Re: [PATCH][BZ #12986] Clarify that scanf does not use character classes.

[OndÅej BÃlka <neleai at seznam dot cz>]

On Fri, Oct 25, 2013 at 02:15:09PM -0700, Roland McGrath wrote:
> > 	[BZ #12986]
> > 	* manual/stdio.texi: Clarify documentation.
> 
> Such a vague log entry is wholly inadequate.  Log entries for Texinfo
> files should cite the node in the same way log entries for C files
> cite the function.  That alone is still insufficiently specific.
> Say what you're clarifying.
> 
> > diff --git a/manual/stdio.texi b/manual/stdio.texi
> > index 30630ca..1be5fd9 100644
> > --- a/manual/stdio.texi
> > +++ b/manual/stdio.texi
> > @@ -3671,8 +3671,8 @@ of the width or precision by @code{MB_CUR_MAX}.
> >  
> >  To read in characters that belong to an arbitrary set of your choice,
> >  use the @samp{%[} conversion.  You specify the set between the @samp{[}
> > -character and a following @samp{]} character, using the same syntax used
> > -in regular expressions.  As special cases:
> > +character and a following @samp{]} character, using similar syntax an one 
> > +used in regular expressions.  As special cases:
> 
> I'd say, "... using the same syntax used in regular expressions for
> explicit sets of characters."
> 
> > +Note that character classes are not supported.
> 
> The term "character class" is not defined anywhere in this manual
> (unsurprising since it does not document regexp syntax).  You could
> use a cross-reference to another manual that does document regexp
> syntax and define the term (there is surely a good node to refer to in
> the grep manual).  But it's also nice to make it clear without looking
> up the reference, e.g.
> 
> Note that the @dfn{character class} syntax available in character sets
> that appear inside regular expressions (such as @samp{[:alpha:]}) is
> @emph{not} available in the @samp{%[} conversion.

Here is v2.


	[BZ #12986]
	* manual/stdio.texi (String Input Conversions): Clarify that character
	classes are not supported.

diff --git a/manual/stdio.texi b/manual/stdio.texi
index 30630ca..7dcacd8 100644
--- a/manual/stdio.texi
+++ b/manual/stdio.texi
@@ -3672,7 +3672,7 @@ of the width or precision by @code{MB_CUR_MAX}.
 To read in characters that belong to an arbitrary set of your choice,
 use the @samp{%[} conversion.  You specify the set between the @samp{[}
 character and a following @samp{]} character, using the same syntax used
-in regular expressions.  As special cases:
+in regular expressions for explicit sets of characters.  As special cases:
 
 @itemize @bullet
 @item
@@ -3692,6 +3692,10 @@ the characters listed.
 The @samp{%[} conversion does not skip over initial whitespace
 characters.
 
+Note that the @dfn{character class} syntax available in character sets
+that appear inside regular expressions (such as @samp{[:alpha:]}) is
+@emph{not} available in the @samp{%[} conversion.
+
 Here are some examples of @samp{%[} conversions and what they mean:
 
 @table @samp