Earlier today I wrote some assembly code to compare 2 strings and print out whether or not they were equal to one another. I’ve been learning more assembly and so I thought I would tweak it a bit to improve the way it works and add more “features”. After some studying I’ve managed to get it working as a real function that actually takes arguments via the stack. On top of that, the function now returns a value that designates the index where the comparison failed; this is stored in the EAX register. Even further, by using a buffer in memory I was able to print a string that informs the user of the index where the comparison failed.
Tag Archives: compare
Comparing Strings in Assembly
As part of my quest to improve my assembly skills I’ve been reviewing Vivek Ramachandran’s Assembly Primer for Hackers. I’ve nearly completed the series and I thought I would try out some of what I learned. I did my best to write this code completely from scratch and without reviewing the videos at all. I did peek at Professor Ben Abdallah’s reference guide to decide which loop instruction was appropriate and how to jump to the correct label after using cmp, but I didn’t feel like I was having to learn the material; it was used as a reference guide just as it was intended.