[caffe2] use snprintf() instead of sprintf() in the Checkpoint operator (#53434)
Summary:
Pull Request resolved: https://github.com/pytorch/pytorch/pull/53434
Use `snprintf()` to avoid buffer overflows.
Also only throw an exception on error, instead of crashing the entire
application. A failure can occur if the caller supplies an invalid format
string.
ghstack-source-id: 123401582
Test Plan:
Ran the checkpoint tests:
buck test caffe2/caffe2/python/operator_test:checkpoint_test
Verified that the checkpoint file names logged in the output are the same
before and after this change.
I also tested manually changed the initial buffer size to 1 to confirm that
the code works when the initial buffer size is too small. I considered
updating the checkpoint_test.py code to test using long db names that would
exceed this limit, but I figured that long filenames was likely to cause
other problems on some platforms (Windows has a maximum path length of 260
characters up until pretty recent releases).
Differential Revision: D26863355
fbshipit-source-id: 8fc24faa2a8dd145471067718d323fdc8ce055d6
