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From: Ken Brown <kbrown@cornell.edu>
Subject: Bug in collation functions?
Message-ID: <563148AF.1000502@cornell.edu>
Date: Wed, 28 Oct 2015 18:14:07 -0400
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It's my understanding that collation is supposed to take whitespace and 
punctuation into account in the POSIX locale but not in other locales. 
This doesn't seem to be the case on Cygwin.  Here's a test case using 
wcscoll, but the same problem occurs with strcoll.

$ cat wcscoll_test.c
#include <wchar.h>
#include <stdio.h>
#include <locale.h>

void
compare (const wchar_t *a, const wchar_t *b, const char *loc)
{
   setlocale (LC_COLLATE, loc);
   char res = wcscoll (a, b) < 0 ? '<' : '>';
   printf ("\"%ls\" %c \"%ls\" in %s locale\n", a, res, b, loc);
}

int
main ()
{
   compare (L"11", L"1.1", "POSIX");
   compare (L"11", L"1.1", "en_US.UTF-8");
   compare (L"11", L"1 2", "POSIX");
   compare (L"11", L"1 2", "en_US.UTF-8");
}

$ gcc wcscoll_test.c -o wcscoll_test

$ ./wcscoll_test
"11" > "1.1" in POSIX locale
"11" > "1.1" in en_US.UTF-8 locale
"11" > "1 2" in POSIX locale
"11" > "1 2" in en_US.UTF-8 locale

On Linux, the output from the same program is

"11" > "1.1" in POSIX locale
"11" < "1.1" in en_US.UTF-8 locale
"11" > "1 2" in POSIX locale
"11" < "1 2" in en_US.UTF-8 locale

Ken

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