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From: Tim Rentsch <tr.17687@z991.linuxsc.com>
Newsgroups: comp.std.c
Subject: Re: Making more of the C standard library mandatory for freestanding implementations
Date: Sat, 30 May 2020 02:04:00 -0700
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Philipp Klaus Krause <pkk@spth.de> writes:

> 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.

You already gave these arguments.  They weren't convincing
before, and repeating them doesn't make them any more
convincing.