patch, 2 partscommit: 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.

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

 commit.c                   | 28 +++++++++++++++++++++++++---
 t/t3900-i18n-commit.sh     | 17 +++++++++++++++++
 t/t3900/UTF-8-invalid.txt  |  3 +++
 t/t3900/UTF-8-overlong.txt |  3 +++
 4 files changed, 48 insertions(+), 3 deletions(-)
 create mode 100644 t/t3900/UTF-8-invalid.txt
 create mode 100644 t/t3900/UTF-8-overlong.txt