Re: srand(0)

From	Michael S <already5chosen@yahoo.com>
Newsgroups	comp.lang.c
Subject	Re: srand(0)
Date	2026-01-02 14:32 +0200
Organization	A noiseless patient Spider
Message-ID	<20260102143207.00002ae3@yahoo.com> (permalink)
References	(16 earlier) <10j2qs4$2fbu5$1@dont-email.me> <10j57ui$3aao2$2@dont-email.me> <10j6gcp$3mtri$3@dont-email.me> <20260101215320.00004497@yahoo.com> <10j7178$3tgvf$1@dont-email.me>

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On Thu, 1 Jan 2026 23:50:00 -0000 (UTC)
Lawrence D’Oliveiro <ldo@nz.invalid> wrote:

> On Thu, 1 Jan 2026 21:53:20 +0200, Michael S wrote:
> 
> > On Thu, 1 Jan 2026 19:02:49 -0000 (UTC)
> > Lawrence D’Oliveiro <ldo@nz.invalid> wrote:
> >  
> >> All those are at the sending end. But what would C code see at the
> >> receiving end?  
> >
> > The first three cases look very simple.  
> 
> Is there some spec in Windows which describes how that works?

There is a spec that describes how that works in Microsoft's
implementation. That implementation is available free of charge to
other Windows compilers.
If vendor of Windows 'C' compiler decided to implement different
algorithm then nobody can stop him.

Through the years you were told so, by different people, and shown
the spec may be 100 times. But being the trolll you are, you continue
to ask.

Still, for the benefit of more sincere readers and also for myself, in
order to have both pieces in one place:
https://learn.microsoft.com/en-us/windows/win32/api/shellapi/nf-shellapi-commandlinetoargvw
https://learn.microsoft.com/en-us/cpp/c-language/parsing-c-command-line-arguments

More interesting and meaningful question is how to do the reverse.
I.e. how to convert an argv[] array into flat form in a way that
guarantees that CommandLineToArgvW() parses it back into original form?
Is it even possible in general case or there exist limitations
(ignoring, for sake of brevity, 2*15-1 size limit)?

Microsoft certainly has reverse conversion implemented, e.g. here:
https://learn.microsoft.com/en-us/cpp/c-runtime-library/reference/spawnv-wspawnv

But I am not aware of command line serialization part available as a
library call in isolation from process creation part.

I binged around and googled around, but all I was able to find was the
name of the function that performs the work:
__acrt_pack_wide_command_line_and_environment 

I was not able to find the source code of the function.

[O.T.]
I am sure that 15, 10 or even 5 years ago Google would give me link to
the source in a second. Or, may be, 5 years ago Google already
wouldn't, but Bing still would.
But today both search engines are hopelessly crippled with AI and do not
appear to actually search the web. Instead, the try to guess the
answer I likely want to hear.
[/O.T.]

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srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-22 08:48 +0000
  Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-22 06:44 -0500
    Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 13:18 +0100
      Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-22 12:13 -0500
        Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 18:41 +0100
          Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-22 20:45 +0200
            Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-22 21:16 +0000
            Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:19 +0100
            Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:57 +0100
              Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-23 11:18 +0200
                Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-23 10:54 +0100
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-23 13:50 +0200
                Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-23 18:29 -0500
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 16:30 -0800
            Re: srand(0) antispam@fricas.org (Waldek Hebisch) - 2025-12-23 17:54 +0000
              Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 00:08 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 02:02 +0000
                Re: srand(0) James Kuyper <jameskuyper@alumni.caltech.edu> - 2025-12-23 23:43 -0500
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 05:34 +0000
                Re: srand(0) antispam@fricas.org (Waldek Hebisch) - 2025-12-24 09:00 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 12:12 +0200
                Article of Melissa O'Nail (Was: srand(0)) Michael S <already5chosen@yahoo.com> - 2025-12-28 02:44 +0200
                Re: Article of Melissa O'Nail antispam@fricas.org (Waldek Hebisch) - 2025-12-28 05:38 +0000
                Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2025-12-28 12:35 +0200
                Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2026-01-05 14:21 +0200
                Re: Article of Melissa O'Nail antispam@fricas.org (Waldek Hebisch) - 2026-01-07 10:51 +0000
                Re: Article of Melissa O'Nail Michael S <already5chosen@yahoo.com> - 2026-01-08 14:03 +0200
                Re: Article of Melissa O'Nail Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-08 09:40 -0800
                Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-08 09:26 -0800
                Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-24 13:48 -0800
                Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 08:41 -0800
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-08 01:06 +0200
                Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-02-03 05:26 -0800
              Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 05:22 -0600
                Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 23:09 -0600
                Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 09:51 +0100
                Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 04:24 -0600
              Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:50 -0800
            Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:46 -0800
              Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-07 18:14 +0200
          Re: srand(0) Kaz Kylheku <046-301-5902@kylheku.com> - 2025-12-22 19:16 +0000
            Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-22 22:35 +0100
      Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:24 +0000
        Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-23 09:59 +0100
          Re: srand(0) Michael Bäuerle <michael.baeuerle@stz-e.de> - 2025-12-23 11:09 +0100
            Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:49 +0000
          Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-23 16:13 +0000
            Re: srand(0) richard@cogsci.ed.ac.uk (Richard Tobin) - 2025-12-23 19:05 +0000
        Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-23 02:16 -0800
          Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:47 +0000
        Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-23 16:08 +0000
          Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:44 +0000
    Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:17 +0000
      Re: srand(0) David Brown <david.brown@hesbynett.no> - 2025-12-23 08:25 +0100
        Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:45 +0000
          Re: srand(0) David Brown <david.brown@hesbynett.no> - 2025-12-23 19:15 +0100
  Re: srand(0) John McCue <jmclnx@gmail.com.invalid> - 2025-12-23 00:39 +0000
    Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-23 02:17 +0000
      Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 14:55 +0000
        Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-24 23:35 -0600
          Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:23 +0000
            Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 14:48 -0600
              Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 15:12 -0600
    Re: srand(0) Ike Naar <ike@sdf.org> - 2025-12-23 06:49 +0000
      Re: srand(0) John McCue <jmclnx@gmail.com.invalid> - 2025-12-23 20:37 +0000
        Re: srand(0) Ike Naar <ike@sdf.org> - 2025-12-24 15:22 +0000
    Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-23 07:25 +0000
      Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 06:16 +0000
        Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:21 +0000
          Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-24 19:00 +0000
            Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 03:07 -0600
              Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-25 19:31 +0000
                Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 21:14 +0100
                Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 15:29 -0600
                Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-25 23:25 -0500
                Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-25 23:41 -0600
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-26 05:42 +0000
                Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-26 01:52 -0500
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-26 07:56 +0000
                Re: srand(0) BGB <cr88192@gmail.com> - 2025-12-26 04:48 -0600
      Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 10:51 +0200
        Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-24 00:59 -0800
        Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:28 +0000
          Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 17:44 +0200
            Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 16:17 +0000
              Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-24 17:53 +0100
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 17:27 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 17:33 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-24 20:16 +0200
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 02:01 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-25 03:17 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:13 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 04:30 +0000
                Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-25 09:10 +0100
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-26 08:08 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-30 06:07 +0000
                Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-30 18:42 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 02:01 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 03:10 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 03:28 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 09:37 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 07:32 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 19:02 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 19:20 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-01 21:53 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 23:50 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-02 14:32 +0200
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-02 16:18 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-02 20:52 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-02 20:46 +0000
                Re: srand(0) Mike Terry <news.dead.person.stones@darjeeling.plus.com> - 2026-01-03 04:08 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-03 04:39 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-03 14:24 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-03 20:38 +0200
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-30 19:37 -0800
                Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-31 17:24 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:17 -0800
                Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-31 12:30 -0500
                Re: srand(0) bart <bc@freeuk.com> - 2025-12-31 18:42 +0000
                Re: srand(0) Paul <nospam@needed.invalid> - 2025-12-31 15:07 -0500
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 22:18 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:55 +0000
                Re: srand(0) bart <bc@freeuk.com> - 2025-12-31 22:57 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:00 -0800
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 01:03 +0000
                Re: srand(0) bart <bc@freeuk.com> - 2026-01-01 14:05 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 19:03 +0000
                Re: srand(0) bart <bc@freeuk.com> - 2026-01-01 20:28 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:29 -0800
                Re: srand(0) highcrew <high.crew3868@fastmail.com> - 2026-01-01 00:31 +0100
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:05 -0800
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 15:29 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:52 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:14 -0800
                Re: srand(0) Geoff <geoff@invalid.invalid> - 2026-01-05 20:00 -0800
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:03 -0800
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-30 19:35 -0800
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-31 04:51 +0000
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2025-12-31 15:15 +0200
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-31 20:51 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 15:00 -0800
                Re: srand(0) Michael S <already5chosen@yahoo.com> - 2026-01-01 01:45 +0200
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2025-12-31 16:34 -0800
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-01 07:23 +0000
                Re: srand(0) Mike Terry <news.dead.person.stones@darjeeling.plus.com> - 2026-01-01 02:01 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2026-01-01 02:29 +0000
                Re: srand(0) Lawrence D’Oliveiro <ldo@nz.invalid> - 2025-12-30 06:34 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-30 14:05 +0000
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-28 05:51 +0000
            Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2025-12-24 17:08 +0000
    Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-07 07:39 -0800
      Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-07 13:54 -0800
        Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-08 15:34 +0000
          Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-08 14:44 -0800
            Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-09 06:06 +0000
              Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-08 22:46 -0800
                Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-09 22:38 +0000
                Re: srand(0) scott@slp53.sl.home (Scott Lurndal) - 2026-01-09 23:27 +0000
                Re: srand(0) Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2026-01-09 17:09 -0800
                Re: srand(0) Kaz Kylheku <046-301-5902@kylheku.com> - 2026-01-10 19:44 +0000
        Re: srand(0) Tim Rentsch <tr.17687@z991.linuxsc.com> - 2026-01-09 00:36 -0800
  Re: srand(0) Bonita Montero <Bonita.Montero@gmail.com> - 2025-12-23 11:04 +0100
  Re: srand(0) "Chris M. Thomasson" <chris.m.thomasson.1@gmail.com> - 2025-12-23 21:44 -0800
    Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-24 15:41 +0000
      Re: srand(0) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2025-12-24 18:04 +0100
        Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2025-12-25 05:41 +0000
  Re: srand(0) Michael Sanders <porkchop@invalid.foo> - 2026-01-08 02:57 +0000

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