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[81.101.252.173]) by smtp.gmail.com with ESMTPSA id t10-20020a05600c198a00b004064ac107cfsm610522wmq.39.2023.11.01.13.16.55 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 01 Nov 2023 13:16:55 -0700 (PDT) Message-ID: Date: Wed, 1 Nov 2023 20:16:54 +0000 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: glibc misc/sys/cdefs.h nonull - typo in comment Content-Language: en-GB To: Florian Weimer Cc: Paul Eggert , Adhemerval Zanella Netto , GNU C Library , Xi Ruoyao References: <25d0b6fa-7b45-3f8e-946a-ad3256e211a4@jguk.org> <0d99df74-fb83-1647-ca19-17d2229f0ae0@linaro.org> <514c11a4-405b-f7f3-9a67-0b6c10ad7740@jguk.org> <21bc9125ab8ced26aa85f3f787f084c4af460a18.camel@xry111.site> <84e4081c-35ef-4f2d-89d0-0fea04732737@cs.ucla.edu> <87cywtvs7r.fsf@mid.deneb.enyo.de> <739d8f2c-af88-46b5-ac83-76392640753c@jguk.org> <87h6m5tf1g.fsf@mid.deneb.enyo.de> From: Jonny Grant In-Reply-To: <87h6m5tf1g.fsf@mid.deneb.enyo.de> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Spam-Status: No, score=-3.0 required=5.0 tests=BAYES_00,DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_NONE,SPF_HELO_NONE,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham 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 01/11/2023 20:05, Florian Weimer wrote: > * Jonny Grant: > >> As I read it, the C standard wording doesn't make it 100% clear for >> readers that strcmp or strncmp will stop comparing when it reads a >> null terminating byte, in either, or both strings. It is probably >> implied from other description of C strings in the standard. Perhaps >> the standard could be clarified. > > But strncmp doesn't operate on strings. The standard talks about > arrays, which makes sense given the historic usage (fixed-length > strings). My apologies. C23 7.26.4.4 strncmp does indeed state 'array', and it does stop at the null terminator. C23 7.26.4.2 strcmp states 'string'. Jonny