How to save the quantity of digits in constant during work

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Sloppysecond

Joined: 01 May 2017
Posts: 8

Sloppysecond 17 May 2017, 23:28

Hello there!
I get the number from the keyborad using function ReadConsole which saves the length of the inputed number in one of its arguments.
How could i use this argument as an index of array? (The number it is the array which i define as

Code:

number db 500 dup(0)

I used to use constants or registers in such situatons but in this case all registers are busy and i can not do something like that :

Code:

length_number = 0
length_number = [symbols_was_read]

Code:

mov ecx,  [symbols_was_read] (now it is free but it will be used later and can not use as index)
length_number = ecx
How can i create run-time constant in FASM?

I was invented lots of variants but all of them fallen.
And i always wanted to know why can not i do such thing :

Code:

mov cl,[first_number + [symbols_was_read]]

(Use normal variable as an index).

17 May 2017, 23:28

revolution
When all else fails, read the source

Joined: 24 Aug 2004
Posts: 20481
Location: In your JS exploiting you and your system

revolution 18 May 2017, 11:18

If all the registers are in use then you don't really have any other options. Just save one of the register values to somewhere and then use the now free register for other processing. Usually a convenient place to save temporary values is the stack.

18 May 2017, 11:18

Sloppysecond

Joined: 01 May 2017
Posts: 8

Sloppysecond 18 May 2017, 15:58

revolution wrote:

If all the registers are in use then you don't really have any other options. Just save one of the register values to somewhere and then use the now free register for other processing. Usually a convenient place to save temporary values is the stack.

I will try to do it.
Thank you for the answer!

18 May 2017, 15:58

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