Re: Making more of the C standard library mandatory for freestanding implementations

From	Philipp Klaus Krause <pkk@spth.de>
Newsgroups	comp.std.c
Subject	Re: Making more of the C standard library mandatory for freestanding implementations
Date	2020-05-08 21:30 +0200
Organization	solani.org
Message-ID	<r94c03$cj2$2@solani.org> (permalink)
References	(8 earlier) <r90g5b$d34$1@solani.org> <hhj6fkFo22dU1@mid.dfncis.de> <r91of6$ds7$1@solani.org> <878si3bjwe.fsf@nightsong.com> <86blmyzbbt.fsf@linuxsc.com>

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Am 08.05.20 um 17:38 schrieb Tim Rentsch:
> 
> For example, under this scheme, we might do this:
> 
>     // File "fs_string.h"    
> 
>     #include <string-optional.h>   // string.h optional subset
> 
>     #if ! _Provides_strlen
>     extern size_t strlen( const char * );
>     #endif
> 
>     ...
> 
>     // File "fs_string.c"
> 
>     #include "fs_string.h"
> 
>     #if ! _Provides_strlen
>     size_t
>     strlen( const char *s ){
>         size_t r = 0;
>         while(  *s++  )  r++;
>         return  r;
>     }
> 
>     #endif
> 
> Now the rest of the program can simply #include "fs_string.h",
> and use strlen() just as it would if strlen() was supplied
> by the implementation.
> 

But this example also shows that it is relatively easy to implement
strlen(), so there is not much burden on implementations when requiring
them to provide it. And it shows that strlen not being mandatory for
freestanding implementations results in lots of duplicated code in
software projects that target these implementations.

Thread

Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-06 18:19 +0200
  Re: Making more of the C standard library mandatory for freestanding implementations Grant Edwards <invalid@invalid.invalid> - 2020-05-06 16:47 +0000
    Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-06 19:16 +0200
      Re: Making more of the C standard library mandatory for freestanding implementations Grant Edwards <invalid@invalid.invalid> - 2020-05-06 18:10 +0000
        Re: Making more of the C standard library mandatory for freestanding implementations James Kuyper <jameskuyper@alumni.caltech.edu> - 2020-05-06 15:10 -0400
          Re: Making more of the C standard library mandatory for freestanding implementations Richard Damon <Richard@Damon-Family.org> - 2020-05-06 16:08 -0400
            Re: Making more of the C standard library mandatory for freestanding implementations Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-05-06 13:22 -0700
              Re: Making more of the C standard library mandatory for freestanding implementations Richard Damon <Richard@Damon-Family.org> - 2020-05-06 22:29 -0400
                Re: Making more of the C standard library mandatory for freestanding implementations David Brown <david.brown@hesbynett.no> - 2020-05-07 15:43 +0200
              Re: Making more of the C standard library mandatory for freestanding implementations Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-07 06:08 -0700
            Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-06 22:36 +0200
              Re: Making more of the C standard library mandatory for freestanding implementations Grant Edwards <invalid@invalid.invalid> - 2020-05-06 20:57 +0000
              Re: Making more of the C standard library mandatory for freestanding implementations Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2020-05-06 23:25 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Grant Edwards <invalid@invalid.invalid> - 2020-05-06 21:34 +0000
                Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-07 10:17 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-05-07 18:45 +0300
                Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-07 10:16 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Hans-Bernhard Bröker <HBBroeker@t-online.de> - 2020-05-07 21:39 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-07 21:44 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Paul Rubin <no.email@nospam.invalid> - 2020-05-07 12:54 -0700
                Re: Making more of the C standard library mandatory for freestanding implementations Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-08 08:38 -0700
                Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-08 21:30 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-30 02:04 -0700
                Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-08-04 10:58 +0200
                Re: Making more of the C standard library mandatory for freestanding implementations Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2020-08-04 07:35 -0700
          Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-06 22:34 +0200
            Re: Making more of the C standard library mandatory for freestanding implementations upsidedown@downunder.com - 2020-05-07 09:13 +0300
            Re: Making more of the C standard library mandatory for freestanding implementations Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-05-07 18:47 +0300
              Re: Making more of the C standard library mandatory for freestanding implementations Grant Edwards <invalid@invalid.invalid> - 2020-05-07 15:51 +0000
                Re: Making more of the C standard library mandatory for freestanding implementations Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2020-05-08 10:09 +0300
    Re: Making more of the C standard library mandatory for freestanding implementations Florian Weimer <fw@deneb.enyo.de> - 2020-05-08 18:48 +0200
      Re: Making more of the C standard library mandatory for freestanding implementations Andrew Smallshaw <andrews@sdf.org> - 2020-05-08 17:01 +0000
        Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-08 20:05 +0200
  Re: Making more of the C standard library mandatory for freestanding implementations upsidedown@downunder.com - 2020-05-07 08:59 +0300
  Re: Making more of the C standard library mandatory for freestanding implementations Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-07 06:14 -0700
    Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-07 21:38 +0200
      Re: Making more of the C standard library mandatory for freestanding implementations Tim Rentsch <tr.17687@z991.linuxsc.com> - 2020-05-08 12:03 -0700
        Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-08 21:15 +0200
        Re: Making more of the C standard library mandatory for freestanding implementations Philipp Klaus Krause <pkk@spth.de> - 2020-05-08 21:27 +0200
          Re: Making more of the C standard library mandatory for freestanding implementations Jakob Bohm <jb-usenet@wisemo.com.invalid> - 2020-05-15 15:13 +0200
        Re: Making more of the C standard library mandatory for freestanding implementations David Brown <david.brown@hesbynett.no> - 2020-05-09 00:25 +0200

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