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Thanks, I understand the problem with using memory after it’s been freed and possibly access it changed by another part of the process. I guess I was confused by the double free explanation I read, which didn’t really say how it could be exploited, but I think you are right it still needs to be accessed later by the original program, which would not happen in Rust.
DrawExpress is very intuitive to use on a phone, but the files may not be editable in other software. It exports as SVG, PNG, or pdf.