linux nasm assembly isolating characters in a string

Question

If I had a string declared like this:

message db "ABCDEFGHIJ",0

how could I create a pointer that would allow me to point to a specific character in this string, such as the 'A' character. And also, how could I create a loop that would allow me to increment the pointer and as a result, cycle through the entire string?

Unihedron · Accepted Answer · 2015-02-18 06:57:53Z

5

    mov ecx, message ; Masm would use "offset"
top:
    mov al, [ecx] ; get a character
    inc ecx  ; get ready for next one
    cmp al, 0  ; end of string?
    jz done
; do something intelligent with al
    jmp top
done:

edited Feb 18, 2015 at 6:57

Unihedron

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answered Oct 25, 2012 at 7:05

Frank Kotler

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1 Comment

Progrmr Over a year ago

Simple yet effective. Thank you.

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