[postgis-users] Re: [Plr-general] Tutorial on PLR and PostGIS, more on carriage returns

[Stephen Woodbridge]

Hmmmm, I am probably wrong on this but I thought 0x0 - 0x7f are standard 
UTF8 characters with a constant meaning that is the same as ascii for 
those bytes, and the all multi-byte characters had to have a the 
highorder bit set to indicate is was part of a multibyte sequence.

I was not under the impresion that at you could have 0x0 - 0x7f as a 
part of a multi-byte sequence. I am not an expert in this area and 
probably just know enough to mislead you ;) but I think it is worthwhile 
getting some additional inside into this. I for one would like to see a 
multi-byte UTF8 sequence with \r embedded in it.

-Steve


Paul Ramsey wrote:
> Danger, will Robinson.  All values are fair game in bytes 2,3,4 of the 
> UTF encodings, so yes, it's possible you'll wreck multi-byte characters 
> by doing a simple replacement on the byte array.  Better to use an 
> encoding-aware string replace function (not knowing C, I don't know what 
> that would be, but there must be some in the PgSQL code base).
> 
> P
> 
> On 21-Jun-07, at 7:03 AM, Joe Conway wrote:
> 
>> Obe, Regina wrote:
>>> Joe,
>>>  Can you take a look at it again.  It was messed up in my firefox 
>>> too.  I think originally I had it looking right in Firefox, but then 
>>> IE it didn't look right so I changed it to look right in IE, but 
>>> forgot to check back in firefox.  Hopefully this time I have made all 
>>> browser masters happy.
>>
>> http://www.bostongis.com/PrinterFriendly.aspx?content_name=postgresql_plr_tut02 
>>
>> The tutorial looks perfect now in Firefox on Fedora Core 7.
>>
>> BTW, I have confirmed on the R-devel list that the R engine is 
>> expecting \n for EOL, and \r will cause a syntax error, on all 
>> platforms. I will probably fix this by simply replacing \r with \n in 
>> PL/R functions. My only reservation is whether this might cause issues 
>> for installations with multibyte characters. Does anyone know if it is 
>> possible for multibyte characters to include a byte = 13 (\r), i.e. is 
>> the simple replacement of \r safe in all locales?
>>
>> Thanks,
>>
>> Joe
>>
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