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> DOS > How hard is doing command line arguments? |
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Tomasz Grysztar 15 Oct 2006, 21:38
Code: org 100h label arguments_length byte at 80h label arguments_data byte at 81h mov ah,9 ; display string to stdout mov dx,_msg int 21h mov ah,40h ; write file mov bx,1 ; 1 - handle of stdout mov dx,arguments_data mov cl,[arguments_length] xor ch,ch ; number of bytes to write in CX int 21h ; writing to stdout displays the bytes int 20h ; exit program _msg db 'WAZZUP',24h |
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15 Oct 2006, 21:38 |
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vid 15 Oct 2006, 22:09
means, you don't have argc and argv, you just have simple string at CS:81h, whose length is stored in byte at CS:80h
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15 Oct 2006, 22:09 |
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Tomasz Grysztar 15 Oct 2006, 23:26
It's better to say PSP:80h - in case of MZ EXE it's also this way, though PSP is not necessarily CS.
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15 Oct 2006, 23:26 |
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vid 15 Oct 2006, 23:38
well.. it is more general, but less understandable. depends on which of these two you (or reader) prefers
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15 Oct 2006, 23:38 |
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2 16 Oct 2006, 05:43
Thanks! That helped me do this!
Code: org 256 mov ah,9 cmp byte[128],0 je p1 jmp p2 p1: mov dx,n int 33 jmp p3 p2: mov dx,y int 33 mov ah,64 mov bx,1 mov cl,[128] ;offset that says how many bytes the argument is xor ch,ch ;set ch to 0 so it won't interfere with the value of cx mov dx,129 ;space followed by arguments int 33 mov ah,9 mov dx,a int 33 p3: int 32 n db 'What is your name? You must tell me from the command line!',36 y db 'Hello',36 a db ', you are awesome!!!',36 |
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16 Oct 2006, 05:43 |
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rhyno_dagreat 17 Oct 2006, 03:19
Is it the same with Windows apps as well, making a call from CS:81h for the command line, that is?
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17 Oct 2006, 03:19 |
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Goplat 17 Oct 2006, 14:57
in Windows you use the GetCommandLine function to get a pointer to the command line. It has the program name in it as well as the arguments, though.
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17 Oct 2006, 14:57 |
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Picnic 23 Sep 2007, 14:37
Hello all,
I want to take only one parameter, remove head-tail spaces, and store on a buffer as a null terminated string. Length on cl. I wrote few lines below, (running xp console), am i ok? Code:
org 100h
mov si,82h
mov di,par
xor ch,ch
mov cl,[si-2]
jcxz exit
@@:
lodsb
cmp al,20h
jz @b
xor cl,cl
dec si
@@:
lodsb
stosb
cmp al,0dh
jz @f
cmp al,20h
jz @f
inc cl
jmp @b
@@:
mov byte [di],0
exit:
int 20h
par db 128 dup ?
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23 Sep 2007, 14:37 |
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rugxulo 07 Oct 2007, 02:58
You could use WDOSX as a DOS extender. If you use NASM's RDOFF (maybe other? formats), it sets up argc, **argv for you.
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07 Oct 2007, 02:58 |
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