Re: code for 32/64 bit strtoul strtol strtoull strtoll

From	Bartc <bc@freeuk.com>
Newsgroups	comp.lang.c
Subject	Re: code for 32/64 bit strtoul strtol strtoull strtoll
Date	2015-03-31 20:26 +0100
Organization	A noiseless patient Spider
Message-ID	<mfesbm$3c3$1@dont-email.me> (permalink)
References	(3 earlier) <afgkhad77likbtrl59abp4gicrighrb2e9@4ax.com> <mfe28k$ks4$1@dont-email.me> <877ftxjjfr.fsf@kst-u.example.com> <mfefr3$bis$1@dont-email.me> <mfen05$b4f$1@speranza.aioe.org>

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On 31/03/2015 18:54, glen herrmannsfeldt wrote:
> Bartc <bc@freeuk.com> wrote:
>
> (snip)
>
>> I meant 2, 8, 10 and 16, which are in the range 2 to 16. Although I did
>> make use of base 4 the other week (meaning I use base 4 more than base 8).
>
> There is a lot of work done in base 4, if you use A, C, T, and G
> instead of 0, 1, 2, 3 for the digits.

Being able to read or print int values from or to a quaternary text 
representation is useful, but what is more apt is an actual packed bit 
or 2-bit type especially when you need a lot of such digits as you would 
for ACGT sequences.

(As it happens, I have a language that allows exactly that. A 400M array 
of 2-bit values occupies 100MB, and when printed looks like: 
(3,1,1,0,2,2,...) with values in base 10!)

However, my use of it was like you suggest, to easily represent 2-bit 
data within a normal int constant, something like this:

((4x32323_32323_030 >> (x*2)) & 3) + 28

(which converts month x, 1 to 12, into the number of days in the month, 
excluding leap years. The 3, 2, 0 digits are deviations from 28 days.)

This would be a harmless little extension to any language including C, 
and has virtually zero implementation cost.

(Bit types, in the form of bit-arrays and bit-pointers, are also useful, 
but are not such a trivial addition to the language.)

-- 
Bartc

Thread

code for 32/64 bit strtoul strtol strtoull strtoll jacob navia <jacob@jacob.remcomp.fr> - 2015-03-29 17:33 +0200
  code for 32/64 bit strtoul strtol strtoull strtoll asetofsymbols@gmail.com - 2015-03-29 09:22 -0700
    Re: code for 32/64 bit strtoul strtol strtoull strtoll Barry Schwarz <schwarzb@dqel.com> - 2015-03-29 15:12 -0700
      Re: code for 32/64 bit strtoul strtol strtoull strtoll asetofsymbols@gmail.com - 2015-03-29 23:07 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Barry Schwarz <schwarzb@dqel.com> - 2015-03-29 09:44 -0700
    Re: code for 32/64 bit strtoul strtol strtoull strtoll jacob navia <jacob@jacob.remcomp.fr> - 2015-03-29 19:05 +0200
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-29 12:15 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-03-30 02:01 +0100
    Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-29 19:48 -0700
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Barry Schwarz <schwarzb@dqel.com> - 2015-03-29 22:08 -0700
        Re: code for 32/64 bit strtoul strtol strtoull strtoll Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-03-30 12:44 +0100
          Re: code for 32/64 bit strtoul strtol strtoull strtoll Barry Schwarz <schwarzb@dqel.com> - 2015-03-30 09:04 -0700
            Re: code for 32/64 bit strtoul strtol strtoull strtoll Ben Bacarisse <ben.usenet@bsb.me.uk> - 2015-03-30 21:00 +0100
        Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-30 08:24 -0700
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-30 07:21 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Ian Collins <ian-news@hotmail.com> - 2015-03-30 18:02 +1300
    Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-03-30 08:03 +0100
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Ian Collins <ian-news@hotmail.com> - 2015-03-30 20:33 +1300
        Re: code for 32/64 bit strtoul strtol strtoull strtoll Ian Collins <ian-news@hotmail.com> - 2015-03-30 20:35 +1300
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Tim Rentsch <txr@alumni.caltech.edu> - 2015-03-30 07:27 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-30 09:08 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-30 09:29 -0700
  Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-03-30 15:16 -0500
    Re: code for 32/64 bit strtoul strtol strtoull strtoll jacob navia <jacob@jacob.remcomp.fr> - 2015-03-31 00:15 +0200
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-03-31 01:42 -0500
    Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-03-30 23:39 +0100
      Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-03-31 01:44 -0500
        Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-03-31 13:01 +0100
          Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-31 05:13 -0700
          Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-31 08:06 -0700
            Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-31 08:26 -0700
            Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-03-31 16:40 +0100
              Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-31 09:39 -0700
              Re: code for 32/64 bit strtoul strtol strtoull strtoll Kaz Kylheku <kaz@kylheku.com> - 2015-03-31 18:22 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-03-31 19:36 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-31 12:11 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Kaz Kylheku <kaz@kylheku.com> - 2015-03-31 19:23 +0000
            Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-03-31 16:52 +0100
              Re: code for 32/64 bit strtoul strtol strtoull strtoll glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-31 17:54 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll raltbos@xs4all.nl (Richard Bos) - 2015-03-31 18:51 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-03-31 20:05 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll James Kuyper <jameskuyper@verizon.net> - 2015-03-31 15:18 -0400
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-03-31 20:49 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-31 13:06 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll raltbos@xs4all.nl (Richard Bos) - 2015-04-06 13:03 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-04-06 14:27 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-04-06 17:01 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-04-06 11:25 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll James Kuyper <jameskuyper@verizon.net> - 2015-04-06 23:34 -0400
                Re: code for 32/64 bit strtoul strtol strtoull strtoll glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-04-07 03:46 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll James Kuyper <jameskuyper@verizon.net> - 2015-04-08 11:05 -0400
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-04-08 08:31 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-03-31 19:54 +0000
                Re: code for 32/64 bit strtoul strtol strtoull strtoll James Kuyper <jameskuyper@verizon.net> - 2015-03-31 16:55 -0400
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-03-31 22:20 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-31 14:36 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-03-31 14:55 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-03-31 17:00 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-04-01 01:24 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll James Kuyper <jameskuyper@verizon.net> - 2015-03-31 23:33 -0400
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Richard Heathfield <rjh@cpax.org.uk> - 2015-04-01 04:42 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-03-31 20:26 +0100
            Re: code for 32/64 bit strtoul strtol strtoull strtoll Ian Collins <ian-news@hotmail.com> - 2015-04-01 10:33 +1300
              Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-04-01 04:33 -0500
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Bartc <bc@freeuk.com> - 2015-04-01 12:43 +0100
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-04-02 01:02 -0500
                Re: code for 32/64 bit strtoul strtol strtoull strtoll asetofsymbols@gmail.com - 2015-04-01 23:57 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-04-03 00:29 -0500
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Malcolm McLean <malcolm.mclean5@btinternet.com> - 2015-04-02 09:01 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Keith Thompson <kst-u@mib.org> - 2015-04-02 14:30 -0700
                Re: code for 32/64 bit strtoul strtol strtoull strtoll Robert Wessel <robertwessel2@yahoo.com> - 2015-04-03 00:39 -0500
                Re: code for 32/64 bit strtoul strtol strtoull strtoll glen herrmannsfeldt <gah@ugcs.caltech.edu> - 2015-04-01 15:55 +0000

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