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Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: Lawrence D'Oliveiro <ldo@nz.invalid> Newsgroups: comp.lang.c Subject: Re: xxd -i vs DIY Was: C23 thoughts and opinions Date: Mon, 3 Jun 2024 07:49:00 -0000 (UTC) Organization: A noiseless patient Spider Lines: 11 Message-ID: <v3jshc$3q731$1@dont-email.me> References: <v2l828$18v7f$1@dont-email.me> <00297443-2fee-48d4-81a0-9ff6ae6481e4@gmail.com> <v2lji1$1bbcp$1@dont-email.me> <87msoh5uh6.fsf@nosuchdomain.example.com> <f08d2c9f-5c2e-495d-b0bd-3f71bd301432@gmail.com> <v2nbp4$1o9h6$1@dont-email.me> <v2ng4n$1p3o2$1@dont-email.me> <87y18047jk.fsf@nosuchdomain.example.com> <87msoe1xxo.fsf@nosuchdomain.example.com> <v2sh19$2rle2$2@dont-email.me> <87ikz11osy.fsf@nosuchdomain.example.com> <v2v59g$3cr0f$1@dont-email.me> <20240528144118.00002012@yahoo.com> <v34odg$kh7a$1@dont-email.me> <20240528185624.00002494@yahoo.com> <v359f1$nknu$1@dont-email.me> <20240528232315.00006a58@yahoo.com> <v35qrg$qhnf$1@dont-email.me> <20240529123852.000026e4@yahoo.com> <v37386$148la$1@dont-email.me> <20240529152325.000042e1@yahoo.com> <v37db5$15p5b$1@dont-email.me> <20240529183218.000027c2@yahoo.com> <v37pc5$186go$1@dont-email.me> <v383bp$19tqg$1@dont-email.me> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Injection-Date: Mon, 03 Jun 2024 09:49:01 +0200 (CEST) Injection-Info: dont-email.me; posting-host="9e096ebffcd2a0af55f8dc29da216a8b"; logging-data="4004961"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX1+ByHs/KOGh+tTtWiWAKO/+" User-Agent: Pan/0.158 (Avdiivka; ) Cancel-Lock: sha1:OPGrBrfb8a664tozJvBMqeBS0J8= Bytes: 2324 On Wed, 29 May 2024 21:31:54 +0100, bart wrote: > Conclusion: beating xxd is apparently not hard if even a scripting > language can do so. I wonder what slows it down? It’s written in a very stdio-dependent vanilla C style. Have a look at the source for yourself. It’s part of the “vim” package on Debian and no doubt other distros. The xxd binary itself is built from a single source file of just some 1200 lines, and the hex-to-binary conversion is done in a function called “huntype” of just 133 lines.