I am almost a year into a job where the main piece of software is a mix of C and C++ and there is no documentation, hardly even code comments. Some of the files say they were created over a decade ago. Just pages and pages of C code with no comments and no external design docs.
If I search my local copy of the source for .c and .cpp files, I get 1,485 items. But it’s not that bad because many files show up several times in different directories with the same name. :D
And you know, I HAVE been feeling better about myself lately! (The job is actually a perfect fit for me, other than the humongous scary & opaque code base)