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

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Assembly Source File | 1990-10-28 | 27.9 KB | 724 lines

;--------------------------------------------------------------------------; ; Program: DAT .Asm ; ; Purpose: Displays current date and time. ; ; 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: 06-Mar-90, v1.0, GAT ; ; - initial version. ; ; 13-Mar-90, v1.1, GAT ; ; - added n option to suppress final CR/LF sequence. ; ; 19-Mar-90, GAT ; ; - fixed up on-line help message. ; ; 22-Apr-90, v1.2, GAT ; ; - revised most procedures based on work with ASK. ; ; 05-May-90, GAT ; ; - fixed bug in handling of non-zero return codes. ; ; 12-Jun-90, GAT ; ; - fixed bug in conv_Int2Ascii wrt DI's final value. ; ; 08-Jul-90, GAT ; ; - added macros to push/pop registers. ; ; 28-Aug-90, v1.3a, GAT ; ; - put equates and macros in separate files. ; ; - put common routines in libs. ; ; - added equates for date/time separators. ; ;--------------------------------------------------------------------------; ;--------------------------------------------------------------------------; ; 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 1 ; errorlevel if help given DATE_SEP equ '/' ; date separator TIME_SEP equ ':' ; time separator ;--------------------------------------------------------------------------; ; 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 'dat: ', EOS LABEL EOL BYTE db '.', CR, LF, EOS LABEL HelpMsg BYTE db CR, LF db 'TifaWARE DAT, v1.3a, ', ??Date db ' - displays the current date and time.', CR, LF db 'Usage: dat [-options] [msg]', CR, LF, LF db 'Options:', CR, LF db ' -d = display date', CR, LF db ' -n = suppress final newline sequence', CR, LF db ' -t = display time', CR, LF db ' -? = display this help message', CR, LF, LF db 'msg is an optional message to display before ' db 'the date or time.', CR, LF, EOS LABEL Err1Msg BYTE db 'illegal option -- ' LABEL OptCh BYTE db ? db EOS LABEL TwoDigits BYTE ; space for two digits db 2 dup (?), EOS SwitCh db '-' ; char introducing options HFlag db 0 ; flag for on-line help DFlag db 0 ; flag for displaying date NFlag db 0 ; flag for suppressing CR/LF TFlag db 0 ; flag for displaying time 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 ; ;--------------------------------------------------------------------------; ;---- put_TwoDigits -----------------------------------------------------; ; Purpose: Displays a number between 0 and 99 on STDOUT with a leading ; ; 0 as necessary. ; ; Notes: No validity checks are done. ; ; Entry: AL = number to display. ; ; Exit: n/a ; ; Calls: utoa, putchar, fputs ; ; Changes: [TwoDigits] ; ;--------------------------------------------------------------------------; PROC put_TwoDigits Push_M <ax, bx, dx, di> Zero ah mov bx, STDOUT mov di, OFFSET TwoDigits call utoa ; treat it as unsigned int cmp al, 9 ; need a leading 0? ja SHORT @@WriteIt mov dl, '0' call putchar @@WriteIt: mov dx, di call fputs Pop_M <di, dx, bx, ax> ret ENDP put_TwoDigits ;---- 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, ; ; Exit: n/a ; ; Calls: tolower, errmsg ; ; Changes: AX, DX, ; ; [OptCh], [HFlag], [DFlag], [NFlag], [TFlag], ; ;--------------------------------------------------------------------------; PROC get_Opt mov [OptCh], al ; save for later call tolower ; use only lowercase in cmp. cmp al, 'd' jz SHORT @@OptD cmp al, 'n' jz SHORT @@OptN cmp al, 't' jz SHORT @@OptT 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 @@OptD: mov [DFlag], 1 ; display date jmp SHORT @@Fin @@OptN: mov [NFlag], 1 ; no final CR/LF jmp SHORT @@Fin @@OptT: mov [TFlag], 1 ; display time @@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, ; ; DX (get_Opt), ; ; [DFlag], [TFlag], ; ; [OptCh], [NFlag] (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 ; yep mov [DFlag], 1 ; nope, so display date ... mov [TFlag], 1 ; and time 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 ran successfully ; ; 1 => on-line help requested ; ; Calls: process_CmdLine, fputs, putchar, getdate, put_TwoDigits, ; ; gettime ; ; 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 [RCode], ERRH ; yes, so set return code mov bx, STDERR mov dx, OFFSET HelpMsg ; point to help message call fputs ; display it 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 @@Date? ; nope mov dx, [MsgTxt] ; display message text call fputs mov dl, ' ' ; and a space call putchar @@Date?: cmp [DFlag], 0 jz SHORT @@Time? call getdate mov al, dh ; dh = month call put_TwoDigits mov al, dl ; dl = day mov dl, DATE_SEP ; now we can use dl for DATE_SEP call putchar call put_TwoDigits call putchar ; dl still holds DATE_SEP mov ax, cx ; cx = year sub ax, 1900 ; assume 20th century call put_TwoDigits mov dl, ' ' call putchar @@Time?: cmp [TFlag], 0 ; display time? jz SHORT @@FinalEOL? ; no call gettime mov al, ch ; ch = hour call put_TwoDigits mov dl, TIME_SEP call putchar mov al, cl ; cl = minutes call put_TwoDigits @@FinalEOL?: cmp [NFlag], 0 ; suppress final CR/LF? jnz SHORT @@Fin ; no mov dx, OFFSET EOL+1 call fputs ; ; Ok, let's terminate the program and exit with proper return code. ; @@Fin: mov al, [RCode] mov ah, 4ch int DOS EVEN ;-------------------------------------------------------------------------; ; Purpose: Gets current system date, based on DOS's internal clock. ; Notes: none ; Requires: 8086-class CPU and DOS v1.0 or better. ; Entry: n/a ; Exit: AL = day of week (0 = Sunday) ; DL = day (1 to 31) ; DH = month (1 to 12) ; CX = year (1980 to 2099) ; Calls: none ; Changes: AX, CX, DX ;-------------------------------------------------------------------------; PROC getdate mov ah, 2ah ; MS-DOS get system date function int DOS ret ENDP getdate 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: Writes a character to STDOUT device. ; Notes: none ; Requires: 8086-class CPU and DOS v1.0 or better. ; Entry: DL = character to display. ; Exit: n/a ; Calls: none ; Changes: none ;-------------------------------------------------------------------------; PROC putchar push ax mov ah, 2 int DOS pop ax ret ENDP putchar 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: Converts an *unsigned* integer in range [0, 65535] to ; an ASCIIZ string of digits. ; Notes: No checks are made to ensure storage area is big enough. ; A terminating null is added. ; Requires: 8086-class CPU. ; Entry: AX = unsigned integer value, ; ES:DI = pointer to string storage area. ; Exit: ES:DI = pointer to start of string. ; Calls: none ; Changes: DI ;-------------------------------------------------------------------------; PROC utoa Push_M <ax, bx, cx, dx, di> mov bx, 10 ; conversion factor Zero cx ; track # digits in string @@NewDigit: ; for each character Zero dx ; dx:ax is dividend so make dx 0 div bx ; ax = dx:ax / 10 push dx ; dx = dx:ax mod 10 inc cl ; one more digit processed or ax, ax ; anything left? jnz @@NewDigit @@NextChar: ; for each power of ten pop ax add al, '0' mov [BYTE PTR di], al inc di loop @@NextChar mov [BYTE PTR di], EOS ; don't forget to end it! Pop_M <di, dx, cx, bx, ax> ret ENDP utoa 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: 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