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Simple Assembly Question on Strings

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Join Date: Nov 2007

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Simple Assembly Question on Strings

Nov 25th, 2007

Hey people.

I'm trying to build a loop to move from Arthur Vandelay to Tim Pennypacker, to Bob Sacamano. I know how to move from 54 to 21 to -2 and so on but I can't get the code right to move from Arthur Vandelay to Tim Pennypacker. I know it's something simple that I'm missing but the online documentation is scarce.

 Help with Code Tags 
 Assembly Syntax (Toggle Plain Text) 
Emp1	db	'Arthur Vandelay',13,10,'$'
Num1	dw	54,21,-2,25
	db	'Tim Pennypacker',13,10,'$'
	dw	24,81,-14,22
	db	'Bob Sacamano',13,10,'$'
	dw	72,-9,-51,-22
Emp1	db	'Arthur Vandelay',13,10,'$'
Num1	dw	54,21,-2,25
	db	'Tim Pennypacker',13,10,'$'
	dw	24,81,-14,22
	db	'Bob Sacamano',13,10,'$'
	dw	72,-9,-51,-22

Much appreciated.

Last edited by art vandelay; Nov 25th, 2007 at 11:39 pm.

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Re: Simple Assembly Question on Strings

Nov 26th, 2007

I'm now trying mov bx,Offset Emp1+17 (or whatever the size of the previous string is.)

Last edited by art vandelay; Nov 26th, 2007 at 12:23 am.

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Re: Simple Assembly Question on Strings

Nov 26th, 2007

why don't you make it easy on yourself and give each one a name like you did Emp1 == use Emp2, Emp3, etc. Then I think you can create a jump table

Help with Code Tags

Assembly Syntax (Toggle Plain Text)

table  dw Emp1, Emp2, Emp3

Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.

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Re: Simple Assembly Question on Strings

Nov 26th, 2007

Based on your example and because you have variable length records SCASB is your best option

 Help with Code Tags 
 asm Syntax (Toggle Plain Text) 
mov     edi, Emp1
mov     al, '$'
xor     ecx, ecx
dec     ecx
repnz    scasb
mov     edi, Emp1
mov     al, '$'
xor     ecx, ecx
dec     ecx
repnz    scasb

Now you are pointing to the numeric values and you just have to add 8 to edi to point to the next employee.

Although this does work, it is very problematic. Fixed record lengths or pointers via a table as Ancient Dragon has pointed out are the best way s to go.

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Re: Simple Assembly Question on Strings

Dec 3rd, 2007

I ended up storing the offsets for each employee, but I'm switching to your solution for obvious reasons.

Now I'm trying to sort the data by last name, first name. Any tips?

Thanks.

Last edited by art vandelay; Dec 3rd, 2007 at 1:00 am.