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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!eternal-september.org!.POSTED!not-for-mail From: Janis Papanagnou <janis_papanagnou+ng@hotmail.com> Newsgroups: comp.lang.c Subject: Re: Two questions on arrays with size defined by variables Date: Sun, 9 Feb 2025 18:18:04 +0100 Organization: A noiseless patient Spider Lines: 27 Message-ID: <voao0d$o71o$1@dont-email.me> References: <vo9mns$gsd7$1@dont-email.me> <vo9nn3$gtph$1@dont-email.me> <vo9u0u$i0n8$1@dont-email.me> <20250209123918.0000754f@yahoo.com> MIME-Version: 1.0 Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Injection-Date: Sun, 09 Feb 2025 18:18:06 +0100 (CET) Injection-Info: dont-email.me; posting-host="9f9c4a4d467cd7826f6af056aa0b049d"; logging-data="793656"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+/V092PCl+j9SEQjZKD5vE" User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 Cancel-Lock: sha1:YVMnZ9mTygxlIcMt/VOHICFmPJc= X-Enigmail-Draft-Status: N1110 In-Reply-To: <20250209123918.0000754f@yahoo.com> Bytes: 2252 On 09.02.2025 11:39, Michael S wrote: > On Sun, 9 Feb 2025 10:54:36 +0100 > Janis Papanagnou <janis_papanagnou+ng@hotmail.com> wrote: > [...] > > There is another problem in your code - it assigns string literal to > non-const char*. It is legal, as far as 'C' Standard is concerned, but > makes very little practical sense, because any attempt to assign to > string literal through resulting pointer is UB. And not just a > theoretical UB, but a real-world UB. This comment specifically draw my attention and made me nervous. You know, I'm rarely programming in plain "C", and while in C++ I generally try to program in "const-correct" form I never make use of 'const' in "C". - Unless the compiler complains about it, but I don't recall it (ever?) did. In my test application I actually never assign string literals or strings to any other string object (modulo the buffer that I filled with a 'fgets'). I operate solely with pointers to 'argv' elements and to the 'char buf[]' buffer data. Do you see any issue with that? Janis