Re: [PATCH] localedata: Make IBM273 compatible with ISO-8859-1 [BZ #23290]

[Carlos O'Donell <carlos at redhat dot com>]

On 06/14/2018 03:11 PM, Florian Weimer wrote:
> 2018-06-14  Florian Weimer  <fweimer@redhat.com>
> 
> 	[BZ #23290]
> 	* localedata/charmaps/IBM273: Map codepoint 0xbc to U+00AF, so
> 	that the result stays within the ISO-8859-1 range.
> 	* iconvdata/ibm273.c (HAS_HOLES): Define as 0 because all 256
> 	characters are defined in IBM273.
OK with s/OVERLINE/MACRON/g in the charmap.

I reviewed:
ftp://ftp.software.ibm.com/software/globalization/gcoc/attachments/CP00273.pdf
just to see if macron/overline was expected and it was. I expect what you see
there, being slightly narrower than fullwidth, is a macron.

My review shows that the *intent* of IBM273 was to stay within Latin1, and
using "OVERLINE" <U203E> goes against that intent when MACRON is fine.

Reviewed-by: Carlos O'Donell <carlos@redhat.com>

> diff --git a/iconvdata/ibm273.c b/iconvdata/ibm273.c
> index c303cf306d..132c06f0eb 100644
> --- a/iconvdata/ibm273.c
> +++ b/iconvdata/ibm273.c
> @@ -23,6 +23,6 @@
>  #define TABLES <ibm273.h>
>  
>  #define CHARSET_NAME	"IBM273//"
> -#define HAS_HOLES	1	/* Not all 256 character are defined.  */
> +#define HAS_HOLES	0
>  
>  #include <8bit-gap.c>
> diff --git a/localedata/charmaps/IBM273 b/localedata/charmaps/IBM273
> index c3f70e2a6f..233d0db57d 100644
> --- a/localedata/charmaps/IBM273
> +++ b/localedata/charmaps/IBM273
> @@ -194,7 +194,7 @@ CHARMAP
>  <U00BE>     /xb9         VULGAR FRACTION THREE QUARTERS
>  <U00AC>     /xba         NOT SIGN
>  <U007C>     /xbb         VERTICAL LINE
> -<U203E>     /xbc         OVERLINE
> +<U00AF>     /xbc         OVERLINE

This is no longer OVERLINE but MACRON, which is in theory
slightly narrower, but still fits the description of the
codepage.

>  <U00A8>     /xbd         DIAERESIS
>  <U00B4>     /xbe         ACUTE ACCENT
>  <U00D7>     /xbf         MULTIPLICATION SIGN
> 

c.