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showargs.asm
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Assembly Source File
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1988-09-13
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4KB
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126 lines
title SHOWARGS -- ARGC and ARGV demo
page 55,132
.286
;
; SHOWARGS.ASM --- demonstrate command line parsing
; with ARGC.ASM and ARGV.ASM
;
; OS/2 version 9/2/87 (C) 1987 Ray Duncan
;
stdin equ 0 ; standard input handle
stdout equ 1 ; standard output handle
stderr equ 2 ; standard error handle
cr equ 0dh ; ASCII carriage return
lf equ 0ah ; ASCII line feed
blank equ 020h ; ASCII blank
tab equ 09h ; ASCII tab
extrn argc:near ; returns argument count
extrn argv:near ; returns argument pointer
; OS/2 API functions
extrn DosWrite:far ; write file or device
extrn DosExit:far ; terminate process
DGROUP group _DATA
_DATA segment word public 'DATA'
curarg dw 0 ; current command line argument
totargs dw 0 ; total command line arguments
wlen dw ? ; bytes actually written
msg1 db cr,lf
db 'The command line contains '
msg1a db 'xx arguments'
msg1_len equ $-msg1
msg2 db cr,lf
db 'Argument '
msg2a db 'xx is: '
msg2_len equ $-msg2
_DATA ends
_TEXT segment word public 'CODE'
assume cs:_TEXT,ds:DGROUP
main proc far ; entry point from OS/2
call argc ; get and save number of
mov totargs,ax ; command line arguments
mov bx,offset msg1a ; convert argument count
call b2dec ; to ASCII for output
; display argument count
push stdout ; standard output handle
push ds ; address of message
push offset DGROUP:msg1
push msg1_len ; length of message
push ds ; receives bytes written
push offset DGROUP:wlen
call DosWrite ; transfer to OS/2
main1: mov ax,curarg ; display next argument
cmp ax,totargs ; are we all done?
je main2 ; yes, exit
mov bx,offset msg2a ; no, convert argument
call b2dec ; number to ASCII
; display argument number
push stdout ; standard output handle
push ds ; address of message
push offset DGROUP:msg2
push msg2_len ; length of message
push ds ; receives bytes written
push offset DGROUP:wlen
call DosWrite ; transfer to OS/2
mov ax,curarg ; now get actual argument
call argv ; ES:BX=addr,AX=length
push stdout ; standard output handle
push es ; command argument address
push bx
push ax ; command argument length
push ds ; receives bytes written
push offset DGROUP:wlen
call DosWrite ; transfer to OS/2
inc word ptr curarg ; go to next argument
jmp main1
main2: push 1 ; terminate process
push 0 ; return code = zero
call DosExit ; final exit to OS/2
main endp
b2dec proc near ; convert binary 0-99
; to decimal ASCII
; call with
; AL = binary data
; BX = addr. for 2 chars.
aam ; divide AL by 10, leaving
; AH=quotient, AL=remainder
add ax,'00' ; convert to ASCII
mov [bx],ah ; store ten's digit
mov [bx+1],al ; store one's digit
ret ; return to caller
b2dec endp
_TEXT ends
end main ; defines entry point