regex.m4: correct the reversed range endpoint ([b-a]) test

[gnulib.git] / lib / localcharset.c

diff --git a/lib/localcharset.c b/lib/localcharset.c
index c8873b5..26a2b03 100644 (file)
--- a/lib/localcharset.c
+++ b/lib/localcharset.c
@@ -1,6 +1,6 @@
 /* Determine a canonical name for the current locale's character encoding.
 
-   Copyright (C) 2000-2006, 2008-2009 Free Software Foundation, Inc.
+   Copyright (C) 2000-2006, 2008-2010 Free Software Foundation, Inc.
 
    This program is free software; you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
@@ -369,7 +369,7 @@ locale_charset (void)
   codeset = nl_langinfo (CODESET);
 
 #  ifdef __CYGWIN__
-  /* Cygwin 2006 does not have locales.  nl_langinfo (CODESET) always
+  /* Cygwin 1.5.x does not have locales.  nl_langinfo (CODESET) always
      returns "US-ASCII".  As long as this is not fixed, return the suffix
      of the locale name from the environment variables (if present) or
      the codepage as a number.  */
@@ -409,7 +409,17 @@ locale_charset (void)
             }
         }
 
-      /* Woe32 has a function returning the locale's codepage as a number.  */
+      /* Woe32 has a function returning the locale's codepage as a number:
+         GetACP().  This encoding is used by Cygwin, unless the user has set
+         the environment variable CYGWIN=codepage:oem (which very few people
+         do).
+         Output directed to console windows needs to be converted (to
+         GetOEMCP() if the console is using a raster font, or to
+         GetConsoleOutputCP() if it is using a TrueType font).  Cygwin does
+         this conversion transparently (see winsup/cygwin/fhandler_console.cc),
+         converting to GetConsoleOutputCP().  This leads to correct results,
+         except when SetConsoleOutputCP has been called and a raster font is
+         in use.  */
       sprintf (buf, "CP%u", GetACP ());
       codeset = buf;
     }
@@ -449,7 +459,13 @@ locale_charset (void)
 
   static char buf[2 + 10 + 1];
 
-  /* Woe32 has a function returning the locale's codepage as a number.  */
+  /* Woe32 has a function returning the locale's codepage as a number:
+     GetACP().
+     When the output goes to a console window, it needs to be provided in
+     GetOEMCP() encoding if the console is using a raster font, or in
+     GetConsoleOutputCP() encoding if it is using a TrueType font.
+     But in GUI programs and for output sent to files and pipes, GetACP()
+     encoding is the best bet.  */
   sprintf (buf, "CP%u", GetACP ());
   codeset = buf;