xiaobai added a comment.
Over the weekend I dug into this further. It looks like the environment I found
this bug in didn't have C++11 support and was using `std::string::length()`,
which tries to perform a memory read where it's not supposed to, resulting in a
segfault.
On my friend's Ubuntu server, it used `std::basic_string::length()` (since I
had C++11 support). By sheer luck, `std::basic_string::length()` read a memory
location that was indeed mapped but contained unrelated data. This isn't a
breaking behavior since we use the result mod 80 to calculate `toColumn`, and
immediately after the `MoveCursor` call we `fprintf("\n")`. I still think this
is an issue.
As for the pexpect test, I tried to make it as simple as possible while
maintaining the general style/feel of the test you suggested I look at. It
passes when I run it with `dotest.py`, but I'm not sure if it should do more.
I'm interested to see what you think.
https://reviews.llvm.org/D32421
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