tree 4e0cfeb2622ad0101466294bb02e965fd88cd80b
parent 3fcd831a6d2dfed2233685e94018b15c122d6d7e
author Jiyong Park <jiyong@google.com> 1560324304 +0900
committer Jiyong Park <jiyong@google.com> 1560490176 +0900

Add Errorf and ErrnoErrorf

String formatting for error message can be done by using Errorf and
ErrnoErrorf. e.g. `return Errorf("{} failures", num_failure);`

The string format follows that of fmtlib, not printf.

Bug: 132145659
Test: libbase_test
Change-Id: I65f45d5f12ed23e2c14d6eb442278f467cc42e83