forked from AbleScript/ablescript
Merge pull request #43 from T-Dark0/T-Dark_fix_brainfuck_overflows
Fixed integer overflows. Why did I even write `checked_add` in the first place?
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commit
f82ad34e34
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@ -110,14 +110,14 @@ impl<'a, I: BootlegRead> Interpreter<'a, I> {
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let val = self
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.get_or_resize_tape_mut()
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.ok_or(ProgramError::TapeSizeExceededLimit)?;
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*val = val.checked_add(1).ok_or(ProgramError::IntegerOverflow)?;
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*val = val.wrapping_add(1)
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}
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b'-' => {
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let val = self
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.get_or_resize_tape_mut()
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.ok_or(ProgramError::TapeSizeExceededLimit)?;
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*val = val.checked_sub(1).ok_or(ProgramError::IntegerUnderflow)?;
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*val = val.wrapping_sub(1)
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}
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b'.' => {
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@ -282,8 +282,6 @@ pub enum IoStatus {
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/// An error that occurred while the interpreter was advancing
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pub enum ProgramError {
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DataPointerUnderflow,
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IntegerOverflow,
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IntegerUnderflow,
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InputReadError,
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UnmatchedOpeningBracket,
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UnmatchedClosingBracket,
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@ -297,8 +295,6 @@ impl Display for ProgramError {
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"{}",
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match self {
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ProgramError::DataPointerUnderflow => "data pointer underflow",
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ProgramError::IntegerOverflow => "integer overflow",
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ProgramError::IntegerUnderflow => "integer underflow",
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ProgramError::InputReadError => "input read error",
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ProgramError::UnmatchedOpeningBracket => "unmatched `[`",
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ProgramError::UnmatchedClosingBracket => "unmatched `]`",
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@ -442,4 +438,14 @@ mod tests {
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))
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);
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}
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#[test]
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fn positive_integer_overflow() {
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interpret_with_io(b"+[+]", std::io::empty(), std::io::sink()).unwrap();
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}
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#[test]
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fn negative_integer_overflow() {
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interpret_with_io(b"-", std::io::empty(), std::io::sink()).unwrap();
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}
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}
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