dos mov bx,comand.cmdptr ; Get pointer into buffer. mov al,'$' mov [bx],al ; Add dollar sign for printing. mov dx,offset comand.cmdbuf int dos dec comand.cmcptr ; Don't keep it in the buffer. dec comand.cmccnt ; Don't conut it. mov comand.cmaflg,0 ; Turn off the action flag. jmp repars cmky51: cmp comand.cmcr,1 ; Are bare CR's allowed? je cmky52 ; Yes. mov ah,prstr mov dx,offset cmer04 ; Complain. int dos cmky52: jmp prserr cmky6: inc bx ; Find end of keyword. mov al,[bx] cmp al,'$' jne cmky6 inc bx ; Beginning of next command. inc bx inc bx mov dx,comand.cmsptr ; Get old cmdptr. mov comand.cmdptr,dx ; Restore. mov comand.cmsflg,0FFH jmp cmky1 ; Keep trying. cmky7: call cmgtch ; Get char. cmp ah,0 js cmky71 ; Ok if a terminator. dec bx jmp cmky6 ; No match - try next keyword. cmky71: inc bx ; Get necessary data. mov bx,[bx] cmp ah,9BH ; An escape? jne cmky72 mov ah,prstr mov dx,offset prsp ; Print a space. int dos mov di,comand.cmcptr dec di mov ah,20H mov [di],ah ; Replace escape char with space. mov comand.cmaflg,0 mov comand.cmsflg,0FFH ; Pretend they typed a space. cmky72: jmp rskp ; See if keyword is unambiguous or not from what the user has typed in. cmambg: cmp ch,0 ; Any keywords left to check? jne cmamb0 ret ; If not then not ambiguous. cmamb0: inc bx ; Go to end of keyword ... mov al,[bx] ; So we can check the next one. cmp al,'$' jne cmamb0 add bx,4 ; Point to start of next keyword. dec cl ; Don't count escape. mov dx,comand.cmsptr ; Buffer with input typed by user. cmamb1: mov ah,[bx] ; Keyword char. mov di,dx mov al,[di] ; Input char. cmp al,'a' ; Do capitalizing. jl cmam11 cmp al,'z'+1 jns cmam11 and al,137O cmam11: cmp ah,al ; Keyword bigger than input (alphabetically)? jle cmamb2 ; No - keep checking. ret ; Yes - not ambiguous. cmamb2: inc bx ; Advance one char. inc dx dec cl jnz cmamb1 jmp rskp ; Fail - it's ambiguous. cmifil: mov hlpmsg,bx ; Address of help message. mov bx,dx ; Get the fcb address in bx. mov comand.cmfcb,bx ; Save it. mov ch,0 ; Initialize char count. mov ah,0 mov [bx],ah ; Set the drive to default to current. inc bx mov comand.cmfcb2,bx mov cl,' ' cmifi0: mov [bx],cl ; Blank the FCB. inc bx inc ah cmp ah,0BH ; Twelve? jl cmifi0 cmifi1: call cmgtch ; Get another char. cmp ah,0 ; Is it an action character. js cmif1x ; Jump out of range. [21a] jmp cmifi2 ; Ditto. [21a] cmif1x: and ah,7FH ; Turn off the action bit. [21a] cmp ah,'?' ; A question mark? jne cmif12 mov al,0 mov comand.cmaflg,al ; Blank the action flag. dec comand.cmcptr ; Decrement the buffer pointer. dec comand.cmccnt ; Decrement count. mov ah,prstr mov dx,hlpmsg ; Help message. int dos mov dx,offset crlf int dos mov dx,comand.cmprmp int dos mov bx,comand.cmdptr mov al,'$' mov [bx],al ; Put in dollar sign for printing. mov dx,offset comand.cmdbuf int dos jmp repars cmif12: cmp ah,esc ; An escape? je cm12x jmp cmif13 cm12x: mov comand.cmaflg,0 ; Turn off the action flag. dec comand.cmcptr ; Move pointers to before the escape. dec comand.cmdptr dec comand.cmccnt ; Decrement char count. mov comand.cmchr,ch ; Save current character count. cmp ch,9 ; Past '.'? jl cmf120 ; No. dec ch ; Yes, don't count point. cmf120: mov di,comand.cmfcb2 ; Fill the rest with CP/M wildcards. mov ah,'?' cmf121: cmp ch,11 ; Done? jge cmf122 ; Yes. mov [di],ah inc di inc ch jmp cmf121 cmf122: mov ah,sfirst ; Find first matching file? mov dx,comand.cmfcb ;[jd] use pointer to PASSED fcb int dos cmp al,0FFH ; Any found? jne cmf123 ; Yes. jmp cmf12b ; No, lose. cmf123: mov di,offset filbuf ; Copy first file spec from DTA to buffer. mov bx,offset buff+1 mov cl,11 call fcbcpy mov di,offset filbuf+10H ; Get another copy (if not ambiguous). mov bx,offset buff+1 mov cl,11 call fcbcpy mov ah,snext ; More matching specs? mov dx,comand.cmfcb ;[jd] use PASSED fcb... int dos cmp al,0FFH je cmf124 ; Only one. mov di,offset filbuf+10H ; Copy second file spec. mov bx,offset buff+1 mov cl,11 call fcbcpy cmf124: mov si,offset filbuf ; Start comparing file names. mov bx,offset filbuf+10H mov di,comand.cmcptr ; Command buffer pointer mov cl,comand.cmchr ; Bypass characters typed. cmp cl,9 ; Past '.'? jl cmf125 ; No. dec cl ; Yes, don't count point. cmf125: mov ch,0 ; Adjust pointers. add si,cx add bx,cx mov ch,cl ; Update character count cmf126: cmp ch,11 ; All done? jne cmf127 ; No. jmp cmf12a ; Yes. cmf127: cmp ch,8 ; End of file name? jne cmf128 ; No. cmp comand.cmchr,9 ; Exactly at point? je cmf128 ; Yes, don't output a second point. mov ah,'.' ; Output separator. mov [di],ah inc di inc comand.cmccnt cmf128: mov ah,[si] ; Get a character from first file spec. inc si mov al,[bx] ; Get another from second spec. inc bx cmp ah,al ; Compare. jne cmf12a ; Ambiguous. inc ch ; Same, count. cmp ah,' ' ; Blank? je cmf129 ; Yes, don't output. mov [di],ah inc di inc comand.cmccnt cmf129: jmp cmf126 ; Repeat. cmf12a: mov comand.cmchr,ch ; Save count of characters processed. mov ah,'$' ; Put terminator into buffer. mov [di],ah mov comand.cmcptr,di ; Save pointer for recognized characters. mov ah,prstr mov dx,comand.cmdptr int dos mov ch,comand.cmchr ; Characters processed. cmp ch,11 ; Complete file name. je cmf12c ; Yes, don't beep. cmf12b: mov ah,conout ; Beep, if not recognized. mov dl,bell int dos ; Ring the bell. cmf12c: jmp repars cmif13: mov ah,ch ; It must be a terminator. cmp ah,0 ; Test the length of the file name. jnz cmf3x cmp comand.cmcr,1 ; Is zero length OK? [21a] je cmf3z ; Return successfully. [21a] jmp cmifi9 ; If zero complain. cmf3x: cmp ah,0DH js cmf3y jmp cmifi9 ; If too long complain. cmf3y: jmp rskp ; Otherwise we have succeeded. cmf3z: push es mov ax,ds mov es,ax mov di,comand.cmfcb inc di mov cx,11 mov al,'?' repne stosb pop es mov flags.wldflg,0FFH ; Remember we had a wildcard. jmp rskp cmifi2: cmp ah,'.' jne cmifi3 inc ch mov ah,ch cmp ah,1H ; Any chars yet? jnz cmf2x jmp cmifi9 ; No, give error. cmf2x: cmp ah,0AH ; Tenth char? js cmf2y jmp cmifi9 ; Past it, give an error. cmf2y: mov dl,9H mov dh,0 mov bx,comand.cmfcb add bx,dx ; Point to file type field. mov comand.cmfcb2,bx mov ch,9H ; Say we've gotten nine. jmp cmifi1 ; Get the next char. cmifi3: cmp ah,':' jne cmifi4 inc ch cmp ch,2H ; Is it in right place for a drive? je cmif3x jmp cmifi9 ; If not, complain. cmif3x: mov ch,0 ; Reset char count. mov flags.droflg,1 ; Override default drive. [21a] mov flags.nmoflg,0 ; Not so fast. [21a] mov bx,comand.cmfcb2 mov al,':' ; Use for parsing drive name. mov [bx],al dec bx ; Point to drive spec. mov si,bx push es mov ax,ds mov es,ax mov di,offset tbuff ; Borrow this buffer. mov ah,prsfcb int dos pop es cmp al,0 ; OK return code? je cmif3y ; Yes, keep going. ; mov ah,[bx] ; Get the drive name. ; sub ah,'@' ; Get the drive number. ; cmp ah,drives ; Did user specify a non-existant drive? [21a] ; jle cmif3y ; Nope, so continue. [21a] mov dx,offset cmer07 ; Fail with this error message. [21a] jmp cmif9x ; [21a] cmif3y: mov comand.cmfcb2,bx ; Put rest of filename starting here. [21a] mov ah,[bx] ; Pick up drive specified. sub ah,'@' ; Get real value. mov bx,comand.cmfcb mov [bx],ah ; Put it in the fcb. push bx mov al,' ' ; Overwrite the drive and ":". inc bx mov [bx],al inc bx mov [bx],al pop bx jmp cmifi1 cmifi4: cmp ah,'*' jne cmifi7 cmp comand.cmrflg,1 ; In receive mode? [21a] jne cmif4x ; Jump out of range. [21a] mov dx,offset cmer06 ; Set the error message. [21a] jmp cmif9x ; Fail - no wildcard allowed. [21a] cmif4x: mov ah,ch ; [21a] cmp ah,8H ; Is this in the name or type field? jns cmifi5 ; Type. mov cl,8H ; Say we have eight chars. js cmifi6 ; Name field. jmp cmifi9 ; If its where the dot should be give up. cmifi5: mov cl,0CH ; Three chars. cmifi6: mov flags.wldflg,0FFH ; Remember we had a wildcard. mov bx,comand.cmfcb2 ; Get a pointer into the FCB. mov ah,'?' mov [bx],ah ; Put a question mark in. inc bx mov comand.cmfcb2,bx inc ch mov ah,ch cmp ah,cl jl cmifi6 ; Go fill in another. jmp cmifi1 ; Get the next char. cmifi7: cmp ah,03DH ; Equals sign (wildcard)? jne cmif7x cmp comand.cmrflg,1 ; In receive mode? [21a] jne cmif7y ; No, so it's ok. [21a] mov dx,offset cmer06 ; Set the error message. [21a] jmp cmif9x ; Fail - no wildcard allowed. [21a] cmif7y: mov ah,'?' ; New label. [21a] mov flags.wldflg,0FFH ; Say we have a wildcard. jmp cmifi8 ; Put into FCB. cmif7x: cmp ah,'0' jl cmif8x cmp ah,'z'+1 jns cmif8x cmp ah,'A' ; Don't capitalize non-alphabetics. jl cmifi8 and ah,137O ; Capitalize. cmifi8: mov bx,comand.cmfcb2 ; Get the pointer into the FCB. mov [bx],ah ; Put the char there. inc bx mov comand.cmfcb2,bx mov flags.nmoflg,1 ; Overriding name from host. [21a] inc ch jmp cmifi1 cmif8x: push es mov cx,ds mov es,cx ; Scan uses ES register. mov di,offset spchar ; Special chars. mov cx,spclen ; How many of them. cmp dosnum,0 ; Under version 2.0 je cmif8y mov di,offset spchar2 mov cx,spc2len cmif8y: mov al,ah ; Char is in al. repnz scasb ; Search string for input char. cmp cx,0 ; Was it there? pop es jnz cmifi8 cmifi9: mov dx,offset cmer02 cmif9x: mov ah,prstr int dos mov flags.droflg,0 ; Not overriding drive. [21a] mov flags.nmoflg,0 ; Or name to save file under. [21a] mov comand.cmrflg,0 ; Reset this flag too. [21a] ret cmofil: jmp cmifil ; For now, the same as CMIFI. ; Parse arbitrary text up to a CR. Put chars into data buffer sent to ; the host (pointed to by BX). Called with text of help message in DX. ; Return updated pointer in BX and input size in AH. cmtext: mov comand.cmptab,bx ; Save pointer to data buffer. [8 start] mov cmthlp,dx ; Save the help message. mov cl,0 ; Init the char count. cmtxt1: mov comand.cmsflg,0 ; Get all spaces. [25] call cmgtch ; Get a char. test ah,80H ; is high-order bit on? jz cmtxt5 ; Nope, put into the buffer. and ah,07FH cmp ah,' ' je cmtxt5 cmp ah,esc ; An escape? jne cmtxt2 mov ah,conout mov dl,bell ; Ring a bell. int dos mov comand.cmaflg,0 ; Reset action flag. dec comand.cmcptr ; Move pointer to before the escape. dec comand.cmdptr dec comand.cmccnt ; Decrement count. jmp cmtxt1 ; Try again. cmtxt2: cmp ah,'?' ; Asking a question? jz cmtx30 cmp ah,ff ; Formfeed? jne cmtx2x call cmblnk cmtx2x: mov ah,cl ; Return count in AH. mov bx,comand.cmptab ; Return updated pointer. jmp rskp cmtx30: mov comand.cmaflg,0 ; Reset action flag to zero. inc comand.cmdptr ; count the ? cmp cl,0 ; Is "?" first char? jne cmtxt5 ; No, just add to buffer. dec comand.cmcptr ;[ESC] (moved 3 lines) Don't keep in buffer. dec comand.cmccnt ;[ESC] Don't conut it. dec comand.cmdptr ;[ESC] don't count if printing help. mov ah,prstr ; Else, give some help. mov dx,cmthlp ; Address of help message. int dos mov ah,prstr mov dx,offset crlf ; Print a crlf. int dos mov ah,prstr mov dx,comand.cmprmp ; Reprint the prompt. int dos mov bx,comand.cmdptr ; Get the pointer into the buffer. mov byte ptr [bx],'$' mov ah,prstr mov dx,offset comand.cmdbuf int dos jmp cmtxt1 ; And keep going. cmtxt5: inc cl ; Increment the count. mov bx,comand.cmptab ; Pointer into destination array. mov [bx],ah ; Put char into the buffer. inc bx mov comand.cmptab,bx jmp cmtxt1 ; [8 end] cmgetc: cmp taklev,0 jne cmget1 jmp cmge10 ; no take file, get from keyboard cmget1: push bx push si mov bx,takadr mov ax,[bx].takcnt or ax,[bx].takcnt+2 jnz cmget5 cmget2: mov al,byte ptr [bx].takfcb ; get first byte of fcb cmp al,0ffh ; is it really a macro? je cmget4 ; yes, better not try to close it cmp al,0feh ; or maybe a file handle? je cmget3 ; yes, close w/2.0 call mov ah,closf lea dx,[bx].takfcb int dos jmp short cmget4 ; skip over alternate close cmget3: mov bx,word ptr [bx].takfcb+1 ; this is where file handle is stored mov ah,close2 ; use 2.0 close int dos cmget4: dec taklev sub takadr,size takinfo pop si pop bx mov al,cr ; end with carriage return... ret cmget5: cmp [bx].takchl,0 ; Any chars left in buffer? jne cmget6 call takrd cmget6: dec [bx].takchl sub [bx].takcnt,1 ; DEC doesn't set carry!! sbb [bx].takcnt+2,0 mov si,[bx].takptr lodsb mov [bx].takptr,si cmp al,ctlz ; maybe control-z? je cmget2 ; yes, close take file (has to be before pops) pop si pop bx cmp al,lf ; linefeed? jne cmget7 cmp flags.takflg,0 je cmgetc ; yes, ignore it cmget7: cmp al,';' ; maybe a semicolon? je cmget9 cmp flags.takflg,0 ; Echo contents of take file? je cmget8 push dx mov dl,al mov ah,conout int dos pop dx cmget8: ret ; else just return... ; semicolon seen, ignore chars until cr cmget9: call cmgetc ; get a character? cmp al,cr ; carriage return? jne cmget9 ; no, keep reading ret ; else return it cmge10: mov ah,coninq ; Get a char. cmp flags.debug,0 ; in debug mode? je cmge11 ; yes, go on mov ah,8 ; else use read that recognizes ^C cmge11: int dos push ax ; save the char cmp al,bs ; backspace? je cmge13 ; yes, skip echo cmp al,' ' ; printable? jae cmge12 ; yes, no translation needed cmp al,cr ; this is printable je cmge12 cmp al,lf je cmge12 cmp al,tab je cmge12 mov al,' ' ; else echo a space cmge12: mov dl,al ; put char here mov ah,conout int dos ; echo it ourselves... cmge13: pop ax ; and return it cmp al,'C'-40H ; control-C? je cmge15 ; yes, go handle cmp al,';' ; semicolon? je cmget9 ; yes, ignore rest of line... cmp al,tab jne cmge14 mov al,' ' cmge14: ret cmge15: mov dx,offset ctcmsg mov ah,prstr int dos mov flags.cxzflg,'C' ; remember ^C'd mov sp,cmdstk ; restore command stack ptr ret ; and fail ; Come here is user types ^W when during input. cntrlw: mov ah,prstr mov dx,offset escspc int dos dec comand.cmccnt ; Don't include it in the count. dec comand.cmcptr ; Back up past the ^W. mov cl,comand.cmccnt mov ch,0 jcxz ctlw2 pushf push es std ; Scan backwards. mov ax,ds mov es,ax ; Point to the data area. mov di,comand.cmcptr ; Looking from here. dec di mov al,' ' repe scasb ; Look for non-space. je ctlw1 ; All spaces, nothing else to do inc di ; move back to non-space inc cx repne scasb ; look for a space jne ctlw1 ; no space, leave ptrs alone inc di inc cx ; skip back over space ctlw1: inc di mov comand.cmccnt,cl ; update count mov cx,comand.cmcptr ; remember old ptr mov comand.cmcptr,di ; update pointer sub cx,di ; this is characters moved mov al,bs ; backspace cld mov di,offset tbuff ; temporary buffer rep stosb ; put enough spaces in mov byte ptr [di],'$' ; end buffer mov dx,offset tbuff mov ah,prstr int dos ; back up cursor call clearl ; clear line pop es popf ret ; and return ctlw2: mov ah,conout mov dl,bell int dos ret cminbf: push dx push bx mov cx,dx ; Save value here too. mov ah,comand.cmaflg ; Is the action char flag set? cmp ah,0 je cminb1 jmp cminb9 ; If so get no more chars. cminb1: inc comand.cmccnt ; Increment the char count. call cmgetc mov ah,al ; Keep char in 'ah'. mov bx,comand.cmcptr ; Get the pointer into the buffer. mov [bx],ah ; Put it in the buffer. inc bx mov comand.cmcptr,bx cmp ah,'W'-64 ; Is it a ^W? jne cmnb11 call cntrlw ; Kill the previous word. jmp repars cmnb11: cmp ah,25O ; Is it a ^U? jne cminb2 cmnb12: call ctlu ; Clear out the line. mov ah,prstr mov dx,comand.cmprmp ; Print the prompt. int dos mov bx,offset comand.cmdbuf mov comand.cmcptr,bx ; Reset the point to the start. mov comand.cmccnt,0 ; Zero the count. mov dx,cx ; Preserve original value of dx. jmp repars ; Go start over. cminb2: cmp ah,bs ; Or backspace? jz cminb3 cmp ah,del ; Delete? jne cminb4 cminb3: call dodel ; Delete a character. mov ah,comand.cmccnt ; Decrement the char count by two. dec ah dec ah cmp ah,0 ; Have we gone too far? jns cmnb32 ; If not proceed. mov ah,conout ; Ring the bell. mov dl,bell int dos jmp cmnb12 ; Go reprint prompt and reparse. cmnb32: mov comand.cmccnt,ah ; Save the new char count. mov ah,prstr ; Erase the character. mov dx,offset clrspc int dos mov bx,comand.cmcptr ; Get the pointer into the buffer. dec bx ; Back up in the buffer. dec bx mov comand.cmcptr,bx jmp repars ; Go reparse everything. cminb4: cmp ah,'?' ; Is it a question mark. jz cminb6 cmp ah,esc ; Is it an escape? jz cminb8 cmp ah,cr ; Is it a carriage return? jz cminb5 cmp ah,lf ; Is it a line feed? jz cminb5 cmp ah,ff ; Is it a formfeed? jne cminb7 call cmblnk call locate cminb5: mov ah,comand.cmccnt ; Have we parsed any chars yet? cmp ah,1 jnz cminb6 jmp prserr ; If not, just start over. cminb6: mov ah,0FFH ; Set the action flag. mov comand.cmaflg,ah jmp cminb9 cminb7: jmp cminb1 ; Get another char. cminb8: mov ah,prstr ; Don't print the escape char. mov dx,offset escspc int dos jmp cminb6 cminb9: pop bx pop dx ret cmgtch: push cx push bx push dx cmgtc1: mov ah,comand.cmaflg cmp ah,0 ; Is it set. jne cmgt10 call cminbf ; If the action char flag is not set get more. cmgt10: mov bx,comand.cmdptr ; Get a pointer into the buffer. mov ah,[bx] ; Get the next char. inc bx mov comand.cmdptr,bx cmp ah,' ' ; Is it a space? jz cmgtc2 cmp ah,tab ; Or a tab? jne cmgtc3 cmgtc2: mov ah,comand.cmsflg ; Get the space flag. cmp ah,0 ; Was the last char a space? jne cmgtc1 ; Yes, get another char. mov ah,0FFH ; Set the space flag. mov comand.cmsflg,ah mov ah,' ' pop dx pop bx jmp cmgtc5 cmgtc3: mov al,0 mov comand.cmsflg,al ; Zero the space flag. pop dx pop bx cmp ah,esc jz cmgtc5 cmp ah,'?' ; Is the user curious? jz cmgtc4 cmp ah,cr jz cmgtc4 cmp ah,lf jz cmgtc4 cmp ah,ff je cmgtc4 pop cx ret ; Not an action char, just return. cmgtc4: dec comand.cmdptr cmgtc5: or ah,80H ; Make the char negative to indicate pop cx ret ; it is a terminator. CMND ENDP ; This address is jumped to on reparse. PARSE PROC NEAR repars: mov sp,comand.cmostp ; new sp <-- old sp mov bx,offset comand.cmdbuf mov comand.cmdptr,bx mov ah,0FFH mov comand.cmsflg,ah jmp comand.cmrprs ; go back to reparse address ; This address can be jumped to on a parsing error. prserr: mov sp,comand.cmostp ; Set new sp to old one. mov bx,offset comand.cmdbuf mov comand.cmcptr,bx ; Initialize the command pointer. mov comand.cmdptr,bx mov ah,0 mov comand.cmaflg,ah ; Zero the flags. mov comand.cmccnt,ah mov comand.cmsflg,0FFH cmp taklev,0 ; in take cmd? jne prser1 ; yes, don't print prompt mov ah,prstr mov dx,offset crlf int dos mov ah,prstr ; Print the prompt. mov dx,comand.cmprmp ; Get the prompt. int dos ; Instead return to before the prompt call. prser1: jmp comand.cmrprs PARSE ENDP ; FCB must be remembered if found "*" in filename. [7 start] ; Copy from place addressed by BX to place addressed by DI. ; Also use to get the filename to the FCB from the DTA. FCBCPY PROC NEAR push es push si mov ax,ds mov es,ax ; make sure destination segment is correct mov ch,0 ; high-order part of length jcxz fcbcp1 ; zero argument (is this necessary???) mov si,bx ; this is source rep movsb ; copy the whole thing fcbcp1: pop si pop es ret ; and return FCBCPY ENDP ; Jumping to this location is like retskp. It assumes the instruction ; after the call is a jmp addr. RSKP PROC NEAR pop bp add bp,3 push bp ret RSKP ENDP ; Jumping here is the same as a ret. R PROC NEAR ret R ENDP code ends end //go.sysin dd * made=TRUE if [ $made = TRUE ]; then /bin/chmod 640 mscmd.asm /bin/echo -n ' '; /bin/ls -ld mscmd.asm fi /bin/echo 'Extracting mscomm.asm' sed 's/^X//' <<'//go.sysin dd *' >mscomm.asm public data, spack, rpack, rpack5, portval, port1, port2, hierr include msdefs.h gettim equ 2CH ; Get the time of day. maxlp equ 100 ; Use as number of times to loop (in inchr). true equ 1 false equ 0 mntrgl equ bufsiz/4 ; Low point = 1/4 of the way full. maxpack equ 60H ; largest packet we can handle datas segment public 'datas' extrn flags:byte, trans:byte, pack:byte, count:word, xofsnt:byte port1 prtinfo <0FFFH,0,defpar,1,0,defhand,floxon> port2 prtinfo <0FFFH,0,defpar,1,0,defhand,floxon> portval dw port1 ; Default is to use port 1. hierr db 0 ; Non-ascii char (non-zero if yes). spmes db 'Spack: $' rpmes db 'Rpack: $' crlf db cr,lf,'$' infms0 db 'Waiting .....$' hibit db 'Warning - Non Ascii char$' cemsg db 'User intervention$' temp dw 0 tmp db ?,'$' pktptr dw ? ; Position in receive packet. incnt dw ? ; Number of chars read in from port. loopct db ? ; Loop counter. time dw ? ; When we should timeout. dw ? ; Want a double word. packet db ?,?,?,? ; Packet (data is part of it). data db 5AH DUP(?) ; Data and checksum field of packet. recpkt db maxpack DUP(?) ; Receive packet storage (use the following). crctab dw 00000H dw 01081H dw 02102H dw 03183H dw 04204H dw 05285H dw 06306H dw 07387H dw 08408H dw 09489H dw 0A50AH dw 0B58BH dw 0C60CH dw 0D68DH dw 0E70EH dw 0F78FH crctb2 dw 00000H dw 01189H dw 02312H dw 0329BH dw 04624H dw 057ADH dw 06536H dw 074BFH dw 08C48H dw 09DC1H dw 0AF5AH dw 0BED3H dw 0CA6CH dw 0DBE5H dw 0E97EH dw 0F8F7H datas ends code segment public extrn prtchr:near, clrbuf:near, outchr:near extrn sppos:near, stpos:near, biterr:near, intmsg:near extrn clearl:near, rppos:near, errpack:near assume cs:code, ds:datas ; Packet routines ; Send_Packet ; This routine assembles a packet from the arguments given and sends it ; to the host. ; ; Expects the following: ; AH - Type of packet (D,Y,N,S,R,E,F,Z,T) ; ARGBLK - Packet sequence number ; ARGBK1 - Number of data characters ; Returns: +1 always SPKT PROC NEAR spack: push ax ; Save the packet type. call clrbuf ; Clear the input buffer. [20e] mov bx,offset packet ; Get address of the send packet. mov ah,trans.ssoh ; Get the start of header char. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ax,pack.argbk1 ; Get the number of data chars. xchg ah,al mov al,trans.chklen ; Length of checksum. dec al ; Extra length of checksum. add ah,' '+3 ; Real packet character count made printable. add ah,al ; Account for checksum length in count. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ch,0 ; For the 16 bit checksum. mov cl,ah ; Start the checksum. mov ax,pack.argblk ; Get the packet number. add al,' ' ; Add a space so the number is printable. mov [bx],al ; Put in the packet. inc bx ; Point to next char. add cx,ax ; Add the packet number to the checksum. pop ax ; Get the packet type. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov al,0 xchg ah,al add cx,ax ; Add the type to the checksum. mov dx,pack.argbk1 ; Get the packet size. spack2: cmp dx,0 ; Are there any chars of data? jz spack3 ; No, finish up. dec dx ; Decrement the char count. mov al,[bx] ; Get the next char. inc bx ; Point to next char. mov ah,0 add cx,ax ; Add the char to the checksum. cmp al,0 jns spack2 cmp hierr,0ffH ; Printed message already? je spack2 ; Yes, then that's it. push bx push cx push dx call biterr pop dx pop cx pop bx mov hierr,0FFH ; set err flag. jmp spack2 ; Go try again. spack3: cmp trans.chklen,2 ; What kind of checksum are we using. je spackx ; 2 characters. jg spacky ; 3 characters. mov ah,cl ; 1 char: get the character total. mov ch,cl ; Save here too (need 'cl' for shift). and ah,0C0H ; Turn off all but the two high order bits. mov cl,6 shr ah,cl ; Shift them into the low order position. mov cl,ch add ah,cl ; Add it to the old bits. and ah,3FH ; Turn off the two high order bits. (MOD 64) add ah,' ' ; Add a space so the number is printable. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. jmp spackz ; Add EOL char. spacky: mov al,0 ; Get a null. mov [bx],al ; To determine end of buffer. push bx ; Don't lose our place. mov bx,offset packet+1 ; First checksummed character. call crcclc ; Calculate the CRC. pop bx push cx mov ax,cx ; Manipulate it here. and ax,0F000H ; Get 4 highest bits. mov cl,4 shr ah,cl ; Shift them over 4 bits. add ah,' ' ; Make printable. mov [bx],ah ; Add to buffer. inc bx pop cx ; Get back checksum value. spackx: push cx ; Save it for now. and cx,0FC0H ; Get bits 6-11. mov ax,cx mov cl,6 shr ax,cl ; Shift them bits over. add al,' ' ; Make printable. mov [bx],al ; Add to buffer. inc bx pop cx ; Get back the original. and cx,003FH ; Get bits 0-5. add cl,' ' ; Make printable. mov [bx],cl ; Add to buffer. inc bx spackz: mov ah,trans.seol ; Get the EOL the other host wants. mov [bx],ah ; Put in the packet. inc bx ; Point to next char. mov ah,0 ; Get a null. mov [bx],ah ; Put in the packet. cmp flags.debug,0 ; debug mode. je spack4 inc bx mov ah,'$' mov [bx],ah call sppos call clearl ; Clear to end of line. mov dx,offset crlf mov ah,prstr int dos call clearl ; Next line too. call sppos ; Reposition cursor. mov ah,prstr mov dx,offset spmes int dos mov dx,offset packet mov ah,prstr int dos ; debug end. spack4: call outpkt ; Call the system dependent routine. jmp r jmp rskp SPKT ENDP ; Write out a packet. OUTPKT PROC NEAR mov dh,trans.spad ; Get the number of padding chars. outpk2: dec dh cmp dh,0 jl outpk3 ; If none left proceed. mov ah,trans.spadch ; Get the padding char. call outchr ; Output it. jmp r ; Say we failed. [25] jmp outpk2 outpk3: mov bx,offset packet ; Point to the packet. outlup: mov ah,[bx] ; Get the next character. cmp ah,0 ; Is it a null? jnz outlp2 jmp rskp outlp2: call outchr ; Output the character. jmp r inc bx ; Increment the char pointer. jmp outlup OUTPKT ENDP ; Calculate the CRC. Returns the CRC in CX. Destroys: BX, AX. crcclc: push dx push si mov dx,0 ; Initial CRC value is 0. crc0: mov al,[bx] ; Get the first char of the string. cmp al,0 ; If null, then we're done. je crc1 inc bx xor al,dl ; Xor input with lo order byte of CRC. mov ah,al ; Get a copy. and ah,0F0H ; Get hi 4 bits. mov cl,4 shr ah,cl ; Right justify. and al,0FH ; Get lo 4 bits. push bx mov si,offset crctb2 ; Low portion of CRC factor. mov bh,0 mov bl,al add bl,al ; Get word index. mov cx,[si+bx] ; Low portion. mov si,offset crctab ; High portion of CRC factor. mov bh,0 mov bl,ah add bl,ah ; Get word index. mov bx,[si+bx] xor bx,cx ; Add the two. mov cl,8 shr dx,cl ; Shift CRC 8 bits to the right. xor dx,bx ; XOR table value and CRC. pop bx ; Retrieve index. jmp crc0 crc1: mov cx,dx ; Return it in CX. pop si pop dx ret ; Receive_Packet ; This routine waits for a packet arrive from the host. It reads ; chars until it finds a SOH. RPACK PROC NEAR rpack5: call inpkt ; Read up to a carriage return. jmp r ; Return bad. rpack0: call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jne rpack0 ; No, go until it is. rpack1: call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov ch,0 ; For 16-bit checksum. mov cl,al ; Start the checksum. mov ah,0 mov pack.argbk1,ax ; Save the data count. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov ah,0 add cx,ax ; Add it to the checksum. sub al,' ' ; Get the real packet number. mov ah,0 mov pack.argblk,ax ; Save the packet number. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov ah,0 mov temp,ax ; Save the message type. [11] add cx,ax ; Add it to the checksum. ; Start of change. ; Now determine block check type for this packet. Here we violate the layered ; nature of the protocol by inspecting the packet type in order to detect when ; the two sides get out of sync. Two heuristics allow us to resync here: ; a. An S packet always has a type 1 checksum. ; b. A NAK never contains data, so its block check type is LEN-2. push cx mov cl,al mov ax,pack.argbk1 ; Get back the size. sub al,34 ; unchar(len) - 2, for SEQ & TYPE fields. mov ah,trans.chklen ; Checksum length we expect. cmp cl,'S' ; Is this an "S" packet? jne rpk0 ; Nope. mov ah,1 ; Yes, use 1 char checksum. rpk0: cmp cl,'N' ; Is this a NAK? jne rpk1 ; Nope. mov ah,al ; So, len - 2 is checksum type. rpk1: mov trans.chklen,ah ; Then, this is the chksum length. sub al,ah ; Real size of data. mov dh,al ; Need it here. mov ah,0 mov pack.argbk1,ax ; And here. pop cx ; End of change. mov bx,offset data ; Point to the data buffer. rpack2: dec dh ; Any data characters? js rpack3 ; If not go get the checksum. call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jz rpack1 ; Yes, then go start over. mov [bx],al ; Put the char into the packet. inc bx ; Point to the next character. mov ah,0 add cx,ax ; Add it to the checksum. jmp rpack2 ; Go get another. rpack3: call getchr ; Get a character. jmp r ; Hit the carriage return, return bad. cmp al,trans.rsoh ; Is the char the start of header char? jnz rpk3x jmp rpack1 ; Yes, then go start over. rpk3x: sub al,' ' ; Turn the char back into a number. cmp trans.chklen,2 ; What checksum length is in use. je rpackx ; Two character checksum. jg rpacky ; Three character CRC. mov dh,cl ; 1 char - get the character total. and dh,0C0H ; Turn off all but the two high order bits. mov ch,cl mov cl,6 shr dh,cl ; Shift them into the low order position. mov cl,ch add dh,cl ; Add it to the old bits. and dh,3FH ; Turn off the two high order bits. (MOD 64) cmp dh,al ; Are they equal? jz rpack4 ; If so finish up. jmp rpack6 ; No, we fail. rpacky: mov tmp,al ; Save value from packet here. mov ah,0 ; Three character CRC. push bx mov bx,pktptr ; Where we are in the packet. dec bx mov [bx],ah ; Add null to signify end of buffer. mov bx,offset recpkt+1 ; Where data for CRC is. call crcclc ; Calculate the CRC and put into CX. pop bx push cx mov ax,cx ; Manipulate it here. and ax,0F000H ; Get 4 highest bits. mov cl,4 shr ah,cl ; Shift them over 4 bits. pop cx ; Get back checksum value. cmp ah,tmp ; Is what we got == what we calculated? jne rpack6 call getchr ; Get next character of checsum. jmp r ; Failed. cmp al,trans.rsoh ; Restarting? jz rpack7 sub al,' ' ; Get back real value. rpackx: mov tmp,al ; Save here for now. push cx ; Two character checksum. and cx,0FC0H ; Get bits 6-11. mov ax,cx mov cl,6 shr ax,cl ; Shift them bits over. pop cx ; Get back the original. cmp al,tmp ; Are they equal? jne rpack6 ; No, we fail. call getchr ; Get last character of checsum. jmp r ; Failed. cmp al,trans.rsoh ; Restarting? jz rpack7 sub al,' ' ; Get back real value. and cx,003FH ; Get bits 0-5. cmp al,cl ; Do the last chars match? jne rpack6 rpack4: mov ah,0 mov [bx],ah ; Put a null at the end of the data. mov ax,temp ; Get the type. [11] xchg al,ah ; Packet type should be in AH. jmp rskp rpack6: ret rpack7: jmp rpack1 ; For the jump out of range. RPACK ENDP INPKT PROC NEAR mov bl,flags.cxzflg ; Remember original value. [20b] mov tmp,bl ; Store it here. [20b] inpkt1: mov bx,offset recpkt ; Point to the beginning of the packet. mov incnt,0 inpkt2: call inchr ; Get a character. jmp inpkt8 ; Return failure. [20b] nop ; Make it three bytes long. [20b] mov [bx],ah ; Put the char in the packet. inc bx inc incnt cmp ah,trans.reol ; Is it the EOL char? je inpkt3 ; ended by eol, keep going cmp incnt,maxpack ; is it too big? jbe inpkt2 ; no, keep going jmp inpkt1 ; else just start over inpkt3: cmp incnt,1 ; Ignore bare CR. [2 start] je inpkt1 mov bp,portval cmp ds:[bp].hndflg,0 ; Waiting for handshake? jz inpkt5 ; If not then proceed. inpkt4: call inchr ; Wait for the turn around char. jmp inpkt8 ; Return failure. [20b] nop ; Make it three bytes long. [20b] mov bp,portval cmp ah,ds:[bp].hands ; Is it the IBM turn around character? jne inpkt4 ; If not, go until it is. inpkt5: cmp flags.debug,0 ; In debug mode? je inpkt6 mov ah,'$' mov [bx],ah call rppos call clearl ; Clear to end of line. mov dx,offset crlf mov ah,prstr int dos call clearl ; Next line too. call rppos ; Reposition cursor. mov ah,prstr mov dx,offset rpmes int dos mov dx,offset recpkt mov ah,prstr int dos ; debug end. inpkt6: mov bx,offset recpkt mov pktptr,bx ; Save the packet pointer. mov bl,tmp ; Get the original value. [20b] cmp bl,flags.cxzflg ; Did ^X/^Z flag change? [20b] je inpkt7 ; If not, just return. [20b] cmp flags.cxzflg,'E' ; Error packet? je inpkt9 call intmsg ; Else, say we saw the interrupt. [20b] inpkt7: jmp rskp ; If so we are done. inpkt8: cmp flags.cxzflg,'C' ; Did the user type a ^C? [25] jne inpkt9 mov pack.state,'A' ret inpkt9: cmp flags.cxzflg,'E' ; How about ^E? jne inpk10 ; No just go on. mov bx,offset cemsg ; Null message for error packet. call errpack mov pack.state,'A' ret inpk10: mov bl,tmp ; Get the original value. [20b] cmp bl,flags.cxzflg ; Did ^X/^Z flag change? [20b] je inpk11 ; If not, just return failure. [20b] call intmsg ; Else, say we saw the interrupt. [20b] inpk11: jmp r INPKT ENDP inchr: cmp flags.timflg,0 ; Are timeouts turned off. je inchr1 ; Yes, so skip this stuff. cmp trans.stime,0 ; Don't time out? je inchr1 ; Yes, so skip this stuff. mov loopct,0 ; Use to check for timeout. mov ah,gettim ; Get the time. int dos mov time,cx mov time+2,dx mov ah,0 mov al,trans.stime ; Timeout when getting data. mov cl,8 shl ax,cl ; Move timeout to seconds field. add time+2,ax ; If get to this time, then timeout. jnc inchr1 inc time inchr1: call prtchr ; Is there a character to read? jmp inchr6 ; Got one. mov dl,0FFH ; To read in a char. mov ah,dconio ; Is a char on the console? int dos jz inchr2 ; If not go look for another char. mov ah,al cmp ah,cr ; Is it a carriage return? je inchr5 ; If yes, then leave. cmp ah,'Z'-100O ; Control-Z? [20b] je inchr4 ; Yes - flag it. [20b] cmp ah,'X'-100O ; Control-X? [20b] je inchr4 ; Yes - flag it. [20b] cmp ah,'E'-100O ; Control-E? je inchr4 ; Flag it and get rest of packet. cmp ah,'C'-100O ; Control-C? [25] jne inchr2 ; No, then wait for input. [25] add ah,100O ; Make it printable. [25] mov flags.cxzflg,ah ; Save it. [25] ret ; Return right away. [25] inchr2: cmp flags.timflg,0 ; Are timeouts turned off? je inchr1 ; Yes, just check for more input. cmp trans.stime,0 ; Doing time outs? je inchr1 ; No, just go check for more input. inc loopct cmp loopct,maxlp ; Times to go without checking time. jne inchr1 ; Don't check yet. mov ah,gettim ; Get the current time. int dos mov ax,time sub ax,cx ; Check hours and minutes. jl inchr5 ; Over the limit so fail. jg inchr3 ; Under the limit, keep going. mov ax,time+2 sub ax,dx ; Else, check seconds and hundreds of seconds. jle inchr5 ; Return failure. inchr3: mov loopct,0 ; Reset counter. jmp inchr1 inchr4: add ah,100O ; Make it printable. [20b] mov flags.cxzflg,ah ; Remember what we saw. [20b] jmp inchr2 ; Continue getting input. [20b] inchr5: ret inchr6: mov ah,al mov bp,portval ; Point to current port structure. cmp ds:[bp].parflg,parnon ; Is the parity none? [10] je inchr7 ; We're done. [10] and ah,7FH ; Turn off the parity bit. inchr7: cmp ds:[bp].floflg,0 ; Doing any flow control? jne inchr8 ; Yes, check it out. jmp rskp ; No, just return the data. inchr8: cmp xofsnt,true ; Have we sent flow char (XOFF)? je inchr9 ; Yes. jmp rskp ; No, just return. inchr9: cmp count,mntrgl ; Under the low trigger point? jb inchra ; Yes. jmp rskp ; No, just return. inchra: push ax mov bp,portval mov ax,ds:[bp].flowc ; Get flow control char (AH = XON, AL = XOFF). call outchr ; Send it (XON). mov xofsnt,false ; Turn off the flag. pop ax jmp rskp ; Return the character. ; Return next character in AL. GETCHR PROC NEAR push bx mov bx,pktptr ; Get the packet pointer. mov al,[bx] ; Get the char. inc bx mov pktptr,bx pop bx ; Restore BX. cmp al,trans.reol ; Is it the EOL char? jne getcr2 ; If not return retskp. ret ; If so return failure. getcr2: jmp rskp GETCHR ENDP ; Jumping to this location is like retskp. It assumes the instruction ; after the call is a jmp addr. RSKP PROC NEAR pop bp add bp,3 push bp ret RSKP ENDP ; Jumping here is the same as a ret. R PROC NEAR ret R ENDP code ends end //go.sysin dd * made=TRUE if [ $made = TRUE ]; then /bin/chmod 640 mscomm.asm /bin/echo -n ' '; /bin/ls -ld mscomm.asm fi /bin/echo 'Extracting msdefs.h' sed 's/^X//' <<'//go.sysin dd *' >msdefs.h verdef macro db ' Kermit-MS V2.26' endm BELL EQU 07Q TAB EQU 11Q LF EQU 12Q FF EQU 14Q CR EQU 15Q XXON EQU 21Q XXOFF EQU 23Q ESC EQU 33Q DEL EQU 177Q BS EQU 08H CTLZ EQU 1AH SOH EQU 01H ; Start of header char. DOS EQU 21H CONIN EQU 01H CONOUT EQU 02H RDRIN EQU 03H PUNOUT EQU 04H LSTOUT EQU 05H DCONIO EQU 06H CONINQ EQU 07H ; quiet console input PRSTR EQU 09H CONSTAT EQU 0BH SELDSK EQU 0EH ; Select disk. [21a] OPENF EQU 0FH CLOSF EQU 10H SFIRST EQU 11H SNEXT EQU 12H DELF EQU 13H READF EQU 14H ; Read from the file. WRITEF EQU 15H MAKEF EQU 16H GCURDSK EQU 19H ; Current disk. [21a] SETDMA EQU 1AH PRSFCB equ 29H ; parse an fcb. DOSVER equ 30H ; dos version # OPEN2 EQU 3DH ; 2.0 open CLOSE2 EQU 3EH ; 2.0 close READF2 EQU 3FH ; 2.0 read. LSEEK EQU 42H ; 2.0 lseek IOCTL EQU 44H WRITEF2 EQU 40H ; 2.0 write GCD equ 47H ; 2.0 get current directory. PAREVN EQU 00H ; Even parity. [10 start] PARMRK EQU 01H ; Mark parity. PARNON EQU 02H ; No parity. PARODD EQU 03H ; Odd parity. PARSPC EQU 04H ; Space parity. CMKEY EQU 01H ; Parse a keyword. CMIFI EQU 02H ; Parse an input file spec (can be wild). CMOFI EQU 03H ; Parse an output file spec. CMCFM EQU 04H ; Parse a confirm. CMTXT EQU 05H ; Parse arbitrary text up to CR. [8] FLOXON EQU 1113H ; Use XON/XOFF for flow control. FLONON EQU 0 ; Don't do flow control. DEFHAND EQU XON ; Use XON as default handshake. DMASIZ EQU 80H ; Size of DMA. FCBSIZ EQU 25H MAXTAK EQU 05H ; Max number of TAKE's allowed. [25t] MAXTRY EQU 05Q ; Default number of retries on a packet. IMXTRY EQU 20Q ; Default number of retries send initiate. DEFESC EQU ']'-100Q ; The default escape character. DRPSIZ EQU 5EH ; Default receive packet size. DSPSIZ EQU 50H ; Default send packet size. DSTIME EQU 08H ; Default send time out interval. DRTIME EQU 0DH ; Default receive time out interval. DSRVTM EQU 30 ; Default server timeout. DSPAD EQU 00H ; Default send padding. DRPAD EQU 00H ; Default receive padding. DSPADC EQU 00H ; Default send padding char. DRPADC EQU 00H ; Default receive padding char. DSEOL EQU CR ; Default send EOL char. DREOL EQU CR ; Default receive EOL char. DSSOH EQU SOH ; Default send start-of-packet char. DRSOH EQU SOH ; Default receive start-of-packet char. DSQUOT EQU '#' ; Default send quote char. DRQUOT EQU '#' ; Default receive quote char. DQBIN EQU '&' ; Default 8-bit prefix. [21b] DRPT EQU '~' ; Default repeat prefix. DCHKLEN EQU 1 ; Default checksum length. DEFPAR EQU PARNON ; Default parity (none.) IBMPAR EQU PARMRK ; IBM's parity (mark.) [10 end] bufsiz equ 2048 ; size of serial input buffer ; baud rate definitions B00455 EQU 0 ; 45.5 baud B0050 EQU 1 ; 50 baud B0075 EQU 2 ; 75 baud B0110 EQU 3 ; 110 baud B01345 EQU 4 ; 134.5 baud B0150 EQU 5 ; 150 baud B0300 EQU 6 ; 300 baud B0600 EQU 7 ; 600 baud B1200 EQU 8 ; 1200 baud B1800 EQU 9 ; 1800 baud B2000 EQU 10 ; 2000 baud B2400 EQU 11 ; 2400 baud B4800 EQU 12 ; 4800 baud B9600 EQU 13 ; 9600 baud B19200 EQU 14 ; 19200 baud B38400 EQU 15 ; 38400 baud BAUDSIZ EQU 16 ; Number of options for baud rate. ; Structure definitions. ; Modem information. mdminfo struc mddat dw 0 ; Default to port 1. [19b start] mdstat dw 0 ; Ditto. mdcom dw 0 ; Here too. mden db 0 mddis db 0 mdmeoi db 0 mdintv dw 0 ; [19b end] mdminfo ends ; Command information. cmdinfo struc cmstat db 0 ; What is presently being parsed. cmaflg db 0 ; Non-zero when an action char has been found. cmccnt db 0 ; Non-zero if a significant char is found. cmsflg db 0 ; Non-zero when the last char was a space. cmostp dw 0 ; Old stack pointer for reparse. cmrprs dw 0 ; Address to go to on reparse. cmprmp dw 0 ; Address of prompt. cmptab dw 0 ; Address of present keyword table. cmhlp dw 0 ; Address of present help. cmdbuf db 80H DUP(0) ; Buffer for command parsing. cmfcb dw 0 ; Pointer to FCB. cmfcb2 dw 0 ; Pointer to position in FCB. cmcptr dw 0 ; Pointer for next char input. cmdptr dw 0 ; Pointer into the command buffer. cmsiz dw 0 ; Size info of user input. cmkptr dw 0 ; Pointer to keyword. cmsptr dw 0 ; Place to save a pointer. cmchr db 0 ; Save char when checking ambiguity. cmrflg db 0 ; Assume parsing filename for send. [21a] cmcr db 0 ; Say whether bare CR is allowed. cmdinfo ends ; Flags information. flginfo struc belflg db 1 ; Use bell [17a -- DT] comflg db 1 ; Use COM1 by default. [19b] abfflg db 1 ; Discard incoming file if abort. [20d] debug db 0 ; Debugging mode (default off). flwflg db 1 ; File warning flag (default on). [19c] ibmflg db 0 ; IBM flag (default off). extflg db 0 ; Exit flag (default off). vtflg db 1 ; H-19 emulation. droflg db 0 ; Override default disk drive. [21a] nmoflg db 0 ; Override name from the F packet. [21a] wldflg db 0 ; Assume no "*" in fn. [7] cxzflg db 0 ; ^X/^Z to interrupt file x-fer. [20b] xflg db 0 ; Seen "X" packet. [21c] filflg db 0 ; Non-zero when nothing in DMA buffer. eoflag db 0 ; EOF flag; non-zero on EOF. getflg db 0 ; Assume normal RECEIVE (not GET). [21a] capflg db 0 ; On if capturing data. [25] takflg db 0 ; On if echo commands of TAKE file. timflg db 0 ; Say if are timing out or not. destflg db 1 ; Incoming files destination: disk or printer. eofcz db 0 ; ^Z signals eof if non-zero. remflg db 0 ; non-zero if in remote mode. flginfo ends ; Transmission parameters trinfo struc maxdat db 0 ; Max packet size for send. chklen db 1 ; Number of characters in checksum. seol db dseol ; Send EOL char. reol db dreol ; Receive EOL char. ssoh db dssoh ; Send start-of-packet character. rsoh db drsoh ; Receive start-of-packet character. squote db dsquot ; Send quote character. rquote db drquot ; Receive quote character. spsiz db dspsiz ; Send packet size. rpsiz db drpsiz ; Receive packet size. stime db dstime ; Send timeout. (Don't timeout). rtime db drtime ; Receive timeout. spad db dspad ; Send padding. rpad db drpad ; Receive padding. spadch db dspadc ; Send padding char. rpadch db drpadc ; Receive padding char. ebquot db 'Y' ; Send 8-bit quote character. escchr db defesc ; Escape character. trinfo ends pktinfo struc pktnum dw 0 ; Packet number. numpkt dw 0 ; Total number of packets sent. numrtr dw 0 ; Total number of retries. numtry db 0 ; Number of tries on this packet. oldtry db 0 ; Number of tries on previous packet. state db 0 ; Present state of the automaton. argblk dw 0 ; For subroutine arguments. argbk1 dw 0 argbk2 dw 0 argbk3 dw 0 pktinfo ends takinfo struc takfcb db fcbsiz dup(0) takbuf db dmasiz dup(0) takptr dw 0 takchl db 0 takcnt dw 0,0 takinfo ends ; Port Information. prtinfo struc baud dw 0 ; Default baud rate. ecoflg db 0 ; Local echo flag (default off). parflg db 0 ; Parity flag (default none.) [10] floflg db 0 ; If need flow control during file x-fer. hndflg db 0 ; If need handshake during file x-fer. hands db 0 ; Default handshake. flowc dw 0 ; Do flow control with XON/XOFF. prtinfo ends mkeyw macro key,val local junk,oldval oldval equ $ db junk,key,'$' junk equ $-oldval-2 dw val endm ; definitions for terminal handler: termarg struc flgs db ? ; flags prt db ? ; port to use (0,1) cols db ? ; # columns on screen rows db ? ; # rows on screen captr dw ? ; routine to call with captured data belld dw ? ; bell divisor klen dw ? ; length of key redefinition table ktab dw ? ; address of key redefinition table krpl dw ? ; address of key replacement table escc db ? ; escape character baudb db ? ; baud rate bits. parity db ? ; parity termarg ends ; bits for flag byte scrsam equ 80h ; on if shouldn't redraw screen capt equ 40h ; capture output emheath equ 20h ; emulate heath havtt equ 10h ; have translate table trnctl equ 08h ; translate control chars modoff equ 04h ; mode line off lclecho equ 01h ; local echo //go.sysin dd * made=TRUE if [ $made = TRUE ]; then /bin/chmod 640 msdefs.h /bin/echo -n ' '; /bin/ls -ld msdefs.h fi /bin/echo 'Extracting msfile.asm' sed 's/^X//' <<'//go.sysin dd *' >msfile.asm public bufpnt, buff, fcb, cpfcb, chrcnt, fixfcb, init, init1, public gofil, outbuf, ptchr, gtchr, gtnfil, getfil, filbuf, public encode, decode, nulref, nulr, decbuf, errpack, rptq, public origr, rptct, rptval, clrfln, cxmsg, biterr, intmsg, public rtpos, erpos,rppos, stpos,nppos,rprpos,nrtpos,sppos, public kbpos,perpos,frpos, prtscr include msdefs.h rptmin equ 3 ; At least 3 of same char in a row. ; equates for screen positioning scrfln equ 0316H ; Place for file name. scrkb equ 0416H ; Place for percent transferred. scrper equ 0516H ; Place for Kbytes transferred. scrst equ 0616H ; Place for status. scrnp equ 0816H ; Place for number of packets. scrnrt equ 0916H ; Place for number of retries. screrr equ 0A16H ; Place for error msgs. scrhi equ 0B16H ; Err when 8th bit is on. scrfr equ 0B16H ; Rename file. scrint equ 0B16H ; Acknowledge interrupt. [20b] scrsp equ 0C00H ; Place for send packet. scrrp equ 0E00H ; Place for receive packet. scrrpr equ 1100H ; Prompt when Kermit ends. datas segment public 'datas' extrn data:byte, flags:byte, trans:byte, pack:byte, hierr:byte extrn dosnum:byte outlin db cr,lf,cr,lf db cr,lf,' File name:' db cr,lf,' KBytes transferred:' db cr,lf db cr,lf db cr,lf db cr,lf,' Number of packets:' db cr,lf,' Number of retries:' db cr,lf,' Last error: None' db cr,lf,' Last warning: None' db '$' ermes4 db 'Unable to rename file$' erms10 db '?Unable to receive data$' erms11 db '?Disk full$' erms12 db '?Unable to create file$' erms17 db 'Record length exceeds size of buffer$' infms5 db 'Renaming file to $' infms7 db 'File interrupt$' infms8 db 'File group interrupt$' hibit db 'Warning - Non Ascii char$' crlf db cr,lf,'$' printer db 0,'LPT1 ' spchar db 24H,26H,23H,40H,21H,25H,27H,28H,29H,2DH db 3CH,3EH,7BH,7DH,5FH,5CH,5EH,7EH,7CH,60H spclen equ $-spchar ; Number of special chars. spchar2 db 24H,26H,23H,40H,21H,25H,27H,28H,29H,2DH db 7BH,7DH,5FH,5EH,7EH,60H spc2len equ $-spchar2 next db 0FFH ; No next character just yet. rptval db 0 ; Repeated character. rptct db 1 ; Number of times it's repeated. rptq db drpt ; Repeat prefix. origr db drpt ; Original repeat prefix. temp1 dw ? ; Temporary storage. temp2 dw ? oloc dw 0 ; Original buffer location. [21c] osiz dw 0 ; Original buffer size. [21c] chrcnt dw ? ; Number of chars in the file buffer. outpnt dw ? ; Position in packet. bufpnt dw ? ; Position in file buffer. fdtpnt dw ? ; Pointer to within our file. fcbptr dw ? ; Position in FCB. cbfptr dw ? ; Position in character buffer. filsiz dw 0 ; Double word for filesize (in bytes.) dw 0 ofilsz dw 0 ; Original file size percent adjusted (/100). tfilsz dw 0 ; Bytes transferred. dw 0 oldper dw ? ; old percentage oldkbt dw ? ; old KB transferred. wrpmsg db ? ; non-zero if we wrote percent message percnt dw 100 ; Number to divide by for a percent. bufhex dw 80H permsg db cr,' Percent transferred:$' cxzhlp db '^X cancels file, ^Z cancels batch' db ', ^E aborts protocol' db ', ^C aborts at once' db '$' asmsg db ' AS ' asmln equ $-asmsg filbuf db 60H DUP(?) ; Character buffer. buff db dmasiz DUP(?) ; Use as our DTA. fcb db fcbsiz DUP(?) ; Use as our FCB. cpfcb db fcbsiz DUP(?) ; Save FCB in case of "*". [7] decbuf db dmasiz DUP(?) ; For decoding incoming data. datas ends code segment public extrn spack:near, cmblnk:near, locate:near, nout:near extrn putmod:near, poscur:near, clearl:near, fcbcpy:near assume cs:code,ds:datas ; Position cursor for an error message. ERPOS PROC NEAR cmp flags.xflg,1 ; Packet header seen? [21c start] jne erp0 ; No, do as normal. mov dx,offset crlf mov ah,prstr int dos ret erp0: mov dx,screrr jmp poscur ERPOS ENDP ; Position cursor for number of retries message. RTPOS PROC NEAR cmp flags.xflg,1 ; Packet header seen? [21c] jne rtp0 ; No, do as normal. ret rtp0: mov dx,scrnrt jmp poscur RTPOS ENDP ; Reassure user that we acknowledge his ^X/^Z. INTMSG PROC NEAR cmp flags.xflg,0 ; Writing to screen? jne int1 ; Yes. Don't do anything. mov dx,scrint call poscur call clearl mov dx,offset infms7 ; File interrupted? cmp flags.cxzflg,'X' ; Yes. je int0 mov dx,offset infms8 ; File group interrupted. int0: mov ah,prstr int dos int1: ret INTMSG ENDP ; Print err message that found a non-standard-Ascii char in the file. BITERR PROC NEAR cmp flags.remflg,0 ; remote mode? jne biter1 ; yes, no printing. push bx mov dx,scrhi call poscur call clearl mov ah,prstr mov dx,offset hibit int dos pop bx biter1: ret BITERR ENDP ; Clear out message about interrupted file. CXMSG PROC NEAR cmp flags.xflg,0 ; Writing to screen? jne cxm0 ; Yes. Don't do anything. mov dx,scrint call poscur call clearl cxm0: ret CXMSG ENDP ; Clear out the old filename on the screen. CLRFLN PROC NEAR mov dx,scrfln call poscur call clearl ; Clear to end of line. [19a] ret CLRFLN ENDP ; some random screen positioning functions kbpos: mov dx,scrkb ; KBytes transferred. jmp poscur perpos: mov dx,scrper ; Percent transferred. call poscur jmp clearl frpos: mov dx,scrfr ; Say renamed file. call poscur jmp clearl stpos: mov dx,scrst ; Print status of file transfer. call poscur jmp clearl nppos: mov dx,scrnp ; Number of packets sent. jmp poscur rprpos: mov dx,scrrpr ; Reprompt position. jmp poscur nrtpos: mov dx,scrnrt ; Number of retries. jmp poscur sppos: mov dx,scrsp ; Send packet location. jmp poscur rppos: mov dx,scrrp ; Receive packet location. jmp poscur ; Initialize buffers and clear line. INIT PROC NEAR call cmblnk call locate mov ah,prstr ; Put statistics headers on the screen. mov dx,offset outlin int dos mov dx,offset cxzhlp call putmod ; write mode line mov wrpmsg,0 ; haven't printed the messsage yet. call init1 ret INIT ENDP INIT1 PROC NEAR mov chrcnt,dmasiz ; Number of chars left. mov bufpnt,offset buff ; Addr for beginning. mov hierr,0 ret INIT1 ENDP ; Output the chars in a packet. ; Called with AX = size of the data, BX = address of source. FILEIO PROC NEAR ptchr: mov cx,ax lea ax,outbuf ; Where to put data when buffer gets full. jmp decode ; CX = Size of data, BX = Address of data, AX = Routine to call to ; dump data. decode: push si push di push es push dx push ax mov ax,ds mov es,ax pop ax mov si,bx ; Source of data. mov bx,ax ; Coroutine to call. mov di,bufpnt ; Destination of data. mov dh,0 ; assume no quote char cmp trans.ebquot,'N' ; no quoting? je decod1 ; yes, keep going cmp trans.ebquot,'Y' ; or not doing it? je decod1 ; yes, keep going mov dh,trans.ebquot ; otherwise use quote char decod1: mov rptct,0 ; Reset. mov rptval,0 ; Ditto. dec cx jge dcod11 ; More data. jmp decod6 ; Else, we're through. dcod11: dec chrcnt ; Decrement number of chars in dta. jns decod2 ; Continue if space left. push cx push dx push bx call bx ; Output it if full. jmp decod5 ; Error return if disk is full. nop pop bx pop dx pop cx mov di,bufpnt decod2: cmp rptct,0 ; Doing a repeat? je dcod20 ; No, so go get a character. mov ah,0 mov al,rptval ; Get the character we're repeating. jmp decod4 ; And write it out to the file. dcod20: lodsb ; Pick up a char. cmp rptq,0 ; Doing repeat quoting? je dcod21 ; Nope, skip this part. cmp al,rptq ; Did we pick up the repeat quote char? jne dcod21 ; No, continue processing it. lodsb ; Get the size. dec cx ; Modify buffer count. sub al,20H ; Was made printable. mov rptct,al ; Remember how many repetitions. lodsb ; Get the char to repeat. dec cx ; Modify buffer count. dcod21: mov ah,00H ; Assume no 8-bit quote char. [21b start] cmp al,dh ; This the 8-bit quot char? jne decod3 lodsb ; Get the real character. dec cx ; Decrement # chars in packet mov ah,80H ; Turn on 8-bit quot char flag. [21b end] decod3: cmp al,trans.squote ; Is it the quote char? [21b] [21c] jne decod4 ; If not proceed. lodsb ; Get the quoted character dec cx ; Decrement # of chars in packet. or ah,al ; save parity (combine with prefix) and ah,80h ; only parity and al,7FH ; Turn off the parity bit. cmp al,trans.squote ; Is it the quote char? [21c] je decod4 ; If so just go write it out. cmp al,dh ; This the 8-bit quot char? je decod4 ; If so, just go write it out cmp al,rptq ; Is is the repeat quote character? je decod4 ; If so, just write it out. add al,40H ; Make it a control char again. and al,7FH ; Modulo 128. decod4: or al,ah ; or in parity stosb ; store the character dec rptct ; Repeat counter. cmp rptct,0 ; Write out char again? jg dcod41 jmp decod1 ; No, get next char. dcod41: mov rptval,al ; Save the char. jmp dcod11 ; and loop to next char. decod5: pop bx pop dx ; dx is pushed twice (really) pop cx pop dx pop es pop di pop si ret decod6: mov bufpnt,di pop dx pop es pop di pop si jmp rskp ; Return successfully if done. ; output the buffer, reset bufpnt and chrcnt outbuf: cmp flags.xflg,1 ; Writing to screen? [21c] je outbf2 ; Yes, handle specially. [21c] push bx mov ah,writef ; The write code. mov dx,offset fcb int dos ; Write the record. pop bx cmp al,0 ; Successful. jz outbf1 push ax ; Remember the return code. [20d] call abfil ; Fix things up before aborting. [20d] pop ax ; Retrive return code. [20d] cmp al,01 jz outbf0 call erpos mov ah,prstr mov dx,offset erms17 ; Record length exceeds dta. int dos ret outbf0: call erpos mov ah,prstr ; Tell about it. mov dx,offset erms11 ; Disk full error. int dos ret outbf1: add tfilsz+2,80H ; Say 128 more characters received. adc tfilsz,0 call kbpr ; Print the kilobytes received. call perpr ; Print the percent ('?' for now). outb11: mov bufpnt,offset buff ; Addr for beginning. mov chrcnt,dmasiz-1 ; Buffer size. jmp rskp outbf2: mov cx,dmasiz-1 ; Number of chars to write. [21c] sub cx,chrcnt ; minus # of unused in buffer mov di,offset buff ; Where they are. [21c] call prtscr ; Output buffer to screen. [21c] jmp outb11 ; Reset counter & pointer. [21c] ; Tidy up before aborting. [20d] ABFIL PROC NEAR mov ah,closf ; Close the file. mov dx,offset fcb int dos cmp flags.abfflg,1 ; Delete what got across or keep it? jne abfil0 ; Nope, keep it. mov ah,delf ; Delete it. mov dx,offset fcb int dos abfil0: mov bx,offset erms10 ; Text of message to send. call errpack ; Send an error packet. ret ABFIL ENDP ; General routine for sending an error packet. Register BX should ; point to the text of the message being sent in the packet. [20f] ERRPACK PROC NEAR mov di,offset data ; Where to put the message. mov al,0 errp1: mov ah,[bx] cmp ah,'$' ; At end of message? je errp2 inc al ; Remember number of chars in msg. mov [di],ah inc bx inc di jmp errp1 errp2: mov ah,0 mov pack.argbk1,ax mov ah,'E' ; And send an error packet. call spack ret ; Return if succeed or fail. nop nop ret ERRPACK ENDP ; Get the chars from the file. gtchr: cmp flags.filflg,0 ; Is there anything in the DMA? jz gtchr0 ; Yup, proceed. mov ah,rptq mov origr,ah ; Save repeat prefix here. mov rptct,1 ; Number of times char is repeated. mov rptval,0 ; Value of repeated char. call inbuf jmp gtchr1 ; No more chars, go return EOF. nop ; Make three bytes long. gtchr0: lea bx,inbuf jmp encode gtchr1: mov ax,0ffffh ret ; encode - writes data portion of kermit packet into filbuf. ; expects BX to contain the address of a routine to refill the buffer, ; chrcnt to be the # of chars in the buffer, trans.maxdat to contain ; the maximum size of the data packet, bufpnt to contain a pointer to ; the source of the characters. ; Returns: AX/ the number of characters actually written to the buffer. encode: mov cl,trans.maxdat ; Maximum packet size. [21b] mov ch,0 mov di,offset filbuf ; Where to put the data. mov si,bufpnt ; pointer into source buffer mov dl,trans.rquote ; send quote char mov dh,0 ; assume no 8-bit quoting cmp trans.ebquot,'N' ; not doing 8-bit quoting je encod1 cmp trans.ebquot,'Y' ; or can but won't? je encod1 mov dh,0ffh ; remember we have to do it encod1: dec cx ; Decrement output buffer counter. jge encod2 ; Go on if there is more than one left. sub di,offset filbuf mov ax,di mov bufpnt,si ; update pointer into DMA. jmp rskp encod2: dec chrcnt ; any data in buffer? jge encod3 ; yes, skip over buffer refill. call bx ; Get another buffer full. jmp encod8 mov si,bufpnt ; update position in DMA. cmp chrcnt,0 ; no characters returned? jne encod3 ; Got some, keep going. jmp encod8 ; none, assume eof. encod3: lodsb cmp rptq,0 ; Are we doing repeat prefixing? je encd3x ; Nope, skip next part. cmp chrcnt,0 ; Are we on the last character? jle encd31 ; Yes, so there's no next character. cmp rptct,94 ; Max number that we can put in a byte. je encd31 ; Then that's it. mov ah,[si] ; Get the next character. cmp al,ah ; Is current char == next char? jne encd31 inc rptct ; Number of times char appears. mov rptval,al ; Remember the character. inc cx ; Repeats don't take up so much buffer space. jmp encod1 ; Keep checking for more. encd31: cmp rptct,1 ; Were previous characters repeats? je encd3x ; No, so just add this char. cmp rptct,rptmin ; Are we within bounds for repeat prefixing? jge encd32 ; Yes, use repeat prefixing. mov al,rptct mov ah,0 sub si,ax ; Not enough characters to warrant it. mov rptval,0 ; Clear out this value. inc cx ; Adjust output buffer pointer. mov al,rptq mov origr,al ; Save original repeat prefix. mov rptq,0 ; Pretend we're not doing the prefixing. mov al,rptct mov ah,0 add chrcnt,ax ; Adjust input buffer pointer. jmp encod1 ; Reprocess those characters. encd32: push ax ; Do repeat prefixing - save data. mov al,rptq ; Add repeat prefix char. stosb dec cx ; Account for it in buffer size. mov al,rptct ; Get the repeat count. add al,20H ; Make it printable. stosb ; Add to buffer. dec cx pop ax ; Get back the actual character. mov rptct,1 ; Reset repeat count. mov rptval,0 ; And this. encd3x: cmp dh,0 ; are we doing 8-bit quoting? je encod4 ; no, forget this. test al,80h ; parity on? je encod4 ; no, don't bother with this and al,7fh ; turn off parity push ax ; save original char for a bit dec cx ; decrement # of chars left mov al,trans.ebquot ; get quote char stosb ; save in buffer pop ax ; restore character encod4: mov ah,al ; save character and ah,80h ; only parity and al,7fh ; turn off parity in character cmp al,' ' ; Compare to a space. jl encod5 ; If less then its a control char. cmp al,del ; Is the char a delete? jz encod5 ; Go quote it. cmp al,dl ; Is it the quote char? je encod6 ; Yes - go add it. [21b start] cmp dh,0 ; are we doing 8-bit quoting? je encd41 ; no, don't translate it cmp al,trans.ebquot ; Is it the 8-bit quote char? je encod6 ; Yes, just output with quote encd41: cmp origr,0 ; Doing repeat prefixing? je encod7 ; No, don't check for quote char. cmp al,origr ; Is this the repeat quote character. je encod6 ; Yes, then quote it. jmp short encod7 ; else don't quote it. encod5: add al,40h ; control char, uncontrollify and al,7fh encod6: push ax ; save the char dec cx mov al,dl stosb pop ax encod7: or al,ah ; put parity back stosb cmp rptct,1 ; One occurence of this char? jne encd7x mov al,origr mov rptq,al ; Restore repeat quote char. jmp encod1 ; Yes, so loop around for some more. encd7x: dec rptct ; Add another entry of this char. jmp encod1 ; With quoting and all. encod8: sub di,offset filbuf or di,di je encod9 ; Nope. mov ax,di jmp rskp encod9: mov ax,0FFFFH ; Get a minus one. ret inbuf: mov ah,flags.eoflag ; Have we reached the end? cmp ah,0 jz inbuf0 ret ; Return if set. inbuf0: push si push di push dx push bx push cx mov bx,offset buff ; Set the r/w buffer pointer. mov bufpnt,bx mov ah,readf ; Read a record. mov dx,offset fcb int dos mov cx,filsiz cmp cx,0 ; Check for 128 chars or less left. jne inbuf1 ; Still have data left. mov ax,ds mov es,ax mov si,offset filsiz+2 mov di,offset bufhex cmps filsiz+2,es:bufhex ja inbuf1 ; More than 128 chars. mov flags.eoflag,0FFH ; Set End-of-file. mov cx,filsiz+2 cmp flags.filflg,0 ; Ever used DMA? [25] jnz inbf01 dec cx ; Account for DEC in caller routine. inbf01: mov chrcnt,cx ; Return proper number of chars. mov flags.filflg,0 ; Buffer not empty. pop cx pop bx pop dx pop di pop si jmp rskp inbuf1: sub filsiz+2,80H ; Sent another 128 chars. sbb filsiz,0 ; Account for the doubleword. add tfilsz+2,80H ; Book keeping for the same. adc tfilsz,0 push ax call kbpr ; Print the kilobytes sent. call perpr ; Print the percent sent. pop ax mov al,80H ; Use as counter for number of chars read. pop cx pop bx pop dx pop di pop si cmp flags.filflg,0 ; Ever used DMA? jnz inbf21 ; Nope, then don't change count. dec al ; Fix boundary error. inbf21: mov ah,0 ; Zero the flag (buffer not empty). mov chrcnt,ax ; Number of chars read from file. mov flags.filflg,0 ; Buffer not empty. jmp rskp nulref: mov chrcnt,0 ; No data to return. jmp rskp nulr: ret ; Print the number of Kilobytes transferred. kbpr: cmp flags.remflg,0 ; remote mode? jne kbpr1 ; yes, no printing. mov ax,tfilsz+2 mov bx,tfilsz mov cl,10 shr ax,cl ; divide by 1024 mov cl,6 ; high order moves 16-10 = 6 bits shl bx,cl or ax,bx cmp ax,oldkbt ; is it the same? je kbpr1 ; yes, skip printing mov oldkbt,ax ; save new # of kb push ax call kbpos ; Postion the cursor. pop ax call nout ; Print the number of KBytes transferred. kbpr1: ret ; Print the percent transferred. perpr: cmp flags.remflg,0 ; remote mode? jne perpr5 ; yes, no printing. mov ax,tfilsz or ax,tfilsz+2 cmp ax,oldper ; same as it was before? je perpr5 ; yes, don't bother printing. mov oldper,ax ; remember this for next time cmp ofilsz,0 ; No divide by zeroes. je perpr5 ; If not proceed. cmp wrpmsg,0 ; did we write the percentage message? jne perpr1 ; yes, skip this part call perpos ; position cursor mov dx,offset permsg mov ah,prstr int dos ; write out message mov wrpmsg,1 ; init flag so we don't do it again perpr1: call perpos ; Position the cursor. perpr2: mov dx,tfilsz ; Get the high order word. mov ax,tfilsz+2 ; Get the low order word. div ofilsz ; Div by percent adjusted original file size. cmp ax,100 ; > 100% ? jle perpr3 ; no, accept it mov ax,100 ; else just use 100 perpr3: call nout mov dl,'%' ; Load a percent sign. perpr4: mov ah,conout ; Print the character. int dos perpr5: ret getfil: mov ah,0FFH mov flags.filflg,ah ; Nothing in the DMA. mov ax,0 mov flags.eoflag,ah ; Not the end of file. mov bx,offset fcb+0CH mov [bx],ax ; Zero the current block number. mov bx,offset fcb+0EH mov [bx],ax ; Ditto for Lrecl. mov bx,offset fcb+20H mov [bx],ah ; Zero the current record (of block). inc bx mov [bx],ax ; Same for record (of file). mov bx,offset fcb+23H mov [bx],ax mov ah,openf ; Open the file. mov dx,offset fcb int dos mov dx,word ptr fcb+18 ; get file size (hi order word) mov filsiz,dx mov ax,word ptr fcb+16 ; lo order word mov filsiz+2,ax div percnt ; Divide by 100. mov ofilsz,ax mov tfilsz,0 ; Set bytes sent to zero. mov tfilsz+2,0 mov oldkbt,-1 mov oldper,-1 cmp filsiz,0 ; Null file? jne getfl0 ; Nope. cmp filsiz+2,0 ; Null file? jne getfl0 ; Nope. mov flags.eoflag,0FFH ; Set EOF. getfl0: jmp rskp gtnfil: cmp flags.cxzflg,'Z' ; Did we have a ^Z? [20b] je gtn5 ; If yes, we're done sending files. [20b] cmp flags.wldflg,0 ; Was there a "*"? [7 start] je gtn5 ; Nope. mov bx,offset cpfcb ; Get FCB from last check for file. mov di,offset fcb ; Copy to FCB. mov cl,37 ; Size of FCB. call fcbcpy gtn2: mov ah,snext mov dx,offset fcb ; More files? int dos cmp al,0FFH je gtn5 mov bx,offset fcb mov di,offset cpfcb mov cl,37 call fcbcpy ; Copy from FCB. mov di,offset fcb+1 ; Get name of next file to send. mov bx,offset buff+1 mov cl,11 call fcbcpy call getfil ; Initialize jmp r jmp rskp gtn5: mov flags.wldflg,0 ; Reset wild card flag. ret ; [7 end] ; Get the file name (including host to micro translation) gofil: cmp flags.xflg,1 ; Remote command? [21c] jne goflx ; No.... [21c] jmp gofla ; Yes so skip this stuff. [21c] goflx: cmp flags.nmoflg,1 ; Overriding name from other side? [21a] jne gofil0 ; No - get the filename. [21a] jmp gofil7 ; Yes, so ignore packet contents. [21a] gofil0: mov bx,offset data ; Get the address of the file name. [21a] mov fdtpnt,bx ; Store the address. mov bx,offset fcb+1 ; Address of the FCB. mov fcbptr,bx ; Save it. mov ax,0 mov temp1,ax ; Initialize the char count. mov temp2,ax cmp flags.droflg,1 ; Default drive? [21a] je gofil1 ; No - don't blank out value in FCB. [21a] mov si,offset fcb mov [si],ah ; Set the drive to default to current. gofil1: mov ch,' ' ; Moved the label. [21a] mov [bx],ch ; Blank the FCB. inc bx inc ah cmp ah,0BH ; Twelve? jl gofil1 gofil2: mov bx,fdtpnt ; Get the NAME field. mov ah,[bx] inc bx mov fdtpnt,bx cmp ah,'.' ; Seperator? jne gofil3 mov bx,offset fcb+9H mov fcbptr,bx mov ax,temp1 mov temp2,ax mov temp1,9H jmp gofil6 gofil3: cmp ah,0 ; Trailing null? jz gofil7 ; Then we're done. call verlet ; Verify that the char is legal. mov bx,fcbptr mov [bx],ah inc bx mov fcbptr,bx mov ax,temp1 ; Get the char count. inc ax mov temp1,ax cmp ax,8H ; Are we finished with this field? jl gofil2 gofil4: mov temp2,ax mov bx,fdtpnt mov ah,[bx] inc bx mov fdtpnt,bx cmp ah,0 jz gofil7 cmp ah,'.' ; Is this the terminator? jne gofil4 ; Go until we find it. gofil6: mov bx,fdtpnt ; Get the TYPE field. mov ah,[bx] inc bx mov fdtpnt,bx cmp ah,0 ; Trailing null? jz gofil7 ; Then we're done. call verlet ; Verify that the char is legal. mov bx,fcbptr mov [bx],ah inc bx mov fcbptr,bx inc temp1 ; Increment char count. cmp temp1,0CH ; Are we finished with this field? jl gofil6 gofil7: cmp flags.remflg,0 ; remote mode? jne gofil7a ; yes, don't print it. call prtfn ; Print the file name. [21a] gofil7a:cmp flags.destflg,0 ; Writing to the printer? jne gf7y push es mov ax,ds mov es,ax ; Set this up. mov cx,11 mov si,offset printer mov di,offset fcb repne movsb ; Change name in FCB to be printer. pop es jmp gofil9 gf7y: mov ah,flags.flwflg ; Is file warning on? cmp ah,0 jnz gf7x jmp gofil9 ; If not, just proceed. gf7x: mov ah,openf ; See if the file exists. mov dx,offset fcb int dos cmp al,0FFH ; Does it exist? jnz gf8x jmp gofil9 ; If not create it. gf8x: cmp flags.remflg,0 ; remote mode? jne gf8xa ; yes, skip printing call frpos ; Position cursor. mov ah,prstr ; Inform the user we are renaming the file. mov dx,offset infms5 int dos gf8xa: mov ax,temp2 ; Get the number of chars in the file name. cmp ax,0 jne gofil8 mov ax,temp1 mov temp2,ax gofil8: mov ch,0 mov cl,al mov al,0 ; Says if first field is full. cmp cl,9H ; Is the first field full? jne gofl81 mov al,0FFH ; Set a flag saying so. dec cl gofl81: mov bx,offset fcb ; Get the FCB. add bx,cx ; Add in the character number. mov ah,'&' mov [bx],ah ; Replace the char with an ampersand. push ax push bx mov ah,openf ; See if the file exists. mov dx,offset fcb int dos pop bx cmp al,0FFH ; Does it exist? pop ax jz gofl89 ; If not create it. cmp al,0 ; Get the flag. jz gofl83 dec cl ; Decrement the number of chars. cmp cl,0 jz gofl88 ; If no more, die. jmp gofl81 gofl83: inc cl ; Increment the number of chars. cmp cl,9H ; Are we to the end? jl gofl81 ; If not try again ; else fail. gofl88: cmp flags.remflg,0 ; remote mode? jne gofl88a ; yes, no printing call erpos ; Position cursor. mov ah,prstr ; Tell the user that we can't rename it. mov dx,offset ermes4 int dos gofl88a:mov bx,dx ; Tell host can't rename. [20f] call errpack ; Send error packet before abort. [20f] ret gofl89: cmp flags.remflg,0 ; remote mode jne gofil9 ; yes, don't have to print it mov bx,offset fcb+0CH ; Point past the end of the file name. mov dh,[bx] ; Save the present contents. mov ah,'$' mov [bx],ah ; Put in a dollar sign. push dx mov ah,prstr ; Print the file name. mov dx,offset fcb+1 int dos pop dx mov bx,offset fcb+0CH ; Restore over the dollar sign. mov [bx],dh gofil9: mov ah,delf ; Delete the file if it exists. mov dx,offset fcb int dos mov ax,0 mov si,offset fcb+0CH mov [si],ax ; Zero current block. mov si,offset fcb+0EH mov [si],ax ; Same for Lrecl. mov si,offset fcb+20H mov [si],ah ; Zero the current record (within block). inc si mov [si],ax ; Zero record (within file). mov si,offset fcb+23H mov [si],ax mov ofilsz,0 ; File size unknown. mov tfilsz,0 ; Set bytes received to zero. mov tfilsz+2,0 mov oldkbt,-1 mov oldper,-1 mov ah,makef ; Now create it. mov dx,offset fcb int dos cmp al,0FFH ; Is the disk full? je gf9x jmp rskp gf9x: cmp flags.remflg,0 ; remote mode? jne gf9xa ; yes, don't try printing call erpos ; Position cursor. mov ah,prstr ; If so tell the user. mov dx,offset erms12 int dos mov bx,dx gf9xa: call errpack ; Send an error packet. ret gofla: cmp pack.argbk1,0 ; Any data in "X" packet? [21c start] je gofla1 ; Nothing to print. mov ah,prstr mov dx,offset crlf int dos mov di,offset data ; Where data is. mov cx,pack.argbk1 ; How much data we have. call prtscr ; Print it on the screen. gofla1: mov ah,prstr mov dx,offset crlf int dos jmp rskp ; And done. [21c end] FILEIO ENDP ; Passed char of incoming filename in AH. Verify that it is legal ; and if not change it to an "X". verlet: cmp ah,'0' jl ver2 ; See if it's a legal weird char. cmp ah,'z'+1 jns ver2 cmp ah,'9' jle ver1 ; It's between 0-9 so it's OK. cmp ah,'A' jl ver2 ; Coud be a weird char. cmp ah,'Z' jle ver1 ; It's A-Z so it's OK. cmp ah,'a' jl ver2 and ah,137O ; It's a-z, capitalize. ver1: ret ver2: push es mov cx,ds mov es,cx ; Scan uses ES register. mov di,offset spchar ; Special chars. mov cx,spclen ; How many of them. cmp dosnum,0 ; Under version 2.0 je ver3 mov di,offset spchar2 mov cx,spc2len ver3: mov al,ah ; Char is in al. repnz scasb ; Search string for input char. pop es mov ah,al ; Return it in AH. cmp cx,0 ; Was it there? jnz ver1 ; Yes, return it. mov ah,'X' ; If illegal, replace with "X". mov flags.nmoflg,1 ret ; Print incoming filename(s). [21a] PRTFN PROC NEAR call clrfln ; Position cursor & blank out the line. mov di,offset data ; Where to put the name. mov bx,offset fcb ; Where it is now. cmp flags.droflg,0 ; Drive specified? je prtfn1 mov dl,[bx] ; Which one did they say? add dl,'@' ; Make it readable. mov ah,dconio ; Print the drive name. int dos mov dl,':' int dos prtfn1: inc bx ; Point to start of filename. cmp flags.nmoflg,0 ; Is filename in packet? je prtfn2 ; no, keep going add di,pack.argbk1 ; bump by length of remote name mov si,offset asmsg ; something to put after it mov cx,asmln ; length of it rep movsb ; add this to the buffer prtfn2: mov cx,8 ; At most 8 letters in file name. mov si,bx ; this is source now prtfn3: lodsb ; get a letter cmp al,' ' ; Done with name? je prtfn4 ; yes, continue stosb ; else store loop prtfn3 ; and loop thru rest prtfn4: mov si,offset fcb+9 ; Point to file type. cmp byte ptr [si],' ' ; is there a type? je prtfn5 ; Nope so we're done. mov al,'.' ; Add the dot. stosb mov cx,3 ; At most 3 letters in file type. rep movsb ; copy type (incl trailing spaces) prtfn5: mov byte ptr [di],'$' ; end the string mov ah,prstr ; Print the file name. mov dx,offset data int dos mov flags.droflg,0 ; Reset flag once have the full name. mov flags.nmoflg,0 ret PRTFN ENDP ; Print data onto the screen. If text has no "$" in it, just print ; it. Else, do special output for the "$". ; Routine expects: DI = Start of buffer we are to print. ; CX = Number of characters to print. [21c] PRTSCR PROC NEAR mov al,'$' ; This is what we're looking for. mov oloc,di ; Remember original buffer address. mov osiz,cx ; And original size. push es mov bx,ds mov es,bx ; Have ES point to data area. prts0: repnz scasb ; Search for "$" in the buffer. cmp cx,0 ; Found one? je prts1 ; No, do a regular DOS call. mov ah,prstr mov dx,oloc ; Print up to the "$". int dos mov ah,dconio mov dl,'$' int dos ; Print the "$" mov oloc,di ; New starting location. mov osiz,cx ; New size. jmp prts0 prts1: mov bx,oloc ; The buffer location. add bx,osiz ; Point past the data. mov [bx],al ; Add "$" for printing. mov ah,prstr mov dx,oloc int dos pop es ret PRTSCR ENDP FIXFCB PROC NEAR push ax ; Don't forget this. [22] mov bx,offset fcb+18 mov di,offset filsiz mov ax,[bx] mov [di],ax mov bx,offset fcb+16 mov ax,[bx] mov 2[di],ax pop ax ; Get number of chars in last buffer full. [22] sub filsiz+2,ax ; Get real file size. sbb filsiz,0 mov bx,offset fcb+18 mov di,offset filsiz mov ax,[di] mov [bx],ax mov bx,offset fcb+16 mov ax,2[di] mov [bx],ax ret FIXFCB ENDP ; Jumping to this location is like retskp. It assumes the instruction ; after the call is a jmp addr. RSKP PROC NEAR pop bp add bp,3 push bp ret RSKP ENDP ; Jumping here is the same as a ret. R PROC NEAR ret R ENDP code ends end //go.sysin dd * made=TRUE if [ $made = TRUE ]; then /bin/chmod 640 msfile.asm /bin/echo -n ' '; /bin/ls -ld msfile.asm fi