From 7f6ade6be080fc01a45bf8c02d0e034c14b21035 Mon Sep 17 00:00:00 2001
From: Kovid Goyal <kovid@kovidgoyal.net>
Date: Mon, 6 Jun 2016 16:04:28 +0530
Subject: [PATCH] Function to get number formatting characters on windows

---
 src/calibre/constants.py | 23 +++++++++++++++++++++++
 1 file changed, 23 insertions(+)

diff --git a/src/calibre/constants.py b/src/calibre/constants.py
index dc00e56def..414f75a62c 100644
--- a/src/calibre/constants.py
+++ b/src/calibre/constants.py
@@ -308,3 +308,26 @@ def get_windows_user_locale_name():
         return None
     return u'_'.join(buf.value.split(u'-')[:2])
 
+number_formats = None
+
+def get_windows_number_formats():
+    global number_formats
+    if number_formats is None:
+        import ctypes
+        from ctypes.wintypes import DWORD
+        k32 = ctypes.windll.kernel32
+        n = 25
+        buf = ctypes.create_unicode_buffer(u'\0'*n)
+        k32.GetNumberFormatEx.argtypes = [ctypes.c_wchar_p, DWORD, ctypes.c_wchar_p, ctypes.c_void_p, ctypes.c_wchar_p, ctypes.c_int]
+        if k32.GetNumberFormatEx(None, 0, u'123456.7', None, buf, n) == 0:
+            raise ctypes.WinError()
+        src = buf.value
+        thousands_sep, decimal_point = u',.'
+        idx = src.find(u'3')
+        if idx > -1 and src[idx+1] != u'4':
+            thousands_sep = src[idx+1]
+        idx = src.find(u'6')
+        if idx > -1 and src[idx+1] != u'7':
+            decimal_point = src[idx+1]
+        number_formats = (thousands_sep, decimal_point)
+    return number_formats