[PATCH v2 0/2] commit: improve UTF-8 validation

This series contains a pair of patches that improve the validation of the UTF-8 used in commit messages. Invalid codepoints, such as surrogates and guaranteed non-characters, are rejected, along with overlong UTF-8 sequences.

Changes from v1:

* Improved comments to aid those less familiar with Unicode.
* Generated test files using printf as part of the test.
* Removed FIXME comments for things that have been fixed.
* Use a shorter form for detecting surrogate pairs.

brian m. carlson (2):
  commit: reject invalid UTF-8 codepoints
  commit: reject overlong UTF-8 sequences

 commit.c               | 34 ++++++++++++++++++++++++++++------
 t/t3900-i18n-commit.sh | 23 +++++++++++++++++++++++
 2 files changed, 51 insertions(+), 6 deletions(-)