commit: reject non-characters

Unicode clause D14 defines all characters U+nFFFE and U+nFFFF (where
0 <= n <= 10h) as well as the range U+FDD0..U+FDEF as non-characters,
reserved for internal use only.  Disallow these characters in commit
messages as they are normally not recommended for interchange.

Signed-off-by: Peter Krefting <peter@softwolves.pp.se>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

diff --git a/commit.c b/commit.c
index 5097dba3928fe7ca19f0010cd1fe8db6fd5d3622..7dcfeea2d9f98b223d84f87f40901190dcb8b719 100644 (file)
--- a/commit.c
+++ b/commit.c
@@ -1305,8 +1305,11 @@ static int find_invalid_utf8(const char *buf, int len)
                /* Surrogates are only for UTF-16 and cannot be encoded in UTF-8. */
                if ((codepoint & 0x1ff800) == 0xd800)
                        return bad_offset;
-               /* U+FFFE and U+FFFF are guaranteed non-characters. */
-               if ((codepoint & 0x1ffffe) == 0xfffe)
+               /* U+xxFFFE and U+xxFFFF are guaranteed non-characters. */
+               if ((codepoint & 0xffffe) == 0xfffe)
+                       return bad_offset;
+               /* So are anything in the range U+FDD0..U+FDEF. */
+               if (codepoint >= 0xfdd0 && codepoint <= 0xfdef)
                        return bad_offset;
        }
        return -1;

diff --git a/t/t3900-i18n-commit.sh b/t/t3900-i18n-commit.sh
index 051ea9d3c289d825601aed0a3055b1565370dc3a..38b00c37b0606a5442f2dce02647a019f0c80c9e 100755 (executable)
--- a/t/t3900-i18n-commit.sh
+++ b/t/t3900-i18n-commit.sh
@@ -58,6 +58,24 @@ test_expect_success 'UTF-8 overlong sequences rejected' '
        grep "did not conform" "$HOME"/stderr
 '
 
+test_expect_success 'UTF-8 non-characters refused' '
+       test_when_finished "rm -f $HOME/stderr $HOME/invalid" &&
+       echo "UTF-8 non-character 1" >F &&
+       printf "Commit message\n\nNon-character:\364\217\277\276\n" \
+               >"$HOME/invalid" &&
+       git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
+       grep "did not conform" "$HOME"/stderr
+'
+
+test_expect_success 'UTF-8 non-characters refused' '
+       test_when_finished "rm -f $HOME/stderr $HOME/invalid" &&
+       echo "UTF-8 non-character 2." >F &&
+       printf "Commit message\n\nNon-character:\357\267\220\n" \
+               >"$HOME/invalid" &&
+       git commit -a -F "$HOME/invalid" 2>"$HOME"/stderr &&
+       grep "did not conform" "$HOME"/stderr
+'
+
 for H in ISO8859-1 eucJP ISO-2022-JP
 do
        test_expect_success "$H setup" '