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From: Jason Merrill <jason@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org Subject: [gcc r14-1954] libcpp: reject codepoints above 0x10FFFF Date: Mon, 19 Jun 2023 21:20:54 +0000 (GMT) [thread overview] Message-ID: <20230619212054.BDE783898513@sourceware.org> (raw) https://gcc.gnu.org/g:c1dbaa6656acc62c586dad1018f06113cde2d8a4 commit r14-1954-gc1dbaa6656acc62c586dad1018f06113cde2d8a4 Author: Ben Boeckel <ben.boeckel@kitware.com> Date: Tue Jun 6 16:50:22 2023 -0400 libcpp: reject codepoints above 0x10FFFF Unicode does not support such values because they are unrepresentable in UTF-16. libcpp/ * charset.cc: Reject encodings of codepoints above 0x10FFFF. UTF-16 does not support such codepoints and therefore all Unicode rejects such values. Signed-off-by: Ben Boeckel <ben.boeckel@kitware.com> Diff: --- libcpp/charset.cc | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/libcpp/charset.cc b/libcpp/charset.cc index d7f323b2cd5..d4f573e365f 100644 --- a/libcpp/charset.cc +++ b/libcpp/charset.cc @@ -1886,6 +1886,13 @@ cpp_valid_utf8_p (const char *buffer, size_t num_bytes) int err = one_utf8_to_cppchar (&iter, &bytesleft, &cp); if (err) return false; + + /* Additionally, Unicode declares that all codepoints above 0010FFFF are + invalid because they cannot be represented in UTF-16. + + Reject such values.*/ + if (cp >= UCS_LIMIT) + return false; } /* No problems encountered. */ return true;
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