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To: =?UTF-8?B?THVkb3ZpYyBDb3VydMOocw==?= <ludovic.courtes@laas.fr>
CC: libc-locales@sources.redhat.com
Subject: Re: Weird case-insensitive collation
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Ludovic Courtès yazmış:
> Hi,
> 
> `strcasecmp ()' behaves wrongly under the `fr_FR' locale.  Consider the
> following example program:
> 
>   #include <stdlib.h>
>   #include <stdio.h>
>   #include <locale.h>
>   #include <strings.h>
> 
>   int
>   main (int argc, char *argv[])
>   {
>     int result;
> 
>     if (!setlocale (LC_ALL, "fr_FR.ISO-8859-1"))
>       abort ();
> 
>     result = strcasecmp ("été", "Hiver");
>     printf ("result=%i\n", result);
> 
>     return (result < 0) ? 0 : 1;
>   }
> 
> Under French collation conventions, letter `é' (`e' with acute) comes
> before `h'.  Thus, the word "été" should be "lower than" the word
> "hiver".  `strcoll ()' returns the right answer (a negative number) but
> `strcasecmp ()' wrongfully returns a positive number, regardless of
> whether "hiver" is spelt with a capital `H' or not.
> 
> Is this a bug or am I missing something?
> 
> Thanks,
> Ludovic.
> 
I think this function is not locale-aware, so it compares characters'
integral value, which naturally produces a positive.
http://opengroup.org/onlinepubs/007908799/xsh/strcasecmp.html
In the POSIX locale, strcasecmp() and strncasecmp() do upper to lower
conversions, then a byte comparison. The results are unspecified in
other locales.

Since is 0xe9, and being an Extended ASCII character greater than both h
(0x68) and H (0x48), this doesn't seem to be a bug to me.

HTH,
Reshat.

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