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Groups > comp.lang.c > #395761

Re: is_binary_file()

From Michael S <already5chosen@yahoo.com>
Newsgroups comp.lang.c
Subject Re: is_binary_file()
Date 2025-12-10 19:00 +0200
Organization A noiseless patient Spider
Message-ID <20251210190038.0000617a@yahoo.com> (permalink)
References <10gvvh8$1vv6e$1@dont-email.me> <10h01k8$1ta3h$1@dont-email.me> <10h02nm$1ta3h$2@dont-email.me> <10hbluk$1fc0e$1@dont-email.me> <S0g_Q.170822$l1A9.2749@fx10.iad>

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On Wed, 10 Dec 2025 15:07:30 GMT
scott@slp53.sl.home (Scott Lurndal) wrote:

> Michael Sanders <porkchop@invalid.foo> writes:
> >On Sat, 6 Dec 2025 02:00:22 -0000 (UTC), Lew Pitcher wrote:
> >  
> >> I should have added that I feel that you probably haven't really
> >> defined /what/ "text file" means, and that has interfered with
> >> the development of this function. As Keith pointed out, the task
> >> of distinguishing between a "text" file and a "binary" file is not
> >> easy. I'll add that a lot of the difficulty stems from the fact
> >> that there are many definitions (some conflicting) of what a "text"
> >> file actually contains.  
> >
> >Yes. Here's my 2nd attempt following the template (of thinking)
> >you've suggested...  
> 
> The problem with all of your attempts is the performance
> issue.  Success requires reading every single byte of the
> file, one byte at a time.   The word 'slow' is not sufficient
> to describe how bad the performance will be for a very large
> file.
> 
> At a minimum, dump the stdio double-buffered byte-by-byte
> algorithm and use mmap().
> 

I suggest to do actual speed measurements before making bold
claims like above. Don't trust your intuition!

> In reality, I still don't see any benefit to this type of
> heuristic-based approach.
> 

Neither do I. But OP is not doing it for us, but for himself.

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Thread

is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-06 01:05 +0000
  Re: is_binary_file() Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-06 01:41 +0000
    Re: is_binary_file() Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-06 02:00 +0000
      Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 17:40 +0000
      Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 11:35 +0000
        Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-10 15:07 +0000
          Re: is_binary_file() Michael S <already5chosen@yahoo.com> - 2025-12-10 19:00 +0200
            Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-10 17:18 +0000
              Re: is_binary_file() Richard Heathfield <rjh@cpax.org.uk> - 2025-12-10 19:42 +0000
                Re: is_binary_file() bart <bc@freeuk.com> - 2025-12-10 22:37 +0000
                Re: is_binary_file() Paul <nospam@needed.invalid> - 2025-12-10 22:35 -0500
                Re: is_binary_file() bart <bc@freeuk.com> - 2025-12-11 11:46 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-11 12:53 +0100
          Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 18:42 +0000
        Re: is_binary_file() Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-10 15:58 +0000
          Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 18:44 +0000
        Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-10 12:46 -0500
          Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 18:45 +0000
        Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 18:41 +0000
          Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 20:57 +0000
            Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-10 22:07 +0000
              Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-11 01:09 +0000
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-11 12:33 +0000
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-12 19:25 +0000
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-12 22:54 +0000
                Re: is_binary_file() "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-12 15:33 -0800
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-13 00:20 +0000
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-13 02:32 +0000
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-16 00:26 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-16 17:24 +0100
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-17 03:19 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-17 07:57 +0100
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-17 19:35 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-18 08:44 +0100
                Re: is_binary_file() bart <bc@freeuk.com> - 2025-12-18 12:49 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-18 14:06 +0100
                Re: is_binary_file() gazelle@shell.xmission.com (Kenny McCormack) - 2025-12-18 13:17 +0000
                Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-18 16:03 +0100
  Re: is_binary_file() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-05 17:42 -0800
    Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-06 17:37 +0000
      Re: is_binary_file() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-06 16:05 -0800
      Re: is_binary_file() Louis Krupp <lkrupp@invalid.pssw.com.invalid> - 2025-12-07 03:43 -0700
        Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-07 16:47 +0000
        Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-27 03:18 +0000
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 17:46 +0000
  Re: is_binary_file() Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-06 02:42 +0000
    Re: is_binary_file() bart <bc@freeuk.com> - 2025-12-06 12:42 +0000
    Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-06 17:40 +0000
      Re: is_binary_file() Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-06 18:04 +0000
        Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-06 19:06 +0000
          Re: is_binary_file() Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2025-12-06 21:16 +0000
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 17:48 +0000
      Re: is_binary_file() Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-08 19:26 +0000
        Re: is_binary_file() Richard Heathfield <rjh@cpax.org.uk> - 2025-12-08 19:42 +0000
        Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-09 21:49 +0000
  Re: is_binary_file() Paul <nospam@needed.invalid> - 2025-12-06 03:14 -0500
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 17:56 +0000
      Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-08 20:16 +0000
        Re: is_binary_file() David Brown <david.brown@hesbynett.no> - 2025-12-09 09:03 +0100
          Re: is_binary_file() Richard Heathfield <rjh@cpax.org.uk> - 2025-12-09 09:43 +0000
            Re: is_binary_file() Richard Harnden <richard.nospam@gmail.invalid> - 2025-12-09 10:17 +0000
              Re: is_binary_file() Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-09 20:15 +0000
          Re: is_binary_file() tTh <tth@none.invalid> - 2025-12-09 12:22 +0100
            Re: is_binary_file() Paul <nospam@needed.invalid> - 2025-12-09 20:26 -0500
          Re: is_binary_file() Paul <nospam@needed.invalid> - 2025-12-09 06:38 -0500
            Re: is_binary_file() Michael S <already5chosen@yahoo.com> - 2025-12-09 17:31 +0200
            Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-28 02:49 +0000
    Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-28 00:12 +0000
      Re: is_binary_file() richard@cogsci.ed.ac.uk (Richard Tobin) - 2025-12-28 00:43 +0000
  Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-06 17:33 +0000
    Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-07 19:04 +0100
  Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-06 20:37 -0500
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 18:02 +0000
    Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-09 16:29 -0500
      Re: is_binary_file() Michael S <already5chosen@yahoo.com> - 2025-12-10 11:21 +0200
        Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-10 12:48 -0500
      Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 11:38 +0000
  Re: is_binary_file() antispam@fricas.org (Waldek Hebisch) - 2025-12-07 03:43 +0000
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 18:04 +0000
      Re: is_binary_file() bart <bc@freeuk.com> - 2025-12-08 18:44 +0000
        Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-09 19:53 +0000
          Re: is_binary_file() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-09 15:42 -0800
            Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 11:41 +0000
              Re: is_binary_file() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-10 15:20 -0800
                Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-10 23:59 +0000
        Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-09 16:23 -0500
  Re: is_binary_file() Richard Harnden <richard.nospam@gmail.invalid> - 2025-12-07 19:01 +0000
    Re: is_binary_file() Richard Heathfield <rjh@cpax.org.uk> - 2025-12-07 21:51 +0000
      Re: is_binary_file() Richard Harnden <richard.nospam@gmail.invalid> - 2025-12-07 22:49 +0000
      Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-08 13:51 +0100
        Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-08 16:04 +0000
          Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-08 19:27 +0100
        Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-27 05:51 +0000
          Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-29 16:06 +0100
            Re: is_binary_file() mjos_examine <m6502x64@gmail.com> - 2025-12-29 11:49 -0500
              Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-29 20:49 +0100
            Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-30 01:52 +0000
      Re: is_binary_file() scott@slp53.sl.home (Scott Lurndal) - 2025-12-08 16:02 +0000
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 18:07 +0000
    Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-27 03:13 +0000
      Re: is_binary_file() Paul <nospam@needed.invalid> - 2025-12-27 01:28 -0500
        Re: is_binary_file() Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-27 21:27 +0000
        Re: is_binary_file() antispam@fricas.org (Waldek Hebisch) - 2025-12-28 05:46 +0000
  Re: is_binary_file() "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-07 14:42 -0800
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-08 18:09 +0000
      Re: is_binary_file() "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-09 12:45 -0800
  Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-08 20:36 +0100
    Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-08 20:50 +0100
      Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-09 15:09 +0100
    Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-10 09:18 +0100
  Re: is_binary_file() Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-08 14:43 -0800
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-09 21:38 +0000
  Re: is_binary_file() Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-11 17:33 +0000
    Re: is_binary_file() Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-11 19:10 +0100
    Re: is_binary_file() "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-11 14:56 -0800
    Re: is_binary_file() James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-11 18:15 -0500
    Re: is_binary_file() Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-12 02:19 +0100
    Re: is_binary_file() Michael Sanders <porkchop@invalid.foo> - 2025-12-14 08:27 +0000
    Re: is_binary_file() Lynn McGuire <lynnmcguire5@gmail.com> - 2025-12-17 00:52 -0600

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