[Cfp-interest 1504] Re: AI item to submit proposal about why no wide string strfrom functions

[Mike Cowlishaw]

Rajan, apologies for not being more clear.
 
I did not mean to imply that wide string functions were not useful/used.  I
use them often (although, I admit, mostly in test code, not in my primary
applications)!
 
I was just pointing out that the strfromd (etc.) functions are not widely
used (if at all .. google finds none on simple search) .. and it seems the
implementations of them that exist don't follow the C Standard anyway.
Therefore, perhaps there is indeed 'no point' in this proposal and we should
gracefully withdraw it.
 
Mike


  _____  

From: Rajan Bhakta [mailto:rbhakta at us.ibm.com] 
Sent: 19 February 2020 20:03
To: Mike Cowlishaw
Cc: 'CFP'
Subject: RE: [Cfp-interest 1496] Re: AI item to submit proposal about why no
wide string strfrom functions


Hi Mike,

I would probably not go that route since we proposed adding this example in
the first place to WG14 (i.e. No one asked us to do so, we brought it up due
to a CFP discussion). If, after asking WG14 to bless us adding this, we then
say there is no point, I'd wonder why we asked in the first place.

With regards to your specific point about wide string functions not being
widely used, I agree they are not widely used, but they are used and there
have been requests by two separate WG14 members to add in versions of wide
string functions to other (unrelated to floating point) proposals so I think
it is good we do mention them.

Regards,

Rajan Bhakta
z/OS XL C/C++ Compiler Technical Architect
ISO C Standards Representative for Canada, PL22.11 Chair (USA)
C Compiler Development
Contact: rbhakta at us.ibm.com, Rajan Bhakta/Houston/IBM



From:        "Mike Cowlishaw" <mfc at speleotrove.com>
To:        "'Rajan Bhakta'" <rbhakta at us.ibm.com>
Cc:        "'CFP'" <cfp-interest at ucbtest.org>
Date:        02/19/2020 01:11 PM
Subject:        [EXTERNAL] RE: [Cfp-interest 1496] Re: AI item to submit
proposal about why no        wide string strfrom functions

  _____  




Touché :-).
 
So therefore, perhaps, it would be better to say 'we don't have wide
strfromd functions' because they are neither widely used nor implemented
consistently (I'd never heard of them before this discussion) and it is
clearer and more likely to be understood if the programmer simply uses
strnprintf ...?
 
Mike
 


  _____  

From: Rajan Bhakta [ <mailto:rbhakta at us.ibm.com> mailto:rbhakta at us.ibm.com] 
Sent: 19 February 2020 18:16
To: Mike Cowlishaw
Cc: 'CFP'
Subject: Re: [Cfp-interest 1496] Re: AI item to submit proposal about why no
wide string strfrom functions

Hi Mike,

I think the point of the example was explicitly to say why we don't have
wide strfromd functions, so it really makes sense to keep strfromd there.

Regards,

Rajan Bhakta
z/OS XL C/C++ Compiler Technical Architect
ISO C Standards Representative for Canada, PL22.11 Chair (USA)
C Compiler Development
Contact: rbhakta at us.ibm.com, Rajan Bhakta/Houston/IBM



From:        "Mike Cowlishaw" <mfc at speleotrove.com>
To:        "'CFP'" <cfp-interest at ucbtest.org>
Date:        02/19/2020 11:49 AM
Subject:        [EXTERNAL] [Cfp-interest 1496] Re: AI item to submit
proposal about why no        wide string strfrom functions
Sent by:        cfp-interest-bounces at oakapple.net

  _____  




Hmm, given the uncertainty about 
int nc = strfromd(s, n, “%g”, d);
... perhaps just change that line to use snprintf, which has 'well-known'
behaviour?
Mike



  _____  

From: cfp-interest-bounces at oakapple.net [
<mailto:cfp-interest-bounces at oakapple.net>
mailto:cfp-interest-bounces at oakapple.net] On Behalf Of Jim Thomas
Sent: 05 February 2020 20:11
To: Damian McGuckin
Cc: CFP
Subject: [Cfp-interest 1468] Re: AI item to submit proposal about why no
wide string strfrom functions

Here’s an update for the code segment: 

#include <stdlib.h>
const size_t n = 20;
double d;


// convert d to single-byte character string s
char s[n];
int nc = strfromd(s, n, “%g”, d);
// convert s (regarded as a multi-byte character 
// string) to wide string ws
wchar_t ws[n];
(void)mbstowcs(ws, s, n);

On Feb 5, 2020, at 9:55 AM, Jim Thomas < <mailto:jaswthomas at sbcglobal.net>
jaswthomas at sbcglobal.net> wrote:

Probably so. the other code examples in the C standard include all the
declarations. Update to follow.

- Jim

On Feb 4, 2020, at 4:04 PM, Damian McGuckin < <mailto:damianm at esi.com.au>
damianm at esi.com.au> wrote:

On Tue, 4 Feb 2020, Jim Thomas wrote:

Action item:
      Jim: Get a WG14 document number and submit
  C2x_proposal_-_why_no_wide_string_strfrom_functions-
  20191230.pdf.
The following was submitted to WG14:
 <http://wiki.edg.com/pub/CFP/WebHome/n2475.pdf>
http://wiki.edg.com/pub/CFP/WebHome/n2475.pdf

Do you need a declaration for the wide string 'ws' in that code at the end?

Regards - Damian

Pacific Engineering Systems International, 277-279 Broadway, Glebe NSW 2037
Ph:+61-2-8571-0847 .. Fx:+61-2-9692-9623 | unsolicited email not wanted here
Views & opinions here are mine and not those of any past or present employer


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