ProfitPress Mega CDROM2 Shareware Freeware (MSDOS)(1992)(Eng)

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Assembly Source File | 1991-05-07 | 32.3 KB | 852 lines

;--------------------------------------------------------------------------; ; Program: Ask .Asm ; ; Purpose: Ask question in batch file and time out if desired. ; ; Notes: Compiles under TURBO Assembler, v2.0. Should work on any ; ; machine running MS-DOS, v2.xx or higher. ; ; Status: Released into the public domain. Enjoy! If you use it, ; ; let me know what you think. You don't have to send ; ; any money, just comments and suggestions. ; ; Updates: 23-Apr-90, v1.0, GAT ; ; - initial version. ; ; 13-May-90, GAT ; ; - fixed problem with return code if time-out reached. ; ; 08-Jul-90, GAT ; ; - added macros to push/pop registers. ; ; 28-Aug-90, v1.1a, GAT ; ; - put equates and macros in separate files. ; ; - put common routines in libs. ; ;--------------------------------------------------------------------------; ;--------------------------------------------------------------------------; ; Author: George A. Theall ; ; Phone: +1 215 662 0558 ; ; SnailMail: TifaWARE ; ; 506 South 41st St., #3M ; ; Philadelphia, PA. 19104 USA ; ; E-Mail: GTHEALL@PENNDRLS.UPENN.EDU (Internet) ; ;--------------------------------------------------------------------------; ;--------------------------------------------------------------------------; ; D I R E C T I V E S ; ;--------------------------------------------------------------------------; DOSSEG MODEL tiny IDEAL LOCALS JUMPS ; ; This section comes from D:\ASM\INCLUDE\Equates.Inc. ; EOS EQU 0 ; terminates strings BELL EQU 7 BS EQU 8 TAB EQU 9 CR EQU 13 LF EQU 10 ESCAPE EQU 27 ; nb: ESC is a TASM keyword SPACE EQU ' ' KEY_F1 EQU 3bh KEY_F2 EQU 3ch KEY_F3 EQU 3dh KEY_F4 EQU 3eh KEY_F5 EQU 3fh KEY_F6 EQU 40h KEY_F7 EQU 41h KEY_F8 EQU 42h KEY_F9 EQU 43h KEY_F10 EQU 44h KEY_HOME EQU 47h KEY_UP EQU 48h KEY_PGUP EQU 49h KEY_LEFT EQU 4bh KEY_RIGHT EQU 4dh KEY_END EQU 4fh KEY_DOWN EQU 50h KEY_PGDN EQU 51h KEY_INS EQU 52h KEY_DEL EQU 53h KEY_C_F1 EQU 5eh KEY_C_F2 EQU 5fh KEY_C_F3 EQU 60h KEY_C_F4 EQU 61h KEY_C_F5 EQU 62h KEY_C_F6 EQU 63h KEY_C_F7 EQU 64h KEY_C_F8 EQU 65h KEY_C_F9 EQU 66h KEY_C_F10 EQU 67h KEY_C_LEFT EQU 73h KEY_C_RIGHT EQU 74h KEY_C_END EQU 75h KEY_C_PGDN EQU 76h KEY_C_HOME EQU 77h KEY_C_PGUP EQU 84h KEY_F11 EQU 85h KEY_F12 EQU 86h KEY_C_F11 EQU 89h KEY_C_F12 EQU 8ah DOS EQU 21h ; main MSDOS interrupt STDIN EQU 0 ; standard input STDOUT EQU 1 ; standard output STDERR EQU 2 ; error output STDAUX EQU 3 ; COM port STDPRN EQU 4 ; printer ; ; This section comes from D:\ASM\INCLUDE\Macros.Inc. ; MACRO Pop_M RegList ;; Pops registers off stack. IRP Reg, <RegList> IFIDNI <Reg>, <flags> popf ELSE pop Reg ENDIF ENDM ENDM MACRO Push_M RegList ;; Pushes registers onto stack. IRP Reg, <RegList> IFIDNI <Reg>, <flags> pushf ELSE push Reg ENDIF ENDM ENDM MACRO Zero Reg ;; Zeros any register. xor Reg, Reg ENDM ERRH equ 255 ; errorlevel if help given ;--------------------------------------------------------------------------; ; C O D E S E G M E N T ; ;--------------------------------------------------------------------------; CODESEG ORG 80h ; commandline LABEL CmdLen BYTE db ? LABEL CmdLine BYTE db 127 dup (?) ORG 100h ; start of .COM file STARTUPCODE jmp main ; skip over data and stack ;--------------------------------------------------------------------------; ; D A T A ; ;--------------------------------------------------------------------------; LABEL ProgName BYTE db 'ask: ', EOS LABEL EOL BYTE db '.', CR, LF, EOS LABEL HelpMsg BYTE db CR, LF db 'TifaWARE ASK, v1.1a, ', ??Date db ' - ask questions in batch files.', CR, LF db 'Usage: ask [-options] [msgtxt]', CR, LF, LF db 'Options:', CR, LF db ' -l = convert response to lower case', CR, LF db ' -tn = wait n seconds before timing out', CR, LF db ' -u = convert response to upper case', CR, LF db ' -? = display this help message', CR, LF, LF db 'msgtxt is an optional message to display.', CR, LF, EOS LABEL Err1Msg BYTE db 'illegal option -- ' LABEL OptCh BYTE db ? db EOS LABEL Err2Msg BYTE db 'time-out value not specified', EOS LABEL Err3Msg BYTE db 'time-out value too large -- ', EOS SwitCh db '-' ; char introducing options HFlag db 0 ; flag for on-line help LFlag db 0 ; flag for lowercase response TFlag db 0 ; flag for time-out UFlag db 0 ; flag for uppercase response Delay dw ? ; time to pause for key MsgLen db 0 ; length of message text MsgTxt dw ? ; near pointer to message text RCode db 0 ; program return code ;--------------------------------------------------------------------------; ; L O C A L S T A C K ; ;--------------------------------------------------------------------------; db 16 dup ("STACK ") ; 128 bytes for local stack StackTop = $ ;--------------------------------------------------------------------------; ; P R O C E D U R E S ; ;--------------------------------------------------------------------------; ;---- skip_Spaces -------------------------------------------------------; ; Purpose: Skips past spaces in a string. ; ; Notes: Scanning stops with either a non-space *OR* CX = 0. ; ; Entry: DS:SI = start of string to scan. ; ; Exit: AL = next non-space character, ; ; CX is adjusted as necessary, ; ; DS:SI = pointer to next non-space. ; ; Calls: none ; ; Changes: AL, CX, SI ; ;--------------------------------------------------------------------------; PROC skip_Spaces jcxz SHORT @@Fin @@NextCh: lodsb cmp al, ' ' loopz @@NextCh jz SHORT @@Fin ; CX = 0; don't adjust inc cx ; adjust counters if cx > 0 dec si @@Fin: ret ENDP skip_Spaces ;---- get_Opt -----------------------------------------------------------; ; Purpose: Get a commandline option. ; ; Notes: none ; ; Entry: AL = option character, ; ; CX = count of characters left in commandline, ; ; DS:SI = pointer to first option to process. ; ; Exit: CX = count of characters left _after_ processing, ; ; DS:SI = pointer to whitespace _after_ options, ; ; Calls: tolower, errmsg, isdigit, atou, fputs ; ; Changes: AX, BL, CX, DX, SI, ; ; [OptCh], [HFlag], [LFlag], [TFlag], [UFlag], [Delay] ; ;--------------------------------------------------------------------------; PROC get_Opt mov [OptCh], al ; save for later call tolower ; use only lowercase in cmp. cmp al, 'l' jz SHORT @@OptL cmp al, 't' jz SHORT @@OptT cmp al, 'u' jz SHORT @@OptU cmp al, '?' jz SHORT @@OptH mov dx, OFFSET Err1Msg ; unrecognized option call errmsg ; then *** DROP THRU *** to OptH ; ; Various possible options. ; @@OptH: mov [HFlag], 1 ; set help flag jmp SHORT @@Fin @@OptL: mov [LFlag], 1 ; set lowercase flag jmp SHORT @@Fin @@OptT: mov [TFlag], 1 ; set time-out flag mov al, [BYTE PTR si] ; get next character call isdigit ; if not a digit, trouble! jz SHORT @@GetDelay mov dx, OFFSET Err2Msg ; no delay specified call errmsg jmp @@OptH @@GetDelay: mov dx, si ; save to adjust CX and if error call atou pushf ; preserve flags add cx, dx ; adjust counter sub cx, si popf ; restore flags jc SHORT @@BadDelay ; error in conversion? cmp ax, 60*60*12 ; 12 or more hours? jae SHORT @@BadDelay ; yes, bad delay mov [Delay], ax jmp SHORT @@Fin @@BadDelay: push dx mov bx, STDERR mov dx, OFFSET ProgName call fputs mov dx, OFFSET Err3Msg call fputs pop dx mov al, [si] ; save next non-digit mov [BYTE PTR si], EOS ; replace with EOS call fputs mov [si], al ; restore it mov dx, OFFSET EOL call fputs jmp SHORT @@OptH @@OptU: mov [UFlag], 1 ; set uppercase flag @@Fin: ret ENDP get_Opt ;---- get_Arg -----------------------------------------------------------; ; Purpose: Gets a non-option from the set of commandline arguments. ; ; Notes: Anything left on the commandline is user's message text. ; ; Entry: CX = count of characters left in commandline, ; ; DS:SI = pointer to argument to process. ; ; Exit: CX = zero ; ; DS:SI = points to CR after commandline. ; ; Calls: none ; ; Changes: CX, SI ; ; [MsgLen], [MsgTxt] ; ;--------------------------------------------------------------------------; PROC get_Arg mov [MsgLen], cl ; for safekeeping mov [MsgTxt], si add si, cx ; adjust so nothing's left Zero cl mov [BYTE PTR si], EOS ; finish off string ret ENDP get_Arg ;---- process_CmdLine ---------------------------------------------------; ; Purpose: Processes commandline arguments. ; ; Notes: A switch character by itself is ignored. ; ; No arguments whatsoever causes help flag to be set. ; ; Entry: n/a ; ; Exit: n/a ; ; Calls: skip_Spaces, get_Opt, get_Arg ; ; Changes: AX, CX, SI, ; ; BL, DX (get_Opt), ; ; [HFlag], ; ; [OptCh], [LFlag], [TFlag], [UFlag], [Delay] (get_Opt), ; ; [MsgLen], [MsgTxt] (get_Arg), ; ; Direction flag is cleared. ; ;--------------------------------------------------------------------------; PROC process_CmdLine cld ; forward, march! Zero ch, ch mov cl, [CmdLen] ; length of commandline mov si, OFFSET CmdLine ; offset to start of commandline call skip_Spaces ; check if any args supplied or cl, cl jnz SHORT @@ArgLoop mov [HFlag], 1 ; if none, set help flag jmp SHORT @@Fin ; ; For each blank-delineated argument on the commandline... ; @@ArgLoop: lodsb ; next character dec cl cmp al, [SwitCh] ; is it the switch character? jnz SHORT @@NonOpt ; no ; ; Isolate each option and process it. Stop when a space is reached. ; @@OptLoop: jcxz SHORT @@Fin ; abort if nothing left lodsb dec cl cmp al, ' ' jz SHORT @@NextArg ; abort when space reached call get_Opt jmp @@OptLoop ; ; Process the current argument, which is *not* an option. ; Then, *drop thru* to advance to next argument. ; @@NonOpt: dec si ; back up one character inc cl call get_Arg ; ; Skip over spaces until next argument is reached. ; @@NextArg: call skip_Spaces or cl, cl jnz @@ArgLoop @@Fin: ret ENDP process_CmdLine ;--------------------------------------------------------------------------; ; E N T R Y P O I N T ; ;--------------------------------------------------------------------------; ;---- main --------------------------------------------------------------; ; Purpose: Main section of program. ; ; Notes: none ; ; Entry: Arguments as desired ; ; Exit: Return code as follows: ; ; 0 => program timed-out ; ; 255 => on-line help requested ; ; else => ASCII value of character pressed. ; ; Calls: process_CmdLine, fputs, pause, getchar, tolower, toupper ; ; Changes: n/a ; ;--------------------------------------------------------------------------; main: mov sp, OFFSET StackTop ; set up local stack ; ; Process commandline arguments. If the variable HFlag is set, then ; on-line help is displayed and the program immediately terminates. ; call process_CmdLine ; process commandline args cmp [HFlag], 0 ; is help needed? jz SHORT @@NoHelp ; no mov al, ERRH ; yes, so set return code mov bx, STDERR mov dx, OFFSET HelpMsg ; point to help message call fputs jmp SHORT @@Fin ; and jump to end of program ; ; Display any message from commandline then get keypress from user. ; @@NoHelp: mov bx, STDOUT ; everything to stdout cmp [MsgLen], 0 ; anything to print out? jz SHORT @@NoPrompt ; nope mov dx, [MsgTxt] call fputs @@NoPrompt: cmp [TFlag], 0 ; need to wait? jz SHORT @@KeyIn ; no mov ax, [Delay] ; yes, so... call pause ; pause jz SHORT @@KeyIn ; zf means a key is ready Zero al ; set return code to zero jmp SHORT @@NewLine @@KeyIn: call getchar ; ; Convert character in AL as necessary. NB: if both '-l' and '-u' options ; are specified, the return value will be based on *uppercase* value. ; cmp [LFlag], 0 ; convert to lowercase? jz SHORT @@MaybeUpper ; no call tolower @@MaybeUpper: cmp [UFlag], 0 ; convert to uppercase? jz SHORT @@NewLine ; no call toupper ; ; Add a final newline to keep things neat. ; @@NewLine: mov dx, OFFSET EOL + 1 call fputs ; ; Ok, let's terminate the program. Return code is already in AL. ; @@Fin: mov ah, 4ch int DOS EVEN ;-------------------------------------------------------------------------; ; Purpose: Gets current system time, based on DOS's internal clock. ; Notes: none ; Requires: 8086-class CPU and DOS v1.0 or better. ; Entry: n/a ; Exit: CL = minutes (0 - 59) ; CH = hour (0 - 23) ; DL = hundredths of seconds (0 - 99) ; DH = seconds (0 - 59) ; Calls: none ; Changes: CX, DX ;-------------------------------------------------------------------------; PROC gettime push ax mov ah, 2ch ; MS-DOS get system time function int DOS pop ax ret ENDP gettime EVEN ;-------------------------------------------------------------------------; ; Purpose: Writes an ASCIIZ string to specified device. ; Notes: A zero-length string doesn't seem to cause problems when ; this output function is used. ; Requires: 8086-class CPU and DOS v2.0 or better. ; Entry: BX = device handle, ; DS:DX = pointer to string. ; Exit: Carry flag set if EOS wasn't found or handle is invalid. ; Calls: strlen ; Changes: none ;-------------------------------------------------------------------------; PROC fputs IF @DataSize EQ 0 Push_M <ax, cx, di> ELSE Push_M <ax, cx, di, es> mov ax, ds mov es, ax ENDIF mov di, dx call strlen ; set CX = length of string jc SHORT @@Fin ; abort if problem finding end mov ah, 40h ; MS-DOS raw output function int DOS @@Fin: IF @DataSize EQ 0 Pop_M <di, cx, ax> ELSE Pop_M <es, di, cx, ax> ENDIF ret ENDP fputs EVEN ;-------------------------------------------------------------------------; ; Purpose: Reads a character from STDIN. ; Notes: Character is echoed to display. ; Requires: 8086-class CPU and DOS v1.0 or better. ; Entry: n/a ; Exit: AL = character. ; Calls: none ; Changes: AX ;-------------------------------------------------------------------------; PROC getchar mov ah, 1 int DOS ret ENDP getchar EVEN ;-------------------------------------------------------------------------; ; Purpose: Writes an error message to stderr. ; Notes: none ; Requires: 8086-class CPU and DOS v2.0 or better. ; Entry: DS:DX = pointer to error message. ; Exit: n/a ; Calls: fputs ; Changes: none ;-------------------------------------------------------------------------; PROC errmsg Push_M <bx, dx> push dx ; save again calling parameters mov bx, STDERR mov dx, OFFSET ProgName ; display program name call fputs pop dx ; recover calling parameters call fputs ; display error message mov dx, OFFSET EOL call fputs Pop_M <dx, bx> ret ENDP errmsg EVEN ;-------------------------------------------------------------------------; ; Purpose: Checks if a character is ready for input from STDIN. ; Notes: none ; Requires: 8086-class CPU and DOS v1.0 or better. ; Entry: n/a ; Exit: zf = 1 if character available. ; Calls: none ; Changes: flags ;-------------------------------------------------------------------------; PROC kbhit push ax mov ah, 0bh int DOS cmp al, 0ffh ; AL = FFh if character ready pop ax ret ENDP kbhit EVEN ;-------------------------------------------------------------------------; ; Purpose: Pauses execution for a specified number of seconds or ; until a keypress is detected. ; Notes: Delay should be less than 12 hours (43200 seconds) to ; avoid checks on date rollover yet ensure we haven't ; paused too long. Delay is not checked however! ; This procedure works by adding the delay to the current ; time and waiting until then. If the system clock is ; adjusted in meantime, results are unpredictable. I ; tried looping and calling gettime(), but that was ; inaccurate due to roundoff of hundreths of secs. ; Requires: 8086-class CPU and DOS v2.0 or better. ; Entry: AX = delay time (in seconds). ; Exit: Zero flag set if input ready; cleared otherwise. ; Calls: gettime, kbhit ; Changes: flags ;-------------------------------------------------------------------------; PROC pause Push_M <ax, bx, cx, dx> Zero bx mov cx, 60 ; 60 secs/min and 60 mins/hour Zero dx div cx ; now ax = hours and minutes mov bh, dl ; and bh = seconds (dh == 0) Zero dx div cx ; now ax = hours, dx = minutes mov ah, al ; hours mov al, dl ; minutes ; ; At this point, AX:BX = amount of time to sleep (hh.mm.ss.hs). ; call gettime ; get current time add ax, cx ; compute alarm time add bx, dx cmp bh, 60 ; too many seconds? jb SHORT @@CheckMins ; nope sub bh, 60 ; yep, adjust inc al @@CheckMins: cmp al, 60 ; too many minutes? jb SHORT @@CheckHours ; nope sub al, 60 ; yep, adjust inc ah @@CheckHours: cmp ah, 24 ; too many hours? jb SHORT @@TimeLoop ; nope sub ah, 24 ; yep, adjust ; ; Here's the main loop. Check for both keypress and alarm time. ; NB: Because of overhead in the code it's possible to overshoot ; the alarm time by a few hundreths of a second so check for that. ; @@TimeLoop: call kbhit ; check for user input jz SHORT @@Fin ; and abort if present call gettime ; get current time sub cx, ax ; cx = current time - alarm time jz SHORT @@CheckSecs ; if zero, check seconds cmp ah, 12 ; adjust if alarm is a.m. ... jae SHORT @@TooFar? cmp ch, 0 ; and current time is p.m. ... jl SHORT @@TooFar? ; (signed comparison!!!) sub ch, 24 ; by subtracting 24 hours @@TooFar?: neg cx ; cx = alarm time - current time cmp cx, 12 * 256 ; more than 12 hours difference? ja SHORT @@Fin ; yep (unsigned comparison!!!) jmp @@TimeLoop ; nope (already checked if ==) @@CheckSecs: cmp dx, bx ; wait a few more seconds? jb @@TimeLoop ; yep or dl, 1 ; no, clear zf @@Fin: Pop_M <dx, cx, bx, ax> ret ENDP pause EVEN ;-------------------------------------------------------------------------; ; Purpose: Converts string of digits to an *unsigned* integer in ; range [0, 65535]. ; Notes: Conversion stops with first non-numeric character. ; Requires: 8086-class CPU. ; Entry: DS:SI = pointer to string of digits. ; Exit: AX = unsigned integer (garbage if cf = 1), ; DS:SI = pointer to first non-digit found, ; cf = 1 if number is too big. ; Calls: none ; Changes: AX, SI ; flags ;-------------------------------------------------------------------------; PROC atou Push_M <bx, cx, dx> ; DX destroyed by MUL below Zero ax ; AX = digit to convert Zero bx ; BX = integer word mov cx, 10 ; CX = conversion factor @@NextCh: mov bl, [si] ; get character cmp bl, '0' ; test if a digit jb SHORT @@Fin cmp bl, '9' ja SHORT @@Fin inc si ; bump up pointer mul cx ; multiply old result by 10 jc SHORT @@Overflow sub bl, '0' ; convert digit add ax, bx ; add current value jnc @@NextCh ; continue unless result too big @@Overflow: Zero cx ; denotes overflow jmp @@NextCh @@Fin: cmp cx, 10 ; cf = (cx != 10) Pop_M <dx, cx, bx> ret ENDP atou EVEN ;-------------------------------------------------------------------------; ; Purpose: Tests if character is a valid ASCII digit. ; Notes: none ; Requires: 8086-class CPU. ; Entry: AL = character to be tested. ; Exit: Zero flag set if true, cleared otherwise. ; Calls: none ; Changes: flags ;-------------------------------------------------------------------------; PROC isdigit cmp al, '0' ; if < '0' zf = 0 jb SHORT @@Fin cmp al, '9' ; if > '9' zf = 0 ja SHORT @@Fin cmp al, al ; set Z flag @@Fin: ret ENDP isdigit EVEN ;-------------------------------------------------------------------------; ; Purpose: Converts character to lowercase. ; Notes: none ; Requires: 8086-class CPU. ; Entry: AL = character to be converted. ; Exit: AL = converted character. ; Calls: none ; Changes: AL ; flags ;-------------------------------------------------------------------------; PROC tolower cmp al, 'A' ; if < 'A' then done jb SHORT @@Fin cmp al, 'Z' ; if > 'Z' then done ja SHORT @@Fin or al, 20h ; make it lowercase @@Fin: ret ENDP tolower EVEN ;-------------------------------------------------------------------------; ; Purpose: Converts character to uppercase. ; Notes: none ; Requires: 8086-class CPU. ; Entry: AL = character to be converted. ; Exit: AL = converted character. ; Calls: none ; Changes: AL ; flags ;-------------------------------------------------------------------------; PROC toupper cmp al, 'a' ; if < 'a' then done jb SHORT @@Fin cmp al, 'z' ; if > 'z' then done ja SHORT @@Fin and al, not 20h ; make it lowercase @@Fin: ret ENDP toupper EVEN ;-------------------------------------------------------------------------; ; Purpose: Calculates length of an ASCIIZ string. ; Notes: Terminal char is _not_ included in the count. ; Requires: 8086-class CPU. ; Entry: ES:DI = pointer to string. ; Exit: CX = length of string, ; cf = 0 and zf = 1 if EOS found, ; cf = 1 and zf = 0 if EOS not found within segment. ; Calls: none ; Changes: CX, ; flags ;-------------------------------------------------------------------------; PROC strlen Push_M <ax, di, flags> cld ; scan forward only mov al, EOS ; character to search for mov cx, di ; where are we now not cx ; what's left in segment - 1 push cx ; save char count repne scasb je SHORT @@Done scasb ; test final char dec cx ; avoids trouble with "not" below @@Done: pop ax ; get original count sub cx, ax ; subtract current count not cx ; and invert it popf ; restore df dec di cmp [BYTE PTR es:di], EOS je SHORT @@Fin ; cf = 0 if equal stc ; set cf => error @@Fin: Pop_M <di, ax> ret ENDP strlen END