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[130.44.146.16]) by smtp.gmail.com with ESMTPSA id i28-20020a05620a145c00b0075edc88457asm319777qkl.135.2023.06.19.14.34.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 19 Jun 2023 14:34:23 -0700 (PDT) Message-ID: <8e347f55-8102-a2a0-a98d-7d3155d1ea8a@redhat.com> Date: Mon, 19 Jun 2023 17:34:22 -0400 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.12.0 Subject: Re: [PATCH v6 1/4] libcpp: reject codepoints above 0x10FFFF To: Ben Boeckel , gcc-patches@gcc.gnu.org Cc: nathan@acm.org, fortran@gcc.gnu.org, gcc@gcc.gnu.org, brad.king@kitware.com References: <20230606205025.3164738-1-ben.boeckel@kitware.com> <20230606205025.3164738-2-ben.boeckel@kitware.com> From: Jason Merrill In-Reply-To: <20230606205025.3164738-2-ben.boeckel@kitware.com> X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-13.7 required=5.0 tests=BAYES_00,DKIMWL_WL_HIGH,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,GIT_PATCH_0,NICE_REPLY_A,RCVD_IN_DNSWL_NONE,RCVD_IN_MSPIKE_H5,RCVD_IN_MSPIKE_WL,SPF_HELO_NONE,SPF_NONE,TXREP,T_SCC_BODY_TEXT_LINE autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: On 6/6/23 16:50, Ben Boeckel wrote: > Unicode does not support such values because they are unrepresentable in > UTF-16. Pushed. > 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 > --- > libcpp/charset.cc | 7 +++++++ > 1 file changed, 7 insertions(+) > > diff --git a/libcpp/charset.cc b/libcpp/charset.cc > index d7f323b2cd5..3b34d804cf1 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 >= 0x10FFFF) > + return false; > } > /* No problems encountered. */ > return true;