CODEWITHSUNDEEP
stringassemblyx86
shades
shades

Reputation: 13

Converting String to DWORD (Assembly x86)

I am trying to learn how to convert a string to an integer. I think I am pretty close. My code works for numbers under 260. Once the numbers entered are greater than or equal to 260, then it just converts them to 0. I think it might have something to do with the size of a BYTE, but I'm not sure how to fix it. Any suggestions? Some Irvine functions are included, but I'm trying to write my own ReadInt function.

Upvotes: 1

Views: 966

Answers (1)

Greg Hewgill
Greg Hewgill

Reputation: 993085

I can see the problem. Rather than giving away the answer completely, here's a hint:

The lodsb instruction loads one byte into al (which is the low 8 bits of eax). The rest of eax is unchanged. What might cause eax to contain extra bits that aren't changed by lodsb?

Upvotes: 1

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